05000369/LER-1981-076, Forwards LER 81-076/03L-0.Detailed Event Analysis Encl

Forwards LER 81-076/03L-0.Detailed Event Analysis Encl

ML20009F691
Person / Time
Site:	McGuire
Issue date:	05/29/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F694	List: 05000369/LER-1981-076, Forwards LER 81-076/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-076-03, /03L-0:on 810502,alarm Annunciated for Noble Gas Activity monitor,EMF-33,indicating Loss of Sample Flow During Initial Fuel Loading.Caused by Bolts Insufficiently Tightened to Secure Seals During Monitor Maint
References
NUDOCS 8107310413
Download: ML20009F691 (2)

LER-1981-076, Forwards LER 81-076/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981076R00 - NRC Website

text

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OFFICIACpopy DUKE POWER COMP O E ET'.t a *-

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Mr. James P. O'Reilly, Director s

U.S. Nuclear Regulatory Commission

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Atlanta, Georgia 30303 6,

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N Docket No. 50-369

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81--76. This report concerns the operability of the noble gas activity monitor for the Condenser Evacuation System. This incident was considered to be of no significance with respect to the health and safety of the public.

Very truly yours, William O. Parker, Jr.

RWO:pw Attachment cc: 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, CA 94303 Ms. M. J. Graham Resident Inspector - NRC McGuire Nuclear Station

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b ij 8107310413 810529 DR ADOCK 05000

. e McGUIRE NUCLEAR STATION INCIDENT REPORT Report Number:

81-76 Report Dat'c:

June 1,'1981' Occurrence Date: May 2, 1981 Facility: McGuire Unit 1, Cornelius, N. C.

Identification of Occurrence:

The noble gas activity monitor (EMF-33) for the Condenser Steam Air Ejector System (ZJ) was declared inoperable.

Condition Prior to Occurrence:

Mode 6; Initial fuel loading Description of Occurrence: On May 2, 1981, the annunciator alarm for EHF-33 sound <

in the Control Room, indicating a loss of sample flow, and would not clear. The flow indicator fluctuated considerably and did not function properly. This system was declared inoperable, and it was reportabic pursuant to Technical Specification 3.3.3.9.

Apparent Cause: During the process of previous maintenance work on this EMF's pump, the pump seals were replaced.

However, the bolts securing the seals were apparently not tightened sufficiently.

Analysis of Occurrence:

The annunciator alarm for EMF-33 indicated a loss of samp1 flor and would not clear.

Health Physics was notified and was requested to invest:

gate the problem.

The flow indicator f,luctuated erratically and the EMF would function only in the " MANUAL" mode.

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EMF-33 was declared inoperable and Health Physics took and analyzed a grab sample every eight hours as stipulated by action statement #37 of Table 3.3-13.

A work request was initiated to have the. system repaired; the EMF was examined and the seal bolts inside the vacuum pump were tightened.

The system was returned to service at 1610 hours0.0186 days <br />0.447 hours <br />0.00266 weeks <br />6.12605e-4 months <br /> on May 5, 1981.

Safety Analysis

Only new, non-irradiated fuel existed in the core at the time of this incident; and Health Physics sample results confirmed that no radiation abo /:

background was present in this system. The safe operation of the plant and the health and safety of the public were, therefore, not affected.

Corrective Action

The station implemented the appropriate action statement in accordance with Tec..ical Specification 3.3.3.9, and initiated a work request

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to have the system repaired.

The EMF vacuum pump was repaired.