Welcome to FAST / FRAPCON / FRAPTRAN

What are FRAPCON and FRAPTRAN?

FRAPCON is the U.S. Nuclear Regulatory Commission’s (NRC’s) steady-state fuel performance code; it was developed and has been maintained by Pacific Northwest National Laboratory. 

FRAPCON provides the NRC with the ability to accurately calculate the high-burnup response of light-water reactor fuel rods. FRAPTRAN is the companion code to FRAPCON that calculates the response of light-water reactor fuel rods to rapid transients and severe accidents. The code has been assessed against a large database of steady-state and transient tests such that the code predictions are well validated and uncertainty in code predictions has been quantified. 

Use of FRAPCON and FRAPTRAN

FRAPCON and FRAPTRAN are used by the NRC as audit tools in the review and approval of vendor safety analysis codes and are being used by a large worldwide user group that includes: regulatory and safety bodies, research and engineering corporations, utilities, fuel vendors, and universities.