tank farm maintenance procedure calibration

Calibrate Eberline Model Alpha 5 and 5A Continuous Air Monitor Stack CAMs

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CONTINUOUS Document No.

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Tank Farm Maintenance Procedure CALIBRATION

Changes “Other Than Inconsequential” Require These Additional Reviews:

222-S Laboratory

USQ # N/A-4

CHANGE HISTORY ( LAST 5 REV-MODS )

Rev-Mod Release Date Justification: Summary of Changes

D-1 04/19/2017 Add step for clarification Step added after 5.2.3 to turn on the instrument.

D-0 03/16/2016 Periodic Review Incorporated changes found during the Periodic Review process.

C-2 10/21/2014 CHAMPS Removal CHAMPS removal, new records statement.

C-1 02/11/2013 DOE Standard Replaced references to document TFC-ESHQ-S-STD-03, Electrical

Safety with DOE–0359, Hanford Site Electrical Safety Program.

C-0 08/08/2012 Periodic Review Editorial and Formatting changes throughout procedure.

Table of Contents Page

1.0 PURPOSE AND SCOPE ................................................................................................................ 3

1.1 Purpose ................................................................................................................................ 3

1.2 Scope ................................................................................................................................... 3

2.0 INFORMATION............................................................................................................................. 3

2.1 General Information ............................................................................................................ 3

3.0 PRECAUTIONS AND LIMITATIONS......................................................................................... 3

3.1 Personnel Safety.................................................................................................................. 3

3.2 Radiation and Contamination Control ................................................................................ 4

3.3 Environmental Compliance ................................................................................................ 4

4.0 PREREQUISITES .......................................................................................................................... 5

4.1 Special Tools, Equipment, and Supplies............................................................................. 5

4.2 Field Preparation ................................................................................................................. 6

5.0 PROCEDURE ................................................................................................................................. 7

5.1 As-Found Readings ............................................................................................................. 7

5.2 Pulse Width ....................................................................................................................... 11

5.3 Preamp Linearity Check ................................................................................................... 12


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5.4 Output Relay Check/Failure Alarm Delay ........................................................................ 14

5.5 Preventive Maintenance .................................................................................................... 16

5.6 Calibration Set-Up ............................................................................................................ 17

5.7 Count Rate Meter Calibration ........................................................................................... 18

5.8 Alarm Point and Delay Check .......................................................................................... 20

5.9 Percent Subtraction ........................................................................................................... 21

5.10 Flowmeter Calibration ...................................................................................................... 23

5.11 Perform Leak Test............................................................................................................. 24

5.12 Signal Level ...................................................................................................................... 25

5.13 Operational Test ................................................................................................................ 27

5.14 Thorium on the Detector (by RadCon direction) .............................................................. 28

5.15 As Left-Readings (Alternate Energy Set-Up) ................................................................... 29

5.16 Restoration ........................................................................................................................ 30

5.17 Acceptance Criteria ........................................................................................................... 30

5.18 Review .............................................................................................................................. 30

5.19 Records ............................................................................................................................. 31

Figure 1 – Alpha-5 and 5A Preamp Component Assembly ..................................................................... 32

Figure 2 – Component Layout of PHA Board .......................................................................................... 33


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1.0 PURPOSE AND SCOPE

1.1 Purpose

To provide instruction for the safe, and proper method for calibrating and maintaining the

Eberline Models Alpha 5, and 5A Continuous Air Monitor Stack (CAMs).

1.2 Scope

The procedure is written for Bench Testing the Eberline Alpha Models 5 and 5A

Continuous Air Monitor Stack (CAMs) for the measurement of 239Pu in the Stacks.

2.0 INFORMATION

2.1 General Information

For units equipped with a chart recorder, all readings are taken from indications on the

chart paper, not the recorder scale, as the chart is the permanent record.

3.0 PRECAUTIONS AND LIMITATIONS

3.1 Personnel Safety

3.1.1 IF working around live circuits, extreme caution should be used. Failure to

follow electrical safety practices as outlined in DOE–0359 could result in

serious injury or death.

3.1.2 Lockouts, tagouts, or over-tagging requirements shall be performed in

accordance with DOE-0336, Hanford Site Lockout/Tagout Procedure, as

applicable.


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3.2 Radiation and Contamination Control

3.2.1 Work in radiological areas will be performed using a radiological work

permit following review by Radiological Control per the ALARA Work

Planning procedure TFC-ESHQ-RP_RWP-C-03.

