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Journal Articles

Study of an HTGR and renewable energy hybrid system for grid stability

Sato, Hiroyuki; Yan, X.

Nuclear Engineering and Design, 343, p.178 - 186, 2019/03

 Times Cited Count:1 Percentile:34.57(Nuclear Science & Technology)

A hybrid system combining HTGR and renewable energy is investigated to compensate intermittent renewable energy power generation. A new proposal of using the inventory and bypass control devices already built in the gas turbine, is found to be effective to compensate hourly to daily variation of renewable energy. The reactor thermal power remains at constant full power while the heat output is increased or decreased subject to the need of reactor power generation. On the other hand, the massive heat capacity in the graphite core is shown to be sufficient to compensate renewable energy on a time scale of seconds to minutes and up to about 20% of the rated power output of the nuclear plant. Similarly, no additional control devices are required to perform this control operation. These findings demonstrate the technical and economic potential of the HTGR system to maintain the stability of a grid being incorporated with significant portfolios of renewable energy power generation.

Journal Articles

HTGR and renewable energy hybrid system for grid stability; Assessment of performance, economics and CO$$_{2}$$ reduction

Yan, X.; Sato, Hiroyuki

IAEA-TECDOC-1885, p.121 - 129, 2019/00

The present study proposes a HTGR renewable hybrid cogeneration plant which can contribute to a grid stability for large penetration of variable renewables. In addition, results of control simulations for representative load-following operations, economics assessment and CO$$_{2}$$ reduction assessment are provided.

Journal Articles

Dose estimation in recycling of decontamination soil due to Fukushima NPS accident as coastal levees

Takai, Shizuka; Sawaguchi, Takuma; Takeda, Seiji

Proceedings of International Waste Management Symposia 2018 (WM 2018) (Internet), 14 Pages, 2018/03

After the Fukushima Nuclear Power Station accident, large quantities of radiocesium-contaminated soil generated from decontamination activities have been stored in the Fukushima prefecture. To complete the final disposal of decontamination soil, the Ministry of the Environment of Japan presented policy to reduce the disposal volume by using low-level decontamination soil as recycled materials. The use will be limited to civil engineering structures in public projects, such as coastal levee and road embankment. However, there has been no example or safety assessment of recycling of decontamination soil. To contribute to guideline development for the recycling by the Ministry of the Environment, we conducted the safety assessment for recycling of decontamination soil as coastal levee. First, we evaluated additional doses to workers and the public in the case of construction and service of coastal levee. From the result, the radioactive cesium concentration level of recycled materials was derived to be 6,800 Bq/kg. For general designs of coastal levee in Japan, additional doses to the public in the case of service were below 0.01 mSv/y with derived radioactivity level. Finally, we confirmed additional doses in the case of disaster to be below 1 mSv/y.

Journal Articles

Challenges for enhancing Fukushima environment resilience, 6; The Use of the reclaimed materials derived from the removed soil on the basis of the security

Okada, Takashi; Takeda, Seiji; Nakata, Hisakazu

Nippon Genshiryoku Gakkai-Shi, 59(10), p.603 - 607, 2017/10

Because the reclaimed material is used, quantity of disposal of the removal soil can decrease. It is a strategic key to utilize the reclaimed material. As for this report, it is explained to about the fundamentals of the safe use of the reclaimed materials derived from the removed soil.

Journal Articles

Journal Articles

Challenges for enhancing Fukushima environmental resilience, 4; Development of physical and heat treatment methods on aiming at decontamination, volume reduction and reuse of contaminated soil

Yaita, Tsuyoshi; Honda, Mitsunori; Shimoyama, Iwao; Ito, Kenichi*; Mampuku, Yuzo*; Tsuji, Takuya; Matsumura, Daiju

Nippon Genshiryoku Gakkai-Shi, 59(8), p.483 - 487, 2017/08

no abstracts in English

Journal Articles

Sub-picosecond regenerative amplifier of Yb-doped Y$$_{2}$$O$$_{3}$$ ceramic thin disk

Maruyama, Momoko; Okada, Hajime; Ochi, Yoshihiro; Nagashima, Keisuke

Optics Express (Internet), 24(2), p.1685 - 1692, 2016/01

 Times Cited Count:4 Percentile:59.36(Optics)

We have developed a 1 kHz regenerative amplifier using an Yb:Y$$_{2}$$O$$_{3}$$ ceramic thin disk as the gain medium. Furthermore, the thermal conductivity and heat generation property of Yb: Y$$_{2}$$O$$_{3}$$ ceramic were investigated. In the developed regenerative amplifier, a laser beam is bounced off the thin disk six times in each round trip. The output energy is over 2 mJ, spectral bandwidth is 1.8 nm at FWHM, and pulse duration after pulse compression is 0.9 ps.

Journal Articles

Mechanical properties on multi stage blazed fin body with ultra fine off-set fin for compact heat exchager at Elevated Temperature

Ishiyama, Shintaro

Nippon Kinzoku Gakkai-Shi, 68(7), p.490 - 497, 2004/07

 Times Cited Count:0 Percentile:100(Metallurgy & Metallurgical Engineering)

SUS304 multi stage blazed fin core body for GTHTR300 was tested its high temperature strength, fatigue and creep and it was found that the body behaves as same strength of SUS304 material.

