Questions and Answers
What must be established to use nominal CC factor probability in the RICT calculation?
What is a consequence of failing to account for the increased possibility of CC failure?
Which method is NOT mentioned for addressing increased CC failure possibility in RICT calculations?
What is required when a component fails in relation to CC failure probability?
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What type of condition prompts an exit from a RICT entry?
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In the context of the RICT calculation, what does RMA stand for?
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According to the content, the RICT calculation requires documentation of RMAs for what purpose?
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What is implied if a PRA functionality determination shows that LCO cannot be restored?
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What is the maximum duration allowed for a Risk Informed Completion Time (RICT)?
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In which operational modes can a RICT be utilized?
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When a RICT is being used, what must be considered for any plant configuration change?
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What must happen for a planned change in configuration while a RICT is in use?
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Under which condition is the use of a RICT not permitted?
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When can a RICT be utilized for emergent conditions regarding specified safety function loss?
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What must be true about structures, systems, and components (SSC) for them to be involved in the PRA Functionality determination?
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What is the maximum allowed duration for a RICT under emergent conditions representing a loss of a specified safety function?
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Study Notes
Risk Informed Completion Time Program
- The Risk Informed Completion Time (RICT) Program establishes controls for calculating RICT in accordance with NEI-06-09 guidelines.
- The maximum duration for a RICT is set at 30 days.
- RICT can only be utilized when the plant is in MODE 1 and 2.
- Any configuration changes impacting RICT must be assessed under the Configuration Risk Management Program.
- Revised RICT must be established for planned changes prior to implementation.
- For emergent conditions, revised RICT must be determined within:
- Required Action Completion Time, or
- 12 hours after the configuration change, whichever is shorter.
- Changes reducing plant risk do not necessitate a revised RICT.
- RICT is not allowed for voluntary configuration changes that inhibit specified safety functions or render all required system trains inoperable.
- RICT is permissible for emergent situations causing loss of safety function if trains are deemed “PRA Functional” as defined in NEI 06-09, with a maximum duration of 24 hours.
- Additional constraints for “PRA Functional” criteria:
- Structures, systems, and components (SSC) considered PRA Functional must match those relied upon in Technical Specifications.
- Design basis success criteria must be satisfied for accidents when applying RICT during loss of function.
- Assessment of common cause (CC) failure potential is mandatory upon entering a RICT due to emergent conditions.
- If high confidence exists that CC mechanisms do not affect redundant components, nominal CC factor probability can be used for RICT calculation.
- If confidence is low, RICT must adjust for the increased likelihood of CC failure.
- Two methods for addressing increased CC failure probability:
- Adjust RICT calculation to account for CC failure probability as per RG 1.177 guidance.
- Implement Risk Mitigation Actions (RMA) not credited in the current RICT calculation, targeting the success of redundant SSCs.
- Documentation of all RMAs must be available for review by the NRC.
- A RICT entry must be rejected or exited if a PRA Functionality determination indicates that restoring LCO cannot be achieved without compromising functional success criteria.
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Description
This quiz covers the essential aspects of the Risk Informed Completion Time Program, focusing on the controls and guidelines as per NEI-06-09. It includes critical rules about the application of RICT, specifically its duration and conditions for use in different operational modes. Test your understanding of these risk management strategies.
