Podcast
Questions and Answers
What must be established to use nominal CC factor probability in the RICT calculation?
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?
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?
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?
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?
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?
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?
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?
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)?
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?
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?
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?
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?
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?
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?
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?
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.
