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피동형 원자로의 Hydraulic Valve에 관한 연구
김융석,김상녕 경희대학교 산학협력기술연구원 1996 산학협력기술연구논문집 Vol.2 No.-
In a passive reactor, when the main coolant pump fails or the main coolant flow is not adequate, the reactor should be shutdowned and its decay power should be removed by passive methods. This passive function is controlled by the density locks which separates the main coolant from the high-borated cold pool water. In transients, however, the borated pool water can unnecessarily enter into reactor core through the unstable lower density lock. This drawback of density lock necessitates a hydraulic valve which, in normal operation condition, prevents the borated pool water from entering into the main coolant loop except a small amount of leaking flow. In a transient(main coolant pump head is not enough) its opening makes the pool water circulate the decay heat removal loop. The hydraulic valve which is in the stage of development is operated by the fluid mechanical force balance. So, the major parameters and the pressure drops of the valve could be analyzed with the mass and force balance equations for a control volume of the valve. The governing dimensionless numbers of the valve were also determined by theorical analysis. On the basis of above results, an one-third scale experimental rig including the hydraulic valve was designed. The experimental rig results have shown the successful performance and the characteristics of the valve.