3.2.2 Handle radioactive sources with extreme care; keep covered and protected at

all times when not in use.

3.3 Environmental Compliance

3.3.1 Breach of a radiologically contaminated ventilation system requires a pre-job

and post-job survey.

3.3.2 To ensure reporting requirements are met, all unplanned outages of

ventilation, including portable exhausters, and both planned and unplanned

outage of exhaust record samplers must be immediately reported to

environmental On-Call per the On-Call List in compliance with

TFC-ESHQ-ENV-FS-01.

3.3.3 Equipment with removable contamination and/or work with removable

contamination will be contained per the latest revision of the Containment

Selection guide, Attachment A, in TFC-ESHQ-RP-C-02.


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4.0 PREREQUISITES

4.1 Special Tools, Equipment, and Supplies

The following supplies may be needed to perform this procedure:

NOTE - All M&TE used shall be calibrated and traceable to NIST.

Oscilloscope, 4 MHZ minimum band width, Tol. 2% of measurement or better

Oscilloscope Probe

Test leads and cables as applicable

Two (2) Eberline Model MP-1 or MP-2 pulse generators or equivalent with

Tolerance of 2% of setting or better

Two (2) digital multimeters with Tol. of 0.5% of reading or better

Mass Flowmeter or rotameter with a tolerance of 2.5% of reading or better

Stop watch or timer

Appropriate hoses and adaptors

Vacuum pump or source

Filter Paper (Versapore-3000)

O-Rings, as needed and O-ring lubricant (Celvacene, Dow Corning 111 Release

Agent, or equivalent)

Tamper seal to glue recorder zero adjust lever in place

W. B. Johnson Scaler/Timer or equivalent.

NOTE - The following sources are applicable for use on the Eberline Alpha Air

Monitors listed in this procedure, and are identified as source specific on Data

Sheets. Based on source decay, duplicate sources listed may not be released by

Radiological Control.

- Sources are to be obtained from the Source Custodian (usually Health Physics

office). Sources are to be signed out and signed back in when returned at

completion of the task.

- A source with an activity of less than 500 dpm will not provide the statistical

level of confidence needed for a proper calibration.

4.1.1 National Institute of Standards and Technology (NIST) traceable sources of

the following types:

239Pu 47mm sources calibrated for alpha CAM geometry (calibration

sticker) with a current activity between 500 and 1500 dpm

239Pu 47mm sources calibrated for alpha CAM geometry (calibration

sticker) with a current activity between 5,000 and 15,000 dpm.


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4.2 Field Preparation

4.2.1 CHECK M&TE is within calibration.

4.2.2 REMOVE CAM from service.

4.2.3 IF the potential for radiological contamination exists, REQUEST equipment

survey prior to beginning maintenance.

4.2.4 REMOVE CAM AND TRANSPORT to shop for testing.


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5.0 PROCEDURE

Special Instructions The subsections within Section 5.0 may be worked as independent

activities as applicable. Any sections that are not required may be skipped with

concurrence of the field work supervisor and explained in comments section of Data

Sheet.

If performance of any steps in this procedure is not required for procedure completion,

steps not performed are to be marked, "N/A" in appropriate Data Sheet signoff space,

and explained in comments/remarks section of Data Sheet.

5.1 As-Found Readings

NOTE - If instrument has been disassembled for decontamination, detector As-Found

readings cannot be taken.

5.1.1 IF CAM has been disassembled for decontamination, CHECK “YES”;

OTHERWISE, CHECK “NO” on Data Sheet.

5.1.2 RECORD As-Found readings on Data Sheet for the following:

Window Setting

Threshold Setting

Mode Switch Setting

Mechanical Zero (Count Rate Meter)

5.1.3 PLUG IN AND TURN ON instrument.

NOTE - When “PUSH TO SET” alarm switch (S203) is pressed, the Alarm Setpoint is

displayed directly.

5.1.4 PRESS “PUSH TO SET” alarm switch (S203) AND

RECORD the As-Found Alarm Setpoint on Data Sheet.

5.1.5 CHECK light and bell are functional AND

RECORD results on Data Sheet.

5.1.6 TURN-OFF instrument AND

REMOVE the cover.

5.1.7 COVER sample lines to prevent potential higher counts due to ambient light.


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5.1 As-Found Readings (Cont.)

