Error analysis for PWR control rod integrate worth

During physical startup test, the control rod integrate worth is a parameter which is most likely to be overstepped. This paper analyzes the factors which contribute to the control rod worth error and its feature. Typical example is also included. To reduce the control rod error, it is strongly suggested to create an accurate reflector model, select fuel assembly manufacture data as input and consider the control rod worth measurement method and condition when performing the calculation. To identify the main reason of control rod worth error, flux mapping test results, boron concentration and other core parameters should be analyzed comprehensively, combining with the control rod worth error distribution characteristics. (authors)