This Standard includes practices that are concerned primarily with the prevention of water damage to steam turbines used for water-cooled nuclear reactor power generation. The practices cover design, operation, inspection, testing, and maintenance of those aspects of the following power plant systems and equipment concerned with the prevention of water induction into steam turbines and the safe removal of water from steam turbines and the following associated systems and equipment:

(a) main steam and bypass systems, piping, and drains
(b) turbine extraction systems, piping, and drains
(c) turbine steam seal systems, piping, and drains
(d) feedwater heaters, piping, and drains
(e) turbine drain systems
(f) condenser steam and water dumps
(g) start up systems

Any connection to the turbine is a potential source of water either by induction from external equipment or by accumulation of condensed steam. The sources treated herein specifically are those found to be most frequently involved in causing damage to turbines. Although water induction into the high- and intermediate-pressure turbines has historically been recognized as the most damaging, experience has shown that water induction in low-pressure turbines can cause significant damage and should also be taken seriously.

This Standard is not intended to impose new requirements for existing facilities retroactively.

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