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Division Spotlight
Robotics & Remote Systems
The Mission of the Robotics and Remote Systems Division is to promote the development and application of immersive simulation, robotics, and remote systems for hazardous environments for the purpose of reducing hazardous exposure to individuals, reducing environmental hazards and reducing the cost of performing work.
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.
Charles T. Rombough, Hans Toffer, Ralph D. Crowe, Todd J. Samuel
Nuclear Science and Engineering | Volume 106 | Number 4 | December 1990 | Pages 489-493
Technical Note | doi.org/10.13182/NSE90-A23773
Articles are hosted by Taylor and Francis Online.
Measurements and analysis demonstrate that self-powered fixed in-core detectors can be used to reliably measure the spatial distribution of the gamma flux in a large nuclear reactor in the shutdown state. Measurements were made at the Hanford N Reactor, a large graphite-moderated dual-purpose nuclear reactor that has been equipped with a state-of-the-art fixed in-core detector system consisting of rhodium and hafnium self-powered detectors. Although the system was designed for neutron flux measurements at power, the detectors can be used to measure the gamma flux distribution in the reactor while the reactor is shut down. Except for some flux peaks caused by known radiation sources, the spatial distribution can be related to the fuel burnup surrounding each detector. Subsequent measurements were made after the fuel was removed and it was found that the gamma flux decreased by an amount that was predicted from the first measurement. These measurements demonstrate that well-designed self-powered fixed in-core detectors can be used to extract meaningful information at power levels much smaller than previously thought. A fixed in-core detector system, in conjunction with commercially available signal collection equipment, can be used to accurately and reliably measure neutron and gamma flux distributions in nuclear reactors at power levels on the order of 0.1%.