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Summary It is important that the levels of dissolved and particulate corrosion product species in the coolant should be monitored, and in particular there is a need for information on the contribution made by the CVCS and auxiliary systems. The present philosophy of coolant chemistry control, which underlies the various coordinated chemistry regimes, is based on a model of in-core corrosion product deposition in which deposition is favoured when the solubility of iron in the boundary layer near the surface is lower than that in the bulk coolant.

Henet concludes that acidic deviations are clearly unfavourable, but that no conclusion about the optimum operation pH can be drawn and that there is no (reactors 2 - 4 ) with particular emphasis on Ringhals 4. This work has been reviewed by Gott et al [521. The variation of SG channel head dose rate with time at which high 'constant pH' chemistry was introduced is shown in Figure 28. The coolant chemistry regimes for the three reactors between 1983 and 1986 are shown in Figure 29. 4. 4 until the end of the cycle.

The present specification is widely agreed, but in view of some concerns with regard to the effect of hydrogen on cracking of steam generator tubes, operation at the lower end of the permitted band seems advisable. experience in this area should be carefully monitored, with particular attention being paid to French plant. In order to keep negative pH deviations to a minimum any load following operations will require a detailed lithium surveillance and correction programme. 9. Summary It is important that the levels of dissolved and particulate corrosion product species in the coolant should be monitored, and in particular there is a need for information on the contribution made by the CVCS and auxiliary systems.

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Coolant Tech. of Water-Cooled Reactors Vol 3 [Activity Xport Mech] (IAEA TECDOC-667v3)


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