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Journal Articles

Influence of chemical speciation in reactor cooling system on pH of suppression pool during BWR severe accident

Shiotsu, Hiroyuki; Ishikawa, Jun; Sugiyama, Tomoyuki; Maruyama, Yu

Journal of Nuclear Science and Technology, 55(4), p.363 - 373, 2018/04

 Percentile:100(Nuclear Science & Technology)

Journal Articles

Bayesian optimization analysis of containment-venting operation in a Boiling Water Reactor severe accident

Zheng, X.; Ishikawa, Jun; Sugiyama, Tomoyuki; Maruyama, Yu

Nuclear Engineering and Technology, 49(2), p.434 - 441, 2017/03

Journal Articles

Experimental investigation of the influence of Mo contained in stainless steel on Cs chemisorption behavior

Di Lemma, F. G.; Nakajima, Kunihisa; Yamashita, Shinichiro; Osaka, Masahiko

Journal of Nuclear Materials, 484, p.174 - 182, 2017/02

 Times Cited Count:4 Percentile:18.09(Materials Science, Multidisciplinary)

Chemisorption phenomena can affect fission products retention in the nuclear reactor vessel during a Severe Accident (SA). This paper will describe the influence of molybdenum contained in type 316 stainless steel (SS) on Cs chemisorption. Our experiments showed the formation of Cs-Mo compounds in addition to CsFeSiO$$_{4}$$, observed previously on SS304. The results of high temperature stability tests on the deposits are also presented. These tests aimed at simulating the revaporization of FP from structural materials during a SA. From our results, it can be inferred that Cs-Mo deposits may revaporize, contributing as a delayed source to the radioactive release.

Journal Articles

Bayesian optimization analysis of containment venting operation in a BWR severe accident

Zheng, X.; Ishikawa, Jun; Sugiyama, Tomoyuki; Maruyama, Yu

Proceedings of 13th Probabilistic Safety Assessment and Management Conference (PSAM-13) (USB Flash Drive), 10 Pages, 2016/10

JAEA Reports

Boron release kinetics from mixed melts of boron carbide, stainless steel and Zircaloy; A Literature review on the behavior of control rod materials under severe accidents

Di Lemma, F. G.; Miwa, Shuhei; Osaka, Masahiko

JAEA-Review 2016-007, 27 Pages, 2016/03

JAEA-Review-2016-007.pdf:1.88MB

During a nuclear power plant Severe Accident, complex boron melts can be formed, due to interaction of the control rods with the cladding materials. These can affect ultimately the source term assessment. This review will describe the results of previous studies on boron carbide/stainless steel/Zircaloy (B$$_{4}$$C/SS/Zry) melts, which will finally provide guidance for the needs of future experiments. This review showed that models for the behavior of complex B$$_{4}$$C/SS/Zry melts are limited, and unsuccessful in simulating core degradation, thus the improvement of the database for B$$_{4}$$C/SS/Zry melts is needed. Our experimental plan aims in providing thermodynamics and kinetics models for such melts, with the final aim of improving boron modelling in SA codes analysis and of understanding its effect on fission products behavior.

JAEA Reports

Research and development on partitioning in JAERI; Review of the research activities until the development of 4-group partitioning process

Morita, Yasuji; Kubota, Masumitsu*

JAERI-Review 2005-041, 35 Pages, 2005/09

JAERI-Review-2005-041.pdf:2.24MB

Research and development on Partitioning in JAERI are reviewed in the present report from the beginning to the development of the 4-Group Partitioning Process and its test with real high-level liquid waste (HLLW). In the 3-Group Partitioning Process established in around 1980, elements in HLLW are separated into 3 groups of transuranium element group, Sr-Cs group and the other element group. The 4-Group Partitioning Process subsequently developed contains the separation of Tc-platinum group metals additionally. The process was tested to demonstrate its performance with real concentrated HLLW. Until then, various separation methods for various elements were studied and selection and optimization of the separation methods were carried out to establish the process. Review of the experience, findings and results is very important and valuable for future study on partitioning. The present report is prepared from this point of view.

Journal Articles

Analysis of pressure- and temperature- induced steam generator tube rupture during PWR severe accident initiated from station blackout

Hidaka, Akihide; Maruyama, Yu; Nakamura, Hideo

Proceedings of 6th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Operations and Safety (NUTHOS-6) (CD-ROM), 15 Pages, 2004/00

Severe accident studies showed that Direct Containment Heating issue was resolved for PWRs because a creep rupture at pressurizer surge line would occur prior to the melt-through of Reactor Pressure Vessel during station blackout (TMLB'). However, it was recently concerned that, if the secondary system is depressurized during TMLB', the creep rupture at SG U-tubes would occur earlier than the surge line. This pressure- and temperature-induced SG U-tube rupture (PTI-SGTR) is not preferable because of the increase in offsite consequences. The SCDAP/RELAP5 analyses by USNRC showed that the surge line would fail earlier than the U-tubes. However, the analyses used a coarse nodilization for steam mixing at the SG inlet plenum that could affect the temperature of U-tubes. To investigate the effect of steam mixing, an analysis was performed with MELCOR1.8.4. The analysis showed that the surge line would fail earliest during TMLB' while the U-tubes could fail earliest during TMLB' with secondary system depressurization. Further investigation is needed for occurrence conditions of PTI-SGTR.

