tank farm alarm response procedure aw farm usq # tf-19 ... library/011819...tsr compliance respond...

TSR Compliance

Respond to Panel ANN-106 Alarms at 271-AW

Type

REFERENCE Document No.

ARP-T-231-00106 Rev/Mod

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Tank Farm Alarm Response Procedure AW Farm

USQ # TF-19-0019-S, Rev. 0

CHANGE HISTORY ( LAST 5 REV-MODS )

Rev-Mod Release Date Justification: Summary of Changes

I-3 01/03/2019 WRPS-PER-2018-2904

Struck out immediate actions [5], [6], part of [8] and [9]

supplemental action [10] possible causes 2

[5] IF directed by the Shift Manager/OE, PERFORM any/all of

the following.

[6] IF alarm clears, PROCEED to Step [11]

[8] CHECK air inlet station opening for obstructions AND

REMOVE. Added ENSURE AW-106 inlet station 12”

isolation valve (AW106-VTP-V-206) is OPEN

[9] OPEN isolated inlet station valves per procedure TO-060-

107.

[10] IF the above steps do not restore tank pressure to proper

range, NOTIFY Shift Manager AND

IF directed, PERFORM the following:

OPEN 3" bypass line valve (AW106-VTP-V-212) on Tank 241-

AW-106.

CLOSE corresponding inlet filter station 12" butterfly valve

(AW106-VTP-V-206) for tank 241-AW-106.

OR Both Primary A and B Train exhaust fans were being

operated for a job involving another tank.

Added new immediate action with substeps

1. IF directed by the Shift Manager/OE, PERFORM

any/all of the following:

1. MONITOR tank pressure on TFMCS.

2. ADJUST exhauster stack flow set point per

TO-060-107.

3. REMOVE any ice buildup or obstructions

from AW-106 inlet station.

4. REMOVE tape from valve pits

I-2 10/09/2018 Operations request and

TF Automation / DSA changes

Removed/Replaced references to LCO 3.5. Removed steps that

CHECK magnahelic pressure gauge.

I-1 08/30/2017 Operations request Updated actions for alarms (immediate and supplemental) and

reference documents.

I-0 05/25/2016 Periodic review. No changes identified

H-0 06/09/2014 Periodic review.

Add possible cause for HI Level LD Pit 06C. Add reference

documents as identified. Add immediate actions to HI Pressure

Tank 106 and delete possible cause. Add immediate actions to

Low Pressure Tank 106. Remove Setpoint variance for Annulus

Leak Detected Tank 106 for WSTA-LDA-156. Revised

Setpoint for Low Air Flow A Train and B Train and add step to

Request Shift Manager to evaluate environmental notification.

241-AW-271 Building Alarm Index

Alarm Description Page

01 ................. Hi Level Leak Detection Pit 06C (WSTA-WFA-136) ............................... 3

02 ................. Hi Pressure Tank 106 (WST-PAH-116) ..................................................... 5

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03 ................. Low Pressure Tank 106 (Hi Vacuum) (WST-PAL 116) ............................ 7

04 ................. Annulus Leak Detected Tank 106 (WSTA-LDA-156) ............................... 9

09 ................. Low Air Flow A Train Annulus Exh (VTA-PDAL-710) ........................... 11

10 ................. Low Air Flow B Train Annulus Exh (VTA-PDAL-810) ........................... 13

Figure 1 ........ 241-AW-271 Instrument Building Alarm Panel ANN-106 ........................ 15

RECORDS

No records are generated during the performance of this procedure.

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01 Hi Level Leak Detection Pit 06C (WSTA-WFA-136) Facility: 241-AW-271 Building

HI LEVEL

LEAK DETECTOR

PIT 06C

(WSTA-WFA-136)

01

Panel: ANN-106 Alarm #: 01

Source: AW06C-WSTA-WFT-136 Setpoint: 37 inches

above pit floor

Alarm Class: Area Status

Alarm Description: Liquid level in the leak detection pit has increased to alarm setpoint.

NOTE - Alarm Response Procedures are not designed for, nor intended to be applied to, "expected"

alarms generated by approved work activities or procedures.

Immediate Actions:

CHECK status of following annunciators:

Panel ANN-106 alarm 04, annulus leak detected tank 106 (WSTA-LDA-156).

CHECK pit weight factor indicator, AW271-WSTA-WFI-126, for a level increase.

NOTIFY Shift Manager of findings.

Supplemental Actions:

CHECK annulus Enrafs AW106-WSTA-LDT-151, AW106-WSTA-LDT-152, and,

AW106-WSTA-LDT-153 LEVEL READINGS. Enraf local alarms (HA indication will

be in display for an alarm condition).

