ML20247P723

Requests Addl Info Re 890320 Request for Exemption from 10CFR50,App J Re Interpretation to Leave Leak Chases Plugged During Integrated Leak Rate Test

ML20247P723
Person / Time
Site:	Callaway
Issue date:	07/31/1989
From:	Alexion T Office of Nuclear Reactor Regulation
To:	Schnell D UNION ELECTRIC CO.
References
TAC-72750, NUDOCS 8908040286
Download: ML20247P723 (4)

Text

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, , y[.  %, UNITED STATES 3 g fiUCLEAR REGULATORY COMMISSION

,  ; ry WASHINGTON, D. C. 20555 July 31, 1989

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Docket No. 50-483 Mr. Donald F. Schnell Senior Vice President - Nuclear Union Electric Company P. O. Box 149 St. Louis, Missouri 63166

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION REGARDING APPENDIX J EXEMPTION (LEAK CHASES) (TAC NO. 72750)

The staff is continuing its review of your March 20, 1989 request for an exemption to 10 CFR Part 50, Appendix J, regarding your interpretation to leave leak chases plugged during an integrated leak rate test (ILRT). The staff requests additional information identified in the enclosure to continue its review.

Please respond within 60 days from the date of this letter. This request affects fewer than 10 respondents; therefore, OMB clearance is not required under Pub. L.96-511.

Sincerely, f)MsF AtU Thomas W. Alexion, Projec Manager Project Directorate III-3 Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc: See next page

Enclosure:

As stated I

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.- Mr. D. F. Schnell- Callaway Plant I Union Electric Company Unit No. I cc:

Dr. J. 0.- Cermack Mr. Bart D. Withers I CFA Inc. President and Chief 4 Professional Dr., Suite 110 Executive Officer Gaithersburg, MD' 20879 Wolf Creek Nuclear Operating Corporation Gerald Charnoff, Esq. P. O. Box 411 Thomas A. Baxter, Esq. Burlington, Kansas 66839 Shaw, Pittman, Potts & Trowbridge 2300 N Street, N. W. Mr. Dan I. Bolef, President Washington, D. C. 20037 Kay Drey, Representative Board of Directors Coalition Mr. T. P. Sharkey for the Environment Supervising Engineer, St. Louis Region Site Licensing 6267 Delmar Boulevard Union Electric Company University City, Missouri 63130 ,

Post Office Box 620 fulton, Missouri 65251 U. S. Nuclear Regulatory Commission Resident Inspectors Office RRi1 Steedman, Missouri 65077 Mr. Alan C. Passwater, Manager Licensing and Fuels Union Electric Company

' Post Office Box 149 St. Louis, Missouri 63166 Manager - Electric Department Missouri Public Service Connission 4 301 W. High Post Office Box 360 Jefferson City, Missouri 65102 Regional Administrator U. S. NRC, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Mr. Ronald A. Kucera, Deputy Director Department of Natural Resources P. O. Box 176 Jefferson City, Missouri 65102 I

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, REQUEST FOR ADDITIONAL INFORMATION REGARDING APPENDIXJEXEMPTION(LEAKCHASES) 4

1. Provide supporting analyses and stress calculations for at least one typical leak chase channel to show that the containment liner leak chase channel system meets the following requirements:

a. The weld material strength and quality of weld attaching the channel to the liner plate should be equal to or better than that of the original liner joints and should meet the applicable requirements of either ASME Boiler and Pressure Vessel Code,Section III, Division 2, Subsections CC-2000, 3000 and 4000 (Code of Concrete Reactor Vessels and Containments, 1983), or whatever comparable code that was used in design and construction.

b. Since the leak chase channels now become part of the containment wall and are therefore considered a structural element, the strength of the channel box and its welds should be able to resist all load combinations involving the tested loads and the loads of a postulated accident, including seismic loads. The design of the leak chase channel should meet the applicable requirements of steel containments;

.i.e., either ASME Boiler and Pressure Vessel Code,Section III, Division 1, Subsections NE-2000, 3000 and 4000 for Class MC Components (1983)andAmericanInstituteofSteelConstructionSpecificationfor the Design, Fabrication and Erection of Structural Steel for Buildings (1978), or whatever conparable code that was used in design and construction.

2. Complete documentation of installation records, including leak test procedures and results of the liner seam welds and the welds attaching the channel to the liner, should be available onsite. Please summarize and provide examples of available records. If no records or only partial records are available, as suggested in your March 20, 1989 letter, provide whatever additional information/ assurance is available regarding procedures, materials, welds, inspection records, etc.

3.- The staff needs a commitment that you will perform a visual inspection of the accessible interior and exterior surfaces of the containment structure and components prior to any Type A test, including a visual inspection of accessible channel plugs, as required by 10 CFR Part 50, Appendix J.

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July,31, 1989 c n .. ..

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Docket No. 50-483~

Nr. Donald F. Schnell Senior Vice President - Nuclear Union Electric Company 7 .P. O. Box 149.

-.St. Louis, Missouri 63166

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SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION REGARDING APPENDIX J EXEMPTION (LEAK. CHASES)(TACNO.72750)

- The. staff is' continuing its review of your March 20, 1989 request for en exemption"to 10 CFR Part 50, Appendix J, regarding your interpretation'to leave leak chases plugged during an integrated leak rate test (ILRT). The .-

staff requests additional information identified in the enclosure to continue its review.

- Please respond within'60 days from the date of this letter. .This request affects fewer than 10 respondents; therefore, OMB clearance.is not required' '

under-Pub. L.96-511.

Sincerely, . 4 original signed by:

Thomas W. Alexion, Project Manager Project Directorate III Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc: See next page

Enclosure:

As stated

,, DISTRIBUTION 1 Docket File.J "

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