The primary AHTR candidate salts are fluorides [16]. In general, the key factors favouring fluorides are described across a range of papers, and include: low melting points, chemical stability at higher temperatures (>800°C), compatibility with graphite (i.e. AHTR core matrix), better neutronic properties (i.e. low neutron absorption cross sections and stability in fields of high radiation, in reactor core); and, finally, their successful use and operation during the ARE and MSRE experiments (in particular; 7LiF-BeF2 or “FLiBe” was used for the MSRE) [8] [2] [26].
Chlorides are not considered in the literature, because of their higher thermal-neutron-absorption cross sections [2], and undesirable neutron activation properties (generation of 36Cl, a long lived radionuclide) [16]. Nitrates, sulfates and carbonates are oxygen containing salts, and are also not relevant for the primary AHTR coolant. At the higher temperatures, they are not as stable as fluorides, and they decompose to release oxygen, which corrodes carbon composites
The primary AHTR candidate salts are fluorides [16]. In general, the key factors favouring fluorides are described across a range of papers, and include: low melting points, chemical stability at higher temperatures (>800°C), compatibility with graphite (i.e. AHTR core matrix), better neutronic properties (i.e. low neutron absorption cross sections and stability in fields of high radiation, in reactor core); and, finally, their successful use and operation during the ARE and MSRE experiments (in particular; 7LiF-BeF2 or “FLiBe” was used for the MSRE) [8] [2] [26].Chlorides are not considered in the literature, because of their higher thermal-neutron-absorption cross sections [2], and undesirable neutron activation properties (generation of 36Cl, a long lived radionuclide) [16]. Nitrates, sulfates and carbonates are oxygen containing salts, and are also not relevant for the primary AHTR coolant. At the higher temperatures, they are not as stable as fluorides, and they decompose to release oxygen, which corrodes carbon composites
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