Pressurised water reactor is designed________________?

Pressurised water reactor is designed________________?

A. for boiling pi water in the core
B. to use liquid sodium metal as coolant
C. to use intermediate coolant
D. to prevent the water coolant from boiling in the core
E. to eliminate the coolant loop of the pressurised water

In order to have constant clain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be________________?

In order to have constant clain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be________________?

A. greater than 1.0
B. less than 1.0
C. equal to zero
D. equal to 1.0
E. equal to infinity