ML20086D362

Ro:On 760806,util Notified by Westinghouse of Recent Developments Re Westinghouse Safety Analyses.Limiting Values for Fq & Pnh Reduced to 2.27 & 1.49,pending Further Investigation

ML20086D362
Person / Time
Site:	Robinson
Issue date:	08/06/1976
From:	Mcgirt J CAROLINA POWER & LIGHT CO.
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20086D349	List: 05000261/LER-1976-014, Updated LER 76-014:on 760805,util Notified by NRC That Peak Clad Temp Increase Presented by Westinghouse Should Be 50 F Higher.Caused by Using Different Versions of ECCS Model. New Limit in Effect 750825.W/760917 Ltr ML20086D362
References
NUDOCS 8312010194
Download: ML20086D362 (2)

Text

M h h Caro &ww Power & LicM Compeny emwavw

11. B. ROBINSON STEAM ELECTRIC PLG'T .

p Post Office Box 790 Bortsville, South Carolina gpy August 6, 1976 -

L -

Robinson File- No. 2-0-4-a-1 Mr. Nor: man C. Merneley, Director Director of Regulatory Operations Nuclear Regulatory Cocmaission Region II, Suite 818 230 Peachtree Street. N.W. . , _ _ _

Atlanta, Georgia 30303 Mr. John G. Davia . Acting Director . , , , , , . . _ ,

Director'of Regulatory _

Nuclear Hegulatory Cocumission' .=

Washington, D. C. 205G5 -  :

Dear Sirs:

~

In accordance with Section -6'.6'.1.a ' of' the Technical' Specifications , ,

the follcnring Reportable Occurrence :ih submitted:

On August 6, 1976, Carolina Power & Light Company was notified by

' ' ' Westinghouse E3 0ctric Corporation of ~recent developments that bear- '

on the Westinghouse safety analyses. The developments which af fect H. B. Robins.on Unit No. 2 are summarized belou:

1. Past ECCS analyses treated the fluid te:sperature in the upper head .j region.as equal to vessel inlet temperature .(' Cold) . Recent tests ^

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~ 'and cethoda discount this,"and ' Indicate the temperature to be ' nearer- q ,

to : that;' of '. T2for. . The consequences of this is an 1apact on peak

, .. , clad.' temperature on the LOCA analysis which' resultc in' a necessary. ,

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, reduction in Fq .frcm 2.30 to 2.27 for operation' at 22CO 3T{.,-

A' separate ' development involved "a"recent ' rest vhich Sndicated that-i

' L the rod how DN3 penalty is higher than previously used as a licens tng J:

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_ basis. M This' ndditiona17 penalty.' resultn ' in an esti:aated 93 reduction J l

'""'in DNBR'. Incorporating this penalty reqv. iresa 4% reduction in [ ' ' i gy As.an interium action, the limiting vnlues for.Y ar,d Ej, as described in Section 3.10.2 of the Technical' Specification 3 -have been reaucea to ~

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^2.27 and '1 49 respectively, pending ~ further investigation.

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- August ' 6, .1976 -. .

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- Latter.to,_Mr...Moseley-and..Mrs Davis Coot'd. .

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Thla' finding' constitutoo ~ a reporthble' occurrence as defined 'in Technical' specificatios 6.9.2.a.8"and was reported 'to Mr. Dick ~ Parker; of ~NRC7' '

Atlanta and Mr. Ilarold R. Banks of CP&L, Raleigh, on August 6,1976.

Yours very truly,

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- - Jack B. McGirt, . M.mnagere

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. B'.... Robinson. SEG Plant

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Carohne Power 3r L,5gM Company ........_..._..__.....,.,,.,. . .

y: . .g 1 H. . B. ROBINSON STEAM ELECTRIC PLANT 'iF.d d Post Office Box 790 l : . f .5

Hartsville.. South Carolina , .i ' g.M

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y August . 18, 1976' .'2l. 7,

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Robinson File No. 2-0-4-a--1'  ; M_. 1.N

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3-Mr. Norman C. Moseley, Director ' 7 ['

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Directorate of Regulatory Operations ~~

U'.' S. . Nuclear Regulatory Coasmission - 7?T ? Y['

Reg 16n II, . Sulte 818' d E ' ;.;'

230 Peachtree Street, N.W. At }

Atlanta. Georgia 30303-

' .M.. .e . )'Me Mr. John C. Daylir. Acting Director- [. '

Director of Regulatory L M,?,.S U'. S.. Nuclear Regulatory Cocamission %2 y;

-Washington, D. C. 20545 --

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Dear Sirs:

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In. accortlance with nection 6.9.2.a.5 of the Technical

• Specifications m'. p'M ;3.s i .1 the. following Reportable Occurrence is reported:- ,

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On August 17, 1976 while performing PT 22 on the Anvihry.Feedwater  % y System, v2-16A would not open electrically from the RTGB. The redundant. m .t..,

equipment operated satisfactorily proving the ability to feed the stca:s "{$:p.h0.1 j- -. generator in emergency conditions. @M q '

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l This van reported' to Mr. Dick Parker of NRC Atlanta and to Nuclear l t Ceneration Section. Raleigh'on August 18,.1976. g/ ,; i W.

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Yours very truly,. . : F .f -

o. , .L. ..-R

.y j .. if y : .

e ack B'..McGirt, Manager.

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H. B. - Robinson SEG Plant --

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