These cans are designed so that they not only support the uranium inside, but also contain the highly radioactive fission products, and prevent reaction taking place between the fuel and the coolant.

• 设计这类容器或护罩时应使其不仅在内部能有效保护铀燃料，而且也可容纳放射性高的裂变产物，同时应能控制燃料和冷却剂间所发生的反应。