ML20033B947
| ML20033B947 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 11/24/1981 |
| From: | Olson R L BALTIMORE GAS & ELECTRIC CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8112020494 | |
| Download: ML20033B947 (6) | |
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BALTIMORE GAS AND i
ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 November 24,1981 ELECTRIC ENGINEERING DEPARTMENT A
Office of Nuclear Reactor Regulation
?[& (N 9 U. S. Nuclear Regulatory Commission g
Washington, D.C. 20555
.NOJg f Attn:
Mr. Robert A. Clark, Chief DE01 198 % Tg :
Operating Reactors Branch #3 f.,
u.s.
i Division of Licensing
\\%
47 p
Subject:
Calvert Cliffs Nuclear Power Plant s
e Unit No.1 & 2, Docket No. 50-317 & 50-318 4
Adequacy of Station Electric Distribution System
Reference:
NRC letter dated 8/25/81 from R. A. Clark to A. E. Lundvall, Jr.
Gentlemen:
The referenced letter requested additional information concerning our previous submittals of 10/8/79, 6/20/80 and 3/31/81 on the adequacy of station electric distribution system voltages at Calvert Cliffs.
The specific requests of the referenced letter are repeated below along with our responses.
1.
SUBMIT THE SERVICE FACTOR RATING FOR THE 4000 VOLT AND THE 460 VGLT CLASS lE MOTORS.
RESPONSE
Listed below are the Class IE motors and their service factors:
Description Voltage HP S. F.
Salt Water Pp 11, 12, 13, 21, 22, 23 4 kV 450 1.15 Service Water Pp 11,12,13,21,22,23 4 kV 400 1.15 HPSI Pp 11, 12, 13, 21, 22, 23 4 kV 400 1.15 Containment Spray Pp 11,21,22 4 kV 200 1.15 Containment Spray Pp 12 4 kV 300 1.15 8112020494 811124 0
PDR ADOCK 05000317
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-2 Description Voltage 11P S.F.
LPSI Pp 11,12,21,22 4 kV 400 1.15 Containment Air Coolers 11, 12, 13, 14, 21, 22, 23, 24 460V 125/62.5 1.15 Charging Pp 11,12,13,21,22,23 460V 100 1.15 Containment Filter Unit 11,12,13,21,22,23 460V 75 1.15 Component Cooling Pp 11,12,13,21,22,23 460V 150 1.15 Control Rm A/C Compressor 11,12 460V 100 1.37 Swgr. Rm A/C Compressor 11,12,21,22 460V 100 1.15 Spent Fuel Pool Cooling Pp 11,12 460V 100 1.15 Penetration Rm Exhaust Fan 11,12,21,22 460V 5
1.15 Control Rm Condenser Fan 11,12 460V 2@7.5 1.15 Salt Wtr Air Compressor 11,12,21,22 460V 10 1.15 Battery Rm Exhaust Fan 11 460V 1
1.15 Boric Acid Pp 11,12,21,22 460V 25 1.15 Aux Feedwtr Pp Rm Vent Fan 11,12,21,22 460V
.75 1.15 ECCS Pp Rm Exhaust Fan 11,12,21,22 460V 5
1.15 Control Rm HVAC Fan Unit 11,12 460V 40 1.15 Swgr. Rm HVAC Fan Unit 11,12,21,22 460V 10 1.15 Control Rm Filter Fan 11,12 460V 3
1.0 ECCS Pp Rm Cooler 11,12,21,22 460V 7@l.0 1.15 Swgr. Rm Condenser 11,12,21,22 460V 2-5 1.0 Control Rm Return Air Fan 11,12 460V 30 1.0 H2 Purge Replacement Air Blower (2 ea) 460V 3
1.15 Battery Rm Supply Fan 460V 1
1.15 D.G.ll,12, 21 Fuel Oil Trans Pp 460V 1/2 1.0 D.G.ll,12, 21 Air Compressor 460V 5
1.15 D.G.ll,12, 21 Vcnt Fan 460V 10 1.2
f.
2.
SUBMIT ADDITIONAL INFORMATION ON THE FOLLOWING ITEMS STATED IN REF.1, PAGE 5.
(a) WHICH STARTER CONTROL CIRCUIT FUSES WERE REPLACED AND THE' FUSE RATING (BEFORE AND AFTER)?
RESPONSE
The following motor control center (MCC) starters have had their contactor fuses replaced:
MCC STARTER STARTER SIZE OLD FUSE NEW FUSE 52-10405 3
3 4
52-11410 3
3 4
52-11435 3
3 4'
52-11465 3
3 4
52-IlG(1A) 4 5
6 52-12G(1 A) 4 5
6 42-1N1411(1 A) 4 5
6 52-1N0411(1 A) 4 5
6 52-20410 3
3 4
52-20433 3
3 4
52-21410 3
3 4
52-31463 3
3 4
52-21467 3
3 4
52-21G(1A) 4 5
6 i
(b) WHICH CONTROL TRANSFORMERS WERE REPLACED AND THE SIZE?
