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$^{110}$mAg behaviour in PWRs Lessons learnt from the EMECC campaigns

Abstract : For 45 years, most of the time in collaboration with EDF, CEA has measured the contamination of PWR circuits by gamma spectrometry using the so-called EMECC device. These measurements allow to determine the surface activities accurately in order to study the behaviour of the activated corrosion products.In case of pollution by $^{110}$mAg, the main lessons learnt from EMECC campaigns and primary coolant filtering campaigns as well are as followsDuring oxygenation, $^{110}$Ag dissolves from the primary surfaces and precipitates on the cold parts of auxiliary systems before dissolving slowly from these cold parts. It leads to a sharp increase of dose rate at the vicinity of the cold parts of auxiliary systems.Because of the precipitation on the Nuclear Sampling System (NSS), 110mAg sampled via the NSS is not representative of the $^{110}$Ag volume activity of the Reactor Coolant System.Under oxidizing and acid conditions, Ag is trapped very well by cation exchange resins. On the other hand, silver is in an insoluble form (colloids) in a reducing medium and it is not trapped by ion exchangers.
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F. Dacquait, M. Bultot, G. Pipet, J. Francescatto, F. Broutin, et al.. $^{110}$mAg behaviour in PWRs Lessons learnt from the EMECC campaigns. NPC 2016 (Nuclear Plant Chemistry) - International Conference on Water Chemistry of Nuclear Reactor Systems, Oct 2016, Brighton, United Kingdom. ⟨cea-02439456⟩

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