Nuclear Safety 6

What is safety culture?

• Safety culture is the collective mindset and practices of an organization that prioritize safety and risk management.
• Safety culture is a set of regulations imposed by government agencies.
• Safety culture is the individual mindset of employees regarding their personal safety.
• Safety culture refers to the physical safety equipment used in the workplace.

Which of these factors have an influence on safety culture?

• Good management

• Training and competence

• Employee involvement

• Good communication

True or false: A good safety culture is assumed for safety case production.

• True

• False

What could happen if safety culture is overstated?

• Hazards could be underestimated

• Risks would decrease

• Fewer people would be injured

• More people could be injured

How could operator understanding of the safety case be ensured?

• Toolbox talks

• Specific training programme

• Exams/assessments

• Safety walks

Which formula is correct?

• Risk = frequency x consequences

• Risk = event x magnitude

• Risk = consequence / time

• Risk = event / frequency

What are the benefits Probabilistic Safety Analysis?​​ (a)   ​ ~​ (b)   It is quantitative​ ​ (c)  

• Limitations
• It is systematic
• It is based on assumptions
• Data may not be accurate
• It requires a complex understanding
• It considers complex interactions

What are the numerical limits set in the SAPs for decisions around keeping risks ALARP?

• Basic Safety Levels and Basic Safety Objectives

• Basic Safety Layers and Basic Safety Outcomes

• Bottom Safety Level and Top Safety Level

• Lower Safety Limits and Upper Safety Limits

Match the description to the type of analysis:

Groups:

(a) Event tree

,

(b) Fault tree

• Deductive

• Used to calculate failure probabilites

• Top level analysis

• Starts from the initiating event

• Detailed analysis

• Starts from the unwanted outcome

• Uses Boolean logic

• Inductive

What are minimal cut sets?

• Minimal cut sets are the smallest sets of component failures that can cause system failure.
• Minimal cut sets are the combinations of components that always function incorrectly.

• Minimal cut sets refer to the total number of components in a system.
• Minimal cut sets are the largest sets of component failures that can cause system success.