ML19340C497

LER 80-037/01T-1:on 801027,cracks Discovered in 4-inch Reactor Water Cleanup Suction Line.Cause Undetermined. Samples of Cracked Pipes Sent to Lab for Analysis

ML19340C497
Person / Time
Site:	Vermont Yankee
Issue date:	11/08/1980
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19340C496	List: ML19340C495 ML19340C497
References
LER-80-037-01T, LER-80-37-1T, NUDOCS 8011170500
Download: ML19340C497 (2)

Text

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NRc FORM ass ^ u's.~ NUCLEAR REGULATORY COMMISSION (7 771 q -

LICENSEE EVENT REPORT- LER 80-37/1T

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DOCKET NUM8 E R EVENT OESCRIPTION ANO PROBA8LE CONSEQUENCES h 10121 lDuring performance of Inservice Inspection while shut down for refueline. crnek=  !

Io lal lwere discovered in the 4" Reactor Water Cleanuo Suction Line. Of 13 velds in e:nocrod l lo141.-15 had cracks in the weld heat-affected zone. One of these was a throusth-wall crack- l 1

Ioisl lin a non-isolable section of the line. Another through-wall crack was foune on the I l o is I Ithroat of the 20" X 4" sweenolet which connects the clonnun Ructinn T.i no en tha J l 0 i 7 I l20" RHR Suction Line . also non-isolable. I 10181I l 7 8 9 80

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- N'AME OF PREPARER Warren P. Murchv psong; @U WWH {

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• VTVYS1 05000271 LER 80-37/lT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS A decision has been made to replace the Reactor Water Cleanup Suction Line with conforming material per NUREG 0313, Rev.1 from the RIIR branch con-nection to the cutboard isolation valve. Existing materials are ASTM-A-312, Type 304 pipe, ASTM-A-182, Type 304 sweepolet, and ASTM-A-403, Type 304 elbows.

Samples of the cracked piping will be sent to a laboratory for analysis of the failure mode, and the results of this analysis will be provided in a subsequent report.

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