2021年课题4.1的研究目标为开展准则相关试验流程及评价方法研究，以高安全性高燃耗燃料元件应用为目标，一方面考虑对高燃耗高安全性燃料元件不适用的设计准则和安全准则，另一方面论证考虑新型燃料元件的特有性能是否需要另外建立新的设计准则和安全准则，综上全面考虑准则涉及的燃料和包壳行为，论证这些燃料元件的行为应开展的堆外试验、堆内试验以及辐照后试验，建立一套完整的准则的评价流程和试验评价方法。

The research objective of Subject 4.1 in 2021 is to carry out the research on the test process and evaluation method related to the criteria, aiming at the application of high safety and high burnup fuel elements. On the one hand, the design criteria and safety criteria that are not applicable to high burnup and high safety fuel elements are considered. Arguments on the other hand considers the specific performance of the new type fuel element need to build another new design standards and safety norms and standards relating to comprehensive consideration in fuel and cladding, demonstrate the behavior of the fuel element should be carried out outside the heap of test, in pile test and test after irradiation, establish a complete set of criteria of evaluation process and the test evaluation method.