CHECK associated tank level Enraf (AW106-WST-LIT-106) for any change.

NOTIFY Shift Manager of alarm, actions and findings.

[6.1] IF annulus leak detectors show increased level in the annulus.

[6.1.1] Shift Manager EVALUATE TF-AOP-005 entry criteria.

[6.1.2] Shift Manager NOTIFY Maintenance to perform leak detection

verification per 6-LDD-485.

(Continued on Next Page)

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Facility: 241-AW-271 Building

HI LEVEL

LEAK DETECTOR PIT 06C

(WSTA-WFA-136)

01


Source: AW06C-WSTA-WFT-136 Setpoint: 37 inches

above pit floor

(Continued)

Possible Causes:

1. Condensate, rainwater, or snowmelt has accumulated in the pit.

2. A waste leak from the primary tank to the annulus and then from the annulus to the leak

detection pit.

3. A dip tube in the pit is plugged or has a purge air problem.

References:

Drawings: H-14-020502, H-2-70305, H-2-70306, H-2-70394, H-2-70413.

Documents: OSD-T-151-00007, Operating Specifications for the Double Shell Storage Tanks

TO-040-590, Leak Detection Wells, Annulus Leak Detection Systems

RPP-16922, Environmental Specification Requirements

OSD-T-151-00031, Operating Specifications for Tank Farm Leak Detection and

Single Shell Tank Intrusion Detection, Table 3-1

TF-AOP-005, Response to Unexpected Tank Temperature or Flammable Gas

Increase or Level Change

6-LDD-485, ENRAF Series 854 Annulus Leak Detection Gauges Calibration and

Maintenance.

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02 Hi Pressure Tank 106 (WST-PAH-116) Facility: 241-AW-271 Building

HI PRESSURE

TANK 106

(LOW VACUUM)

(WST-PAH-116)

02


Source: AW06C-WST-PT-116 Setpoint: - 0.5 inches WG

Alarm Class: Technical Safety Requirement (LCO 3.1, DST Primary Tank Ventilation Systems, and

LCO 3.4, DST Induced Gas Release Event Flammable Gas Control)

Alarm Description: Tank 241-AW-106 vapor space has an increasing pressure (Low Vacuum).



Automatic Actions:

1. Activates Audible Warning Alarm, "AW TANKS HI PRESSURE", to notify farm

occupants of pressurization.

Immediate Actions:

EVACUATE personnel from aw farm to a protected or upwind area.

REQUEST Shift Manager respond per TF-AOP-021.

CHECK AW farm tank pressures on TFMCS.

CHECK primary exhaust train is running AND

IF exhauster has shut down, NOTIFY Shift Manager of alarms and actions.

STOP all waste disturbing activities in 241-AW-106.

IF directed by Shift Manager/OE, RESTART primary ventilation per TO-060-107.


CONTINUE TO MONITOR SYSTEM PARAMETERS AND

NOTIFY Shift Manager of changing indications.


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HI PRESSURE

TANK 106

(LOW VACUUM)

(WST-PAH-116)

02



(Continued)

Possible Causes:

1. Loss of primary ventilation.

2. Hot waste entering tank during transfer raises the pressure through evaporation.

3. Open riser, open pit drain, and/or missing sealing media on pit cover block

seams/penetrations, admits too much air.

4. Failure of pressure transmitter or pressure alarm switch.

5. Gas release event.

6. Plugged HEPA filters.

7. Failed closed exhaust damper duct valve.

References:

Drawings: H-14-020602.

Documents: OSD-T-151-00007, Operating Specifications for Double Shell Storage Tanks

TF-AOP-021, Response to Tank Farm Ventilation Upset

TO-060-107, Operate AW Tank Farm Primary Ventilation System (VTP)

HNF-SD-WM-TSR-006, Tank Farms Technical Safety Requirements.

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03 Low Pressure Tank 106 (Hi Vacuum) (WST-PAL 116) Facility: 241-AW-271 Building

LOW PRESSURE

TANK 106

(HI VACUUM)

(WST-PAL-116)

03



Alarm Class: Plant Stability

Alarm Description: Low Pressure Tank 241-AW-106 (Hi Vacuum).



- Loss of instrument/compressed air will cause the tank pressure charts to fail to the low pressure

(HI VACUUM) position.

Immediate Actions:

CHECK status of the compressed air system AND

IF compressed air system was down, RECOMMEND to Shift Manager response per

TF-AOP-002.

