Improvement of cell model for control rod in reflector region of high temperature test engineering reactor

Yuki Honda, Nozomu Fujimoto, Sawahata Hiroaki, Sawa Kazuhiro

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

The High Temperature Engineering Test Reactor (HTTR) [1] is a block type fuel High Temperature Gas-cooled Reactor. There are 32 control rods (16 pairs) in the HTTR. The 6 pairs of control rods are inserted into a core region and the others are inserted in a reflector region surrounding the core. The core temperature of the HTTR is too high to insert all control rods simultaneously at reactor scram near full power operation for keeping integrity of control rods metallic sleeve. Therefore, a two-step control rods insertion method for reactor scram is adopted. The reactivity inserted at the two-step control rod insertion method was measured at HTTR criticality tests. The calculated reactivity at the firststep showed larger underestimation than that of the second-step. On the other hand, calculated results of excess reactivity at the HTTR criticality tests showed good agree with tests. It is considered that a cell model for reflector region control rod is not suitable. Therefore, this paper focuses on a new cell model for control rods in a reflector region. In a previous control rod cell model, control rod is surrounded by fuel blocks only. The surrounding condition of the new cell model corresponds to the configuration around the reflector region control rod. The calculated reactivity at the first-step using the new cell model shows better results than previous calculation. It is considered that the new cell model brings appropriate neutron flux distribution around control rods in reflector region.

本文言語英語
ホスト出版物のタイトルICONE 2015 - 23rd International Conference on Nuclear Engineering
ホスト出版物のサブタイトルNuclear Power - Reliable Global Energy
出版社American Society of Mechanical Engineers (ASME)
2015-January
出版ステータス出版済み - 1 1 2015
外部発表はい
イベント23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015 - Chiba, 日本
継続期間: 5 17 20155 21 2015

その他

その他23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015
Country日本
CityChiba
Period5/17/155/21/15

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering

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