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Developing a new regulatory framework for advanced reactors: Update on Part 53
White
The American Nuclear Society’s Risk-informed, Performance-based Principles and Policy Committee (RP3C) on March 29 held another presentation in its monthly Community of Practice (CoP) series. The presenter, Patrick White with the Nuclear Innovation Alliance (NIA), talked about the current status of efforts to develop a new regulatory framework for advanced reactors—known as 10 CFR Part 53 or simply Part 53. White serves as the research director of the NIA, where he leads their research as well as analysis-based stakeholder and policymaker engagement and education. White’s March 29 presentation is publicly available on YouTube and at ANS’s publication platform Nuclear Science and Technology Open Research (NSTOR).
RP3C chair N. Prasad Kadambi opened the CoP with brief introductory remarks about the RP3C before he welcomed White as the session’s presenter.
White covered three main topics: the history of the existing regulatory frameworks for new reactors, progress to date on the development of the Part 53 rule for advanced reactors, and the current status and next steps for the Part 53 rulemaking process.
Martina Kloos, Jörg Peschke
Nuclear Science and Engineering | Volume 153 | Number 2 | June 2006 | Pages 137-156
Technical Paper | doi.org/10.13182/NSE06-A2601
Articles are hosted by Taylor and Francis Online.
The MCDET method for probabilistic dynamics is a combination of Monte Carlo (MC) simulation and the Discrete Dynamic Event Tree (DDET) approach. The implementation of MCDET works in tandem with any appropriate deterministic dynamics code.MCDET was developed to achieve a more realistic modeling and analysis of complex system dynamics in the framework of probabilistic safety analyses. It is capable of accounting for aleatory (stochastic) uncertainties, which are the reason why the safety assessment is probabilistic, and for epistemic (state-of-knowledge) uncertainties, which determine the precision of the probabilistic assessment. In MCDET, discrete aleatory variables are generally treated by the DDET approach, whereas continuous aleatory variables are handled by MC simulation. For each set of values provided by the MC simulation, MCDET generates a new DDET.The paper gives a description of the MCDET method and an overview of the results that may be obtained from its application. The results presented were derived from an application of MCDET in combination with the deterministic dynamics code MELCOR for integrated severe accident simulation. For illustration purposes, the consequences in a German nuclear power plant after a station blackout were analyzed.