气体泄漏幂函数模型在双层安全壳环廊密封性试验中的应用

双层安全壳核电机组的环廊密封性是核安全的重要保证，需在机组装料前完成测试。气体泄漏幂函数模型在计算民用建筑泄漏时比二次函数模型有更大的压力适用范围和更高的精度。本文以气体泄漏幂函数模型为基础，推导了环廊泄漏率的计算模型，以及带环廊负压修正的幂函数拟合方案，并采用某双层安全壳环廊密封性试验实测数据对该计算模型进行验证。结果表明，本文计算模型比带环廊负压修正的二次函数拟合方案和国外某公司使用的线性拟合方案有更高的精度，与双层安全壳实际泄漏情况更加吻合。

Application of Power Function Model of Gas Leakage in Tightness Test of Double-wall Containment Annulus

The tightness of the annulus of the nuclear power unit with double-wall containment is an important guarantee of nuclear safety, which needs to be tested before the unit is loaded. The power function model of gas leakage has a wider range of pressure application and higher accuracy than the quadratic function model for calculating the leakage of civil buildings. In this paper, based on the power function model of gas leakage, the calculation model of annulus leakage rate and the power function fitting scheme with annulus negative pressure correction are derived, and the calculation model is verified by the measured data of a double-wall containment annulus tightness test. The results show that the calculation model in this paper has higher accuracy than the quadratic function fitting scheme with annulus negative pressure correction and the linear fitting scheme used by a foreign company, and is more consistent with the actual leakage of double-wall containment.