ML20244A971

PNO-III-80-44:on 800306,licensee Confirmed That Computer Code Input Error Identified by Ae During Analysis of Safety Relief Valve & LOCA Dynamic Loadings.Effects Not Known. Reanalysis Required to Assess Impact

ML20244A971
Person / Time
Site:	Clinton
Issue date:	03/07/1980
From:	Knop R, Wescott H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-80-044, PNO-III-80-44, NUDOCS 8004240261
Download: ML20244A971 (1)

Text

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PR$LIMIEARYNOTIFICATION r Date: March 7,1980 4 PREllHINARY NOT1rICATION OF EVEh7 OR UN11SUAL 80-44 OCCUR

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This safety preliminary notification or public interest constitutes EARLY notice of events of POSSIBU significance.

The information presented is as I

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tha t i s kn own by LE s ta f f a s o f this da te. initially received all with Facility: 1 Illinois Power Company ~

Clinton Station Unit 1 Doeket No: 50-461 i StGJECT:

REPORTED COMPUTER CODE INPUT ERROR f

~~' ' * - The licensee confiraed on March 6,1980 that a corputer code inpI during an analysis of the safety relief valveeers (SRV) identi associated withand theInu af e*Lant midenc and structure (toco cynamic systeca desien loadings Clinton ect proj The error is related to a non conservative foundation soils p roperty value which was used in the model a safety relief valve operation or a LOCA.

to calculate the dynamic loads resulti ng from The correctoverall effects of the error have not been determined .

design, construction and fuel load date. foundation prcoerties e will be

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This preliminary notification is being issued because of anticipated interest.  ; media The utility has issued'a press release.

. The State of Illinois is being inforced.

a This preliminary notification is for information only.

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Contact:

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v. ')l H. Wescott, 384-2586 Distribution: Trans:nitted H St R. C. Knop, 384-2578 $- s Chaircian Ahearne P N Tl Co:=issioner Hendrie S. 9. Chilk, SECI Concissioner Gilinsky Co:nissioner Bradford Co::z:issioner Kennedy ACRS C. C. berer, CA

~ _ .. (For Distribution)

Trans$itted: MKBB P. Bldg V. J. Dircks, EDO E. R. Denton, KRR IE:XOOS //6tf/j)y li C. Michelson, fr4D R. C. DeYoung , h'RR J. J. Touchard, PA R. J. Mattson, hTa Landow N. H. Haller, HPA D. Vassallo, NRR (6 oin/-

7"- R. G. Ryan, OSP J. J . Cu:tming s , 01 A D. Eisenhut, h7R H. K. Shapar, ELD SS Bldg (tiAIL)

J. G. Davis , R'.SS R. Minogue, SD S. Levine, RES IE:XOOS ff0Y2 YD 2

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Y' PRELIMINARY NOTIFICATION

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