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Dukovany : | Operating History | Technical Activities | Accomplishments |

Dukovany Operating History

Dukovany's operating history has been essentially free of controversy. An IAEA mission to the plant in 1989 described it as having high availabilities and load factors, with a low--and decreasing--number of unplanned shutdowns. According to the IAEA team, the number of reportable events was within the normal range, and radiation exposure of plant employees was extremely low.

Inspections by teams from the IAEA have been conducted in 1989, 1990, 1991, 1993, and 1995. The 1993 visit focused on the plant's policy to prevent incidents. The team reviewed 476 events reported between 1988 and 1993, of which 383 were considered safety-relevant. It was noted that electrical system weaknesses such as cable insulations continued to undermine the reliability of electrical supplies. Deficiencies in the quality of procedures and in the maintenance and testing of 400-kV circuit breakers were also noted. The team recommended that management

  • replace 6-kV cables and install 400-kV circuit surge suppressors
  • improve means of indicating that a diesel generator is not in a normal stand-by mode
  • improve procedures to gain faster results in investigating unusual events
  • improve quality assurance measures
  • cooperate with other plants with VVER-440/V213 reactors to share experience
  • streamline reporting of events.

The 1995 inspection reviewed modernization activities, finding that the plant had addressed the IAEA-suggested improvements for VVER-440/V213 s. Additional work included strengthening the bubbler condenser structure.

Source: Source Book: Soviet-Designed Nuclear Power Plants in Russia, Ukrane, Lithuania, the Czech Republic, the Slovak Republic, Hungary, and Bulgaria, 4th edition. Nuclear Energy Institute. 1996. (online)

Dukovany : | Operating History | Technical Activities | Accomplishments |


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