National Report of The Slovak Republic , september 2001

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2.5.1 Description of the technology used

ISFSF represents a nuclear installation serving temporary and safe storage of spent nuclear fuel from WWER reactors prior to its further processing at reprocessing plant or prior to its final disposal. It was commissioned in 1986.

The initial status of the facility has been described in the National Report of September 1998.

The interim spent fuel storage facility was upgraded to increase its storage capacity, extend service life and raise its seismic resistance. The overall ISFSF storage capacity following the upgrading and raising of seismic resistance has been tripled as compared to the initially designed one. The capacity is being gradually increased by replacing the original T-12 containers by compact containers, and will be sufficient to store all spent nuclear fuel produced during the operation of NPP V-1 and V-2 units. Replacement of containers is expected to be completed by 2007. A computer-controlled handling equipment serves the purposes of moving spent fuel from original into new compact containers.

Raising of seismic resistance of the construction and technological parts was performed according to the project in 1999.

Owing to the increased demands on removal of residual heat from spent fuel, the original cooling system of pool waters has been replaced by a new one. The system consists of two plate coolers (one being a 100% stand-by) and 4 pumps. Heat from cooling water is removed of by an autonomous system of cooling water comprising 3 cooling micro-towers and 2 circulation pumps (one of them as a 100% stand-by).