Measuring methods for helium leakage rate of the primary coolant loop of HTR-10

This article introduces two kinds of methods for helium leakage rate measurement of the primary coolant loop of HTR-10, which are direct measuring method and stock balance method. it analyzes the practicability of direct measuring method towards the variety property of parameters of HTR-10 primary loop, and presents method of the empirical formula used in calculating the average temperature of the helium in the pressure vessel. It also compares the two results obtained from these two methods with the actual parameters, and the maximal relative error is 5.7%. It proves that the results from direct measuring method are credible, and the results can be used to monitor whether the helium leakage rate per day is less than 1% of total helium in the primary coolant loop. (authors)