ML20024B571

Gives Tentative Approval to Fix Steam Generator Overfill Problem During Auxiliary Feedwater Flow Due to Seriousness of Problem

ML20024B571
Person / Time
Site:	Crane
Issue date:	03/14/1977
From:	Rosalyn Jones BABCOCK & WILCOX CO.
To:	Engel S BABCOCK & WILCOX CO.
References
TASK-*, TASK-GB GPU-0612, GPU-612, NUDOCS 8307090247
Download: ML20024B571 (5)

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S.J. Engel, Plant int: ration i

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j Auxiliary Teedwater Steam Generator Overft11 Problem March 14,1977 j

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Reference:

Memo. S.J. Engel to Distribution. Auxiliary Feedwater Stea:s Generator overfill-Heating Meetings 1/17/77. File T3.17.2.,

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s In the referenced memo, a preposed "fix" for the steam generator everfill u

3 problem during auxiliary feedsater flow under accident cenditiens was discussed.

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-in the =eeting. I voiced an ECCS c:ncern on the preposed fix which was not mentioned

-P in the meeting minutes. Basically, the concern is whether the centro 11ed level, 8

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6. feet with the fix, on the sec:ndary side of the steam generator is sufficient t

to control the consequences of a small break, less than 0.5 ft', in the RCS.

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l The present flRC accepted small leak analysis for the 205 FA plants is givefrin, p

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BAW-10074A, Rev.1 and uses a 40 ft level in the steam eener.ator for auxiliary feedwater centrol. For small breaks, continued c;eratthi'of the auxiliary ef feedwater system help; depressuri:e the primary. system. Therefore, no analysis G.

presently exists for the 205 FA plants which su:perts the cenclusion that a j

6-foot level centrol is acceptable f:r mitigating small breaks. H: wever, there ~

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• is presently scme c:ncern as to whether the steam generater : del in the L.

I CRAFT code,which calculates the blowd:wn during the accident, is correct.. A g

's study is presently planned by ECCS to try '3' simulate the steam generator codel

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prcperly for use in s=all break analysis. At the completion of, that program,

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it will be determined whether a 6-foot level is acceptable.

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~1 Because of the seriousness of the overfill problem. ECCS gives tentative apareval l

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to the fix. If the 6-fcot level is found not to he sufficient to control small f

1)reaks, it may be necessary to mcdify the steam generater instr==entation such

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l that an acceptable secondary side c:ntrol height is obtained. Einal determinatica of the acceptable height c:ntrol will be cbtained near the end of cats su=er.

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as outlined in the plan and specided in the detailed Procedores.

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maintenance of his safeguards contingency plan. To this end, the licensee shan

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plan by individuals independest of both security program management an'd I

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the mostruction or n=liAration.

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(b) If the proposed construction or modincation of the facility is noe l'

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