Thermodynamic study of α-Cs2Pb(MoO4)2 and safety assessment of the Pb-JOG interaction in lead-cooled fast reactors
Andries van Hattem (TU Delft - Applied Sciences)
John Vlieland (TU Delft - Applied Sciences)
Eric Colineau (European Commission - Joint Research Centre)
Jean Christophe Griveau (European Commission - Joint Research Centre)
Rudy J.M. Konings (TU Delft - Applied Sciences)
Anna L. Smith (TU Delft - Applied Sciences)
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Abstract
The chemistry following cladding failure in Lead-cooled Fast Reactors involves the interaction between lead (Pb) coolant and the Joint Oxyde Gain (JOG)-phase, mostly composed of dicesium molybdate (Cs2MoO4). A thermodynamic analysis of coolant-JOG phase chemical interaction as studied via the scenario of Pb-Cs2MoO4 chemical interaction is reported. Measurements of the standard thermodynamic properties of α -Cs2Pb(MoO4)2 are presented. The enthalpy of formation of α -Cs2Pb(MoO4)2 is measured to be -(2570.7 ± 2.3) kJ · mol−1 using solution calorimetry, while the standard entropy is determined to be (399 ± 12) J · K−1·mol−1 using thermal-relaxation calorimetry. Thermodynamic calculations show that Cs2Pb(MoO4)2 is in several cases thermodynamically stable under conditions typical for operation of Lead-cooled Fast Reactors. This means Cs2Pb(MoO4)2 can form in cladding failure scenarios.
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