350mhz rf waveguide air personnel safety system dave bromberek march 3, 2008
Post on 04-Jan-2016
217 Views
Preview:
TRANSCRIPT
350MHz RF
Waveguide Air Personnel Safety
System
Dave Bromberek
March 3, 2008
2
Outline
System Operation and Layout
Failure Modes
3 Year Calibration
3
System Operation
Pressurization of the 350MHz waveguide system in Bldg. 420 is used as THE means of providing rf radiation personnel protection in the event of a breach of the waveguide system (see also technical note “Measurements of RF Power Radiated From Open WR2300 Waveguide Flanges” – D.Horan 7/3/05).
Blowers on the rf cavities provide cooling air to the input couplers and also slightly pressurize the waveguides to ≈ 3-4”H2O (≈ .1-.15 psi.). The pressure is monitored and interlocked by eight waveguide photohelic pressure gauges, one or more of which is capable of detecting a waveguide flange gap of .185”, in all available waveguide switching modes.
A trip of any waveguide photohelic will shutdown all five 350MHz klystron stations.
Orphan photohelics are installed at RF1 and RF3 to provide protection in these areas when the stations are switched off-line.
Additional photohelics monitor cavity blower pressure (Not Interlocked).
4
System Layout
Two blowers supply cooling air to the input coupler and slightly pressurize the waveguide.
Each cavity’s blower manifold is monitored by a photohelic.
Cavity blower pressure is alarm only
Each sector’s waveguide is monitored by a photohelic.
Waveguide air pressure is a PSS interlock and will trip all 5, 350MHz rf stations.
StaticAir
Pressure~4"H2O
To Waveguide AirPhotohelic
Bldg. 420Waveguide
Blower Air In
Blower Air In
InputCoupler
To Cavity Photohelic
B1 B2
Exhaust Air Out
120VAC CKT 1 120VAC CKT 2
Waveguide Air Thermocouple
IR
IR
5
System Layout
RF1 RF2 RF3 RF5 RF4
C1 C2 C3 C4
B1
B2
B1
B2
B1
B2
B1
B2
C1 C2 C3 C4
B1
B2
B1
B2
B1
B2
B1
B2
C1 C2 C3 C4
B1
B2
B1
B2
B1
B2
B1
B2
C1 C2 C3 C4
B1
B2
B1
B2
B1
B2
B1
B2
Sector 36 Sector 37 Sector 38 Sector 40
C1 C2 C3 C4
B1
B2
B1
B2
B1
B2
B1
B2
BoosterInjection
BoosterExtraction
To TestStand
P P
PPP
B1
B2
P
Cavity Blowers & Manifold
Photohelic Pressure Sampling Port
Transmission Waveguide & Air Path
P
PP
6
System Layout
There are two blowers on each rf cavity, one being redundant. The cavity photohelics are on a scale on 0” – 10”H2O and read 10” or better with both blowers at full speed.
Blowers are fed from two 120VAC power circuits/sector. Each cavity blower pair is fed from a separate circuit.
7
System Layout
Waveguide photohelics are on a scale of 0” – 5”H20 and normally read between 3” - 4.5”H2O.
Pressure sampling port is located on a section of waveguide in Bldg. 420 (see drawing)
8
System Layout
Photohelic gauges are individually fused.
A 24VDC power supply feeds the setpoint contacts from the cavity gauges to Allen/Bradley
Fuse
24VDC Power Supply
9
System Layout
10
Blower Control Screen
From RF Panel – Select Sector
Cavity Photohelic Setpoint Contacts
Blower AC Power Circuits
11
RF6 Waveguide Air PSS Screen
From RF Panel - Misc/Tools
12
OAGapps Data
From x-term type OAGapps
13
OAGapps Data
14
OAGapps Data
15
OAGapps Data
16
OAGapps Data
17
Failure Modes
Cavity Blower Alarm Check locally Dead or dying blower
8” H2O Check OAGapps
Symptoms Steps Problem
18
Failure Modes
Cavity Blower Alarm Check locally 2 dead blowers
0”H2O Check RF6 Hose disconnected
Check OAGapps Bad Gauge
Symptoms Steps Problem
19
Failure Modes
Cavity photohelic hoses CAN be disconnected and connected to an adjacent gauge to eliminate the photohelic as the culprit.
NEVER disconnect the waveguide photohelic hose unless the rf stations are already down due to a WG Air PSS trip.
If it is determined that a waveguide photohelic is the problem, or the system is tripped on waveguide air, a work request and CCWP must be submitted and approved.
C1C2
C3C4 WG
20
Failure Modes
4 Cavity Blowers in Alarm Check 24VDC P.S. Power supply
10”H2O
Symptoms Steps Problem
21
Failure Modes
4 Cavity Blowers in Alarm Check OAGapps AC Power
0” or Low “H2O Check AC Power breakers
Waveguide Air Trip
Symptoms Steps Problem
22
Failure Modes
Waveguide Air Trip Check waveguide integrity Any of these
0” or Low ‘H2O Check for hose disconnection
Gauge
Symptoms Steps Problem
23
3-Year Calibration & Testing
See “Technical Note on the Testing of the 350MHz Waveguide Air Personnel Safety System” – D. Bromberek 10/21/05
Test and adjust setpoints
– Requires the opening/closing of five waveguide flanges (one at each station), in twelve waveguide switching modes – 60 iterations
– Data is recorded and setpoints chosen• .185” uniform gap in a waveguide flange trips RF6 PSS System• .185” gap is detected by at least one photohelic in every
waveguide configuration• Loss of one cavity blower does not trip the PSS• Loss of two cavity blowers does trip the PSS (Not always possible)
– Validation and sign-off of CCWP requires tripping each of the eight waveguide photohelics one at a time, and verifying that it trips ALL FIVE STATIONS.
24
3-Year Calibration & Testing
.185” Spacers
.185” spacers in use
25
3-Year Calibration & Testing
Flange #314 @ RF3
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
No
rma
l RF
3O
rph
an
Op
en
RF
3 O
rph
an
No
rma
l S3
6
Op
en
S3
6
No
rma
l S3
7
Op
en
S3
7
No
rma
l S3
8
Op
en
S3
8
No
rma
l S4
0
Op
en
S4
0
No
rma
l In
j
Op
en
Inj
No
rma
l Ext
Op
en
Ext
1 1/4-2/3-5
2 2/3-4-5
3 1/4-3-5
4 1/4-2-5
5 1-2/3-5
6 1/4-2-3
7 2-4-3
8 1-2-3
9 1-2-5
10 3-4-5
11 2-4-5
12 1-3-5
Data Collected @ RF3 – May 2005
26
3-Year Calibration & Testing
Flange #314 @ RF3 Min/Max/Avg RF3 On-Line SR Modes
4.15 4.30 4.203.90 4.05 3.95
1.45 1.55 1.50
3.45 3.60 3.503.70 3.703.70
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
Low High Avg
" H
2O
RF3/S37 Normal Pressure
S37 -1 Blower
RF3/S37 .185" Gap
S37 -2 Blowers
S37 Setpoint
Simplified Data From RF3 – May 2005
27
3-Year Calibration & Testing
Calibration due spring shutdown ’08.
top related