ML19323G939
| ML19323G939 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/04/1980 |
| From: | Groce R Maine Yankee |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| WMY-80-88, NUDOCS 8006090280 | |
| Download: ML19323G939 (1) | |
Text
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ENGINEERING OFFICE WESTBORO, MASSACHUSETTS 01581 617-366-9011
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United States Nuclear Regulatory Commission Washington, DC 20555 Attention: Office of Nuclear Reactor Regulation Division of Licensing Mr. Robert A. Clark, Chief Operating Reactors Branch #3
References:
(a) License No. DPR-36 (Docket No. 50-309)
(b) USNRC Letter to MYAPC, dated May 8, 1980 (c) USNRC Letter to MYAPC, dated November 27, 1979 (d) MYAPC Letter to USNRC (WMY 80-36), dated March 4, 1980
Subject:
Loss of Offsite Power Survey
Dear Sir:
Your letter, Reference (b), requested information regarding either complete or partial loss of offsite power events at our facility.
In our review of this request we have determined that a very similar, if not identical list of questions had been transmitted by your office in Reference (c). Unless directed otherwise, we are going to assume that you did not receive our initial response, Reference (d), and simply enclose another copy as an attachment to this cover letter.
We trust you will find this information satisfactory; however, should you require additional information please feel free to contact us.
Very truly yours, MAINE YANKEE ATOMIC POWER COMPANY
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Robert H. Groce Senior Engineer - Licensing RHG/ncj Enclosure 8 0080 a :.. 2 8d a
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ENGINEERING OFFICE WESTBORO, MASSACHUSETTS 01581 617-366-9011
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United States Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Office of Nuclear Reactor Regulation Operating Reactors Branch 44 Division of Operating Reactors
References:
(a)
License No. DPR-36 (Docket No. 50-309)
(b) USNRC Letter to MYAPC dated November 27, 1979 (c) MYAPC letter to USNRC WMY 79 14 dated March 2, 1979
Subject:
Loss of Offsite Power Survey
Dear Sir:
As requested in Reference (b), we are providing the following information.
We have reviewed Maine Yankee Plant experiences with the offsite power system and find no occurrences of complete or partial loss of offsite power during the eight years of plant operation (1972 to present).
Offsite power for the Maine Yankee Plant is supplied from a 115 kV switchyard adjacent to the plant. Tm 115 kV transmission lines, one from Upsyon Station and one from Suroweie Substation supply the 115 kV switchyard.
Both Mason Station and Suroweic Substation are extensively interconnected with the 115 kV and 345 kV transmission network in the New England area. Each station has a 345 kV/115 kV autcnnatic load tapchanging autotransformer which maintains station voltage at approximately 120 kV.
Transmission line interconnections are shom on Figure 1.
Upon loss of their normal power source, the station auxiliary buses are automatically transferred to reserve station service transformers X14 and X16. Transformers X14 and X16 supply power from the 115 kV switchyard to the 4160 volt and 6900 volt buses respectively. A one line diagram of the Maine Yankee auxiliary power system is attached as Figure 2.
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energized and offsite power i DUPLICATE DOCUMENT years of plant operation ther
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No. of pages:
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