ML19317G881

Advises That Diesel Generator Alarm & Control Circuitry Adequate Per NRC Review of Circuitry Evaluation Discussed in Util .Nonalarmed Conditions Should Not Occur Preventing Automatic Start of Generators

ML19317G881
Person / Time
Site:	Rancho Seco
Issue date:	05/24/1978
From:	Reid R Office of Nuclear Reactor Regulation
To:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
NUDOCS 8004020541
Download: ML19317G881 (2)

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,DISTiMBUTION:

tiay 24, 1978 9

E L PDR Docket flo. 50-312 0

ORB #4 Reading

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BGrimes/TCarter E===3 GVissing Sacramento Municipal Utility District GZwetzig y= =i ATTN: Mr. J. J. Mattimoe TWambach file lg Assistant General Manager WButler and Chief Engineer ham

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6201 S Street P. O. Box 15830 01&E(3)

Sacramento, California 95813 s nh

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Gentlemen:

JBuchanan

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ACRS(16) 7.7 By letter dated March 28, 1977, we requested that you review the alam ET and control circuitry for the diesel generators at Rancho Seco Unit 5

No.1, and provide us with infomation concerning possible nonalarmed conditions which might render the diesel generators incapable of

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automatic start. He also reque-ted that you proposer. modifications

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that would correct any nonalarmed disabling conditions that were identified as a result of your review.

By letter dated May 16, 1977, E

you submitted the results of your review. Your submittal indicated E==

that there were no nonalarecd conditions that could prevent automatic --

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start of the diesels.

Also, later discussions with your staff deter-mined that the diesel generators are provided with manual shutdown lockoutz

.l==l relays with alarms. An engineering safety feature signal will override the lockout and automatically reset the lockout relay.

fg We also understand that all shared annunciators for disability conditions are not able to be cleared until all abnormal conditions are corrected.

This is to advise you that we have reviewed your submittal and on

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the basis of our review conclude that the alam and control circuitry

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for the diesel generators are adequate and should preclude occurrence of any nonalamed conditions that could prevent automatic start of the diesel generators.

g..7 Sincerely.

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N Robert U. Reid, Chief f

Operating Reactors Branch #4

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Divisica of Operating Reactors M, d

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6201 S Street

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