Abstract
This paper describes key aspects of the risk-informed, performance-based licensing methodology as developed by the Department of Energy (DOE) for the Next Generation Nuclear Plant (NGNP) project. The discussion focuses on an event selection process using modular high temperature gas-cooled reactor (HTGR) design attributes and identifies how top-level regulatory criteria can be placed on a frequency-consequence curve. Preliminary Nuclear Regulatory Commission (NRC) staff evaluations concluded that the proposed approach is generally reasonable and responsive to the Commission’s Policy Statement on advanced reactors. However, the NRC deferred issuing any final assessments of the proposed approach due to other agency actions that were under consideration in response to the accident at Fukushima-Daiichi. In addition, important lessons learned during the NGNP prelicensing effort and their potential applications to alternative advanced reactor designs are presented.
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