In the previous problem (see Exercise 14.1), the reader was
asked to nd the void fraction of the coolant of at the top of a BWR fuel
assembly (i.e., the volume of the coolant α that was converted into
steam). Now suppose that we would like to know what percentage of the total
mass of the coolant is converted into steam at this point. What is this percentage
called, and what is its value at the top of the core (z = H)?
Assume that the average density of the coolant exiting a BWR
fuel assembly is 0.155 g/cm3. What fraction of the total volume of the coolant
has been converted into steam at the exit of the fuel assembly in this case?