Abstract
Hydraulic suspended passive shutdown subassembly (HS-PSS) belongs to one of the diverse passive safety devices for further enhance safety for pool-type sodium-cooled fast reactor (SFR). The hydraulic moving body (HMB) in the PSS with neutron absorbers inside was designed to insert into the core automatically within a stipulated time when the mainstream below a critical flow rate. The dynamic displacement performance of the HMB is of particular importance to ensure the safety of SFR especially during the Unprotected loss of flow accident (ULOF). In this paper, the mathematical modeling related to the falling process, the hydraulic characteristics of HMB under different flows are detailed. A series result of the sensitivity analysis of the factors affecting HMB performance, such as the flow rate and the size of some key structures, are obtained through calculation. A PSS-mockup was tested at the hydraulic (water) test bench and the calculation program was validated by the experimental results.
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