R2.06/95 TACIS (Russian Federation) N.S

This project is the continuation of the TACIS 1991 project 3.8 for performing additional Severe Accident (SA) analysis of VVER 1000 scenarios with available SA codes, especially for supporting TACIS 1991 project 3.1.
The overall objectives were to transfer Western technology and experience on SA analysis and phenomenology as well as Accident Management (AM) strategies and procedures to the Beneficiary, and to assist and collaborate in the application and improvement of available SA codes to VVER plants and in the preparation of AM procedures.

One of the main problems affecting the progress and success of the project was the absence of the HP workstation, which due to the US restrictions could not be delivered for the subcontractor’s analyses. Its replacement by very powerful PCs can be considered as a reasonable substitute. Unfortunately, those were not available for the subcontractor before the final phase of the project, but they are essential for the future analyses.
An additional shortcoming was the failure in granting a long-term user license for the MAAP/VVER code for the local subcontractor, although it was indicated in the contract. This will affect the sustainability.
Nevertheless the planned outputs were achieved thanks to the effort of the Local Subcontractor. His substituting arrangements for the tasks’ implementation were essential in that respect. The level of the new Russian SA-code VESCOR, developed specifically for the VVER-1000 reactors with the assistance of the contractor, is a good achievement and partially compensates the shortcoming in respect of the MAAP/VVER availability.
For further development, however, also the Western code was considered to be very useful.