[1L11-15] Inventory Evaluation Technology

4:35 PM - 4:50 PM JST(7:35 AM - 7:50 AM UTC)

[1L15] Assessment of contamination distribution of “Monju”(6) Assessment of activation of the ex-vessel fuel transfer machine

*Yotaro Kawaguchi¹, Takuma Kinoshita¹, Yasufumi Kishimoto¹, Shotaro Hanaki², Ryutaro Mashimo², Hayashi Hirokazu² (1. NESI, 2. JAEA)

Keywords:

Fast Reactor,Monju,Decommissioning,Characterization,Fuel handling,Activation

Dismantling in radiation-controlled area is planned in phase 3 of the “Monju” decommissioning program, but an assessment of contamination of the facilities is essential before starting the dismantling. The Ex-Vessel fuel Transfer Machine, a unique facility of “Monju” that transfers core components between other fuel handling facilities. Due to neutrons generated from fuel, the structural materials are activated.The radioactivity of the ex-vessel fuel transfer machine was assessed using the same methodology as the reactor’s evaluation. The neutron flux distribution and activation levels were evaluated using a 2D RZ system. Additionally, it was confirmed that the activity of activation products is at most at L3 levels, and in most areas, it is below the clearance levels.