Kinetics Calculations for RIA Experiments in the Power Burst Facility
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
TThe Reactivity Initiated Accident (RIA) test series is being conducted in the Power Burst Facility (PBF) to provide information on nuclear fuel rod behavior during postulated accidents involving sudden rapid transients in power reactors. During a typical RIA experiment the PBF is operated in the "natural burst" mode, exposing one or more commercial-type fuel rods located in the central experiment space to a large, rapid and nearly adiabatic deposition of fission energy. This prompt energy deposition is followed by an extended (several-minute) period of delayed energy deposition caused by the release of delayed neutrons into the subcritical PBF core after the control rods are inserted to tenninate the transient. The delayed component of the deposited energy can be as much as 15-25% of the total. Some of the techniques used to measure energy deposition in the test fuel during RIA experiments do not distinguish between the prompt and delayed components. Others do not, for various reasons, give reliable results for the delayed component. Accordingly, reactor physics calculations have been completed to compute the delayed fraction of both the total fissions and the total energy deposition in the test fuel rods for five RIA experiments conducted in the recent past. The calculated delayed fractions should be useful in correctly interpreting results obtained from the various measurements of the energy deposited in the test fuel during each RIA experiment.
- Research Organization:
- Idaho National Laboratory, Idaho Falls, ID (United States); Idaho National Engineering Laboratory (INEL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 1462032
- Report Number(s):
- EGG-PHYS--5042; INL/EXT-17-43977
- Country of Publication:
- United States
- Language:
- English
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