Science and Technology of Nuclear Installations / 2012 / Article / Tab 4

Research Article

RELAP5 Calculations of Bethsy 9.1b Test

Table 4

Initial conditions for Bethsy 9.1b test.

ParameterMeasuredMOD2 (S)MOD3 (M)MOD3.1 (M)MOD3.1 (C)MOD3.2 (L)MOD3.2 (C), MOD3.3 (C), MOD3.3 P3 (C), MOD3.3 P4 (C)

Core thermal power (kW)2864 ± 30286428642864286428642864
Cold leg temperature (per loop) (K)559.9 ± 0.5560.3560.3560.3559.35559.8559.35
Downcomer mass flow rate (kg/s)150.0 ± 5.0151152.7154.3154.1a150.0155.4
Reactor coolant pump speed (per loop) (rpm)2940 ± 30297029702940297029702970
Pressurizer pressure (MPa)15.51 ± 0.0915.5115.5115.5115.5115.5115.51
Pressurizer level (m)4.08 ± 0.1N.A.N.A.4.124.084.084.08
Reactor coolant system mass (kg)1960194819481948194819491948
Secondary side pressure (per SG) (MPa)6.91 ± 0.046.836.816.816.746.816.76
Steam generator level (per SG) (m)13.45 ± 0.0513.44N.A.13.4513.2013.1413.25
Feedwater temperature (K)491.1 ± 2.0491.0491.0491.0491.0491.0491.0
Secondary coolant mass (per SG) (kg)820 ± 30800819821790790790
RCS trace heating (kW)107.5107.5a107.5a107.5a107.5a107.5a107.5a

aNo heat losses considering when the trace heating system is on; rather, heat losses are simulated after accumulator emptying.

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