αホットセル排気弁の運転中保全手法の確立
Establishment of maintenancemethod of exhaust valve ona-tight hot cell underventilating condition
著者:
水越 保貴 Yasutaka MIZUKOSHI 櫛田 尚也 Naoya KUSHIDA
発刊日:
公開日:
Hot cellHot laboratoryMaintenanceValve
概要
On a-tight hot cell under ventilating that has containment capability of nuclear materials, a safe and efficient maintenance method of exhaust valves which controlled negative pressure in hot cell was established at Fuels Monitoring Facility, Oarai Research and Development C enter, Japan Atomic Energy Agency.The hot cell which required the exhaust valve maintenance needed to stop the ventilating during maintenance work because the valves could not be removed from operating exhaust system. And it was made known from prior work evaluation that thi s method involved long-term work, much costs and radiation waste, and large work risk. Therefore, a new method of valve maintenance under ventilating was needed due to the reductions of work period, costs and work risk.So a provisional exhaust system for keeping negative pre ssure in hot cell without existing exhaust system operation was installed for the maintenance of these valves. By the application of this method, the reductions of work period, costs and radiation waste volume with maintenance were achieved to 1/3, 3/5 and 1/4, respectively.
