CORROSION INVESTIGATIONS OF THE ASSEMBLY CHANNELS OF BLOCK-I OF KURSKATOMIC POWER-STATION

The corroded condition of four assembly channels was investigated afte r various service times. The inner surface of three of them in contact with the aqueous heat carrier was subjected to local nodule corrosion , the depth of which depends upon the neutron fluence. Within the scop e of the electrochemical mechanism of the corrosion process an express ion for the predicted thickness of the corrosion film of a nodule and an equation for calculation of the error are proposed. The linear regr ession method also provides close results in prediction for 20 years o f service.