ML17275A447

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Forwards Revised Response to Violations Noted in IE Investigation Rept 50-397/79-10.Transient Analysis Indicates Matl Adjacent to Weld & Under Heating Blanket Were Not Excessively Overheated
ML17275A447
Person / Time
Site: Columbia Energy Northwest icon.png
Issue date: 06/11/1980
From: Renberger D
WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To: Spencer G
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML17275A445 List:
References
GO2-80-120, NUDOCS 8007230623
Download: ML17275A447 (4)


Text

Washington Public Power Supply System A JOINT OPERATING AGENCY P. O. ODX 988 3000 GTD, WASHINCTCN WAY RICHLAND. WASHINCTDN 993 3 iP 509) 375 5000 June 11, 1980 G02-80-120 G. S. Spencer, Chief Reactor Construction 8 Engineering Support Branch Nuclear Regulatory Commission e Region V Suite 202, Walnut Creek Plaza 1990 N. California Blvd.

Walnut Creek, California 94596

Subject:

MPPSS NUCLEAR PROJECT NO. 2 DOCKET NO. 50-397, CPPR-93 NRC INSPECTION REPORT NO. 50-397/79-10

Reference:

Letter G02-80-91, DL Renberger to GS Spencer, dated 4-9-80

Dear Hr. Spencer:

Forwarded herewith is the Supply System's revised response to the Q>> Nuclear Regulatory Commission Report No. 50-397/79-10, Notice of Violation, Item A, as committed per the referenced letter.

If you have any questions or desire further information, please advise.

Very truly yours, D. L. RENBERGER Assistant Director Technology DLR/RTJ/1 n cc: JJ Byrnes - B8R, NY JM Blas - BSR, NY JR Lewis - BPA, Richland V Stello - Director, NRC, Washington, D.C.

JJ Verderber - B8R, NY LIS - NUS Corporation SOOV23O&gQ'.

0 APPENDIX A Washington Public Power Supply System P. 0. Box 968 Richland, Washington 99352 Docket Number 50-397 Construction Permit Number CPPR-93 Notice of Violation Based on the results of NRC inspections conducted between May 16 and September 14, 1979, it appears that certain of your activities are not conducted in full compli-ance with conditions of your NRC facility license No. CPPR-93 as indicated below.

A. 10 CFR 50, Appendix B, Criterion IX, states in part that "...measures shall be established to assure that special processes, including...heat treating...are controlled and accomplished by...using qualified procedures...".

Paragraph D.2.5.9 of the WPPSS guality Assurance Program documented in the PSAR states in part that "...measures shall be established...to assure that special processes, including...heat treating...are accomplished...using qualified...pro-cedures...".

Contrary to the above, on May 31, 1979, it was found that the piping post weld heat treating procedure No. PWHT-1, Revision 4 (entitled "Post Weld Heat Treat'<

Procedure No. 1), was implemented using a unique method of heat application without the benefit of qualification. The method employed electric resistance heater blankets placed along each side of the weld (approximately 1 1/2 inches from the weld center line) rather than directly over the weld. This procedure had been used to heat treat safety-related pipe welds including welds 6, 7 and 8 of Burns 5 Roe isometric drawing No. RFW-419-4.

This is an infraction.

Action to Correct Deficienc A one-dimensional transient analysis was performed to determine the maximum tempera-ture the feedwater piping reached, utilizing electrical resistance heater blankets specified in Post Weld Heat Treating Procedure No. PWHT-l, Revision 4.

Because the transient analysis results disclgsed that the maximum temperature obtained anywhere on the pipe was below 1330 F, we concluded that the material adjacent to the weld, and under the heating blanket, were not excessively overheated and that post weld heat treatment performed did adequately stress relieve the welds as desired. It is further noted that the analysis corroborates the findings of Report No. IT-119, dated September 28, 1979, titled "Results of Hardness Testing and Metallurgical Examination on Feedwater Pipe Welds at Washington Nuclear Project No. 2".

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