ML20009D567

LER 81-017/03L-0:on 810617,cracks Discovered on 4-inch & 1-inch Reactor Water Cleanup Heat Exchanger Piping,At Connection to Heat Exchanger.Caused by Poor fit-up & Welding Due to 3-inch Slag Line Near Root of Weld

ML20009D567
Person / Time
Site:	Monticello
Issue date:	07/16/1981
From:	Thurman P NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009D562	List: ML20009D561 ML20009D567
References
LER-81-017-03L, LER-81-17-3L, NUDOCS 8107240178
Download: ML20009D567 (1)

Text

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EVENT DESCRIPTION AND PROBABLE CONSEOUENCES h ITTTl I Durinc nomal operations. while removine insulation. cracks were discovered on i I o i a i I 4" and I" RWCU heat exchancer nininc. where thev connect to the heat exchanger. I i o u i i This constituted a decradation of a system desicned to carry radioactive material !

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41 lY 42 l@ lNl@ lPl1l6l0Jg 43 44 47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h l i t o i I Leak in 4" pipe is believed due to noor fit-un and weldine. 3-inch slac line l Ii t i i i found near root of weld, which was removed and weld repaired. Crack in 1" nine I iii2i 1 actually in 1" weld counline that attaches to the heat exchanger. Failure analvsisi I i I 3 I I beine nerfomed. OA will inenect related ninine durinc uncominc outace. I l i 141 I l

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121 8o8l LdE @lNA DESCRIPTION l ((((llllll lllj 30 68 69 30 g NAME Or pAE,.nEn Patrick S. Thurman pggy,; WM-M 8107240178 810716 - -

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