ML19336A666
| ML19336A666 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 10/02/1980 |
| From: | Clark R Office of Nuclear Reactor Regulation |
| To: | Groce R Maine Yankee |
| References | |
| NUDOCS 8010300437 | |
| Download: ML19336A666 (3) | |
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UNITED STATES s,
g NUCLEAR REGULATORY COMMISSION y
a WASHINGTON, D. C. 20655 t
8 October 2, 1980
%, +....f Docket No. 50-309 Mr. Robert H. Groce Senior Engineer - Licensing Maine Yankee Atomic Power Company 25 Research Drive Westboro, Massachusetts 05181
Dear Mr. Groce:
We have reviewed your letters dated July 18, 1977 and July 2,1980 concerning degraded grid voltage protection and we find that the Maine Yankee Atomic Power Station is not in full compliance with our require-ments.
Enclosed are four staff positions for which we require your response within 30 days after receipt of this letter.
Sincerely,
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Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing cc: See next page 4
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Mrs. L. Patricia Doyle, President
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E. W. Thurlow, President SAFE POWER FOR MAINE I
i Maine Yankee Atomic Power Company Post Office Box 774 Edison Drive Camden, Maine 04843
. Augusta, Maine 04336
-s First Selectman of Wiscasset Mr. Donald E. Vandenburgh Municipal Builcing
.Vice President - Engineering.
U. S. Route 1 Yankee Atomic Electric Company Wiscasset, Maine 04578 20 Turnpike Road WestDoro, Massachusetts 01581 Director, Technical Assessment Division John A. Ri tsher, Esquire Office of Radiation Programs Ropes & Gray (AW.459) 225 Franklin Street U. S. Environmental Protection Agency Boston, Massachusetts 02110 Crystal Mail #2 Arlington, Virginia 20460 Mr. John M. R. Paterson Assi stant Attorney General U. S. Environmental Protection Agency State of Maine Regien I Office Augusta, Maine 04330 ATTN:
EIS COORDINATOR JFK Federal Building Mr. Nicholas Sarth Boston, Itassachuse -
02203 Executive Director Sneepsco Valley Conservation Stanley R. Tupper Association, Inc.
supper and dracle P. C. Box 125 102 Townsend Avena Alan, Maine 04535 Boothbay Harbor,. Maine 04538 Jiscassett Public Liorary Associati:n Davic Santee Miller, Esq.
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.ciscasset. Maine 04578 Washington, D. C.
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ENCLOSURE r
STAFF POSITIONS ON DEGRADED GRID VOLTAGE PROTECTION DOCKET NO. 50-29, 50-271, 50-309 REFERENCES (a) USNRC Letter, dated June 3,1977 (b) MYAPC Letter, dated July 18, 1977 (c) YAEC Letter, dated July 24, 1980 1.
Staff Position 1 of reference (a) requires coincident logic in the voltage protection scheme to preclude spurious trips of the off-site power source.
The proposed logic in reference (c) does not preclude spurious trip of off-site source in all cases and therefore the required coincident logic should be provided in accordance with Table 3.3-3 in enclosure 2.of reference (a).
2.
Staff Position 1 of reference (a) also required Technical Specification trip changes including limiting conditions for operation, surveillance [or second setpoints with minimum and maximum limits, and allowable values level voltage protection monitors.
The required changes to the Technical Specifications should be submitted in accordance with Tables 3.3-3, 3.3-4 and 4.3-2 in enclosure 2 of reference (a).
3.
Staff Position 2 of reference (a) requires that load shedding on the emergency buses be prevented from occurring when the diesel generator is supplying power to all the sequenced loads and that the load shedding feature be reinstated automatically when the diesel generator circuit breaker is tripped.
Reference (b) indicates that there is an automatic by-pass of the load shedding feature.when the diesei generator circuit breaker is closed, however the reinstatemcnt of the feature is not provideds The bypassing of a protective function (i.e. load shedding) should meet the requirements of IEEE 279-1 971 paragraph 4.12 by removing the bypass automatically whenever the permissive condition (i.e. diesel generator breaker closed) is not met. The licensee should revise its design to meet these requirements.
4.
Staff Position 3(b) of reference (a) requires that the diesel generators operate for at least five minutes wnile loaded with the emergency loads.
The proposed Technical Specification section 4.5.A.2 of reference (b) does not meet this requirement. Tne licensee should submit Technical Specification changes to include this requirement.