Journal Articles

Two-color chirped-pulse amplification in an ultrabroadband Ti:sapphire ring regenerative amplifier

Yamakawa, Koichi; Barty, C. P. J.*

Optics Letters, 28(23), p.2402 - 2404, 2003/12

 Times Cited Count:30 Percentile:22.37(Optics)

no abstracts in English

Journal Articles

All solid-state ultrashort-pulse laser by using ytterbiumu-doped materials

Nishioka, Hajime*; Kawanaka, Junji

Hikari Araiansu, 14(11), p.21 - 25, 2003/11

no abstracts in English

Journal Articles

30-mJ, diode-pumped, chirped-pulse Yb:YLF regenerative amplifier

Kawanaka, Junji; Yamakawa, Koichi; Nishioka, Hajime*; Ueda, Kenichi*

Optics Letters, 28(21), p.2121 - 2123, 2003/11

 Times Cited Count:71 Percentile:7.17(Optics)

no abstracts in English

JAEA Reports

Development of a high-energy, ultrabroadband Ti:sapphire ring regenerative amplifier

Yamakawa, Koichi

JAERI-Research 2003-017, 9 Pages, 2003/09

JAERI-Research-2003-017.pdf:0.93MB

We have developed a high-energy, ultrabroadband Ti:sapphire ring regenerative amplifier capable of producing in excess of 20mJ output at a 10Hz repetition rate. The technique of chirped-pulse amplification is used to generate two-color, time-synchronized pulses, with central wavelength separations up to $$sim$$ 120nm and with a total energy of 10mJ by using a regenerative pulse shaping technique.

Journal Articles

Study of power conversion unit design of Gas Turbine High Temperature Reactor (GTHTR300)

Takada, Shoji; Takizuka, Takakazu; Kunitomi, Kazuhiko; Yan, X.; Minatsuki, Isao*

Dai-31-Kai Gasu Tabin Teiki Koenkai Rombunshu, p.55 - 60, 2003/06

no abstracts in English

Journal Articles

Stress analysis of plate-fin type heat exchanger

Matsui, Shingo*; Muto, Yasushi*; Shiina, Yasuaki

Nippon Genshiryoku Gakkai Wabun Rombunshi, 2(2), p.175 - 186, 2003/06

no abstracts in English

Journal Articles

High temperature mechanical properties on multi stage blazed fin body with ultra fine off-set fin for compact heat exchanger

Ishiyama, Shintaro; Muto, Yasushi

Nippon Kikai Gakkai Rombunshu, A, 69(679), p.682 - 688, 2003/03

no abstracts in English

Journal Articles

Design study of power conversion system for the Gas Turbine High Temperature Reactor (GTHTR300)

Takada, Shoji; Takizuka, Takakazu; Kunitomi, Kazuhiko; Yan, X.; Katanishi, Shoji; Kosugiyama, Shinichi; Minatsuki, Isao*; Miyoshi, Yasuyuki*

Nippon Genshiryoku Gakkai Wabun Rombunshi, 1(4), p.341 - 351, 2002/12

no abstracts in English

Journal Articles

Immortal catalytic activity for cleaning up automotive emissions; Intelligent catalyst

Nishihata, Yasuo; Tanaka, Hirohisa*

SPring-8 Riyosha Joho, 7(6), p.359 - 363, 2002/11

Catalytic converters are widely applied to control automotive emissions, such as nitrogen oxides, carbon monoxide and unburned hydrocarbons. In actual catalysts, however, the catalytic activity deteriorates due to the particle growth of precious metals during vehicle use. An ageless catalyst is a kind of philosopher's stone in automotive engineering. Referring to the wisdom of ancient Indian philosophy and medical science, Ayur Veda, we have developed a new self-regenerating perovskite-based catalyst. The perovskite catalyst, LaFe$$_{0.57}$$Co$$_{0.38}$$Pd$$_{0.05}$$O$$_{3}$$, regenerates itself without any auxiliary treatment, in direct reaction to the natural fluctuation between reductive and oxidative atmospheres in the exhaust gas from state-of-the-art gasoline engines. As palladium reversibly moves back and forth between inside and outside of the perovskite crystal, the particle growth of palladium can be suppressed. Such a self-regeneration provides new insight into the development of future automotive catalyst, as an intelligent catalyst.

Journal Articles

Results and analysis of the ASTM round robin on reconstitution

Onizawa, Kunio; Van Walle, E.*; Pavirich, W.*; Nanstad, R.*

NUREG/CR-6777, 81 Pages, 2002/08

no abstracts in English

Journal Articles

Design of power conversion system of Gas Turbine High Temperature Reactor (GTGTR300)

Takada, Shoji; Takizuka, Takakazu; Kunitomi, Kazuhiko; Yan, X.; Katanishi, Shoji; Kosugiyama, Shinichi; Shiozawa, Shusaku

Nippon Kikai Gakkai Dai-8-Kai Doryoku, Enerugi Gijutsu Shimpojiumu Koen Rombunshu, p.189 - 192, 2002/00

no abstracts in English

Journal Articles

24-mJ, diode-pumped, chirped-pulse regenerative amplifier with a cooled Yb:LiYF$$_{4}$$

Kawanaka, Junji; Yamakawa, Koichi; Nishioka, Hajime*; Ueda, Kenichi*

Proceedings of Conference on Lasers and Electro-Optics / Quantum Electronics and Laser Science Conference (CLEO/QELS 2002), p.CPDC8_1 - CPDC8_3, 2002/00

no abstracts in English

64 (Records 1-20 displayed on this page)