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What is the Maintenance Rule?
- A(1) - Monitor against goals
- A(2) – Monitor against PC
- A(3) – Periodicity - Every refueling cycle not to exceed 24 months
- A(4) Online Risk Assessment
- B(1) – Scope of what falls under M-Rule (SR)
- B(2) - Scope of what falls under M-Rule (Non-SR)
Why was it developed?
- During the 1980’s the NRC started to consider the need for a rule to address the maintenance of nuclear power plants
- NRC had indications that a lack of effective maintenance could adversely affect overall plant safety.
Overall of the M-Rule
To improve reliability and availability of equipment
Purpose of the Maintenance Rule:
To ensure the effectiveness of the maintenance program
Objective of the Maintenance Rule:
Establish and Monitor goals of performance criteria (reliability and availability)
How does the M-Rule meet goals?
- Data monitoring/trending to take corrective actions
- Shift focus to balance LRS/HRS
How was the M-Rule developed?
- 1. Scoping
- 2. Risk Ranking
- 3. Develop PC
- 4. (a)(2) Monitoring
- 5. (a)(1) Monitoring
- 6. (a)(3) Assessment
- SR components:
- Important in an accident
- Relied upon to mitigate an accident
- Used in EOP
- Could cause a reactor scram
2. Risk Ranking
- 1. Quantitative – criteria set based on calculations
- 2. Qualitative – Considerations not based on calculations
- 3. Expert Panel governed by different procedure, includes:
- a. Engineering
- b. *PRA
- c. *Maintenance
- d. *Operations
- e. Work Management
- NOTE: * Required to attend if scoping or determining ranking
3. Develop PC
- 1. PC – Always a(2)
- 2. Goals – Always a(1)
- 3. Use PRA if it is modeled
- 4. HRS – Monitor Reliability and Availability
- 5. Plant Level:
- a. Reactor Trip
- b. Unexplained reduction in power >20%
- c. Unplanned Safety Function Actuation
4. (a)(2) Monitoring
- 1. Reliability – PVAR Reviews
- 2. Availability – M-Rule Coordinator
5. (a)(1) Monitoring
- 1. PC or a(1) goal is inappropriate
- 2. Monitoring data is incorrect
- 3. Not Maintenance Related
- 4. Condition is corrected, CAs are complete and effective
- 5. For exceeding a(1) goal, existing corrective actions correct the cause
- 6. Degraded structure still meets its design basis
6. (a)(3) Monitoring (Assessment)
- 1. Periodic (every refueling cycle (18 months) not to exceed 24 months)
- 2. Asses balance between reliability and availability
What is a Maintenance Rule Functional Failure?
- A component failure that causes a required function to be lost.
- Identified by system engineers, tracked by M-Rule Coordinator
- Equipment that is unavailable is made available again when it is in the logs.
What is the impact of moving from a(2) to a(1)?
- A(2): (good)
- Reliability – PVAR Reviews
- Availability – M-Rule Coordinator
- A(1): (bad)
- Exceeding performance criteria (a(2))
- Exceeding goal – must go to expert panel (a(1))
- Exceeding plant level performance criteria
- Maintenance Rule Repetitive Functional Failure (MRRFF)
- Significant Declining Trend
M-Rule Document Hierarchy
- 10 CFR 50.65
- Reg. Guide 1.160 Rev. 2 - Committed to in 1.8
- NUMARC 93-01 Rev. 3
- 70DP-0MR01, Rev. 34
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