PSI - Issue 60

Keshav Mohta et al. / Procedia Structural Integrity 60 (2024) 36–43 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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7

Fig. 3. Modeled heat exchanges for thermal hydraulic analysis

Fig. 4. FE model of Calandria end shield assembly for structural analysis

Table 1. Timeline of key events during the accident progression till Calandria failure. Key event/ parameter Standard 220 MWe PHWR

540 MWe PHWR

Time between initiating event and the complete core collapse (LCDA and transition to SCDA) Core collapse (initial condition for the present analysis) Calandria vault water level falls till the top of the Calandria Calandria vault water level falls till the bottom of the Calandria

7.8 h

5 h

T0

T0

T0 + 36 h T0 + 73 h T0 + 83 h

T0 + 36 h T0 + 63 h T0 + 71 h

Calandria failure