ML13311A682
| ML13311A682 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/20/1982 |
| From: | Southern California Edison Co |
| To: | |
| Shared Package | |
| ML13311A465 | List: |
| References | |
| SO1-1.2-14, NUDOCS 8205240510 | |
| Download: ML13311A682 (12) | |
Text
Sl-1-.2-14 RESPCNSE TO INADEQUATE CORE COOLING REV 0 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED EMERGENCY INSTRUCTION 501-1.2-14 RESPONSE TO INADEQUATE CORE COOLING The purpose of this instruction is to provide a RESPONSE TO INADEQUATE CORE COOLING to minimize possible core damage by systematically attempting to establish alternate means of core cooling.
A. The following are symptoms of inadequate core cooling:
- 1. Five or more core exit thermocouples greater than 1200 OP.
- 2. RCS hot leg RT~s greater than 700 OF.
8205240510 820520 1 of 12 PDR ADOCK 05000206 P
501-1.2-14 RESPONSE TO INADEQUATE CORE COOLING REV 0 STEP ACTION/EXPECTED
RESPONSE
C RESPONSE NOT OBTAINED CAUTION If prior to reaching step 11, RWST level decreases to 21', the actions of 501-1.2-1.13, TRANSFER TO COLD IECTION AND RECIRC ULATON must be cpleted.
NOTE:
The Check boxes in step 1 are provided as. an aid in assuring that a minimum of one SI train (A or B) is fully aligned.
2 of 12
501-1.2-14 RESPONSE TO INADEQUATE CORE COOLING REV 0 ACTION/EXPECTED
RESPONSE
RESPONSE NOT OBTAINED I
Try To Establish SI Flow To RCS:
- a. Verify both SI trains
- a. Manually initiate SI initiated.
- b. SI pump breakers.
- b. Manually start pump.
12CO5 - CLOSED.
i1C05 -
CLOSED.
E A) 12CO4 -
CLOSED.
11CD4 -
CLOSED.
II
- c. Verify SI Valve Alignment.
- c. Manually open or close valves as appropriate.
Feed pump valves:
A a
HV 852 A&B - CLOSED.
HV 854 A&B - CLOSE.E HV 851 A&B - OPEN.
HV 853 A&B -
OPEN.
CV 875 A&B - OPEN.
- d. Manually open valves MOVs 850 A,B and as appropriate.
C -
OPEN.
CHECK FOR FLOW.
3 of 12
STE ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 2
Try To Establish Charging Flow To RCS:
- a. Align charging pump suction:
O07 OF valves as apprpriate.
AUTO AND OPE.
- 2) MDV 1100 C -
OUT OF ALTO AND CLOSED.
Verify both chargng Pump
- b. Manuall start both breaKers -
CLOE.
puTs:
- 1) Man a"Iy start preselected pump.
- 2) Manually start standby pump:
Reset Si at SLSS surveillance Panels.
Reset non-running charging pump lockout.
Start second charging pump..
- c. Align cold leg injection flow path:
MOV 356 -
OPEN.
MOV 357 - OPEN.
MOV 358 -
OPEN.
MOV 18 -
OPEN.
MOV 19 -
OPEN.
- d. Throttle FC 1115 A, B AND C to establish maximum fT1w.
Do not exceed 600 gpm.
4 of 12
S01-1.2-14 RESPONSE TO INADEQUATE CORE COOLING REV 0 ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 3Establish Conditions Support For ROP Uperations:
- a. Manually adjust CCW RESET.
flow.
CAUTION AF pump water supply must be mntained to ensure adeuate heat sink.
4 Check CST Level:
- a. CST level -
GREATER
- a. IF CST level low, THAN 4 FT.
THEN' transfer to alternate AFW water supply per SCI-7-3, AUX LIARY FEEDWATER 5
Check SG L evel-s.:
- a.
Narrow range level
- a. IF less than 26%,
THEN
- GREATER THAN 26%.
Fiintain:
- 1) Total AF flow
- GREATER THAN 250 GPM.
- b. Throttle AFW flow to maintain narrow range level at 50%.
5 of 12
S01-1.2-14 RESPONSE TO INADEQUATE CORE COOLING REV 0 ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION TC printouts drop off the thousands digit, therefore, 12C0 OF will appear as 200 OF.
6 Check Core Cooling:
- a.
Core Exit TCs -
LESS THAN
- a. IF 5 TCs or kore are 1200 F.
- Lgh, THEN go to step 7.
- b.
Core exit TCs - DECREASING
- b. IF increasing, THEN returr to step T.
- c.
LESS
- c. IF greater than THAN 700 OF.
7L 0 F, ThEN go tO step 7.
IF RC charging flow is
- d. IF flow is not ablished OR IF RCS Tndicated from either pressure is less than source, THEN return 1170 psig, SI flow to step T.
indicators indicate flow.
- e.
Return to S01-1.2-1.0, REACTOR TRIP OR SAFETY IJECTION, step 10.
6 of 12
ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 7
Check Pressurizer POPYs And Block Valves:
- a.
Power available to block
- a. Restore power to block valves.
valves.
- b. P0RVs - CLOSED.