NOTE - If the CAM was in service in a low Radon area, a Thorium keep-alive source

(lantern Mantle) providing two (2) cpm to six (6) cpm, will likely be present on

the detector. Source may be temporarily removed to confirm absence of

contamination.

5.1.8 CONNECT Scaler/Timer to Continuous Air Monitor (CAM) to pin 4 of IC

A4 side of resistor R12 on the PHA board (Figure 2) AND

TURN ON power to the CAM.

5.1.9 TAKE a two (2) minute count AND

RECORD results as As-Found background count on Data Sheet.

5.1.10 IF the count is more than 10 CPM and there is no Lantern Mantle present on

detector, CLEAN the detector and/or housing.

5.1.11 RECORD the As-Left background count on Data Sheet.

5.1.12 INSERT a nominal 500 - 1500 dpm 239PU source in instrument sample

holder.

5.1.13 PERFORM an eight (8) minute count to determine counting efficiency (CE).

NOTE - Typical efficiency values are in the range of 9.0 to 13%. CPM equals total

counts divided by number of minutes in count.

5.1.14 CALCULATE AND RECORD As-Found efficiency (for 500 - 1500 dpm

source) on Data Sheet using equation below.

5.1.15 REMOVE the 500 - 1500 dpm source.

5.1.16 INSERT a nominal 5,000 - 15,000 dpm 239PU source in instrument sample

holder AND

REPEAT count in accordance with Steps 5.1.13 and 5.1.14.

5.1.16.1 RECORD the As-Found efficiency (for 5,000 - 15,000 dpm

source) on Data Sheet.


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5.1 As-Found Readings (Cont.)

NOTE - J-101, J-102 and rear BNC are same Test Point for the 11285-1 pre-amp board.

- Alpha 5A preamps have two BNC connectors on board back.

- Typical oscilloscope settings are 0.1 volt/div and 0.1 microsec/div.

5.1.17 CONNECT oscilloscope probe to J-101, preamp outlet.

5.1.18 CHECK Detector for maximum acceptable (Diode Detector) noise as

follows:

Up to 75 mV peak-to-peak is acceptable for Alpha 5 detector noise

Up to 100 mV peak-to peak is acceptable on Alpha 5A detector noise.

5.1.19 RECORD the As-Found noise level on Data Sheet.

5.1.20 IF As-Found Detector noise level is within acceptable limits, RECORD in

As-Left column on Data Sheet,

OR

IF As-Found Detector noise level is above acceptable limits given in

Step 5.1.18, REPLACE detector.

5.1.20.1 RECHECK readings after replacing detector AND

RECORD the As-Left noise level on Data Sheet.

NOTE - Typical oscilloscope settings are 200 mV/div and 5 sec/div.

5.1.21 MEASURE pulse amplitude on preamp board, signal Test Point J-101 AND

RECORD As-Found value on Data Sheet, see Figure 1.

NOTE - If desired, the power may be de-energized during removal of the noise shield.

5.1.22 REMOVE the nominal 10K dpm 239PU source from instrument sample

holder.

5.1.23 IF applicable, REMOVE the noise shield.


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5.1 As-Found Readings (Cont.

5.1.24 CONNECT pulser to the applicable Pre-amp Input (Figure 1) as follows:

On Alpha 5 preamps, connection is made at Test Point (TP).

On Alpha 5A preamps, connection is made at (either end of) capacitor

C103.

5.1.25 CONNECT DVM to zero (0) – 10 mV output across resistor.

5.1.26 SET CAM to gross.

5.1.27 ADJUST Alarm Set Point to maximum.

5.1.28 SET pulser to 1, 10, 100, 1000 and 10K counts per minute with pulser output

amplitude approximately one (1) to 10 mV.

5.1.28.1 ALLOW readings to stabilize.

5.1.28.2 OBSERVE AND RECORD the following As-Found values on

Data Sheet for each respective output given in Step 5.1.28:

Count Rate Meter reading(s)

Output millivolts (0 -10 mV).

5.1.29 IF pulse amplitude measured in Step 5.1.21 was within tolerance, GO TO

Step 5.1.33.

5.1.30 DISCONNECT pulser AND INSERT a 5,000 - 15,000 dpm 239Pu source in

instrument sample holder.

5.1.31 CONNECT oscilloscope probe to J-101 on preamp outlet (Figure 1).

5.1.32 ADJUST gain control on Preamp board (Figure 1) for pulse amplitude of

0.7 ± 0.1 volts for the particular model being tested as follows:

Adjustment made to potentiometer R-108 on model Alpha 5.

