Burn-up dependency of control rod position at zero-power criticality in the high-temperature engineering test reactor

Yuki Honda, Nozomu Fujimoto, Hiroaki Sawahata, Shoji Takada, Kazuhiro Sawa

Research output: Contribution to journalArticle

Abstract

The high-temperature engineering test reactor (HTTR) is a block-type high-temperature gas-cooled reactor (HTGR), which was constructed in Japan. The operating data of HTTR with burn-up to about 370 EFPD (effective full-power days), which are very important for the development of HTGRs, have been collected in both zero-power and powered operations. In the aspects of code validation, the detailed prediction of temperature distribution in the core makes it difficult to validate the calculation code because of difficulty in measuring the core temperature directly in powered operation of the HTTR. In this study, the measured data of the control rod position, while keeping the temperature distribution in the core uniform at criticality in zero-power operation at the beginning of each operation cycle were compared with the calculated results by core physics design code of the HTTR. The measured data of the control rod position were modified based on the core temperature correlation. At the beginning of burn-up, the trends of burn-up characteristics are slightly different between experimental and calculation data. However, the calculated result shows less than 50 mm of small difference (total length of control rod is 4060 mm) to the measured one, which indicates that the calculated results appropriately reproduced burn-up characteristics, such as a decrease in uranium-235, accumulation in plutonium, and decrease in burnable absorber.

Original languageEnglish
Article number011013
JournalJournal of Nuclear Engineering and Radiation Science
Volume3
Issue number1
DOIs
Publication statusPublished - Jan 1 2017

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engineering test reactors
Criticality (nuclear fission)
High temperature engineering
control rods
Control rods
high temperature gas cooled reactors
Temperature distribution
uranium 235
temperature distribution
High temperature gas reactors
Plutonium
Uranium
plutonium
Physics
Japan
absorbers
Temperature
trends
cycles
physics

All Science Journal Classification (ASJC) codes

  • Radiation
  • Nuclear Energy and Engineering

Cite this

Burn-up dependency of control rod position at zero-power criticality in the high-temperature engineering test reactor. / Honda, Yuki; Fujimoto, Nozomu; Sawahata, Hiroaki; Takada, Shoji; Sawa, Kazuhiro.

In: Journal of Nuclear Engineering and Radiation Science, Vol. 3, No. 1, 011013, 01.01.2017.

Research output: Contribution to journalArticle

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