ML18347A814

LER 1980-037-00 for Palisades Nuclear Plant, Pipe Support Sway Struts Identified to Have the Potential of the Bushing Becoming Loose And/Or Disengaged from the Clamp End of the Sway Strut

ML18347A814
Person / Time
Site:	Palisades
Issue date:	10/10/1980
From:	Consumers Power Co
To:	Office of Nuclear Reactor Regulation
References
LER 1980-037-00
Download: ML18347A814 (2)

Text

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Attachment to LER 80-03'7/0l-X-O Consumers Power Company Palisades Plant Docket 50-255 - License DPR-20 Description Pipe support sway struts furnished by Corner and Lada, Inc have been found to contain some deficiencies. The specific deficiencies identified involve the potential of the bushd.ng becoming loose and/or disengaged from the clamp end of the sway strut. Under seismic conditions, disengagement of the clamp end from the bushing could overstress the piping system. This problem has been identified at a few nuclear plants already.

By letter dated October 8, 1980, Consumers Power Company was notified by Bechtel Engineering Corporation (Ann Arbor, Michigan) that the sway braces, furnished by Corner and Lada, Inc are potentially deficient.

1. GCl-H-142 LPSI Pump discharge area 2/w engineering safeguards rooms

2. DC2-H-6 SI Recirc to SIRW tank

3. HB-35-H-932 Aux feed pump suction area 6/aux feed pump room

4. GC-ll-H-862 Pressurized safety and relief valve piping to quench tank The sway struts identified were recently installed as part of plant modifications related to IE Bulletin No '79-14 activities and were obtained from Midland Plant stock. Other struts out of the Midland stock have been found to be defective.

Bechtel has also indicated that support devices provided by other manufacturers may have a similar defect.

Cause of Deviation There appears to be a generic deficiency in the pipe support sway struts furnished by Corner and Lada, Inc. The specific deficiencies identified involved the bushing becoming loose and/or disengaged from the clamp end of the sway strut.

Corrective Action Since this is a potential problem, and we have not experienced an actual failure to date, immediate action is not required. However, Bechtel Engineering Corpora-tion will proceed in resolving this issue as follows:

1. Review hanger drawings to identify any "potential" sway strut defect condition,

2. Establish criteria and schedule for inspection of these sway struts,

3. Provide a fix, if required.

PALISADES PLANT*

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION C7*771 LICENSEE EVENT REPORT CONTROL BLOCK:  !-I 1

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((I1J !Pipe support sway struts furnished by Corner and Lada, Inc have been

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(([TI 1under Palisades Plant Technical Specifications 6.9.2.a.(5).

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