ML20135H803

Rev 1 to Procedure CP.103 Re Transient Termination Following Occurrence That Leaves RCS Saturated w/once-through Steam Generators Removing Heat

ML20135H803
Person / Time
Site:	Rancho Seco
Issue date:	05/29/1985
From:	SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML20135H794	List: ML20135H793 ML20135H797 ML20135H800 ML20135H803 ML20135H807 ML20135H809 ML20135H812
References
CP.103, TAC-57558, NUDOCS 8509240244
Download: ML20135H803 (4)

Text

05-29-85 Rev. 1 WP0011F

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0-0058P CP.103 TRANSIENT TERMINATION FOLLOWING AN OCCURRENCE THAT LEAVES THE RCS SATURATED WITH OTSG(S) REMOVING HEAT

.l.0 VERIFY THAT HEAT TRANSFER IS BEING CONTROLLED.

.1 Verify maximum HPI flow (Rule 1).

.2 Raise SG. levels to 95% on the operate range.

2.0 lE THE CORE FLOOD TANKS ARE EMPTYING, THEN GO TO CP.101.

3.0 ENSURE THE CFT ISOLATION VALVES (HV-26513 AND HV-26514) REMAIN OPEN.

4.0 BEGIN COOLDOWN OF RCS.

.1 Increase OTSG steaming by opening the TBVs or ADVs.

.2 Verify that OTSG continue to provide heat sink for the RCS by:

.1 Remaining pressurized ANO

.2 Incore T/C temperature decreases as OTSG pressure is' lowered.

.3 Continue saturated cooldown by decreasing OTSG pressure.

.4 If the RCS does not cooldown as the OTSG are depressurized, THEN bump a RCP to reestablish heat transfer via natural circulation.

5.0 (( HEAT TRANSFER TO THE OTSG(S) CANNOT BE MAINTAINED, THEN GO TO CP.104 6.0 [E THE RCS SUBC00 LED MARGIN IS RESTORED, THEN START ONE RCP.

.1 Determine that both incore T/Cs and hot leg RTDs indicate subcooled conditions.

.2 If only one OTSG is available then start one RCP in that loop, otherwise start RCP B or D.

8509240244 850919 PDR ADOCK 05000312 p

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j r-t 7.0 1E THE RCS REMAINS SU8C00 LED AFTER STARTING THE RC PUMP, START A SECOND I

RCP; THEN GO TO CP.105, OTHERWISE CONTINUE.

8.0 IF FOR ANY REASON THE RCS BECOMES SUPERHEATED, THEN GO TO ICC SECTION

P i E.07.

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9.0 1[ THE RCP(S) CANNOT BE STARTED,- AND JHE SU8C00 LED MARGIN IS RESTORED

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- DURING THE NATURAL CIRCULATION C00LDOWN,1THEN GO TO CP.105,: OTHERWISE.

n! : 7 CONTINUE.

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10.0 WHEN THE CORE FLOOD TANK LEVELS DECREASE TO ZERO FT INDICATED,ETHENlRACK I

IN BREAKERS 20228 AND 20229 AND CLOSE CFT' ISOLATION VALVES HV-26513 AND.i inti,G j,

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1 HV-26514 TO PREVENT NITROGEN INTRODUCTION INTO.THE RCS,.

l r LPI/0HS COOLDOWN IS TLEr~ a,,

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11.0 SELECT LPI/0HS OR NATURAL CIRCULATION C00LDOWN.

SELECTED,' THEN GO TO STEP 13.0, OTHERWISE CONTINUE WITH OTSG COOLING.

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12.0 WHEN RCS DEPRESSURIZES TO L;d5 THAN _150 PSIG, THEN 'CLOSE ALL HIGH POINT fl{gl "r j'

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VENT VALVES (HV-20533. HV-20534, HV-20579, HV-20580, HV-21528,m and veni un 1; ;[

HV-21522), EMOV and EMOV Block.

37-2.52.

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.1 Prior to RCS being cooled to 280*F and 250 psig, sample the primary

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coolant for isotopic analysis and notify the Plant Superintendent of ir o e results before placing the LPI/0HS in service.

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.2 With RCS parameters stable, do not shift LPI suction to the sump until 3-the decision has been made to complete cooldown with LPI/0HS. Alternate a r

cooldown method can be in accordance with OP B.4, Section 6 Natural o i un p

Circulation Cooldown.

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13.0 WHEN LPI FLOW HAS BEEN IN EXCESS OF 1000 GPM IN EACH INJECTION LINE FOR t,

AT LEAST 20 MINUTES, STOP HPI PUMPS AND CONTINUE, OTHERWISE, GO TO STEP, -

16.0.

