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Nuclear Reactor Safety > Reactor Oversight Program
 
Reactor Oversight Program
 
The Thresholds of Performance Indicator
 

Cornerstone

Performance Indicator

Thresholds

Green

White

Yellow

Red

Initiating Events

The number of unplanned scrams during the previous 4 quarters, both manual and automatic, while critical per 7,000 hours

≤ 3.0 > 3.0 > 6.0 > 25

Total unplanned scrams while critical in the previous 4 quarters with loss of normal heat removal

≤ 2.0 > 2.0 > 10 > 20

The number of unplanned changes in reactor power of greater than 20% full-power,
per 7,000 hours of critical operation excluding manual and automatic scrams

≤ 6.0 > 6.0 NA NA

Mitigating Systems

The unavailability of safety system in the previous 12 quarters

All Plants

≦2EDG

≤ 2.5% ≤ 2.5% > 5.0% > 10.0%

>2EDG

≤ 2.5% ≤ 2.5% > 10.0% > 20.0%

BWR

HPCI

≤ 4.0% ≤ 4.0% > 12.0% > 50.0%

HPCS

≤ 1.5% ≤ 1.5% > 4.0% > 20.0%

RCIC

≤ 4.0% ≤ 4.0% > 12.0% > 50.0%

RHR

≤ 1.5% ≤ 1.5% > 5.0% > 10.0%

PWR

HPSI

≤ 1.5% ≤ 1.5% > 5.0% > 10.0%

AFW

≤ 2.0% ≤ 2.0% > 6.0% > 12.0%

RHR

≤ 1.5% ≤ 1.5% > 5.0% > 10.0%

The number of safety system functional failures in the previous 4 quarters

BWR

≤ 6.0 > 6.0 NA NA

PWR

≤ 5.0 > 5.0 NA NA

Barrier Integrity

The percentage of Reactor Coolant System specific activity to the Technical Specification limit in the previous 4 quarters

≤ 50.0% > 50.0% > 100.0% NA

Public Radiation Safety :The percentage of Reactor Coolant System leakage rate to the Technical Specification limit in the previous 4 quarters

≤ 50.0% > 50.0% > 100.0%

NA

Emergency Preparedness

Drill/Exercise Performance

≥ 90% ≥ 70% < 70%

NA

Emergency Response Organization Drill Participation

≥ 80% ≥ 60% < 60%

NA

Alert and Notification System Reliability

≥ 94% ≥ 90% < 90%

NA

Occupational
Radiation Safety

Occupational Radiation Exposure Control Effectiveness in the previous 4 quarters

≤ 2 > 2 > 5

NA

Public Radiation
Safety

The performance of the Radiological Effluent Control Program in the previous 4 quarters

≤ 1 > 1 > 3

NA

Liquid Radioactive Waste Management

Average Liquid radioactive waste generated (gallon per day) in the previous 3 months

≤ 0.9
FSAR

≤ 1.0
FSAR

> 1.0
FSAR

NA

Recycling ratio of liquid radioactive waste in the previous 3 months

≥ 92% ≥ 90% < 90%

NA

The number of Correction Request and Violation relative to liquid radioactive waste in the previous 3 months

The number of Correction Request <2 and no violation

The number of Correction Request ≤4 or  level Ⅴ violation equal to 1

The number of Correction Request >4 or level Ⅴ violation equal to 2 or level Ⅳ violation equal to 1

The number of level Ⅴ violation ≥ 3 or level Ⅳ violation  ≥ 2 or level Ⅲ violation  ≥1

 

Green:indicates performance within an expected performance level where the associated cornerstone objectives are met.
White:represents performance outside an expected range of nominal utility performance but related cornerstone objectives are still being met.
Yellow:indicates related cornerstone objectives are being met, but with a minimal reduction in the safety margin.
Red:signals a significant reduction in safety margin in the area measured by the performance indicator.

 
 
 
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