ML20039G098

LER 81-065/01T-0:on 811209,shutdown Commenced to Investigate a Isolation Condenser Isolation Valve V-14-30 811203 & 04 Failure to Operate Properly.Caused by Excessive Stress on Valve Backseat & Damage to Stem Nut

ML20039G098
Person / Time
Site:	Oyster Creek
Issue date:	12/23/1981
From:	Frederick Sullivan JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20039G095	List: ML20039G094 ML20039G098
References
LER-81-065-01T, LER-81-65-1T, NUDOCS 8201150282
Download: ML20039G098 (1)

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[TTT} j On Decmber 3, 1981, the 'A' Isolation Condenser Isolation Valve V-14-30 l o ,3 j. ; failed to properly operate. The valve was successfully cycled but the g

o i4 i i next' day failed again tc operate. The valve operator stcrn nut was found l o 1s1 ; tb Le damaged. An examination of V-14-32's stcm nut proved to show the g

c r c. t i same results. Failure of these valves to close would result in degrada- ,

o1;[ tion of the reactor coolant pressure boundar.y. g

~0}Oj l g o' 40 GYSTEM CAusE CAusE COMP. VALVE

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Ju l l! 2 l5 ie i 27 40 gg el l2N rg; l3x lg 4 4 l Al 3 l 9 l14y [g 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 TF1l The station's method for backseating these valves created excessive I il 1I stress on the valve backseat. Failure of the backseat allowed the non- I ri i 21 I threaded portion of the stcm to enter the stanut and created binding ,

l3l L problems. Suspected valves will be inspected and repaired as needed.  ;

4 i l Applicable station operating procedures will be revised.

G 9 00 57$  % POWER OTHER STATUS 015 Q Y DISCOVERY i5 l Wh l 0 l 9 l6 g}l NA l lB lgl Surveillance Test OCSCR6PTION h l ACTivlTY CO TENT REi.casto or RELEASE LOCATION op RELEAss h l6 l h ' h AuCUNTor NA ACriv Tv l hl NA l

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c i 6 9 11 12 . 90 LOSS OF OR OAMACE TC H . /,y i TYFE QEsCRIPTION .

y l Dl@l Damaged stcm nuts, stcms and discs.

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.:guCo oEsCRIPTION , 9201150282 PDR ADOOK 0500021 811223 NRC USE ONLY b W h! a v IO

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