Determination of weighting factors for safety performance indicators in NPPs

Safety Performance Indicators (SPIs) have found a wide use in safety management specially in Nuclear Power Plants (NPPs). The use of such a system in decision making vary from industry to industry depending on the objectives and scope. In this paper we will limit ourselves to NPPs. Furthermore the objective of the SPIs will be limited to safety management. One issue in using the SPIs is to determine the weightage of each SPI. The paper attempts to discuss this issue and provides guidelines to obtain weighting factors (WF) for the SPIs.