Design and safety assessment of cooling facilities for air system

Asano, Norikazu; Nishimura, Arashi; Takabe, Yugo; Araki, Daisuke; Yanai, Tomohiro; Ebisawa, Hiroyuki; Ogasawara, Yasushi; Oto, Tsutomu; Otsuka, Kaoru; Otsuka, Noriaki; et al.

JAEA-Technology 2021-045, 137 Pages, 2022/06

JAEA-Technology-2021-045.pdf:2.97MB

A collapse event of a cooling tower for secondary cooling system in the Japan Materials Testing Reactor (JMTR) was caused by the strong winds of Typhoon No.15 on September 9, 2019. As measures against the event, the working group for the renewal of the UCL (Utility Cooling Loop) cooling tower was established in the department of JMTR, and the integrity of the UCL cooling tower, which is the same type of wooden cooling tower as the secondary cooling tower in the JMTR, was investigated. As a result of this investigation, we have decided to replace the existing UCL cooling tower with a new cooling system. After investigations, in order to reduce the risk of collapse due to wood decay, the new cooling system was installed as a component of the air system to be managed as a performance maintenance facility after decommissioning. This report describes the design of and the evaluation results of the facility.

Preliminary study on the selection of appropriate zeolite for refining chlorides melt

Amamoto, Ippei; Myochin, Munetaka; Hayashi, Shigeo*; Ogasawara, Masataka*; Kato, Sumio*; Nakata, Shinichi*

no journal, , 

Zeolites as functional materials, possessing various excellent actions, have been developed widely their use in the general industrial circles. The objective of this study is to apply their good properties, i.e. the sorptive action and heat resistance to refine the chlorides melt called "spent electrolyte" generated during pyroreprocessing in the nuclear industrial field. Preliminary experiment was carried out to select a higher sorptive efficiency zeolite. The result found Faujasite as well as LTA potentially good FP sorbent. Trough continued investigation, technical development toward zeolites' greater occluding ability of FP and its stability will be our next step.