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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.
Nikolai Papmehl
Nuclear Science and Engineering | Volume 22 | Number 4 | August 1965 | Pages 451-454
Technical Paper | doi.org/10.13182/NSE65-A20631
Articles are hosted by Taylor and Francis Online.
Starting from the observation that exponentials of lethargy are just eigenfunctions of the elastic-scattering-energy transfer operator, a Fourier transform with respect to lethargy is applied to the energy-dependent Boltzmann equation. For constant cross sections and isotropic scattering in the center of mass system (but arbitrary anisotropy in the laboratory system) this leads to a ‘one-velocity’ transport equation with a complex number of secondaries. Hence, if the method of Case is now to be applied it has to be extended to cover this situation. For an infinite medium, however, the solution may readily be obtained by a Fourier transform with respect to the space coordinate. Thus, the exact result is a double Fourier inversion integral, which can be calculated numerically. It is shown that well-known solutions can be obtained by an approximate evaluation of this integral.
