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 0-0058P

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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 ,

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, 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. s

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A 9.0 1[ THE RCP(S) CANNOT BE STARTED,- AND JHE SU8C00 LED MARGIN IS RESTORED ~~ "G!n TT &

- DURING THE NATURAL CIRCULATION C00LDOWN,1THEN GO TO CP.105,: OTHERWISE. n! : 7 j

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CONTINUE. ,

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

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

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

441 ,

P. J E : 1 11.0 SELECT LPI/0HS OR NATURAL CIRCULATION C00LDOWN. j_ l r LPI/0HS COOLDOWN IS TLEr~ a , ,

SELECTED,' THEN GO TO STEP 13.0, OTHERWISE CONTINUE WITH OTSG COOLING. ..h t EcP ', ,

12.0 WHEN RCS DEPRESSURIZES TO L;d5 THAN _150 PSIG, THEN 'CLOSE ALL HIGH POINT fl{gl "r j' 1+* 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. .c i

.1 Prior to RCS being cooled to 280*F and 250 psig, sample the primary .4 ; e ( .o ,

coolant for isotopic analysis and notify the Plant Superintendent of --

ir o e results before placing the LPI/0HS in service. r -! m 4

.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. a i 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 [

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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4. ..

s 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.

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15.0 GO TO STEP 18.0' -

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

' ALARM ACTUATES (MINIMUM TIME 1/2 TO 1 HOUR), THEN: . -:,& ,,3]:

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

h the operable DHS pump discharge. . 1 i

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

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

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17.0 ESTABLISH CONDITIONS FOR LPI COOLING. ~ . ' E 31lE T'I U

.1 Continue HPI/LPI " piggyback" mode until RCS pressure is 250 psig. . , te r t u ; 2

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

is established. f- - !i p 18.0 WHEN ADEQUATE SUBC00 LING MARGIN IS ATTAINED, THEN ESTABLISH LPI/0HR

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i COOLING.

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

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

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

) 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: r- -

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

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s .2 Establish normal makeup as required. .

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

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

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.4 Until two OH systems are operable, continue with Step. 18.8 j 1

1 i Rev. I

{( CP.103-3 ,

4 l.

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(. l CAUTION:

00 NOT ESTA8LSH A FLOW PATH IN ANY SYSTEM ISOLATED BY THE SFAS WITHOUT i .10 '

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. >* ,

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

with OP A.8, Section 4. <

'CE li

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1: .7 WHEN DH system flow has been gr'eaterlthan 1000'gpm in each line for at' - "' l-i least 20 minutes, THEN: , < - i j .1 Trip'RCPs if running, -

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

. .3 Establish overpressure protection.  ! -e' i

.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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I .1 When on DHR flow, core AT 15 monitored by comparing DHR pump inlet and c 'k 3

cooler outlet temperature or incore thermocouples and cooler outlet '

j temperatures.

• j 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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