Evaluation of effective energy deposition in test fuel during power burst experiment in NSRR.

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概要

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• In an inpile experiment to study the fuel behavior under reactivity-initiated accident conditions, it is of great importance to understand the time-dependent characteristics of the energy deposited in the test fuel by burst power. The evaluation of the time-dependent energy deposition requires the knowledge of the fission rates and energy deposition per fission in the test fuel, both as a function of time. In the present work, the authors attempted to evaluate the relative fission rate change in the test fuel subjected to the power burst testing in the NSRR through the measurements and analyses of the fission power changes in the NSRR. Utilizing a micro fission chamber and a conventional larger fission chamber, they successfully measured the reactor fission power change ranging over a dozen of decades in magnitude and a thousand seconds in time. The measured power transient agreed quite well with calculated results. In addition, the time-dependent energy deposition per fission in the test fuel including the energy contribution from the driver core was analytically evaluated. The analyses indicate that the energy of about 175 MeV/ fission is promptly deposited in the test fuel and that the additional energy of about 11 MeV is deposited afterwards. Finally the fractions of energy deposited in the test fuel until various times after power burst were determined by coupling the time-dependent relative fiissions and energy deposition per fission in the test fuel. The prompt energy deposition ranges from about 50 to 80% of the total energy deposition for the reactivity insertion between 1.5 and 4.7 $, and the remaining is the delayed energy deposition.

• 一般社団法人 日本原子力学会の論文

著者

• OHNISHI Nobuaki

  Division of Reactor Safety, Japan Atomic Energy Research Institute

• OHNISHI Nobuaki

  Division of Reactor Safety, Tokai Research Establishment, Japan Atomic Energy Research Institute

• INABE Teruo

  Division of Reactor Safety, Japan Atomic Energy Research Institute

関連論文

• Measurement and evaluation on pulsing characteristics and experimental capability of NSRR.
• Evaluation of effective energy deposition in test fuel during power burst experiment in NSRR.

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