RELAP5 Calculations of Bethsy 9.1b Test

Table 5

Sequence of main events for Bethsy 9.1b test.

Events	Time (s)
	Exp	MOD3.3 P4 (C)	MOD2 (S)
Break opening	0	0	0
Scram signal (13.1 MPa)	41	32	39
Safety injection signal (11.9 MPa)	50	54	54
Main feedwater off, turbine bypass	54	58	58
Core power decay start (17 s after scram)	58	49	56
Auxiliary feedwater on (30 s after SI signal)	82	84	84
Pump coastdown start (300 s after SI signal)	356	354	354
End of pump coastdown	971	969	969
Start of the first core level depletion	1830	1841	1760
Start of second core uncover	2180	2102	2060
Ultimate procedure initiation	2562	2375	2410
Accumulator injection start (4.2 MPa)	2962	2750	2840
Primary mass inventory is minimum	2970	2750	2840
Maximum core cladding heatup	3053	2910	2900
Accumulator isolation (1.5 MPa)	3831	3809	3888
Low-pressure injection system start (0.91 MPa)	5177	5627	5139
End of test/calculation	8200 to 8330	8330	8900