ML13311A701
| ML13311A701 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/20/1982 |
| From: | Southern California Edison Co |
| To: | |
| Shared Package | |
| ML13311A465 | List: |
| References | |
| SO1-1.2-15, NUDOCS 8205240513 | |
| Download: ML13311A701 (16) | |
Text
S01-1.2-15 RESPONSE TO LOSS OF SECONDARY REV 0 HEAT SIN W ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED EMERGENCY INSTRUCTION 501-1.2-15 RESPONSE TO LOSS OF SECONDARY HEAT SINK
- 1.
PURPOSE:
The purpose of this instruction is to provide a RESPONSE TO LOSS OF SECONDARY HEAT SINK to minimize possible core damage by systematically attempting to establish feedwater flow from any available source.
II.
SYMPTOMS:
- 1. Less. than 10% narrow range level in any SG.
AND
- 2. Total flow to SGs less than 250 GPM.
8205240513 820520 PDR ADOCK 05000206 P
501-1.2-15 RESPONSE TO LOSS OF SECONDARY REV 0 HEAT SINK STP
-ACTION/EXPECTED RESPONSE SE NOT OBTAINED 1
Check If Secondary Heat Sink is Required:
- a.
RCS pressure -
GREATER
- a. IF less than steam THAN STEAM HEADER PRESSURE.
wader pressure, THEN go to 501-1.2-1.0, REACTOR TRIP OR Si, step 13.
2 of 16
ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 2
Try to Establish AFW Flow:
- a. Depress Train A AND Train B AUTO initiation pushbuttons.
- b.
Verify AFW Pumps Running:
- 1) Motor driven pump breaker
- 1) Manually start CLOSED.
pump.
- 2) Turtine driven pump.
- 2) Manually open va ves.
Steam warop valve -
OPEN OR Steam supply valve OPEN.
- c.
Verify AFW Valve Alignment:
I M--r driven purp:
- 1) Manually open or close valves as appropriate.
OPEN.
Main FW header discharge valve CLOSED.
- 2) Turbine driven purp AFW
- 2) Manually open header discharge valve valve.
OPEN.
- 3) Manually position controllers - AT controllers.
PRESET POSITION:
FCV -
2301 50%
FCV -
2300 100%
FCV -
3300 100%
FCy -
3301 50%
3 of 16
HEAT SINK ST..
ACTION/EXPECTED
RESPONSE
RESPONSE NOT OBTAINED 3
Check CST Level:
- a.
CST level - GREATER
- a. IF CST level low, TRAN 4 FT.
THEN transfer to FT-ernate AFW water supply per S01-7-3, AUXILIARY FEEDWATER SYSTEM.
4 Check AY clow:
- a. Total AjW flow to SGs
- a. IF less than 250 GPM, GREATER THAN THEN go to step 5.
250 GPM.
- b. AFW flow -
APPROX1MATELY
- b. IF AFW flow to one EQUAL TO ALL STEAM abnormally high GENERATOpS.
compared to other two, THEN close AFW valveT t that SG.
- c.
IF AFW flow greater
'nan 250 GPM, THEN go to SO1-1.2-1.0,7 ACTOR TRIP CR SAFETY.JEC-ION, step 13.
5 Check RCS Pressure:
- a. RCS pressure - GREATER
go to step 10.
4 of 16
501-1.2-15 RESPONSE TO LOSS OF SECONDARY REV 0 HEAT SINK STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 6
Align Main Feed Pumps To SGs:
- a. Verify feed pumps - OPERABLE.
- a. IF feed pump NOT operable, THEN go to step 9.
- b. Align feed pumps:
LV 852 A - OPEN.
HV 854 A -
OPEN.
HV 852 B -
OPEN.
HV 854 c -
OPEN.
- c.
Close MCV 20, MCV 21 AND DV 22.
- d. Close main feedwater reguIator bypass CVs.
- e. Start two condensate pumps.
- e. Go to step 9.
- f.
Start one feed pump.
- f. Throttle steam dmp valves to establish 300 psig steam header pressure. Go to step 9 AND continue procedure until steam header pressure is 300 psig.
