Method and experimental study for measuring micro-leakage characteristics of steam from lifting hatch at high temperature and pressure
[Objectives]This study focuses on the sealing performance of lifting hatches applied to nuclear power plants under accidental working conditions.[Methods]An experimental setup is built to achieve the quantitative measurement of steam micro-leakage.In this device,saturated steam at 0.66 MPa is charged into a pressurized chamber to simulate accident conditions,the leaking steam is collected through a collection cham-ber with an insulation layer,and no condensation occurs.The changes in temperature,humidity and pressure in the collection chamber are monitored in real time to estimate the steam leakage rate.[Results]The experi-mental results show that the steam leakage rates of the lifting hatch models with 1.5 mm and 3.0 mm compos-ite gaskets are 13.93 g/24h and 11.91 g/24h respectively,both meeting the low leakage design requirements,with the 3.0 mm gasket providing superior sealing performance.An analysis of the dry air and steam measure-ments with the same gasket and at the same pressure shows that the sealing coefficients nd4 obtained for both are very close,which verifies the accuracy of the experimental device for steam microleakage measurements.[Conclusions]The proposed steam microleakage measurement method can be extended to various sealing structures and pressure systems,and provides a new measurement idea for evaluating the sealability of stack chambers under accident conditions.
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