Method for making orifices in the secondary casings of a pressurized water reactor steam generator
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United States of America Patent
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Issued Date -
May 14, 2009
app pub date -
Aug 5, 2008
filing date -
Aug 7, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
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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