[en] Licensing applications and requirements for an ideal steady-state fuel performance code are identified and characterized. Fifteen licensing applications are examined with respect to specific requirements as set forth in the Code of Federal Regulations, Nuclear Regulatory Guidelines and NRC Standard Review Plans. Code input data needs and output data requirements for each application and models necessary to represent the pertinent fuel behavioral phenomena are identified. Finally, an acceptable level of conservatism for each licensing application is established and guidelines for overall code accuracy are established. Overall code accuracy is discussed with respect to fuel temperature, fission gas release and internal rod pressure calculations