05000219/LER-1981-005-03, /03L-0:on 810106,emergency Svc Water Pump 52B Current & Discharge Pressure Found Outside Tech Spec. Probably Caused by Clogged Pump Suction Strainer.Strainer Cleared

/03L-0:on 810106,emergency Svc Water Pump 52B Current & Discharge Pressure Found Outside Tech Spec. Probably Caused by Clogged Pump Suction Strainer.Strainer Cleared

ML19339C840
Person / Time
Site:	Oyster Creek
Issue date:	02/05/1981
From:	Fitzgerald M JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19339C839	List: 05000219/LER-1981-005, Forwards LER 81-005/03L-0 05000219/LER-1981-005-03, /03L-0:on 810106,emergency Svc Water Pump 52B Current & Discharge Pressure Found Outside Tech Spec. Probably Caused by Clogged Pump Suction Strainer.Strainer Cleared
References
LER-81-005-03L, LER-81-5-3L, NUDOCS 8102120072
Download: ML19339C840 (3)

LER-1981-005, /03L-0:on 810106,emergency Svc Water Pump 52B Current & Discharge Pressure Found Outside Tech Spec. Probably Caused by Clogged Pump Suction Strainer.Strainer Cleared

Event date:
Report date:
2191981005R03 - NRC Website

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40 41 42 43 44 47 CAUSE DESCRIPTiCN AND CORRECTIVE ACTIONS I i i o I l The cause was attributed to a clogged pump suction strainer. The pump g,,, strainer was cleared by use of a service air connection to the suction

, piping, and the pump was tested again and the new data was acceptable,

, The renauung ESW pumps were also te. ted and shown to be operable as required by the Technical Specificatitas, paragraph 3.1.C.4.

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OYSTER ue..K NUCLEAR CEFATING STATION Forked River, New Jersey 08731 Licensee Event Peport Paportable Occurrence No. 50-219/81-05/3L Peport Date February 5, 1981 Occurrence Date January 6, 1981 Identification of Occurrence The plant was operating under a degraded condition as permitted by limiting condition for operation per Technical Specification section 3.4.C.4, when Emergency Service Water pump 52B failed to denonstrate operability during planned testing.

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.

Major Plant Parameters:

Power:

Peactor 1698 MWt Generator 590 bW 4

Flow:

Recirculation 14.7 x 10 #

6 Feedwater 6.24 x 10 lb/hr Description of Occurrence On Tuesday, January 6, a special run of the " Containment Spray and Bnergency Service Water Punp Cperability Test" (surveillance procedure 607.4.001) was perfonned in order to check installed anmeters. During this test Emergency Service Water (ESW) pump 52B was found to draw less than 10 amperes current and was found to have a value of 0 psig for its discharge pressure. The acceptable values are 53 + 3.0 amperes for the pmp current and >100 psig for the punp i

discharge pressure. The redundant ESW pmp in Systen I (punp 52A) passed all phases of its operability test.

Apparent cause of Occaw The apparent cause of the occurrence was a blocked punp suction strainer. The ESW punps are all located at the intake structure, along with the Sarvice Water, Circulating Water and Screen Wash p mps. There is a series of 6 trash racks and 6 traveling screens to keep as much debris as possible frun reaching the punp suction piping, however, enough debris passed through to block up the ESW 52B punp suction strainer.

A nodification to the trave'.ing screens to reduce emhnmental impact is not yet empleted and may have contributed to this condition.

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PeportableOcctErence Page 2 Paport No. 50-219/80-05/3L Analysis of Occurrence The nnergency Service Water System is used along with the Contamnent Spray Systan to re:ove fission product decay heat frcm the primary containment in the event of a loss of coolant accident. There are tw independent loops which can acccuplish this, each of which utilizes tw ESW pur:ps, two Contairinent Spray pumps, two heat exchangers, two drywell spray headers and all the necessary pipin3, instrumentation and valves. However, the systen is designed Fa that one ESN pump, one heat exchanger and one Contairsnent Spray pump caa pmide the necessary cooling. Since the lcop containing ESW pumps 52C ani 52D was operable, and since ESW pump 52A was operable, the safety significance of the occurrence is minimal.

Corrective Action

The i::rwiinte corrective action taken was to clear the pump suction line. There is a connection ca the pump suction piping which can be hooked up to the service air spt s Presmrized air is used to clear the strainer of clogged debris and allow proper pump suction. After clearing the strainer, pump 52B was tested again and the current drawn was 53 amperes and the discharge pressure was 110 psig, both acceptable values. Also, as required by Technical Specification paragraph 3.4.C.4, an operability test was performed on the retaining ESN pumps, which showed these systers to be operable.

Failure Data Manufacturer: Byron Jackson Type:

Vertical-Centrifugal, 3000 GPM; 1770 RPM t

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