US Dept. of Energy |
Office of International
Nuclear Safety and Cooperation
1000 Independence Ave S.W.
Washington, DC 20585
An important objective during a nuclear power plant emergency is
to avoid the release of radioactive materials to the environment. At Kola
Unit 2 in Russia, new, highly efficient valves have been installed to
contain steam and radioactive fission products in an accident. The new
valves were installed in the piping of the existing confinement system.
These new confinement isolation butterfly valves are designed to
spring into action through a system of sensors and actuators. When a
sensor detects an abnormal situation, it will signal an actuator to close
the correct valve(s).
A total of 11 confinement isolation
valves, valve actuators and sensors were manufactured by U.S.-based
Enertech (and supplied in conjunction with another U.S. firm, Burns & Roe)
and were installed in the ventilation system piping.
The confinement isolation valves provided at
Kola offer numerous features that will ensure a long operating life and
enhanced nuclear power plant safety. The valves are nuclear grade, and are
manufactured to meet exacting standards for precision and service. The
seating components are laminated stainless steel coupled with a graphite
seat ring. This metal-to-metal seat requires little, if any, maintenance.
Because the seat is retained within the body of the valve, there is
reduced seat erosion.
The valves are designed to perform well
under severe operating conditions. In the Kola reactors, the valves have
been installed near the confinement wall penetrations through which the
ventilation system passes.