Adjustment made to potentiometer R-110 on model Alpha 5A.

5.1.33 RECORD As-Left results on Data Sheet AND

REMOVE 5,000 - 15,000 dpm source.


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5.2 Pulse Width

5.2.1 TURN OFF instrument AND

IF applicable, REMOVE the noise shield.

NOTE - Typical oscilloscope settings are 0.5 volts/div and 0.5 micro sec/div.

5.2.2 CONNECT oscilloscope positive lead to output of A5, (pin 8), (left side of

R-15) on PHA-Board, (Figure 2).

5.2.3 CONNECT a pulser to Pre-amp Input (Figure 1) as follows:

Connection made at Test Point (TP) on Alpha 5 preamp

Connection made at C103 on Alpha 5A preamp.

5.2.4 TURN ON instrument

5.2.5 SET pulser to between 5,000 - 15,000 cpm AND

ADJUST pulser amplitude to obtain between 5,000 - 15,000 cpm on

instrument.

5.2.6 RECORD As-Found pulse width (as measured by oscilloscope) on

Data Sheet.

5.2.7 IF value is within tolerance RECORD in As-Left section of Data Sheet

AND GO TO Section 5.3,

OR

IF values are not in tolerance, ADJUST pulse width control R-13, (Figure 2)

for a pulse width of 1.0 ± 0.1 micro-second as measured by oscilloscope

AND

RECORD As-Left results on Data Sheet.


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5.3 Preamp Linearity Check

5.3.1 SET pulser frequency to 100K cpm AND

ADJUST amplitude to 20 mV as indicated on pulser amplitude meter.

5.3.2 CONNECT oscilloscope at J101 or at rear BNC connector (Figure 1).

5.3.3 SET oscilloscope at 0.5 volt per centimeter scale (20 micro sec/div).

5.3.4 OBSERVE output (tail) amplitude on oscilloscope (desired 0.3 volts) AND

RECORD the As-Found reading on Data Sheet.

5.3.5 INCREASE pulser output to 40 mV.

5.3.6 SET oscilloscope at 0.2 volts/centimeter AND


5.3.7 IF pulse amplitude reading(s) recorded in Step 5.3.6 are not twice the value

recorded in Step 5.3.4, 20%, REPLACE preamp AND

REPEAT Steps 5.1.8 thru 5.3.7.

5.3.8 IF values are in limits, RECORD As-Left values on Data Sheet.

5.3.9 RECORD the As-Found values for the Preamp Card model number.

5.3.10 IF the Preamp is a model number 11145-C01, REPLACE it with a model

number, 5A (11285-01).

5.3.11 IF the Preamp is a model Alpha 5A, ENSURE capacitors C103 and C107

must be .01 and .001 microfarad (μF) respectively AND

IF not reading as specified, REPLACE them with the correct capacitive

values.


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5.3 Preamp Linearity Check (Cont.)

5.3.12 IF repairs/parts replacements were made, ENSURE an efficiency range of

8.5% by performing the following:

5.3.12.1 INSERT a 5,000 - 15,000 nominal dpm 239PU source in

instrument sample holder.

NOTE - Counts may be read from the meter or by connecting a scaler/timer

to A4, pin 4, right side of resistor R12 on the PHA board

(Figure 2).

5.3.12.2 PERFORM an 8 minute count to determine the counting

efficiency (CE).

NOTE - Typical efficiency values are in the range of 9.0 to 13%. CPM

equals total counts divided by number of minutes in count.

5.3.12.3 CALCULATE the efficiency (for 10K dpm source) using

equation below.

5.3.12.4 REMOVE 5,000 - 15,000 dpm source.

5.3.12.5 INSERT a nominal 500 - 1500 dpm 239PU source in instrument

sample holder AND

REPEAT count in accordance with Steps 5.3.12.2 and 5.3.12.3.

5.3.12.6 IF efficiency range is not 8.0 to 13%, NOTIFY FWS for

resolution.


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5.4 Output Relay Check/Failure Alarm Delay

5.4.1 WITH CAM counting and “Not In Alarm Condition”, USE multimeter(s) in

ohms position to make the following measurements on both the FAILURE

and ALARM relay output terminals.

Fail Relay

5.4.1.1 MEASURE the following AND

RECORD Pass/Fail As-Found results on Data Sheet.

