RELAP5 Calculations of Bethsy 9.1b Test

Table 4

Initial conditions for Bethsy 9.1b test.

Parameter	Measured	MOD2 (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 ± 30	2864	2864	2864	2864	2864	2864
Cold leg temperature (per loop) (K)	559.9 ± 0.5	560.3	560.3	560.3	559.35	559.8	559.35
Downcomer mass flow rate (kg/s)	150.0 ± 5.0	151	152.7	154.3	154.1^a	150.0	155.4
Reactor coolant pump speed (per loop) (rpm)	2940 ± 30	2970	2970	2940	2970	2970	2970
Pressurizer pressure (MPa)	15.51 ± 0.09	15.51	15.51	15.51	15.51	15.51	15.51
Pressurizer level (m)	4.08 ± 0.1	N.A.	N.A.	4.12	4.08	4.08	4.08
Reactor coolant system mass (kg)	1960	1948	1948	1948	1948	1949	1948
Secondary side pressure (per SG) (MPa)	6.91 ± 0.04	6.83	6.81	6.81	6.74	6.81	6.76
Steam generator level (per SG) (m)	13.45 ± 0.05	13.44	N.A.	13.45	13.20	13.14	13.25
Feedwater temperature (K)	491.1 ± 2.0	491.0	491.0	491.0	491.0	491.0	491.0
Secondary coolant mass (per SG) (kg)	820 ± 30	800	819	821	790	790	790
RCS trace heating (kW)	107.5	107.5^a	107.5^a	107.5^a	107.5^a	107.5^a	107.5^a

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