System T5

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Harley.Rachael
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224461
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System T5
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2013-06-20 12:29:49
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System T5
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System T5
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  1. 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)
  2. 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.
  3. Overall of the M-Rule
    To improve reliability and availability of equipment
  4. Purpose of the Maintenance Rule:
    To ensure the effectiveness of the maintenance program
  5. Objective of the Maintenance Rule:
    Establish and Monitor goals of performance criteria (reliability and availability)
  6. How does the M-Rule meet goals?
    • Data monitoring/trending to take corrective actions
    • Shift focus to balance LRS/HRS
  7. 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
  8. 1. Scoping
    • Form
    • SR/Non-SR
    • SR components:
    •     Important in an accident
    •     Relied upon to mitigate an accident
    •     Used in EOP
    •     Could cause a reactor scram
  9. 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
  10. 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
  11. 4. (a)(2) Monitoring
    • 1.      Reliability – PVAR Reviews
    • 2.      Availability – M-Rule Coordinator
  12. 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
  13. 6. (a)(3) Monitoring (Assessment)
    • 1.      Periodic (every refueling cycle (18 months) not to exceed 24 months)
    • 2.      Asses balance between reliability and availability
  14. 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.
  15. 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
  16. M-Rule Action Timeline
  17. 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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