Cornerstone Inspection Objective Risk Priority Example Mitigating Systems Identify any Focus in areas with Integrated mitigating system, potential for common safeguards testing credited by the mode failures. licensee as operable Emergency diesel when assessing risk, Select surveillance start/load testing which is adversely tests which cross impacted by technical disciplines Battery performance surveillance testing (electrical, testing related failures such mechanical, I&C) as failure to Reactor protection, adequately test, IST of pumps and RCS leakage failure to meet test valves that perform detection, and safety criteria or, failure to important functions in injection realign equipment mitigating systems.1 instrumentation after the surveillance. testing Safety bus loss of voltage and degraded voltage testing that provide injection water flow and valves that change position to provide injection water flow to the reactor coolant system. Barrier Integrity Identify any Containment containment integrity isolation valve supporting system, testing, credited by the ventilation/filtration licensee as operable system testing when assessing risk, which is adversely impacted by surveillance test failures such as failure to adequately test, failure to meet test criteria or failure to realign equipment after the test. 1. For additional guidance on IST inspection refer to IP 73756, Testing of Pumps “In-service and Valves” and NUREG-1482, for Inservice Testing at Nuclear Power Plants.” “Guidelines
Cornerstone Inspection Objective Risk Priority Example Mitigating Systems Identify any mitigating system, credited by the licensee as operable when assessing risk, which is adversely impacted by surveillance testing related failures such as failure to adequately test, failure to meet test criteria or, failure to realign equipment after the surveillance. Focus in areas with potential for common mode failures. Select surveillance tests which cross technical disciplines (electrical, mechanical, I&C) IST of pumps and valves that perform important functions in mitigating systems.1 Integrated safeguards testing Emergency diesel start/load testing Battery performance testing Reactor protection, RCS leakage detection, and safety injection instrumentation testing Safety bus loss of voltage and degraded voltage testing that provide injection water flow and valves that change position to provide injection water flow to the reactor coolant system. Barrier Integrity Identify any containment integrity supporting system, credited by the licensee as operable when assessing risk, which is adversely impacted by surveillance test failures such as failure to adequately test, failure to meet test criteria or failure to realign equipment after the test. Containment isolation valve testing, ventilation/filtration system testing 1. For additional guidance on IST inspection refer to IP 73756, “In-service Testing of Pumps and Valves” and NUREG-1482, “Guidelines for Inservice Testing at Nuclear Power Plants.”