05000261/LER-1981-014-03, /03L-0:on 810523,discovered That Hagan Summator PM-446B Had Shifted Nonconservatively Approx 3%.Caused by Failure of Filter Capacitor Due to Normal Wear.Faulty Capacitor Replaced

/03L-0:on 810523,discovered That Hagan Summator PM-446B Had Shifted Nonconservatively Approx 3%.Caused by Failure of Filter Capacitor Due to Normal Wear.Faulty Capacitor Replaced

ML20009G018
Person / Time
Site:	Robinson
Issue date:	06/22/1981
From:	Graham J CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G014	List: 05000261/LER-1981-014, Forwards LER 81-014/03L-0 05000261/LER-1981-014-03, /03L-0:on 810523,discovered That Hagan Summator PM-446B Had Shifted Nonconservatively Approx 3%.Caused by Failure of Filter Capacitor Due to Normal Wear.Faulty Capacitor Replaced
References
LER-81-014-03L, LER-81-14-3L, NUDOCS 8108030247
Download: ML20009G018 (2)

LER-1981-014, /03L-0:on 810523,discovered That Hagan Summator PM-446B Had Shifted Nonconservatively Approx 3%.Caused by Failure of Filter Capacitor Due to Normal Wear.Faulty Capacitor Replaced

Event date:
Report date:
2611981014R03 - NRC Website

text

N U.S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT G% TROL BLOCX: l l

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60 61 DOCKET NUMiiER 68 69 EVENT DATE 74 75 REPOHT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o 12 l lon May 23, 1981, at approximately 0130 hours0.0015 days <br />0.0361 hours <br />2.149471e-4 weeks <br />4.9465e-5 months <br /> with the pInnt in cold shutdown, a l

l o 131 l routine instrument calibration identified that the Hagan Summator, PM-446B, which l o l4 l ldctermines the high steam line flow setpoint for reactor protection safeguards, had I

lo isl l shifted nonconservatively approximately 3%.

This shift would have delayed but not l

l O l6 l l prevented the fulfillment of the protection functions of this channel.

In addition.

I l 0 l 7 l lthe redundant channel was operational so there was no threat to the health and safetv I of the public. This is contrary to Technical Specification 3.5.1 and is reportable t O ls l l pursuant to 6.9.2.b.1.

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31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l o l lThe cause of this event was the failure of a filter capacitor.

This failure is attri-l 4 1 li l lbuted to normal wear resulting in the end-of-life of the ccmponent. The faultv capa-I g g lcitar was replaced and the module recalibrated on May 23, 1981.

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Supplemental Information i

for Licensee Event Report 81-014 i

1 1.

Cause Description and Analysis on May 23, 1981, at approximately 0130 hours0.0015 days <br />0.0361 hours <br />2.149471e-4 weeks <br />4.9465e-5 months <br /> with the plant at cold shutdown, a routine iastrument calibration identified that the llagan Summator (PM-446B) in the first stage turbine pressure i

channels which develops.the high steam line flow setpoint for a

reactor protection safeguards had shifted nonconservatively 4

approximately 3%.

This shift would have delayed but not prevented the fulfillment of the protection functions of this channel. The redundant channel was operational co there was no threat to the j

health and safety of the public.

This event, which is contrary to Technical Specification 3.5.1, is reportable under Technical j

Specification 6.9.2.b.1.

2.

Corrective Action

The cause of this event was found to be the failure of a filter capacitor. This failure is attributed to normal wear resulting in the end-of-life of the component. The faulty capacitor was replaced and the module recalibrated on May 23, 1981.

3.

_ Corrective Action to Prevent Further Occurrence Since the failure is attributed to normal wear, no further action is required. The module is teste'd and recalibrated yearly.

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