14.0 TRANSFER LPI SUCTION TO RB SUMP.

.1 WHEN the BWST lo-lo-level alarm actuates (minimum time 1/2 to I hour),

t THEN transfer LPI suction to RB sump within 4 minutes of receipt of alarm.

a.

Open valves HV-26105 and HV-26106 to supply heter from the RB

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emergency sump to the DH suction header.

b.

Close valves STV-25003 AND SFV-25004 to isolate the BWST.

Rev. 1 CP.103-2 o

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14.1 c.

' E OH high flow alarm is received, THEN throttle valves SF-26039

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(Loop A) and SFV-26040 (Loop B) to below 3000 gpm per pump to

. prevent pump runout.

15.0 GO TO STEP 18.0' t.i ~

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16.0 E THE CONDITIONS OF STEP 13.0 ARE NOT MET BEFORE THE BWST LO-LO-LEVEL 3.

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' ALARM ACTUATES (MINIMUM TIME 1/2 TO 1 HOUR), THEN:

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.1 I Align one _ HPI pump to take suction from the R8 Sump using the.LPI'. i., ils Id system to provide HPI suction, m ~ i l j*

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.2 Stop second HPI pump if running.

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.3' On BWST lo-lo-level, shift one HPI pump suction from the BWST to f-

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the operable DHS pump discharge.

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.4 Align the operable OHS pump suction to the RB sump in accordance

> f r 'I with OP A.8, Section 4.2.

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17.0 ESTABLISH CONDITIONS FOR LPI COOLING.

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.1 Continue HPI/LPI " piggyback" mode until RCS pressure is 250 psig.

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.2 Maintain 250 psig and continue cooldown until adequate subcooling margin t at, o t i(

is established.

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18.0 WHEN ADEQUATE SUBC00 LING MARGIN IS ATTAINED, THEN ESTABLISH LPI/0HR

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COOLING.

.1 IfF, two decay heat trains are operable, THEN continue with Step '18.5.

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. k only one decay heat train is operable, THEN continue with Step 18.2.

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.2 WHEN the HPI/LPI piggyback operation has been supplying at least 1000

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gpm to each loop for,20 minutes AND, during this time the RCS pressure., :

j has been less than the maximum pressure for LPI operation alone, THEN:

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.1 Verify that the LPI to RCS valves (SFV-26005 and -26006, are open.

.2 Establish normal makeup as required.

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.3 Close LPI to HPI valves (HV-26007 and -26008).

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.3 When two OH systems are operable, THEN follow Steps 18.5 through 18.6.

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.4 Until two OH systems are operable, continue with Step. 18.8 j

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CP.103-3 l.

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l CAUTION:

00 NOT ESTA8LSH A FLOW PATH IN ANY SYSTEM ISOLATED BY THE SFAS WITHOUT i

REVIEW Of THE POTENTIAL RELEASE Of RADI0 ACTIVE GAS OR LIQUID.

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18.5 Open the DH Loop A suction manual isolation from reactor vessel valve' i

HV-20005.

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.6 Establish core cooling with the LPI Loop 'lin'the DHS mode in accordance '

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'CE li with OP A.8, Section 4.

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.7 WHEN DH system flow has been gr'eaterlthan 1000'gpm in each line for at' -

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i least 20 minutes, THEN:

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.1 Trip'RCPs if running, j

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.2 Establish'both LPI systems, in DHR mode,

.3 Establish overpressure protection.

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.8 Maintain seal water flow to all RCPs in anticipation of innedtate t'

restart should LPI flow be interrupted (one RCP/ loop if required).

NN Should RCP restart be required, use the bump start.

l 19.0 CONTINUE COOLDOWN ON LPI. SYSTEM.

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.1 When on DHR flow, core AT 15 monitored by comparing DHR pump inlet and c

cooler outlet temperature or incore thermocouples and cooler outlet 3

temperatures.

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NOTE:

If OHR pump inlet and cooler outlet temperatures are not i --

available, use RCS thermocouples (incure and loop) to j

prevent exceeding cooldown limits.

.2 Continue RCS cooldown to 140*F with core cooling provided by OHR and RCS 1

i pressure controlled by HPI and/or pressurizer control.

.3 If LPI flow is interrupted AN_0 RCPs are not available, THEN continue RCS cooldown in accordance with OP B.4, Section 6.

.4 With core cooling provided by LPI, place OTSGs in wet layup as j

conditions permit. Stop AFW pumps. Ensure at least one AFW pump is 1

available for restart.

.5 _If_ adequate subcooling margin is lost, THEN align one LP! pump to BWST i

or RB sump. Maintain maximum flow until adequate subcooling margin is regained.

20.0 ESTABLISH LONG TERM COOLING PER CP.101, STEP 7.0.

i END Rey. I CP.103-4 i

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