Resistance between the common and normally open (NO)

terminals indicates open

Resistance between common and normally closed (NC)

terminals is less than 10 ohms.

Alarm Relay



Resistance between the common and NO terminals on

Alarm Relay is less than 10 ohms

Resistance between common and NC terminals on Alarm

Relay indicates open.


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5.4 Output Relay Check/Failure Alarm Delay (Cont.)

5.4.2 WITH CAM “In Alarm Condition”, USE multimeter(s) in ohms position to

make the following measurements:

Fail Relay



Resistance between the common and normally open (NO)

terminals indicates open

Resistance between common and normally closed (NC)

terminals is less than 10 ohms.

Alarm Relay



Resistance between the common and NO terminals on

Alarm Relay is less than 10 ohms

Resistance between common and NC terminals on Alarm

Relay indicates open.

NOTE - Detector is light sensitive and should be covered to prevent light interference.

5.4.3 WITH CAM counting in “In Alarm Condition”, SIMULTANEOUSLY

START Stopwatch and OPEN the sample chamber door (to cause

instrument to go into failure mode).

5.4.3.1 MONITOR relay AND CHECK the following:

Fail Relay goes to FAILURE mode

Fail light illuminates in failure mode (16 ± 5 minutes).

5.4.3.2 RECORD the As-Found results on Data Sheet.

5.4.4 IF As-Found results are in tolerance, RECORD in As-Left column.

5.4.5 IF As-Found results are not within tolerance, REPAIR the CAM.

5.4.5.1 REPEAT Steps 5.4.1 thru 5.4.3.1 AND

RECORD As-Left values on Data Sheet.


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5.5 Preventive Maintenance

5.5.1 PERFORM visual inspection of CAM interior and exterior AND

IF water or obvious damage is noticed, PERFORM applicable repairs.

5.5.2 REMOVE “O” rings from sample holder.

5.5.2.1 CLEAN AND LUBRICATE “O” ring.

NOTE - If “O” ring is replaced, it should fit snugly inside chamber.

5.5.3 IF “O” ring has signs of cracking, is excessively dirty, or does not fit snuggly

inside of the chamber, REPLACE it.

5.5.4 CLEAN detector and housing with alcohol.

5.5.5 CHECK door switch to verify proper operation, (i.e., when door is open,

detector bias voltage shall be off).

5.5.6 RECORD preventative maintenance status on Data Sheet.


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5.6 Calibration Set-Up

5.6.1 TURN Threshold Dial Counter-Clockwise until limit is reached AND

RECORD the As-Found Dial Counter Limit on Data Sheet.

5.6.2 IF As-Found limit is within tolerance (.86 ± .01 MeV), GO TO Step 5.6.4.

5.6.3 IF Threshold Dial Counter Limit is not .86 ± .01 MeV, PERFORM the

following:

5.6.3.1 LOOSEN set screw WITHOUT moving potentiometer shaft.

5.6.3.2 ADJUST counter offset to .86 ± .01 MeV AND

TIGHTEN set screw.

5.6.4 RECORD As-Left Threshold Dial Counter Limit on Data Sheet.

5.6.5 SET Window Dial at 1.00 ± .01 MeV AND

POSITION the Threshold Dial at 4.65 ± .01 MeV (for 239Pu).


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5.7 Count Rate Meter Calibration

5.7.1 IF Mechanical Zero (Count Rate Meter) As-Found reading taken in

Step 5.1.2 is in tolerance, RECORD in As-Left column on Data Sheet,

OR

IF reading was not within tolerance, SET mechanical zero by shorting left

hand side of resistor R29 (PHA board, Figure 2) to ground

5.7.1.1 TURN mechanical zero adjust screw UNTIL meter needle is

lined up with 1 ± 0.1.

5.7.1.2 REMOVE jumper/shorting device installed in above step AND

RECORD results in As-Left column on Data Sheet.

5.7.2 IF As-Found readings taken during Step 5.1.28.2 are in tolerance, RECORD

those readings in the As-Left Column of Data Sheet AND

GO TO Section 5.8.

5.7.3 SET instrument to gross mode.

5.7.4 CONNECT DVM to output across resistor.

5.7.5 CONNECT pulser to preamp board on models Alpha 5 or 5A as follows:

5.7.5.1 IF model Alpha 5, CONNECT pulser to Test Point on preamp

board.