5 of 16
501-1.2-15 RESPONSE TO LOSS OF SECONDARY REV 0 HEAT SINK P
ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 7
Establish Main Feed Flow To SGs:
- a. Open main feedwater
- a. Go to step 8.
regulator bypass CVs AND verify flow to SGs
- GREATER THAN ZERO.
- b. SG narrow range level
- b. IF less than 254, THEN GREATER THAN 26%.
Trottle main feedwater regulator bypass CVs to manta-n:
- 1) Total feed flow GREATER THAN 250 GPM.
- 2) Feed flow per SG LESS THAN 150 GPM.
- c. Throttle main feed flow to maintain narrow range level at 501 thile continuing with this procedure.
8 Check Level In SGs With Established Ma'n Feed Flow:
- a. Narrow range level in at
- a. IF less thah 10%,
least one SG TrEN go to step 9.
GREATER TRAN 100.
- b. Narrow range level in at least one SG INCREASING Go to S01-1.2-1.0, REACTOR TRIP OR SAFETY INJECTION, step 13.
6 of 16
0 STP ACTION/EXPECTED RESPONSE SPONSE NOT OBTAINED 9
Check For Loss Of Secondary Heat Sink:
- a.
RCS temperature:
- a. IF stable OR ecreasingTHEN Hot leg temperatures return to stW T.
INCREASING.
- b. RCS pressure -
INCREASING.
- b. IF stable OR eicreas i n THE N return to step T.
10 Check SI Initiation:
(T
- a.
SI -
INITIATED.
- 1) Wait approximately one minute, THEN go to step 17.
7 of 16
ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTI ON If offsite pcwer is lost after SI is reset, manual SI initiation will be necessary to load safeguard equipment onto the diesel powered 4 KV busses.
11 Reset SI:
- a. Reset SI at SLSS surveillance panels.
- b. Verify SI lockout switches RESET.
12 Establish Maximum Charging:
- a. Reset non-running charging pump lockout.
- b. Start second charging pump if available.
8 of 16
STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 13 Establish Charging Flow Path lhrough The SI Cold Leg Injection Lines:
- a. Align cold leg injection flowpath:
MOV 356 -
OPEN.
MOV 357 -
OPEN.
MOV 358 -
OPEN.
MOV 18 OPEN.
MOV 19
- OPEN.
- b. Isolate ncrmal charging fl ow.ath:
FCV 1112 -
CLOSED.
CV 304 CLOSED.
14 Check Charging F1ow Capability:
- a. Both charging pump breakers
- a. IF second charging CLOSED.
mpum not available, THEN go to step 15 b.
9 of 16
501-1.2-15
RESPONSE
TO LOSS OF SECONDARY REY 0 HEAT SINK 0 STP ACTION/EXPECTED
RESPONSE
RESPONSE NOT OBTAINED 15 Establish Flow Through The 51 Lold Leg Ihaection Lines:
- a. Place seal supply flow
- a. IF unable to establish controllers on MANUAL Tow due to instrument AND throttle flow to air failure, THEN go acrieve if possible:
to step 16.
Three injection lines
- 200 GPM PER LINE, THEN go to step 15 c.
OR Two injection lines
- 300 GPM PER LINE THEN go to step 15 c.
- b. With one charging pump
- b. IF unable to establish running, place seal supply TTow due to instrument flow controllers on MANUAL air failure, THEN go AND throttle flow to to step 16.
achieve if possible:
Three injection lines
- 100 GPM PER LINE.
OR Two injection lines 150 GPM PER LINE.
- c.
Go to step 17.
10 of 16
501-1.2-15 RESPONSE TO LOSS OF SECONDARY REV 0 HEAT SINK ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 16 Place Backup Seal Supply low controllers In Service:
- a. For each controller:
- 1) Place aux nitrogen supply switch -
ON.
- 2) Place aux position control switch -
ON.
- 3) Adjust aux cortroller to obtain desired flow per step 15.
- 4) Place aux position control switch -
OFF.
- 5) Repeat 2), 3) AND 4) for any further flow adjustments.
- b. SI cold leg injection flow
- b. IF flow NOT ESTABLISHED.
istablished, THEN attempt to align normal charging flow path.
