05000250/LER-1981-008-03, /03L-0:on 810416,crack Found in Weld on Drain Line from Charging Sys Downstream of Regenerative Heat Exchanger. Probably Caused by Stress Due to Line Vibration.Defective Area Cut Out,Nipple Shortened & Weld Replaced

/03L-0:on 810416,crack Found in Weld on Drain Line from Charging Sys Downstream of Regenerative Heat Exchanger. Probably Caused by Stress Due to Line Vibration.Defective Area Cut Out,Nipple Shortened & Weld Replaced

ML17340B213
Person / Time
Site:	Turkey Point
Issue date:	05/08/1981
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17340B211	List: 05000250/LER-1981-008, Forwards LER 81-008/03L-0 05000250/LER-1981-008-03, /03L-0:on 810416,crack Found in Weld on Drain Line from Charging Sys Downstream of Regenerative Heat Exchanger. Probably Caused by Stress Due to Line Vibration.Defective Area Cut Out,Nipple Shortened & Weld Replaced
References
LER-81-008-03L, LER-81-8-3L, NUDOCS 8105180337
Download: ML17340B213 (3)

LER-1981-008, /03L-0:on 810416,crack Found in Weld on Drain Line from Charging Sys Downstream of Regenerative Heat Exchanger. Probably Caused by Stress Due to Line Vibration.Defective Area Cut Out,Nipple Shortened & Weld Replaced

Event date:
Report date:
2501981008R03 - NRC Website

text

NRC FORM 288 (7 77)

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~ During heatup following refueling shutdown, a crack was found in a weld on

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This is reportable pursuant to TS 6.9.2.b.4.

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REPORTABLE OCCURRENCE 250 LICENSEE EVENT REPORT PAGE TWO Additional Cause Descri tion and Corrective Action:

The crack was located in a drain line from the charging system downstream of the regenerative heat exchanger.

The crack occurred in the weld area between the g inch pipe nipple associated with drain valve 120E and the reducing elbow tapped from the three-inch charging line.

The defective 'area was cut out, and the nipple was shortened and rewelded to the elbow socket.

The new weld was examined by liquid penetrant techniques and the assembly was pressure tested and found to be acceptable for use.

The cause of the crack could not positively be determined, however, it was most probably caused by stress due to line vibration.

The drain assembly is approximately at Reactor Coolant System pres-sure during normal operation.

A plant change/modification will be implemented to change the design of vent and drain assemblies.

The valves to be used in the new design are long lead procure-ment items (approximately 8 months.)

Following receipt of materials, the modi-fication will be implemented in the subsequently scheduled extended outage.