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Sakaguchi, Shinobu; Tachibana, Ikuya; Koshino, Katsuhiko; Shirozu, Hidetomo; Shirai, Nobutoshi; Imamoto, Nobuo; Tomita, Tsuneo; Tobita, Hiroo; Yamanaka, Atsushi; Kobayashi, Daisuke; et al.
JAEA-Technology 2011-006, 24 Pages, 2011/03
JAEA-Technology-2011-006.pdf:3.07MB
In the Niigataken Chuetsu-oki Earthquake on 2007, observed earthquake motion exceeded design base at the Kashiwazaki Kariwa nuclear plant. However, there was no earthquake damage in safety important equipments to stop reactor, to cool reactor, and to contain radioactive materials. One of this reason is said that many safety margin are included in the design and the permissible value. To know more accurate safety margin, shearing force examinations for the base bolts were conducted. In examinations, delegate test-bolts were made; the test bolts were selected from heavier equipment in Tokai Reprocessing Plant. In this report, the shearing strength obtained from the examinations shows more accurate safety margin.
Kishi, Yoshiyuki; Yasuda, Takeshi; Tokoro, Hayate; Yamanaka, Atsushi; Tsutagi, Koichi; Shirato, Yoji; Tanaka, Hitoshi
no journal, ,
High active liquid waste is stored in the facility equipped with cooling system and hydrogen scavenging system because of hydrogen generation due to radiolysis, and heat generation due to decay heat. The facilities related to these systems maintenance have been designed to be fed by emergency power generators in the conventional design. In addition to that, in light of the lessons learned from accident at the Fukushima Daiichi Nuclear Power Plant, we took safety measures for emergencies such as securement of the power supply system from power source vehicle to enable a quick recovery in the case of station black out in the Tokai Reprocessing Plant.
Ouchi, Masayuki; Samoto, Hirotaka; Kishi, Yoshiyuki; Isobe, Hiroyasu; Yasuda, Takeshi; Yada, Yuji; Suzuki, Shohei; Tokoro, Hayate; Kusaka, Shota; Shoji, Keita
no journal, ,
Tokai Reprocessing Plant (TRP) retained nuclear materials such as spent fuel sheared powder, plutonium solution, and uranium solution due to TRP shift to decommissioning in anticipation of resuming reprocessing. Flush-out to sequentially remove these nuclear fuel materials was required for future decommissioning of equipment. U solution was denitrified to UO
powder as the final stage of flush-out, stored in the uranium storage. We performed inspections and training, simultaneously transferring technical knowledge to young engineers. Safe and stable processing was achieved by establishing conditions that could treat lower-concentration U solution and prevent nozzle clogging. Additionally, by denitrifying the diluted U solution in the feed tank, the washing waste was significantly reduced. Through these efforts, flush-out for TRP was successfully completed.
Shirato, Yoji; Isozaki, Toshihiko; Kishi, Yoshiyuki; Isobe, Hiroyasu; Nakamura, Yoshinobu; Uchida, Toyomi; Seno, Shigeo
no journal, ,
no abstracts in English
Shirato, Yoji; Yamanaka, Atsushi; Tsutagi, Koichi; Yoshino, Yasuyuki; Kishi, Yoshiyuki; Isobe, Hiroyasu
no journal, ,
no abstracts in English
O and ZrO containing CrO-CoO-AlO-FeO-PO
glassesYano, Tetsuji*; Kishi, Tetsuo*; Nakata, Yoshiyuki*; Kofuji, Hirohide; Takeuchi, Masayuki
no journal, ,