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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.
Tomomi Uchiyama
Nuclear Science and Engineering | Volume 133 | Number 1 | September 1999 | Pages 92-105
Technical Note | doi.org/10.13182/NSE99-A2075
Articles are hosted by Taylor and Francis Online.
Air-water two-phase flows around a rectangular cylinder located in vertical upward flows are analyzed by an incompressible two-fluid model using the two-dimensional upstream finite element method proposed earlier. The Reynolds number, based on the cross-stream width of the cylinder and the free-stream velocity of the liquid phase, is 2.0 x 104, and the volumetric fraction of the gas phase upstream of the cylinder g0 ranges from 0 to 0.075. Three kinds of cylinders with the thickness-to-width ratios D/B of 0.5, 1, and 1.5 are employed. The calculated flows exhibit unsteady behavior with the von Kármán vortices shedding from the cylinder into the wake at every g0 value. The volumetric fraction of the gas phase is higher in the wake and achieves maximum value at the center of the vortices, where the pressure reaches its minimum value. The flow field and the vortex-shedding frequency are greatly affected not only by the g0 value but also by the D/B ratio.