CHECK status of the following annunciators:

Panels ANN-101 through ANN-105 alarm 03, low pressure tank 10X,

(HI VACUUM), (WST-PAL-11X).

CHECK tank pressure strip chart recorder, located on alarm panel just below alarm

windows, AW271-WST-PR-116 (red colored trace), in 271-AW.

CHECK AW farm tank pressures on TFMCS.

IF DIRECTED by the Shift Manager/OE, PERFORM any/all of the following:

[5.1] MONITOR tank pressure on TFMCS.

[5.2] ADJUST exhauster stack flow set point per TO-060-107.

[5.3] REMOVE any ice buildup or obstructions from AW-106 inlet station.

[5.4] REMOVE tape from valve pits.

NOTE - The port controller should float freely. During a high vacuum condition the vacuum

breaker should open.

CHECK port controller (AW106-VTP-FC-206) for binding.

ENSURE AW-106 inlet station 12” isolation valve (AW106-VTP-V-206) is OPEN.

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LOW PRESSURE

TANK 106

(HI VACUUM)

(WST-PAL-116)

03



(Continued) Supplemental Actions:

NOTIFY Shift Manager of actions and findings.

Possible Causes:

1. Obstruction of air inlet (i.e., foreign object across inlet screen, frost/ice buildup on inlet,

filter dirty).

2. Primary exhaust fan remained ON after backup fan started, with or without an open riser.

3. Vacuum or flow rates out of adjustment.

4. Loss of air compressor.

5. Port controller binding.

6. Vacuum breaker is stuck shut.

References:

Drawings: H-14-020102 and H-14-020602.

Documents: OSD-T-151-00007, Operating Specifications for Double Shell Storage Tanks

TO-060-107, Operate AW Tank Farm Primary Ventilation System (VTP)

TF-AOP-002, Response to Loss of Compressed Air.

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04 Annulus Leak Detected Tank 106 (WSTA-LDA-156) Facility: 241-AW-271 Building

ANNULUS LEAK

DETECTED TANK 106

(WSTA-LDA-156)

04


Source: AW106-WSTA-LDT-151

AW106-WSTA-LDT-152

AW106-WSTA-LDT-153

Setpoint: 0.25 inches above the

annulus bottom

Alarm Class: Environmental

Alarm Description: One or more of the three leak detectors in the tank 241-AW-106 annulus is in

alarm status. This is a common alarm, annunciating when any one of the three

leak detectors in the annulus reaches the setpoint.



Automatic Actions:

None

Immediate Actions:

ACKNOWLEDGE alarm.

IF a transfer is in progress into or out of 241-AW-105, REQUEST MBD Operator shut

down transfer.

CHECK annulus Enrafs AW106-WSTA-LDT-151, AW106-WSTA-LDT-152,

and, AW106-WSTA-LDT-153 for the following:

Enraf local alarms.(HA indication will be in display for an alarm condition)

Enraf level readings.

CHECK associated tank level Enraf (AW106-WST-LIT-106) for any change.

NOTIFY Shift Manager of alarm, actions and findings.

[5.1] IF annulus leak detectors show increased level in the annulus.

[5.1.1] Shift Manager EVALUATE TF-AOP-005 entry criteria.

[5.1.2] Shift Manager NOTIFY maintenance to perform leak detection

verification per 6-LDD-485.


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ANNULUS LEAK

DETECTED

TANK 106

(WSTA-LDA-156)

04


Source: AW106-WSTA-LDT-151

AW106-WSTA-LDT-152

AW106-WSTA-LDT-153

Setpoint: 0.25 inches above the

annulus bottom

(Continued) Supplemental Actions:

Shift Manager NOTIFY Environmental ON-CALL per TF-REC-001.

Possible Causes:

1. Waste leaking from primary tank to annulus.

2. Condensate, rainwater, snowmelt, or other water has entered the annulus from outside.

3. Time delay relay or control relay fails.

4. Instrument malfunction.

5. Enraf performed a reset due to loss of power.

References:

Drawings: H-2-70362 Sht.1, H-14-020502.

Documents: RPP-16922, Environmental Specification Requirements

OSD-T-151-00031, Operating Specifications for Tank Farm Leak Detection and

Single Shell Tank Intrusion Detection, Table 3-1

TF-AOP-005, Response to Unexpected Tank Temperature or Flammable Gas

Increase or Level Change

6-LDD-485, ENRAF Series 854 Annulus Leak Detection Gauges Calibration and

Maintenance.

