ML19344D818
| ML19344D818 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 08/18/1980 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Rich Smith VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 8008260003 | |
| Download: ML19344D818 (4) | |
Text
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UNITED &TATES g.
NUCLEAR REGULATORY COMMISSION "a
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AUGUST 1 8 380 Docket No. 50-271 Mr. Robert L. Smith Licensing Engineer Vermont Yankee Nuclear Power Corporation 25 Research Drive Westboro, Massachusetts 01581
Dear Mr. Smith:
We have determined that we need addi tional information in order to ccaplete our review of the information you submi tted March 17, 1980 regarding adequacy of station electrical distribution voltages.
Pl ease provide your response to the questions in the enclosure to this letter within 30 days of receipt of this letter.
Sincerely, s4:
Thoma A. Ippolito, Chief Operating Reactors Branch #2 Division of Licensing
Enclosure:
Request for Additional Information cc w/ enclosure:
See next page So08260 00 3
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' Mr. Robert L. Smith
-2 AUGUST 1 8 1933 cc:
Mr. W. F. Cor.way John R. Stanton, Director Vice President and Manager Radiation Control Agency of Operations Hazen Drive Vermont Yankee Nuclear Power Concord, New Hamoshire 03301 Corooration P. O. Box 157 John W. Stevens Vernon, Vermont 05602 Conservation Society of Southern Vermont Mr. Louis H. Heider, V.P.
P. O. Box 256 Vermont Yankee Nuclear Power Townshend, Vermont 05353 Corooration 25 Research Drive Dr. Mars Longley, Director Westboro, Massachusetts 01581 Occuoational & Radiological Health 10 Baldwin Street John A. Ritscher, Escuire Montpelier. Vermont 05602 Rooes & Gray 226 Franklin Street New England Coalition on Nuclear Boston, Massachusetts 02110 Pollution Hill and Dale Farm Laurie Burt West Hill - Faraway Road Assistant Attorney General Putney, Vermont 053a6 Environmental Protection Division Attorney General's Office Public Service Board One Ashburton Place, 19th Floor State of Vermont Boston, Massachusetts 02108 120 State Street Montpelier, verront 05602 Ronald J. Wilson 810 18th Street. N. W.
W.
D. Murohy, PlEnt Suoerintendent Suite 802 Vermont Yankee Nuclear Power Washincton, D. C.
20006 Corporation P. O. Box 157 Honorable M. Jerome Diamond Vernon, Vermont 05354 Attorney General State of Vemont David White 109 State Street Co-Director Pavilion Office Building lemont Public Interest Montoelier, Vermont 05602 Reserach Grouo. Inc.
26 State Street Mr. J. E. Griffin, President Montoeiler, Vemont 05602 Vemont Yankee Nuclear Power Corocration Vermont Yankee ?ecommissioning 77 Grove Street Alliance Rutland, Vemont 05701 5 State Street Box 1117 Vermont Yankee Deconnissioning Montoelier, Vemint 05602 Alliance 127 Main Street Brooks Memorial Library Srattleboro, Vement 05301 224 Main Street Brattleboro, Vermont 05301
W" Mr. Robert L. Smith 3
"UGUST I,
I 8 1930
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cc:
P.esident Inspector c/o V. S. NRC P. O. Box 176 Vernon, Vermont 05453 b
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REQUEST FOR ADDITIONAL INFORMATION VERMONT YANKEE ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES Ref. 1:
NRC Letter (W. Cammill) to all power reactor licensees, dated August 8, 1979 Ref. 2:
VYNPC Letter (W. F. Conway) to NRC (W. Cammill),
dated March 17, 1980 1.
Pe'r Guidelines 3 and 9 (Ref.1], confirm that the second-level of undervoltage protection relay will not drop out when the largest Non-Class 1E load starts while the Class 1E buses are fully loaded.
Also, verify per NRC Cuidelinec 1.0 and 12 that the second-level (degraded volcage) of undervoltage protection setpoints (voltage and time-delay) will not spuriously separate the Class 1E bus from offsite sources when the auxiliary loads normally supplied from the unit auxiliary transformer are transferred to the startup transforcer for each case analyzed.
2.
Do you have a delayed source of power to the Class 1E buses through the Unit Auxiliary Transformer (T-2)? Also, is there a design feature that either T-3A or T-3B could supply both redundant load groups?
If so, provide the required analysis (Ref. 1, Guideline 1].
3.
Submit the calculated voltages for all low-volage AC (less than 480 volts)
Class 1E buses (including all alternate scurce connections) or documenta-tion which demonstrates that all low-voltage AC Class lE equipment will be operating within its required voltage ratings for each case analyzed.
Do these buses supply instrumentation or are control circuits required by GDC 13? If so, is all eauipment capable of sustaining the analyzed voltages without blowing fuses, overheating, and without affecting the equipment's abilty to perform the required function.
._.