05000369/LER-1981-098, Forwards LER 81-098/03L-0.Detailed Event Analysis Encl

Forwards LER 81-098/03L-0.Detailed Event Analysis Encl

ML20009C650
Person / Time
Site:	McGuire
Issue date:	07/10/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C651	List: 05000369/LER-1981-098, Forwards LER 81-098/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-098-03, /03L-0:on 810521,routine Surveillance Revealed That Periodic Channel Check of Condenser Discharge Header Isolation Valve Low Flow Interlock Was Omitted from Preventive Maint Computer Data Base.Cause Unknown
References
NUDOCS 8107210316
Download: ML20009C650 (3)

LER-1981-098, Forwards LER 81-098/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981098R00 - NRC Website

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DUKE POWER COMPANY Powna Butt.onwo 422 Sourn Cnuncu STazzT, CnARt.oTTz. N. C. 2s242 wiwam o. ernaca,sn.

July 10, 1981 Vicr PmEslOf MT TELEP'uONE: AaEA 704 STEAme PRODUCTIOw 373-4083 Mr. J. P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta S* eet, Suite 3100 v

Atlanta, Georgia 30303 6

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O ff,8 r7f Re: McGuire Nuclear Station Unit 1 p

Docket No. 50-369 M

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Dear Mr. O'Reilly:

%.y i Please find attached Reportable Occurrence Report R0-369/81-98. This report concerns Technical Specification 4.3.3.8, "Each radioactive liquid effluent monitoring instrumentation channel shall be demonstrated operable by perform-ance of the channel check, source check, channel calibration, and channel functional test operations at the frequencies shown in Table 4.3-12.

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.

g PBN:scs Attachment cc: Director Mr. Bill Lavallee Office of Management & Program Analysis Nuclear Safety Analysis Center U. S. Nuclear Regulatory Commission P. O. Box 10412 P.3 o Alto, California 94303 Washington, D. C.

20555 1

Ms. M. J. Graham - NRC Resident Inspector McGuire Nuclear Station 5

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8107210316 810710 PDR ADOCR 05000369 S

PDR

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MCGUIRE NUCLEAR STATION REPORTABLE OCCURRENCE Report Number:

81-98 Report Date: July 10, 1981 Occurrence Date: May 21, 1981 Facility: McGuire Nuclear Station, Unit 1, Cornelius, North Carolina Identification of Occurrence:

The Condenser Circulating Water System (RC) discharge header minimum flow interlock was declared inoperable.

Condition Prior to Occurrence: Mode p, Cold Shutdown IlhQ Description of Occurrence:

f The Condenser Discharge (RC) Header is equipped with an isolation valve that will isolate on high radiation or low flow.

The low flow interlock will be engaged if a Condenser Circulating Water pump is not running during a release.

This ensures that an adequate dilution rate exists during the discharge of radioactive fluid.

The Preventive Maintenance (PM) Program ensures that all equipment is properly maintained. The periodic check of the isolation valves low flow interlock was om.itted from the PM. computer data base. The retest was required on May 21, 1981-and the omission was discovered during routine surveillance on June 11, 1981. By missing the retest, the plant entered a degraded mode of operation as stated in Technical Specification 4.3.3.8 (4d).

Apparent Cause of Occurrence:

The periodic channel check of the isolation valve's low flow interlock was omitted from the PM computer data base, the reason for which is unknown.

Analysis of Occurrence:

The condenser discharge isolatior valve's channel check was apparently overlooked when the FM Program was entered - o the computer base.

Corrective Action

When it was determined that the isolation valve's low flow interlock channel check had been omitted, it was immediately tested and found to be operable.

The PM computer program was corrected and reviewed to ensure that similar incidents will not occur.

Pag 3 Two MCGUIRE NUCLEAR STATION REPORTABLE OCCURRENCE

Safety Analysis

Since there was no radiation present, the health and safety of the public were not affected by this incident.

If the plant has been operating, there still would have been no adverse effect to the public. The interlock was actually operable throughout the entire time that it was administrative 1y declared inoperable.

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