ML20004E954

LER 81-012/03L-0:on 810512,shock Suppressor on Main Steam D Piping Found W/No Visible Fluid in Site Glass Resulting in Failure to Lock Up within Procedural Tolerance When Tested in as-found Condition.Cause Not Determined

ML20004E954
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	06/10/1981
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20004E949	List: ML20004E948 ML20004E954
References
LER-81-012-03L, LER-81-12-3L, NUDOCS 8106160232
Download: ML20004E954 (1)

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'4MC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION I 7 77) h 7 LICENSEE EVENT REPORT LER 81-12/3L ONTROL SLOCK: l l i

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l 10 t 3i l9 IV l UCENSEE 7

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6 1 l 1 TYPEl ll 1l@l JC J, l 57 CAT 5d g

COP 4'T l 10l1I "'[RC O E lL @l0 l 5 DOCKET l0 l0NUMBER l0 l 2 l 7 l1 @l 0 lEVENT 5 l 1] 2] 8 l 74l @l0 l 6REPORT l1l 0 l 8 l 1l@ f

? 8 60 61 68 69 OATE 75 DATE 80 EVENT DESCRIPTION AND PROB A8LE CONSEQUENCES h I o 121 l During a visual inspection, shock suppressor MS-32 on Main Steam "D" piping was l l O l a l l found with no visible fluid in its sight glass and subsequently failed to lock-up l l 014 I I within procedural tolerance when functionally tested in the as-found condition. 1 Ioisl I Since MS-32 was returned to service prior to startup cnd due to the lack of a seis- l 10is1Imic ovnne roaufrine it to function. no consecuences, adverse to nublic health and l I O i i l i saf e ty resulted. Previous occurrences were reported as LER 80-08 and LER 77-24. l lOldl l  !

7 8 9 SO SYSTEM CAUSE CAUSE COMP. VALV E CODE CODE SU8 CODE COMPONENT CODE SUSCODE SUSCODE 10191 7 8 12 l Z lh [E_jh l B lh lS lU lP l0 lR lT lh lD lh W h 9 10 11 12 13 , 18 19 20 y

SEQUENTIAL OCCURRENCE REPORT REVISION LER RO EVENT YEAR REPORT NO. COOE TYPE NO.

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33 34 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h k I i 101 l Functional testing did not reveal the cause of leakage. Upon disassembly, no ob- I W l vious seal deeradation was observed though some evidence of snubber fluid leakane I iii2i 1 appeared in the rod seal area during the visual inspection. Snubber MS-32 was I l'I3II completely rebuilt and functionally tested prior to rainstallation. MS-32 is a l Ii I A 1 l 2 1/2" Grinnel Figure 200 Shock Suppressor. I 7 8 3 80 STA  % POWER OTHER STATUS 015 O RY OtSCOVERY OESCRIPTION liisl J @ l0l0l0l@l NA l l B l@l Maintenance Inspection l

'$7tv1TY A CO$ TENT RELEASE 0 CP RELEASE AMOUNT OP ACTIVITY LOCATION OF mELEASE l1 l6l @ @l NA l l NA l 7 8 9 to 13 44 45 80 PERSONNEL e=POSURES NUMBER DESCRIPTION l i l 7 l l Ol 0l OjhlTYPEZlhl NA l

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3 3 to 68 69 30 i NAME GF PREDAP5R W rren P. Murphy PHONE: (802) 257-7711 2 8106160.230-