Improvement of the Simplified Decommissioning Cost Estimation Code for Nuclear Facilities (DECOST)

Takahashi, Nobuo; Kubota, Shintaro; Takiya, Hiroaki; Sakaba, Ryosuke*; Sato, Koichi; Shichi, Ryo

JAEA-Testing 2021-002, 106 Pages, 2022/01

JAEA-Testing-2021-002.pdf:2.08MB

The Japan Atomic Energy Agency has various nuclear facilities such as reactor facilities and reprocessing facilities. Some aged facilities will be decommissioned after their original functions ended, and it is necessary to evaluate their decommissioning cost to formulate the initial decommissioning plans and the final decommissioning plans. We have developed an evaluation method called DECOST that can efficiently calculate the decommissioning cost in a short time based on factors such as features and similarity of the facilities and dismantling methods. The decommissioning of nuclear facilities has been implemented and new achievements and findings have been reported since the development of DECOST. These findings were reflected in DECOST. In consideration of the needs of DECOST users, DECOST has been improved so that the cost of dismantling the facility can be divided into the cost of releasing the controlled area and the cost of dismantling the facility building after the release of the controlled area. This report shows the improvement of DECOST, the concept of resetting the evaluation coefficient used in the cost evaluation formula, and the validity of the evaluation coefficient after resetting. In addition, the evaluation procedure of the improved DECOST is described, since the evaluation items and evaluation contents were partially changed due to the improvement.

Investigation concerning radiation deterioration of panel made of plastic, 2

Kawakami, Akihiro; Suda, Shizuka; Shichi, Ryo; Iwabuchi, Hiroki

no journal, , 

The investigation concerning the radiation deterioration of the panel made of plastic set up for the expansion prevention of pollution (Part 2) was done in the maintenance area in the Tokai reprocessing plant shearing processing facilities.

Establishment of estimation approach of shearing force at TRP, 1; Study of estimation approach of shearing force

Suda, Shizuka; Shichi, Ryo; Iwabuchi, Hiroki

no journal, , 

no abstracts in English

Step of the improvement of incell- crane for mechanical process in Tokai Reprocessing Plant

Nanko, Masayuki; Ito, Shinichi; Shichi, Ryo; Iwabuchi, Hiroki

no journal, , 

Four cranes are installed in a cell in the shear processing process of the TRP. I experience various kinds of malfunction at first and, in the crane in these cells, report setting about step of the improvement that I performed to overcome them.

Maintenance results of fuel receipt and storage process at TRP

Takeyasu, Shinji; Shichi, Ryo; Iwabuchi, Hiroki

no journal, , 

no abstracts in English

Aging management of crane in cell at TRP

Horie, Koji; Kawakami, Akihiro; Ito, Shinichi; Sato, Shinji; Shimizu, Takenori; Shichi, Ryo

no journal, , 

no abstracts in English

Improvement of the fuel introduction conveyer of the Tokai Reprocessing Plant

Kuroda, Yasuji; Takeyasu, Shinji; Kawakami, Akihiro; Shichi, Ryo; Shimizu, Takenori

no journal, , 

The remote apparatus of the Tokai reprocessing facility head end process has aimed at improvement in safety and reliability, performing reprocessing operation. This report reports improvement of a fuel introduction conveyor which transports used fuel to the cell which is not carried out from a pool.