ML20137S173
| ML20137S173 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 11/29/1985 |
| From: | Youngblood B Office of Nuclear Reactor Regulation |
| To: | Tucker H DUKE POWER CO. |
| References | |
| NUDOCS 8512060178 | |
| Download: ML20137S173 (3) | |
Text
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UNITED STATES
- 8 NUCLEAR REGULATORY COMMISSION o
h WASHINGTON, D. C. 20555
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NOV 2 91985 Docket Nos.: 50-369 and 50-370 Mr.11. B. Tucker, Vice President Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242
Dear Mr. Tucker:
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Subject:
Auxiliary Building Filtered Ventilation System Testing,
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McGuire Nuclear Station, Unit I h
We have reviewed your letter of October 28, 1985, which addressed the NRC inspection of the McGuire Station's auxiliary building filtered ventilation i
(VA) system and the lack of a pre-operational air distribution test for the system. We also reviewed the attachments to your letter which addressed the Unit I test procedures, its acceptance criteria and test results.
In view of the fact that greater than 98% of the air distribution measure-i ments were within the acceptance criteria of 20% and the few failures fell only marginally outside the criteria, we conclude that the air flow distribution through the HEPA filters and -:arbon beds of both VA units is j-suitably uniform and the units should be mnsidered to be operable.
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For future reference, the acceptance test criteria for the charcoal adsorber l
air distribution measurements should be based upon a comparison of each individual measurement with the average of all measurements, not the average j
of all slot measurements compared to each vertical slot's average. Also, staff experience with hot-wire anemometers indicates that they are subject to relatively large measurement error under turbulent flow conditions.
Con-sideration should be given to use of a pitot tube or a vane anemometer for future tests.
Duke has volunteered to provide additional assurance on the adequacy of the carbon by performing an additional laboratory test. However, we wish to em-phasize that the temperature at which these tests are conducted is of greater concern to the NRC staff than is the lack of uniform flow. Technical Specifi-cations 3/4.7.7 for McGuire, Units 1 and 2, involve Revision 2 of Regulatory Guide 1.52 and, therefore, specify a laboratory test temperature of 80 C for this system. Recent studies have shown this to be inappropriately high for air cleaning systems which are not expected to be subjected to elevated tem-peratures and will result in erroneous indications of charcoal quality.
Effort is underway generically to standardize on a test temperature of 30*C l
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A NOV 2 91985 Mr. H. B. Tucker j
Duke Power Company McGuire Nuclear Station cc:
Mr. A. Carr Dr. John M. Barry Duke Power Company Department of Environmental Health P. O. Box 33189 Mecklenburg County 422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 Mr. F. J. Twogood County Manager of Mecklenburg County Power Systems Division 720 East Fourth Street Westinghouse Electric Corp.
Charlotte, North Carolina 28202 P. O. Box 355 Pittsburgh, Pennsylvania 15230 Chairman, North Carolina Utilities Commission Mr. Robert Gill Dobbs Building Duke Power Company 430 North Salisbury Street i
Nuclear Production Department Raleigh, North Carolina 27602 P. O. Box 33189 j
Charlotte, North Carolina 28242 Mr. Dayne H. Brown, Chief t
Radiation Protection Branch J. Michael McGarry, III, Esq.
Division of Facility Services i
Bishop, Libennan, Cook, Purcell Department of Human Resources and Reynolds P.O. Box 12200 1200 Seventeenth Street, N.W.
Raleigh, North Carolina 27605 Washington, D. C.
20036 Senior Resident Inspector c/o U.S. Nuclear Regulator / Commission Route 4, Box 529 Hunterville, North Carolina 28078
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Regional Administrator, Region II
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U.S. Nuclear Regulatory Commission, 3
101 Marietta Street, N.W., Suite 2900 l
Atlanta, Georgia 30323 L. L. Williams Operating Plants Projects Regional Manager Westinghouse Electric Corporation - R&D 701 P. O. Box 2728 Pittsburgh, Pennsylvania 15230 l
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N goJ W29 M Mr. H. B. Tucker for such systems. Several utilities have volunteered to revise their tech-nical specifications and adopt the 30 C test temperature in order to assure a more meaningful assessment of the capability of the carbon beds. The staff i
recognizes that such a change may require relaxation of the acceptance criteria for the laboratory test.
As discussed in the November 1,1985, conference call between your staff and the NRC, we recommend that the technical specifications for McGuire Units 1 and 2 for the VA system be revised to reference the 1980 version of ANSI /ASME N510 in anticipation of future modifications requiring that the air flow distribution test be repeated. Such a revision now would eliminate the need for a future reaffirmation of the adequacy of a deviation from the present technical specifications.
If you have any questions regarding this letter, please contact your Project Manager, Darl Hood at (301) 492-8408.
Sincerely, i
B. J. Youngblood, Director PWR Project Directorate #4 Division of PWR Licensing-A, NRR cc: See next page 5IRIstH4tN:
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