2013 MCQ Flashcards
What potential do high temperature reactors with helium cooling show?
Hydrogen production
What is critical heat flux?
The heat flux at which nucleate boiling ceases to be an effective form of transferring heat from a solid surface to a liquid.
What is the unit of macroscopic cross section?
m-1
What is the unit for microscopic cross section?
m2
What is meant by ‘extrapolation length’?
The increase in notional core dimensions to improve the results of diffusion approximation
What is meant by a super-critical reactor?
One where neutron number densities are increasing
What requirements do PWR’s place on the design of the steam turbines that arenot placed on them by fossil-fuelled plant?
Need to be particularly tolerant of wet steam
At what axial location in the core of a PWR is film boiling of the coolant most likely to occur if the power were to be increased?
Between middle and exit
What is neutron flux?
Neutron number density x neutron speed
What is sintering?
process of compacting and forming a solid mass of material by pressure or heat without melting it to the point of liquefaction.
Order the following in ascending turbine entry temperature:
AGR
Modern coal fired power station
PWR
PWR
AGR
Modern coal fired power station
What does ‘fast ‘ refer to?
Speed of neutrons
How would a new rib design for an AGR which increases its heat transfer coefficient affect the rate of cladding oxidation?
Reduce
How to calculate rate of neutron production per generation?
SUM OF: v(i)sigma(i)N(i)
Can a reactor be critical and prompt-critical at the same time?
No
