ML18046B171
| ML18046B171 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 12/22/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| Shared Package | |
| ML18046B172 | List: |
| References | |
| TASK-08-01.A, TASK-8-1.A, TASK-RR LSO5-81-12-068, LSO5-81-12-68, NUDOCS 8112290088 | |
| Download: ML18046B171 (5) | |
Text
Doc !<et No. 50-255 LS05-8 1-12-068 Mr. David P. Hoffman Nuclear Licensing Administrator Consumers Power Company 1945 ~J. Parna 11 Road Jackson, Michigan 49201
Dear Mr. Hoffman:
December 22, 1 981
SUBJECT:
SEP TOPIC VIII-LA POTENTIAL EQUIPMENT FAILURES ASSOCIATED
~HTH DEGRADED GRiCD VOLTAGE is the staff's Safety Evaluation Report (SER) on.ijegraded Grid Voltage P_rotection for the Class 1E System. is our SER on the J\\.dequacy of Station Electric DH:tribution Voltages. Bb*oJo_s:u_ne:s l and 2, as a pair, address SEP Topic VIII-1.A.
The staff has concluded that the design of the Palisades Plant satisfy the acceptance.criteria for Topic VIII-1.A except for GIJC-17 requirements for two paths between onsite distribution and offsite power.
Compliance with GDC-17 is being reviewed under SEP Topic VII-3.
At this time the licensee has not substantiated this claim that sufficient battery capacity {more than 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />) is available to permit the delayed access patht~o be established without loss of vital steam generator level indica-tion.
Because the only issue raised in Enclosure 1 and 2 is being revieweddunder SEP Topic VII-3, the staff concluded that Topic VIII-1.A has been completed satisfactorily.
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Enclosure:
l Sincerely,
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l t Dennis M. Crutchfield, Chief T.r.lt~c sEj Operating Reactors Branch No. 5 6-s-lo.I,,
Division of Licensing Safety Evaluation Palisades Nuclear Plant cc w/enclosure:
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Mr. David P. Hoffman cc M. I. Miller, Esquire Isham, Lincoln & Beale Suite 4200 One First National Plaza Chicago, Illinois 60670 Mr. Paul A. Perry, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Myron M. Cherry, Esquire Suite 4501 One IBM Plaza Chicago, Illinois 60611 Ms. Mary P. Sinclair Great Lakes Energy Alliance 5711 Summerset Drive Midland, Michigan 48640 Kalamazoo Public Library 315 South Rose Street Kalamazoo, Michigan 49006 Township Supervisor Covert Township Route l, Box 10 Van Buren County, Michigan Office of the Governor (2)
Room 1 - Capitol Building Lansing, Michigan 48913 William J. Scanlon, Esquire 2034 Pauline Boulevard Ann Arbor, Michigan 48103 Pali sades Pl ant ATTN:
Mr. Robert Montross Plant Manager Covert, Michigan 49043 49043 PALISADES Docket No. 50-255 U. S. Environmental Protection Agency Federal Activities Branch Region V Office ATTN:
EIS COORDINATOR 230 South Dearborn Street Chicago, Illinois 60604 Charles Bechhoefer, Esq., Chairman Atomic Safety and Licensing Board Panel U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Dr. George C. Anderson Department of Oceanography University of Washington Seattle, Washington 98195 Dr. M. Stanley Livingston 1005 Calle Largo Santa Fe, New Mexico 87501 Resident Inspector c/o U. S. NRC Palisades Plant Route 2, P. O. Box 155 Covert, Michigan 49043
t' e
ENCLOSURE 1 SAFETY EVALUATION PALISADES NUCLEAR PLANT DOCKET NO. 50-255 DEGRADED GRID VOLTAGE PROTECTION FOR THE CLASS lE SYSTEM INTRODUCTION AND
SUMMARY
The criteria and staff positions pertaining to degraded grid voltage protection were transmitted to Consumers Power Company by NRC Generic Letter dated June 3, 1977.
In response to this~by letters dated July 28, 1978, October 2~ 1978 and February 27, 1980, the licensee proposed certain design modifications and changes to the Technical Specifications. A detailed review and technical evaluation of these proposed modifications and changes to the Technical Specifications was performed by EG&G, under contract to the NRC, and with general supervision by NRC staff. This work is reported by EG&G in "Degraded Grid Protection for Class lE Power Systems Palisades Nuclear Plant" (attached).
We have reviewed this technical evaluation report and concur in conclusion that the proposed electrical design modifications and Technical Specification changes are acceptable.
EVALUATION CRITERIA The criteria used by EG&G in its technical evaluation of the proposed changes include GDC-17 ("Electric Power Systems") of Appendix A to 10 CFR 50; IEEE Standard 279-1971 ("Criteria for Protection Systems for Nuclear Power Generating Stations 11 ); IEEE Standard 308-1977
("Voltage Ratings for Electrical Power Systems and Equipment - 60 Hz");
and staff positions defined in NRC Generic Letter to CPCo dated June 3, 1977.
I' PROPOSED CHANGES, MODIFICATIONS AND DISCUSSION The following electrical systems design modifications and Technical Specification changes were proposed by CPCo.
- a.
Installation of a second level of undervoltage relays on each 2400 volt Class lE bus.
The second level degraded grid voltage relaying will consist of three-out-of-three logic for each 2400 volt Class lE bus.
When the voltage is below 2192 + 32/-8 volts for 0.5 seconds, the diesel generator is started for the affected bus.
If the undervoltage condition continues for an additional six seconds the incoming breaker to the Class lE bus is tripped, load shedding is initiated, and the diesel generator breaker is closed upon establishment of satisfactory voltage and frequency by the diesel generator.
- b.
The requirement to block load shedding while the diesel generator is supplying the emergency load and to reinstate load shedding on a diesel generator trip is already incorporated into the Palisades design.
- c. Additions and changes to plant Technical Specifications including the surveillance requirements, allowable limits for the setpoint and time delay, and limiting conditions for operation have been provided by the licensee.
An analysis to substantiate the limiting conditions for operation and minimum and maximum setpoints were included as part of the modification proposal. These additions and changes have been reviewed and found satisfactory.
3 CONCLUSIONS We have reviewed EG&G 1s Technical Evaluation Report and concur in the findings that:
(1)
The proposed degraded grid modifications will protect the Class lE equipment and systems from sustained degraded voltage of the offsite power source.
(2)
The proposed Technical Specification changes are acceptable.
(3)
The existing load shedding circuit will block load shedding once the diesel generators are supplying the safety loads.
The load shedding feature will be reinstated if the.diesel generator breaker should trip.