OR

5.7.5.2 IF model Alpha 5A, CONNECT pulser to capacitor C103 on

preamp board.

5.7.6 ADJUST amplitude of the pulser for counting.

5.7.7 SET pulser to 10 cpm ± 0.1 cpm.

5.7.8 ADJUST zero control R-26 (Figure 2) for a reading of 10 cpm ± 0.5 cpm on

meter.


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5.7 Count Rate Meter Calibration (Cont.)

5.7.9 SET pulser to 5,000 - 15,000 cpm ± 0.01K cpm.

5.7.10 ADJUST span control R-28 (Figure 2) for reading of 5,000 - 15,000 cpm ±

0.5K cpm on meter.

NOTE - Zero and Span adjustments interact therefore several adjustments may be

necessary to balance settings.

5.7.11 REPEAT Zero and Span adjustments in accordance with Steps 5.7.7 thru

5.7.10 UNTIL correct readings are obtained (10 cpm ± 0.5 cpm and 10K

cpm ± 0.5K cpm).

5.7.12 SET pulser to 1, 10, 100, 1000 and 5,000 - 15,000 counts per minute with

pulser output amplitude approximately 1 to 10 mV.

5.7.12.1 ALLOW readings to stabilize.

5.7.12.2 OBSERVE AND RECORD the following As-Left values on

Data Sheet for each respective output given in Step5.7.12:

Count Rate Meter reading(s)

Output millivolts (0 – 10mV).


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5.8 Alarm Point and Delay Check

5.8.1 ADJUST alarm control delay R-33 on PHA-board, FULLY COUNTER

CLOCKWISE for minimum delay (ref. Figure 2).

5.8.2 TEST instrument alarm point by pushing Alarm Set Button AND

TURN Alarm Set Knob to any desired value (e.g. 10 cpm).

5.8.2.1 RECORD value used for Alarm Test on Data Sheet.

5.8.3 SETUP the pulse generator to provide an output pulse rate above the value

chosen for testing the Alarm in Step 5.8.2.

5.8.4 PERFORM the following as a continuous action:

5.8.4.1 SIMULTANEOUSLY START stopwatch and, INITIATE pulse

rate generator.

CLOCK time duration it takes for alarm to actuate.

CHECK alarm occurs as needle passes over alarm set

point.

5.8.5 RECORD the Time Duration it takes for alarm to actuate in the As-Found

section of Data Sheet.

5.8.6 IF As-Found Time Duration to actuate high alarm is within tolerance,

RECORD in As-Left section of Data Sheet AND

GO TO Section 5.9.

5.8.7 ADJUST delay pot R-33, on PHA board, for time delay of one (1) to

three (3) seconds or as directed by FWS.

5.8.8 REPEAT Steps 5.8.4, and 5.8.7 until the high alarm delay is within tolerance

AND

RECORD time duration value in As-Left column of Data Sheet.

5.8.9 SET Alarm Setpoint to full scale to avoid generation of additional alarms

during remainder of test.


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5.9 Percent Subtraction

5.9.1 IF not already so, ADJUST Alarm Setpoint to full scale to avoid generation

of additional alarms during remainder of test.

5.9.2 SWITCH the instrument to PHA mode.

5.9.3 MEASURE voltage between TP-1 and TP-2 on PHA board AND


5.9.4 IF As-Found value is within tolerance, RECORD in As-Left column of

Data Sheet AND

GO TO Step 5.9.6.

NOTE - Adjusting R2 in Step 5.9.5 to 125 mV sets the subtraction window to

1.25 MeV.

5.9.5 ADJUST R2 until voltage between TP-1 and TP-2 is 125 ± 1 mV AND

RECORD the As-Left reading on Data Sheet.

5.9.6 CONNECT pulser to preamp board on models Alpha 5 or 5A as follows:

5.9.6.1 IF model Alpha 5, CONNECT pulser to Test Point on preamp

board.

OR

IF model Alpha 5A, CONNECT pulser to capacitor C103 on

preamp board.

5.9.7 CONNECT a second pulser in parallel with the first pulser.

5.9.8 SET first (1st) pulser as follows:

5.9.8.1 SET pulser to 400 cpm ± 4 cpm at approximately one (1) to three

(3) millivolts.

5.9.8.2 ADJUST amplitude of the pulser UNTIL instrument begins

counting up to a count rate of 400 cpm ± 20 cpm.


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5.9 Percent Subtraction (Cont.)

