ML19317F378

RO 270/77-06:on 770405,low Pressure Injection Valve 2LP-21 Failed to Open.Caused by Loose Set Screw on Pinion Gear of Valve Motor Shaft.Valve Repaired

ML19317F378
Person / Time
Site:	Oconee
Issue date:	05/04/1977
From:	DUKE POWER CO.
To:
Shared Package
ML19317F375	List: ML19317F374 ML19317F378
References
RO-270-77-06, RO-270-77-6, NUDOCS 8001140632
Download: ML19317F378 (1)

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Report No.: ;RO-270/77 LReport Date: 1May 4,;1977

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2 Occurrence Date,: April 5, 1977-Facil'ity:_f0conce Unit 2, Seneca, South Carolina Low pressure injection valve, 2LP-21 failed

Identification of-Occurrence:

to open Conditions' Prior to Occurrence: 100 percent full -power D'escription ' of.' Oc'currence:

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On, April 5,1977, while' performing a-Reactor Building Spray (RBS) system The valve, which is' located

' on-line test,, valve 2LP-21; f ailed to open.

in the."A" train of the RBS. system, controls one train of the borated ~

water supply from the borated water storage tank.to the RBS system and

' the Low Pressure Injection. (LPI) system. The redundant valve 2LP-22 was.

trains-

verified ope';able thus verifying the operability of the redundant lof'RBS'and LPI. Valve _2LP-21 was returned to-service within eight hours.

4 arent Cause of Occurrence:

Valve 2LP-21 failedLdue to a loose set screw on'the pinion gear of the-3 motor shaf t of: the valve.

~ Analysis of70ccurrence:

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--.This; occurrence resul'ted'..in the loss of one train. of. the LPI system an one: train of the Reactor. Building Spray system for approximately eight~

1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.--;During this period. the redundant trains' were operable and had -

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It is full capability.to'. perform the ES functions of the systems.

therefore concluded that'this' occurrence did not-adversely affect'the

' health and' safety of the public.

Corrective Action:

Valve'2LP-21;was repaired and-its operability. verified.

This occurrence

- was'airandom 'e'quipment. failure and therefore it is.f elt that no' further

corrective' action 11s necessary.

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