This gas plenum is used to capture the fission products which are gasses such that the fuelpin does not over-pressurise.
这个气体空间曾用来获取裂变，气体生成物，这样，燃料大头针，就不会被过度增压。
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And clearly, many different types of fuel assemblies, as you will see a BWR and PWR fuel assemblies are different and all heat that is generated in that one fuelpin needs to be removed.