05000219/LER-1980-062-03, /03L-0:on 801218,control Rod Driveline Pump NCO8A Failed in Svc.Caused by Failure of Pump Shaft Outboard of Balancing Disc.Pump Internals & Motor Replaced

/03L-0:on 801218,control Rod Driveline Pump NCO8A Failed in Svc.Caused by Failure of Pump Shaft Outboard of Balancing Disc.Pump Internals & Motor Replaced

ML19341A461
Person / Time
Site:	Oyster Creek
Issue date:	01/16/1981
From:	Crosby P JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19341A459	List: 05000219/LER-1980-062, Forwards LER 80-062/03L-0 05000219/LER-1980-062-03, /03L-0:on 801218,control Rod Driveline Pump NCO8A Failed in Svc.Caused by Failure of Pump Shaft Outboard of Balancing Disc.Pump Internals & Motor Replaced
References
LER-80-062-03L, LER-80-62-3L, NUDOCS 8101230564
Download: ML19341A461 (3)

LER-1980-062, /03L-0:on 801218,control Rod Driveline Pump NCO8A Failed in Svc.Caused by Failure of Pump Shaft Outboard of Balancing Disc.Pump Internals & Motor Replaced

Event date:
Report date:
2191980062R03 - NRC Website

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i o i 4, ; able under T.S. 6.9.2.b(2). The redundant pump was imadiately started l

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.1 CAUSE DESCRIPTICN AND CORRECTIVE ACT1CNS

i,o; l The cause was due to a failure of the pump shaft outboard of thle i,,,, ; halancing disc. 'Ihe pup internals and the pump motor were ranlaW. Se i

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o, OYSTER CREEK NUCLEAR GENERATING STATICN Forked River, New Jersey 08731 Li==aa Event Beport Wi.able Occus2=cs No. 50-219/80-62/3L Report Date January 16, 1981 Occust-ce Data Decenber 18, 1980 Identification of Ocetui=ce Operation in a degraded mode pemitted by a limiting condition for operation per T W iral Specifications, section 3.4.D.2 when Control Bod Drive (CED) Hydraulic Pung NC08A failed in service, mis event is considered to be a reportable occurrence as Aaf4naA in the Technical Spe::ifications, paragraph 6.9.2.b(2).

Conditions Prior to Occiutarce

%e plant was operatirs at steady state. Major plant parameters at the time of occurrence were:

Power:

Core 1837 MWt Electrical 610 MWe 4

Flow:

RecLhtion 15.5 x ig p Faa^ ater 6.8 x 10 lb/hr Da=crintion of Ocearrence On Thursday, W218,1980, at about 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> the operati:q Control Rod Drive Hydra"14e Ptmp (NC08A) failed as indicated by alarms and decreasing pressure indications in the control rocm. The operators i w iately started the standby CRD ptmp and stopped the "A" punp which restored the systen to normal.

Visual inspection initially indicated that the motor for the "A" CRD punp had failed. The puup was isolated and tagged out of sertice.

Apparent cause of Occurrence The failure was caused by the caplete break of the punp shaft out!: card of the balancing disc. This in turn also caused the noter to overheat due to excessive load. The cause of the pump shaft failure has rot been de+aminad yet, however, the nest probable cause was loosening of the thrust bear 2ng aligmant pins.

Reportable Occh= cs Page 2 Report No. 50-219/80-62/3L Analysis of Occurrence In addition to supplying control rod drive cooling and =m=1ator chanJ ng i

pressure, the ocntrol rod drive hydran1f r system also has the capability to provide high pressure coolant injection. For pipe break sizes up to 0.002 ft.2, the flow frm a single control rod drive pump is adequate for maintaining the reactor vessel water level nearly five feet above the core, thus alleviating need for auto-relief actuation. Considering that the redundant pung ram =4nad operable while repairs were made the safety significance is considered minimal.

Corrective Action

After the punp was renoved frm service further investigation revealed that the pmp shaft had failed at a point outboard of the balancing disc. There was no other evidence of damage other than material being remved frcm the wear rings. The pung notor was also renoved for inspection, cleaned and reins 1.tlated.

Megger raadinen were taken and indicated near infinite resistance. The pung was reassenbled with all new ocmponents and the notor was reinstalled on nar=haz 22, 1980. The pmp was started and ran for five hours when the pump tripped on overload. The standby pung was placed in service and the "A" pung notor was again ins g M. Megger readinas were taken and indicated zero resistance to ground. 'Ibe notor was then relaM with a spare.

At about 0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> on DM hl 24, 1980 the pmp was returned to service after ccmpletion of an operability check.

Failure Data Pung W3rthington Pmp Corp.

Type 2W E810 Diffuse type centrifugal pump Serial #1613735 Motor Canaml Electric Custom 8000 Horizontal Induction M:rtor i

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