05000325/LER-1980-075-03, /03L-0:on 800912,during Performance of Main Steamline Isolation Valve Closure Functional Test,Reactor Protection Sys Logic relay,C71-K3E,did Not de-energize. Caused by Stuck Contacts in Valve Position Limit Switch

/03L-0:on 800912,during Performance of Main Steamline Isolation Valve Closure Functional Test,Reactor Protection Sys Logic relay,C71-K3E,did Not de-energize. Caused by Stuck Contacts in Valve Position Limit Switch

ML19347B671
Person / Time
Site:	Brunswick
Issue date:	10/07/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347B666	List: 05000325/LER-1980-075, Forwards LER 80-075/03L-0 05000325/LER-1980-075-03, /03L-0:on 800912,during Performance of Main Steamline Isolation Valve Closure Functional Test,Reactor Protection Sys Logic relay,C71-K3E,did Not de-energize. Caused by Stuck Contacts in Valve Position Limit Switch
References
LER-80-075-03L, LER-80-75-3L, NUDOCS 8010150531
Download: ML19347B671 (2)

LER-1980-075, /03L-0:on 800912,during Performance of Main Steamline Isolation Valve Closure Functional Test,Reactor Protection Sys Logic relay,C71-K3E,did Not de-energize. Caused by Stuck Contacts in Valve Position Limit Switch

Event date:
Report date:
3251980075R03 - NRC Website

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LICENSEE EVENT REPORT

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6 00 GI DOCKET NUM3ER CJ 63 EVENT DATE 74

?S HEPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CO'JSEQUENCES h lol2l l During the performance of Main Steamline Isolation Valve Closure Functional Test, l

[ol3l l PT 1.3.1P, the RPS logic ~ relay, C71-K3E, did not de-energize as required when l

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!!SIV-F0283 was closed. The "A" RPS Channel was placed in the tripped position as l

10lsl l required by Technical Specifications.

This event did not affect the health Or

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}l3l0ll Mechanicall*/ stuck contacts in the valve position limit switch prevented the logic l

mI relay from de-energizing.

The-contacts were mechanically exercised to relieve the I

igl stiffness and the PT was performed satisfactorily.

All other valve limit switches l

!li13l l were checked =and found satisfactory.

These switches are checked monthly and do not l i

1i141-l have a history of failure.

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A. C. Tollison, Jr.

LER ATTACIB!ENT - RO # 1-80-75 Facility:

BSEP Unit No. 1 Event Date:

09-12-80 A recent plant modification on the HSIV's involved the installation of new valve position limit switches.

The mechanical stiffness c.f the limit switch contacts is believed to have been caused by the relative newness of the switch and its short time in use.

The limit switch will be inspected during the next outage of sufficient length to assure that no problems are developing.

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