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JAEA Reports

Annual report for Nuclear Emergency Assistance and Training Center (April 1, 2019 - March 31, 2020)

Nuclear Emergency Assistance and Training Center

JAEA-Review 2020-016, 67 Pages, 2020/09

JAEA-Review-2020-016.pdf:4.09MB

The Japan Atomic Energy Agency (JAEA) is one of the designated public institutions, which is an agency dealing with an emergency situation in cooperation with the Japanese and local governments under the Disaster Countermeasures Basic Act and under the Armed Attack Situation Response Law. JAEA has, therefore, responsibilities of providing technical assistances to the Japanese and local governments in case of nuclear or radiological emergencies based on these Acts. To fulfill the assistances, the JAEA has prepared the Nuclear Emergency Support Measures Regulation, Disaster Prevention Work Plan and Civil Protection Work Plan. The Nuclear Emergency Assistance and Training Center (NEAT) is the main center of the technical assistance in case of emergency, and dispatches experts of JAEA, supplies equipment and materials and gives technical advice and information, to the Japanese and local governments for emergency based on the regulation and plans. In normal time, the NEAT provides the technical assistances such as the exercises and training courses concerning the nuclear preparedness and response to the JAEA experts and also to emergency responders including the Japanese and local government officers. This report introduces the results of activities in Japanese Fiscal Year 2019, conducted by NEAT in accordance with the third medium and long-term plan for the period from Japanese Fiscal Year 2015 to 2021.

Journal Articles

What's about "Fukushima Nuclear Accident Archive"

Kumazaki, Yui

Senmon Toshokan, (278), p.40 - 43, 2016/07

AA2016-0112.pdf:1.21MB

no abstracts in English

Oral presentation

Development of quick and remote analysis for severe accident reactor, 4-3; The Effects of focus optimization for laser induced breakdown spectroscopy

Akaoka, Katsuaki; Oba, Masaki; Miyabe, Masabumi; Wakaida, Ikuo

no journal, , 

In the elementary analysis using Laser Induced Breakdown Spectroscopy (LIBS), the intensity of the LIBS spectrum and plasma temperature is changed by the focus position of the laser beam. Therefore we inspected the effect of the optimization of the focus to reduce the instability of spectrum intensity.

Oral presentation

Development of quick and remote analysis for severe accident reactor, 5-3-2; Application for powder sample of Laser Induced Breakdown Spectroscopy

Akaoka, Katsuaki; Oba, Masaki; Miyabe, Masabumi; Wakaida, Ikuo

no journal, , 

We reported the LIBS using the powder sample which embrocated vaseline on the glass at AESJ 2017 Annual Meeting. In 2018, as a simpler and easier method, we applied the powder sample which wiped off with chemical dustcloths. As a result, we showed the possibility of the measurement by LIBS for the wiped powder sample.

Oral presentation

Development of quick and remote analysis for severe accident reactor, 6-2; Analysis of LIBS spectra using the least-square method for simulated fuel debris

Akaoka, Katsuaki; Oba, Hironori; Wakaida, Ikuo; Ouchi, Atsushi*; Mizusako, Fumiki*; Eto, Yoshinori*; Torimaru, Tadahiko*

no journal, , 

For measurement of the fuel debris from the Fukushima Daiichi Nuclear Power Station accident, we analyzed the LIBS spectrum of the mixed simulated fuel debris of U, Zr and Fe, using the least-squares method. We present the results of the calibration curve and analysis spectrum.

Oral presentation

Study on carbonized temperature estimation of charcoal remained in burnt area in Namie Town, Fukushima

Nomura, Naoki*; Arai, Hirotsugu*; Kuramoto, Takayuki*; Niizato, Tadafumi; Hayashi, Seiji*

no journal, , 

In 2017, a wildfire occurred in mountainous forest of Namie Town, Fukushima Prefecture, where is designated as a difficult-to-return zone due to high radiation dose after TEPCO's Fukushima Daiichi Nuclear Power Plant accident. With the wildfire, changes of dynamics of radionuclide, especially Cs-137 was concerned. In this study, we focused residual charcoal to estimate burning temperature of surface soil and litter because it affects the dissolution behavior of nutrients and radiocesium in soil and litter on the forest floor of the burnt area. As a result of the wildfire, Japanese cedar forest and mixed forest with predominance of Japanese red pine and Japanese oak were burned, so we set up three control sites at each forest and collected the residual charcoals from burnt sites nearby unburnt locations. To clarify the carbonized temperature of residual charcoal, thermal analysis by TG-DTA and infrared adsorption spectrum analysis by micro-FTIR were conducted for litters, artificially burnt litters, and residual charcoals.

