ML20113D147

Proposed Tech Spec Table 4.8-1, Diesel Generator Test Schedule

ML20113D147
Person / Time
Site:	Summer
Issue date:	04/09/1985
From:	SOUTH CAROLINA ELECTRIC & GAS CO.
To:
Shared Package
ML20113D144	List: ML20113D141 ML20113D147
References
NUDOCS 8504150020
Download: ML20113D147 (3)

Text

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A%b + A E'ECTRICAL L POWER SYSTEMS --

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) TABLE 4.8-1 DIESEL GENERATOR TEST SCHEDULE l

Number of Failures In Last 100 Valid Tests

• Test Frequency 11 At least once per 31 days 2 At least once per 14 days 3 At least once per 7 days

>4 At least once per 3 days

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" Criteria for determining number of failures and number of valid tests shall be in accordance with Regulatory Position C,2.e of Regulatory Guide 1.108, Revision qI .ggst 1977, where. the last 100 tests are determined on a per n__._r unit basis. For the purposes of this test schedule, only valid tests conducted after the OL issuance date shall be included in the computation of the "last 100 valid tests." Entry into this test schedule shall be made at the 31 day test frequency.

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r m 4 Attachment B No Significant Hazards Determination

1. .Will operation of the facility.in accordance with this proposed change involve a significant increase in the probability or consequences of an accident previously evaluated?

No.

The proposed' change will not involve a significaat increase in the probability or consequences of an accident previously evaluated.

The change does not affect how the diesels will operate in an emergency condition, and is only intended to help ensure that the diesels- will not be degraded by excessive testing and thus prevented from performing as required in the accident analyses.

2. Will operation of the facility in accordance with this proposed amendment create the possibility of a new or different kind of accident from any accident previously evaluated?

No.

The diesels will be tested at an acceptable frequency to assure proper operation. This proposed change in no way alters the physical plant design or diesel generator design and therefore precludes the possibility of any new or different kind of accident from occurring.

3. 'Will operation of the facility in accordance with this proposed amendment involve a significant reduction in a margin of safety?

No.

This proposed amendment is being requested to prevent possible degradation of the diesel generators. The amendment would further improve margins of safety by preventing degradation and assuring that the diesel generators remain in reliable and safe conditions.

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. ATTACHMENT C Basis for Exigent Request

- The proposed . change to Technical Specification 3/4.8.1 resulted from a recent' reevaluation of diesel generator test failures by SCE&G. A misinterpretation of Regulatory Guide 1.108 caused SCE&G to initially-define the failures as invalid; however, during the reevaluation on March 28,'1985 'these errors were discovered and increased testing of the diesel generators began according 'to the Tachnical Specification requirements. Presently SCE&G is testing a diesel generator each day..

SCE&G's position is that excessive testing of the diesel generators could potentially~ lead to the degradation of these components. Each start and run. places additional wear and stress on the diesel generators' parts.. Furthermore, the increased testing does not

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.provida significantly greater assurance that the diesel generator will

' start and provide power in-the event of an emergency situation.

~ESCE&G's prior operating history of the diesel generators provides a high degree of support for the components' ability to perform adaquately when needed. Additionally SCE&G's increased experience withLthe diesel generators provides for better maintenance and

' operating practices which can be followed to help ensure the components will perform as designed.

' This ' exigent relief is being requested because SCE&G is concerned about the'possible detrimental effects the present accelerated testing frequency may have on the diesel generators at the Virgil C. Summer Nuclear Station. SCE&G considers the expedious review warranted in light of the possibility of diesel generator degradation resulting from continued testing at.the presently required frequency.

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