ML20024B550

Discusses Operating Instructions for Stuck Open PORV

ML20024B550
Person / Time
Site:	Crane
Issue date:	04/09/1979
From:	Kane E BABCOCK & WILCOX CO.
To:	Fairburn G, Womack E BABCOCK & WILCOX CO.
References
TASK-02, TASK-07, TASK-2, TASK-7, TASK-GB GPU-0299, GPU-299, NUDOCS 8307090117
Download: ML20024B550 (1)

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OPERATING !!1STRUCTI0t!S FOR STUCK OPEN POWER OPERATED RELIEF YALVE APRIL 9. 1979 J

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PREVIOUS HD40S ON THIS SUBJECT HAVE IDCITIFIED THE DESIGN FUNCTI0tt OF THE Ii.

PORY AS "QVERPRESSURE PROTECTION OF RCS IS PROVIDED BY TWO C00E SAFETY m'

VALVES ON THE PRESSURIZER. THE ASME CGCE REQUIRES THA THE5E VALVES CANtt07 d

BE ISCLATED. PRUDENT OPERATIOri 0F THESE VALVES DICTATES HITIIHIZItiG THE 7'

- NUMBER OF TIMES THE CODE SAFETY VALVES WILL BE OPENED. THIS IS ACCCMPLISHED

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BY PROVIDING A PORY WITH A LOWER OPENIriG SETPOINT.". PRESENT SETPOIllT FOR THE PCRV FOR CUR 177 FUEL ASSEMBLY PLMT IS ABOUT 2.255 PSIG, WITH REACTOR N

TRIPSETPOINTSABOUT2,}355PSIG. I BELIEVE AS Art INTERIM MEASURE. THE g

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. PROCEDURE SHOULD CGt1TAIN THE REC 0mENDATION THAT THE PORY BE RESET TO y

i-P APPROXIMATELY 2.400 PSIG. RESITTING THE PORY TO A PRESSURE HIGHER THAN REACT 01 TRIP SETPOINT STILL PROVIDES PROTECTION AGAltiST AdUATION OF THE CODE S

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VALVES. IN ADDITION, TO THE BEST OF MY KNOWLEDGE. THE PORY IS NOT

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USED IN SAFETT ANALYSIS CALCULATI0 tis. IttCREASittG THE SETPOINT FOR THE PORY WILL RESULT IN A DECREASE IN PLANT FLEXI8ILITY. FOR EXMPLE. THE ABILITY OF r

THE REACTOR TO AUTCMATICALLY RUMBACK FOLLOWING LOSS OF OFFSITE POWER. HOWEVERc P

IN LIGHT OF PAST B&W EXPERIENCES TO RX.LCW SUCH TRANSIENTS AND IN LIGHT OF

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- OPERATING HISTORY OF THE VALVES. I BELIEVE SUCH CHANGE IS WARRANTED i

E I SUGGEST THESE RECOPMENDATI0 TIS BE DISCUSSED WITH CANNY LABELLE AM6 ERIC SUANSON J

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Att0 FRANK WALTERS OF tiUCLEAR SERVICE 8EFORE FINAL DECISI0 tis ARE MADE.

I IF YOU HAVE AtY A ITIONAL QUESTIONS. PLEASE ADVISE.

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