ML19326C778

Submits Info Re ECCS Small Break Analysis Per NRC Request. Full Power Operation W/One Operating Makeup Pump Combined W/ Proposed Interim Fix Considered to Provide Substantial Margin to 10CFR50.56.Tech Specs Change to Be Requested

ML19326C778
Person / Time
Site:	Arkansas Nuclear
Issue date:	04/21/1978
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
1-048-15, 1-48-15, NUDOCS 8004280713
Download: ML19326C778 (2)

Text

NR0 '" r.M 495 *% U.S. NUCLEAR CEGULATORY ( WSSION OCCKET NUMIE R 12 7ei SD 3/3 NRO DISTRIBUTION roR PART 50 DOCKET MATERIAL ''"'""

lTO: Mr. R.W. Reid FROM: Ark. Power & LLight Co. DATE F0 UMENT f

Little Rock, Ark. 72203 D. H. Williams DATE El O 25.ETTE n CNoToRtzED PROP INPUT FORM NUMBER OF CDPtES RECEIVED CORio:NAL MC LAS$1FIE D WC0" t reL2W cEsCRIPTION Ltr furn addl inf0 On ECCS small ENCLCSURE l

break analysis interim solution....1P 3 1

l THis DOCUMENT CONTAlNS POOR QUAUTY PAGES E

PLANT NAME : Ark. One Unit 1 DHL 4-24-78 garrTv nur & P D em #whs FOR ACTION /INFORMATION ENVIRONMENTAL act'cNen AD: ASSIGNED AD: V. MOORE (LTR)

BRANCH CHIEF: BRANCH CHIEF:

PROJECT MANAGER: con.TFCT VANAGER:

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April 21, 1978 I

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L 1-m e-is li Director of Nuclear Reactor Regulation ATT't: Mr. R. W. Ruid, Chief f Operating Reactors Branch f4 l l1. S. Nuclear Regulatory Co:rission

[ Washington, D. C. 20535 i'

Subject:

Arkansas Nuc1 car One-Unit 1 Docket No. 50-313 ~

j, 1,1 cense No. DPR-51 -

h Raportable occurrence No. 50-313/78-9 ECCS Scall Break Analysis i Interim Solution '

(File: 0520)

R b' centie:.en: "

4j l y As a followup to Mr. Ruater's letter on the above captioned i subject earlier today, the following infor ation is provided in response j to Mr. Vissing's requests for additional information. p Based on cos:unication with BW ve believe that 100% Tull Powar (FP) ,

op.: ration with one :sakeup pump in operation co.nbined with our proposed '

, lateria fix provides substantial margin to 10CFR50.46. I I

i' *te vill submit the results of the Br4 analysis including break spectru:n, h,

identification of worst break, justification for adequacy of core uncovery

• F ta=peratures, and justification that ti=c scale for operator is within y analysis assu=ptions, as soon as they are available.

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'Je will subnit a Technical specification change request (per your request) I l

! as appropriate to imple=ent the interim fix. -

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~t f We v111 submit a proposal for a 1cng term fix, with 1sss ra11ance on a g '] high state of operator readiness, within three (3) ::enths of this date.

i\ Very truly yours.

S Daniel H. Wil11ans fQ & I f Manager, Licensing DW:J!Et tv c a g..wsy - s . 3_ _ . :crn .y hu.wiya,:,2visc.v/c.ww.w .w,wsvis,ysi.tellgw.m.m.yg; nit:;n;;s,9;ggnw.yyat,:.yyyy,;,,y;g.y;,,q:y,,y.y.yg y y.y,z,;.;gz., .,g,,,z,,,,,.,.,,

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