5.9.8.3 TURN threshold dial to 5.65 MeV ± 0.01 MeV, and count rate

should drop to less than 20 cpm,

OR

IF not, REFINE pulser adjustment AND

REPEAT Steps 5.9.8.1, thru 5.9.8.3.

5.9.9 SET second (2nd) pulser as follows:

5.9.9.1 SET pulser to 800 cpm ± 8 cpm (241Am set pulser to 400 cpm

±20 cpm) at approximately 1 to 3 millivolts

5.9.9.2 ADJUST amplitude of pulser UNTIL instrument begins counting

up to a count rate of 800 cpm ± 40 cpm (400 cpm ± 20 cpm for 241Am).

5.9.9.3 TURN threshold dial back to 4.65 MeV ± 0.01 MeV AND meter

should read 400 cpm ± 20 cpm,

OR

IF not, REFINE pulser adjustment AND

REPEAT Steps 5.9.8, thru 5.9.9.

5.9.10 SWITCH to gross mode for count of 1200 cpm ± 60 cpm on the instrument,

(800 cpm ± 40 cpm for 241Am).

5.9.11 SWITCH to PHA-Sub mode.

NOTE - Adjusting R-14 in Step 5.9.12 sets percent subtraction at 25% (75% for 241Am).

5.9.12 ADJUST percent subtraction control (R-14, Figure 2), UNTIL meter reads

200 cpm ± 10 cpm (for 241Am 100 cpm ± 5 cpm).

5.9.13 RECORD Pass/Fail on As-Left column of Data Sheet AND

DISCONNECT pulsers.

5.9.14 RETURN to PHA mode.

5.9.15 TURN OFF instrument.

5.9.16 REPLACE noise shield as applicable.


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5.10 Flowmeter Calibration

NOTE - Instruments with adjustable flowmeters should be calibrated with the knob

adjusted for maximum flow.

5.10.1 INSTALL RADCON approved filter paper in filter holder.

5.10.2 RECORD filter paper type on Data Sheet.

5.10.3 CONNECT vacuum source to back (outlet) of CAM.

5.10.4 CONNECT Test Equipment to inlet of CAM AND

TURN ON vacuum source.

NOTE - One cubic foot per minute (CFM) = 28.32 LPM.

5.10.5 ADJUST vacuum flow knob to obtain flow rates per Data Sheet.

5.10.6 CHECK rotameter indication AND

RECORD the As-Found values for all points on Data Sheet.

5.10.7 IF rotameter values are within tolerance per Data Sheet, RECORD values in

As-Left column on Data Sheet AND

GO TO Section 5.11.

5.10.8 IF rotameter does not read within tolerance, REPAIR, CLEAN, OR

REPLACE rotameter AND

REPEAT Steps 5.10.1 thru 5.10.7.


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5.11 Perform Leak Test

5.11.1 BLOCK inlet to M&TE flowmeter.

5.11.2 CHECK M&TE and CAM rotameter indication for leaks (CAM and M&TE

should indicate approximately zero).

5.11.3 RECORD “Blocked” flow reading in As-Found column of Data Sheet.

5.11.4 IF “Blocked” flow reading is within tolerance per Data Sheet RECORD in

As-Left column of Data Sheet AND

GO TO Section 5.12.

5.11.5 IF “Blocked” flow reading is not within tolerance per Data Sheet, CHECK

for leaks, bad gaskets, loose fittings AND

REPAIR OR REPLACE.

5.11.6 AFTER repairing or replacing instrument, REPEAT Steps 5.11.1 through

5.11.5.


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5.12 Signal Level

5.12.1 ENSURE noise shield is in place prior to continuing.

5.12.2 IF not already set, PERFORM following adjustments:

Threshold Dial at 4.65 MeV ± 0.01

Window Dial at 1.00 MeV ± 0.01

Mode Switch in PHA position.

5.12.3 PLACE 5,000 - 15,000 dpm 239Pu source in the sample holder assembly.

5.12.4 TAKE two (2) minute counts at each of the following threshold setting AND

RECORD As-Found results on the Data Sheet:

4.80 MeV

4.65 MeV

4.50 MeV.

5.12.5 OBTAIN maximum count at 4.65 MeV threshold setting by adjusting signal

level control R-1 (Figure 2) AND

RECORD the resulting As-Left Count Rate on Data Sheet.

NOTE - Typical efficiency values are in the range of 9.0 to 13%.

