ML20052A395

Forwards LER 82-009/01T-0.Detailed Event Analysis Encl

ML20052A395
Person / Time
Site:	Oconee
Issue date:	04/09/1982
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20052A396	List: ML20052A395 ML20052A399
References
NUDOCS 8204280295
Download: ML20052A395 (2)

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DUKE POWER COMPANY ,

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422 Sours Cuumen Stazzi, CnAnwitz, N. C. nea4a wiwAe4 o. PAR MER,JR. l ? [, p p ;',, n vier Perssernet tgggy,,g gj, 4 sir.o. p.ooverson. $

April 9, 1982 Mr. James P. O'Reilly, Regional Administrator 9 O U. S. Nuclear Regulatory Commission p .g, Region II , , '20 101 Marietta Street, Suite 3100 g ,9 #

Atlanta, Georgia 30303 .af g

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0 Re: Oconce Nuclear Station [ di. - .. 8 Docket No. 50-269 Q:{'i^fD s

Dear Mr. O'Reilly:

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Picase find attached Reportable Occurrence Report R0-269/82-09. This report is submitted pursuant to Oconee Nuclear Station Technical Specification 6.6.2.1.a(9), which concerns the discovery of conditions not specifically considered in the' safety analysis report or Technical Specifications that require corrective measures to prevent the existence or development of an unsafe condition, and describes an incident which is considered to be of no significance with respect to its effect on the health and safety of the public.

Very truly yours, 1

N. . . ($, ,

William O. Parker, Jr.

JFK/php Attachment cc: Document Control Desk Records Center U. S. Nuclear Regulatory Commission Institute of Nuclear Power Operations Washington, D. C. 20555 1820 Water Place Atlanta, Georgia 30339 Mr. W. T. Orders NRC Resident Inspector Oconee Nuclear Station ovescist coI,Y 1&a g 2 0 4 2 8 OM S' s

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DUKE POWER COMPANY OCONEE NUCLEAR STATION UNITS 1 AND 2 i

Report Number: R0-269/82-09 Report Date: April 9, 1982-Occurrence Date: March 29, 1982 Facility: Oconee Units 1 and 2, Seneca, South Carolina Identification of Occurrence: Reactor Building Hydrogen Analyzer System Differential Pressure Regulators had ruptured diaphragms.

Conditions Prior to Occurrence: Oconee 1 100% FP Oconee 2 Cold Shutdown ,

D,scription e of Occurrence: While troubleshooting a low sample flow alarm on the Unit 1 Channel B hydrogen analyzer,'the differential pressure regulator for the oxygen supply was found with the diaphragm ruptured. Subsequent investiga-tion found 5 of 12 regulators with ruptured diaphragms.

Apparent Cause of Occurrence: The apparent cause of this occurrence-is a manufacturing deficiency in that in three cases, the panels with defective regulators' had not been used prier to this incident. The regulators would have to have been exposed to a backpressure substantially higher than.the norma) operating pressure to cause the ruptured diaphragm.

Analysis of Occurrence: The Reactor Building Hydrogen Analyzer System is normally secured, and is operated only under accident conditions. This problem was found during functional testing prior to system turnover to Operations.

The defective regulator caused a low sample flow alarm and common alarm, preventing proper operation of-the analyzer. This led to the identification of several ruptured diaphragms in the Reactor Building Hydrogen Analyzer System pressure regulators. Since this system was undergoing functional testing. prior to operation it is felt that the health and safety of the public were not affected by this incident.

Corrective Action: The defective diaphragms will be replaced prior to comple-l tion of system function testing and turnover to Operations.

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