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Department of Fukushima Technology Development
JAEA-Review 2014-057, 45 Pages, 2015/03
JAEA-Review-2014-057.pdf:3.2MB
The governmental program is progressed to build the new hot laboratory (which is called active laboratory) at the nearest area of Fukushima-Daiichi Nuclear Power Station for the development of abolishment techniques of the reactors. Several kinds of sample, which are including the fuel debris, will be examined in the laboratory. The working group for Post Irradiation Examination in our department has the recommendation for the new laboratory and new apparatus for future generation based on the survey of recent needs internationally. This report describes the some recommendations and the results of our review.
Department of Fukushima Technology Development
JAEA-Review 2014-017, 135 Pages, 2014/06
JAEA-Review-2014-017-01.pdf:50.19MBJAEA-Review-2014-017-02.pdf:45.49MBJAEA-Review-2014-017-03.pdf:22.61MB
The Department of Hot Laboratories and Facilities in the Nuclear Science Research Institute was supporting research activities on the safety and basic researches for nuclear fuels materials and reactor structural materials and so on. Our department was in charge of operation and management of 11 research facilities including 4 hot laboratories, in which nuclear fuel materials such as uranium and plutonium, and various radioactive isotopes were handled. This document describes the activity record of the detailed damage situations and their restorations of 11 facilities against the 2011 off the Pacific coast of Tohoku earthquake. About the restoration situation of facilities, restoration activities of 8 facilities out of 11 facilities were completed by March 31st, 2013. This document is a continuation of the Part I Emergency Activities at Onset (JAEA-Review 2011-048) witch was described just after the earthquake.
Department of Fukushima Technology Development
JAEA-Review 2013-047, 161 Pages, 2014/02
JAEA-Review-2013-047.pdf:3.94MB
The Department of Fukushima Technology Development in the Nuclear Science Research Institute was established in 2012 to support research activities on safety and basic technologies toward the decommissioning of Fukushima-Daiichi Nuclear power reactors whose cores were severely damaged. Our department is in charge of operation and management of 22 research facilities including 4 critical facilities, 13 nuclear fuel material usage facilities, and so on, in which nuclear fuel materials such as uranium and plutonium, and various radioactive isotopes are handled. This report describes major activities on operation and management in our facilities during April 1st, 2012 to March 31st, 2013 (i.e. Japanese fiscal year 2012).
Department of Partnership Operations for Environmental Remediation, Headquarters of Fukushima Partne; Ningyo-toge Environmental Engineering Center; Vitrification Technology Development Department, Tokai Reprocessing Technology Development Center; Environmental Protection Section, Radiation Protection Department
JAEA-Research 2011-026, 74 Pages, 2011/11
JAEA-Research-2011-026.pdf:5.9MB
After the Fukushima nuclear accident, extensive area was contaminated with radionuclides from the Fukushima Daiichi Nuclear Power Plant and various methods have been investigated to remedy such contamination. To understand potential of in-situ ground heating and radionuclide desorption, behaviors of ground temperature and of radiocesium volatility by in-situ heating was investigated. More than 15 minutes was necessary to accomplish melting temperature of several cesium compounds by heating using portable burner and maximum temperature was about 700 degree in Celsius. At the time ground surface temperature was about 600 degree, the temperature at 1cm depth was about 300 degree, whereas the temperature at 5cm depth was 50-60 degree. Under the condition of heating temperature of 600-1,300 degree and heating period of 5-60 minutes, activity of Cs-134 and Cs-137 varied in the range of -9.8 to +14.0% after heating using electric furnace and any volatility of radiocesium was not recognized. TG/DTA analysis for soil and zeolite (mordenite) which mixed with nonradioactive Cs compound each were also carried out to understand chemical form and volatility behavior of radiocesium. It is suggested that chemical compound e.g., CsAlSiO
would be formed when SiO
and AlO
3 were composed in the system and radiocesium would remain in soil under the high temperature condition, whereas Cs in CsCO would be volatized in the SiO and/or AlO free system.