ML20028F412

LER 83-002/01X-0:on 830116,while Clearing off-normal Alarm for Flow Comparators,Average Power Range Monitor Flux Scram Trip Settings Found in Nonconservative Direction.Caused by Drifting Proportional Amplifiers.Settings Checked Daily

ML20028F412
Person / Time
Site:	Pilgrim
Issue date:	01/17/1983
From:	Whitney G BOSTON EDISON CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-83-002-01X, LER-83-2-1X, NUDOCS 8302010335
Download: ML20028F412 (1)

Text

BOSTON EDISON' COMPANY Certifica EF Tf M f PROMPT REFORTABLE OCCURRENCE TELECOPY MESSACE T0: (215) 337-5324 DATE/ TIME: 1/17/83 /

Telephone Number e TO: Ronald C. Haynes FROM: Pilgrim Nuclear Power Station

, Regional Administrator, Region 1 RFD#1, Rocky Hill Road U. S. Nuclear Regulatory Commission Plymouth, MA 02360 63.1 Park Avenue King of Prussia, PA 19406 Docket Number 50-293-License DPR-35

. Assigned LER Number 83-002/01X-0 Reported per T.S. Section 6.9.B.1.e Event

Description:

On 1/16/83, while clearing an off-normal alarm for the flow comparators, it was determined that the APRM flux scram trip settings had been found in the non-conservative direction i.e. above .65 W+ 55% (T.S. 2.1.A.1.a).

Cause and Corrective Action: Both proportional amplifiers were found to have drifted beyond allowable limits ("A" channel = 104%, "B" channel = 91%). Investi-gation of this event is in progress however, cause has not yet been determined. A daily check of the settings is being conducted to ensure timely identification should this reoccur.

Facility Status: 1 -75  % Thermal MW c) Routine Startup g) Shutdown d) Routine Shutdown h) Refueling e) Steady State 1) Other f) Load Changing X j) Not Applicable A written followup report will be sent within two weeks.

NRC Person Notified H. Eichenholz Prepared by G. G. Whitney cc: Document Control Desk U.S. Nuclear Regulatory Commission _

Washington, D.C. 20555 Standard BECo. LER Distribution B302010335 830117 PDR ADOCK 05000293 -

s PDR

.