05000271/LER-1981-030, Updated LER 81-030/03L-1:cracks Found on Internal Surface of Valve Bodies & Seating Surfaces of Reactor Water Cleanup Valves Attributed to Surface Shrinking of Casting & Intergranular Stress Corrosion Cracking,Respectively

Updated LER 81-030/03L-1:cracks Found on Internal Surface of Valve Bodies & Seating Surfaces of Reactor Water Cleanup Valves Attributed to Surface Shrinking of Casting & Intergranular Stress Corrosion Cracking,Respectively

ML20054L852
Person / Time
Site:	Vermont Yankee
Issue date:	07/01/1982
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20054L851	List: 05000271/LER-1981-030, Updated LER 81-030/03L-1:cracks Found on Internal Surface of Valve Bodies & Seating Surfaces of Reactor Water Cleanup Valves Attributed to Surface Shrinking of Casting & Intergranular Stress Corrosion Cracking,Respectively
References
LER-81-030-03L, LER-81-30-3L, NUDOCS 8207090008
Download: ML20054L852 (1)

LER-2081-030, Updated LER 81-030/03L-1:cracks Found on Internal Surface of Valve Bodies & Seating Surfaces of Reactor Water Cleanup Valves Attributed to Surface Shrinking of Casting & Intergranular Stress Corrosion Cracking,Respectively

Event date:
Report date:
2712081030R00 - NRC Website

text

Y U. S. NUCLEAR REGULATORY COMMISSION UPDATE REPORT (Previous Report - 12/4/81)

NRC ,, (ORM %6 LER 81-30/3h Rev. 1 LICENSEE EVENT REPORT

"' CONTROL BLOCK: l l l l  ! l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l0 l18 l9l Vi Tl Vl Yl Sl ll@l 010 14 15 l- I O l 0LICENSE l 0 lNUMSER 0 l 0 l- l 0 l 0 l@l 25 4 l 1LICENSE 26 l 1 l 1TYPE l l !JOl@l57 CAT $8 l@

F LICENSEE CODE CON'T lOlil "*" "y l L@l015 l010 l0 l 2 l 711 68@l 691 i l 10 l 4 l 811 @l017 REPORT 3 74 75 l0 l 118 DATE l 280l@

7 8 60 61 DOCK ET NUMBER EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o I 2 I I During replacement of RWCU piping, an inspection of valves V12-29A and B revealed 1

,oi3, l cracks on the internal surface of the valve bodies. Both cracks were located l

o ;4; l approximately 2" from the seating surface. Other cracks were found in the seating I i

l o I s l I surfaces of RWCU valves V12-19A/B & 73A/B. There were no valve failures and there j o le l l were no adverse consequences to the public health and safety. There have been no l l 0 l 7 l l previous similar occurrences. I I

l uis i I SYSTEV CAUSE CAUSE COMP. VALVE CODE CODE SURCODE COMPONENT CODE SUBCODE SU8 CODE lO191 7 8 9 i Cl cl@ U@ LzJ@ l v i Al ti vi el xl@ is_J@ b_l @

to 11 12 13 18 19 20 SEQUENTI AL OCCUR R E NCE REPORT REVISION

,EVENTYEAR R EPORT NO. CODE TYPE NO.

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@ agg 18 l1 l [_l l 0 l 3 l 01 l-l l0 13 I ltl l-l l1 1 23 24 26 27 28 29 30 31 32

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42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l o l l Valves V12-29A and 73A were sent to Battelle Labs to deternine the c rnckin c mochnni emi.

i ;, ; l Cracks found in the seating area of the valves were caused by IGSCC. Cracks found l

,,,,, lIn the valve body were attributed to surface shrinkage of the casting. No further l i , ,3, l corrective action is required. ]

l li l41 I 80 7 8 9 TA $  % POWER OTHER STATUS 035 O RY DISCOVERY DESCRIPTION l

l1 I S I l II lh l0 l 0 l 0 l@l NA l W @l Technician Observation A TiVITY CO TENT RELE ASED OF RELE ASE AMOUNT OF ACTivtTY LOCATION OF RELEASE NA l l NA l li I s 8l 9Lz_] @ toIz l@l

? 11 44 45 80 PERSONNEL FtPOSURES NUYBE R TYPE DESCRIPTION l i l 71 101010_j@l z l@l NA l

' " ' ,ERSONd',N;URiES

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~uMeER DESCRiPriON@

W l0l0l0l@l 7 8 9 11 12 NA 80 l

LOSS OF OR D AMAGE TO FACILITY TYPE DESCRIPTION NA l 1 Til8 l9 z l@l 7 to 80 ISSUE DESCRIPTION NA lllllllllllllf I:lolLZ_f81 7 8 9 10 l

68 69 80 5 8207090008 820701 Murphy PHONE.~ (802) 257-7711 E PDR ADOCK 05000271 S PDR