Development of safety design technologies for sodium-cooled fast reactor coupled to thermal energy storage system with sodium-molten salt heat exchanger; Project overview

Yamano, Hidemasa; Kurisaka, Kenichi; Takano, Kazuya; Kikuchi, Shin; Kondo, Toshiki; Umeda, Ryota; Shirakura, Shota*

Dai-27-Kai Doryoku, Enerugi Gijutsu Shimpojiumu Koen Rombunshu (Internet), 5 Pages, 2023/09

This project studies investigation on safety design guideline and risk assessment technology for sodium-cooled fast reactor with the molten-salt heat storage system, development of evaluation method for heat transferring performance between sodium and molten-salt and improvement of the performance, and evaluation of chemical reaction characteristic between sodium and molten-salt and improvement of its safety. The project overview is presented in this report.

Contribution to the carbon neutrality by advanced reactor coexisting with renewable energy system

Ohno, Shuji; Yamano, Hidemasa

Nihon Genshiryoku Gakkai-Shi ATOMO, 65(7), p.438 - 442, 2023/07

https://doi.org/10.3327/jaesjb.65.7_438

This report mainly introduces international/domestic development trends of advanced reactor systems that can coexist with renewable energy in addition to describing the importance of dispatchable energy for the extension of variable renewable energy.

Development of FBG sensors by ultrashort pulse laser processing; Installation on high temperature pipeline and strain measurement

Nishimura, Akihiko

Dai-62-Kai Koha Senshingu Gijutsu Kenkyukai Koen Rombunshu, p.79 - 86, 2018/12

Thermal Energy Storage (TES) is important to stabilize increasing large amount of fluctuating renewable energy. For safety operation of TES, remote sensing by Fiber Bragg Grating (FBG) sensors is expected. FGB sensors were fabricated using precisely focused picosecond laser pulses. For the best use of heat resistant characteristic, we demonstrated to embed the FBG sensors in metal mold using colloidal silver adhesive. The FBG sensors were tested using a sodium circulation loop in JAEA Tsuruga site. Sodium was circulated with temperature of 500 degree. During emergency cooling, sudden shrinking of the loop was recorded. The application of FBG sensors to advanced remote monitoring for next generation TES plant is proposed.

Compatibility test between molten salts for high temperature heat storage and alloys

Shiina, Yasuaki; Kuriki, Yoshiro*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 2(3), p.375 - 378, 2003/09

https://doi.org/10.3327/taesj2002.2.375

no abstracts in English

Study on effect of effective thermal conductivities on melting characteristics of latent heat storage capsules

Shiina, Yasuaki; Inagaki, Terumi*

Nihon Kikai Gakkai Rombunshu, B, 69(681), p.1233 - 1241, 2003/05

https://doi.org/10.1299/kikaib.69.1233

In order to reduce phase change time in latent heat technology, improvement of effective thermal conductivity of heat storage unit would be one of the techniques. Effect of effective thermal conductivity on melting time are studied analytically of circular composite heat storage capsules made by immersing phase change materials (PCM) into porous metals. Numerical and approximate analysis were made with the consideration of uniform and non-uniform heat transfer coefficients around the cylindrical surface. Four PCMs (HO,Octadecane, LiCO, NaCl) and three metals (copper, aluminum and carbon steel) were selected specific materials. Porosity of the metals were restricted larger than 0.9 in order to lessen decrease in latent heat. Results show that reduction in melting time was obtained for the above PCMs, especially for low conductivity PCMs. Melting time obtained by approximate analysis agrees well with numerical analysis. High Nusselt number and high thermal conductivity of heat transfer fluid would be more effective to reduce phase change time.

Study on thermal characteristics of composite heat storage units made by impregnation of phase change material into porous materials; For cases of porous ceramics and porous metals (Cooperative research)

Shiina, Yasuaki; Komaki, Katsuya*; Tanaka, Gaku*; Hishida, Makoto*

JAERI-Tech 2001-076, 49 Pages, 2001/11

JAERI-Tech-2001-076.pdf:2.3MB

no abstracts in English

Simulation of second fire incident in the filling room (R152)

Miura, Akihiko;

JNC TN8410 99-046, 35 Pages, 1999/10

JNC-TN8410-99-046.pdf:7.29MB

Judging from several evidences which are operators' testimony, observation result, and so on, the "Committee for an Investigation into the Fire and Explosion Incident at the BDF of the Reprocessing plant of Tokai Works" concluded another fire incident occurred in the filling room (R152) after the explosion (hereafter called second fire incident). This report explains the simulation result of second fire incident. Calculated air temperature and radiation intensity are used another calculations that indicate the thermal influence from the fire name to the extruder or neighboring drums. About second fire incident, calculated result indicates first fire occurred from the No.30104 drum that was produced in 30B or several drums including No.30104 drum. It is estimated that temperature and thermal runaway reaction was not due to fire of neighboring drum because the drum doesn't receive large influence thermally by radiation from the neighboring fire name. Each result suggests the all burnt 29B and 30B drums were filled at higher temperature than usual.

Comparison between a steady-state fusion reactor and an inductively driven pulse reactor

*; Horiike, Hiroshi; Kuroda, Toshimasa*; Matsuzaki, Yoshimi; Shimomura, Yasuo; Sugihara, Masayoshi

JAERI-M 92-056, 53 Pages, 1992/04

JAERI-M-92-056.pdf:1.22MB

no abstracts in English

A Study on the safety of geological disposal of nitrate-containing waste, 2; Examination of safety by the temperature simulation

Nonaka, Kosuke; Mihara, Morihiro; Hara, Keiji*; Tochiyama, Osamu*

no journal, , 

In the case of nitrate-containing waste with organic material (Asphalt waste), thermal runaway reaction might be caused by chemical reaction of nitrate and organic material. In the geological disposal of Asphalt waste, investigation of thermal runaway reaction is important. The temperature that causes thermal runaway reaction (SIT: Self-heating Ignition Temperature) was calculated using the temperature simulation.

Introduction of heat storage power plants and the maintenance technologies

Nishimura, Akihiko; Okazaki, Toru*

no journal, , 

no abstracts in English