ML19275A245

LER 79-031/03L-0:on 790829,seal Water Piping Found Cracked on Short Pipe Nipple Section Where Threaded Into Seal Cartridge.Caused by Operator Using half-inch Piping as Foot Support.Pipe Nipple Replaced

ML19275A245
Person / Time
Site:	Oyster Creek
Issue date:	09/28/1979
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19275A239	List: ML19275A238 ML19275A245
References
LER-79-031-03L, LER-79-31-3L, NUDOCS 7910030382
Download: ML19275A245 (3)

Text

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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EVENT DESCRIPTION AND PROBABLE ' CONSEQUENCES h O 2 l During normal operation, CRD pump was removed from service due to ,

I 0 3 1 excessive leakage from a seal water pipina connection. The pipino was I o !4 1 found to be cracked on a short pipe nipple section where it is threaded l

[TE l into the seal cartridge. The safety significance of this event is con- I t o is I sidered minimal because of the availability o' a redundant pump. 1 0 12 l 1 1

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1 9 @l10 NA 7910080 .3 FR l 7 8 9 80 PUB L ICITY NRC USE ONLY iSSUEC DESCRIPTION 2 n l Y j 44 l Weekiv news release - October 2. 1974 l d'Illllll lll e 9 1C 68 69 go, teAME OF PRED ARER Donald A. Ross PHONE: 20'-455-8784

- Jersey Central Power & Light Company

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yp g-) Madison Avenue at Punch Bowl Road Morristown, New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/79-31/3L-C Report Date September 26, 1979 Occurrence Date August 29, 1979 Identification of Occurrence "B" CRD hydraulic pump was removed from service to repair leaking seal water piping. This event is considered to be a recortable occurrence as defined in the Technical Specifications, paragraph 6.9.2.b.2.

Conditions Prior to Occurrence Load changes during routine power operation were being made.

Power: Core, 1704.3 MWt Electric, 554 MVe Flow: Recirculating 15.4 x 10 gpm 4 Feedwater, 6.341 x 10 6 lb/hr Stack Gas Activity: 32,100 pCi/sec.

Description of Occurrence "B" CRD hydraulic pump seal water piping connection on the outboard seal was found to be leaking on Wednesday, August 29, 1979, at approximately 1620 hours0.0188 days <br />0.45 hours <br />0.00268 weeks <br />6.1641e-4 months <br />.

The "A" control rod drive pump was placed into service and the "B" pump removed from service and isolated for the purpose of performing corrective maintenance.

On August 30, 1979, at 1602 hours0.0185 days <br />0.445 hours <br />0.00265 weeks <br />6.09561e-4 months <br />, the "B" control rod drive pump was placed into service and considered operable.

Apparent Cause of Occurrence The seal water piping was found to be cracked on a short pipe nipple section where it is threaded into the seal cartridge. Failure of the piping is attributed to use of the 1/2" piping as a support by operators during valving operations in the area.

17',2 296 Jersey Central Power & Light Compey is a Member of the Genera! Pub'c Ut '.t.es System

Reportable Occurrence No. 50-219/79-31/3L-0 Page 2 September 26, 1979 Analysis of Occurrence in addition to supplying drive cooling and accumulator charging pressure, the control rod drive hydraulic system can provide high pressure coolant injection capability. For break sizes up to 0.002 ft.2, a single control rod drive pump with flow of 110 gpm is adequate for maintaining the reactor water level nearly five feet above the core, thus alleviating the necessity for electromatic relief valve actuation. The safety significance of this event is considered to be minimal, since the redundant pump was operable.

Corrective Action The "B" control rod drive pump was removed from service, isolated, and the pipe nipple replaced. Af ter completion of the corrective maintenance, the "B" control rod drive pump was placed into service. A memorandum has been issued to operations and maintenance personnel to stress the importance of not using small pipes as a suppo.*t when climbing or rigging equipment.

Failure Data 1/2" pipe Material - Carbon Steel 7

1::2 299