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Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
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.
Ziya Akcasu
Nuclear Science and Engineering | Volume 3 | Number 4 | April 1958 | Pages 456-467
Technical Paper | doi.org/10.13182/NSE58-A25482
Articles are hosted by Taylor and Francis Online.
Kinetic equations without the thermal feedback are integrated for an arbitrary reactivity variation, assuming that the magnitude of the changes in the excess reactivity is less than one dollar. First and second approximations are obtained. The results are applied to the step, ramp, and periodical reactivity changes. It is found that the logarithm of the flux, in the first approximation, is given by the function which is the solution of the linearized kinetic equations for the flux. Hence, the usual transfer function approach can be used to form the first approximate solution of the nonlinear kinetic equations. The wave form of the flux is obtained for a sinusoidal input, and the second harmonic is calculated. The exponential rise in the average value, as well as in the amplitude, of the oscillations of the flux is given for an alternative reactivity input. The gain of the reactor is defined. It is shown that the relative gain of the reactor decreases slightly with the increasing amplitude of the sinusoidal input. The results are compared to a numerical solution obtained by AVIDAC.