05000271/LER-1983-002-02, /02T-0:on 830108,discovered Leak in 2-inch Stainless Steel Schedule 160 Isolable Section of Reactor Drain Line.Cause Unknown.Leaking Elbow Replaced w/304L Type Stainless Steel Matl Per NUREG-0313 Requirements

/02T-0:on 830108,discovered Leak in 2-inch Stainless Steel Schedule 160 Isolable Section of Reactor Drain Line.Cause Unknown.Leaking Elbow Replaced w/304L Type Stainless Steel Matl Per NUREG-0313 Requirements

ML20028F374
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	01/21/1983
From:	Pelletier J VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028F371	List: 05000271/LER-1983-002, Forwards LER 83-002/02T-0 05000271/LER-1983-002-02, /02T-0:on 830108,discovered Leak in 2-inch Stainless Steel Schedule 160 Isolable Section of Reactor Drain Line.Cause Unknown.Leaking Elbow Replaced w/304L Type Stainless Steel Matl Per NUREG-0313 Requirements
References
LER-83-002-02T, LER-83-2-2T, NUDOCS 8302010297
Download: ML20028F374 (2)

LER-1983-002, /02T-0:on 830108,discovered Leak in 2-inch Stainless Steel Schedule 160 Isolable Section of Reactor Drain Line.Cause Unknown.Leaking Elbow Replaced w/304L Type Stainless Steel Matl Per NUREG-0313 Requirements

Event date:
Report date:
2711983002R02 - NRC Website

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8 63 61 DOCKET NUM8 ER 68 69 EVENT O ATE 74 76 REPORT DATE 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h Iol2l l While performing routine surveillance of the drywell during shutdown, indication i

[Oi3l l of a leak in a 2" SS schedule 160 isolable section of the reactor drain line was I

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,.. o VTVYS1 05000271 LER 83-2/1T CAUSE DESCRIPTION AND CORRECTIVE ACTION The exact cause of the pipe crack is unknown at present. The leaking elbow was replaced with a 304L type stainless steel material which meets the intent of NUREG 0313. Additional examinations of the vessel drain line were performed to verify the integrity of the pressure boundary. This included 4 welds PT'd and 6 welds VT'd and no-further leaks were discovered. An additional walk down of the nonisolable portion of the piping was. conducted and inspection was performed for evidence of leakage. No additional evidence of leakage was found.

i The failed elbow was sent to the Battelle Laboratories for analysis 'and failure mode determination. Upon receiving the Battelle Report, a cause description and summary of the corrective actions taken will be provided in a follow up report.

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