05000321/LER-1980-007-03, /03L-0:on 800114,while Testing Standby Svc Water Pump,Pump Would Not Meet Criteria.Caused by Disengagement of Pump First Stage Impeller Lock Collet.Lock Collet Replaced & Pump Reinstalled

/03L-0:on 800114,while Testing Standby Svc Water Pump,Pump Would Not Meet Criteria.Caused by Disengagement of Pump First Stage Impeller Lock Collet.Lock Collet Replaced & Pump Reinstalled

ML19296A729
Person / Time
Site:	Hatch
Issue date:	02/06/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19296A723	List: 05000321/LER-1980-007, Forwards LER 80-007/03L-0 05000321/LER-1980-007-03, /03L-0:on 800114,while Testing Standby Svc Water Pump,Pump Would Not Meet Criteria.Caused by Disengagement of Pump First Stage Impeller Lock Collet.Lock Collet Replaced & Pump Reinstalled
References
LER-80-007-03L, LER-80-7-3L, NUDOCS 8002150340
Download: ML19296A729 (2)

LER-1980-007, /03L-0:on 800114,while Testing Standby Svc Water Pump,Pump Would Not Meet Criteria.Caused by Disengagement of Pump First Stage Impeller Lock Collet.Lock Collet Replaced & Pump Reinstalled

Event date:
Report date:
3211980007R03 - NRC Website

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,,o.111 Lpurinn normal, power operation while performinn operability testino on the Standby i

M i Service Water oumo, it was observed that the oumo would not meet the criteria soecif-l (p_F_]lied in the associated orocedure.

Isaintenance was initiated to determine and resolve l Lo !s] I the reason for failure.

Immediate action was taken to comoly with it!'P-2 Tech Scecs 1

to lE T4.b.J.2.a and HNP-2 Tech Specs section 3.7.1.2 by oerfomino the associated surveil-I r o l 7 l l_ lance set forth in tnose sections. There were no effects upon moblic health and l

.T:.Itsafety due to this event.

A similar event was reported in LER 53-321/1979-104.

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CAUSE DESCRIPTION AND CORnECTIVE, CTIONS @

l Investication revealed that the cause of failure was due tc t:e disencacement of the i

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l and functionallv tested satisfactorily folicwino re-installation of a new lock collet i i

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Licensee Name:

Georgia Power Company

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Facility Name:

Plant E. I. Hatch Docket No.:

50-321 LER No.: 50-321/1980-007

Narrative

Report for LER #1-80-007 During normal power operation, it was. discovered that the Standby Service Wat-er Pump (2P41-C002) would not meet the criteria set.forth in the surveillance g

procedure (HHP-1-3.182, "D/G MANUAL START") and ASME section 11-IUP resulting in the pump's being declared inoperable.

The plant was immediately declared in a Limiting Condition for Operation, and action was taken to comply with HNP-1 and HNP-2 Tech Specs by performing the requirements set forth in section 4.5.J.2. A and section 3.7.1.2 respectively.

In the process of corrective maintenance, an investigation revealed that the pump's first stage impeller had been rendered inoperable as the associated lock collet had become disengaged from the impeller and. shaft. This device serves as part of the driving mcchanism for the shaft-impeller assembly and is " pressed fit" on a taper between th'e two components according to specific dimensions to ensure proper attachment to the shaf t.

The exact cause of the lack colle't failure is not known but could be attributable to the pump being started while in reverse rotation. This condition nad, in fact, been observed prior to tne pump's fail-ure due to an inoperable discharge check valve. The check valve has been rep-aired to prevent recurrence. Since pump initiation during reverse rotation can cause possible damage, the pump shafting and other lock collets were inspect-ed for such damage with no consequential findings.

This problem is not generic since this is the only pump on site that has this method of impeller-to-shaft attachment.

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