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Journal Articles

Report on investigation of unexpected reactor shutdown of the TRACY facility; Cause and countermeasures

Sono, Hiroki; Tsukamoto, Michio; Aizawa, Eiju; Takeuchi, Masaki; Fukaya, Yuji; Iseda, Hirokatsu*; Ogawa, Kazuhiko; Sakuraba, Koichi; Tonoike, Kotaro

UTNL-R-0446, p.3_1 - 3_10, 2005/03

This report describes an investigation and countermeasures of the unexpected reactor shutdown of the TRACY facility at the Japan Atomic Energy Research Institute on June 17, 2004, caused by a malfunction of a safety rod of the facility. As a result of the investigation, the principal cause of the malfunction was ascribed to a drop in attraction of a binding magnet for the safety rod by a small piece of a foreign material. The following countermeasures were taken against its recurrence: prevention of incidence of foreign materials, reduction of the chance of intrusion of foreign materials into devices, and certain detection of foreign materials. This lesson learned through the experience is expected to be shared with the staffs concerned in reactor operation and maintenance.

Journal Articles

Determination of $$gamma$$-ray exposure rate from short-lived fission products under criticality accident conditions

Yanagisawa, Hiroshi; Ono, Akio; Aizawa, Eiju

Journal of Nuclear Science and Technology, 39(5), p.499 - 505, 2002/05

 Times Cited Count:4 Percentile:29.29(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Report of TRACY operation

Aizawa, Eiju; Ogawa, Kazuhiko; Sakuraba, Koichi; Tsukamoto, Michio; Sugawara, Susumu; Takeuchi, Masaki*; Miyauchi, Masakatsu; Yanagisawa, Hiroshi; Ono, Akio

JAERI-Tech 2002-031, 120 Pages, 2002/03

JAERI-Tech-2002-031.pdf:4.32MB

TRACY (Transient Experiment Critical Facility) in NUCEF (Nuclear Safety Research Facility) is the pulse-type critical facility using uranyl nitrate solution which can carry out various supercritical experiments changing reactivity addition up to 3$.TRACY achieved its first criticality on 20th December 1995,and transient operations have been conducted Since1996.This report summarizes the operation data of 176 experiments from the first criticality to FY2000.

JAEA Reports

TRACY transient experiment databook, 3; Ramp feed experiment

Nakajima, Ken; Yamane, Yuichi; Ogawa, Kazuhiko; Aizawa, Eiju; Yanagisawa, Hiroshi; Miyoshi, Yoshinori

JAERI-Data/Code 2002-007, 123 Pages, 2002/03

JAERI-Data-Code-2002-007.pdf:4.34MB

no abstracts in English

JAEA Reports

TRACY transient experiment databook, 2; Ramp withdrawal experiment

Nakajima, Ken; Yamane, Yuichi; Ogawa, Kazuhiko; Aizawa, Eiju; Yanagisawa, Hiroshi; Miyoshi, Yoshinori

JAERI-Data/Code 2002-006, 176 Pages, 2002/03

JAERI-Data-Code-2002-006.pdf:6.33MB

no abstracts in English

JAEA Reports

TRACY transient experiment databook, 1; Pulse withdrawal experiment

Nakajima, Ken; Yamane, Yuichi; Ogawa, Kazuhiko; Aizawa, Eiju; Yanagisawa, Hiroshi; Miyoshi, Yoshinori

JAERI-Data/Code 2002-005, 158 Pages, 2002/03

JAERI-Data-Code-2002-005.pdf:6.55MB

no abstracts in English

Journal Articles

Time delay of thermal neutron detection during power burst in TRACY

Yanagisawa, Hiroshi; Ono, Akio; Ogawa, Kazuhiko; Aizawa, Eiju; Yokoyama, Mitsutaka*

Journal of Nuclear Science and Technology, 38(8), p.591 - 599, 2001/08

 Times Cited Count:6 Percentile:44.13(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Development of solution behavior observation system under criticality accident conditions in TRACY

Ogawa, Kazuhiko; Morita, Toshio*; Yanagisawa, Hiroshi; Aizawa, Eiju; Sakuraba, Koichi; Sugawara, Susumu; Ono, Akio

Journal of Nuclear Science and Technology, 37(12), p.1088 - 1097, 2000/12

no abstracts in English

Oral presentation

Experience of TRACY experiments

Aizawa, Eiju; Yamane, Yuichi

no journal, , 

TRACY (Transient experiment critical facility) is a reactor to perform supercritical experiments using low-enriched uranyl nitrate aqueous solution. In a supercritical experiment, up to 3$ of reactivity is inserted by withdrawing a control rod, called "transient rod," from the center of the core tank or feeding fuel solution into the core tank.Since 1996, TRACY supercritical experiments have been performed and transient data such as power, temperature and pressure have been measured and evaluated. Furthermore, we have developed a system to observe solution behavior under criticality accident condition for the elucidation of transient events. Those experiences we have gained through the TRACY experiments will be presented at the lecture in the 46th reactor physics summer seminar of the Atomic Energy Society of Japan.

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