ML20032E440
| ML20032E440 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 11/12/1981 |
| From: | Withers B PORTLAND GENERAL ELECTRIC CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8111200561 | |
| Download: ML20032E440 (7) | |
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November 12, TG Trojan Nuclear Plant Docket 50-344 License NPF-1 Director of Nuclear Reactor Regulation ATTN:
Mr. Robert A. Clark, Chief Operating Reactors Branch No. 3 Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555 i
Dear Sir:
Testing the Motor-Driven Auxiliary Feedwater Pump on an Emergency Diesel Generator Your letter dated April 16, 1981, which forwarded Amendment 57 to the Trojan Facilit.v Operating License N/F-1, requested that PGE conduct a test of the capability to start and run the motor-driven auxiliary feed-water (AFW) pump on an emergency diesel generator. The Safety Evaluation 4
i Report for Amet.dment 57 provided specific criteria which the test should verify. We have analyzed the emergency diesel generator capabilities and determined that it can start and cerry a load as large as the motor-driven AFW pump and that this operation meets the criteria of the Amendment 57 l
Safety Evaluatiun Report, as clarified in the attached evaluation.
In addition. Power Systems, a division of Morrison-Knudsen, has assured PGE i
that the diesel engine can handle the anticipated transient without dif-ficulty; and Parsons Peables-Electric Products, Inc. has stated that the generator and voltage regulator can perform this function satisfactorily.
Although we are confident that our emergency diesel generators can start and continuously operate this load, we do not feel that it would be prudent to perform a test to verify this. The motor starting current approaches the design limits of the generator and we do not consider it good engineering practice to operate the diesel generator in this manner without an act.ual need to do so.
Because of this, we believe that start-ing the motor driven AFW pump on an emergency diesel generator would be justifiable only for an emergency situation.
8111200561 011112 PDR ADOCK 05000344 J > (,8 1
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Portland General ElechicCompany Mr. Robert A. Clark November 12, 1981 Page two We are willing to further discuss our analyses or forward any information necessary to support the bases for our conclusions.
Sincerely, Y
_c' Bart D. Withers Vice President Nuclear Attachment c:
Mr. Lynn Fra:ik, Director State of Oregon Department of Energy
At tachment Amendment 57 Safety Evaluation Report Test Criteria
_,, n 1.
Ensure that this loading would not cause spurious operation of the undervoltage relays and load-shedding devices.
A computer study (see attached tabulation) performed by Parsons Peebles-Electric Products Inc. shows that the maximun estimated voltage dip due to starting the motor-driven AFW pump is less than 24 percent, with the voltage significantly recovered within O.5 seconds. Although this study assumes a constant frequency -it is not expected that actual test results would vary substantially due to the short recovery period. This voltage dip would not af fect the undervoltage relays since they operate when voltage falls to 60 percent of full value. af ter a 1-second time delay. The degraded grid relays would not be affected since they are set at 92.5 percent of full voltage, with a 55-second time delay.
2.
Determine that this loading will not exceed the annual continuous rating of the diesel generator or its transient loading capabilities.
The starting load of the motor-driven AFW pump is 6211 kVA. The con-tinuous full load is about 933 kW.
The annual continuous rating of an emergency diesel generator is 4418_kW or 5500 kVA, and the 30-minute rating is 5003 kW or 6254 kVA. As can be seen, the starting load due to the motor-driven AFW pump is less than the 30-minute rating of the diesel generator, and the continuous full load of this machine is less than 25 percera of the diesel generator's continuous capacity.
Based on this, such a loading would not exceed the annual continuous rating of the diesel generator or its transient capabilities.
3.
Establish a margin between the motor-driven auxiliary feedwater pump loading and the continuous full load rating of the diesel generator.
The continuous full load rating of an emergency diesel generator is 4418 kW and the motor-driven AFW pump requires 933 kW, which estab-lishes a margin of 3485 kW.
4.
Determine what selected loads may be subsequently applied to the diesel generator af ter the motor-driven auxiliary feedwater pump has started without exceeding its steady state and/or transient loading capabilities.
With an established margin of 3485 kW for continuous full load capability, the diesel generator can still assume its maximum expected total demand of 3364 kW for a loss of preferred power with a safety injection signal (attached FSAR Table 8.3-4).
If safety injection is not ' activated, then this load is reduced to 1816 kW (attached FSAR Table 8.3-5).
If an emergency diesel generator is carrying the loss of preferred power with safety injection load of 3364 kW and the motor-driven AFW pump, there is still an adequate margin between this total load and the annual continuour rating.
i
2 5.
Verify that failure of the non-Class 1E motor-driven auxiliary feedwater pump will not cause damage to any connected Class 1E equipment.
If the motor-driven AFW pump should require starting, all loads will be first removed from the electrical bus.
After the pump has been successfully started and is running normally, additional loads can be transferred back to the bus.
By this method, optimum reliability will be assured.
6.
Verify that operating procedures and restrictions have been imple-mented to ensure that operating this pump with power from the Class lE bus is only used as a last line of defense and under direct super-vision of the Shift Supervisor.
Plant Operating Instructions 5-1, Diesel Generators and Fuel, and 8-2, Auxiliary Feedwater, include a precaution that prevents starting the motor-driven AFW pump with the emergency diesel generator.
In addition, a procedure will be developed for starting the motor-driven AFW pump with an emergency diesel generator in an emergency sa e2ation.
This procedure is intended only as a last chance method in ths ' vent that no other optiots are available and will never be used in a nonemergency situation.
