ML20009E347

RO 81-030/01P-0:on 810714,during Required Surveillance at steady-state Power Standby Gas Treatment Sys 1 Failed to Start & Reactor Bldg Main Exhaust Valve V-28-22 Failed to Close.Caused by Faulty Tube Flow Sensor

ML20009E347
Person / Time
Site:	Oyster Creek
Issue date:	07/15/1981
From:	Carroll J JERSEY CENTRAL POWER & LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RO-81-30-01P, RO-81-30-1P, NUDOCS 8107280068
Download: ML20009E347 (3)

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Directorate of RegulaIory Operations Region I a 631 Park Avenue King of Prussia, Pennsylvania 19406 FFOM: Jersey Central Power & Light Capany Oyster Creek Nuclear Generating Station Docket No. 50-219 Forked River, New Jersey 08731 SU1MECT: Reportable Occurrence Report No. 50-219/81-30/0lP

'Ihe following is a preliminary report being e,f subnitted in cmpliance with the Technical 4 g. g Specifications, paragraphs 6.9.2.a.2 and dl '

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Office of Managonent Information and Program Control U.S. Nuclear Regulatory Ccmnission Washington, D. C. 20555 NBC Resident Inspector (1)

Oyster Creek Nuclear Generating Station Forked River, N. J.

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CYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731

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Licensee Eveat Report Reportable Occurrence No. 50-219/81-30/0lP Report Date July 15, 1981 Occurrence Date July 14, 1981 Identification of Occurrence The failure of reactor building main exhaust valve V-28-22 to close resulted in a violation of Secondary containment integrity as defined by the Technical Specifications, section 1.14C and 3.5.B.l. 'Ihe plant was also operating in a i degraded mode as pennitted by a limiting condition of operation as given in l' Technical Specifications section 3.5.B.3 when Standby Gas Treatment S/ sten #I failed to start. (

Th.ts event is considered to be a reportable occurrence as MMima in the Technical i

Specifications, paragraphs 6.9.2.a.2 and 6.9.2.b.2.

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

l Major Plcat Parameters Power: Reactor 1409 FMt Generator 370 MWe Flow: Recirculation 4 11.1 x 10 y Feedwater 4.18 x 106 lb/hr l Description of Occurrence l On Tuesday, July 14, at 1910 hours0.0221 days <br />0.531 hours <br />0.00316 weeks <br />7.26755e-4 months <br />, Standby Gas Triat2nent Systeu #I failed to

start during performance of required surveillance. At the same time reactor building main exhaust valve V-28-22 failed to close. However, valve V-28-21, the reactor building main exhaust valve in series with V-28-22, clnaad as it should have. At 1930 hours0.0223 days <br />0.536 hours <br />0.00319 weeks <br />7.34365e-4 months <br /> the testing of SGTS II was empleted and SGrS II was l denonstrated operable. The flow sensor for SGTS I was worked on and at approxi-l mately 2315 hours0.0268 days <br />0.643 hours <br />0.00383 weeks <br />8.808575e-4 months <br /> SGTS I was lined up properly, but V-28-22 still failed to close.

E On Wednesday, July 15, at approximately 830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br />, the reactor biilding ventilation ,

was secured and SGrS II was initiated. Again V-28-22 failed to close and upon recognition of a Te.hnical Specification violation, an orderly plant shutdown l was cmmenced at 840 hours0.00972 days <br />0.233 hours <br />0.00139 weeks <br />3.1962e-4 months <br />. At 1018 hours0.0118 days <br />0.283 hours <br />0.00168 weeks <br />3.87349e-4 months <br />, vahe V-28-22 was manually closed r l and t.he shutdown was halted. L l

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Reportable Occurrence Page 2 l Report No. 50-219/81-30/0lP Apparent Cause of Occurrence The cause of SGTS I failure to start was apparently due to a probl e with the pitot tube flow sensor. Se cause of the failure of V-22-28 to close was due to a faulty solenoid. Recognition of the inability of V-28-22 to isolate and the fact that this is a Technical Specification requirment necessitating a plant shutdown was overlooked due to the problems being encountered with the Standby Gas Treatment Systm.

Analysis of Occurrence he Standby Gas Treatment System is designed to filter and exhaust reactor building atmosphere to the stack during secondary containment isolation conditions.

Upon initiation of either SGTS, valves V-28-21 and V-28-22 will automatically close to isolate the reactor building exhaust.

The safety significance of this occurrence is minimized by the fact that the redundant SGTS was operable. It is also minimized because valve V-28-21 performed its function of isolating the reactor building exhaust. Although section 1.14C of the Technical Specifications requires both V-28-21 and V-28-22 to be closed j to satisfy secondary containment integrity requirments, the closure of one of the valves functionally meets the requirements of isolating the reacter building exhaust.

Corrective Action In an attspt to properly line up SGPS I, the belts on exhaust fan EF 1-8 were checked ar d found in order (EF1-8 exhausts frcan SGTS I to the stack) . The flow sensor for SGrS I was worked on and was adjusted to properly sense full flow.

A reactor shutdown was initiated and subsequently valve V-28-22 was manually closed and secured. Repairs to the solenoid have been cmpleted and valve V-28-22 is again operational.

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