OP 3323A cautions the operators that “prolonged operation with the exhaust hood temperatures within the exhaust hood desuperheating spray control range should be avoided”.
What is the basis of this precaution?
excessive use of sprays can cause erosion of the LP turbine last stage buckets
What difference if any exists in construction or design between the four turbine main stop valves?
The #2 MSV contains an internal bypass valve to permit warming of below seat areas and control valves for chest warming
Why is operation of the main turbine/generator turning gear minimized?
minimize copper dusting in the main generator rotor windings
Which of the following accurately describes the function of the moisture Seperators?
the moisture separators convert the low pressure saturated steam exhausted from the HP main turbine into low pressure superheated steam for use by the LP main turbines and turbine driven main feedwater pumps
What will be the steam flowpath through the main turbine during the performance of shell warming?
through only the #2 main turbine stop valve, through all main turbine control valves, into the HP turbine and MSRs, up to the CIVs, which are closed
What will be the steam flowpath through the main steam piping during the performance of chest warming?
through only #2 main turbine stop valve, up to all of the main turbine control valves, which are closed
Which of the following feedwater heater components is designed to prevent steam from the feedwater heaters causing turbine overspeed following a turbine trip?
non-return check valves
What extraction steam system (ESS) components reposition on a main turbine trip?
ESS non-return valves CLOSE and drains from ESS are directed to condenser
The CR is swapping gland exhaust fans. After the swap, what will packing exhaust vacuum be adjusted to?
10 to 20 inches H2O vacuum
