Environmental remediation for the upstream of Yotsugi Mill Tailings Pond, Ningyo-toge Uranium Mine

Saito, Hiroshi; Sato, Yasushi*; Sakamoto, Atsushi*; Torikai, Kazuyoshi; Fukushima, Shigeru; Sakao, Ryota; Taki, Tomihiro

JAEA-Technology 2015-063, 119 Pages, 2016/03

JAEA-Technology-2015-063.pdf:86.2MB

Ningyo-toge Environmental Engineering Center has been conducting environmental remediation of the Ningyo-toge Uranium Mine, after decades of mine-related activities were terminated. Its purposes are to take measures to ensure safety and radiation protection from the exposure pathways to humans in future, and to prevent the occurrence of mining pollution. As part of the remediation, upstream part of the Yotsugi Mill Tailings Pond, the highest prioritized facility, has been remediated to fiscal year 2012. Multi-layered capping has been constructed using natural material, after specifications and whole procedure being examined in terms of long-term stability, radiation protection, economics, etc. Monitoring has been carried out to confirm the effectiveness of the capping, in terms of settlement, dose and radon exhalation rates, etc. Monitoring of drainage volume of penetrated rainwater is planned. Accumulated data will be examined and used for remediation of downstream part of the Pond.

Environmental remediation of the mill tailings pond in Ningyo-toge Mine

Sakao, Ryota; Saito, Hiroshi; Torikai, Kazuyoshi; Taki, Tomihiro

Journal of MMIJ, 130(6), p.275 - 278, 2014/06

http://ci.nii.ac.jp/naid/40020103151

Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency has been managing the Ningyo-toge Uranium Mine and Togo Uranium Mine in accordance with the Mine Safety laws. This paper shows a summary of the remediation activities of Mill Tailings Pond including the strategy and monitoring.

Operation report Ningyo-toge brick manufacturing plant

Yamawaki, Hiroyuki; Torikai, Kazuyoshi; Arimoto, Yosuke*

JAEA-Technology 2012-049, 64 Pages, 2013/03

JAEA-Technology-2012-049.pdf:8.28MB

An agreement was concluded among MEXT (Ministry of Education, Culture, Sports, Science and Technology), Tottori Prefecture, Misasa Town and JAEA (Japan Atomic Energy Agency) on May 31st, 2006, aiming at resolving the problem due to the waste soil deposited at JAEA's Katamo Waste Soil Yards. Based on the agreement, a plant was constructed in the land JAEA rented form the Misasa Town to manufacture bricks from the micture of the waste soil and additives such as cement. The plant manufactured about 1.45 million bricks during the period of operation between April 28th, 2008, and December 13th, 2010. This report summarizes the outline of the brick manufacturing plant, the results of trial and pilot operations and the performance of full-scale operation.