ML20135H807

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Procedure CP.104 Re Transient Occurrence That Leaves RCS Being Cooled by HPI Cooling
ML20135H807
Person / Time
Site: Rancho Seco
Issue date: 04/12/1985
From:
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML20135H794 List:
References
CP.104, TAC-57558, NUDOCS 8509240249
Download: ML20135H807 (3)


Text

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04-12-85

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0-0058P CP.104 TRANSIENT TERMINATION FOLLOWING AN OCCURRENCE THAT LEAVES T R i?J l

THE RCS BEING COOLED BY HPI COOLING i

t 1.0 IF THE RCS IS SATURATED,, THEN ENSURE, MAXIMUM.HPI FLOW.

1.6 IE ILE It, {;

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.1 Rule 1.

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2.0 OPEN OR VERIFY OPEN EMOV (PSV-21511) AND EMOV 8 LOCK VALVE '(HV-21505): bra u i

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3.0 (( FOR ANY REASON THE RCS BECOMES SUPERHEATED,.THEN GO TO ICC SECTION ;I[ TEi E.07.

i : rt.

!,It 4.0 WHEN THE RCS SU8C00 LED MARGIN IS ESTABLISHED.-THEN;

([C -[L 1: !' .1 Start a RCP AND 1 !... t,;,. + I .2 Control HPI per Rule 2. ..? - Q t r cu i J ( t 5.0 If THE RCS IS SATURATED, THEN (NSURE THE CFTs VALVES REMAIN OPEN. - ' :j_ ~ 6.0 IF THE RCS SU8C00 LED MARGIN IS ESTABLISHED AND THE RCS DEPRESSURIZATION. IS BEING CONTROLLED, THEN ISOLATE THE CORE FLOOD TANKS. ~ L .1 WHEN the RC system pressure reaches 675 to 700 psig, THEN rack in ,t

c breakers 20228 and 20229 AND close the core flood isolation valve (HV-26513 and HV-26514).
,. c-: t '

.2 Rack out breakers 20228 and 20229 and tag in accordance with OP A.4.; ~ 7.0 IF,AT ANY TIME: .1 THE INCORE T/Cs INDICATE THAT THE RCS SU8C00 LING MARGIN IS REESTABLISHED, WITH FW AND SGs STILL AVAILABLE BUT VOIDS ARE TRAPPED IN,HIGH POINTS OF (

LOOPS, OR

.2 FW TO OTSGs IS RESTORED AFTER ENTERING CP.104 WITHOUT FW, THEN FOLLOW STEPS 9.0 THROUGH 14.0. ( CP.104-1 8509240249 850919 ADOCK 0%g2 PDR P l

1, 8.0 GO TO CP.103, STEP. 8 0. ( 9.0 ESTABLISH CONDITIONS NEEDED TO RE' STORE HEAT TRANSFER. i .1 E the RCS is NOT subcooled using core exist T/Cs OR_ hot leg RTDs, THEN i i ensure maximum HPI flow. v r -.2 IF NO RCPs are running, THEN try to get 'at least one RCP ready for bump.': i .3 Ensure that SG 1evels are being maintained at.95 percent on the operate' ~ (' t. i m range. l 10.0 E A 'ANY TIME, WHILE PERFORMING STEPS 11.0 THROUGH 14.0, NATURAL >.9 ~ ' i CIRCULATION IS REGAINED, THEN ~C> 1' .1 E the RCS is subcooled as indicated by both incore T/Cs and hot leg RTDs THEN go to CP.105. ( i .2 E the RCS remains. saturated, THEN go to CP.103. j T .1 ' Natural circulation is verified by: 'a O .1. T ot and IC T/Cs (average of 5 highest) indicate subcooling }. h

and decreasing.

.2 ' ' Primary IC T/C temperature decreases when secondary pressure (.' .c is decreased. i 11.0 LOWER OTSG PRESSURE TO INDUCE HEAT TRANSFER. il .1 Lower OTSG pressure by adjusting TBVs or ADVs, while maintaining OTSG t' t: level, until secondary Tsat is 40* to 60*F lower than core exit thermocouple temperature. Maintain this OTSG pressure. t 12.0 E RCPs CANNOT BE BUMPED, THEN CONTINUE COOLDOWN WITH STEP 1.0 THROUGH f 8.0 0F THIS SECTION. i 13.0 USE PUMP BUMPS TO INDUCE HEAT TRANSFER. .1 Determine RCP operability per OP A.2. .2 Bump a RCP, which is capable of being started, in a loop with OTSG level i at the low level limit or greater. t .3 Allow RCS pressure to stabilize within !20 psig. 9 CP.104-2 .f I i

,c!' i l 4 I 13.4 Repeat Steps 13.2 through 13.3 for operable RCPs that have not been : - I bumped. Allow 15 minutes between pump bumps. E all operable RCPs have been bumped and heat transfer HAS. N.O.T. been reestablished, THEN continue '. ' a' s with Step 14.0.

P, '

4 14.0 FURTHER LOWER OTSG PRESSURE T0 INDUCE HEAT TRANSFER. < 5.. t - e e... e - s eL f t t, } l- .1 E at least one hour has passed since",reactorltrip and 'any RCPs are .i 2L 2 h capable of being started, THEN start'and run one RCP, preferably in a sax: ! t: i -loop with OTSG level greater than 24".r ~s - A W. (, ~ g -~ w 2, g ^ 15.0 E RCS MAINTAINS SUBC00 LING MARGIN,~ HEN 'GO TO CP.105.' IF RCS REMAINS' iSCS i SATURATED, THEN CONTINUE C00LDOWN PER STEPS 1.0 THROUGH 8.0. 9.!D:6 t i j. e 9 [: e f-t 1 i l i i t ~.1 ' } i (' l l 1 ~ l i ? i } i' l I i r i 1 4 END i e ( CP.104-3 I, i e.}}