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09 Low Air Flow A Train Annulus Exh (VTA-PDAL-710) Facility: 241-AW-271 Building

LOW AIR FLOW

A TRAIN

ANNULUS EXH

(VTA-PDAL-710)

09


Source: AW241-VTA-PDS-710 Setpoint: 1.5 inches WG

Alarm Class: Environmental Impact

Alarm Description: Low Air Flow A Train Annulus Exhaust.



- This alarm is caused when the fan differential pressure drops to 1.5 inches WG. Normally the

fan has to stop for the differential pressure to drop this low.

Immediate Actions:

CHECK if panel ANN-102 ALARM 9, HI RAD alarm annulus EXH stack

(VTA-RAH-910C) is alarming.

IF A-train annulus fan is not running, and panel ANN-102 ALARM 09, HI RAD alarm

annulus EXH stack (VTA-RAH-910C) is not alarming, ATTEMPT to restart fan per

TO-060-105.

IF fan will not restart and B-train is operating, ENSURE VTA system is aligned to

ventilate all six tank annuli per TO-060-105.

IF fan will not restart and B-train is not operating, ENSURE that the VTA system is

shutdown per TO-060-105.



Panels ANN-101 through ANN-106 alarm 04, annulus leak detected tank 10X,

(WSTA-LDA-15X).


REQUEST Shift Manager to evaluate need to notify environmental.


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LOW AIR FLOW

A TRAIN

ANNULUS EXH

(VTA-PDAL-710)

09



(Continued) Possible Causes:

1. Mechanical problem with one of the fan's components.

2. Breaker to AW241-VTA-EF-003 has tripped/failed.

3. One fan ventilating all 6 annulus tanks.

4. Fan shut down by high annulus exhaust stack radiation.

References:

Drawings: H-2-70325, H-2-70362, H-14-020202.

Documents: TO-060-105, Operate the 241-AW Annulus Ventilation System (VTA).

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10 Low Air Flow B Train Annulus Exh (VTA-PDAL-810) Facility: 241-AW-271 Building

Panel: ANN-106 Alarm #: 10 LOW AIR FLOW

B TRAIN

ANNULUS EXH

(VTA-PDAL-810)

10


Alarm Class: Environmental Impact

Alarm Description: Low Air Flow B Train Annulus Exhaust.



- This alarm is caused when the fan differential pressure drops to 1.5 inches WG. Normally the

fan has to stop for the differential pressure to drop this low.

Immediate Actions:

CHECK if panel ANN-102 alarm 09, HI RAD alarm annulus EXH stack

(VTA-RAH-910C) is alarming.

IF B-train annulus fan is not running, and panel ANN-102 alarm 09, HI RAD alarm

annulus EXH stack (VTA-RAH-910C) is not alarming, ATTEMPT to restart fan per

TO-060-105.

IF fan will not restart and A-train is operating, ENSURE VTA system is aligned to

ventilate all six tank annuli per TO-060-105.

IF fan will not restart and A-train is not operating, ENSURE that the VTA system is

shutdown per TO-060-105.



Panels ANN-101 through ANN-106 alarm 04, annulus leak detected tank 10X,

(WSTA-LDA-15X).


REQUEST Shift Manager to evaluate need to notify environmental.

Possible Causes:

1. Mechanical problem with one of the fan's components.

2. Breaker to AW241-VTA-EF-003 has tripped/failed.

3. One fan ventilating all 6 annulus tanks.

4. Fan shut down by high annulus exhaust stack radiation.


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LOW AIR FLOW

B TRAIN

ANNULUS EXH

(VTA-PDAL-810)

10



(Continued) References:

Drawings: H-2-70325, H-2-70362, H-14-020202.

Documents: TO-060-105, Operate the 241-AW Annulus Ventilation System (VTA).

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Figure 1 241-AW-271 Instrument Building Alarm Panel ANN-106

Figure 1 – 241-AW-271 Instrument Building Alarm Panel ANN-106 ANN – 106

HI LEVEL

LEAK DETECTOR

PIT 06C

(WSTA-WFA-136)

HI PRESSURE

TANK 106

(LOW VACUUM)

(WST-PAH-116)

LOW PRESSURE

TANK 106

(HI VACUUM)

(WST-PAL-116)

ANNULUS

LEAK DETECTED

TANK 106

(WSTA-LDA-156)

01 02 03 04 05

LOW AIR FLOW

A TRAIN

ANNULUS EXH

(VTA-PDAL-710)

LOW AIR FLOW

B TRAIN

ANNULUS EXH

(VTA-PDAL-810)

06 07 08 09 10