ML17266A456

LER 81-017/03L-0:on 810417,during Cold Shutdown, Surveillance Stroke Times for HCV 14-1,2,6 & 7 Were Out of Spec.Caused by Approved Mod to Valves to Facilitate Opening in Emergency.Minor Design Change Performed

ML17266A456
Person / Time
Site:	Saint Lucie
Issue date:	05/15/1981
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17209B107	List: ML17209B106 ML17266A456
References
LER-81-017-03L, LER-81-17-3L, NUDOCS 8105270105
Download: ML17266A456 (3)

Text

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>>VENT OESCRIpTION'ANO FAOSASLS CONSSCUEPICSS Qlg Ourin a recent. outa e. cold shutdown surveillances were-bein erformed when it. was, found. that the stroke. times. for HCV. 14-1,2,6 and; T (G.C;!A. sup-ply and return isolation valves for the RCPs were out of s ecification The plant remained in a cold shutdown condition per T.S.3.6.3'..1d.

This, is the. first, LER of this, type., The valves. were- satisfactorily stroked, after* the, modification discussed. i'n Cause- Oescription below.

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Reportable Occurrence Event Report, 335-81-.17'.icensea Pa e?'n.

June 1? 1980,, a; reactor: trip occurred. as a result of an- electrical failure of RCP C.C W.. isolation valves. A natural circulation. cooldown. was required because cooling of. the RCP'eals could not. be reinitiated in a timely manner. A modification to these valves, was made to allow for emergency quick-opening..

HCV 14-1,2,6 and, 7 are air, operated: valves and the modification made was. to attach flexible hoses. directly to the. exhaust ports, of the air operators.:

These.- hoses can. be connected:;: via. quick-disconnects to~ a'. nitrogen supply- in an emergency- to open: the valves.. Before: returning to power the valves, were.

tested and. the stroke times. were. satisfactory A reactor trip occurred. on. April 16 1981', due to'; transformer failure. On, April. 17,.198L, HCV- 14-1'.,Z,6~ and; T were stroked'uring; cold. shutdown, surveillances. and the: stroke. times were excessive It. was found, that. the flexible hose was- restricting. airflow- through these.. valves A; new.

modification was made in. which- a, tee. was attached! to the exhaust port',. the hose. was connecteL to one sid'e of the tee and; a, valve was- connected to the other; side This. allowed. for a. more; free flow; of exhaust: air and. this times'ack i'nto specification- In an: emergency the valve. can, be. brought'troke closed' the hose attached: to. a; nitrogen supply. and the- C;C W supply valves'eopened and.'eturn:

gw 2 s 1981

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