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Measurement of Gap and Grain-Boundary Inventories of 129I Used in Candu Fuels

  • S. Stroes-Gascoyne (a1), D. L. Moir (a1), M. Kolar (a1), R. J. Porth (a1), J. L. McConnell (a1) and A. H. Kerr (a1)...

Abstract

Combined gap and grain-boundary inventories of 129I in 14 used CANDU fuel elements were measured by crushing and simultaneously leaching fuel segments for 4 h in a solution containing KI carrier. From analogy with previous work a near one-to-one correlation vas anticipated between the amount of stable Xe and the amount of 129I in the combined gap and grain-boundary regions of the fuel. However, the results showed that such a correlation was only apparent for low linear power rating (LLPR) fuels with an average linear power rating of 642 kV/m. For high linear power rating (HLPR) fuels (>44 kw/m), the 129I values were considerably smaller than expected. The combined gap and grain-boundary inventories of 129I in the 14 fuels tested varied from 1.8 to 11.01, with an average value of 3.6 ± 2.4% which suggests that the average value of 8.1 ± 1% used in safety assessment calculations overestimates the instant release fraction for 129I. Segments of used CANDU fuels were leached for 92 d (samples taken at 5, 28 and 92 d) to determine the kinetics of 129I release. Results could be fitted tentatively to half-order reaction kinetics, implying that 129I release is a diffusion-controlled process for LLPR fuels, and also for HLPR fuels, once the gap inventory has been leached. However, more data are needed over longer leaching periods to gain more understanding of the processes that control grain-boundary release of 129I from used CANDU fuel.

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1. Dormuth, K.W. and Gillespie, P.A., Atonic Energy of Canada Limited Report, AECL-10183 (1990).
2. Stroes-Gascoyne, S., Johnson, L.H. and Sellinger, D.M., Nucl. Technol. 77, 320 (1987).
3. Stroes-Gascoyne, S., Johnson, L.H., Tait, J.C. and Sellinger, D.M., Materials Research Society Symposium Proceedings 127, 301 (1989).
4. Stroes-Gascoyne, S., Tait, J.C., Garisto, N.C., Porth, R.J., Ross, J.P.M., Glova, G.A. and Barnsdale, T.R., Materials Research Society Symposium Proceedings 257, 373 (1992).
5. Stroes-Gascoyne, S., Tait, J.C., Porth, R.J., McConnell, J.L., Barnsdale, T.R. and Vatson, S., Materials Research Society Symposium Proceedings 294, 41 (1993).
6. Stroes-Gascoyne, S., Johnson, L.H., Sellinger, D.M/, and Wilkin, D.L., Atomic Energy of Canada Limited Report AECL-10574 (COG-92–31) (1992).
7. Tait, J.C., Stroes-Gascoyne, S., Porth, R.J., Wood, D. and Heimann, R.B., Materials Research Society Symposium Proceedings 127, 309 (1989).
8. Tait, J.C., Stroes-Gascoyne, S., Hocking, W.H., Duclos, A.M., Porth, R.J. and Wilkin, D.L., Materials Research Society Symposium Proceedings 212, 189 (1991).
9. Stroes-Gascoyne, S., J. Nucl. Mat. 190, 87 (1992).
10. Johnson, L.H. and Shoesmith, D.W., In: Radioactive Waste Forms for the Future (Lutze, W. and Eving, R.C., editors) Elsevier Science Publishers: 635 (1988).
11. Garisto, N.C., Johnson, L.H. and Hocking, W.H., In: Second International Conference on CANDU Fuel, Conference Proceedings, Pembroke, Ontario, 352 (1989).
12. Johnson, L.H., Shoesmith, D.V., LeNeveu, D.M., Garisto, N.C., Oscarson, D.W., Gray, M.N. and Lemire, R.J., Atomic Energy of Canada Limited Report AECL-10714 (C0G-93–04) (1994).
13. Stroes-Gascoyne, S. and Sellinger, D.M., In: First International Conference on CANDU Fuel, Conference Proceedings, Chalk River, Ontario, 383 (1986).
14. Notley, M.J.F., Nucl. Technol. 44, 445 (1979).
15. Vasyvich, K.V., Atomic Energy of Canada Limited Report, AECL-10463 (C0G-91–340) (1993).
16. Floyd, M.R., Novak, J. and Truant, P.T.. Atomic Energy of Canada Limited Report, AECL-10636 (1992).
17. Stroes-Gascoyne, S., Johnson, L.H. and Tait, J.C., Grain-Boundary Inventories in Used CANDU Fuels, in preparation (1995).
18. Gray, V.J. and Strachan, D.M., Materials Research Society Proceedings 212, 205 (1991).
19. Gray, V.J., Strachan, D.M. and Wilson, C.N., Materials Research Society Proceedings 257, 353 (1992).

Measurement of Gap and Grain-Boundary Inventories of 129I Used in Candu Fuels

  • S. Stroes-Gascoyne (a1), D. L. Moir (a1), M. Kolar (a1), R. J. Porth (a1), J. L. McConnell (a1) and A. H. Kerr (a1)...

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