A decommissioning process for decommissioning items in a swimming pool

Abstract

The invention discloses a reactor pool parts removing technology for swimming pool reactor decommissioning, comprising the following steps: (1) the water in a reactor pool is discharged to keep the water 1m higher than the top of a bracket in an active area; (2) non-fixed items in the reactor pool are removed and hoisted out for cutting and dismantling; (3) fixed parts inside the reactor pool are cut and dismantled; (4) sediments at the bottom inside the reactor pool are collected and removed; (5) the surface of the reactor pool is decontaminated; and (6) the reactor pool is filled with water and covered with a temporary cover plate. According to the removing technology disclosed by the invention, a remote control demolition robot and a power manipulator work together, and the existing items in a reactor pool with three-meters-deep water can be cleared and demolished safely under remote control. The existing items in a reactor pool can be demolished safely and smoothly, the exposure dose of operators is reduced, and the demolished waste can be handled in a classified way in accordance with relevant radioactive waste management regulations of our country.

Description

technical field [0001] The invention belongs to the field of decommissioning of nuclear facilities, and in particular relates to a process for removing internal components of a reactor pool when a swimming pool reactor is decommissioned. Background technique [0002] The swimming pool stack is a non-uniform swimming pool stack using U-235 fuel elements, using deionized water as a moderator, and metal beryllium and graphite as a reflective layer. The swimming pool pool and existing items in the pool have the following characteristics: [0003] 1) The pool is an oval container with a length of 4.5m, a width of 2m and a depth of 7.8m; [0004] 2) The existing items in the pool are divided into two types: non-fixed and fixed, and there are various types. Non-fixed items include uranium-235 target barrels, lead shielding plates, control rod guide tubes, ionization chamber pipes, vertical test pipes, beryllium boxes, graphite boxes and graphite boxes, storage racks of various spe...

AI Technical Summary

Problems solved by technology

[0006] Through technical research at home and abroad, we learned that although the remote-controlled demolition robot and the remote-controlled power manipulator have been applied in the decommissioning of nuclear facilities, they are both used alone, and there is no precedent for the simultaneous use of the two in the same situation.

The single use of these two devices has certain defects and cannot meet the needs of safe and smooth removal