M2 Test Info Flashcards
_________ – less dense – fewer collisions likely – less fission
Warm
nuclear reactors use water as a _____ and ______
moderator and coolant
Has a flap-type mechanism pinned at the top on one side allowing pivot up and down
Horizontal Swing Check Valves
three items contained within the reactor core
Fuel
Moderator
Coolant
number of thermalized neutrons per unit volume
thermal-neutron flux
Disc attached to a stem that rotates 90 degrees to open the system and then rotated back the opposite direction 90 degrees to close the system
Butterfly Valves
_______ – more dense – more collisions likely – more fission
Cool water
required amount of fuel needed to sustain the fission chain reaction
Critical Mass
difference between actual mass and atom’s mass number
mass defect
two possible consequences of allowing coolant to flash into steam in the primary loop?
The reactor coolant pump will cavitate.
The fuel in the reactor will melt.
the rate of fission is decreasing
Subcritical
Directs the flow of reactor coolant
Reactor Vessel
______ is good for moving viscous liquids where a LOW FLOW RATE is required
Gear Pumps
chain reaction is barely maintained
Critical
Emergency shutdown of the reactor is called a ____
SCRAM
______Performs same function as horizontal swing check valves with different valve operation; Ball or seat raises and lowers straight up and down to prevent backflow
Horizontal Lift Check Valves
_______ quickly stabilize and pose little biological hazard unless ingested
Alpha particles
As fuel depletes over core life the control rods have to ___________
withdraw further and further to attain criticality
Nuclear Reactor Fuel =
uranium
Green is for …..
Sea water, Diesel Sea Water, Brine