Validation of NuStar's PWR core analysis system

A new PWR core analysis system has recently been developed in NuStar. It adopts not only conventional theoretical framework that widely used in today's production code, but also latest progress that achieved internationally and within the company. To validate the system, a total of 44 operation cycles of Qinshan Phase 1 and 2 reactors are evaluated and results are compared against the measurement data. Statistics analyses of prediction errors for both low-power startup physics test states and high-power normal operation conditions demonstrate that the development of the system is quite a success. It not only has a generic applicability for reactors with different design, but also has a very good accuracy for parameters that are measurable at the site. Among all the validated cases, only for very rare cases that the acceptance tolerance is violated, and the error distributions for all the validated parameters present to be good ones that are close to the normal distribution. Based on the validation results, the system is considered to be qualified for practical applications. (author)