JOPSS - Search Results

Journal Articles

Forefront of nuclear reactor decommissioning; Toward Fukushima Dai-ichi NPS decommissioning, 1; Status and issues for technology development

Ogawa, Toru

Denki Gakkai-Shi, 138(8), p.518 - 521, 2018/08

https://doi.org/10.1541/ieejjournal.138.518

Technical issues for the accomplishment of the decommissioning of Fukushima Dai-ichi Nuclear Power Station are reviewed. Harsh radiation environment of 1F is summarized in comparison with the past decommissioning projects of Three Mile Island Unit-2 as well as JPDR. Needs for advancement in radiation management and remote technology are discussed.

Journal Articles

Challenge of decommissioning of Fukushima I Nuclear Power Plant, 4; Development of radiation resistant image sensor

Watanabe, Takashi*; Ozawa, Osamu*; Takeuchi, Tomoaki

Denki Gakkai-Shi, 138(8), p.529 - 534, 2018/08

https://doi.org/10.1541/ieejjournal.138.529

no abstracts in English

Journal Articles

Forefront of nuclear reactor decommissioning; Toward Fukushima Dai-ichi NPS decommissioning, 3; Visualization technology of radiation distribution under the decommissioning woks of the Fukushima Dai-ichi Nuclear Power Station

Torii, Tatsuo

Denki Gakkai-Shi, 138(8), p.525 - 528, 2018/08

https://doi.org/10.1541/ieejjournal.138.525

no abstracts in English

Journal Articles

Laser processing technology, 1; Innovative progress for atomic nuclear engineering

Daido, Hiroyuki

Denki Gakkai-Shi, 136(7), p.422 - 425, 2016/07

https://doi.org/10.1541/ieejjournal.136.422

no abstracts in English

Journal Articles

J-PARC linac

Hasegawa, Kazuo

Denki Gakkai-Shi, 130(11), p.739 - 741, 2010/11

https://doi.org/10.1541/ieejjournal.130.739

no abstracts in English

Journal Articles

Observation of the energetic radiation associated with a thunderstorm activity at the top of Mt. Fuji

Torii, Tatsuo; Sugita, Takeshi*; Tanabe, Sachiko*; Kimura, Yoshihisa*; Kamogawa, Masashi*; Yajima, Kazuaki*; Yasuda, Hiroshi*

Taiki Denki Gakkai-Shi, 3(1), p.111 - 112, 2009/00

Fluctuations of energetic radiation that were seemed to be caused by a summer thunderstorm activity were observed at the top of Mt. Fuji. The largest of such fluctuations was gradual and lasted for about 20 minutes, and was found to be high-energy rays having a continuous energy spectrum up to 10 MeV or more. As for the feature of these fluctuations, it seems naturally that such fluctuations are caused by the bremsstrahlung photons generated by the runaway electrons produced continuously with an intense electric field in the thundercloud rather than originated in the process of lightning discharge.

Journal Articles

Challenges in technology for attractive fusion energy

Tobita, Kenji

Denki Gakkai-Shi, 128(2), p.86 - 89, 2008/02

https://doi.org/10.1541/ieejjournal.128.86

This article describes fusion technology that will make fusion reactor attractive. Blanket technology has great impacts on producing high temperature coolant for multipurpose use of fusion energy and reducing the amount of radioactive waste. Another key technology is maintenance that enable us to replace in-vessel components in a short period as possible. For this purpose, it is necessary to increase the workload in the hot cell rather than the vacuum vessel.

Journal Articles

Generation of runaway electrons by atmospheric radionuclides in a thunderstorm electric field

Torii, Tatsuo; Sugita, Takeshi*

Taiki Denki Gakkai-Shi, 2(1), p.105 - 106, 2008/00

The influence of runaway electron generation by atmospheric radionuclides in a thunderstorm electric field is examined. The behavior of radiation emitted by radon, thoron and their decay products in the electric field was analyzed by Monte Carlo calculations. The results showed that a large amount of electron-ion pairs are produced in air when the electric field intensity exceeds 250 kV/m at the altitude of 2 km (about 320 kV/m at the sea-level equivalent pressure). Furthermore, the influence of the resuspension of fallout nuclides was analyzed because lightning activity after the Chernobyl nuclear accident increased in central Sweden where a considerable amount of nuclides fell. It is shown that, similar to natural radioactive nuclides, these nuclides significantly influence the ionization within the thundercloud.

Journal Articles

Observation of high energy radiation in winter thunderstorms

Torii, Tatsuo; Sugita, Takeshi*; Muraki, Yasushi*

Taiki Denki Gakkai-Shi, 1(2), p.73 - 74, 2007/00

The dose rate of the -rays increases in association with the activities of the winter thunderstorm. To investigate the time profile of the radiations during the winter thunderstorms, four sets of the radiation detectors were prepared which consist of the long proportional counters. Those results were compared with the results measured at the same time by the environmental radiation monitors set up around a nuclear power facility. Electric field was also measured by using a field mill. As a result, the following two types of the radiation enhancements have been found during the winter thunderstorm activities; the gradual variation of photon intensity with energy of a few MeV, and the burst type of the radiation that is attributed to the injection of high energy photons with the energy over 10MeV.

Journal Articles