RESPONSE
The following motor control center starters have had their control transformers replaced.
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MCC STARTER STARTER SIZE OLD XFMER NEW XFMER 52-10406 2
SOVA 150VA 52-10405 3
150VA 350VA 52-11410 3
150VA 350VA 52-11435 3
150VA 350VA 52-11465 3
150VA 350VA 52-11464 2
50VA 150VA 52-20410 3
150VA 350VA 52-20433 3
150VA 350VA 52-21410 3
150VA 350VA 52-21467 3
150VA 350VA 52-21463 3
150VA 350VA 3.
CASE 7 OF REF.1 ADDRESSES THE OVERVOLTAGE CONCERN (GUIDELINE 11, REF. 2) DURING MINIMUM PLANT LOAD CONDITIONS AND MAXIMUM OFFSITE GRID VOLTAGE. THE LOADING CONDITION IS DEFINED AS ALL AUXILIARY LOADS UNDER NORMAL PLANT SHUTDOWN. DOES THIS REPRESENT THE " MINIMUM" PLANT LOAD CONDITION RATHER THAN DURING REFUELING FOR EXAMPLE. IF NOT, DEFINE THE " MINIMUM" PLANT LOAD CONDITION AND SUBMIT AN ANALYSIS AT ALL CLASS lE VOLTAGE LEVELS.
RESPONSE
i This represents minimum plant load.
l l
4.
SUBMIT THE FOLLOWING ANALYZED VOLTAGES AND/OR EQUIPMENT RATINGS:
(a) MINIMUM PICKUP AND MAXIMUM DROPOUT VOLTAGES FOR THE 120-VOLT MOTOR CONTROLLER CONTACTORS.
RESPONSE
120V MCC Contactors Minimum pickup voltage 84.5 %
Maximum dropout voltage 65 %
We have undertaken extensive testing of the 120V contactors to determine the minimum pickup voltage of 84.5%. We conservatively estimate the maximum dropout voltage to be 65%, but we have not verified this by test.
[
_5-(b) STEADY STATE AND TRANSIENT VOLTAGES FOR THE 120-VOLT CONTACTORS FOR THE WORST CASES OF MAXIMUM GRID-MINIMUM LOAD AND MINIMUM GRID MAXIMUM LOAD CONDITIONS (CASE 7 OF REF.1 AND CASE 6 OF REF. 2)
RESPONSE
Steady state and transient voltages at contactors for the worst cases of maximum grid voltage minimum load condition (Case 7 Ref.1) and minimum grid voltage maximum load condition (Case 6 Ref. 2).
Max Voltage Min Voltage Min Load Max Load Case 7 Ref.1 Case 6 Ref. 2 (Steady State)
ESFAS Starting ESFAS Running MCCI14R 1.0735
.7634
.8704 (c) WORST CASE TRANSIENT VOLTAGE AT THE 120-VOLT CONTACTOR LEVEL DURING THE STARTING OF THE LARGE NON-CLASS lE LOAD (CASE 3 OF REF. 2)
RESPONSE
Worst case transient voltage at contactors during starting of large non Class IE load (Case 3 Ref. 2)- condensate booster pump (CBP)
Min Voltage Max Load Case 3 Ref. 2 CBP Start CBP Running MCCll4R
.8162
.8969 5.
CLARIFY THE CORRELATION BETWEEN THE TEST RESULTS SUBMITTED IN REF. 3 TO THE ANALYTICAL VALUES OF THE CORRESPONDING CASES IN REF.1. ALSO SUBMIT THE PERCENT ERROR DIFFERENCES IN THE COMPARISON AT EACH CLASS lE VOLTAGE LEVEL.
RESPONSE
Running Starting Running Aux Load ESF Start Aux and ESF Bus Case 1 Case 5 Case 6 Bus Voltage No.
Calc./ Meas /%
Calc./ Meas /%
Calc./ Meas /%
3 4.16 kV 21
.942/.99/5 %
.853/.909/6.6 %
.924/.978/5.8 %
7 480V 21A
.946/1.00/5.7 %
.817/.829/1.5 %
.917/.975/6.3 %
8 480V 21B
.950/1.00/5.3 %
.816/.829/1.5 %
.913/.963/5.5 %
.s We trust that this information will contribute positively to the resolution of this long-standing issue. However, if you still require additional inforination, please contact us.
Very truly yours, 1
/
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R. C. L. Olson Principal Engineer Nuclear Licensing & Analysis Unit
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cc:
- 3. A. Biddison, Esquire G. F. Trowbridge, Esquire Mr. D. H. Jaffe i
Mr. R. E. Architzel f
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