Abstract: The background and meaning of the limits formulation were revealed based on the study of the specific activity limits of primary coolant in Westinghouse standard specifications. This is helpful for the in-depth understanding and follow-up implementation of the relevant operation provisions. Through the comparison between AP1000 power plant specifications and Westinghouse standard specifications, it is found that the total specific radioactivity limit in AP1000 power plant specifications is replaced by the dose equivalent of ¹³³Xe specific activity limit in AP1000 power plant specifications. The dose equivalent of ¹³¹I and ¹³³Xe specific activity limit are calculated based on the design basis of 0.25% fuel cladding defect. The source terms used in shielding design, waste treatment system design and accident radioactive consequence analysis are consistent. Finally, combined with the requirements of domestic regulations and standards, some suggestions were given on adjusting the iodine spike specific activity limits and dose equivalent of ¹³¹I and ¹³³Xe specific activity limit according to the source terms of 0.25% fuel cladding defect.

Key words: technical specifications, iodine, specific activity, limit condition for operation, AP1000