ML20204K011
| ML20204K011 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Haddam Neck, 05000000 |
| Issue date: | 06/03/1988 |
| From: | CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | |
| Shared Package | |
| ML20204H467 | List:
|
| References | |
| FR-P.1, NUDOCS 8810250318 | |
| Download: ML20204K011 (12) | |
Text
JUN 0 31988 butBER 1TTIE REY. ISSLTJDAE l
FR P.1 RESPONSE TO IMMINENT PRESSURIZED Rev. 4 THERMAL SHOCK CONDITION
(
l A.
PURPOSE nis procedure pmvides actions to avoid, or limit, thermal shock or pressurized thermal shock to the reactor pressure vessel, or overpressure conditions at low temperature.
B.
SYMPTOMS OR ENTRY CONDITIONS This procedure is entered from F-0.4, INTEGRITY Critical Safety Function Status Tree on a RED or ORANGE condition.
Page 1 of 12 801025031e coloo7 DR ADOCK 05000213 p
JUN O 31988 I
NUMBER TTIII REV. ISSUE /DATE F R.P.1 RESPONSE TO IMMINENT PRESSURIZED Rev.4 THERMAI.. SHOCK CONDITION
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STEP ACTION /EXPEC7ED RESPONSE RESPONSE NOT OBTAINED 1
CHECK RCS COLD LEG 1RY TO STOP RCS COOLDOWN:
TEMPERARJRES STABLE E INCREASING
- a. Verify atmospheric vent valve is closed.
- b. Verify condenser steam dump valves
- closed,
- c. E any SG pressure is decreasing in an uncontrolled manner M any SG is completely depressurized, TiiEN isolate faulted SG(s):
o Isolate all feedwater unless necessity for RCS temperature control.
o Verify main steamline isolation and bypass valves closed.
dose steam supply valves to turbine o
driven AFW pump.
Maintain total feedwater flow greater than 320 GPM until wide range levelin at Ieast one nonfaulted SG is greater than 63 %
(67 % for adverse containment),
- e. E a faulted SG is necessary for RCS temperature control, THEN control feedwater flow at 25 GPM to that SG.
t
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Page 2 of 12
JUN 0 31988 NIAGER Tm.E REV. lSSUE/DATE FR P.1 RESPONSE TO IMMINENT PRESSURIZED Rev. 4 l
THERMAL SHOCK CONDITION l
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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 2
CHECK POWER AVAILABLE TO RESTORE POWER TO PRZR PORY PRZR PORY BLOCK VALVES BLOCK VAVLES.
F 7
CAUTIONt IF ANY PRZR PORY OPENS BECAUSE OF HIGH PRESSURE, STEP 3 b SHOULD BE REPEATED AFTCR PRESSURE DECREASES TO LESS THAN 2350 PSIO.
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3 CIIECK PRZR PORVs AND PRZR LOW TEMPERATURE OVER PRESSURE PROTECTION RELIEF VALVES NOT OPEN:
- a. Check PRZR pressure -
- a. Verify at least one PRZR PORV open.
LESS TIIAN 2350 PSIG Continue with step 4.
WHEN PR7R pressure is less than 2350 PSIG, THEN do step 3 b.
- b. Check PRZR PORVs CLOSED
- b. Manually close PORVs.
E any valve can EQI be closed, BfEN nunually close its block valve. !
- c. Check RCS pressure -
- c. E LTOP relief valves NQIin service, LESS TliAN 380 PSIO DIEN QQIQ Step 4.
E LTOP relief valves in service, DIEN check open isolation valves, PR MOV 5%, PR MOV 598, PR MOV 597, PR MOV 599.
Continue with step 4.
WHEN RCS pressure is less than 350 PSIO, DIEN do step 3 d.
- d. Check LTOP relief valves closed by
- d. Identify and isolate stuck open performing the following:
LTOP relief valve.
o Check acoustic monitor -
NOTIN ALARM Page 3 of 12
JUN 0 31988 NUMBER mu REY. lSSUE/DATE FR P.1 RESPONSE TO IMMINENT PRESSURIZED Rev.4 THERMAL SHOCK CONDITION
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S17.P ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINT.D 4
CHECK IF SIIS IN SERVICE:
QDIQ STEP 9.
o Check HPSI ps -
ANY R 5
CHECK IF SI CAN BE TERMINA*ED:
DO NOT STOP SI PUMPS.
