ML19339A275

LER 80-03l/03L-0:on 801001,while Refueling,Shock Suppressor MS-24 on Main Steam C Piping Found No Visible Fluid in Sight Glass.Caused by Fluid Leakage in One Cylinder Inlet Fitting.Seals in Cylinder & Valve Replaced

ML19339A275
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	10/31/1980
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19339A273	List: ML19339A272 ML19339A275
References
LER-80-031-03L, LER-80-31-3L, NUDOCS 8011030509
Download: ML19339A275 (1)

Text

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,- s , , LICENSEE EVENT REPORT LER 80-31/3L 1 CONTROL BLOCx: l l l l l l lPLEASE PRINT OR TYPE ALL REQUIRED INFOT.MATION)

RIV 7 8 9 l T lLICENSEE V l YCODEl S l 1 l@l 0 l0 l- 10 14 15 l0 l0 l010 l- l0 l0 l@l4LICENSE LICENSE NUMBER 25 26 l1l1Ill1l@l TYPE JQ l

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CON'T lol I ERc I t l@l 0 l 5 l 010 l 0121711 @l1 1010 l1 l 8 10 l@ll 10 13 11 18_l.Q_j@ 74 80 i 8 60 61 DOCKET NUMBER 68 69 EVENT DATE 75 REPORT DATE EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h M lDurine a visual insnection while refueline. shock suooressor MS-24 on Main Steam "C" l 10131 l eiping was found with no visible fluid in its sieht class and subseOuently failed to l IO I4 l l lock uo within orocedural tolerances when functionally tested in the as-found con- 1 IOI5l ldition. Stace MS-24 was returned to service prior to startup and due to the lack of a l 1O16I lseismic event recuirine it to function. no consecuences. adverse to oublic health and l O I7I , safety resulted. A similar orevious occurrence was reported as RO 79-26. I 10181l l 7 8 9 80 E CODE $ SC E COMPONENT CODE SU8 OO'E SU E 10191 I Z l Z l@ [J_j@ hj@ Is lu lp lo la IT l@ W@ W @

9 18 19 20 7 8 to 11 12 13 SEQUENTIAL OCCURRENCE REPORT R EVISION GR,Ro EVENT YE AR REPORT NO. CODE TYPE NO.

@ suuQ l 8 l 01 aEP l-l l Ol 3l 11 l/l l0131 lL l l-l l0l 21 22 23 24 26 27 28 29 30 31 32 K N AC O ON PL NT MET HOURS S8 iT POR 8. SUP Li MANUFAC RER lDl@lZl@ l3hZ l@ lZ l@ l 0l 0l 01 0l lNl@ l42Y l@ l43 Al@ lG l2 l5 l547l@

33 34 36 31 40 di 44 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS Ii10llMS-24 failed due to fluid leakaee at one evlinder inlet fierine. %nin in ev11,dar l L'_J '_J land valve were replaced, the unit was functionally tested and reinstalled prior to l ITTTI I startup (T.S. 3.6.I.4) . Since MS-24 failed to pass the visual examination and repre- I g l sents the second such failure in 6 months, the inspection interval will be decreased I ii i4: lfrom 12 months ! 25% to 6 months 25%. MS-24 is a Grinnell Figure 200 shock suppres.1 7 8 9 80

$A S  % POWER OTHER STATUS DIS O RY DISCOVERY DESCRIPTION I1 15 l l H l@ l 0l Ol 0l@l NA l (,},_j@lVisualInspection-Routine l A TlVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE l,,,i ] 6_j [_Z,,,,j @ d@l NA l l NA l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION l t l 7 l l 0 l 0 l 0 l@l Z lhl' NA l

' PERSONNEt mu'4ES NUMBER DESCRIPTION @

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1010101@l 9 11 12 NA 80 l

LOSS CF OR OAMAGE TO FACILITY TYPE DESCRIPTION Li_L9J LZ_J@l NA l

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• • "7CRiPfiON Oe @ [df NA l llll1IlllIIll1 7 8 9 10 68 69 80 5 NAME OF PREPARER PHONE: (802) 257-7711 {