Coupled thermal structural analysis of LWR vessel creep failure experiments

Investigations on in-vessel melt retention by external cooling for a generic VVER-1000 reactor

“…To give an example for typical dimensionless velocity and temperature profiles in the SBL, an available CFD calculation for a FOR-EVER test has been analysed (Willschütz et al, 2001). The profiles in the STL-TML separation plane are shown in Fig.…”

In-Vessel Core Degradation

“…Finite element models were developed for pre-and post-test calculations [56] [62]. The transient temperature field was calculated as well by CFD as by the ECM approach described later (see the Section 2.6.6).…”

“…The creep function f comprises the primary creep stage (€ 3 cr < 0) and the secondary creep stage (€ 3 cr ¼ 0), whereas the decreasing creep resistance of the material in the tertiary stage (€ 3 cr > 0) is realized by the damage coupling, that is, by the factor (1 -D) -1 . One possibility of quantifying the material damage increment is based on plastic and creep strain[56] [57]: frac ðs; TÞ being the creep fracture strain of the uniaxial creep test at constant stress and temperature and 3…”

Structural integrity investigation for RPV with various cooling water levels under pressurized melting pool

“…Accordingly, the RPV failure is determined as time-and temperature-dependent process. In disclosing the complexity of the structural behaviors, several experimental programs such as FOREVER, USNRC/SNL, CORVIS, and LIVE had been performed (Willschutz et al, 2001(Willschutz et al, , 2006Nicolas et al, 2003;Adroguer et al, 2003;Gaus-Liu et al, 2010;Buck et al, 2010), the results of which validated the predictability on the failure time, mode and site by using the finite element method (FEM). The already conducted experiment span a wide range of pressure (0.2-10 MPa) and temperature gradient (130-1500 • C) (Theofanous et al, 1997).…”