ML20085A533
| ML20085A533 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/08/1979 |
| From: | Newton D BABCOCK & WILCOX CO. |
| To: | |
| References | |
| TASK-01, TASK-02, TASK-07, TASK-1, TASK-2, TASK-7, TASK-GB GPU-0496, GPU-496, PROC-790408, NUDOCS 8307060558 | |
| Download: ML20085A533 (4) | |
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.',SABC0CK & WILCOX C01.!PANY
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From D. G. NEWTON File No.
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B&W OPERATIfiG PLAtlT
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/DateAPRIL 8,1979-12:57 A.
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OPERATIftG INSTRUCTIONS FOR STUCK OPEN PORY j
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.9 I PREPARED ATTACHED IS THE WRITE UP.YOU REQUESTED SATURD
,,. j THE WRIT UP FOLLOWING A DISCUS $10tl WITH B. M. DUNN
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....7 GEISSLER #10 M. V. B'0'itACA. HOWEVER, THE' WRITE UP HAS N
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I WAS GOING TO HAVE J. D. CARLTON REVIEW IT w.
BY ANYBODY.
- 2.@Cb, I WOULD RECO2dEt;D HAVING THE RESPONSE REVIEW NIGHT.
SOMEONE FROM THESE UNITS SHOULD.
~2C l-h ANALYSES AtiD SAFETY #tALYSES.
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TOMORROW.
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7 THE OPERATOR ACTIONS ARE SPECIFIC SUT
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ANALYSES TO IMPROVE PLANT. RELIABILITY.
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INTRODUCTION _
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. i /;n ITEM 3 0F I.' E. BULLETIN !;0. 79.d5 REQUESTS UTILITIES.W
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IE BULLETIN WAS INSTIGATED BY THE NU
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DURING THIS INCIDENT THE POWER OPE
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OPENED #:0 FAILED TO RECLOSE.' CO
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DETERMINED THE PORV HAD FAILED OPE
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THE FOLLOW!?;G INFORMATI0ft IS PROVID'ED FOR kD THE VALVE.
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.I REQUIRE'O FOR A STUCK OPEN PORV.
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DESIGft FUNCTIO!! 0F THE PORV OVER PRESSURE PROTECTION OF THE RCS IS PROVIDED BY TWO CODE SAFETY VALVES ON
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THE PRESSURIZER. Ti!E ASME CODE REQUIRES THAT THE$,E VALVES CAN NOT BE ISOLATED.
s CONSEQUEtlTLY, IF ONE OF THESE VALVES FAILED OPEN A LOCA WOULD RESULT SINCE THE L
L F-1 THEREFORE; IT IS PRUDENT TO LIMIT THE NuttBER OF-r LEAK COULD fl0T BE ISOLATED.
I TIMES THE CODE SAFETY VALVES WILL BE OPENED. THIS IS ACCOMPLISHED BY i
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PROVIDING A PORY WITH A LOWER OPENING SET POINT. HOMEVER, THE FORV MAY ALSO t
1 FAIL OPEN. BUT SINCE THE PORV IS NOT REQUIRED FOR OVER PRESSURE PROTECTION I r
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l IT CNI BE ISOLATED. THE ISOLATIO;I IS PROVIDED BY THE RELIEF ISCLATION VALVE u
p LOCATED UPSTREAH OF THE PORV..
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- .h-THE FORY ALSO XEEPS THE RC PRESSURE BELOW THE HIGil RC PRESSURE RE c
SET POINT WHEN AUT0".ATICALLY DECREASING TURSINE GENERATOR LOAD TO PLNR
...4 LOAD FOLLOWING A LOSS OF OFFSITE POWER.
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OPERATOR ACTIO': IF THE PORY FAILS OPEN THE VALVE SHOULD BE ISOLATED BY ' CLOSING THE MOTOR GPERATED ISO
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WHEliEVER THE PORV FAILS OPEN.
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THE OPERATOR SHOULD ALWAYS KEEP IN HIND THAT THE PORY PROVIDES NO SA
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F FUNCTkON AND THEREFORE CNi BE ISbtATED AT ANY TIME WITHOUT JEOP l'.%
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SAFETY OF THE PLANT.
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THE PORY PROVIDES PLANT RELIABILITY. THE PLMIT IS SAFE IF THE FORY F
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OPEN'OR CLOSED OR IF THE CODE SAFETY VALVES FAIL OPEN.
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IF THE RC PRESSURE INCREASES.TO THE PORY SETPOINT AND THEN D y
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EELOW 2000 PSIG THE PORY -SHOULD BE CLOSED.
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IF THE 'RC PRESSURE DECREKIS TO THE HPI ACTUATION PRESSURE THE PORY SH d ' BE CLOSED.
NOTE: THE PORY POSITION IIIDICATOR LIGHTS DO NOT' PROVIDE DIRECT STATUS f'l VALVE POSITION. THE LIGHT INDICATES THE POSITION OF THE SOLEN 0ID
.7 OPERATOR ON THE PORY. THEREFORE. THE INDICATOR LIGHTS MIGHT NOT
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SYPPTO45 0F A STUCK OPEN PORV_
DECREASING RC PRESSURE OR PRESSURIZER LEVEL WITH NO DECREASE IN
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'..v INCREASE IN THE RC DRAIN TN4K LEVEL N;D/OR TEMPERATURE.
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BASES FOR OPERATOR ACTION
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IN PRESSURE FOR PLANT AVAILABILITY..
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-.4 LEVEL OFF BEFORE REACHING A 2000 PSIG RC PRESSURE. IF THE PRESSU
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BELOW 2000 PSIG THE PORY MAY BE STUCK OPEN. HOWEVER THE PORY H
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J08 BY HITIGATING THE INITIAL RC PRESSURE INCREASE PRESUMABLY;AND IS NOT
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.1 THE NEEDED AGAIN 50 IT CAN'BE ISOLATED WITHOUT AFFECTING PLANT OPERATION
-j INCREASING PRESSURE TRANSIENT IS INDICATED BY NI INITIAL PRESSURE
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. c TO OR ABOVE THE PORY SET POINT FOLLOWED BY A REDUCTION IN PRESSURE
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YOR Tills TRA:151EtiT THE ItitTIAL PRESSURE REDUCTIO:1 USUALLY 00 Q
Tile HPI SET PO!!iT. IF' IT DOES, THE PORY MAY BE STUCK OPEN. THIS TYPE OF TRANSIEllT IS I!!DICATED BY l10 INITIAL PRESSURE INCREASE.
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