05000251/LER-1985-001, :on 850102,containment Isolation Valve SV-2819 Failed to Close at 100% Power Upon Receiving Containment Ventilation Isolation Signal.Caused by Dirt Buildup on Contacts in Lockout Relay.Contacts Cycled

:on 850102,containment Isolation Valve SV-2819 Failed to Close at 100% Power Upon Receiving Containment Ventilation Isolation Signal.Caused by Dirt Buildup on Contacts in Lockout Relay.Contacts Cycled

ML20102A005
Person / Time
Site:	Turkey Point
Issue date:	02/01/1985
From:	Teuteberg R, Williams J FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
L-85-58, LER-85-001, LER-85-1, NUDOCS 8502080079
Download: ML20102A005 (2)

LER-1985-001, on 850102,containment Isolation Valve SV-2819 Failed to Close at 100% Power Upon Receiving Containment Ventilation Isolation Signal.Caused by Dirt Buildup on Contacts in Lockout Relay.Contacts Cycled

Event date:
Report date:
2511985001R00 - NRC Website

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NRC Pere 300 U S. NUCLEAN KELULATORY COMmelSSION

• • M LPPROVED oms NO 3150.G 04 LICENSEE EVENT REPORT (LER)

PACILITV NAME m DOCKET NvMSER 12)

PAGE G Turkey Point Unit 4 o is I o l0 lo l2l5 l 1 1 lorl 0l1 TITLE (A6 Containment Ventilation Isolation Valve Failure EVENT DATE (El LER NutASER IS)

REPORT DATE (7)

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50.73(sH2Hal LICENSEE CONTACT FOR TMIS LER (12)

NAME TELEPMONE NUMBER ARE A CQQE 10 291 R. L. Teuteberg, Regulation and Compliance Engineer 3l Oi 5 2,4;5l -i 1

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On January 2,1985 at 1:06 a.m., while Unit 4 was at 100% power, containment isolation valve SV-2819 failed to close upon receiving a containment ventilation isolation signal during testing of containment process radiation monitors R-ll and R-12 as per Operating Procedure 0204.2. The valve was closed immediately by manually tripping lockout relay QR50 in the control room. SV-2819 is a containment isolation valve for the instrument air bleed line and is located outside containment.

Containment isolation for this line is also provided by SV-2826, Imated inside containment, which did close on the containment ventilation isolation signal. There was no detectable release of radioactive gases from containment as a result of this incident. The health and safety of the public were not affected. Similar occurrences: LERs 251-84-020 and 250-84-031.

Cause of Event

A set of contacts in lockout relay QR50 for containment ventilation isolation did not consistently make contact due to oxidation and dirt buildup on the surfaces from extended use. 'lhis prevented the isolation signal from reaching SV-2819.

Corrective Actions

The contacts of the lockout relay in QR50 were replaced and SV-2819 was cycled successfully. Ar Unusual Event was declared in accordance with the Turkey Point Emergency Plan. The requiree State officials were notified at 1:15 a.m., and the NRC was notified via the ENS at 1:20 a.m.

pursuant to 10CFR50.72(a)(3). The Unusual Event ended immediately when the valve was manually closed.

8502080079 850201 PDR ADOCK 05000251 S

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i FLORIDA POWEF1 & LIGHT COMPANY February 1, 1985 L-85-58 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.

20555 Gentlemen:

Re:

Reportable Event 85-01 Turkey Point Unit 4 Date of Event: January 2, 1985 Containment Ventilation Isolation Valve Failure The attached Licensee Event Report is being submitted pursuant to the requirenents of 10 CFR to provide notification of the subject event.

Very truly yours, J. W. Williams, Jr.

Group Vice President Nuclear Eneagy JWW/SAV/js Attactanent cc:

J. P. O'Reilly, Region II, USNRC Harold F. Reis Esquire File 933.1 TP PNS-LI-85-050-1 gg2%

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