Patent ID: 9524803
Filing Date: 2016-12-20
CPC Classification: G21C,Y02E

Claim Text:
1. A nozzle stub working system for a reactor vessel that performs work inside a nozzle stub protruding outward from a side surface of the reactor vessel and allowing the inside and the outside of the reactor vessel to communicate with each other, the nozzle stub working system for the reactor vessel comprising: a platform unit that is provided at an upper portion inside the reactor vessel, of which the upper portion is opened by separating an upper structure and an inner structure therefrom, and includes a substantially cylindrical side wall portion and a bottom portion blocking the lower end of the side wall portion; an access window that is provided at the side wall portion of the platform unit to allow the inside of the platform unit to communicate with the nozzle stub; an access window moving device that opens and closes the access window; a working device that advances from the inside of the platform unit to the inside of the nozzle stub to perform work inside the nozzle stub; a working floor that is provided above the reactor vessel; an elevating device that elevates the working device from the working floor into the platform unit; a moving device that is provided inside the platform unit, configured to send and receive the working device between the moving device and the elevating device inside the platform unit, configured to separably attach the working device thereto, and configured to move the working device attached to the moving device between predetermined positions of the nozzle stub and the inside of the platform unit; and a control device that is provided at the outside of the reactor vessel and controls the access window moving device and the working device, the elevating device, and the moving device, wherein the moving device includes: wherein the control device drives the access window moving device to open the access window, drives the working device to perform work inside the nozzle stub, and then drives the access window moving device to close the access window after the performance of the work, wherein the first moving unit is provided with a lower plate and a plurality of upper plates having a first upper plate and a second upper plate, the first upper plate being arranged on the lower plate, the second upper plate being arranged on the first upper plate, and the first moving unit adjusts a position of the working device relative to the nozzle stub by sliding the first upper plates with respect to the lower plate and sliding the second upper plate with respect to the first upper plate, wherein the control device drives the elevating device to drop the working device into the platform unit, and wherein the control device drives the moving device.