International Journal of Nuclear Energy

Research Article

RELAP5 Analyses of ROSA/LSTF Experiments on AM Measures during PWR Vessel Bottom Small-Break LOCAs with Gas Inflow

Table 3

Chronology of major events in LSTF tests.
EventTime (s)
SP3SP4SP6
Break valve open000
Scram signal250248250
Safety injection signal340340340
Stop of primary coolant pumps500499501
Onset of SG depressurization and AFW injection945941947
Onset of 2nd SG depressurizationNoneNone4550
Termination of AFW injection2750None6720
Initiation of ACC system326016503280
Termination of ACC system709034205680
Onset of noncondensable gas inflow to primary system719037505990
SG secondary-side collapsed liquid level drop to 2 m8070NoneNone
Initiation of automatic core power reduction at maximum cladding surface temperature above 908 K9180None9150
Actuation of LPI system9280103709490
Core power off98801160010065
Break valve closure99351160910069