Table 1: Comparison of initial conditions for BETHSY 6.2TC test.

ParameterMeasuredRELAP5TRACE

Core thermal power (kW) 2 8 6 3 ± 3 0 28642860
Pressurizer pressure (MPa) 1 5 . 3 8 ± 0 . 1 5 15.3815.38
Pressurizer level (m) 7 . 4 5 ± 0 . 2 7.457.45
Total flow (kg/s)16.81 (calculated from core power)16.8416.61
Core inlet temperature (K) 5 5 7 . 2 ± 0 . 4 557.2557.2
Core outlet temperature (K) 5 8 8 . 2 ± 0 . 4 588.1588.8
Reactor coolant system mass (kg) 1 9 8 4 ± 5 0 19481948
Secondary side pressure per SG (MPa) 6 . 8 4 ± 0 . 0 7 6.836.69
Steam generator level per SG (m) 1 1 . 1 ± 0 . 0 5 11.111.1
Feedwater temperature (K) 5 2 3 . 2 ± 4 523.2523.2
Heat loss (kW)54.82N.A.N.A.
Downcomer to upper head flow (kg/s)0.0470.0470.047