According to the IAEA (International Atomic Energy Agency) *1, the “Living PSA” and “Risk Monitor” is defined as follows;
A “living PSA” (LPSA) can be defined as a PSA of the plant, which is updated as necessary to reflect the current design and operational features, and is documented in such a way that each aspect of the model can be directly related to existing plant information, plant documentation or the analysts’ assumptions in the absence of such information. The LPSA would be used by designers, utility and regulatory personnel for a variety of purposes according to their needs, such as design verification, assessment of potential changes to the plant design or operation, design of training programmes and assessment of changes to the plant licensing basis.
Some PSA applications require the on-line use of the PSA models, and near-prompt knowledge of the risk caused by the actual situation at the plant. This requirement can be satisfied by using a special tool called a safety monitor.
A safety monitor (also referred to as risk monitor) is a plant specific real-time analysis tool used to determine the instantaneous risk based on the actual status of the systems and components. At any given time, the safety monitor reflects the current plant configuration in terms of the known status of the various systems and/or components, e.g. whether there are any components out of service for maintenance or tests. The safety monitor model is based on, and is consistent with, the LPSA. It is updated1 with the same frequency as the LPSA. The safety monitor is used by the plant staff in support of operational decisions.
We have a plan that our DiD Risk Monitor can analyze real-time risk.
*1 IAEA-TECDOC-1106 (1999)：Living Probabilistic Safety Assessment (LPSA)