Nuclear Safety 4

Which of these is NOT one of the physical barriers for Defence in Depth?

• Fuel matrix

• Boundary of coolant system

• Containment building

• Steam generator

Which of these are Prevention methods in Defence in Depth?

• Redundancy

• Conservativism

• SQEP

• Physical separation

What is level 2 in Defence in Depth?

• Prevention

• Abnormal Operation

• Accident Management

• Severe Accident Management

Match the following situations to the correct Defence in Depth level.

• Level 5

• Emergency Response Planning

• Level 4

• Design Extension Conditions

• Level 3

• Anticipated Operational Occurrences

• Level 2

• Design Bases Accidents

Which of these is NOT part of the acceptance criteria for a Level 2 situation?

• Pressure remains below 110% of design pressure

• Fuel cladding integrity is maintained

• Containment is breached

• Cooling is maintained

What problems are associated with a Loss of Coolant Accident?

• Fuel cladding can degrade

• Steam can react with cladding to produce hydrogen

• Boron precipitation can cause coolant channel blockages

• Build up of pressure can cause radiological leaks

What level of Defence in Depth would a Loss of Coolant accident, followed by failure of the Emergency Core Cooling System be?

• Level 2

• Level 3

• Level 4

• Level 5

What level of Defence in Depth would containment failure be?

• Level 5

• Level 4

• Level 3

• Level 2

Which of the following methods could be used as part of Emergency Response Planning?

• Sheltering

• Iodine tablets

• Evacuation

• Monitoring Cs-137 release

What is the role of the Reactor Protection System?

• To monitor the plant for abnormal conditions

• To alert operators to abnormal conditions

• To automatically initiate SCRAM

• To prevent damage to the core