05000369/LER-1981-068, Forwards LER 81-068/03L-0.Detailed Event Analysis Encl

Forwards LER 81-068/03L-0.Detailed Event Analysis Encl

ML20009F609
Person / Time
Site:	McGuire
Issue date:	05/22/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F610	List: 05000369/LER-1981-068, Forwards LER 81-068/03L-0.Detailed Event Analysis Encl
References
NUDOCS 8107310350
Download: ML20009F609 (2)

LER-1981-068, Forwards LER 81-068/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981068R00 - NRC Website

text

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,p yr v Mr. James P. O'Reilly, Director gL h' f-} #@

N U.S. Nuclear Regulatory Commission 07 Region II JUL 3 01981

• 101 Marietta Street, Suite 3100 g.,,,, _,

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Atlanta, Georgia 30303 wium 6

Re: McGuire Nuclear Station Unit 1 Y

8 Docket No. 50-369 N

Dear Mr. O'Reilly:

Please find a ttacied Reportable Occurrence Report R0-369/81-68. This report concerns the 'Jnit Vent noble gas activity monitor, EMF-36, being declared in-aperable.

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

y truly yours,

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~

William O. Parker, Jr.

RWO:pw Attachment ec:

Director Mr. Bill Lavallee Office of Management & 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

[ S'll 810731c 3 810522 PDR ADOC,. 05000369 S

PDR

McGUIRE NUCLEAR STATION INCIDENT REPORT f

Report Number:

81-68 Report Date: May 25, 1981 Occurrence Date: April 25, 1981 Facility: McGuire Unit 1, Cornelius, N. C.

Identification of Occurrence:

The Unit Vent noble gas activity monitor, EMF-36, was declared inoperable due to a loss of sample flow.

Conditions Prior to Occurrence:

Mode 3, Hot Standby Description of Occurrence: Control Room personnel received a loss of flow annunciator alarm for EMF's 35/36/37. The EMF fan would not operate; thus, no sample flow could be obtained.

The system was, therefore, declared inoperable.

This was reportable pursuant to McGuire Technical Specification 3.3.3.9 and re-quired going into Action Statement #37.

Apparent Cause: Broken V-belt on sample pump.

Analysis of Occurrence:

Control Room personnel received an annunciator alarm indicating a loss of sample flow on EMF 35/36/37 at 2240 hours0.0259 days <br />0.622 hours <br />0.0037 weeks <br />8.5232e-4 months <br />, on April 25.

The sample blower tripped off and would not start locally or remotely.

Crab samples were taken every eight hours as stipulated by the appropriate Technical Specification Action Statement.

A work request to have the system repaired was initiated.

On May 3, 1981, the V-belt on the sample blower was broken.

This belt was replacel and the system was declared operable at 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> of that day.

Immediate Corrective Action

Health Physics was notified to sample the Unit Vent at specified intervals and a work request was initiated to have the EMF repaired.

Safety Analysis

The temporary failure of this equipment did not affect the health and safety of the public.

The Health Physics group sampled and analyzed the effluent gases at this EMF every eight hours, as stipulated by the Action Statement.

During normal plant operation, gaseous sources entering into the unit vent are also monitored by other EMF systems prior to being sampled by EMF 35/36/37.

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