No abstract available

[en] Nuclear data plays an important role for studies of radiation protection dosimetry. Accurate nuclear data lead us to reliable results on dosimetric calculations. In this paper, the application of nuclear data to radiation protection dosimetry is demonstrated with the calculation of dose conversion coefficients for radionuclides in the environment. A problem in reproduction of forward neutron spectra for proton incidence with high-energy nuclear data is also discussed. (author)

[en] Status of research in the surrogate method based on heavy-ion as well as light-ion projectiles carried out at JAEA in collaboration with other organizations is described. (author)

[en] A set of ORIGEN2 library for light water reactors was newly developed based on JENDL-4.0. High performance of the library was confirmed by comparison with assay data of LWR spent fuels. (author)

[en] At present, accelerator-based neutron sources are under development worldwide for spread of boron neutron capture therapy (BNCT). In the accelerator-based neutron source, the neutron energy spectrum becomes distorted. We are now developing various devices for BNCT. The objective of the present study is thus to develop thermal and epithermal columns for basic experimental studies for the new measuring devices. In the present paper, details of design and construction of a thermal column are described using an Am-Be neutron source. (author)

[en] Recent domestic and international activities of intermediate energy nuclear data measurements are overviewed. A strategy meeting on nuclear data research was held in June 2011 at RCNP, Osaka University in order to discuss the needs of intermediate energy nuclear data in various applications and proposals of new measurements among domestic researchers in universities, national institutes, and industries. Based on the summary, future perspectives on intermediate energy nuclear data measurements are remarked. (author)

[en] There are several facilities with intense spallation neutron sources in the world, and some of them are being utilized for neutron cross section measurement in a low energy region. In the present paper, characteristics of those facilities are described and comparison among them is made. Recent research activities at those facilities are also presented. Moreover, the perspective of those activities, especially those at J-PARC/MLF, is described. (author)

[en] Data libraries for neutron transport and burn-up calculations are produced on the basis of JENDL-4.0. Accurate prediction of isotope generation and depletion for LWR fuels are achieved by using the data libraries. (author)

[en] JENDL-4.0, the latest version of Japanese Evaluated Nuclear Data Library (JENDL), was released in May 2010. In order to validate JENDL-4.0, we have analyzed TOF experiments at Osaka University OKTAVIAN with JENDL-4.0 and the Monte Carlo N-Particle transport code MCNP5. And for comparison, older version JENDL-3.3 and other recent nuclear data libraries ENDF/B-VII.0 and JEFF-3.1 have also been used. As a result, the followings have been found out: (1) Si, As, Se, Mo, W: Calculation results with JENDL-4.0 agreed with the experimental ones better than those with JENDL-3.3. (2) Cr, Mn, Nb: Calculation results with JENDL-4.0 were partially better and partially worse than those with JENDL-3.3. (author)

[en] The greatest earthquake on record, which occurred on 11th March, 2011, and the large tsunami caused by the quake have hit the Fukushima Dai-ichi nuclear power plant of Tokyo Electric Power Company (TEPCO), and that resulted in the loss of all electric power (station blackout). Then, three reactors (units 1, 2 and 3) and four spent fuel storage pools (units 1 to 4) have lost the all cooling functions, and hence the cores melted down, followed by the hydrogen explosions in the reactor buildings. Consequently, a large amount of radioactive materials were released to the environment and contaminated the soil, water, foods, etc. More than hundred thousand residents evacuated from their hometowns. At present, seven months have passed, the accident is not yet terminated although the cooling systems for the reactors and pools are working well. In this paper, the accident at the Fukushima Dai-ichi nuclear power plant is reviewed, and the lessons learned from the accident are discussed. (author)