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Novovoronezh : | Operating History | Scope of DOE Activities | Accomplishments |

Novovoronezh Operating History

Upgrades and remedial actions include corrective actions at Units 3 and 4 because of reactor-vessel embrittlement problems, 1979 repairs to shut-off valves in the primary loops of Units 3 and 4 after faults were detected in welds, and painting of cables with fire-retardant material.

Before the break-up of the Soviet Union, planned upgrades for Units 3 and 4 included installation of new fast-operating valves, a new acoustic diagnostics system, replacement of emergency boron-injection pumps, additional training to help operators deal with severe accidents, upgraded operating procedures, and expansion of in-service inspection programs.

Inspections by teams of International Atomic Energy Agency (IAEA) staff in 1991 and 1993 focused on operational incidents and safety concerns. The 1993 inspections noted that, while progress had been made, the integrity of the reactor pressure vessel of Units 3 and 4 was a future critical issue. They recommended that measures should be taken to increase system redundancy and protection against common cause failures of those safety systems that cool the core. They recommended replacement of pressurizer safety valves, installation of main steam line fast isolation valves, and installation of a new emergency power supply system. Units 3 and 4 were also found to need more reliable electrical components for their safety- related equipment, better quality assurance of equipment, and better maintenance to prevent degradation of equipment.

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)

Novovoronezh : | Operating History | Scope of DOE Activities | Accomplishments |


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