ML20023B474

LER 83-011/03L-0:on 830325,during Visual Insp,Shock Suppressor MS-6 on Main Steam a Piping Found W/No Visible Fluid in Sight Glass & Failed to Lock Up.Caused by Damaged Lenztee.Snubber Cleaned & Rebuilt

ML20023B474
Person / Time
Site:	Vermont Yankee
Issue date:	04/25/1983
From:	Pelletier J VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20023B468	List: ML20023B466 ML20023B474
References
LER-83-011-03L, LER-83-11-3L, NUDOCS 8305050108
Download: ML20023B474 (1)

Text

1 m- mx NRC FORM 366 U.S. NUCLEAR REGULATOQY COMMISSION (7 77)

LICENSEE EVENT REPORT LER 83-11/3L CONTROL BLOCK: l l l l l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l o l 819l lV l.T 7

l V l Y l S14l 1 ISl@l 0 l 0 l - LICENSE LICENSEE CODE l 0 l 0NUMBER l0]0]0]-l0 25 l 0 26 l@l4 l1l1l1l1l@l LICENSE TYPE JO l

$7 CAT 68 l@

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? 8 S$RC60l L l@l 61 0 ] 5DOCKET l 0 lNUMBER 0 l 0121768l 1 69@l 01312 EVENT DATEl 518131@l014 74 75 l2151813 REPORT DATE 80l@

EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 10 li j l During a visual inspection, shock suppressor MS-6 on Main Steam "A" piping was foundl i O l a i l with no visable fluid in its sight glass and subsequently f ailed to lock-up within l l o 14 i i procedural tolerance when functionally tested in the as-found condition. This is I loisl l contrary to Tech. Spec. 3.6.1.1. Since MS-6 was returned to service prior to start-l 10 is l 1 up and due to the lack of a seismic event recuirine it to function. no consecuences l l0l7)l adverse to public health 6 safety resulted. Similar occurrences were reported as l l O la l l LER 80-08, 79-26, 79-9, 77-24. I 80 7 8 9

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• $'E "^"o'E CO S BCODE COMPONENT CODE SUSC DE S E 10l9l l H l B lh Wh W h l S l U l P l O l R l T lh l D lh (Z_j h 18 19 20 7 8 9 10 11 12 13 SEOUENTIAL OCCURRENCE REPORT REVISION

,_ EVENT YEAR REPORT NO. CODE TYPE NO.

h ,"LE R Ro l j,Pgj 813l l-l IO l111 l l/l 10 l 3 l lL l l-l l 0l

_ 21 22 23 24 26 27 28 29 30 31 32 K N A T ON ON PL NT ET HOURS 22 SB IT FO is. SUPPLIE MAN FAC URER l33D l@lZ 34 l@ W@

36 l36Z l@ l010l010l 37 40 W@ lYl@

41 42 l43A l@ lG l2l517l@

44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h Iil0ll MS-6 was found to have a damaged lenztee allowing fluid to leak from its reservoir. I IiliIl Snubber was then disassembled, cleaned and rebuilt with new parts and refilled. I i1 i7i l Snubber was then functionally tested and returned to service. MS-6 is a 21" 5 Grinnell g l Figure 200 Shock Suppressor. l l

I i 14 I I 80 7 8 9 ST S 4. POWER OTHER STATUS 015 O RY DISCOVERY DESCRIPTION

! l1 I s l [H_lh l 0l Ol 0lhl NA l lBl@l Maintenance Inspection l CTtytTY CONTENT AYOUNT OF ACTIVITY LOCATION OF RELE ASE

[1j_6_jRELEASE

[.Z_} @D OF RELE ASEl_Zj@l NA  ! l NA l 7 8 9 to 11 44 45 80 PERSONNEL FXPOSURES NUVBE R DESCRIPTION l i 171 10 10 l 0 lhlTYPEZlhl NA l PERSONNE L INJURIE3 NUMBER DESCRIPTION NA W l 809 l 0 l 0 l@] l 8o

! 7 11 12 8305050108 830425

'vD*E "" *78PTESC ON' 'P^'" h NA PDR ADDCK 05000271 S PDR l l

[TTil8 9l Zl@l 7 10 80 ISSUE DESCRIPTION t la101 7 8 9 hl to NA l 68 69 lll1lllfIl llli 80 ;

NAME OF PREPARER James P. Pelletier PHONE: (802) 257-7711 {

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