| 摘要 |
A core plug for replacing a fuel assembly of a reactor with the plug being devoid of nuclear fuel and having a high flow resistance such as to permit only sufficient coolant flow through it for adequately cooling the plug. In the operation of the reactor, should a fuel assembly within the central region of the core become defective, this defective assembly will be removed and there will be a reshuffling of the fuel assemblies so as to produce an open assembly space at the outermost core region. There will then be placed in this space a core plug having the aforementioned flow characteristics.
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