ASME 58.22-2014

ASME 58.22, 2014 Edition – Requirements for Low Power and Shutdown Probabilistic Risk Assessment

ASME 58.22 sets forth the requirements for Low Power and Shutdown (LPSD) probabilistic risk assessments (PRA)and for LPSD Qualitative Risk Assessments (QLRA), both of which areused to support risk-informed decisions for commercial light water reactor nuclear power plants. ASME 58.22 also prescribes a method for applying those parts of the requirements as necessary to support specific applications.

The discussion of requirements for LPSD PRAs is presented in Parts 1 through 10, and the discussion of the method for applying them is presented in Section 1.3. These requirements would be used for applications requiring quantitative risk-informed insights during low power and shutdown conditions. The discussion of requirements and a method for applying them for LPSD QLRA are presented in Part 11. These requirements would be used for applications in which qualitative risk-informed insights suffice,such as for plant configuration control during shutdown conditions.