IF any PORV cannot be Josed, THEN manually clse its blec valve.
- c. lock valves -
PEN.
- c. Open block valve unless it was closed to isolate a faulty P ORV.
7 of 12
501-1.2-14 RESPONSE TO IRADEQUATE CORE COOLING REV 0 0 SACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 8
Rapidly Decrease Steam Header Pressure to Atmospheric -Pressu re:
- a.
Place steam dump mode
- a. IF steam dumo to the selector switch to PRESSURE condenser not avail
- CONTROL, CONDENSER.
able, place steam dump mode selector switch to PRESSURE CONTROL ATMOS.
- b.
Place steam dump controller to MAN'AL N open steam ump valves.
- c. Verify steam 'header pressure
- c. IF steam header decreasing to pFessure NOT ATMCSPHEPC PRESSURE.
decreasinc, THEN go to step 1DT
- d. Verify SI flow to RP0
- d. Go to step 10.
GREATER THAN ZERO.
9 Check Core Co-linc:
- a. Core exit TCs -
LESS THAN a
IF cbnditior NOT 1200 OF AND DECREASING.satisfied, THEN go to step TM
- b. RCS hot leg RTDS - LESS
- b. IF condition NOT THAN 700 OF.
satisfied, THEN go to step 71
- c. IF RC charging flow is
- c. IF flow is not ITtablished OR IF RCS Tidicated from either pressure is Tess than source, THEN return 1170 psig, THEN SI flow to step TT indicators inticate flow.
- d. Return to 01-1.2-1.0, REACTOR sTRIP OR SAFETY INSPECTION step, 10.
8 of 12
S01-1.2-14 RESPONSE TO IkAEUATE COPE COOLING REV 0 STP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTANED CAUTION Nornial conditions for starting RCPs are desired but should not prevent RCP start.
10 Check Core Exit Trs:
- a.
Temperature - LESS THAN
- a. Start RPOs AND operate 1200 OF.
until core exit TCs less than 1200 aF.
- 1) IF core exit TCs greater than 1200 OF and all available RCPs running, THEN open all pressurizer PORVs and block valves.
- 3) Go to step 11.
- b. Continue dumping steam.
- c. Go to step 13.
9 of 12
-- TEP.} --
ACTION/EXPECTED RESPONSERESONSE NOT OBTAINED CAUTI ON RWST level should be monitored after establishing the flow path in step 11a.
Transfer to step 12 b flow path should be initiated as RWST level approaches 12% and must be completed prior to reaching 7%.
11 Estab6Dsh Alterate Low Pressure L
nection I ow
- a. RWST level - GREATER
- a. Go to step 12.
TAN 12%.
- b. Verify MCV 8813 -
OPEN.
- b. Manually open valve.
c.
Open MOV 880
- d. Verify MCV 356, MDV 357
- d. Manually open valves.
AND MCV 358 -
OPEN.
- e. Verify both refueling water
- e. Manually start :umps.
pump breakers - CLOSED.
IF only one refueling water pump running, THEN override and 7T6-e CV 517 AND CV 518.
- f.
Adjust FC 1115 A, B AND C to establish maximum total flow to RCS while maintaining spray flow.
- g.
Go to step 13.
10 of 12
501-1.2-14 RESPONSE TO INADEQUATE CORE COOLING REV 0 STACTION/EXPECTED RESPONSER NOT OBTAINED 12 Establish Alternate Low Pressure RCS Recirculation And Injection Flow Path:
- a.
With RWST level - LESS THAN 12% OR indicated containment sump Tevel - GREATER THAN GRADE MINUS 7 FT.
- b. Start both SI recirc pumps.
- c.
Verify two CC! pump breakers
- c. Manually start CLOSED.
pumps.
- d. Verify one salt water cooling
- d. Manually start pump breaker -
CLOSED.
pump.
- e. Open CV 737 A AND B.
- f.
Verify CV 517
- f. Override AND close AND CV 518 -
CLOSED.
CV 517 ANDMv 518.
- g. Verify one refuel ing water
- g. Manually start pump breaker -
CLOSED.
pump. IF two purps running, THEN stop one pump.
- h. Open MOV 866 A AND B.
- i.
Close MOV 883.
- j. Verify MCV 880 - OPEN.
- j. Manually open valve.
- k. Manually open AND MOV 358 - OPEN.
valves.
- 1. Adjust FC 1115 A, B AND C to establish 3Z GPM total flow to RCS.
11 of 12
501-1.2-14 RESPONSE TO INADEQUATE CORE COOLNG REV 0 0 STP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 13 Check Core Cooling:
- a. Core exit TCs -
LESS
- a. IF greater than THAN LESS THAN 400 OF.
TU0 oF, THEN go to step 8 AND verify AND monitor conditions esfablished.
CAUTION Do not pr.oceed to step 14 until alternate low pressure RCS injection flow has been verified.
14 Stop Any Running RCPs:
- a. Trip RCP.
15 Subsequent Action:
- a.
Go to SO-1.2-1.1, LOSS OF REACTOR COOLANT, step 16.
-END H. E. MORGAN
- MANAGER, STATI0N OPERATIONS 12 of 12