NANTeL Industrial and Fire Safety 5

Question 1

Under 10 CFR 50 Appendix R, nuclear plants must demonstrate that a reactor can be safely shut down and maintained in a cold shutdown condition using:

Accepted Answer

One success path free from fire damage for each safe shutdown function

Answer

Appendix R requires at least one success path for safe shutdown functions to remain free of fire damage in any fire scenario.

Question 2

What is the primary chemical reaction principle behind a dry chemical fire extinguisher's effectiveness?

Accepted Answer

Interrupting the chemical chain reaction of combustion

Answer

Dry chemical agents primarily work by chemically interrupting the free radical chain reaction that sustains combustion.

Question 3

In industrial hygiene, the term 'Threshold Limit Value - Ceiling (TLV-C)' means a concentration that should:

Accepted Answer

Not be exceeded at any time during the workday

Answer

TLV-C is an instantaneous ceiling value that must never be exceeded at any moment during the workday.

Question 4

Which of the following best describes the purpose of an Operability Determination (OD) when an industrial safety deficiency is found at a nuclear plant?

Accepted Answer

To formally assess whether a structure, system, or component can still perform its safety function despite the deficiency

Answer

An Operability Determination evaluates whether a degraded or nonconforming SSC can still fulfill its required safety function.

Question 5

A fire alarm initiating device that detects the rate of temperature rise rather than a fixed temperature threshold is called a:

Accepted Answer

Rate-of-rise heat detector

Answer

A rate-of-rise heat detector activates when temperature increases faster than a preset rate, catching fast-developing fires even at lower absolute temperatures.

(NANTeL) National Academy for Nuclear Training e-Learning Practice Test

(NANTeL) National Academy for Nuclear Training e-Learning Practice Test

NANTeL Industrial and Fire Safety 5