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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.
M. Dion, G. Marleau
Nuclear Science and Engineering | Volume 179 | Number 2 | February 2015 | Pages 186-198
Technical Paper | doi.org/10.13182/NSE13-90
Articles are hosted by Taylor and Francis Online.
A method is proposed to evaluate implicit sensitivity coefficients for several types of reactor lattices, including pressurized water reactors and CANDU (CANada Deuterium Uranium) reactors, with different resonant and light isotope contents. The implicit sensitivity of the multiplication factor, resulting from a variation of an isotope density through the self-shielded cross sections, is computed for different cases. The precision of the method, the importance of the implicit coefficients with respect to the total sensitivity, and the contributions of all the isotopes are discussed and compared for the different systems. We also show how to compute the sensitivity coefficients in the unresolved energy groups, where the details of the resonances are not known. An equivalent dilution model is used for the self-shielding calculations. Complete transport calculations, using a collision probability method, are also used to compute reference values for the implicit sensitivities.