Defense-in-depth Accident Prevention relies on which of the following described in the FSAR?

Defense-in-depth Accident Prevention relies on which of the following described in the FSAR?

• A. Emergency procedures described in the plant manual
• B. Operator training requirements described in the SOP
• C. Limits of normal operating procedures described in the FSAR
• D. Design basis criteria described in the accident handbook

Answer: (C)

The idea being tested is that staying within defined operating boundaries, as shown in the FSAR, is the primary way to prevent accidents by defense-in-depth. These Limits of Normal Operating Procedures set the safe envelope for key plant parameters and specify actions if conditions approach those limits, so staff can keep the plant in a state where safety systems and barriers can function as intended. By operating within these limits, the multiple layers of protection remain effective and the likelihood of progressing toward an accident is minimized. Emergency procedures describe actions after something goes wrong, and training or general design bases support safety in different ways, but the mechanism most directly described in the FSAR for accident prevention through defense-in-depth is the limits that define normal operation.

The idea being tested is that staying within defined operating boundaries, as shown in the FSAR, is the primary way to prevent accidents by defense-in-depth. These Limits of Normal Operating Procedures set the safe envelope for key plant parameters and specify actions if conditions approach those limits, so staff can keep the plant in a state where safety systems and barriers can function as intended. By operating within these limits, the multiple layers of protection remain effective and the likelihood of progressing toward an accident is minimized. Emergency procedures describe actions after something goes wrong, and training or general design bases support safety in different ways, but the mechanism most directly described in the FSAR for accident prevention through defense-in-depth is the limits that define normal operation.