ML20004G095
| ML20004G095 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 06/22/1981 |
| From: | Linder F DAIRYLAND POWER COOPERATIVE |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-01.A, TASK-8-1.A, TASK-RR LAC-7619, NUDOCS 8106290171 | |
| Download: ML20004G095 (3) | |
Text
g-5 DlDA/RYLAND h
h COOPERAT/VE P.O BOX 817 2615 EAe( AV SOUTH. LA CROSSE. WISCONSIN 54601 (608) 788-4000 June 22, 1981~
In reply, please refer to I AC-7619 DOCKET NO.
0-409 C;. f
(
S m.etor Regulation Di::ector of Nt ATTN:
Mr. Dennis cl. Crutchfield, Chief Division of Operating Reactors
,k.-
4 Operating Reactors Branch #5 3gOgi[gY C'
U. S. Nuclear Regulatory Commission j-Q Washington, D. C.
20555
\\g g p, *
SUBJECT:
DAIRYLAND POWER COOPERATIVE
\\D LA CROSSE BOILING WATER REACTOR (LACBWR) h" }
PROVISIONAL OPERATING LICENSE NC. DPR-45 ADEQUACY OF STATION ELECTRICAL DISTRIBUTION SYSTEM VOLTAGES (SEP TOPIC VIII-1. A)
References:
(1)
DPC Letter, Linder to Gammill, LAC-6822, dated March 13, 1980.
(2)
DPC Letter, Linder to Gammill, LAC-6912, dated May 12, 1980.
(3)
DPC Letter, Linder to Crutchfield, LAC-7160, dated September 17, 1980.
(4)
NRC Letter, Crutchfield to Linder, dated February 18, 1981.
(5)
Telecom; J. Shea-NRC, A. Udy-EG&G Idaho, Inc; R. Shimshak and W. Nowicki, DPC; November 5 and 6, 1980.
Gentlemen:
In your letter (Reference 4) you indicate that your consultant's (EG&G) review of the DPC analysis shows that, with the offsite grid at the minimum, voltages can be below the rating of two types of IE equipment.
EG&G QUESTION:
The DPC analysia indicatce that it is poccible to have a controt voltage of 102.8V at the 460V contactore during a LOCA.
DPC has ateo indicated (Reference 5) that the control voltage to these contactore is rated at 11SV t' 10% for' continuous operation (103.SV minimum).
Further, the DPC analycio verification test choue that the actual vcitage is as much ao 1.09% touer than the analynod voltagc.
Please report the approximate duration of the tou voltage condition at the 460V contactora and provide reasonable accurance that the contactora vitt operate satiofactority at 101. SV (102.8 - 1. 09% of 11SV) during this intervat. 0100290
}
t
y Mr. Dennio M. Crutchfield, Chisf LAC-7619 x '1 Operating-Re ctora Brcnch #5 Juno"22, 1981t DPC RESPONSE:-
Since we have never experienced a degraded voltage in our 14 years of operation, we have no way of determining the approximate duration of a low voltage condition.
We have conducted actual bench test of our 460 volt contactors to insure they will operate at a low voltage.
The tests conducted on March 11, 1981 indicate the contactor coil will pick up at approximately 82 to 85 volts which is 16.5 volts below your low voltage of 101.5 volts.
A second test was completed on a complete spare MCC contactor unit using 100 volts and operated for an eight-hour period.
No detrimental effects or heating were noted during or after this test.
The unit operated properly.
This indicates to us that the MCC contactors manufactured by Allis-Chalmer which are used at the LACBWR facility would operate properly on a degraded voltage of 100 volts for an eight-hour period.
We would not expect a degraded voltage to last eight hours.
EG&G OUFSTION:
The DPC analysis shova that it is possible to have a voltage of 40GV supplied to the 480V dieset plant battery charger during a LnCA.
This battery charger is rated at 480V t 10% (432 minimum)(Reference 5).
Further, the DPC analycia verification test shove that the actual voltage is as much ao 1. 09% tower than the analyzed voltage.
The voltage to this battery c'.arger must be improved.
Please deceribe or qualify it for operation at 400.8V (406V - 1.09% of 480V) for that period of time the too voltage condition c=icto on the battery' charger.
Please deacribe.
DPC RESPONSE:
We have contacted the manufacturer of the diesel plant battery charger.
The manufacturer indicated that the battery charger will automatically shut down on a low voltage, due to lack of SCR control, and would automatically return to normal service when the voltage returns within ratings.
This low voltage will not damage the charger.
If a degraded voltage turns off the charger, it should have no detrimental effect on the DPC diesel plant system because the battery bank that is being charged by this charger will carry its rated load for a period of eight hours.
This battery capacity test has been completed and is a required Technical Specification Test.
A degraded, grid voltage should not damage the battery charger.
The charger should return to normal operation when the voltage returns to j
normal.
The storage battery bank should carry the rated load and l
supply D.C. power during a degraded grid voltage for an eight-hour duration.
. I
..o Mr. Dennis M. Crutchfield, Chief LAC-7619 Operating Reactors Branch #5 Junen22,,1981.
1 If you have any further questions, please contact ns.
Very truly yours, DAIRYLAND POWER COOPERATIVE f
/Giss Oi Frank Linder, General Manager FL:WRN:af cc:
J. G. Keppler, Reg. Dir., NRC-DRO III NRC Resident Inspectors t
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