| 摘要 |
<p>The invention relates to a method for removal of pressure tubes and calandria tubes from a nuclear reactor. According to the invention, the method comprises severing, in a first step, the pressure tube inwards each of first and second bell shaped end portions of the calandria tube to form a main pressure tube portion between first and second severed pressure tube end portions, each of them still adjoining a respective one of the first and second end connections, followed by removing the first end connection together with the pressure tube end portion first severed from one end shield of the calandria vessel and removing the second end connection together with the adjoining pressure tube end portion second severed from another end shield of the calandria vessel, and, in a third step, severing the calandria tube outwards the main pressure tube portion and inwards the second bell shaped end portion to form a main calandria tube portion and a severed calandria tube end portion wherein the main pressure tube portion is positioned within the main calandria tube portion and finally removing from one end shield of the calandria vessel the main calandria tube portion together with the main pressure tube portion, and removing from the other end shield of the calandria vessel the severed calandria tube end portion.</p> |
