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Criticality safety of low-density storage arrays
| 题名： | Criticality safety of low-density storage arrays |
| 作者： | Bauer, T.H.; |
| 关键词： | 05 NUCLEAR FUELS ; FISSIONABLE MATERIALS; STORAGE; CRITICALITY; STORAGE FACILITIES; SAFETY ANALYSIS; PLUTONIUM 239; SELF-SHIELDING; MODERATORS; CALCULATION METHODS; MULTIPLICATION FACTORS |
| 摘要： | This note proposes a straightforward and simple method for the criticality safety analysis of fissionable materials configured into large arrays of standard containers. While criticality-safe storage limits have been well-established for standard containers--even under flooded conditions, it is also necessary to rule out the potential for criticality arising from neutronic interactions among multiple containers that might build up over long distances in a large array. Traditionally, the array problem has been approached by individual Monte Carlo analyses of explicit arrangements of single units and their surroundings. Here, the authors show how multiple Monte Carlo analyses can be usefully combined for wide-ranging general application. The technique takes advantage of low average density of fissionable material in typical storage arrays to separate neutron interactions that take place in the neutron`s``birth unit`` from subsequent interactions in a highly dilute array. Effects of array size, in particular, are conservatively calculated by straightforward analyses which simply smear array contents uniformly across the extent of the array. For given unit loadings in standard containers, practical expressions for neutron multiplication depend only on overall array shape, size and reflective boundary. |
| 总页数： | 6p |
| 报告类型： | 科技报告 |
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