Science and Technology of Nuclear Installations / 2010 / Article / Tab 1

Research Article

CATHARE Assessment of PACTEL LOCA Experiments with Accident Management

Table 1

Test T2.1: Timing of the main events, CATHARE versus experiment

EventTime [S] Exp.Time [S] PretestTime [S] Posttest Comment

Start of calculation-1500-5000-5000Stabilization
Opening break valve0007.4% cold leg break ( 7.8 mm)
Reactor scram000
Pumps coast-down000Coast-down linear (0–150 s)
Isolation of feedwater and steam lines000Closing time is 3 s and 10 s, respectively
Pressurizer heaters off18.918.9Level in PRZ <2.7 m
ACCU injection initiated to Downcomer to Upper plenum506060Primary pressure <5.5 MPa
END of HA injection to UP to DC450582582HA empty
Increase of fuel cladding temperature start940900920Core uncovery and heat-up start
Secondary bleed123011661202Cladding temperature >350°C,
Primary bleedCladding temperature >400°C,
LPSI start125012051244Primary pressure <0.7 MPa
Maximal fuel cladding temperature126112151267Tclad, exp = 379°C
Tclad, calc = 394°C posttest
Tclad, calc = 391°C pretest
LPSI pump switched off20002000
End of test275036002400

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