KOBAU supports the pilot project “Special quiver for fuel assemblies”.
First successful loading of a Castor with a lower number of fuel assemblies.
For the removal of the last 87 fuel assemblies from Unterweser NPP, the colleagues of KOBAU and the power plant operator were confronted with a special challenge: instead of the standard loading of the Castors with 19 fuel assemblies (Castor V / 19) required for a pressurized water reactor, the operator needed a solution how to load the Castors with a smaller number of fuel assemblies while still meeting the high (legal) safety standards.
The clever solution of the specialists was a specially designed quiver for the Castor-container for the fuel assemblies which would allow for a safe storage and transportation even in a smaller number. A process that was additionally developed in the course of the solution, made it possible to insert the fuel assemblies into the quiver inside the holding basin of the NPP under water. Both, construction and process, had to be qualified and approved by the Federal Office for Radiation Protection – an understandable measure considering the cargo. Thanks to the extensive expertise – also by the colleagues of KOBAU – the loading of the quiver and the subsequent loading of the Castor with the quiver could be completed smoothly.
The same challenges will be faced by other nuclear power plants in the near future as soon as they have to remove their last fuel assemblies. Due to the positive experiences gained during the successful pilot project at the Unterweser NPP, the KOBAU colleagues have already successfully supported those responsible at the Biblis NPP during the loading of the quiver on site in the Biblis NPP.
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