17 Establish Conditions Support Ior RP Operations:
- a. Manually adjust CCW CLEAR.
flow.
11 of 16
S-1-.2-15 RESPONSE TO LOSS OF SECONDARY REY 0 HEAT SINK STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION Do not exceed a total charging pump flow of 600 GPM with two charging pumps or 300 GPM, with one charging pump to prevent damage to charging pumps.
18 Establish RCS Heat Removal Path:
- a. Verify power available to
- a. Restore power to PORY pressurizer PORY block block valves.
valves.
- b. Verify pressurizer PORY
- b. Open PORY block block valves open.
valves.
C.
Open both pressurizer PORVs.
12 of 16
S01-1.2-15 RESPONSE TO LOSS OF SECONDARY REV 0 HEAT SINK STP ACTION/EXPECTED RESPONSEPONSE N OBTAINED CAUTION RCS pressure considerations are not a factor in running an RCP.
19 Check RCS Heat Removal Path:
- a.
Both pressurizer PORYs
- a. IF both pressurizer OPEN.
7RVs NOT open, THEN:
- 1) Start one RCP.
- 2) Open steam dump valves to atmosphere.
- 3) Depressurize steam header to atmospheric pressure.
- 4) Align any available low pressure water source to the SGs.
- 5) Go to step 24.
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501-1.2-15 RESPONSE TO LOSS OF SECONDARY REY 0 HEAT SINK STEP 1ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINE 20 Maintain RCS Heat Removal Path:
- a.
Maintain SI cold 1 injection flow rate per step 15.
- b. Maintain both pressurizer PORVs open.
21 Prepare For Switchover To Cold Leg Rec-rculation:
- a. RWST level - LESS THAN 21%.
- a. Until RWST reaches 21% continue with subsequent steps.
- b. Align SI system for cold leg recirculation per S01-1.2-1.13, TRANSFER TO COLD LEG INJECTION AND RECIRCULATION, AND continue with this procedure.
22 Continue Attempts to Establish Secondary Heat Sink:
- a. AFW Flow.
- b. Feedwater flow.
14 of 16
ACTION/EXPECTED RESPONSE
'RESPONSE NOT OBTAINED 23 Depressurize Main Steam Header:
- a. Open steam dump valves to atmosphere.
- b. Depressurize main steam header to atmosphere pressure.
24 Align Alternate Secondary Heat Sink Sources:
- a. Align any available low pressure water source to the SGs.
25 Verify RCS Temperatures:
- a. Core exit TCs - DECREASING
- IF NOT decreasing, TREN return to step
- b.
Hot leg temperatures
- 2.
- DECREASING.
26 Check For Adequate Secondary Heat Sink:
- a. Narrow range level in at
- a. IF less than 10%, THEN least one SG with Fturn to step 22.
established feed flow
- GREATER THAN 10%.
- b. RCS subcooling based on
- b. IF less than 40 OF, core exit TCs - GREATER TREN return to THAN 40 0 F.
step 22.
15 of 16
STEP..ACTION/EXPECTED
RESPONSE
RESPONSE NOT OBTAINED 27 Isolate RCS Heat Removal Path:
- a. Monitor and record core exit baseline temperatures.
- b. Close both pressurizer PORVs.
- b. IF any PORY cannot be
- cTosed, THEN manually close it-s-Tock valve.
- c.
Compare core exit TC
- c. IF increase greater temperature increase to Than 15 OF, THEN baseline -
INCREASE reopen both LESS THAN 15 OF.
pressurizer PORYs and return to step 21.
28 Check If SI Can Be Terminated:
- a. RCS pressure -
INCREASES
return to step 26.
- b. Pressurizer level
- b. DO NOT TERMINATE SI, GREATER THAN 50%.
return to step 26.
- c.
RCS subcooling -
GREATER
- c. DO NOT TERMINATE SI, THAN 40 OF.
return to step 26.
- d.
Go to 501-1.2-1.21, SI TERMINATION FOLLOWING LOSS OF SECONDARY COOLANT.
-END H. E. MORGAN MANAGER, STATION OPERATIONS 16 of 16