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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WF0012F .

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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 '

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!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. ,e ,i / W i.

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

1 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; ,

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       .1    Start a RCP AND                        +
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       .2    Control HPI per Rule 2.                                                  *
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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. *

                                                                                                                    ~

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       .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 , PDR ADOCK 0%g2 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
  • Ensure that SG 1evels are being maintained at.95 percent on the operate'
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                .3                                                                                                     ('                t.

range. ,

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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. ,' . (

                  .2 E the RCS remains . saturated, THEN go to CP.103.             ,

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                                                                                                                                      . i
                      .1   ' Natural circulation is verified by:                                                          O        '
                                                                                                                                         'a
                            .1.        Th ot and IC T/Cs (average of 5 highest) indicate subcooling                        .
                                                                                                                                         }.
and decreasing.
                            .2 ' ' Primary IC T/C temperature decreases when secondary pressure is decreased.                                               .

(.' .c 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 ,

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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 '. ' s a'

 ;                                   with Step 14.0.                                                                                                               : P, '

4 f t 14.0 FURTHER LOWER OTSG PRESSURE T0 INDUCE HEAT TRANSFER. < 5 .. t - e e. . . e - s eL t, ,

                                                                                                                                                                                     }

l- .1 E at least one hour has passed since",reactorltrip and 'any RCPs are .i 2L 2 h i capable of being started, THEN start'and run one RCP, preferably in a sax: *

                                                                                                                                                                                 ! t:
                                    -loop with OTSG level greater than 24".r ~s -

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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

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END i

e ( ,, CP.104-3 i I,

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