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| NKS Programme Area: | NKS-R | | Research Area: | Thermal hydraulics | | Report Number: | NKS-502 | | Report Title: | Passive safety system performance of SMRs | | Activity Acronym: | PAS-SMR | | Authors: | Xicheng Wang, Dmitry Grishchenko, Pavel Kudinov, | | Abstract: | This work aims to develop and validate modeling approaches for key Passive Safety System (PSS) phenomena, and to establish reliability assessment meth-odologies. A major focus is steam condensation in water pools, commonly used as SMR heat sinks, where temperature distribution strongly influences natural circulation and passive heat removal. Due to limited predictive capabilities, the development of mechanistic model and large-scale experiments have been initi-ated, including several international projects. This report details analytical sup-port for the OECD/NEA PANDA tests on steam injection into a water pool. Five tests were designed to address uncertainties in thermal stratification and mixing under pressurized, near-saturation conditions, using data-driven sensor place-ment for thermocouple positioning and combined Particle Image Velocimetry (PIV) to capture velocity and temperature profiles.
The report also reviews recent advances in PSS reliability analysis, emphasizing challenges in efficiently identifying Failure Domains (FDs). | | Keywords: | Steam Condensation, Pool Stratification, Passive Safety System, Reliability Analysis, Small Modular Reactors | | Publication date: | 25 Jun 2025 | | ISBN: | 978-87-7893-600-4 | | Number of downloads: | 95 | | Download: |  NKS-502.pdf |
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