Abstract: At present, the methods of salvaging foreign objects in pools and pressure vessels of nuclear power plants in China mainly include heavy hammer sticking, water purification, vacuum suction. Each method has its own advantages and disadvantages, and is suitable for different working environments. Foreign objects are mainly generated in component pools, reactor pools, pressure vessels, spent fuel pools, etc., to which nuclear power plants have been paid close attention. They are analyzed, with some suggestions provided on the methods of salvaging that should be used. With the foreign objects in pressure vessels as an example, we analyze and discuss the salvage work from preparation to implementation, which focuses on the risk control in the process.

Key words: NPP pool, Pressure vessel, Foreign body, Salvage