ML18046A773
| ML18046A773 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 06/24/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| LSO5-81-06-099, LSO5-81-6-99, NUDOCS 8107090106 | |
| Download: ML18046A773 (6) | |
Text
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June 24, 1981.
NRC PDR Dofket No. 5~-255 LS05-8l-06-099
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Local PDR
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Mr. David P. Hoffman Nuclear Licensing Administl'!~:~P..t Consum~rs Power Company 1945 W. Parna11 Road jackson, Michigan 49201
Dear Mr. Hoffman:
ocrutchfiel d HSmith TWambach JLombardo QELD OI&E (3}
ACRS * (lO)
NSIC TERA
SUBJECT:
ADEQUACY OF STATION ELECTRIC DISTRIBUTION _SYSTEM VOL:f.AGES RE:
!>(l11l'ades Plant We have rev1e_wad your submittal-of*-March 3, 1981 as well as the other submittals listed as references in the enclosure to this letter.
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. -- -'We find -that additional info'i':mat1on, as indicated in the enclosure, is required to complete our review.
Please respond within 30 days of receipt of this letter.
Enclosure:
.Request for Ad~itiona1 Infonnation cc w/enclo~(Jre:
See next p_age Sincerely, Original signed by Dennis M. Crutchfield, Chief Operating Reactors Branch #5 D1visfon of licensing -
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"'* USGPO: 1980-329*824
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'any 212 West Michigan Avenue Jackso~, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Co~any 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 'ori ve.
Mi~land, Michi~an 48640 Kalamazoo PcJblic Library 315 South RJse Street Kalamazoo, Michigan 49006 Township Supervisor Covert Township Route 1, Box.10
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. Van Buren County, Michigan 49043 Office of the Governor (2)
Room l - Capitol Building
- Lansing, Michigan 48913 William J. Scanlon, Esquire 2034 Pauline Boul~vard Ann Arbor, Michigan 48103 Palisades Plant ATTN:
- Mr. Robert Montross Plant Manager Covert, Michigan 49043 June 24, 198_1
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- u. s. Environmental P-rotectian Agency Federal Activities Branch Region V Office ATTN:
EIS COORDINATOR 230 South Dearoorn Street Chicago, Illinois. 60604 Charles Bechhoefer, Esq., Chairman Atomic Safety and Licensing Board Panel
- u. s. Nuclear Regulatory Corrmission Washington, o.* c.
20555 Dr. George C. Anderson Department of Oceanography University of Washington Seattle, *--was hi ngton - 98195 Or. M.
Stanl~y Livingston 1005 Calle Largo Santa Fe, New Mexi~o 87501 Resident Inspector c/o U.
S~ NRC P. o. Box 87 South Haven, Michigan 49090
REQUEST FOR ADDITIONAL INFORMATION
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Docket No. 50-255 ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES
References:
- l.
NRC letter, l~i 11 i am Gammi 11, to a 11 Power Reactor Li ~nsees (Except
- Humboldt ~ay), "Adequacy of Station Electric Distribution Systems Voltage," August 8, 1979.
- 2.
CPCo letter, David P~ Hoffman, to Director, Nuclear Reactor Regula-tion, NRC, "Adequacy of Station Electric Distribution Systems Volt-ages,"* January 9, 1980;
- 3.
CPCo letter, Roger W. Huston, to Director of NuC:lear Reactor Regula-tion, NRC, "Response to Adequacy of Station Ele.ctric Distribution Systems Voltages," March.7, 1980.
- 4.
CPCo letter, Steven R. Frost, to Director, Nuclear Reactor Regulation, NRC, "Response to Vf:rification of Analytical Models for Adequacy of
- Station Power,"
July 18, 1980.
- 5.
CPCo letter, David P. Hoffman, to Director, Nuclear Reactor Regulation, NRC, "Response to Adequacy of Station Power,"
August 22, 1980.
- 6.
CPCo le:ter, David. P. Hoffman, to Director, Nuclear Reactor R~gulat~on, NRC, "Response to Station Electric Distribution System Voltages,"
February 9, 1981.
- 7.
CPC6 l~tter,.Steven R. Frost, to Director, Nuclear Reactor Regulation, NRC, "Response to Adequacy of Station Electric Distribution System Voltages,"
March J, 1981.
- 8.
NRC l~tter, D. Crutchfield to D. P. Hoffman, "Loss of Offsite Power Status Report, Revision 2," October 10, 1980.
The NRC requested an analysis that shows the adequacy of the offsi~e power sour~es in conjunction with the onsite ~distr_ibution system for supplying power to the class 1E equipment under various c.ombinations of grid voltage and plant loads(l)
The request also stated that "remedial action should be taken inmediately" should any pot~ntial violaiions of GDC-17 or voltage requirements of safety loads" be determined.
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REQU.E,FOR ADDITIONAL INFORMATION re PALISADES Plp;-NT Docket No. 50-255 ADEQUACY OF STATION (LECTRIC-D-ISTRIBLJTIOff SYSTEM VOLTAGES --
Our review of the CPCo submittals (references 2-7) indicate that potential problems exist in the following areas:
- 1.
CPCo h'at shown in the speed torque curves (7) that the majority of the
.Class lE motors will start, under load, when the motor terminal voltage is 70%.
Verify that.all Class lE loads will start when the motor terminal voltage is 70% (or some other specified level) and deliver the capacity required to mitigate the consequences of an accident.
. 2.
CPCo has shown that the 460V and 440V motors and the 480V battery chargers do not have sufficient voltage to operate continuously with maximum unit loads concurrent.with the offsite grid at 95% of nominal.
Moreover, the voltage at the 480V contactors is less than that required to pick up additional loads that may be required by an accident.
Additionally the instruments needed.in an accident situation*will not have adequate voltage. to provide correct readout under the voltage conditions in question 2 with the 120V AC instrument bus supplying power
.to the 120V AC preferred instrument bus.
It is apparent that the 480V battery charger could be required to operate at less than the rated minimu~ input voltage (432V) while under a degraded condition without operation of the second level undervoltage relays. Operation under this condition would discharge the batteries.
The FSAR assumes that these batteries wil1 be fully charged prior to a design basis accident.
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Based upon--the-aEove-,--eitfier--d-emonstrate that-our-find-i-ngs_a~e_no_t_ ______________ _
correct or provide proposed modifications ~nd schedules to correct these deficiencies.
The degraded grid. voltage relay setpoint (91.4% + 0.13%) is higher thart the minimum expected continuous operating ~oltage for 2400V buses lC and lD (87.3% of 2400V).
The loss of voltage relay setpoint (77.5%
+ 3.3%)is higher than the minimum analyzed.*motor starting transie~t.
Based on the CPCo submittals; it is not evident that the time delay for either the degraded grid voltage relays or the loss of voltage relays is sufficient to ride through all expected motor starting transient dips wh~n the grid is at 95% and the unit loads are maximum.
It appears that there may be potential for. spuriciusly separating the Class
. TE buses from the offsite sourc~ by operation of either the loss of vo)tage ot second level undervoltage relays.
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