International Standard Problems and Small Break Loss-of-Coolant Accident (SBLOCA)

Table 5

Suitability of tests facilities, judgment of the experiments, and (example of) evaluation of RELAP5/Mod2 and CATHARE code capabilities as from [13].

	Facilities				Experiments
Phenomena	SPES	LOBI/Mod2	BETHSY	LSTF	ISP 18	ISP 20	ISP 22	ISP 26	ISP 27	RELAP5/Mod2 Code	CATHARE V 1.3
										Performance^(°)	Code Performance
Natural circulation in one-phase flow, primary side	+	+	+	+	o	−	−	−	−	+	+
Natural circulation in two-phase flow, primary side	+	+	+	+	+	−	o	−	o	+	+
Reflux condenser mode and CCFL	o	o	+	+	o	−	+	+	+	o	o
Asymmetric loop behaviour	+	o	+	o	−	o	+	o	+	o	o
Leak flow	o	+	+	+	−	−	o	+	+	o	+
Phase separation without mixture level formation	+	+	+	+	−	−	−	−	o	×	+
Mixture level and entrainment in steam generator secondary side	o	o	o	+	o	o	+	o	o	o	o
Mixture level and entrainment in the core	o	o	+	−	−	−	+	+	+	o	o
Stratification in horizontal pipes	o	o	+	+	o	−	−	+	+	o	+
Emergency core cooling mixing and condensation	o	o	o	+	o	−	−	+	+	−	o
Loop seal clearance	+	+	+	+	−	−	−	+	+	+	+
Pool formation in upper plenum/CCFL	o	−	o	o	−	−	−	o	o	−	o
Core wide void and flow distribution	−	−	−	o	−	−	−	+	o	−	×
Heat transfer in covered core	+	+	+	+	o	−	+	+	+	+	+
Heat transfer in partially uncovered core	o	o	+	+	−	−	+	+	+	o	o
Heat transfer in steam generator primary side	+	+	+	+	+	−	+	+	+	+	+
Heat transfer in steam generator secondary side	o	+	+	+	o	−	+	o	+	+	+
Pressurizer thermal-hydraulics	o	o	o	o	−	o	+	o	o	+	+
Surge line hydraulics (CCFL, chocking)	o	o	o	o	−	−	+		−	o	o
One and two-phase pump behaviour	o	+	+	+	−	−	o	−	o	+	+
Structural heat and heat losses	o	o	o	o	o	−	−	o	o	+	+
Noncondensable gas effect on leak flow	−	+	o	o	−	−	−	−	−	×	×
Phase separation in T-junctions	o	o	+	+	o	−	−	+	+	−	+
Thermal-hydraulic nuclear feedback	−	−	−	−	−	−	−	−	−	×	×
Boron mixing and transport	−	−	−	−	−		−	−	−	×	×
Separator behaviour	−	−	−	−	−	−	−	−	−	×	×

^(°) The best performance of the code is considered due to number of submissions.
Note: the following symbols are used in this table; for test facility versus phenomenon: + suitable for code assessment, o limited suitability, − not suitable, for phenomenon versus experiments: + experimentally well defined, o occurring but not well characterised, − not occurring or not measured, for phenomenon versus code calculation: + well predicted, o qualitatively predicted, − not predicted, × not applicable.