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Conference Spotlight
2026 Annual Conference
May 31–June 3, 2026
Denver, CO|Sheraton Denver
Standards Program
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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Latest News
Seconds Matter: Rethinking Nuclear Facility Security for the Modern Threat Landscape
In today’s rapidly evolving threat environment, nuclear facilities must prioritize speed and precision in their security responses—because in critical moments, every second counts. An early warning system serves as a vital layer of defense, enabling real-time detection of potential intrusions or anomalies before they escalate into full-blown incidents. By providing immediate alerts and actionable intelligence, these systems empower security personnel to respond decisively, minimizing risk to infrastructure, personnel, and the public. The ability to anticipate and intercept threats at the earliest possible stage not only enhances operational resilience but also reinforces public trust in the safety of nuclear operations. Investing in such proactive technologies is no longer optional—it’s essential for modern nuclear security.
Abd El Rahman Mahmoud, Aya Diab
Nuclear Science and Engineering | Volume 196 | Number 3 | March 2022 | Pages 342-361
Technical Note | doi.org/10.1080/00295639.2021.1975479
Articles are hosted by Taylor and Francis Online.
The power manuverability of nuclear power plants (NPPs) is becoming more and more important as governments expand the deployment of renewable energy resources in their energy mix. For this purpose, load follow (LF) operation (LFO) schemes are introduced and tested for different types of reactors. Currently, all NPPs in Korea are operated at a baseload, that is, 100% rated power, and do not rely largely on power tracking control except for startup, shutdown, and some anticipated transients without scram. However, as the contribution of NPPs in the total electricity generation exceeds 50%, LFO may be necessary to balance the intermittency of renewable energy resources. However, the execution of LF can be challenging due to the complex interaction of the nuclear system parameters. Therefore, MODE-K was proposed to investigate the feasibility of LFO for OPR1000 and APR1400. Although MODE-K has shown good results in controlling reactor power and core reactivity, analysis has focused on neutronics aspects only and neglected plant response. A multiphysics LF simulation is therefore undertaken in this work using the multiphysics package RELAP5/SCDAPSIM/MOD3.4/3DKIN to accurately represent the impact of the underlying feedback mechanisms on APR1400 system performance. The simulation uses the three-dimensional neutron kinetics module (3DKIN) to model the reactor core by defining up to eight different control rod banks. Compared to the point-kinetics model of the Reactor Excursion and Leak Analysis Program (RELAP5), the use of 3DKIN yields a more realistic simulation by representing the entire core and reflecting the control rod motion in real time without assumptions related to the axial and radial power distributions, or burnup state.
