ML20040E091
| ML20040E091 | |
| Person / Time | |
|---|---|
| Issue date: | 02/02/1982 |
| From: | Stello V NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Dircks W NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| References | |
| TAC-48281, NUDOCS 8202030102 | |
| Download: ML20040E091 (1) | |
Text
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EMORANDUM FOR: William J. Dircks NDJIVED Executive Director for Operations
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Victor Stello, Jr.
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Deputy Executive Director 9
f Regional Operations and Generic Requirements A4'/Tg i W
SUBJECT:
EMERGENCY Pl.ANNING ZONE PRACTICES -
5-AND.10 MILE DISTANCES FROM REACTORS You recently asked that I look into the rationale and technical bases supporting the current practices of requiring fast alerting and response systems within 10 miles from a plant site. I have done so with the help of ny staff and various RES, NRR and IE representatives.
I have con-cluded that the current practices of installing fast-alert systems.such as sirens substantially beyond 5 miles from the plant site are not warranted by the technical infornation at hand. An effective communica-tion network from about 5 to 10 miles should suffice and should not mandate the use of sfrens as part of the planning to avoid very inprobable life-threatening expusure levels.
If we consider the probable negnitudes of reduction in source term for those nere severe accidents within the core melt spectrum, the use of fast-alert systems such as sirens at distances less than 5 miles (e.g.,
2 or 3 miles) could be appropriate; however, this is looking ahead with some judgments on likely research outcomes for source-terin reduction.
I recomend that the current practices of requiring utilities to install fast-alert systems, such as sirens, beyond about 5 miles be reconsidered.
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