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Fusion Science and Technology
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ANS hosts webinar on criticality safety standards
A diagram depicting the NRC’s regulatory structure for nuclear criticality safety. (Image: Oak Ridge National Laboratory)
The American Nuclear Society’s Risk-informed, Performance-based Principles and Policy Committee (RP3C) held another presentation in its monthly Community of Practice (CoP) series last month. RP3C chair Steven Krahn opened the meeting with brief introductory remarks about the importance of risk-informed, performance based (RIPB) decision-making and the need for new approaches to nuclear design that go beyond conventional and deterministic methods.
M. E. Abdel-Kader
Fusion Science and Technology | Volume 81 | Number 5 | July 2025 | Pages 471-484
Research Article | doi.org/10.1080/15361055.2024.2397619
Articles are hosted by Taylor and Francis Online.
The cascade discharge of the hollow plasma device is modeled using the snowplow model. In the model, one or three condenser banks discharge between the two electrodes, with a different time delay. The results were achieved with and without the hollow plasma’s multidischarge cascade. The cascade discharge aims to increase the plasma’s energy to keep the discharge current from breaking down and to keep the plasma column compressed for an extended period. Both the cascade and the single discharges affect the pinching time. The calculated induced magnetic field increases progressively until it reaches the pinch point, and then it decreases, at which point the total discharge current reaches a low value. The magnetic field distribution was calculated as a function of the plasma radius, both with and without the cascade discharge. The model demonstrates that, both with and without a cascade discharge, the magnetic field distribution is low at the tube’s exterior wall and increases toward the axis, reaching a maximum value of 138 kG in the case of a cascade discharge and 42.5 kG with a single discharge. A delay unit resembling the one found in a hollow plasma device is utilized to manually manage the electric circuit discharge simulation.