Safety Analyses of Slovak Steam Generators and the Latest Upgrades

3 Safety Analyses of Slovak Steam Generators and the Latest Upgrades 

The safe and reliable operation of steam generators is essential to the safe operation of the whole NPP, but it is also crucial to the economic parameters for the unit. The steam generator must be able to transfer the heat from the reactor in all regimes during normal operation or when an accident has occurred. 

Based on operational experience, mitigating damage and leak tightness defects in pipelines or collectors takes up much more time and money than prevention mea- 

Based on experiences from Finland, other countries (including Slovakia) have changed the old feed water piping systems of the SGs in their NPPs. At this point, it is worth noting that the incident at unit 2 of the Paks NPP (Hungary, 2003) related to the cleaning of fuel assemblies in a special tank, which was necessary due to insufficient passivation of the pipelines in the SG after steam water pipe system exchange in 1997. 

A detailed description of the VVER-440 steam generators delivered to Bohunice NPP is provided in [200-202]. The safety analyses were performed in 1977 by OKB 

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