Corrosion product measurements at Sizewell B PWR

Corrosion product concentrations and surface activities have been measured during hot functional tests and cycles I to 4 at Sizewell B, in a programme aimed at understanding corrosion product behaviour and radiation field build-up. The results are discussed in terms of primary coolant chemistry, sample line effects, passivation, radiation fields and, for shutdown and start-up, the origins of the corrosion products released into the primary coolant.