ML20064D601

/03L-0 on 781004:during Surveillance Testing, Setpoint for Reactor Protec Sys Reactor Coolant Low Flow Trip on Channel B Was Out of Spec.Setpoint Was Readjusted. Rev Will Req Low Flow Trip Unit Setpoint Be Reset

ML20064D601
Person / Time
Site:	Millstone
Issue date:	11/01/1978
From:	Crockett J NORTHEAST UTILITIES
To:
Shared Package
ML20064D599	List: ML20064D596 ML20064D601
References
LER-78-024-03L, LER-78-24-3L, NUDOCS 7811080146
Download: ML20064D601 (1)

Text

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EVENT oESCRIPT!oN AND PRoca8t.E Cof4SECUENCES h lDuring monthly surveillance testino, the setooint for the Ro a c tn r- Protective tuttom I 0 2

, , , reactor coolant low flow trip, on Channel B,'was found to be out of specification in g

, ,a non-conservative direction, at 91.50*.' flow. The setpoint was readjusted to its i specified value. The plant was operateo in accordance with action statement 2 of  ;

Technical Specification 4.3.1.1.1 Similar occurrences: LER 77-28 date'd 8/18/77 and ,

LER 78-18 dated 8/31/78.  ;

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li l 0 l l Instrument drift within the Gulf Atomic bistable trio unit. FI D-240-0001F_

, , , Immediate action taken was to readjust the trip unit to its specified value. The i surveillance procedure will be revised to require that the low flow trip unit setpoint ,

, be reset to the specified value regardless of the deviation from setpoint. This  ;

- revision is to be in effect by the December surveillance date. I i 4 l s g 30 7

STA S  % POWER OTHER $7ATuS 15 0 RY OISCOVERY DESCRIPTION Ii 15 I LEj@ l1 l0 l0 l@l NA . l [B_j@l Surveillance testing I A NVITY CO TENT AMOUNT OF ACTIVITY LOCATION OF RELEASE i a RELk4 SED 06RELEASEL_j NA @ lZ l@l l [ NA l 44 45 80 7 8 9 to 13 PERSOP4NEL EXPOauRES NUMGER TYPE DE$sillP TION "a I i i l_oIoInl@L2J@l"

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. NAME oF PREPARER