ML18024A880

LER 79-016/03L-0 on 790605:pressure Switches PS-1-81A & B & Setpoints PS-1-91A & B Exceeded Tech Spec Limits During Test.Caused by Instrument Drift.Switches Recalibr & Tested Satisfactorily

ML18024A880
Person / Time
Site:	Browns Ferry
Issue date:	07/03/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024A879	List: ML18024A878 ML18024A880
References
LER-79-016-03L, LER-79-16-3L, NUDOCS 7907090356
Download: ML18024A880 (1)

Text

....I NRC FORM QB U~UCLEAR REGULATORY CohlhIISSION

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~O LL +B p 5 p p 0 2 6 0 7 0 6 0 5 7 9 s 0 7 p q o 7 8 60 61 DOCKET aaUVBER 68 69 EVE9aT DATE 74 5 REPORT DA, E 80 EVENT DESCRIPTIOM AND PROBABLE CONSEQU NCES QIO During normal operation while performing SI 4.1.A-14, turbine first stage pressure

~O3 permissive, pressure s1:i'tches PS-1-81A & B and PS-1-91A & B setpoints e7'ceeded T. S.

Table 3.1.A liznits by 3 to 8 psig. The probletI would have inhibited reactor sera=,on a turbine trip, until reactor power vas greater than 31 percent. TS li~it is 30 percen

~OS Previous occurrence 50-259/7916.There vas no hazard to the publ c health or safet"-.

~O7 There are,no redundant channels.

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33 34 35 36 37 40 41 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 The model B2T-A12SS switches had drifted. The switches were recalibrated and function ally tested satisfactorily. The cause of the instrument drift is still under inves-tigation.

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