ML19317F393

RO 270/77-02:on 770213,reactor Bldg Spray Valve 2 BS-2 Found Inoperable.Caused by Valve 2BS-2 Closing Too Hard on Valve Seat.Valve Manually Cycled to Unseat Valve & Torque Switch & Closing Limit Switch Reset

ML19317F393
Person / Time
Site:	Oconee
Issue date:	02/11/1977
From:	DUKE POWER CO.
To:
Shared Package
ML19317F390	List: ML19317F389 ML19317F393
References
RO-270-77-02, RO-270-77-2, NUDOCS 8001140643
Download: ML19317F393 (1)

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' DUKE POWER COMPANY OCONEE UNIT 2' Report No.: lR01270/77-2 R'eport Dlste: . February .11,'1977 '

Occurrence Date: ; January.13, 1977 Facilltyi : deonee' Unit: 2,7 Seneca', South Carolina

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'Inoperabl'e Reactor Building spray valve Identifica' tion of Occurrence:- ~

-Conditions Prior tofoccurrence: . Unit-at 100 percent full power

Descrirtion of Occurrence:

On. January 13,1 1977, while performing a periodic Reactor Building isolation Reactor' Building spray valve, 2BS-2, was discovered y valve.' functional test,As' required by Oconee Technical Specification 3.3.7, inoperable. The torque andthe operability-of?the redundant valve, 2BS-1, was verified.

closing limit switches of valve 2BS-2 were adjusted and the valve was 4

tested and returned to. service'within six hours.

Ayparent Cause of occurrencel d on the valve seat

.This incident resulted from valve,-2BS-2, closing too har

- which -cau'se'd the valve to. stick when. it was cycled.

Analysis of Occurrence:_

Oconee Technical. Specification 3.3.5 allows-the removal of one' train of the This-

-Reactor Building spray system for a period notito# exceed 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

incident resulted in the loss of one train}of the' Reactor Building spray ble, system

.for six hours. h redundant train, which had been verified iopera in the event Jretained-full

oflan ES' actuation.

capacity.-to perform its' intended nafety funct onIt.is cons

!during-which.the Reactor Building spray . valve, 2BS-2, was ino'perable and the

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operability of the redundant componen:c that the health and safety of the

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- ,public were n6t affected by this-occurrence.: -

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Corrective Action:-

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? Valve 2BS i 2 was: manually; cycled,.to The unscat the. valve valve'was andop'erabic verified the torque switch-

.and the: closing;11mit switch were reset; !

Oconee Unit 1)

% -:and returned to service. ; The(Reactor Building--spray valves' on '30, .

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_f m fand 3lhad(been tested during routine. quarterly (maintenance on Decem erit-is co

" .:1976iand had beeniverified! operable. -

lcorrectivejaction'is... ecessary.3 n g ,1 ,

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