ML20038D015

LER 81-030/03L-0:on 811104,cracks Found Near Seating Surfaces of Reactor Water Cleanup Valves V12-29A & B,V12-19A & B & V12-73A & B.Cause Unknown.Valves Replaced.Epri Will Analyze V12-29A & 73A

ML20038D015
Person / Time
Site:	Vermont Yankee
Issue date:	12/04/1981
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20038D010	List: ML20038D009 ML20038D015
References
LER-81-030-03L, LER-81-30-3L, NUDOCS 8112140342
Download: ML20038D015 (1)

Text

. . m NRC FOLM 366 U.S. NUCLEAR REtULATC%Y COMMISSION (7 77)

LICENSEE EVENT REPORT LER 81-30/3L CONTROL SLOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo l i8l 9IV I TLICENSEE 7

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? 60 61 DOCKET NUMBER 68 69 EVENT OATE 75 REPORT DATE EVENT DESCRIPTION ANC PROBASLE CONSEQUENCES h lol2l l During replacement of RWCU piping, an inspection of valves V12-29A and B revealed I g o ,3 ; ; cracks on the internal surface of the valve bodies. Both cracks were-located I 10141 l approximately 2" from the seating surface. Other cracks were found near the seating l loisi 1 surfaces of RWCU valves V12-19A/B & 73A/B. There were no valve failures and there I t lo l6 l l were no adverse consequences to the public health and safety. There have been no l l o 17 l l previous similar occurrences. l I o is i 1 I i 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CCDE SUSCCCE COMPONENT CODE SU8 CODE SUSCODE loist 7 8 9 l C i n l@ lx l@ l 7 l@ IV I A li Iv 18 l x l@ l E l@ (_n_J 10 11 12 13 18 19 20 SEQU ENTI AL OCCURRENCE REPORT REVislON EVENTYEAR REPORT NO, CODE TYPE NO.

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l 3-] l The exac t cause f or the cracks is unknown. The valves were replaced as part of the I l i l i j l overall RWCU pipe replacement program. Valves V12-29A and 73A will be sent en I i,,3; } EPRI to determine the mode (s) of crack initiation. Results of the EPRI analysis i ii 93l l will be forwarded in an update to this RO. I f Ii I4 I I I

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% POWER OTHER STATUS ISCO RV DISCOVERY DESCRIPTION 11 15llHlh l0l0l0l@l NA l lCl@l Technician Observation l ACTIVITY CO TENT RELE ASED OF RELE ASE AVOUNT OF ACTIVITY LOCATION OF RELEASE 11 16 I d h l 7, l@l NA l l 45 NA 80 l

7 5 9 10 11 44 PERSONNEL EXPOSURES NUMBER TYPE C E SCRIPTION

• NA l l 1 l 7 l l 0 l 0 l 0 l@l Zl@l PERSONNEL INJURIES NUMeER DESCRIPTION NA 11 lall0l0l0l@l 7 8 9 11 12 80 l

LOSS OF OR DAV ACE TO F ACILITY NE OESCRIPTION NA l 11 191lZl@l

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• 8112140342 811204 "*C" C" "

,sSu E C PDR ADOCK 05000271 S

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7 a 3 'O NA PDR Il!IIIII!!III 68 69 80 i ywE OF PREPARER W rren P. Murphy PHONE:

(802) 257-7711 2 0