Oral presentation

5 years monitoring results for the environmental dynamics of radiocesium in mountainous forest of the Abukuma Mountains, Fukushima

Niizato, Tadafumi; Watanabe, Takayoshi; Mitachi, Katsuaki*; Sasaki, Yoshito; Ito, Satomi; Abe, Hironobu

no journal, , 

An understanding of long-term environmental dynamics of radiocesium, which is released by the TEPCO's Fukushima Dai-ichi Nuclear Power Plant accident, is a key issue for predicting the future radiocesium distribution and forest products radioactivity in a forested environment, especially $$^{137}$$Cs with half-life of 30 years. We compiled the five-years monitoring results of radiocesium input-output budgets in broad-leaved deciduous forests and Japanese cedar evergreen forests of the Abukuma Mountains, Fukushima, Japan. The input-output rates were a few percent of the radiocesium inventory of the monitoring site. In addition, both rates have been decreasing with time. Belowground radiocesium occupied 90% of the total inventory in the Japanese cedar forest on October 2015. The belowground radiocesium was distributed mainly in the topsoil of 0-6 cm depth, approximately 70-80% of the underground inventory on August 2016. These results indicate that the distribution of radiocesium in the forest is similar to the distribution of tree rootlet responsible for absorption of inorganic elements, nutrients, and water. This means long residence time of radiocesium in rooting zone. In the condition of the limited amount of radiocesium input-output rates in the forest, estimation of the migration flux of radiocesium from forest floor to the forest products are considered to be most important issues in the present.

Oral presentation

Above- and belowground distribution of radiocesium released from TEPCO' FDNPP accident in the mountainous forest of Fukushima

Niizato, Tadafumi; Sasaki, Yoshito; Ito, Satomi; Mitachi, Katsuaki*; Watanabe, Takayoshi

no journal, , 

Oral presentation

Cesium-137 distribution and its transfer in mountain forest of Fukushima after the wildfire

Niizato, Tadafumi; Arai, Hirotsugu*; Hayashi, Seiji*

no journal, , 

The inventory of Cs-137 on the forest floor suffered from the wildfire in the Juman-yama region show no clear difference between the burnt and unburnt areas. The monitoring results of Cs-137 outflow from the mountain slope show high outflow rate one year after the wildfire, but restoration of forest floor cover results in the lower outflow rate next year after the wildfire.

Oral presentation

The Roles of Japan Atomic Energy Agency in health physics and environmental science; Based on experiences of the Fukushima accident

Uezu, Yasuhiro

no journal, , 

The roles of Japan Atomic Energy Agency in health physics and environmental science will be reported based on experiences of the Fukushima accident, several trables in JAEA.

Oral presentation

Characteristics of air dose rate distribution around houses in Iitate Village, Fukushima Prefecture

Kim, M.; Malins, A.; Machida, Masahiko; Yoshimura, Kazuya; Yoshida, Hiroko*; Saito, Kimiaki

no journal, , 

no abstracts in English

Oral presentation

Distribution of radiocesium in Japanese cedar and Japanese konara oak forests of the Abukuma Mountains, Fukushima

Niizato, Tadafumi; Sasaki, Yoshito; Watanabe, Takayoshi; Ito, Satomi; Amamiya, Hiroki*

no journal, , 

no abstracts in English

Oral presentation

Characteristics of air dose rate distribution inside and outside wooden houses after the Fukushima Daiichi Nuclear Power Plant accident

Kim, M.; Malins, A.; Machida, Masahiko; Yoshimura, Kazuya; Yoshida, Hiroko*; Saito, Kimiaki

no journal, , 

no abstracts in English

Oral presentation

A Historical perspective on JAERI/JAEA-ICRP relationship

Endo, Akira

no journal, , 

In December 2020, the International Conference on Recovery After Nuclear Accidents: Radiological Protection Lessons from Fukushima and Beyond is organized by the International Commission on Radiological Protection (ICRP) and hosted by Japan Atomic Energy Agency (JAEA) in association with several Japanese and international organizations. Collaboration between the ICRP and Japan Atomic Energy Research Institute (JAERI), the predecessor of JAEA, started in the early 1990s for the development of ICRP Publication. Since then, the ICRP and JAERI/JAEA have been continuing to cooperate in various tasks of radiation protection including response to the TEPCO Fukushima Daiichi Nuclear Power Plant Accident. For the recovery of Fukushima, continued cooperation of people involved in the accident, the ICRP and JAEA is required. This presentation looks back on the interaction of the ICRP and JAERI/JAEA over the past three decades and looks to future cooperation for the restoration of Fukushima.

14 (Records 1-14 displayed on this page)
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