All aspect quantification system for the risk rating of operating errors for an advanced boiling water reactor

An operating error risk rating assessment method for advanced boiling water reactor comprises the following:

• 1) Determine whether the discovered operating error is the specific power plant configuration with risk potential for advanced boiling water reactor;
• if yes, proceed with subsequent risk assessment;
• if not, it is determined as risk free;
• 2) Classify the advanced boiling water reactor into power operation, low power operation and shutdown for major repairs;
• 3) In selection of power operation configuration, the safety assessment models include plant event, flood, fire and earthquake;
• prior to assessment it needs to determine whether the discovered operating error is related to fire-prevention, flood-prevention or earthquake-prevention facilities;
• if yes, proceed with the calculation in Step 4);
• if not, proceed directly to the calculation in Step 5);
• 4) When the user determines the discovered operating error is related to fire-prevention, flood-prevention or earthquake-prevention facilities, assess the power plant configuration for the discovered operating error and re-calculate the frequency for each configuration as the input data for power operation safety assessment;
• 5) Based on power plant configuration change and the safety assessment model for power operation configuration, calculate CDFi,j and LERFi,j in Equation [1] and Equation [2];
• 6) In selection of low power operation plant configuration, based on the safety assessment model for low power operation plant configuration, calculate CDFi,j and LERFi, in Equation [1] and Equation [2];
• 7) In selection of shutdown for major repairs plant configuration, based on the safety assessment model for shutdown for major repairs plant configuration, calculate CDFi,j and LERFi,j in Equation [1] and Equation [2];
• 8) After completion of safety assessment, based on safety rating calculate the risk increase, CDF and LERF, in Equation [1] and Equation [2], and then use the calculation results for CDF and LERF to assess the risk rating for the discovered operating error;
• select the larger risk rating as the final representative risk rating for the operating error.