ML19354C386

LER 80-037/03L-0:on 801025,during Routine Surveillance, Bistable Setpoint That Instates Channel D Local Power Density & Loss of Turbine Trips Found Above Required Setpoint.Caused by Normal Bistable Drift.Bistable Recalibr

ML19354C386
Person / Time
Site:	Millstone
Issue date:	11/24/1980
From:	Clement C NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345B802	List: ML19345B801 ML19354C386
References
LER-80-037-03L, LER-80-37-3L, NUDOCS 8012020535
Download: ML19354C386 (1)

Text

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74 75 REPCRT D ATE 80 EVENT DESCRIPTION ANo PROB ABLE CONSEouENCES h l o 121 l During routine surveillance of the reactor orotection system. tha hittible cornnin+

o 33 j l that instates Channel D local power density and loss of turbine trios *was found above i I o 1.s i I the required setpoint. The LPD and loss of turbine trips are recuired to be insta+ad _]

o isi I above 15 percent power per Table 3.3-1 (Note C) and Table 2.2-1 (Note C) of the l l0 Js j ; Technical Specifications. The plant was operated within Technical Soecification Table 1 j o l7] l 3.3-1, Action Statement 2. There have been no similar events. I I

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33 34 35 CAUSE DESCRIPTION ANo CCRRECTIVE ACTIC,iJS h tija]l During a calibration, the bistable setooint had been left at the hiah limit allo ilyJ 3,,,ji the surveillance procedure; thus, the apparent cause is nomal bistable drift. Tha I

, , , , , , bistable was recalibrated and restored to service. Technicians have been cautionad to l leave these setpoints at mid-range of allowed band. The bistable is a Gulf l f i l 31 l

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Car Clement PHONE: (203) 447-1791 (X572) {

NA?.tE oF PREPARER