Material properties evaluation on radiation shielding lead glasses irradiated by pulsed laser

Wakui, Takashi; Yamasaki, Kazuhiko*; Futakawa, Masatoshi

Advanced Experimental Mechanics, 7, p.103 - 109, 2022/08

As part of the development of technique to cut and reduce the volume of highly radioactive components in the closed space, pulsed Nd:YAG laser was irradiated to radiation shielding glasses with the different lead content in the different irradiation condition; power and number of irradiation. The large black irradiated area with concave shape and cracks around it occurred with an increase of the lead content, power and number of irradiation. General mechanical properties in unirradiated and irradiated area were investigated to investigate the influence of mechanical properties on the irradiation damage. The thermal impact fracture toughness calculated based on the estimated mechanical properties decreased with increasing the lead content. The micro hardness in black irradiated area was 10% smaller than that in the unirradiated area. The change of the mechanical property due to the laser irradiation was confirmed.

Necessity (proposal) of secure detection system of nuclear materials and interior inspection systems of detected / suspicious objects in non-destructive manner for safe dismantling

Seya, Michio; Hajima, Ryoichi*; Kureta, Masatoshi

Dai-37-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu (CD-ROM), 10 Pages, 2017/02

Large size freight cargo containers are the most volunurable items from nuclear security points of view because of their large volume and weight of cargo inside for hiding heavily shielded objects. For strengthning nuclear security, secure detection of NMs in heavily shielded objects, and safe handling (dismatlement) of detected / suspicious objects for taking out of NMs, are essential. These require the following things, (1) Introduction of secure detection system of NMs, (2) Inspection of deteiled and interior structures of detected objects, (3) Rough chracterization of NMs (for nuclear bomb or RDD etc.) / Confirmation of existence of explosives etc.. By using information obtained by interior inspections, safe dismantlement of objects and taking NMs out are possible. In this papaer, we propose a combined system of X-ray scanning system with NRF-based NDD system using monochromatic -ray beam not only as a secure detection system of NMs but also interior inspection system (covering (1) and (2)). Also we propose active neutron NDA system using a D-T source for interior inspection of NM part (covering (3)).

Field emission-type scanning electron microscope for examination of irradiated fuels

Yasuda, Ryo; Mita, Naoaki; Nishino, Yasuharu; Nakata, Masahito; Nozawa, Yukio; Harada, Katsuya; Kushida, Teruo; Amano, Hidetoshi

Nuclear Technology, 151(3), p.341 - 345, 2005/09

https://doi.org/10.13182/NT05-A3656

The Field Emission type Scanning Electron Microscope (FE-SEM), which is one of effective tools for observation of micr-structures, was installed at the Reactor Fuel Examination Facility (RFEF) in JAERI. The FE-SEM is equipped in a large shield vessel with remote handling systems to keep safety of operators and is modified to enable to manipulate high radioactive materials. The Energy Dispersive Spectrometer (EDS) with radiation-shielded collimators has been also equipped on the FE-SEM to determine element compositions of the observed material samples. Characterization tests were carried out using deposited gold film and Zircaloy cladding tubes with hydrides to confirm the machine performance after the modifications. In the results of the tests, high-resolution images without some noises and fogs were obtained with high magnification above 10,000. Those results show that the FE-SEM keeps the high performance after some improvements and modifications for shielding -rays and handling radioactive samples.

Decay heat measurement of fusion related materials in an ITER-like neutron field

Morimoto, Yuichi*; Ochiai, Kentaro; Maekawa, Fujio; Wada, Masayuki*; Nishitani, Takeo; Takeuchi, Hiroshi

Journal of Nuclear Materials, 307-311(Part2), p.1052 - 1056, 2002/12

https://doi.org/10.1016/S0022-3115(02)01296-5

Decay heat is one of the most important factors for the safety aspect of ITER. Especially, prediction of decay heat with uncertainty less than 15% for the three most important materials, i.e., copper, type-316 stainless steel (SS-316) and tungsten, is strongly requested by designers of ITER. To provide experimental decay heat data needed for validation of decay heat calculations for SS316 and copper, an experiment was conducted as the ITER/EDA task T-426. An ITER-like neutron field was constructed, and decay heat source distributions in thick copper and SS316 plates were measured with Whole Energy Absorption Spectrometer. The measured decay heat distributions in the thick sample plates were compared with the predicted values by MCNP calculations. It was found that the use of an effective activation cross section calculated by MCNP was needed to consider the self-shielding effects and, for both cases, MCNP calculations could predict decay heat adequately.

Shielding calculation constants for use in effective dose evaluation for photons, neutrons and bremsstrahlung from beta-ray

Sakamoto, Yukio; Endo, Akira; Tsuda, Shuichi; Takahashi, Fumiaki; Yamaguchi, Yasuhiro

JAERI-Data/Code 2000-044, 191 Pages, 2001/01

JAERI-Data-Code-2000-044.pdf:7.19MB

no abstracts in English

Simplified shield calculation system for high-intensity proton accelerators

Masumura, Tomomi*; Nakashima, Hiroshi; Nakane, Yoshihiro; Sasamoto, Nobuo

JAERI-Data/Code 2000-026, 40 Pages, 2000/06

JAERI-Data-Code-2000-026.pdf:7.21MB

no abstracts in English

Analysis on temperature rise of primary upper shielding in HTTR

Ogawa, Masuro; Shiina, Yasuaki; Fumizawa, Motoo; Takeda, Tetsuaki; Takada, Shoji; Kubo, Shinji; Inaba, Yoshitomo

JAERI-Tech 98-062, 126 Pages, 1999/01

JAERI-Tech-98-062.pdf:5.95MB

no abstracts in English

Second version of Japanese evaluated nuclear data library,JENDL-2

Kikuchi, Yasuyuki; Nakagawa, Tsuneo; Asami, Tetsuo; *; *; *

Journal of Nuclear Science and Technology, 22(8), p.593 - 603, 1985/00

https://doi.org/10.3327/jnst.22.593

no abstracts in English

Group Constants for Th with 70 and 25group Structures

Nakagawa, Masayuki; *; *; *; *

JAERI-M 4927, 22 Pages, 1972/08

JAERI-M-4927.pdf:0.81MB

no abstracts in English

Shielding design for transport cask of mercury target vessel irradiated at J-PARC

Harada, Masahide; Uchida, Toshitsugu; Sekijima, Mitsuaki; Haga, Katsuhiro; Kogawa, Hiroyuki; Kinoshita, Hidetaka; Takada, Hiroshi

no journal, , 

no abstracts in English