PERFORM WE FOLLOWING:
o Check RCS subcooling based on core exit thermocouples -
GREATER THAN 82* F THEN start one RCP:
(SEE OPPOSIE PAGE FOR ADVERSE CO?CAINMENT)
- a. Place a jumper across designated terminals on # 2 horizontal terminal o Check RVLIS alenum indication -
board in upper RCP breaker GREATER TF AN 15 %
cabinet:
RCP Terminal #
Wire #
1 8 to 9 Pl71P2 to Pl71P4 2
8 to 9 P172P2 to Pl72P4 3
8 to 9 Pl73P2 to P173P4 4
8 to 9 Pl74P2 to P174P4
- b. Start oil lift pump.
(scal water return trip valves)
- e. Open seal water retum MOV.
- f. Start selected RCP.
- 2. QQIQ Step 19.
Page 4 of 12
JUN 0 31988 NUMBER Tm.E REV. ISSUE /DATE I
F R.P.1 RESPONSE TO IMMINENT PRESSURIZED Rev.4 i
TilERMAL SIIOCK CONDITION l
STEP ACI1ON/ EXPECTED RESPONSE RESPONSE NOT OBTAINTD r
1 CAUTION:
o IF OFF SITE PO%'ER IS LOST AFTER 51 RESET, AIANUAL ACTION AfAY BE REQUIRED TO RESTART SAFEGUARDS EQUIPhiENT.
o IF CONTROL SH' ITCH FOR ANY SHUTDOH'N CHARGING PUhfP %'AS TAKEN TO THE TRIP POSITION, THE PUhfP(S)
AfAY AUTO START %' HEN BOTH SI %'L RELAYS ARE RESET.
L J
6 RESET SI AND CONTAIh3 TENT ISOLATION:
- a. Check containment pressure -
- a. Perform the following:
LESS TliAN 5 PSIG
- 2. Reset SI WL Relays.
- 3. IE charging pump control switch (es) are EQIin TPO, THEN restore low discharge pressure auto start for shutdow11 charging pump (s) by taking pu,mp control switch (es) to the 'Tnp position then releasing switch (er) to the "Auto" position.
- 4. QQIQ Step 7.
- b. Reset SI and containment isolation (SEE OPPOSITE PAGE) l 7
CilECK CONTAINMENT START ONECONTAINMENT l
INSTRUMENT AIR PRESSURE -
INTRUMENT AIR COMPRESSOR GREATER TIIAN 118 PSIO TO ESTABLISH INSTRUMEb7 AIR PRESSURE.
I l
a Page 5 of 12
cA%nererwkw NUMBER TTIU REV. ISSUE /DATE F R.P.1 RESPONSE TO IMMINENT PRESSURI7,ED Rev.4 THERMAL SHOCK CONDITION STEP ACTION /EXPECIED RESPONSE RESPONSE NOT OBTAINED 8
STOP SI PUMPS AND PLACE IN STANDBY:
o LPSIpumps o HPSIpumps o All but one charging pump 9
VERIFY SIILOW NOT REQUIRED:
MANUALLY OPERNR! St PUMPS AS NECESSARY.
o Check RCS subcooling based on core exit thermocouples -
GREATER THAN 32' F THEN start one RCP:
(SEE OPPOSITE PAGE FOR ADVERSE CONTAINMENT)
- a. Place ajumper across designated temu'nals on # 2 horizontal terminal o Check RVLIS lenum indication -
board in upper RCP breaker GREATER 15 %
cabinet:
RCP Terminal #
Wire #
1 1 8 to 9 Pl71P2 to Pl71P4 2
8 to 9 Pl72P2 to P172P4 3
8 to 9 Pl73P2 to Pl73P4 4
8 to 9 Pl74P2 to Pl74P4
- b. ' Start oil lift pump.
