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

Yuki Honda, Nozomu Fujimoto, Sawahata Hiroaki, Sawa Kazuhiro

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationICONE 2015 - 23rd International Conference on Nuclear Engineering
Subtitle of host publicationNuclear Power - Reliable Global Energy
PublisherAmerican Society of Mechanical Engineers (ASME)
Volume2015-January
Publication statusPublished - Jan 1 2015
Externally publishedYes
Event23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015 - Chiba, Japan
Duration: May 17 2015May 21 2015

Other

Other23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015
CountryJapan
CityChiba
Period5/17/155/21/15

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering

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