Probabilistic safety analysis (PSA) technology has become the mainstream analysis method in the world to support the daily risk management and safety decision-making of nuclear power plants. For surveillance test interval optimization, many applications have been carried out in domestic nuclear power plants, but due to the particularity of reactor protection system (RPR) related tests, the research is limited. In this paper, taking the surveillance test interval optimization of reactor protection system in a domestic power plant as an example, the method flow of risk-informed surveillance test interval optimization is used for application exploration. The final conclusion is: after the PTXRPA/B030 test interval is extended, it will not affect the compliance with the defense in depth principle of the power plant, nor the maintenance of the safety margin; The equipment verified by PTXRPA/B030 test procedure has good historical performance, so the performance will not be significantly affected by the extension of test period; After the PTXRPA/B030 test interval is extended, the risk increment of the power plant is small and the risk change is completely acceptable; The PTXRPA/B030 test interval can be extended from the current two-month execution to four month execution.