| 摘要 |
The appts. comprises a telescopic mast (8) (9) typically used to control nuclear fuel elements is moved longitudinally in a pool (5) by a bridge (2) which is carried on wheels (3) and rails (4). Transverse positioning is provided by a trolley (7) which carries the upper end of the mast. The verticality of the mast (8) (9) may be affected by routine operation and this is checked by attaching a control unit to the lower end of the mast and entering it into a template (12) which is located at a known position at the bottom of the pool and equipped with proximity indicators. |
