Analysis of QUENCH-ACM Experiments Using SCDAP/RELAP5

Birchley, J.; Stuckert, J.
October 2011
Journal of Energy & Power Engineering;Oct2011, Vol. 5 Issue 10, p918
Academic Journal
The QUENCH experimental programme at Karlsruhe Institute of Technology investigates heat-up and reflooding of a core under severe accident conditions, but while the geometry is still mainly rod-like. The recent QUENCH-ACM series of experiments, TM comprising QUENCH-12 (E110 cladding alloy), -14 (M5� alloy) and -15 (Zirlo� alloy), together with QUENCH-06 (reference case, Zircaloy-4 alloy) addressed the effect of alternative cladding materials on oxidation and quenching under similar conditions. Superficial inspection of the experimental results reveals only minor differences in the thermal and oxidation response, except for the much larger hydrogen release during reflood in QUENCH-12. Post-test calculations were performed using a version of SCDAP/RELAP5/MOD3.2, modified to represent the QUENCH facility and to invoke alternative oxidation correlations. The calculations agreed rather well with experiments QUENCH-06, -14 and -15, but the significant hydrogen release during reflood in QUENCH-12 was not captured. Closer examination of the experimental results reveals further differences between QUENCH-12 which may be linked to breakaway oxidation of the E110 cladding. The analyses support the heuristic observation that there was no TM major difference between the influence of Zircaloy-4, M5� or Zirlo , but the E-110 exhibited a contrasting behaviour with a consequent impact on the reflooding.


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