ML20138R156
| ML20138R156 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 12/05/1985 |
| From: | Youngblood B Office of Nuclear Reactor Regulation |
| To: | Tucker H DUKE POWER CO. |
| References | |
| NUDOCS 8512300507 | |
| Download: ML20138R156 (4) | |
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pm'o UNITED STATES e
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'8 NUCLEAR REGULATORY COMMISSION o
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WASHINGTON, D. C. 20555 I
DEC 0 51985 1'
Docket Nos.: 50-369
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and 50-370 i
Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242 i'
Dear Mr. Tucker:
l
Subject:
Technical Specification Change Request Regarding Cold Leg Accumulator Boron Requirements - McGuire Nuclear Station, linits 1 and 2 This will confinn a telephone discussion of October 30, 1985 between B. Gill of Duke Power Company and D. Hood and R. Sammons of NRC regarding your request of g
August 19, 1985 for McGuire technical specification changes. These changes, in 6
part, would increase the time to restore the boron concentration in an ECCS cold leg injection accumulator based upon the volume weighted average of the concentration of the three limiting accumulators. The limiting accumulators are understood to be that combination of three accumulators which would inject the minimum volume weighted average boron concentration assuming the accumulator of highest concentration (the fourth) spills out of.the broken RCS pipe.
The staff noted that the proposed change ti Action Statement 3.5.1.1.c2) fails i-to incorporate a lower limit on weighted a.wrage boron concentration, and re-quested that Duke revise its request to recognize a lower limit or provide I
additional justification why such is not needed. The staff illustrated its concern for including a lower limit by noting that a 'certain concentration is needed during or after the refill stage of a large-break LOCA (typically analyzed assuming no control, rod insertion) to maintain subcriticality. Accordingly, as currently proposed, the staff is unable to agree with your 10 CFR 50.92 con-E clusions (attachment III) that increasing the time to restore boron concentration (when the weighted average is below such a lower limit) would not -(1) involve a significant increase in the consequences of an accident previously evaluated, or (2) involve a significant reduction in a margin of safety.
The staff also notes that new Action Statement 3.5.1.1c would address conditions for weighted concentrations greater than or less than 1900 ppm, but not equal to 1900 ppm. The staff also recomends that you update the associated technical specification Basis and incorporate the definition of " limiting accumulators".
l 8512300507 851205
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l PDR ADOCK 05000369 P
Mr.' H. B. Tucker Pending receipt of a modification or additional justification addressing a lower limit, we propose to take no further action upon your request.
Sincerely,
/S/
B. J. Youngblood, Director PWR Project Directorate #4 Division of PWR Licensing-A cc: See next page g
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Pending receipt of a modification or additional justification addressing a lower
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limit, we propose to take no further action upon your request.
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B. J. oungbl od, Director PWW P ject D rectorate #4
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Divis on of PWR Licensing-A 1
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Mr. H. B. Tucker Duke Power Company McGuire Nuclear Station i
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l Mr. A. Carr Dr. John M. Barry Duke Power Company Department of Environmental Health
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P. O. Box 33189 Mecklenburg County 422 South Church Street 1200 Blythe Boulevard l
Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 I
Mr. F. J. Twogood County Manager of Mecklenburg County l
Power Systems Division 720 East Fourth Street i
Westinghouse Electric Corp.
Charlotte, North Carolina 28202 t
P. O. Box 355 Pittsburgh, Pennsylvania 15230 Chairman, North Carolina Utilities
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Commission Mr. Robert Gill Dobbs Building i
Duke Power Company 430 North Salisbury Street Nuclear Production Department Raleigh, North Carolina 27602 P. O. Box 33189 Charlotte, North Carolina 28242 Mr. Dayne H. Brown, Chief Radiation Protection Branch J. Michael McGarry, III, Esq.
Division of Facility Services Bishop, Liberman, Cook, Purcell Department of Human Resources and Reynolds P.O. Box 12200 l
1200 Seventeenth Street, N.W.
Raleigh, North Carolina 27605 Washington, D. C.
20036 l
Senior Resident Inspector c/o U.S. Nuclear Regulatory Commission Route 4, Box 529 Hunterville, North Carolina 28078 i
Regional Administrator, Region II I
U.S. Nuclear Regulatory Consnission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 P
L. L. Williams Operating Plants Projects Regional Manager Westinghouse Electric Corporation - R&D 701 P. O. Box 2728 Pittsburgh, Pennsylvania 15230 t
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