Background: The over temperature/over power ΔT (OT/OP ΔT) is a key protection to Pressurized Water Reactor (PWR) and the response time testing of the protection is required in technical specifications of Preliminary Safety Analysis Report (PSAR). Purpose: To have credible response time testing of the protection

including the effects of dynamic compensation unit

analysis was conducted on the requirements of the rules and the application of the design. Methods: Firstly

the application of the protection algorithm is analyzed. Then the requirements of IEEE388 and the dynamic response of the typical dynamic compensation units upon step and impulse stimulations are studied. Results: Base on the analysis

corresponding to the nominal thermohydraulics and the instrumentation and control design

a recommend testing parameter configuration set for AP1000 OT/OP ΔT protection response time testing is developed. The non-negligible effect of dynamic compensation units is concluded as well. Conclusion: As a result

the requirement of having the dynamic compensations on line for the response time testing is strongly proposed. Abstract