Background
The overall goal of the project was to improve the existing systems and methods for in-service diagnostic of corrosion condition of secondary circuit equipment and to elaborate computer calculation codes for resource estimation in the following areas:

• Improvement of performance of automatic water chemistry control systems and increase reliability of diagnostics by considering abnormal water chemistry regimes;
• Elaboration of methods for resource estimations based on actual water chemistry condition and deviations from prescribed values;
• Scientific substantiation from the water chemistry point of view of safety limits for both operating and planned NPPs of VVER type.

Methods and equipment for pH and corrosion potential measurement working parameters had to be adapted for VVER-steam generator construction. Under this project, the computer codes and their documentation for estimation of the rate of corrosion-erosion and for establishment of the corrosion cracking procedures were provided through the TACIS On-Site Assistance at Kalinin NPP.
Objective
As a result of the studies conducted by the TACIS On-Site Assistance Consultant, it was shown that a tight chemistry control of the secondary side was required, so as to rapidly detect any deviation of the chemical control parameters that could endanger the behaviour of the secondary side equipment in general, and particularly the behaviour of the steam generators.
The OSA Consultant recommended that the TACIS programme should provide:

• the secondary side of both units of Kalinin NPP with accurate and reliable in-line monitoring systems for the main chemical control parameters;
• the laboratory of Kalinin NPP with analytical devices to accurately measure the species which cannot be detected by the in-line monitoring systems and which are essential to get a comprehensive view of the chemical conditions in the sensitive locations of the secondary side.

The objective of the present contract was to purchase the equipment for the in-line monitoring system for Unit 1 of Kalinin NPP. The laboratory equipment was purchased under separate contracts (also R1.03/92A). The in-line monitoring equipment for Unit 2 was purchased under the TACIS 1994 programme (see R1.03/94A).
The equipment purchased under the present contract included:

• 6 in-line Na+ monitors for the condenser hotwell water
• 4 in-line Na+ monitors for the steam generator blowdown
• 1 in-line Na+ monitor for the steam generator blowdown processing system
• 1 in-line dissolved oxygen monitor for the extraction water
• 2 in-line dissolved oxygen monitors for the feedwater
• 2 Cl- analysers for the laboratory
• 4 in-line cation conductivity monitors for the steam generator blowdown

Result
The contract was signed in September 1994 and the equipment was delivered at the end of October 1994.