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Journal Articles

Comparative methodology between actual RCCS and downscaled heat-removal test facility

Takamatsu, Kuniyoshi; Matsumoto, Tatsuya*; Liu, W.*; Morita, Koji*

Annals of Nuclear Energy, 133, p.830 - 836, 2019/11

A RCCS having passive safety features through radiation and natural convection was proposed. The RCCS design consists of two continuous closed regions: an ex-reactor pressure vessel region and a cooling region with a heat-transfer surface to ambient air. The RCCS uses a novel shape to remove efficiently the heat released from the RPV through as much radiation as possible. Employing air as the working fluid and ambient air as the ultimate heat sink, the RCCS design can strongly reduce the possibility of losing the working fluid and the heat sink for decay-heat-removal. Moreover, the authors started experiment research with using a scaled-down heat-removal test facility. Therefore, this study propose a comparative methodology between an actual RCCS and a scaled-down heat-removal test facility.

Journal Articles

Improvement of heat-removal capability using heat conduction on a novel reactor cavity cooling system (RCCS) design with passive safety features through radiation and natural convection

Takamatsu, Kuniyoshi; Matsumoto, Tatsuya*; Liu, W.*; Morita, Koji*

Annals of Nuclear Energy, 122, p.201 - 206, 2018/12

 Percentile:100(Nuclear Science & Technology)

A RCCS having passive safety features through radiation and natural convection was proposed. The RCCS design consists of two continuous closed regions: an ex-reactor pressure vessel region and a cooling region with a heat-transfer surface to ambient air. The RCCS uses a novel shape to remove efficiently the heat released from the RPV through as much radiation as possible. Employing air as the working fluid and ambient air as the ultimate heat sink, the RCCS design can strongly reduce the possibility of losing the working fluid and the heat sink for decay-heat-removal. This study addresses an improvement of heat-removal capability using heat conduction on the RCCS. As a result, a heat flux removed by the RCCS could be doubled; therefore, it is possible to halve the height of the RCCS or increase the thermal reactor power.

Journal Articles

Experimental study on heat removal performance of a new Reactor Cavity Cooling System (RCCS)

Hosomi, Seisuke*; Akashi, Tomoyasu*; Matsumoto, Tatsuya*; Liu, W.*; Morita, Koji*; Takamatsu, Kuniyoshi

Proceedings of 11th Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-11) (Internet), 7 Pages, 2018/11

A new RCCS with passive safety features consists of two continuous closed regions. One is a region surrounding RPV. The other is a cooling region with heat transferred to the ambient air. The new RCCS needs no electrical or mechanical driving devices. We started experiment research with using a scaled-down test section. Three experimental cases under different emissivity conditions were performed. We used Monte Carlo method to evaluate the contribution of radiation to the total heat released from the heater. As a result, after the heater wall was painted black, the contribution of radiation to the total heat could be increased to about 60%. A high emissivity of RPV surface is very effective to remove more heat from the reactor. A high emissivity of the cooling part wall is also effective because it not only increases the radiation emitted to the ambient air, but also may increase the temperature difference among the walls and enhance the convection heat transfer in the RCCS.

Journal Articles

New reactor cavity cooling system using novel shape for HTGRs and VHTRs

Takamatsu, Kuniyoshi; Hu, R.*

Proceedings of 10th International Topical Meeting on Nuclear Thermal Hydraulics, Operation and Safety (NUTHOS-10) (USB Flash Drive), 12 Pages, 2014/12

continuous closed regions; one is an ex-reactor pressure vessel (RPV) region and another is a cooling region having heat transfer area to ambient air assumed at 40 ($$^{circ}$$C). The RCCS uses novel shape so that the heat released from the RPV can be removed efficiently with radiation and natural convection. Employing the air as the working fluid and the ambient air as the ultimate heat sink, the new RCCS design greatly reduces the possibility of losing the heat sink for decay heat removal. Therefore, HTGRs and VHTRs adopting the new RCCS design can avoid core melting owing to overheating the fuels.

JAEA Reports

Engineering design of advanced marine reactor MRX

JAERI-Tech 97-045, 601 Pages, 1997/10

JAERI-Tech-97-045.pdf:17.47MB

no abstracts in English

Journal Articles

Analyses for passive safety of fusion reactor during Ex-vessel loss of coolant accident

Honda, Takuro*; *; *; *; Seki, Yasushi; Aoki, Isao; Kunugi, Tomoaki

Journal of Nuclear Science and Technology, 32(4), p.265 - 274, 1995/04

 Times Cited Count:8 Percentile:34.57(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Progress of light water reactors and their future subjects

Murao, Yoshio

Genshiryoku Kogyo, 41(1), p.31 - 35, 1995/00

no abstracts in English

Journal Articles

Improvement of passive safety of reactors

Asahi, Yoshiro; ; *

Nuclear Science and Engineering, 96, p.73 - 84, 1987/00

 Times Cited Count:3 Percentile:45.45(Nuclear Science & Technology)

no abstracts in English

Oral presentation

Reactor Cavity Cooling System (RCCS) having passive safety features

Takamatsu, Kuniyoshi; Matsumoto, Tatsuya*; Morita, Koji*

no journal, , 

After the accident at the Fukushima NPPs, measures to prevent core damage in terms of defense in depth had become more and more important. Researches regarding cooling system having novel safety features are crucially essential subjects. Therefore, a new Reactor Cavity Cooling System (RCCS) having passive safety features is proposed. The RCCS does not require active cooling systems and never lost heat sink in the same way as the accident at the Fukushima NPPs. The RCCS can become a base load cooling system like a base load power station and remove a part of emissive heat in rated operation and a part of decay heat after reactor shutdown, constantly, stably and passively.

Oral presentation

Advancement of detailed core bowing analysis code for fast reactor, 1; Validity of calculation model by IAEA benchmark analysis

Ota, Hirokazu*; Ohgama, Kazuya; Yamano, Hidemasa

no journal, , 

no abstracts in English

Oral presentation

Investigation on heat transfer characteristics of reactor cavity cooling system for HTGR

Akashi, Tomoyasu*; Hosomi, Seisuke*; Ifuku, Hiroki*; Matsumoto, Tatsuya*; Liu, W.*; Morita, Koji*; Takamatsu, Kuniyoshi

no journal, , 

A new RCCS with passive safety features consists of two continuous closed regions. One is a region surrounding RPV. The other is a cooling region with heat transferred to the ambient air. The new RCCS needs no electrical or mechanical driving devices. We started experiment research with using a scaled-down test section. Three experimental cases under different emissivity conditions were performed. We used Monte Carlo method to evaluate the contribution of radiation to the total heat released from the heater. As a result, after the heater wall was painted black, the contribution of radiation to the total heat could be increased to about 60%. A high emissivity of RPV surface is very effective to remove more heat from the reactor. A high emissivity of the cooling part wall is also effective because it not only increases the radiation emitted to the ambient air, but also may increase the temperature difference among the walls and enhance the convection heat transfer in the RCCS.

11 (Records 1-11 displayed on this page)
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