[1L11-15] Inventory Evaluation Technology

3:35 PM - 3:50 PM JST(6:35 AM - 6:50 AM UTC)

[1L11] Decommissioning of Hitachi Training Reactor (HTR)(1)General overview of the Decommissioning

*Yuko Suzuki¹, Kuniaki Nabatame², Tomoharu Hashimoto², Ryuichi Tayama², Mitsuru Uetake¹, Tomonori Ozawa¹, Hideho Gamo¹ (1. Hitachi, 2. HGNE)

Keywords:

decommissioning,demolition

Hitachi Training Reactor (HTR) is a research reactor, which has achieved initial criticality in 1961 and has finished its operation in 1975. The main facilities such as the reactor core, reactor cooling system, etc. are dismantled as soon as the operation was completed, and the demolition waste continues to be stored in the reactor building until a few years ago. In the original plan, immediately after the radioactive waste was discharged, all the remaining buildings and radioactive concrete near the core were suppose to dismantle. However, by changing the plan, the radioactive waste is stored for a long time in our facility until its destination is decided, and in order to reduce the control area, unused buildings, etc. are decided to disassemble in appropriate order. This report describes the details of decommissioning under the new plan.