05000369/LER-1981-012, Forwards LER 81-012/03T-0

Forwards LER 81-012/03T-0

ML20008E877
Person / Time
Site:	McGuire
Issue date:	03/05/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20008E878	List: 05000369/LER-1981-012, Forwards LER 81-012/03T-0 05000369/LER-1981-012-03, /03T-0:on 801211,isolation Valve NV-250 Found Not Verified Closed Under Administrative Control Per Tech Spec. Caused by Lack of Signoff Step in Daily Surveillance Items. Procedure Change Incorporated
References
NUDOCS 8103100428
Download: ML20008E877 (2)

LER-1981-012, Forwards LER 81-012/03T-0

Event date:
Report date:
3691981012R00 - NRC Website

text

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0 DUKE POWER COMPANY Powen 13ctLuiso ace SocTu Cucacu STurer. CiuMLOTTE. N. C. ana42 w w 4 m o. ma a m c a.. n.

March 5, 1981 n e p.cs oto, c. c.-% c u t. a s c.

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v-Mr. James P. O'Reilly, Director p

h U. S. Nuclear Regulatory Commission

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Region II M

e 101 Marietta Street, Suite 3100 2./

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Atlanta, Georgia 30303 44 11 Re: McGuire Nuclear Station Unit 1 N

Docket No. 50-369

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-12. This report concerns surveillance of isolation valve NV-250.

This incident was considered to'be of no significance with respect to the health and safety of the public.

.This report was inadvertently categorized as a 30-day report whereas it should have been a 14-day report.. Consequently, this report is being submitted eight days late.

.Very.truly yours, w f!

gis Zs-l William O. Parker, Jr.

• /g RWO:ses Attachnent ec: Director Mr. Bill Lavallee Office of Management and Program Analysis Nuclear Safety Analysis Center U. S. Nuclear Regulatory Commission P. O. Box 10412 Washington, D. ' C.

20555 Palo Alto, California-94303 I

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MCGUIRE NUCIL\\R STATION INCIDENT REPORT Report Number: R0-369/81-12 Report Date: February 20, 1931 Occurrence Date: February 5, 19Si Facility: McGuire L* nit 1, Cornelius, North Carolina Identification of Occurrence:

Isolation Valve NV-250 was not Verified Closed Administratively Every 72 Haurs Following Completion of Initial Fuel Loading Conditions Prior to Occurrence:

Initial Fuel Loading, Mode 6 Description of Occurrence:

On February 11, 1981, isolation valve NV-250 was found not to have been verified closed under administrative control as required by Technical Specification 4.9.1.3.

Apparent Cause of Occurrence:

Daily Surveillance Items did not contain a sign-off step to verify that NV-250 was closed.

Analysis of Occurrence:

Initial Fuel Loading test procedure required that NY-250 be verified closed administratively per Technical Specification 4.9.1.3.

NV-250 was last verified locked closed per the above TP at 1825 hours0.0211 days <br />0.507 hours <br />0.00302 weeks <br />6.944125e-4 months <br /> on February 2, 19S1. The status of NV-250 was not checked again until 1955 hours0.0226 days <br />0.543 hours <br />0.00323 weeks <br />7.438775e-4 months <br /> on February 11, 1981, and was found to be locked closed with the White Equipment Danger Tag attached. Operations misinterpreted Technical Specification 4.9.1.3 to mean that NV-250 should be verified closed only when initial fuel loading was in progress. This was not the case, and thus was reportable.

Since NV-250 was locked closed when it was checked on February 11, 1981 it can be assumed that it had been closed since FrTruary 2, 1981. However, even if NV-250 had been open, there were other valves downstream of NV-250 which were locked closed or normally closed which would have prevented a boron dilutien of the Reactor Coolant System. Thus, the incident did not affect safe plant operation and_the health and safety of the public were not affected.

Corrective Action

A procedure change was-incorporated into Daily Surveillance Items to verify that NV-250 is verified locked closed under administrative control.