| 摘要 |
The method consists in making sure that the steam generator (1) is full of water and topping it up if necessary, using mechanical tooling (15) to pierce a blind pre-orifice (22) into part of the thickness of the pressure boundary (2), lowering the water level in the steam generator (1) to just above the pre-orifice (22), using electrical discharge machining to finish piercing the orifice (9) in the pressure boundary (2), and using electrical discharge machining also to make an orifice (10) in the bundle wrapper (3).
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