ELD /4sh7.1A9
.m. 3 0.0 0.0 6650.0000 0.1600 So. /7/ofw( my_
.t ESTIMATED ESTIMATED c
IlliE_DE_HAL MAXJOLTAGF O
VOLTAGE DIP DIP y
0.1167 0.238262 l*j TIME VOLTAGE DIP POTIER VOLTAGE SATURATION SEC.
P.U.
P.U.
P.U.
- l 0.0140 0.200909 0.88930L-O.11080 0.0250 0.209693 0.88012 0.10151 0.0340 0.215738 0.87513 0.09661 t
.0.0440 __.__.0.221375.
__. 0.86908 0.09166 l' '
O.0530 0.225568 0.86458 0.08809 0.0610 0.228658 0.86129 0.08573 o 0685 6.23105^
o-85875 0.08392 "l
0.0735 0.232405 0.85733 0.08291 0.0795 0.233776 0.85590 0.08190 o 0860 0-23497M o.8548' O.08113
'*l 0.0920 0.235836 0.85390 0.08049 "j
0.0985 0.236;17 0.85318 0.07997 o.1050.
o-236954 0.B522A 0.47946 O.1100 0.237139 0.85257 0.07954 lj 0.1152 0.237194 0.85252 0.07951 0.1209 0=232124 0.85260-O.07957 P';
0.1252 0.236940 0.85282 0.07972
{*'l 0.1305 0.236631 0.85317 0.07997 o 1360 O_.23618n
. o 85367 O 43032 25; 0.1412 0.235658 0.85427 0.08074 f '., _.0.14 7 0 0.234963 0.85509 0.08132 p2' 0.1530 0 234119_
0.85604 0.08200 0.1590 0.233162 0.85721 0.08283 2'i 0.1655 0.232005 0.85853 0.08377 0.171 =;
a 67n81M o=B590M O_08471 2'l 0.1765 0.229788 0.86104 0.08555
'8 0.1815 0.228682 0.86229 0.08644 0 1A25 0.227979 o 86387 0 08756 2'
O.1955 0.225295 0.86639 0.08952 0.2035 0.223190 0.86873 0.09141 "I
o 2135 0 990AoT o _ n2L97 0.09371---- -
4'I 0.2255 0.216864 0.87660 0.09805 d
0.2815 0.198441.
0.89503 0.11841 2$
o 3135 0.lB20p1 n-90857 OJ 3326 0.3455 0.175500 0.92147 0.15170 f'
O.3935 0.158598 0.94036 0.18855 6.A255 6.142523 0.95274 0.21390 l"j 0.4575 0.136850 0.96466 0.24180 0.4895 0.126958 0.97572 0.27596 eI" 0.5215 0_t173A?
o,98644
_ 0.30899 "l
0.5535 0.108067 0.99683 0.34085
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0.5855 0.099131 1.00682 0.37218 4
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0.6335 o.08707A 1.02029 0.42512 O.6655 0.079455 1.02881 0.45903 0.7135 0.060576
- 1. 0. T97 0.50744 5'j 1
0.7695 _
o.057094 1 O' 0.56418 O.8175 0.048563 1.0 0.61554 f'
O.8815 0.018055
- 1. 0' O.67957 t'_
0.9455
__. O.028379.
- 1. 0L. -
- 0. 73853--
1.0095 0.019651 1.09565 0.79441 e
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TABLE 8.3-4 m 2-R$
DIESEL LOADING SEQUENCE n a g g.
FOR gg LOSS OF PREFERRED POWER WITH SIS SIGNAL
-$U u
Time Max Output from Acceler-Motor Required from Diesel ation Name-Motor Motor Each Diesel Start Start Time Plate Service Efficiency Generator Service Sequence (sec)
(sec) hn Factor
(%)
(kW)
("
Miscellaneous loads 1
10.0 2.0 300 80 280 Charging pump (centrifugal) 2 12.0 4.5 600 1.15 94.3 530 Safety injection pump 3
16.5 4.5 400 1.15 92.7 370 Containment spray pump 4
21.0 4.5 500 1.15 93.5 459 Residual heat reuoval pump 5
25.5 4.5 400 1.15 93.5 367 Component cooling water pump 6
30.0 4.5 500 1.15 95.0 452 Service water pump 7
34.5 4.5 500 1.15 93.2 460 Service water booster pumps 7
34.5 4.5 100 1.15 91.5 94 h,!
Containment air coolers 8
39.0 10.0 375 1.15 91.5 352 C3 TOTAL 3364 (3) Miscellaneous loads include emergency lighting, battery chargers, ventilation fans, spray and injection system motor-operated valves.
TABLE 8.3-5 DIESEL LOADING SEQUENCE FOR LOSS OF PREFERRED POWER WIT 110UT SIS SIGNAL Time Max Dutput from Acceler-Motcr Required from Diesel ation Name-Motor Motor Each Diesel Start Start Time Plate Service Efficiency.
Generator Service Sequence (sec)
(sec) h y_,
Factor
(%)
(kW)
Miscellaneous loads
- 1 10.0' 2.0 300 80 280 Charging pump (centrifugal) 2 12.0 4.5 600 1.15 94.3 530 Component cooling water pump 3
16.5 4.5 500 1.15 95.0 452 Service water pump 4
21.0 4.5 500 1.15 93.2 460 Service water booster pumps 4
21.0 4.5 100 1.15 91.5 94
. TOTAL 1816 (a) Miscellaneous loads include emergency lighting, battery chargers, ventilation fans, spray and injection system motor-operated valves. -
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