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The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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What is involved in radiation protection at accelerator facilities?
Particle accelerators have evolved from exotic machines probing hadron interactions to understand the fundamentals of our world to widely used instruments in research and for medical and industrial use. For research purposes, high-power machines are employed, often producing secondary particle beams through primary beam interaction with a target material involving many meters of shielding. The charged beam interacts with the surrounding structures, producing both prompt radiation and secondary radiation from activated materials. After beam termination, some parts of the facility remain radioactive and potentially can become radiation hazards over time. Radiation protection for accelerator facilities involves a range of actions for operation within safe boundaries (an accelerator safety envelope). Each facility establishes fundamental safety principles, requirements, and measures to control radiation exposure to people and the release of radioactive material in the environment.
Thursday, November 11, 2021|12:40–2:40PM EST
Michelle Bensi (Univ Maryland)
Carol S. Smidts (OSU)
Our fundamental understanding of both external hazards and nuclear power plant (NPP) responses to those hazards has increased in recent years as a result of the expanded use of external hazard probabilistic risk assessment (XHPRA). In parallel, recent operating experience has led to an increased understanding of and appreciation for the ways that external hazard events can affect NPP structures, systems, and components (SSCs) as well as the factors influencing human performance during hazard events.
While XHPRA knowledge and experience continue to grow, it remains challenging to represent the spatially and temporally dynamic nature of certain external hazard events within existing PRA modeling tools. Moreover, there is notable variability between hazard groups (e.g., flooding, seismic, and high wind hazards) with respect to the conventions of practice in XHPRA. These differences arise due to the differing XHPRA experience bases across hazard groups as well as fundamental differences in the nature of hazard events and the strategies plants use to respond.
As a result, broad uncertainties associated with XHPRA remain. These include uncertainties related to: (1) characterization of the severity and frequency of hazard events; (2) the physical impacts of hazard events on NPP SSCs; (3) event progressions; and (4) the impacts of external hazards on human performance (including FLEX strategies). Further, external hazards can create unique challenges related to site access, evacuation/sheltering, and concurrent/secondary/induced hazards.
In existing XHPRA practice, the aforementioned uncertainties and knowledge gaps have typically been addressed via conservative assessments, expert judgment, or simplified models and assumptions. Improvements in model realism can yield important risk insights through the enhancement of plant response procedures. They can also help to expand the utility of XHPRA to assist in evaluating alternative response strategies.
There is a need for a risk-informed strategy to identify, characterize, and prioritize drivers of hazard uncertainty. To address this challenge, this panel session will bring together experts in multiple aspects of XHPRA to discuss:
• These drivers of uncertainty in XHPRA
• Differences in practice (and origins of those differences) among hazard groups
• Future directions and potential benefits of efforts to improve model realism and reduce uncertainties
To access the session recording, you must be logged in and registered for the meeting.
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