Abstract
The graphitic material A3-3 is used as matrix for coated fuel particles in the fuel elements of high temperature helium cooled reactors. The diffusion coefficient of strontium in the matrix is needed to estimate the core release rate of the radiologically important 90Sr. The diffusion of 85Sr in the graphitic Matrix A3-3 was studied in vacuum and in hydrogen at a pressure of 50 Pa by use of the thin film technique with vapor deposited carrier-free 85Sr as a source. The penetration profiles obey Fick's second law. In a vacuum D(vac) = 100 exp(−3.14KT) cm2 s−1 in the temperature range of 1170 < T(K) < 1870, while D(H2) = 20 exp(t-2.51/kT) cm2s−1 at a hydrogen partial pressure of pH2 = 50 Pa in the temperature range 1170 < T(K) < 1540. D(H2)D(vac) ∼-100 at 900°C. D(H2) and D(vac) are independent of the degree of oxidation in the burn-off range (< 2 wt%) studied.
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