Journal Articles

Maintenance methods and procedures for the power conversion system of the Gas Turbine High Temperature Reactor 300 (GTHTR300)

Kosugiyama, Shinichi; Takei, Masanobu; Takizuka, Takakazu; Takada, Shoji; Yan, X.; Kunitomi, Kazuhiko

Nippon Genshiryoku Gakkai Wabun Rombunshi, 2(4), p.532 - 545, 2003/12

no abstracts in English

Journal Articles

The JAERI-KEK joint RIB project

Takeuchi, Suehiro

AIP Conference Proceedings 680, p.229 - 236, 2003/00

JAERI and KEK-Institute of Particle and Nuclear Studies are collabarating to build an ISOL-type radioactive ion beam(RIB) acceleration system in the JAERI-Tokai tandem accelerator lab. In this project, the tandem accelerator is used as a proton beam driver to create RIB from fission products of a uranium target and a RIB accelerator already built by KEK will be installed in an old target room of the tandem accelerator lab. The beam energy is 1.1 MeV/nucleon, which is not sufficient for experiments related to nuclear reactions. They have a plan to boost the beams to 5 - 9 MeV/u by developing a pre-booster and using existing super-conducting tandem-booster. The plan of this project, acceleration divices and present status will be outlined in the RIB session of the CAARI.

Journal Articles

Conceptual design study of the transmutation experimental facilities

Sasa, Toshinobu; Oigawa, Hiroyuki; Kikuchi, Kenji; Ikeda, Yujiro

Proceedings of American Nuclear Society Conference "Nuclear Applications in the New Millennium" (AccApp-ADTTA '01) (CD-ROM), 7 Pages, 2002/00

A design study of the accelerator-driven system (ADS) for transmutation of minor actinides and long-lived fission products has been performed at Japan Atomic Energy Research Institute (JAERI) under the national OMEGA program. To solve the technical issues related to the ADS development, a transmutation experimental facility (TEF) is planned to bulid under the JAERI-High Energy Accelerator Research Organization joint project. The TEF consists of two facilities, Transmutation Physics Experimental Facility and Transmutation Engineering Experimental Facility. Proton beams of 600 MeV and 0.3 mA are to be delivered to this facility. The presentation describes a conceptual design study of the TEF.

Journal Articles

Social acceptability and scientific prospect of fusion energy, 7; Safety

Seki, Yasushi

Purazuma, Kaku Yugo Gakkai-Shi, 74(8), p.795 - 801, 1998/08

no abstracts in English

Journal Articles

Physical features of target and blanket

IAEA-TECDOC-985, 0, p.32 - 43, 1997/11

no abstracts in English

JAEA Reports

Analytical results of radiochemistry of the JRR-3M

;

JAERI-Tech 97-029, 47 Pages, 1997/07

JAERI-Tech-97-029.pdf:1.82MB

no abstracts in English

JAEA Reports

Review of experimental studies of zirconium carbide coated fuel particles for high temperature gas-cooled reactors

Minato, Kazuo; Ogawa, Toru; Fukuda, Kosaku

JAERI-Review 95-004, 26 Pages, 1995/03

JAERI-Review-95-004.pdf:0.95MB

no abstracts in English

Journal Articles

Comparison of calculated alues with measured values on the amount of TRU and FP nuclides accumulated in gadolinium bearing PWR spent fuels

Adachi, Takeo; Nakahara, Yoshinori; Kono, Nobuaki; Gunji, Katsubumi; ; ; ; Kato, Kaneharu; Tachikawa, Enzo; *; et al.

Journal of Nuclear Science and Technology, 31(10), p.1119 - 1129, 1994/10

 Times Cited Count:8 Percentile:37.28(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Properties measurements of silicide fuels for JMTR safety evaluation

; *; ; Yamamoto, Katsumune; Oyamada, Rokuro; Saito, Minoru

JAERI-M 94-042, 0, p.305 - 312, 1994/03

no abstracts in English

Journal Articles

Accelerator-based transmutation

Dai-26-Kai Robutsuri Kaki Semina, Tekisuto; Shometsu Shori Kenkyu, 0, p.47 - 66, 1994/00

no abstracts in English

Journal Articles

Verification of fission product release model from High Temperature Engineering Test Reactor fuel

Sawa, Kazuhiro; Shiozawa, Shusaku; Fukuda, Kosaku;

Journal of Nuclear Science and Technology, 29(9), p.842 - 850, 1992/09

no abstracts in English

Journal Articles

Release of fission products from silicide fuel at elevated temperatures

; Saito, Minoru; Oyamada, Rokuro; ; ; Saito, Junichi; Iwai, Takashi; ; Nakagawa, Tetsuya

Nucl. Saf., 33(3), p.334 - 343, 1992/07

no abstracts in English

JAEA Reports

Evaluation of lift-off fraction in accident condition of HTGR

Sawa, Kazuhiro; ; *; Endo, Yasuichi; Shiozawa, Shusaku;

JAERI-M 91-207, 34 Pages, 1991/12

JAERI-M-91-207.pdf:0.93MB

no abstracts in English

66 (Records 1-20 displayed on this page)