ML19305D809

LER 80-019/03L-0:on 800310,while Steam Flushing,Crack Found in Channel Head of Liquid Waste Evaporator Bottoms Heat Exchanger.Caused by Equipment Failure,Probably Due to Chloride Stress Corrosion.Sleeve Welded Over Channel Head

ML19305D809
Person / Time
Site:	Beaver Valley
Issue date:	04/08/1980
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19305D782	List: ML19305D781 ML19305D794 ML19305D797 ML19305D809
References
LER-80-019-03L, LER-80-19-3L, NUDOCS 8004150545
Download: ML19305D809 (2)

Text

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U. S. NUCLE AR REGULATORY COMMISS$2N f NRC FC8tM 366 (7 778 LICENSEE EVENT REPORT CONTROL BLoCx: l l l l l l

]@ iPLE ASE PR:NT OR TYPE ALL REQUIREO INFORMATION)

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1. 8 60 6' OOCnifNbVMER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lTTTI l Liquid Waste Evaporator lines had been plugged due to insuf ficient flushing after l pr77] l bottoms transfer. While steam flushing, a crack was found in a channel head of the i l o 14 I I Liquid Waste Evaporator bottoms heat exchanger. Because of the low pressure (less l

[TTTl I than 15 psic) during normal operation, it was felt that the fluid could be containedl ITTTl I within the Auxiliary Building even if a cross failure occurred and would be 1

["5'TTI I detected by sump level and radiation monitors. Since the radiation monitors would I g i ave hdiverted flow through the main filter banks, the (continued on attached) 80 I

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SOI:'E #'$E CO su8CiEE COuPONENT COOE s eEOE sENE O 9 lM lA l@ l El@ lD l@ l Hj Tl El Xl Cl Hl@ lG ]@ l Zl@ 18 19 20 F S 9 10 11 12 13 SEQUENTI AL CCCURAENCE REPORT REVISION EVENT YE AR REPORT NO. COOE TYPE NO.

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at l42N l@ lAl@ l Z l 4 I 4 l 4lh 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o l l The cause of the incident was equipment failure, most probably due to chloride 1 i I l stress corrosion since the unit handles water susceptable to chloride contamination I g land concentrates it. Temporary corrective action was to weld a sleeve over the I t 3 l channel head of the heat exchanger since additional cracks appeared when weld _

l g l repairs were attempted. Engineering is investientine (continued on attached) 90 l

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Attachment To LER 80-019/03L Beaver Valley Power Station .

Duquesne Light Company Docket No. 50-334 Event Description And Probable Consequences (continued) offsite implications would have been negligible.

Cause Description And Corrective Actions (continued) materials that will be more compatible with the process fluid to preclude the more deleterious effect of corrosion. There have been no previous failures of this type.

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