The Japan Power Demonstrating Reactor (JPDR) decommissioning program
for the demonstration of the safe dismantling of nuclear power plants
finished successfully, in March 1996. The lessons learnt from the JPDR
program will be used for the increase in safety and reasonability. JAERI
has been developing a computer system, in which dismantling work is
simulated and evaluated, by analyzing the radiation field, the work
environment including equipment location and behavior of the remote
dismantling tools, which are varying as the dismantling proceeds (Fig.
6-14 (a)).
In this system, the original data on work environments, three-dimensional
geometry of equipment and structures, and radioactivity inventory, etc.
are input, and then, the field of dismantling work and its radioactive
level are displayed on the computer (Fig. 6-14 (b)). By indicating the
particular equipment for dismantling and the cutting section of it,
interferences on the transfer route, the suitability of remote handling
tools and the change of radiation fields etc. are displayed (Fig. 6-14
(c)).
Moreover, the computer calculates the times necessary for cutting and
transfer, the radiation doses and the secondary wastes etc., and files
them in the database. It also displays the movement of equipment and
the change of work environment as a moving picture. Once the basic data
are input, it enables us to analyze easily the various dismantling procedures.
This computer simulation facilitates the evaluation of general dismantling
steps, together with the functions needed for dismantling tools. |
