[2D13-17] Decommissioning Technology for Fukushima 2

[2D15] Development for Dust Evaluation Method during Fuel Debris Retrieval Operations

(2)Estimation for dusts generated by disc saw cutting

*chiaki SHIMODA^1,2, yasuhiro YUGUCHI^1,2, jun SUZUKI^1,2, kenji KURIHARA^1,2 (1. IRID, 2. TOSHIBA ESS)

Keywords:Decommissioning, Fuel debris, Dust, Cutting, Particle size distribution, Fuel debris retrieval

Dust particles in various sizes spread around a working point in cutting, handling and so on during fuel debris retrieval operations in the Primary Containment Vessel (PCV) in Fukushima Daiichi Nuclear Power Plant. It is required to develop a dust diffusion evaluation and prevention system in order to reduce radiation exposure to the workers. The purpose is to evaluate the dust transfer rates from a cutting point to the air, the bottom, or exhaust ventilation. The dust particle size distribution and behavior when a stainless steel was cut with a disc saw are presented.