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Number | ID | Test | Main phenomena under investigation | Justification | Note |
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(1) | UP-11-08 | 11% upper plenum break” | Break flow Two-phase natural circulation Phase separation without mixture level formation Entrainment in the core ECCS mixing and condensation Heat transfer in steam generator Flow stratification in horizontal pipes Heat transfer in the covered core Heat transfer in uncovered core (dryout) Rewet Thermal-hydraulics in pressurizer | Identification of similarities and differences in processes/phenomena behaviour at ISB-VVER and PSB-VVER (i.e., manifestation of “scaling effect”) and their quantitative characterization | Similar test of the ISB-VVER test |
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(2) | NC-1 | Natural circulation | Single-phase natural circulation Two-phase natural circulation Mixture level and entrainment in the core Heat transfer in steam generator Heat transfer in covered core Heat transfer in partly uncovered core Loop seal clearance | Basic phenomena in transients, need of data in “clean” boundary conditions (outcome of VVER validation matrix). Recommended by Gosatomnadzor | — |
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(3) | CL-4.1-03 | 4.1% cold leg break test | Break flow Two-phase natural circulation Asymmetrical loop behaviour Mixture level and entrainment in the core ECCS mixing and condensation Pool formation in the upper plenum Heat transfer in the covered core Heat transfer in uncovered core (dryout) Rewet and quenching Thermal-hydraulics in pressurizer Loop seal clearance | Relevant bounding case phenomenon. Data lacking, as from recommendation of OECD support group on the VVER validation matrix. Relevant for VVER safety assessment. Recommended by Gosatomnadzor | Counter-part of LOBI, BETHSY, SPES, and LSTF |
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(4) | PSh-1.4-04 | Primary to secondary leak | Break flow Two-phase natural circulation Mixture level and entrainment into SG Mixture level and entrainment into the core ECCS mixing and condensation Pool formation in the upper plenum Heat transfer in the covered core Heat transfer in uncovered core (dryout) Heat transfer in steam generator Thermal-hydraulics in pressurizer Loop seal clearance | Absence of test data for “primary to secondary leak” (VVER validation matrix). Recommended by Gosatomnadzor. Highly relevant for VVER safety assessment from point of view of radiological consequence | Analytical exercise among project participants (blind test) |
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(5) | CL-2x100-01 | Large cold leg break | Break flow Asymmetrical loop behaviour Mixture level and entrainment in the core ECCS mixing and condensation CCFL Pool formation in the upper plenum Heat transfer in the covered core Heat transfer in uncovered core (dryout) Quenching Thermal-hydraulics in pressurizer Loop seal clearance | Important for safety assessment evaluations, strongly supported by Gosatomnadzor | Benchmark among project participants |
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