U.S. Reactor Containment Technology: a Compilation of Current Practice in Analysis, Design, Construction, Test, and Operation, Volume 1 Page: 1-17
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188.8.131.52 Essential Features of Ship Site Criteria
One of the most important developments was the adaptation of a cri-
terion for total population exposure in lieu of the city distance stipu-
lation in the existing guide.1 As an interim measure, a criterion of a
permissible exposure dose of 2,000,000 man-rem was established, as had
previously been proposed.19 This exposure is in addition to the individual
exposure limit of 25-rem whole body (and 300-rem thyroid) that is employed
for calculating various defined zones around the ship berth site in a
manner similar to the zones around a stationary reactor site.
Other unique features of the ship site criteria involve the removal
of the vessel after an accident (as a means of limiting the total popula-
tion exposure), the manipulation of the ship's reactor power history to
match the capability of the berth to provide adequate exclusion distances
for a given fission-product inventory, and provisions for the exposure
potential during the time the ship is entering and leaving a port. Since
ship mobility is accepted as a safety factor upon which port safety evalu-
ations are based, if the potential mobility were lost for some reason
(e.g., adverse weather), consideration would have to be given to shutting
down the reactor and possibly, also, depressurization of an appropriate
The guide"8 developed for mobile reactors, such as the N.S. Savannah,
established three zones that vary in distance from the reactor, as follows:
"1. Controlled Zone - that area in which all persons are
under the direct control of ship's personnel so that in the
event of an accident evacuation could be effected within two
hours without any person receiving more than 25 rem whole body
or 300 rem thyroid, and any individual general public member
standing at its outer boundary for two hours would not receive
an exposure exceeding 25 rem whole body or 300 rem thyroid.
"2. Low Population Zone - that area in which it is reason-
able to expect that, in the event of an accident, total evacu-
ation or protective measures could be carried out in a graded
fashion within 24 hours so that no person would receive more
than 25 rem whole body or 300 rem thyroid; and any member of
the general public standing at its outer boundary for 24 hours
would not receive an exposure exceeding 25 rem whole body or
300 rem thyroid.
"3. Dense Population Zone - that area which is immedi-
ately adjacent to the outer boundary of the low population
zone and cannot be evacuated, controlled, or protected.
"It can be seen that the establishment of these zones
is not only a function of the fixed port environment, but also
a function of the potential reactor accident. If the port
environment remains fixed, the reactor's potential maximum
accident can be adjusted. Therefore, the basic requirement
for suitability for any berth is that the reactor accident
potential be adjusted by controlled reactor power history so
that the zone boundaries for exposure limitation are equal to
or less than those boundaries established on population con-
trol or ship mobility.
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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/m1/45/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.