(scal water retum : rip valves)
- e. Open seal water retum MOV.
- f. Start selected RCP.
- 2. GQIQ Step 19.
Page 6 of 12
JUN 0 31988 NUMBER TTILE REV. ISSUE /DATE FR P.1 RESPONSE TO IMMINENT PRESSURIZED Rev.4 THERMAL SHOCK CONDITION
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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 10 CHECK RCS HOT LEG E INCREASING,
'EMPERATURES STABIE DIEN CONTROL FEEDWATER FLOW AND STEAM FLOW AS NECESSARY TO ESTABLISH STABLE RCS HOT LEG TEMPERATURES.
E DECREASING, 111EN VERIFY ACTIONS OF STEP 1 i HAVE BEEN PERFORMED BEFORE CONTINUING WITH THIS PROCEDURE.
11 DEPRESSURIZE RCS TO DECREASE RCS SUBCOOLING:
- a. Use nonnal spray
- a. E normal spray EQIavailable, THEN use one PRZR PORV.
E necessary manually operate SI pumps to maintain RCS subcooling smter than value listed in Step 9.
E RCS can EQIbe depressurized I
using any PRZR PORV, THEN use auxiliary spray,
- b. Depressurize RCS until either one of the following conditions is satisfied:
o RCS subcooling based on core exit thermocouples -
LESS 'IT{AN 42' F (SEE OPPOSITE PAGE FOR ADVERSE CONTAINMENT) 2 o PRZR level -
GREATER THAN 82 %
(63 % FOR ADVERSE CONTAINMENT)
- c. Stop RCS depressurization Page 7 of 12
JUN 0 31988 NUhGER TTIU REY. ISSUE /DATE I
F R.P.1 RESPONSE TO IMMINENT PRESSURIZED Rev.4 l
THERMAL SHOCK CD iDITION
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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED r
1 CAUTION:
AN INCREASE IN RCS PRESSURE MAY RESULT IN EXCESSIVE REACTOR VESSEL STRESS. RCS PRESSURE AND TEMPERATURE SHOULD BE MAINTAINED STABLE WHILE PERFORMING SUBSEQUENT STEPS IN THIS PROCEDURE.
L J
12 CHECK PRZR LEVEL TRY TO RESTORE LEVEL WITH GREATER THAN 15 %
CHARGING FLOW WHILE (35 % FOR ADVERSE MAINTAINING STABLE RCS CONTAINMENT)
PRESSURE.
LE LEVEL CAN EQI BE RESTORED, THEN QQIQ STEP 18.
13 CHECK VCT MAKEUP CONIROL SYSTEM:
- a. Check VCT nukeup blender ratio.
BORON CONCENIRATION
- b. Check VCT nukeup controls -
- b. Place makeup contmls in automatic.
IN AUTOMATIC 14 ESTABLISH NORMAL LETDOWN IE CONTA!NMENT PRESSURE IS (SEE OFf0 SITE PAGE)
LESS THAN 5 PSIG, DIEN ESTABLISH ALTERNATE LETDOWN BY PERFORMING THE FOLLOWING:
- 1. Reset Containment HCP WL Relays.
- 2. Open DH TV 1841. drain header trip valve.
- 3. Reset solenoid in blowdown room for drain header trip valve, DH TV 1847.
- 4. Une up drain header to VCT:
- a. Close Dil.V-408, drain header to PDT.
- 5. Close tweaker for DH MOV 310.
- 6. Open one loop drain MOV.
- 7. Thronje Dil MOV 310 to nuintain PRZR level.
Page 8 of 12
JUN 0 31988 NUMBER Tm2 REV. lSSUE/DATE F R. P.1 RESPONSE TO IMMINENT PRESSURIZED Rev.4 THERMAL SHOCK CONDITION
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STEP ACT10N/EXPECIED RESPONSE RESPONSE NOT OBTAB'ED 15 ALIGN CHARGINO PUMP SUCTION TO VCT:
- b. Close BA MOV 373
- c. Check BA MOV 32-CLOSED
- c. Close BA MOV 32 16 CHECK PRZR LEVEL CONTROLCHARGINO AND LESS ~'IAN 82 %
LETDOWN FLOW AS NECESSARY (63 % ' UR ADVERSE TO RESTORE PRZR LEVEL.
