Analysis of water slug impact (water hammer) in steam pipes of NPP

A severe water hammer can happen by water entrapped in steam pipe. Consequently, pipe or its components and restraints can be damaged and its function can be lost. This kind of water hammer is a potential danger for safety operation of power plants, especially nuclear power plants. This paper briefly describes generating of water slug and the calculation method for water slug impact force on piping bend, and gives a practical example of the calculation