ML19344F019
| ML19344F019 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 08/20/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| References | |
| TASK-08-01.A, TASK-8-1.A, TASK-RR NUDOCS 8009120284 | |
| Download: ML19344F019 (4) | |
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UNITED STATES 4
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August 20, 1980 5
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j Dockat No. 50-29 5
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Mr. James A. Xay Senior Engineer - Licensing Yankee Atomic Electric Company 1
25 Research Drive N
Westborough, Massachusetts 01581 i
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Dear Mr. Kay:
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You are requested to provide the information specified in the enclosure to this letter regarding the adequacy of station electric distribution system voltages for the Yankee Rowe Atomic Power Station. A copy of
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the enclosure was telecopied to you on August 18, 1980. Receipt of your r.
response is requested within 75 days of your receipt of this letter.
Sincerely.
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Dernis i. Crutchfield, phief Ooerating Reactors Branch #5 Division of Licensing
Enclosure:
Request for Additional Infomration cc w/ enclosure:
See next page i
8009120SN
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2-August 20, 1980 Mr. James A. Kay cc w/ enclosure:
Mr. Jarnes E. Tribble, President Yankee Atomic Electric Comany 25 Research Drive Westborot.gh, Massachusetts 01581 Greenfield Cormunity College 1 College Drive Greenfield, Massachusetts 01301 Chairman Board of Selectmen Town of Rowe Rowe, Massachusetts 01367 Energy Facilities Siting Council 14th Floor One Ashburton Place Boston, Massachusetts 02108 Director, Technical Assessment Division Office of Radiation Programs (AW-459)
U. S. Environmental Protection Agency Crystal Mall #2 Arlington, Virginia 20460 U. S. Environ::wntal Protection Agency Region I Office ATTN: EIS COORDINATOR JFK Federal Building Boston, Massachusetts 02203 Resident Inspector Yankee Rowe Nuclear Power Station c/o U.S. hRC Post Office Box 28 Monrce Bridge, Massachusetts 013E0 4
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's REQUEST FOR ADDITIONAL INFORMATION YANKEE R0WE ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES Ref. 1: NRC Letter (W. Cammill) to all power reactor licensees, dated August 8, 1977 Ref. 2: YAEC Letter (J. A. Kay) to NRC (D. L. Ziemann), dated February 22, 1980 1.
The voltage analyses submitted in Ref. 2 were performed using both station service transformers 2 and 3 supplying the two required Class 1E buses for emergency conditions. Submit an analysis assuming only one station service transforner (2 or 3) is in service prior to an accident or identify limiting conditions of operation. Maximum loading would then be when both tie breakers (1224 and 4548) are closed.
2.
Per Guidelines 3 and 9 [Ref. 1], confirm that the second-level of under-voltage protection relay will not drop out when the largest Non-Class lE load starts while the Class lE buses are fully loaded.
3.
Submit the calculated voltages for all low-voltage AC (less than 480 volts)
Class 1E buses or documentation which demonstrates that all low-voltage AC Class lE equipment will be operating within their required voltage ratings for each case analyzed.
Do these buses supply any instruments or control circuits required by GDC 13? If so, is all equipment capable of sustaining the analyzed voltages without blowing fuses, overheating, etc.,
and without af fecting the equipment's ability to perform the required function.
' 4.
The test verification voltages and deviations were given for the 2400-volt and 480-volt Non-Class 1E buses [Ref. 2, page 28].
Submit the test verification voltages and deviations for the 480-volt Class lE buses.
5.
Ref. 2,' page 4 states that the HPSI and LPS1 pump motors have.been verified by test to start at 80% and 60% respectively of rated voltage.
Is the manufacturer's rated minimum starting voltage for the HPSI and LPSI pump motor the same? If not, submit the rated voltage.
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6.
Ref. 2 states that voltage regulators were installed on the secondary side of the 115 KV/2.4 KV station service transformers.
Submit regulator specifications concerning such items as the type of regulator (automatic or manual), time frame before the initial regulating sequence starts, operating time at and between each regulating step, voltage step percentages, and the regulated nominal voltage (with tolerances).
Compare the regulator specifications with the undervoltage protection relays' setpoints and the Class 1E equipment voltage ratings.