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首页> 外文会议>Waste management 2004 symposium (WM'04): waste management, energy security and a clean environment >BELGIAN SUPERCONTAINER LONG-TERM CRITICALITY CALCULATIONS
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BELGIAN SUPERCONTAINER LONG-TERM CRITICALITY CALCULATIONS

机译：比利时超容器长期临界计算

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We present a criticality risk assessment for one of the latest repository designs for spent nuclear fuel assemblies in Belgium.The supercontainer design consists in a 2-meter diameter cylindrical concrete container with a stainless steel liner holding four single spent fuel assembly canisters. The repository design foresees these supercontainers to be put in horizontal disposal galleries excavated in the Boom Clay at the reference site on the Mol/Dessel nuclear zone,near the SCK?CEN nuclear research center in Mol,Belgium. rnWe describe the techniques used to develop scenarios leading to criticality events,along with their application to the supercontainer case.We only consider in-package criticality scenarios. These are developed by using two different techniques:the bottom-up and the top-down approaches.The bottom-up approach consists in selecting and combining disruptive events in order to form scenarios.The top-down approach is based on the different states in which each component of the repository may be in the future.The scenarios are derived by taking combinations of the possible states of the different elements of the repository system. rnWe finally use the MCNP code in order to estimate the multiplication factor of the supercontainer system in several disrupted geometries and conditions.These geometries and conditions are directly derived from the scenarios development procedure.Different types of fuels and burn-ups have been studied.The major parameter has been found to be the moderation between the fuel rods of the fuel assemblies.In conclusion,we may say that the risks of an in- package criticality event in the supercontainer design appear to be extremely low.
机译：我们为比利时的一种用于乏核燃料组件的最新储存库设计提供了临界风险评估。超级容器设计包括一个直径为2米的圆柱形混凝土容器，其不锈钢衬里装有四个单个乏燃料组件罐。储存库的设计预见到这些超级容器将被放置在位于比利时摩尔（Mol / Dessel）核研究中心附近的摩尔/德塞尔核区参考点的动臂粘土中开挖的水平处置库中。我们描述了用于开发导致关键事件的场景的技术，以及它们在超容器情况下的应用。我们仅考虑包装内的关键场景。这些是通过使用两种不同的技术开发的：自下而上和自上而下的方法。自下而上的方法包括选择和组合破坏性事件以形成场景。自上而下的方法基于状态中的不同状态通过将存储库系统不同元素的可能状态组合起来，得出方案。 rn我们最终使用MCNP代码来估计超级容器系统在几种破坏的几何形状和条件下的乘积因子，这些几何形状和条件是直接从情景开发过程中得出的，研究了不同类型的燃料和燃尽物。已经发现，主要参数是燃料组件的燃料棒之间的节制。总之，我们可以说，超级容器设计中发生包装内临界事件的风险似乎非常低。

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