ML19338D587

LER 80-014/03L-0:on 800822,concentrated Boric Acid Storage Tank Pump Removed from Svc Due to Oil & Flange Leaks.Caused by Torn Oil Seal,Worn Worm Gear,Bad Flange Gasket & Stuck Pressure Relief Valve.Items Replaced

ML19338D587
Person / Time
Site:	Oconee
Issue date:	09/19/1980
From:	Jackie Jones DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML16148A357	List: ML16148A356 ML19338D587
References
LER-80-014-03L-01, LER-80-14-3L-1, NUDOCS 8009230504
Download: ML19338D587 (3)

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avsNT QESCM PTION AMO PROSAata CCMSEQUENCU h sj lThe Unit 2 CBAST pump was removed trom service-for maintenance when an oil  ;

p gleak and a flange leak were discovered during ,the cleanup of the CBAST room. g ITT71 IThe pump was repaired and returned to service well within the time permitted. i m g Technical Specification 3.2.2 allcus the pump to be inoperable for 72 hotrs if y

gi the BWST is available for emergency boration.

f Since the BWST was available and ,

. [Tr71 [the CBAST pump was returned to service within the time allowed, this incident wgs of no significance witn respect to sate operation, and tiie neau.a anu safety of 1.1t.4,,J l ebe nublic were not a f f ec ted . ~

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. l@ I Y19 l9 I9I g CAUSE OESCRIPTICN AND CCMAECnVE ACr!C?t$ 77 .,

, m [This incident was due to a torn oil seal, a worn vorm gear, a bad flange gasket,;

g land a stuck pressure relief valve.

These items were. replaced with new ones, a ,

i m lperformnce test was performed, and the pump was declared operable.

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DUKE POWER COMPANY

OCONEE NUCLEAR STATION, UNIT 2 t Report Number

RO-270/80-14 i

Report Date: September 19, 1980 Occurrence Date: August 22, 1980 '

Facility: Ocot.se Unit 2, Seneca, South Carolir.a -

4 ldentification of Occurrence: CBAST Pump Removed From Service For Maintenance j

Conditions Prior to Occurrence: 59% FP  ;

Description of Occurrence:

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At 0700 on August 22, 1980, the Unit 2 Concentrated Boric Acid Storage Tank (CBAST) pump was removed from service. An oil seal, flange gasket, worm gear set, and pressure relief valve were replaced. The rump was returned to service l

and declared operable at 0115 on August 24, 1980. This constitutes operation in a degraded mode per Technical Specification 3.2.2 and is thus reportable pursuant to Technical Specification 6.6.2.1.b(2). )

Apparent Cause of Occurrence:

maring the cleanup of the CBAST room, an oil leak and a flange leak were discovered on the CBAST pump. Work requests were written for inspection and repair. During the inspection, the oil seal was found to have been torn and the worm gear showed some wear.

I was installed. The flange leak The oil ~ seal was replaced, and a new worm gear set was repaired by installing a new gasket. The pump would not pump water when it was tested for operability. The pressure t

relief valve was found to be stuck, and it was replaced and set to the desired pressure.

A parformance test was run and the pump was declared operable at 0100

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on August 24, 1980.

I Analysis of Occurrence:

The ability to achieve the necessary shutdown margin in the event of an accidert is dependent on the ability of the unit to borate the primary system. The primary method- for accomplishing this is the use of the CBAST Pump. When the CBAST Pump is inoperable, the system can be borated by using the Borated Water Storage Tank (BWST) to feed the high pressure injection pumps directly. The  !

BWST was available while the CBAST pump was inoperable, thus insuring a means 1 of safely shutting the unit down. Furthermore, the pump was restored to l operability Thus, well within the '72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> permitted by Technical Specification 3.2.2.

this incident is considered to be of no significance with respect to safe ,

operation, and the health and safety of the public were not affected.

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Corrective Action:

After the leaks were discovered; a new oil seal was installed to replace the torn one; the worm gear set was found to have some wear and was replaced as a preventive ceasure; the gasket was replaced on the leaking flange; and the Physical Maintenance procedure will be changed to reflect oil seal and flange inspections. A station modification will be initiated to add an additional pump to the system and/or replace the existing pump with one of a different type.

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