Science and Technology of Nuclear Installations / 2012 / Article / Tab 5

Research Article

RELAP5 Calculations of Bethsy 9.1b Test

Table 5

Sequence of main events for Bethsy 9.1b test.

EventsTime (s)
ExpMOD3.3 P4 (C)MOD2 (S)

Break opening000
Scram signal (13.1 MPa)413239
Safety injection signal (11.9 MPa)505454
Main feedwater off, turbine bypass545858
Core power decay start (17 s after scram)584956
Auxiliary feedwater on (30 s after SI signal)828484
Pump coastdown start (300 s after SI signal)356354354
End of pump coastdown971969969
Start of the first core level depletion183018411760
Start of second core uncover218021022060
Ultimate procedure initiation256223752410
Accumulator injection start (4.2 MPa)296227502840
Primary mass inventory is minimum297027502840
Maximum core cladding heatup305329102900
Accumulator isolation (1.5 MPa)383138093888
Low-pressure injection system start (0.91 MPa)517756275139
End of test/calculation8200 to 833083308900

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