ML19276G048

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Summary of 790330 Meeting W/Ge Re Target Rock Safety Relief Valves & Review of Progress Toward Reducing Number of BWR Blowdowns
ML19276G048
Person / Time
Issue date: 04/12/1979
From: Nowicki S
Office of Nuclear Reactor Regulation
To: Ziemann D
Office of Nuclear Reactor Regulation
References
NUDOCS 7905150154
Download: ML19276G048 (16)
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MEETING SUMPARY Acril 12,1979 GE's review of the field data showed a decreasing trend in the number of inadvertant blowdowns. The attached viewgrachs :llustra:e nis trend. GE agreed to sucply time /temcerature data for the air dia.:hram as requested by the staff 0 /'- x / / f;r t-4 a Stanley J. twick i, 3roject "anager o n 9 r a "w a, n o a c + r s ' = r,, c ' s 69 c r ---s s-Division of 0:erating Reactors AttaCbtents: As stated

, -- s e, i a i i ri on.'4 csl i I L S~i J.c A~i.=.n::: ~. s.. r_ac Ti. Shirley R. Brugge C. Jonnson 'I O F. W. Anderson - C. Cherny F. Clemenson c. i - a w.2 4 r. 2 - a '/. ?ierses ,lC W ' C < ' 3. e ?-- ~) 2,- ] i. n..,

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ATTACHMEllT 2 MEETING AGENDA

Subject:

Safety / Relief Valve Blowdown Problen I. Introduction - R.O. Brugge II. Brief review of problen and causes - C.3. Jchrson III. Problen Fixes A. Strategies using existing (3-stage) Design 1. Increase sinner nargin 2. Plant operations 3. Valve maintenance '. What has been done to execute these strategies 3. New (2-stage) Design is a :1x 1. ony 1: 2. Progran status 3. Where new design is in service. IV, Progress nade to reduce blewdcwns A. Review of field data 3. Future trends V. Sunn3 ior and disCussiOr

PRIMARY CAUSES OF B L O W D O W il s

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9 CAUSES OF B L O W D O W il S PRIOR TO PARCH 1977 FARCH 1977 TO PARCH 1979 SET POIllT 27 9 AIR OPEPATOR 4 0 STEA". SOLEDID VADE 3 1 SECGD STAGE 1 0 IUT SPRIili FELAXATI0ii 1 0 55 10

FIX STRATEGIES U S I i1 G 3-STAGE D E S I G il 1. Ii; CREASE SlitER T%R3Ii1 PAISE SET PoliffS

2. PLolii 0FEPATIOi;S PEUE EAECS - FEUE PEESSUFE -

MItilMIZE ACTUATIOi!S

3. VADE i%IflEIA;E STRITEEtiT LEoYAGE ACEPTn;E CRITERIA

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SCHEDULE FOR LONG TERM I M P R O V E ti E N T PRODUCTION TESTING a o< START 1 l 1 1977 o< FIIMLFBI/SEs o <- FI.'al TEST 4 l .s c m o< rIRSI eE,Li e:.,:, i i j ~7R lo i i I i i i i v' I 2C0 U N I T S 7 9 e i i l i t I _l C/.'2 i i I h i 7 h I -.g,ei =-*e. r m, p C ."~ i '. ~_ C _.,1.~, ! i n

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TRACK RECORD OF IMPROVEMENT DATE ELO.ECWI PATE 1974 40,CCO HRS //A0sE 1976 80,00J HRS //ALVE 1978 E0,C0] HRS //AD/E

BLOWDOWN EVENTS YEAR

  1. OF ELB OJhis VALVES IN OFEDATION 1975 7

12] 1976 11 142 1977 8 152 1978 5 161 1979 TO ECH 1 151}}

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