ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
Meeting Spotlight
2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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
New laws offer nuclear industry incentives for existing power plant uprates
This year, the U.S. nuclear industry received a much-needed economic boost that could help preserve operating nuclear power plants and incentivize upgrades that extend their lifespan and power output.
Signed into law in 2022, the Inflation Reduction Act offers production tax credits (PTCs) for existing nuclear power plants and either PTCs or investment tax credits (ITCs) for new carbon-free generation. These credits could make power uprates—increasing the maximum power level at which a commercial plant may operate—a much more appealing option for utilities.
Taro Ueki
Nuclear Science and Engineering | Volume 157 | Number 2 | October 2007 | Pages 119-131
Technical Paper | doi.org/10.13182/NSE07-A2717
Articles are hosted by Taylor and Francis Online.
A variance reduction method has been developed for the Monte Carlo calculation of electron emission energy profile induced by photon radiation. The spatial control of particle weight was exclusively investigated. It was derived that the photon weight in the electron range at an electron detection surface should be equal to the electron weight that is determined to be inversely proportional to the electron adjoint function. Therefore, the preliminary Monte Carlo calculation of the forward electron-only problem with the uniform electron source over the maximum electron range, maximum allowed energy, and all solid angles was conducted to create the photon and electron weight window. The photon weight window more than the maximum electron range away from the electron detection surface was made constant. Monte Carlo simulations of photon and electron coupled-transport were conducted for slab materials with photons normally incident on one side and the electron energy profile to be evaluated on the other side. Numerical results show that efficiency gain with respect to the simulation with no weight control is significant for slabs of typical low and high atomic number materials even if taking into account time spent on the preliminary Monte Carlo calculation of the electron adjoint function.