Radiological Aspects of Nuclear Plants.

Official practice quiz.

Select the characteristics below that describe a Boiling Water Reactor (BWR).

• The fuel cladding is the first of three fission product barriers.

• The secondary system is not radioactive.

• N-16 is a significant hazard from steam lines.

• The reactor coolant system is pressurized to prevent boiling in the reactor core.

• The Drywell houses the Reactor Coolant System and is the third and final fission product barrier.

• The fuel cladding is the first of three fission product barriers.

• N-16 is a significant hazard from steam lines.

• The Drywell houses the Reactor Coolant System and is the third and final fission product barrier.

Select the characteristics below that describe a Pressurized Water Reactor (PWR).

• The Reactor Coolant System is the second of three fission product barriers.

• The secondary system is not radioactive.

• N16 is a significant hazard from steam lines.

• The Reactor Building houses the Reactor Coolant System and is the third and final fission product barrier.

• The reactor coolant system is pressurized to prevent boiling in the reactor core.
  

• The Reactor Coolant System is the second of three fission product barriers.

• The secondary system is not radioactive.

• The Reactor Building houses the Reactor Coolant System and is the third and final fission product barrier.

• The reactor coolant system is pressurized to prevent boiling in the reactor core.

Which of the following isotopes are activated corrosion products?

• Mn-54

• H-3

• Fe-59

• Co-60

• N-16

• Co-58

• Kr-85

• I-131

• Mn-54

• Fe-59

• Co-60

• Co-58

Which of the following isotopes are the result of activation of water?

• H-3

• Li-6

• F-18

• Co-60

• I-131

• N-16

• Fe-59

• Kr-88

• F-18

• N-16

Which of the following isotopes are the result of activation of impurities in water?

• H-3

• Fe-59

• F-18

• Ar-41

• Na-24

• N-16

• Li-6

• Kr-88

• H-3

• Ar-41

• Na-24

Which of the following isotopes are fission products?

• Ar-41

• Xe-133

• Cs-137

• Na-24

• Li-6

• I-131

• Kr-88

• F-18

• Xe-133

• Cs-137

• Na-24

• Li-6

• I-131

• Kr-88

Which are the following isotopes are noble gases?

• Xe-133

• Na-24

• Li-6

• Kr-88

• Cs-137

• I-131

• F-18

• Ar-41

• Xe-133

• Kr-88

• Ar-41

Which of the following isotopes are transuranics?

• Am-241

• U-238

• Np-239

• Xe-133

• U-235

• Cs-137

• Pu-239

• I-131

• Am-241

• Np-239

• Pu-239

A centrifugal pump discharges the same flow rate regardless of the pressure it is pumping against.

• True

• False

False

A positive displacement pump is a pressure-creating device, i.e., as the pressure it is pumping against goes up, the flow rate goes down in direct correlation.

• True

• False

False

What type of valve raises and lowers a disk into a seat?

Gate Valve

When removing multiple layers of packing in a valve, the same contamination levels can be expected from all the layers.

• True

• False

False

A valve that does not have packing that is often used in radioactive waste systems is called a:

______

Diaphragm Valve

Where are leaks most likely to occur in a radioactive system?

• Pump seals

• Floor drains

• Radwaste systems

• Bolted connections

• Remote valve operators

• Valve packing

• Pump seals

• Bolted connections

• Valve packing

Select the items below that exist because of Compton Scatter.

• Skyshine

• Buildup Factor

• Elastic Scatter

• Pair Production

• Radon Contamination

• Loose Surface Contamination

• Skyshine

• Buildup Factor

What is the Half-Value Layer for lead when shielding a Co-60 source?

______

0.5 inches

What is the Tenth-Value Layer for water when shielding a Co-60 source?

______

24 inches

What is the metal compound that is often used where surfaces are most subject to wear (e.g., valve seats) that corrodes and causes elevated radiation levels from Co-60?

Stellite

Select the items below where you would expect crud to accumulate and create high radiation levels.

• Motor Operators for Valves

• Filters

• Air Operators for Valves

• Bottom of Tanks

• Drain Connections

• Conduit

• Valves

• Filters

• Bottom of Tanks

• Drain Connections

• Valves