Radiological Aspects of Nuclear Plants Cognitive Enabling Objectives

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

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

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

• 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 pressurized to prevent boiling in the reactor core.

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

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

• The secondary system in not radioactive.

Which of the following isotopes are activated corrosion products?

• Co-58

• Fe-59

• Co-60

• Mn-54

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

• N-16

• F-18

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

• Na-24

• Ar-41

• H-3

Which of the following isotopes are fission products?

• I-131

• Xe-133

• Kr-88

• Cs-137

Which of the following isotopes are noble gases?

• Kr-88

• Ar-41

• Xe-133

Which of the following isotopes are transuranics?

• Am-241

• Pu-239

• NP-239

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

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.

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.

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

• Bolted Connections

• Valve Packing

Select the items below that exist because of Compton Scatter.

• Buildup Factor

• Skyshine

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.

• Bottom of tanks

• Filters

• Drain connections

• Valves