05000369/LER-1981-067, Forwards LER 81-067/03L-0.Detailed Event Analysis Encl

Forwards LER 81-067/03L-0.Detailed Event Analysis Encl

ML20009F597
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
ML20009F598	List: 05000369/LER-1981-067, Forwards LER 81-067/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-067-03, /03L-0:on 810425,while in Mode 3 Initial Fuel Loading,Boron Concentration in Upper Head Injection Accumulator Sys Was 2,153 Parts Per Meter.Caused by Insufficient Purging Before Sampling.Pressure Reduced
References
NUDOCS 8107310342
Download: ML20009F597 (2)

LER-1981-067, Forwards LER 81-067/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981067R00 - NRC Website

text

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OFFICIAL CDPy DtTKE POWER COMPANY d)WER DUILDINO 422 SocTu Cncucu STHEET. CHARLOTrE, N. C. 28242 j

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May 22, 1981 373..c.3

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Mr. James P. O'Reilly, Director 4/

U.S. Nuclear Regulatory Commission [pl Region II

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101 Marietta Street, Suite 3100 b

Atlanta, Georgia 30303 Q7 C

JUL S 01981* ?g Re: McGuire Nuclear Station Unit 1

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Docket No. 50-369 comason

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Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-67. This report concerns the boron concentration in the UHI accumulator reaching 2153 ppm.

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

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V ry truly yours, N

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' William O. Parker, Jr.

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RWO:pw Attachment cc: 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 6.lj f

8107310342 810522 PDR ADOCK 05000369 S

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d McGUIRE NUCLEAR S1ATION INCIDENT PEPORT Report Number:

81-67 Report Date: May 25, 1981 Occurrence Date: April 25, 1981 Facility:

McGuire Unit 1, Cornelius, N.C.

Identification of Occurrence:

Boron concentration in the upper head injection (UHI) accumulator was 2153 ppm.

Conditions Prior to Occurrence:

At 1731 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.586455e-4 months <br /> on April 25, 1981, a chemistry analysis of the contents of the upper head injection accumulator system re-realed that boron concentration was 2153 ppm.

Since Technical Specification 3.3.1.2 requires that the concentration be between 1900 and 2100 ppm of boron, this incident was reportable.

Apparent Cause of Occurrence:

The normal makeup to the UHI accumulator enters near the bottom and the sample line comes off the bottam of the accumulator.

Also, insufficient purging before sampling could have contributed to the high boron reading.

Analysis of Occurrence:

The normal makeup to the UHI accumulator is from the Refueling Water Storage Tank (FWST).

The FWST was sampled on April 28 and the boron concentration was 2089 ppm.

The makeup enters the accumulator at one end near the bottom and the normal sample is taken from the middle of the accumulator on the bottom. An inspection of the sample line on >by 12 re-vealed that boron had plated out in the end of the line.

Since the makeup enters near the bottom and the sample is taken from the bottom, an insufficient purge of the sample line prior to taking a sample could contribute to a high boron concentration reading. A procedure caange will be incorporated into sampling procedure to purge the sample line until no boron crystals are visible.

Sa fef v Analysis: The UHI system is passive and only used during a loss of coolant accident.

Since there was only new fuel in the core, safe plant operation and the health and safety of the public were not affected.

If the reactor had been at power and a NC system break had occurred, the UHI system would have operated as designed since the boron concentration was only 53 ppm above the upper limit (2100).

Corrective Action

No corrective action was taken to reduce the boron concentratior in the UHI accumulator since the pressurizer pressure was reduced below 1900 psig at 1824 hours0.0211 days <br />0.507 hours <br />0.00302 weeks <br />6.94032e-4 months <br /> on April 25, 1981.

The sampling procedure will be changed to purge the sample line until ao boron crystals are visible prior to sampling.