Method and device for dismantling a control element of a boiling water reactor
A method and device enables dismantling of a control element of a boiling water reactor. Two control element leaves that are disposed opposite one another are separated by means of a roll-cutting method from the other two control element leaves, respectively along an intersection line extending in the longitudinal direction thereof and in the vicinity of the longitudinal center axis.
1 . A method of dismantling a control element of a boiling water reactor, the method which comprises:
providing a control element having a longitudinal center axis defining a longitudinal direction, and control element leaves including two first control element leaves disposed opposite one another relative to said longitudinal center axis and two second control element leaves disposed opposite one another relative to said longitudinal center axis;
separating said first control element leaves from said second control element leaves with a roll-cutting process and thereby cutting along a cutting line extending in said longitudinal direction and in a vicinity of said longitudinal center axis.
2 . The method according to claim 1 , which comprises forming a roll cut on each of two flat sides of each said first control element leaf using oppositely inclined cutting rolls.
3 . A device for dismantling a control element of a boiling water reactor, the control element having control element leaves with substantially flat sides opposite one another, the device comprising:
a guide for receiving the control element for movement, in relative terms, in the axial direction; and
a cutting unit with at least two cutting rolls which can each be placed onto the flat sides of two of the control element leaves located opposite one another.
4 . The device according to claim 3 , wherein said cutting unit has four cutting rolls disposed opposite one another in pairs.
5 . The device according to claim 3 , wherein said cutting rolls are hydraulically or electromechanically actuated cutting rolls.
6 . The device according to claim 3 , which comprises a frame supporting said cutting unit and surrounding the control element in a working position.
7 . The device according to claim 3 , wherein the control element has a longitudinal center axis, and four guide rolls are directed onto said longitudinal center axis for guidance on both sides of the cutting unit.