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8. An array of packages must be subcritical. A number, “N” must be derived assuming that if packages were stacked together in any arrangement with the stack closely reflected on all sides by water 20 cm thick (or its equivalent) both of the following conditions would be satisfied—
(a)five times “N” undamaged packages without anything between the packages would be subcritical; and
(b)two times “N” damaged packages with hydrogenous moderation between packages to the extent which results in the greatest neutron multiplication would be subcritical and, in addition if any part of the fissile material escapes from the containment system: that material, from two times “N” damaged packages must be subcritical when arranged in—
(i)the configuration and moderation that results in maximum neutron multiplication; and
(ii)with close reflection of that material by water 20 cm thick (or equivalent).
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