COSTAINMENT)
E NECESSARY ESTABLISH ALTERNATE IEIDOWN.
17 CONTROL PRZR PRESSURE:
- a. Tum on PP2R heaters and operate
- a. E normal spay NQIavailable nonnal PRZR spray as necessary AND letdown is in service, to maintain pressure stable DiEN use auxiliary spray.
E letdown HQIin service, THEN use one PRZR PORV.
I8 CHECK RCS SUBCOOLINO BASED RETURNIQ STEP 11.
ON CORE EXIT DIERMOCOUPLES AT 42' F (SEE OPPOSITE PAGE FOR ADVERSE CONTAINMENT) 1
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Page 9 of 12 l
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l JUN 0 31988 NUMBER mLE REY. ISSUE /DATE FR P.1 RESPONSE TO IMMINENT PRESSURIZED Rev. 4 TilERMAL SHOCK CONDITION
(
STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAlhTD r
7 CAUTION:
AN INCREASE IN RCS PRESSURE SfAY RESULT IN EXCESSIVE REACTOR VESSEL STRESS. RCS PRESSURE AND TESfPERATURE SHOULD BE AfAINTAINED STABLE WHILE PERFORSilNG REACTOR VESSEL TEh!PERATURE SOAK.
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19 DETERMINE IF RCS TEMPERA'111RE SOAK IS REQUIRED:
- a. Cooldown rate in RCS cold legs -
a QQIQ Step 20.
GREATER THAN 100* F IN ANY 60 MINUTE PERIOD
- b. Perform the following:
- 1. Do NOT cooldown the RCS until temperature has been stable for one hour
- 2. Do NOT increase RCS pressure during that time
- 3. Perform actions of other procedures in efrect that do NOT cooldown DR increase RCS pressure until RCS temperature soak has been completed
- 4. RCS cooldown is permitted after one hour *d complete
- 5. Maint.
. CS pressure and cold leg temLera_tures within limits of Figure FRP1 1.N QR Figure PRPI 1.A
- 6. Maintain cooldown rate in RCS cold legs less than 50' F in any 60 minute period.
20 RETURS10 PROCEDURE AbV STEP IN EFFECT Eb3 e
Page 10 of 12
JUN 0 31988 NUMBER EU REV. ISSUE /DAH l
FR P.1 RESPONSE TO IMMINENT PRESSURIZED Rev.4
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THERMAL SHOCK CONDITION
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2600
-/
/
/
/
24m
/
/
/
)
2200
/
/
/
/
20m
/
/!
1800
[
OPERATING
/
INDICATED
/
ZOhT f
REACTOR 1600 2
COOLANT
[
[
PRESSURE
/=
/
( PSIO) 1400
/
/
1200-
/
/
/
/
1000 g
j
/
/
sw
/
/
a
)
/
/
/
a
/
/
200 200 300 400 500 600 700 INDICATED REACTOR COOLANT TEMPERNRJRE (* F )
FIGURE FRPI 1.N POST SOAK COOLDOWN LIMR' NORMAL CONTAINMENT l
Page 11 of 12
JUN 0 31988 b W BER EU REY. ISSUEAR
}
F R.P.1 RESPONSE TO IMMINENT PRESSURIZED Rev.4 THERMAL SHOCK COT 1DITION I
-h.
2600 1
.i 2400
.4 "OPERATINO
/
...,/
ZME f
2200
<-.... I
/
.]
I I
2M I
i i
i INDICATED
/
/
REACTOR 1600 f
f COOLANT I
1 PRESSURE
/-
/
( PSIG) 1400 j
/
/
1200 j
j
/
/
/
/
/
/
800
/
I l a
)
400 200 200 300 400 500 600 700 INDICA *ED REACTOR COOLANT M8.PERATURE (
- F )
FIGURE FRPI 1.A POST SOAK COOLDOWNIAi!T ADVERSE CONTAINMENT Page 12 of 12