ML19323F857

Reports Sustained full-load Operational Test of Emergency Diesel Generators Per IE Bulletin 79-23.Both Diesel Generators Were Successfully Tested Under Load for 22-h Each

ML19323F857
Person / Time
Site:	Maine Yankee
Issue date:	04/24/1980
From:	Groce R Maine Yankee
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-79-23, WMY-80-71, NUDOCS 8005290550
Download: ML19323F857 (2)

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ENGINEERING OFFICE WESTBORO, MASSACHUSETTS 01581 617-366-9011 "c.rd B.4.1.1 KMY 80-71 April 24, 1980 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention:

Mr. Boyce H. Grier, Director

References:

1) License No. DPR-36 (Docket No. 50-309)

2) USNRC Letter to MYAPC dated September 12, 1979 IE Bulletin No. 79-23

3) MYAPC Letter to USNRC dated October 29, 1979

Subject:

Sustained Full-Load Operation Test of Emergency Diesel Cenerators i

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Dear Sir:

l 1

As required by Reference (2), MYAPC has performed a sustained full-load operation test on each emergency diesel generator.

Reference (3) stated that you would be notified of the results upon completion of testing.

Emergency Diesel Generator DG-1A was tested from 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> on December 17, 1979 to 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> on December 18, 1979.

22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> were at a load approximately equal to the continuous rating of 2500 kW, and 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> were at l

the short time rating of 290J : J.

Review of the DG-1A test results indicate that during the 22 hour2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> test the actual load varied between 2420 kW and 2520 kW with an average load of 2468 kW.

This variation was apparently caused by fluctuations of power factor of station load during the testing and is not indicative of the diesel generator's capability to carry 2500 kW continuously. MYAPC believes that this test meets the requirements of IE Bulletin 79-23 by demonstrating the sustained load carrying capability of the emergency diesel generator.

Emergency Diesel Generator DG-1B was tested from 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> on December 23, 1979 to 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> on December 24, 1979.

DG-1B was operated for 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> at the continuous rating of 2500 kW and for two hours at the short time rating of 2900 kW.

In contrast to the test for DG-1A, the load for DG-1B equalled or exceeded the continuous rating throughout the 22 ho;.r test.

eeosao 69

'Mr. Boyce H. Grier, Director -

United States Nuclear Regulatory Commission April 24, 1980 Page 2 During the test of each diesel generator, voltage and frequency were i

maintained within limits and the cooling system functioned within design limits.

We trust that you will find this information satisfactory, however, should you desire additional information, please contact us.

Very truly yours, MAINE YANKEE ATOMIC POWER COMPANY d

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R. H. Croce Senior Engineer - Licensing PRJ/ dis i

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