ML20002E312
| ML20002E312 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 01/20/1981 |
| From: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-02, TASK-8-2, TASK-RR FYR-81-19, FYR-811-9, NUDOCS 8101270362 | |
| Download: ML20002E312 (2) | |
Text
l 4
YANKEE ATOMIC ELECTRIC COMPANY c.
Ya luxse -
1671 Worcester Road, fromungham, Massachusetts 01701 4
2c22 FYP. 81-9
~,_
January 20, 1981 United States Nuclear Regulatory Commission Wash ingt on, D. C.
20555 Attention:
Dennis M. Crutchfield, Chief Operating Eeactors Branch #5 Oivf.sion of Licensing Eeferences:
(1)
License No. DPR-3 (Docket No. 50-29)
(2)
USNEC Letter to Y AEC, dated September 15, 1980
Subject:
SEP Topic VIII-2 Diesel Generators
Dear Sir:
We have reviewed the NEC preparec evaluation of Syster.atic Evaluatior.
Program Topic VIII-2, Diesel Generators. Our as-built facility differs fror.
the licensing basis assumec in your assessment as follows:
(1) Section 3 0 state.c that the worst case loading for each diesel generator is icentical. This is not true.
Emergency MCC-1 and Emergency MCC-2 cannot be connected to diesel generator 2:
therefore, the loacing of diesel generator 2 is less than the other diesels.
(2) Section 31 states that the automatically sequenced load en each diesel generator is 492.15 kVA.
Using motor nameplate currents we calculate the automatically sequenced load as 418.5 kVA.
Using maximum brake horsepower requirements of the load and assuming 0.95 efficiency the load equals 37 ; kW.
(3) Section 3 1 states that Emergency MCC-1 represents a measured normal operating load of 31.46 kVA and Emergency MCC-2 represents a measured normal operating load of 14 33 kVA. We are unable to determine the source of this information and, therefore, conclude that it is inaccurate. We calculate the load on Emergency MCC-1 as 32.5 kVA or 26 kW and the load on Emergency MCC-2 as 25 3 kVA or 20.2 kW (0.8 power f actor assumed).
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United States Nuclear Regulatory Commission January 20, 1980 Attn:
Mr. Dennis M. Crutchfield, Cnief Page 2 Operating Reactors Branch 5 (4) Section 31 states that "the total automatically connected lead, which is 108% of the continuous rating, exceeds the RG 1.9 diesel generator loading limit".
We would like to point out that EG 19 specifies that the predicted load should not exceed the short-time rating of the diesel generator. Therefore, this RG has been inappropriately applied to continuous rating of the Yankee Rowe diesel generator.
In addition. Section 31 states that the worst case automatically connected load is at least 537 94 kVA at 0.8 pr.
We calculate the worst case load from above as 476 kVA or 419.2 r:W.
Tnis load exceeds the continuous power rating of the diesel unit by 55.
This load is applicable only to diesels 1 and 3 The worst case load for diesel 2 equals 418.5 kVA or 373 kW.
(5)
Section 3 2 states that the only diesel generator protective trip is overspeed.
Additional trips are provided.
They include:
(a) diesel generator circuit breaker overcurrent trip (b) reverse power protection (trips circuit breaker)
The above trips are not bypassed under emergency conditions.
We trust that the above information will be incorporated in your evaluation of SEP Topic 7III-2, Diesel Generators for Yankee Rowe.
If you have any further questions, please let us know.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY J. A. Kay Senior Engineer - Licensing