Corrosion sampling from primary coolant

Since both reactions are induced by fast neutrons having energies >10MeV, the total amount of Co released from the materials to the primary coolant of a 1300MWe PWR was calculated to be only on the order of 10" Bq per year (Sie-mens/KWU, unpublished). In this calculation, the essential radionuclide sources were assumed to be corrosion product deposits on the fuel rods as well as corrosion and/or wear from in-core materials. This low production rate raises the question of whether the y rays at 122 and 136 keV occasionally detected in waste water really belong to Co or whether they are caused by side-peaks originating from the decay of other radionuclides present in the samples. 

The considerable length of the lines from the primary circuit to the sampling station in or near the laboratory can cause difficulties in obtaining representative samples for analysis. Since a fraction of the corrosion products in the coolant is in... 

Large, N. R., Mead, S., Nichols, J. L., Patel, N. M., Lawson, D., Beckett, N. A. Studies of problems of corrosion product sampling from PWR primary coolant. Proc. 5. BNES Conf. Water Chemistry of Nuclear Reactor Systems, Bournemouth, UK, 1989, Vol. 1, p. 63-70... 

---