ML19323E815
| ML19323E815 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 05/06/1980 |
| From: | Clark R Office of Nuclear Reactor Regulation |
| To: | Groce R Maine Yankee |
| References | |
| NUDOCS 8005270270 | |
| Download: ML19323E815 (4) | |
Text
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UNITED STATES j
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NUCLEAR REGULATORY COMMISSION
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May 6,1500
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Docket tio. 50-309 Mr. Robert H. Groce Senior Engineer - Licensing Maine Yankee Atomic Power Company 25 Research Drive WestScro, Massachusetts 01581
Dear Mr. Grcce:
RE: !GIliE YAliKEE ATOMIC POWER STATION We have reviewed your submittal of February 29, 1980, " Adequacy of Station Electric Distribution System Voltages,".and find that additional.information is required in order to complete our review. The attachment provides questions developed during our review.
Please respond to these questions within 45 days after receipt of this letter.
Sincerely,
. 'l L Robert A.
lark, Chief Operating Reactors Branch #3 Division of Licensing
Enclosure:
As stated cc:
See next page I
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c'c w/ enclosure (s):
E. W. Thurlow, President Mrs. L. Patricia Doyle, President SAFE -POWER'FOR MAINE Maine Yankea Atomic Power Company Post Office Box 774 Edison Drive Camden, Maine 04843 Augusta, Maine 04336 First Selectman of Wiscasset Mr. Donald E. Yandenburgh Municipal Building Vice President - Engineering U. S. Route 1 Yankee Atomic Electric Conpany Wiscasset, Maine 04578 20 Turnpike Road Westboro, Massachusetts 01581 Director, Technical Assessme,nt Division Jchr, A. Ritsher, Esquire Office of Radiation Programs Repes & Gray (AW-459) 225 Franklin Street U. S. Environmental Protection Agency Boston, Massachusetts 02110 Crystal Mall #2 Arlington, Virginia 20460 Mr. John M.. R. Paterson Assistant Attorney General State of Haine U. S. Environmental Protection Agency Region I Office Augusta, Maine 04330 ATTN:
EIS COORDINATOR Mr. Wicholas Barth JFK Federal Building Boston, Massachusetts 02203 Executive Director Sheepscot Valley Conservation Stanley R. Tupper, Esq.
Association, Inc.
Tupper and Bradley P. O. Box 125 102 Townsend Avenue Al an, Maine 04535 Boothbay Harbor, Maine 04538 Wiscassett Public Library Association David Santee Miller, Esq.
High Street 213 Morgan Street, N. W.
Wiscasset, Maine 04578 Washington. D. C.
20001 Mr. Robert R. Radcliffe Of fice of Energy Resources 55 Capitol Street Aucusta, Maine 04330 Robert M. Lazo, Esq., Chairman Atemic Safety and Licensing Board U. S. Nuclear Regulatory Comission Washington, D. C.
20555 Dr. Cadet H. Hand, Jr., Director Bodeca Marine Laboratory
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University of California Bodega Bay, California 94923 Mr. Gustave A. Linenberoer State Planning Officer Ate-1: Safety and Licensing Board Executive Department U. S. Nuclear Regulatory Comission State of Maine Washington, D. C.
20555 189 State Street Augusta, Maine 04330
1%IliE YAfiXEE (DOCKET N0. 50-359)
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REQUEST FOR' ADDITIONAL IfiFOR!MTION Ott ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES References Maine Yankee Atomic Power Company (MYAPC) letter (Robert'H. Groce) a.
to NRC, " Adequacy of Station Electric Distribution System Voltages,"
dated February 29, 1980.
b.
NRC generic letter to all Power Reactor Licensees, " Adequacy of Station Electric Distribution System Voltage," dated August 8,1979.
a Report, attachment, YAEC #120'4, " Auxiliary Power System Voltage c.
Study for Maine Yankee Atomic Power Station."
d.
MYAPC letter (Robert H. Groce) to NRC, dated September 16, 1976.
Questions I,
to the mode)l of the station auxiliary power system. Reference 1.
. Comparing a computer analysis to a system model does not verify that the analysis correctly indicates the actual plant bus and load voltages.
MYAPC should submit test procedures and verify the accuracy of the analyses per the NRC requirements (page 2, b
paragraph 3 ),
2.
Supply the calculated voltages for all low voltage AC (less than 480 V) class lE buses (including alternate sources) for each analyzed case.
Do these systems supply any instruments or control circuits as required by GDL 13?
If so, is all 'the equipment capable of sustaining the analyzed voltages without blowing of fuses, overheating, etc., and wi thout affecting the equipment's ability to perform the required function?
3.
The assumption that the reactor coolant pumps can be manually tripped (section 3.3.2.fc) is not permitted per NRC guideline b
4.
Therefore, MYAPC should provide a new analysis.
4.
Assumptions that the maximum and minimum grid voltages (sections 3.3.3.b and 3.3.2.cC) are both 120 kV is not consistent with i tems 1.b, l. f, and 4.
This letter states that 117 kV has been the minimum voltage on the grid and that 124kV has been the b
maximum.
Per I;RC guideline 6, the reference d grid voltage values should be used in the MYAPC analysis.
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5.
HRC guideline requires a separate analysis for each source of offsite power, including unit auxiliary tr.ansformer, to the c
class 1E buses. The analysis should include the following sources of power:
(a) 22 kV source through transformer x24; and (b) 115 kV source through tirtiary winding of transformer X16 unless there is an LCO for this source in the technical specifications.
b Per NRC guideline 3, the study should include starting of 5.
a large non-safety load when all class lE loads are operating.
7.
'What are the 480 V and lower equipment terminal voltages when starting the largest 480 V class lE load while all other class lE equipment are operating?
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