Patent ID: 8687758
Filing Date: 2014-04-01
Classification: G21C,G21D,Y02E

Abstract:
1. A method for managing a reactor pressure vessel, comprising: disposing an access apparatus at an inner surface of a bottom portion of the reactor pressure vessel, the access apparatus having an operation head hold member, and drive mechanisms for circular, radial, and vertical movements; disposing a cover apparatus for covering a plurality of individual internal instrumentation components penetrating the bottom portion at the inner surface of the bottom portion of the reactor pressure vessel, the cover apparatus being substantially cup shaped and covering the access apparatus and a sloped surface of the bottom portion; draining water that is present below the cover apparatus from the reactor pressure vessel, while water that exists above the cover apparatus in the reactor pressure vessel remains in place; forming an air environment below the cover apparatus by draining the water; pressing the cover apparatus on the inner surface of the bottom portion of the reactor pressure vessel by hydraulic head pressure added to the cover apparatus; lowering an operation head into the cover apparatus through a guide pipe attached on the cover apparatus; attaching the lowered operation head to the operation head hold member; setting the operation head by moving along the operation head hold member to one of the internal instrumentation components covered by the cover apparatus; and managing continuously the internal instrumentation components and the bottom portion which is below the cover apparatus by the set operation head, after the cover apparatus has been installed on the inner surface of the bottom portion, without removal of the cover apparatus between managing of each respective one of the plurality of instrumentation components.