ML19208B272

LER 79-030/03L-0:on 790812,control Rod Drive Pump Removed from Svc Due to Excessive Leakage from Pump Vent Piping. Piping Was Cracked at Bushing.Caused by Use of Vent Line as Operator Foot Support.Bushing & Pipe Nipple Replaced

ML19208B272
Person / Time
Site:	Oyster Creek
Issue date:	09/12/1979
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19208B265	List: ML19208B264 ML19208B272
References
LER-79-030-03L, LER-79-30-3L, NUDOCS 7909190445
Download: ML19208B272 (1)

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74 75 REPORT DATE 80 7 8 60 61 DOCKET NUME E R EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 l During normal operation, "A" CRD pump was removed from service due to [

excess'ive leakage from the pump vent piping. The piping was found to be l l O t 31 l cracked at the bushing where it enters the pump casing. The safety slo-  !

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44 4-CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i O] The cracking appears to be caused by an operator using the vent line as j i i [

a foot support. The affected bushing and a short pipe nipple in the line i

, 7 l were replaced and the pump returned to service. l 11 131 l i 4

- I 1 l 7 8 9 B0 STA  % POWE R OTHE R STATUS DISCO R DISCOVERY DESCRIPTION 1 5 [.E j@ l 019 18 l@l NA l l A l@l Operator Observation l ACTIVITY CO TENT RELE ASED OF RELE ASE AMOUNT OF ACTIVITY LOC ATION OF RELE ASE NA

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ISSUE W [,Y,,,j h l llllllll1ll}l Week 1v oress re l ea c:e - September 18. 1979 I 7 8 9 to 68 69 30 PHONE:

201-455-8784 NAME OF PREPARER

Jersey Central Power & Light Company y) f 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. 50-219/79-30/3L-0 Report Date September 12, 1979 Occurrence Date August 12, 1979 Identification of Occurrence "A" Control rod drive pump was removed from service for repair of pump vent piping. This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.b.2.

Conditions Prior to Occurrence The plant was operating at steady state power.

Power: Generator, 645 MWe Reactor, 1970 MWt Flow: Recirculating, 15.4 x 104 gpm Feedwater, 7.137 x 106 lb/hr Stack Gas Activity: 2.79 x 104 pCI/sec Description of Occurrence On August 12,1979, at 0331 hours0.00383 days <br />0.0919 hours <br />5.472884e-4 weeks <br />1.259455e-4 months <br />, "A" control rod drive pumo was removed from service due to excessive leakage from the pump vent piping. The piping was found to be cracked at the bushing where it enters the pump casing. After completion of the corrective maintenance, "A" CRD pump was placed into service at 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br /> on the same date.

Apparent Cause of Occurrence Vent piping was found to be cracked at the bushing where it enters the pump casing at the inboard end. The cracking appears to be caused by an operator using the vent line as a foot support.

O I" i,fj b 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 Jersey Central Power & Light Company is a Member of the General Pubhc Utaties System

Reportable Occurrence No. 50-219/79-30/3f.-0 Page 2 September 12, 1979 capability. For break sizes up to 0.002 ft.2, a singic control rod drive pump with a flow of 110 gpm is edequate 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 CRD pump was operable.

Corrective Action "A" CRD pump was removed from service and isolated. The bushing and a short pipe nipple in the inboard casing vent line were replaced. "A" CRD pump was placed in service after corrective maintenance. A memorandum will be issued stressing that operators should not use small piping as a foot support.

Failure Data Not appIlcable.

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