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Radioelement Behaviour in a Cementitious Environment

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Abstract

The Nirex Safety Assessment Research Programme (NSARP) comprises scientific research to support the safety assessment of a deep geological repository for low- and intermediate-level radioactive wastes. The NSARP addresses several areas of research, one of which is a continuing investigation of the behaviour of radioelements in a cementitious environment. This paper draws together recent experimental measurements of solubility and sorption under such conditions, along with the results of interpretive thermochemical and sorption modelling. Under conditions similar to those expected in the repository, the predicted solubility of selenium is about 3xl0−8M. Experimental measurements confirm that at low redox potential the solubility of selenium is substantially less than that previously observed under an air atmosphere, and is closer to the predictions of the thermochemical modelling. The solubility of sodium stannate has been studied after heating solutions at 50, 80 and 200°C. Crystalline tin solids were formed at all temperatures. For solutions heated at 200°C the solids were identified as cassiterite. The solubilities of all of the crystalline solids were 1x10−6M to 1x10−9M which are at least five orders of magnitude lower than that of the original sodium stannate. Distribution ratios (Rd) between 1x103 and 5x103 ml g-1 have been measured for the sorption of tetravalent technetium on to a cementitious material. Preliminary results from an in-diffusion experiment involving americium and an intact cement sample are in good agreement (at 1sx104 ml g-1) with Rd values determined from previously reported batch sorption experiments.

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References

  1. Preliminary Environmental and Radiological Assessment and Preliminary Safety Report, UK Nirex Report No. 71, 1989.

  2. A. Atkinson, UKAEA Report AERE-R11777, 1985.

  3. S.M. Sharland, P.W. Tasker, and C.J. Tweed, UKAEA Report AERE-R12442, 1986.

  4. H.P. Thomason and S.J. Williams, Nirex Report NSS R128, 1991.

  5. S. Bayliss, R.M. Howse, R McCrohon, P Oliver, J.L. Smith-Briggs and H.P. Thomason, Nirex Report NSS R124, 1991.

  6. B.F. Greenfield, A.D. Moreton, M.W. Spindler, S.J. Williams and D.R. Woodwark, presented at the 1991 MRS Fall Meeting, Strasbourg, France, 1991 (unpublished).

  7. A. Atkinson, A.W. Harris, C.C. Naish, S.M. Sharland and A.C. Smith, presented at the 1991 MRS Fall Meeting, Strasbourg, France, 1991 (unpublished).

  8. N.J. Pilkington, P.J. Shadbolt and J.D. Wilkins, Nirex Report NSS/R1 16, 1989.

  9. S. Bayliss, F.T. Ewart, R.M. Howse, S.A. Lane, N.J. Pilkington, J.L. Smith-Briggs and S.J. Williams, in Scientific Basis for Nuclear Waste Management XII, edited by W. Lutze and R.C. Ewing (Mater. Res. Soc. Proc. 127, Pittsburgh, 1989) pp.879–885.

    Google Scholar 

  10. D.L. Parkhurst, D.C. Thorstenson and L.N. Plummer, Report USGS/WRI 80-96, NTIS Tech. Rep. PB81-167801, 1980, Revised 1985.

  11. J.E. Cross, F.T. Ewart and C.J. Tweed, UKAEA Report AERE-R12324, 1986.

  12. P.L. Brown, A. Haworth, S.M. Sharland, and C.J. Tweed, Nirex Report NSS/R188, 1989.

  13. J.E. Cross and F.T. Ewart, Nirex Report NSS/R212, 1990.

  14. B. Baeyens and I. McKinley, Nagra technical report NTB 88-28, 1989.

  15. R.E. Meyer, W.D. Arnold, F.I. Case and G.D. O’Kelly, US Nuclear Regulatory Commission Report, NUREG/CR-5235, 1989.

  16. K. Schwochau, Angewandte Chemie 76, 9–19 (1964).

    Article  CAS  Google Scholar 

  17. D.A. Lever, UKAEA Report AERE-R12321, 1986.

  18. F.T. Ewart and P.W. Tasker, Proc. Symp. Waste Management 87, Vol. 3, 1987, p. 71

    Google Scholar 

  19. P.L. Brown, A. Haworth, R. McCrohon, S.M. Sharland, and C.J. Tweed, in Scientific Basis for Nuclear Waste Management XIII, (Mater. Res. Soc. Proc. 176, Pittsburgh, 1990) pp. 591–598.

    Google Scholar 

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Acknowledgements

This work was funded by UK Nirex Ltd. as part of their Safety Assessment Research Programme. Their support and permission to publish the work are gratefully acknowledged.

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Authors and Affiliations

  1. AEA Technology, Harwell Laboratory, Oxfordshire, OX11 ORA, UK

    S. Bayliss, A. Haworth, R. McCrohon, A. D. Moreton, P. Oliver, N. J. Pilkington, A. J. Smith & J. L. Smith-Briggs

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  1. S. Bayliss
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  2. A. Haworth
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  3. R. McCrohon
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  4. A. D. Moreton
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  5. P. Oliver
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  6. N. J. Pilkington
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  7. A. J. Smith
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  8. J. L. Smith-Briggs
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Bayliss, S., Haworth, A., McCrohon, R. et al. Radioelement Behaviour in a Cementitious Environment. MRS Online Proceedings Library 257, 641–648 (1991). https://doi.org/10.1557/PROC-257-641

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  • DOI: https://doi.org/10.1557/PROC-257-641

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