ML20100R741

Special Rept 92-01:on 920227,CO2 Fire Suppression Sys for 4,160-volt Switchgear Inoperable for More than 14 Days When Leaking Valve Stem Repaired on 920226.Possibly Caused by Moisture Intrusion.Corroded Components Replaced

ML20100R741
Person / Time
Site:	Oyster Creek
Issue date:	04/10/1992
From:	J. J. Barton GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
92-01, 92-1, C321-92-2117, NUDOCS 9204170151
Download: ML20100R741 (2)

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GPU Nuclear Corporation

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nouie 9 soutn i f orked nnet.New Jersep 087310368 009 9714Xia Writer 5 Dam t Dial bumt.er 1992 April C321-92-10'2117 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

Oyster Creek Nuclear Generating Station Docket No. 50-219 Special Report No. 92-01 Enclosed is Special Report No. 92-01 which is submitted in accordance with technical specification 3.12.G.3.

If there are any questions, please call Mr. Michael Heller, licensing Engineer, at '609) 971-4680.

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JJ arton Vc President and Director 1 ys er Creek Enclosure cc: NRC Region 1 Administrator NRC Resident inspector Oyster Creek NRC Project Manager l

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fleport Date: April 10, 1992 Qtturrence Date: February 27, 1992 Identification of Occurrence: [

The carbon dioxide (CO 2

) fire suppression system for the 4160 volt switchgear  !

was inoperable for greater than 14 days which requires a special report per l technical specification 3.12.G.3.

Description of Occurrence:

On February 26, 1992, a CO, system valve stem leaking CO 2 was being repaired.

Removal-of insulation necessary to repair-the leakage revealed corroded pipe ,

and fittings which indicateJ the potential for failure of these components.

On February 27, 1992, it was decided to exhaust the C0 from the tank and make i repairs. The system was declared inoperable and a con inuous firewatch with backup fire suppression equipment was established in accordance with technical specification 3.12.G.2. ,

Corrective Action:

A thorough examination of the CO 2system was conducted. The corrosion is 1

attributed to moisture intrusion into the piping insulation and possibly electro galvanic reaction. The piping insulation, which was not an liFPA or vendor requirement for the original installation, was not and will not be ,

reinstalled to avoid future corrosion problems. Corroded components including the Cut tank were replaced and the syste:n was declared operable on March 27

- 1992 after successful completion of a system functional test.

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