Study on engineering technologies in the Mizunami Underground Research Laboratory; FY2012 (Contract research)

Fukaya, Masaaki*; Noda, Masaru*; Hata, Koji*; Takeda, Yoshinori*; Akiyoshi, Kenji*; Ishizeki, Yoshikazu*; Kaneda, Tsutomu*; Sato, Shin*; Shibata, Chihoko*; Ueda, Tadashi*; et al.

JAEA-Technology 2014-019, 495 Pages, 2014/08

JAEA-Technology-2014-019.pdf:82.23MB

The researches on engineering technology in the Mizunami Underground Research Laboratory (MIU) plan consists of (1) research on engineering technology deep underground, and (2) research on engineering technology as a basis of geological disposal. The former research is mainly aimed in this study, which is categorized in (a) development of design and construction planning technologies, (b) development of construction technologies, (c) development of countermeasure technologies, and (d) development of technologies for security. In this study, the researches on engineering technology are being conducted in these four categories by using data measured during construction as a part of the second phase of the MIU plan.

Research and development of nuclear fusion

Ushigusa, Kenkichi; Seki, Masahiro; Ninomiya, Hiromasa; Norimatsu, Takayoshi*; Kamada, Yutaka; Mori, Masahiro; Okuno, Kiyoshi; Shibanuma, Kiyoshi; Inoue, Takashi; Sakamoto, Keishi; et al.

Genshiryoku Handobukku, p.906 - 1029, 2007/11

no abstracts in English

Investigation of in-reactor cesium chemical behavior in TEPCO's Fukushima Daiichi Nuclear Power Station accident, 8; Behavior of Si in oxide layer on stainless steel

Zheng, L.*; Hosoi, Kazuya*; Ueda, Shigeru*; Gao, X.*; Kitamura, Shinya*; Kobayashi, Yoshinao*; Osaka, Masahiko

no journal, , 

Si source for Cs-bearing particle formed by Fukushima-Daiichi NPS accident has yet to be revealed. Stainless steel is possible Si source since it is used as structure material in the reactor and includes Si. In this study, Si vaporization behavior was evaluated by investigation of Si behavior in oxide layer formed in steam atmosphere at 1473 K.

Clarification of debris formation conditions on the basis of the sampling data and experimental study using simulated fuel debris, 6; Evaluation of damage by reaction between metallic debris and structural materials in lower plenum

Nagae, Yuji; Sato, Takumi; Ito, Ayumi*; Ueda, Shigeru*

no journal, , 

We summarized the results of small-scale tests conducted at Tokyo Tech, Tohoku Univ. and JAEA, and will report the results of evaluating damage behavior of lower plenum by metal debris during severe accident. Molten Zr concentration contributed to the reactivity with the structure and to the reaction with oxide debris during the formation of the molten metal pool. Although Zr concentration tends to decrease due to various reactions, there is a possibility that metal debris with low oxygen concentration might form a molten pool at the pedestal. If the metal debris would have a high zirconium concentration, it might cause a eutectic reaction with the structural materials. In contrast, if Zr concentration would be low, the reaction with the structural material could be limited, and thermal damage and creep damage due to temperature rise are considered to be dominant.