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ship con ii > M2 Test Info > Flashcards

M2 Test Info Flashcards

1
Q

_________ – less dense – fewer collisions likely – less fission

A

Warm

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2
Q

nuclear reactors use water as a _____ and ______

A

moderator and coolant

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3
Q

Has a flap-type mechanism pinned at the top on one side allowing pivot up and down

A

Horizontal Swing Check Valves

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4
Q

three items contained within the reactor core

A

Fuel
Moderator
Coolant

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5
Q

number of thermalized neutrons per unit volume

A

thermal-neutron flux

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6
Q

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

A

Butterfly Valves

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7
Q

_______ – more dense – more collisions likely – more fission

A

Cool water

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8
Q

required amount of fuel needed to sustain the fission chain reaction

A

Critical Mass

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9
Q

difference between actual mass and atom’s mass number

A

mass defect

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10
Q

two possible consequences of allowing coolant to flash into steam in the primary loop?

A

The reactor coolant pump will cavitate.
The fuel in the reactor will melt.

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11
Q

the rate of fission is decreasing

A

Subcritical

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12
Q

Directs the flow of reactor coolant

A

Reactor Vessel

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13
Q

______ is good for moving viscous liquids where a LOW FLOW RATE is required

A

Gear Pumps

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14
Q

chain reaction is barely maintained

A

Critical

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15
Q

Emergency shutdown of the reactor is called a ____

A

SCRAM

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16
Q

______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

A

Horizontal Lift Check Valves

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17
Q

_______ quickly stabilize and pose little biological hazard unless ingested

A

Alpha particles

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18
Q

As fuel depletes over core life the control rods have to ___________

A

withdraw further and further to attain criticality

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19
Q

Nuclear Reactor Fuel =

A

uranium

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20
Q

Green is for …..

A

Sea water, Diesel Sea Water, Brine

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21
Q

the rate of fission is increasing

A

Supercritical

22
Q

number of protons and electrons in a neutrally charged atom

A

Atomic Number

23
Q

Cyan is for …..

A

Reactor Water

24
Q

total number of nucleons (protons +neutrons)

A

Mass Number

25
Q

______ Shielding needed to prevent biological hazard

A

Beta particles

26
Q

Blue is for …..

A

Fresh Drinking Water, Reactor Plant

27
Q

Prevent over pressurization of the system

A

Relief Valves

28
Q

_______ has impellers with blades (or vanes) mounted on a shaft

A

Centrifugal Pumps

29
Q

____ is used for moving high viscosity liquids like fuel oil and lube oil

A

Positive Displacement Pumps

30
Q

_________High frequency, short wave length Pose a significant biological hazard without proper shielding

A

Gamma rays

31
Q

Maintains coolant at approximately 2000 psig

A

Pressurizer

32
Q

Ball seats in a socket inside the valve and shuts off the flow in a system when turned perpendicular to the line of the pipe

A

Ball Valves

33
Q

Most common types of stop valves

A

Globe Valves

34
Q

reduces radiation levels inside the reactor compartment

A

Shielding

35
Q

Two types of pumps..

A

Centrifugal Pumps
Positive Displacement Pumps

36
Q

Pump used for moving low viscosity liquids

A

Centrifugal Pumps

37
Q

Can instantly release the control rods in an emergency

A

Control Rod Drive Mechanism (CRDM)

38
Q

Physically displace liquid using rotating elements (screw or gear) or reciprocating element (piston)

A

Positive Displacement Pumps

39
Q

fuel needed over the lifespan of the reactor

A

Excess critical mass

40
Q

3 non-directional valves

A

Butterfly, Gate, Ball

41
Q

Purple is for …..

A

Jet Fuel Systems (JP5)

42
Q

Provide fine adjustments in fluid flow in a system

A

Needle Valves

43
Q

Gate connected to a stem that raises and lowers; Not to regulate flow

A

Gate Valves

44
Q

Our Nuclear Reactors are ____ _____ _______

A

pressurized water reactors

45
Q

attached to the closure head and drives the rods up and down in the reactor core

A

Control Rod Drive Mechanism (CRDM)

46
Q

Keep thermal neutron flux at the desired level

A

Control Rods

47
Q

the time required for an atom to give up half its energy is called

A

half-life

48
Q

_____ is used when a HIGHER FLOW RATE is required for viscous liquids

A

Screw Pumps

49
Q

_____ is thin layer of metal that forms a corrosion-resistant layer to protect the fuel from the reactor coolant

A

Cladding

50
Q

good moderator has:

A

high scattering cross-section
low absorption cross-section
mass close to that of the neutrons

51
Q

smallest particle of an element that possesses all physical characteristics of that element

A

Atom

52
Q

______ keep the thermal-neutron flux at the desired level

A

Control Rods

ship con ii (9 decks)

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