ML19241A852
| ML19241A852 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley, Surry, Maine Yankee, FitzPatrick  |
| Issue date: | 05/21/1979 |
| From: | Harold Denton Office of Nuclear Reactor Regulation |
| To: | Haggett W AFFILIATION NOT ASSIGNED |
| References | |
| NUDOCS 7907090460 | |
| Download: ML19241A852 (3) | |
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Mr. William E. Haggett, President Associated Industries of Maine 2 Central Plas Augusta, ME 04330
Dear Mr. Haggett:
This is in response to your telegram of March 16 to Secretary Schlesinger regarding the orders by the Nuclear Regulatory Commission on March 13, 1979, to shut down five nuclear power plants in the eastern United States because 1
of, questions about the ability of their piping systems to withstand earthquakes.
Shortly before those orders were issued, it became apparent to NRC staff that analysis techniques which had been used ira the seismic design of safety-related piping for these five plants were not in accord with i
proven and generally accepted engineering practice.
The result could be overstressing of piping and supports for earthquakes which could reasonably I
be expected to occur durinn the lifetimes of these plants.
The eastern l
United States is generally believed to be a region of low seismicity, when compared to the western part of the country, but is not without significant historical seismic activity.
Attached is a map showing the location and intensity of earthquakes that have occurred in your region.
Some of the piping systems involved could, if failure occurred, cause loss of coolant to the nuclear reactor In addition, systems needed to i
shut the plant dow" safely in that evem could also be affected.
- Thus, an earthquake of not extrer.ely low likelihood would have the potential for causing an accident and for preventing operation of safety systems l
designed to cope with the accident.
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Our objective is to review the situation in an expedited and disciplined manner so that these plants can Le returned to ope. rat.'on with assurance that this will not constitute a threat to the public health and safety.
Sincerely,
'h f
l Harold R. Denton, Director Office of Nuclear Reactor Re iiction
Enclosures:
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