ML19260D004

LER 80-005/03L-0:on 800110,w/unit in Mode 4,main Steam Isolation Trip Valve TV-MS101C Would Not Close Using Train a Push Button.Caused by Open Auxiliary Relay in Circuit. Relay Replaced from Stock & Tested Satisfactorily

ML19260D004
Person / Time
Site:	North Anna
Issue date:	02/06/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19260D001	List: ML19260C999 ML19260D004
References
LER-80-005-03L, LER-80-5-3L, NUDOCS 8002070228
Download: ML19260D004 (2)

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EVENTt, N Tion A o PPoa At c : cu o / l Dn J. i n n , rv 10, 1990, with the unit in W 4, an a t t . "- p t wa' made to c l ow rwin stoan ]

o a ] isolation trip valve TV "S10lC from the control roon. D.t r i nn this ef fort the valve o 4 l vould not close from the Train A pushbutton. Since the trip valve functioned properiv l o s lusine Train B pushbutton, the health and ca fe ty of the general public were not a f fec tec'].

o 6 l Reportable pursuant to T.S. 6.4.1.4.b. 1 0 / l 0 H l 7 8 9 D STE V C A'J3E CAUL _ COW \ A L\ E CODE CCDE SUBCODE COWONENT CODE SUSCODE SJBCODE 10191 1 C l O_j @ l Fl@ l a l@ l R I r l I. l A l Y l X lh l A j@ /-)_ 10

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4/ 41 l Ul 1 44 2l0lQ 47 CAUSE DESCmP TION AND COHRECTiVE ACTIONS i o ]We cause for the r,al func t ion was an open au'<iliary relay in the valve's Train A circui{t.

i i lThe de fec t ive relas uas replaced uith a no' or:e fron stock and the circuit ea t, tested l

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• PH Pa / " ' ' ' ' 5 ' "' I i as *JE OF PHEPAHE H '

Viretnia F.lec t ric and Powe r Conpany Attaenc.e- Page 1 of I

• o r t h :'.n na Powe r S ta t ion , l'n i t al Docket ":n . 50-333

'? e p o r t * :o . LFR S0-03/0 3L-0 Description of Event on J nu tr . 10, 19 80, d uring an a t tempt to op rate the "C" nain st.an isolation trip va'v. fro, the control .o .i, TV "S 101C trould not close hv the une of the Train A pushbutton.

Probable Consecuences of Event The bealth and sa fety of the general publ ic vere not af fected by thie event because the trip '.alve was satisfactorily operated by using the Train P, close pushbutton. 'Ihe re are no generic implications ..,ssocia ted with th is occu rron.ce. .

Cause of Occurrence The main steam trip valve did not close fron the Train A pushhutton because the auxiliary relay in tha valve's Train A control circuit was open and would not pick up.

Innediate Corrective Action T' ' had re l a y wa s replaced with a neu one from stock and the Train A centrol circuit was tested with satisfactory results.

Scheduled Correc t ive Action

• 0 scheduled corrective action is required.

Actions Ttken to Prevent Pecurrence

':o further actions are required. \931 14\