ML19345G180
| ML19345G180 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/04/1973 |
| From: | Hartley F CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-73-03, AO-73-3, CYH-2347, NUDOCS 8103100238 | |
| Download: ML19345G180 (1) | |
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CONNECTICUT YANKEE ATOMIC POWER COMPANY HADDAM NECK PLANT RR = 1 BOX 127E. EAST H AMPTON, CONN. 06424 April 4,1973 CYH-2347
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U. S. Atomic Energy Conmission Washington, D. C. 20545 4
ATTENTION: Director, Directorate of Licensing b
REFERENCE:
Provisional License No. DPR-14 Docket No. 0-213 Abnormal Occurrence 73-3 N',
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Dear Sir:
%,8'. l'. v, As defined by Technical Specifications for Connecticut Yankee Atomic Power Station Section 5.3, the following incident that involved an unsatisfactory monthly test of emergency diesel generator 2B is hereby reported as Abnormal Occurrence 73-3.
In accordance with the plant technical specification the routine monthly operational test of 2B emergency diesel generator (EG-2B) was performed on March 26, 1973, beginning at approximately 0900. The purpose of this test is to demonstrate the ability of the diesel generators to start and deliver power up to the expected maximum emergency loading when operating in parallel with other power sources. The unit was started, phased and loaded to 2850 KW at 0900. At 0950 the auxiliary operator noted that the generator load indication was oscillating approximately 200 KW. The operator immediately reduced load approximately 300 KW at which tine the oscillations halted. Load was then inereased to 2850 KW and load oscillations dampened to approximately 25 KW, Subsegrnt investi-gation revealed a loose load gain potentiometer in the governor control unit for EG-2B, The potentiometer locking mechanism was tightened and the required test was satisfactorily completed, l
Loosening of the locking mechanism apparently occurred over a period of time and finally became sufficient to permit the governor to exceed normal oscillation.
It does not appear to present any I
l problem with future operation of the emergency generator; however, i
periodic checks of the locking mechanism will be made as part of l
the routine preventative maintenance program and observation for 4
increased oscillations will be made during normal testing.
It d
l not expected that this situation will reoccur.
fh Very tru y yours, APR10W3 r.-
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. W. Hart,
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Plant Superi tenderet ro r.c.c a rc
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cc: Mr. James P. O'Reilly, Director Region 1 Division of Compliance l
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