Characteristics of Neutron Guide Tubes in Upgraded JRR-3.

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概要

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• The JRR-3 has been upgraded to be a new high performance research reactor JRR-3M with neutron guide tubes on a large scale and a cold neutron source. The neutron fluxes and spectra were measured at the end of the two thermal and three cold neutron guide tubes. The gain of the cold neutron source is also found from these spectra. The neutron fluxes of thermal neutron guide tubes with characteristic wavelength 2 Å are 1.2×10<SUP>8</SUP>n/cm<SUP>2</SUP>•s at a reactor power of 20 MW. The neutron fluxes of cold guide tubes are 2.0×10<SUP>8</SUP>n/cm<SUP>2</SUP>•s with characteristic wavelength 4Å and 1.4×10<SUP>8</SUP>n/cm<SUP>2</SUP>•s with 6Å when the cold neutron source is operated. The neutron spectra measured by the time-of-flight method agree well with their designed ones. The gains of the cold neutron source are 8 for 4 Å and 20 for 6 Å at a reactor power of 20 MW.

• 一般社団法人 日本原子力学会の論文

著者

• Suzuki Masatoshi

  Japan Atomic Energy Research Institute

• KIKUCHI Hitoshi

  NKK Corp.

• KAWABATA Yuji

  Japan Atomic Energy Research Institute

• SANO Masahiko

  NKK Corp.

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