05000250/LER-1979-002, Update to LER 79-002/03X-1 on 790226:during Refueling Shutdown,Crack Found in Weld on Drain Line in B Accumulator Discharge Piping.Caused by Stress Due to Line Vibration. Elbows & Welds Replaced

Update to LER 79-002/03X-1 on 790226:during Refueling Shutdown,Crack Found in Weld on Drain Line in B Accumulator Discharge Piping.Caused by Stress Due to Line Vibration. Elbows & Welds Replaced

ML17338B017
Person / Time
Site:	Turkey Point
Issue date:	08/03/1979
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17338B016	List: 05000250/LER-1979-002, Update to LER 79-002/03X-1 on 790226:during Refueling Shutdown,Crack Found in Weld on Drain Line in B Accumulator Discharge Piping.Caused by Stress Due to Line Vibration. Elbows & Welds Replaced
References
LER-79-002-03X, LER-79-2-3X, NUDOCS 7908200282
Download: ML17338B017 (3)

LER-1979-002, Update to LER 79-002/03X-1 on 790226:during Refueling Shutdown,Crack Found in Weld on Drain Line in B Accumulator Discharge Piping.Caused by Stress Due to Line Vibration. Elbows & Welds Replaced

Event date:
Report date:
2501979002R00 - NRC Website

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The elbow and welds were replaced and found acceptable following NDT examination.

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REPORTABLE OCCURRENCE 250-79-02, UPDATE 1 LICENSEE EVENT REPORT PAGE TWO Additional Cause Descri tion and Corrective Action The cracks in the 3B accumulator discharge piping drain line occurred in a 3/4 inch stainless steel elbow (type 316) and in the weld attaching it to a 3/4 inch stainless steel nipple (type 304).

The cracks were observed on the

upstream, socket end of the elbow and at its associated socket weld.

The defective elbow was cut out of the piping and a new type 316 stainless steel elbow was welded in place.

The new welds on the drain assembly were examined and found to be acceptable for use.

The cause of the cracks could not posi-tively be determined,

however, they were most probably caused by stress due to line vibration.

The drain assembly is pressurized to approximately 650 psig during normal operation.

The equivalent drain lines from the 3A and 3C accumulators were also examined and found to be in satisfactory condition.

A plant change/modification will be implerpented to provide additional support for vent and drain lines.

The implementation schedule will initiate the changes on Unit 4 during the Winter 1980 refueling outage and on Unit 3 during a Fall 1979 outage.

The plant change/modification on Unit 4 has been deferred from the Spring 1979 to the Winter 1980 refueling outage.

This deferral has resulted from (1) the non-availability of QC type material due to long lead time and (2) the non-availability of qualified manpower due to the labor intensive inspection being performed in accordance with USNRC I & E Bulletin 79-02, Pipe Support Base Plate Designs Using Concrete Expansion Anchor Bolts.

During the Spring 1979 refueling outage of Unit 4, the accumulator discharge piping vents and drains were examined using NDT methods.

The NDT examinations revealed no relevant indications or anomalies.

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