ML20028D542

LER 83-002/01P-0:on 830108,indication of Leak in 2-inch Stainless Steel Schedule 160 Isolable Section of Reactor Drain Line Found.Caused by Pipe Crack.Cause of Pipe Crack Unknown.Elbow Replaced w/304L Type Stainless Steel Matl

ML20028D542
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	01/10/1983
From:	Pelletier J VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028D538	List: ML20028D537 ML20028D542
References
LER-83-002-01P, LER-83-2-1P, NUDOCS 8301190240
Download: ML20028D542 (2)

Text

." ## ' . LICENSEE EVENT REPORT LER 83-2/1P (PLEASE PRINT CR TYPE ALL CEQUCED INPCMATitN)

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74 75 80 7 8 60 61 NUMBER DATE REPORT DATE EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h I o 12 l lWhile performing routine surveillance of the drywell during shutdown, indication l I o 13 l lof a leak in a 2" SS schedule 160 isolable section of the reactor drain line was l l o 14 l l discovered. This leak is contrary to Tech. Spec. 3.6.E. There were no adverse I l o i s l- l consequences to the public health and safety. l l

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40 41 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 l i ) o l lThe exact cause of the pipe crack is unknown at present. A full report will be I g lmade when the information is available. The leaking elbow was replaced with a I

.i,,2i l304L type stainless steel material which meets the intent of NUREG 0313. Additional l

i l3l l examinations of the vessel drain line were perfo-med to verify the integrity of I l

liI4l lthe pressure boundarv. See Attached.

80 7 8 9 A S  % POWER L 4ER STATUS DIS OV RY DISCOVERY DESCRIPTION I1 l 5 l lG lh l 0 l 0 l 0 l@l NA l lBl@l Routine Surveillance l l ACTIVITY CO TENT RELEASED OF RELE ASE AMOUNT OF ACTivlTY LOCATION OF RELEASE l

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7 8 7 to 68 69 80 3 8301190240 830110 I. P. Pelletier PHONE: (802) 257-7711 2 PDR ADOCK 05000271 S PDR

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VTVYS1 05000271 LER 83-2/IP Cause Description and Corrective Actions The exact cause of the pipe crack is unknown at present. A full report will be made when the information is available. 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 an inspection was performed, for evidence of leakage. Lo additional evidence of leakage was found.

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