ML20134C163

Proposed Tech Specs,Revising TS 3.3.4.1, End of Cycle Recirculation Pump Trip Instrumentation, to Delete SR 3.3.4.1.6 Which Requires RPT Breaker Interruption Time to Be Determined at Least Once Per 60 Months

ML20134C163
Person / Time
Site:	Clinton
Issue date:	09/20/1996
From:	ILLINOIS POWER CO.
To:
Shared Package
ML20134C159	List: ML20134C158 ML20134C163
References
NUDOCS 9609250294
Download: ML20134C163 (3)

Text

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' " Att:chment I to U-602640 LS-94-004 Page1of3 Attached Marked-Up Pages of the Technical Specification Bases f

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. Attachment 1

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• LS-94-004

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Page 2 of 3 BASES SURVEILLANCE SR 3.3.4.1.4 (continued)

REQUIREMENTS inoperable. Alternatively, the bypass channel can be placed in the conseMative condition (nonbypass). If placed in the

~ nonbypass condition, this SR is met and the chann11 considered OPERABLE.

The Frequency of 18 months has shown that channel bypass failures between successive tests are rare.  ;

SR 3.3.4.1.5 This SR ensures that the individual channel response times are less'than or equal to the maximum values assumed in the accident analysis. The E0C-RPT SYSTEM RESPONSE TIME acceptance criteria are included in applicable plant l pro'cedures. < - fygg7-No t cn urv an state iat nter 10 '

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E0C-RPT SYSTEM RESPONSE TIME pnducted on an I 18 month STAGGERED TEST BASIS u te aquires STAGGERED TEST BASIS Frequency to be de a per Function basis. This is accomplished by testing all channels of one Function every 18 months on an alternating basis such that both Functions are tested every 36 months. This Frequency is based on the logic interrelationships of the various channels required to produce sn E0C-RPT signal. Response times cannot be determined at power because operation of final actuated devices *is required. Therefore, this >

Frequency is consistent with the typical industry refueling j cycle and is based upon plant operating experience, which '

shows that random failures of instrumentation components that cause serious response time degradation, but not  ;

channel failure, are infrequent occurrences.

(continued)

' 4 8 3.3-74 Revision No. 1-1 CLINTON

1 Attachment 1 l

, to U-602640

. . LS-94-004 Page 3 of 3 INSERT for TS Bases page B 3.3-74  ;

@ Section 3.3.4.1.5 i l

The EOC-RPT SYSTEM RESPONSE TIME includes an assumed RPT breaker interruption time of 95 milliseconds. The assumed RPT breaker interruption time is gg validated by the performance of periodic mechanical timing checks, contact gap measurements and high potential tests on each breaker in accordance with plant ll procedures at least once per 36 months. The acceptance criterion for the RPT breaker mechanical timing check shall be s 34 milliseconds.

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