ML20027E844

Forwards Test Results Re Preloading Relaxation Due to Thermal & Pressure Cycling of Pipe Clamps,Per NRC 820625 Ltr

ML20027E844
Person / Time
Site:	Satsop
Issue date:	11/11/1982
From:	Bouchey G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Knighton G Office of Nuclear Reactor Regulation
References
GO3-82-1135, NUDOCS 8211160248
Download: ML20027E844 (2)

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Washington Public Power Supply System P.O. Box 968 3000GeorgeWashingtonWay Richland, Washington 99352 (509)372-5000 Docket No.50-50S November 11, 1982 G03-82-ll35 Mr. G. W. Knighton Chief Licensing Branch No. 3 U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

NUCLEAR PROJECT 3 RESPONSES TO NRC QUESTIONS ON PIPE CLAMPS

References:

a) Letter F. J. Miraglia to R. L.

Ferguson, dated June 25, 1982 b) Letter #G03-82-760, G. D. Bouchey to F. J. Miraglia, dated July 30, 1982 same subject The testing program described in Reference b) in response _to Reference a),

question #8, is now complete.

A description of the test results is provided as an attachment to this letter.

Should you have any questions or desire further information, the Supply System point of contact in this matter is Mr. K. W. Cook, Licensing Project Manager (206 482-4428 ext. 5436).

Sincerely, NM G.D.Bouchey,EEager(370)

Nuclear Safety and Licensing GDB/hd Attachment cc: J. A. Adams, NESCO Ebasco, Elma D. J. Chin, NY0 @ {p D. Smithpeter, BPA WNP-3 Files, Richland 8211160248 821111 PDR ADOCK 05000508 A PDR

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+, 'o ATTACHMENT 1 QUESTION #8 The applicant should address the possibility of preloading relaxation due to thermal and pressure cycling of the pipe.

ANSWER #8 In response to this question, the preload relaxation due to thermal and pressure cycling was addressed in the following manner:

1. A size 2A Figure 215 Stiff Clamp was attached to an 8 inch schedule 160 stainless steel pipe spool at a torque of 40 foot pounds which is 15% in excess of the required installation torque (35 foot pounds).

This was used to conservatively simulate the piping pressure.

2. The pipe spool and clamp were heated in an oven to a temperature of 6500 Fahrenheit.

3. They were held at this temperature for an hour and then air cooled to room temperature a total of ten cycles at which time the torque was check ed.

The results of the test were favorable in that there was no torque relaxation. Therefore, since no torque loss was evident the recommended loads and stiffnesses are still applicable.

The ITT Grinnell Test Report can be made available upon request.

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