ML19256A816

LER 78-036/03L-0 on 781212:during Routine Tests,Standby Gas Treatment Sys II Discharge Valve V-28-30 Failed to Close. Caused by Buildup of Dirt & Corrosion in Piston Cylinder of Valve Operator

ML19256A816
Person / Time
Site:	Oyster Creek
Issue date:	01/10/1979
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256A811	List: ML19256A810 ML19256A816
References
LER-78-036-03L, LER-78-36-3L, NUDOCS 7901160195
Download: ML19256A816 (3)

Text

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- LICENSEE EVENT REPORT -

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REPORT DATE 80

? 8 60 61 DOCKET NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 0 2 During normal operation, while performing routine system surveillance l O 3 1 tests on December 12, 19 and 26,-Standby Gas Treatment System II dis- l 0 4 charge valve V-28-30 failed to close. After maintenance work following 1 l

(TITl [ each of the first two failures, the valve cycled without incident. The [

ITTE 1 valve again failed on the first attempt on December 26, but on subsequent i O 7 l system operations, the valve cycled properly. Safety significance of I O a l this event is considered minimal since SGTS I was operable each time. l 7 8 9 E CODE SU8C E COMPONENT CODE SUBCOdE S E 7

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O I The appa;ent cause of the incident was the buildup of dirt and corrosion l gl In the piston cylinder of the valve operator. The valve cyerator for I

, 7 Standby Gas Treatment System 11 discharge valve V-28-30 was replaced. I I

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'SYAh  % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION W (_E_J@ l1l0l0l@l NA l (_,Bj@l Routine Surveillance Test l ACTIVITY CO TENT RELE ASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE NA l NA l 1 6 [_Z_] @ [Z,_j@

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OESCRIPTION 7901160tcif Q W@l 7 8 9 10 NA 80 l

2 O IShS ED@DE l CRIPTION Weekly press release - January 16, 1979 l 68 69 lll ll l l l l l80lf5 7 8 9 10 NAME OF PREPARER PHONE:

Jersey Central Power & Ught Company

• 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. 50-219/78-36/3L-0 Report Date January 10, 1979 Occurrence Date December 12, 1978 Identification of Occurrence Failure of Standby Gas Treatment System 11 discharge vaive to operate.

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 major plant parameters at the time of the occurrence were:

Power: Reactor,1929 MWt Electrical, 672 MWe Flow: Recirculation, 15.8 x 10 4gpm Feedwater, 7 2 x 10 6 lb/hr Pressure: 1020 psig Stack Gas: 3.49 x 104 pci/sec Description of Occurrence On Tuesday, December 12, 1978, Standby Gas Treatment System 11 discharge valve V-28-30 failed to close following the performance of the routine system survelliance test. The valve was subsequently cycled by hand, and in follow-

~ lng operations, opened and esosed properly. At that time, maintenance per-sonnel checked the ope ator solenoid as it had been a problem in past failures.

The solenoid was in good working order and the valve was operating, though with some evidence of friction. Following the performance of the next scheduled sy, tem surveillance test on Tuesday, December 19, 1978, System 11 discharge valve V-28-30 again failed to close following the test. Performance of the valve was similar with no failures during subsequent operations.

Maintenance personnel inspected the valve operator and lubricated the piston cylinder. Again, the valve operated with no failures following the mainte-nance. On Tuesday, December 26, 1978, during performance of the scheduled system surveillance test, valve V-28-30 failed to open on the first attempt Jersey Central Power & Light Cornwny is a Member of tne General Public Utilities System

. r Reportable Occurrence No. 50-219/78-36/3L-0 Page 2 January 10, 1979 to initiate System II. On subsequent system operations, the valve cycled properly each time. Maintenance personnel have replaced the valve operator.

No further failures have been experienced.

Apparent Cause of Occurrence The apparent cause of the incident was the buildup of dirt and corrosion in the piston cylinder of the valve operator.

Analysis of Occurrence The Standby Gas Treatment System is designed to minimize the release of radio-active material to the environs during secondary containment isolation conditions by filtering the reactor building atmosphere prior to exhaust to the stack. Each of the two separate filter systems provide 100% capacity.

If one filter train becomes inoperable, there is no immediate threat to secondary containment. At the time of each occurrence, Standby Gas Treatment System I was demonstrated operable. Had conditions existed which required operation of the Standby Gas Treatment System, System I wou* ' have performed the required function.

Corrective Action The valve operator for Standby Gas Treatment System 11 discharge valve V-28-30 was replaced.

Failure Data Contromatic Pneumatic actuator Model #500SR Maximum pressure 120 psi Maximum torque 1720 In. Ibs.