5.12.6 WITH Threshold Dial at 4.65 MeV, TAKE an 8 minute count using low and

high sources to determine the counting efficiency AND

CALCULATE efficiencies using equation below.

5.12.6.1 RECORD counting efficiencies on Efficiency Sticker

(or Efficiency Tag) AND

ATTACH Efficiency Sticker (or Efficiency Tag) to front of

CAM.

5.12.6.2 RECORD the counting efficiency in the As-Left section of the

Data Sheet.

5.12.7 REMOVE sources.


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5.12 Signal Level (Cont.)

5.12.8 IF counting efficiencies for either of the two sources is less than 8.5%,

NOTIFY FWS for resolution.

5.12.9 CHECK the efficiency is within 10% of the detection efficiency value

recorded on Source for Alpha Cam.


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5.13 Operational Test

5.13.1 IF not already set, PERFORM the following adjustments:

Threshold Dial at 4.65 MeV ± 0.01

Window Dial at 1.00 MeV ± 0.01

Mode Switch to PHA-sub.

5.13.2 PLACE a nominal 500 - 1500 dpm 239Pu in the sample holder.

5.13.3 RUN instrument AND CONFIRM the following:

Counting rate is stable and is Consistent with efficiency

determinations completed in Section 5.12.

5.13.4 RECORD Pass/Fail results in As-Left column of Data Sheet.

5.13.5 REMOVE 500 - 1500 nominal dpm 239Pu source.


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5.14 Thorium on the Detector (by RadCon direction)

NOTE - If the CAM is in service in a low Radon area, a Thorium keep-alive source

(lantern Mantle) providing 2 to 6 cpm, may be taped on the detector.

5.14.1 IF directed by Radiological Control, PERFORM the following:

5.14.1.1 PLACE a small piece of thorium (from a radioactive lantern

mantle) on a small piece of scotch tape AND

APPLY it to lower edge of detector face, to obtain a count rate of

2-6 cpm.

5.14.1.2 APPLY Label to front of instrument:

Thorium on Detector ________ cpm.

5.14.1.3 RECORD Yes/No in As-Left column of Data Sheet to indicated

status of Thorium on Detector.


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5.15 As Left-Readings (Alternate Energy Set-Up)

5.15.1 IF not already set, PERFORM the following adjustments AND

RECORD the As-Left settings on Data Sheet.

Mode Switch set to PHA-sub

Threshold set at 4.65 MeV ± 0.01

Window set at 1.00 MeV ± 0.01.

5.15.2 ADJUST Alarm Setpoint to 20 ±1.0 cpm AND

RECORD in As-Left column of the Data Sheet.


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5.16 Restoration

5.16.1 IF any problems were encountered with calibration, INFORM FWS.

5.16.2 DISCONNECT AND REMOVE all Test Equipment.

5.16.3 RECORD test equipment information and calibration status on Data Sheet.

5.16.4 CHECK equipment system restoration by observing indications are

consistent with expected conditions.

5.16.5 AFFIX Efficiency Sticker and Calibration Sticker to front of CAM.

5.17 Acceptance Criteria

5.17.1 PLACE unit into alarm condition AND

CONFIRM alarm bell and rotating beacon operate.

5.17.2 CONFIRM sources have been removed from CAM and returned to their

carrying case and custodian when not in use (to minimize personnel exposure

and damage to source).

5.18 Review

5.18.1 INFORM Shift Manager and FWS test is complete.

5.18.2 FWS REVIEW AND ASSURE the following:

Completed Data Sheets meet the acceptance criteria.

Comments sections are filled out appropriately.

Work requests needed as a result of this procedure are identified and

generated.

Work request number(s) of any work documents generated as a result

of this procedure, are recorded in the Comments/Remarks section of

the Data Sheet, as applicable.

5.18.3 NOTIFY Environmental if As-Found Efficiency is not within 20% OR As-

Found Air Flow is not within 10% of M&TE reading.


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5.19 Records

This procedure is performed within a work package, as such, the procedure in its entirety

will be maintained as a record per the Work Control process.

The record custodian identified in the Company-level Records Inventory and Disposition

Schedule (RIDS) is responsible for record retention in accordance with TFC-BSM-

IRM_DC-C-02.


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Figure 1 – Alpha-5 and 5A Preamp Component Assembly


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Figure 2 – Component Layout of PHA Board

tank farm maintenance procedure calibration

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