U.S. Reactor Containment Technology: a Compilation of Current Practice in Analysis, Design, Construction, Test, and Operation, Volume 1 Page: 1-07
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revised. The last revision incorporated many of the comments, and the
published document has been designated a guide for an interim period until
enough experience can be accumulated with reactors to permit the writing
of more definite standards.
The approved site guides differ from their immediate predecessors
in several significant points. A predominant point of objection was the
inclusion of a sample calculation of environmental and distance charac-
teristics as an appendix to the proposed guides on the grounds that (1)
the definite numerical values used in the sample calculation gave an aspect
of undue rigidity to the guides and (2) the example tended to overemphasize
the concept of environmental isolation. This objection was resolved not
only by deleting the sample calculation from the guide and placing it in
a separate document4 but also by identifying the criteria as interim mea-
sures and by stating that the "applicants are free and indeed encouraged
to demonstrate to the Commission the applicability and significance of
considerations other than those set forth in the guides."
Other changes in the criteria were incorporated in an attempt to
clarify the intent of the Commission on specific subjects and to cover
additional points that were raised by the comments. Thus some further
clarification is now included on the following issues: (1) multiple re-
actors at one site, (2) dependence upon isolation versus engineered safety
features, (3) applicability to mobile reactors, (4) effect of population
growth, and (5) population-center-distance concept, as follows:
1. The siting criteria for multiple reactors at one site may be
determined on the basis of the evaluation of individual reactors if the
reactors are independent to the extent that an accident in one does not
result in a simultaneous accident or otherwise adversely affect the safety
of operation of adjacent reactors.
2. The revised guides still reflect the Commission's emphasis on
isolation, although the phraseology has been modified to indicate a po-
tential willingness to accept demonstrably reliable engineered safety
features on proven plants in lieu of isolation.
3. Although the general safety concepts that are embodied in these
criteria may be expected to be applicable to all power reactors, these
guides were not meant to be directly applicable to other than stationary
4. Potential future population growth in the vicinity of a reactor
is considered in its hazards evaluation and it is anticipated that each
nuclear installation will acquire sufficient experience with engineered
safeguards to make it possible to rely on such factors, rather than isola-
tion, as the surrounding population increases.
5. The population-center-distance concept, although not entirely
satisfactory, provides an insight into current siting practice and phi-
losophy. It was said to be retained in lieu of any better technique of
both (a) limiting the total population exposure and (b) providing pro-
tection against excessive exposure doses to people in large centers
where protective measures may not be feasible. The man-roentgen equiva-
lent man (rem) concept suggested both in Nuclear Safety'0 and by the
Advisory Committee on Reactor Safeguards is a direct means of specify-
ing population exposure and has been given consideration for inclusion
in the siting guide.
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Cottrell, William B. & Savolainen, A. W. U.S. Reactor Containment Technology: a Compilation of Current Practice in Analysis, Design, Construction, Test, and Operation, Volume 1, report, August 1965; Oak Ridge, Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc101033/m1/35/: accessed March 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.