Titanium tube fracture occurs during the half-side operation of a nuclear steam turbine condenser

the failure analysis is judged as the fatigue fracture caused by the fluid elastic excitation. Furthermore

from the aspects of fluid excitation and vibration response of the tube bundle

the effects of steady state and transient excitation on the vibration of the titanium tube are studied during the half-side operation of condenser. It is concluded that fluid elastic excitation is easily induced by higher load and emergency drain during the half-side operation of condenser. According to the characteristics of the tube bundle design of the condenser

the titanium tube in the sensitive region of excitation is treated with pipe plugging and adding anti-abrasive strips. And the maximum steam turbine load allowed for half-side operation is optimized. In addition

the half-side operation of the condenser may cause the static and dynamic friction between the turbine low-pressure rotor and the end of the steam seal

which can be solved by running-in.