Another Event Classification System from Bruce Power
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Criteria for Selecting SCR Resolution Category
Category A Team Root Cause Analysis
* A Type I event (per event triangle) has occurred; or
* An event, incident or error-likely situation that under slightly different conditions could have lead to a Type I event.
Category B Root Cause Analysis
* A Type II event or occasionally a Type III event (per event triangle) has occurred; or
* An event, incident or error-likely situation that under slightly different conditions could have lead to a Type II event.
Events, incidents and error-likely situations that are not Type I or II (actual or near miss) are generally classified as “C-ACE”, “C-Fix”, or “D”. The following criteria can be used to determine which.
Category C Apparent Cause Evaluation
A “C-ACE” categorization should be “tested” using the following additional criteria (if it does not meet these criteria it should be considered for a “C-Fix”):
* It is necessary to do an evaluation to understand what the cause of the event, incident or error-likely situation was so we can prevent it from recurring; or
* It is necessary to do an evaluation to see how broad the problem is (units affected, organizations affected, etc.) to ensure the correct actions assigned are broad enough in scope.
Category C Fix-Only
A “C-Fix” categorization should be “tested” using the following additional criteria (if it does not meet at least one of these criteria it should be assigned “D”):
* Actions are deemed necessary to prevent a future event as opposed to taking action in future based on a trend of events
* Action is necessary to bring Bruce Power into compliance with a legal or regulatory requirement, e.g., Pressure Boundary Program, Dosimetry Program, etc.
* Action is necessary to satisfy the requirements of the Bruce Power Management System, including requirements from WANO PO&Cs, ISRS, EMS, etc.
Category D Trend Only
A “D” categorization should be “tested”, i.e. it should meet at least one of:
* It is believed to have a low probability of recurrence (taking immediate follow-up action into account); or
* Action is not warranted at this time to prevent a future event because trending of SCRs will indicate if action is warranted in the future.
MRM will use discretion to deviate from these guidelines, in the case of extenuating circumstances, as stated in Appendix A, BP-PROC-00065 (event triangle). The extenuating circumstances should be noted in the SCR.
From Terry Bartley
Functional Area Coordinator – Plant Support
Corrective Action Control Group
Corporate Risk Oversight and Audit Dept.