TITLE:

RECENT DECONTAMINATION EXPERIENCES IN BELGIAN NUCLEAR INSTALLATIONS USING A MOBILE UNIT.

AUTHORS:

M.Vandorpe (*), X. Bairiot (*), L. Luccardi (**)
(*) Tecnubel, S.A.
(**) LT Business Consultants, s.r.l.

This paper will present the most recent applications of nuclear chemical decontamination performed using  skid mounted modular units which allow in-situ effective decontamination, with limited radiation exposure to the system operators and power plant personnel. Two portable units are available with capacities of up to  6 m³.  The units are contained and transported in standard 20 ft containers.

The mobile units operate independently of the plant decontamination installation. After decontamination chemicals are treated either by ion exchange resins or by using the power plant chemical waste treatment facilities. After  cleaning by the ion exchanger resins, liquid waste can be discharged to the liquid waste collection drains of the power plant.

In particular the decontamination experience of an auxiliary CVCS (Chemical and Volume Control System) heat-exchanger at the Tihange 2 PWR  will be presented and the results achieved will be compared with those previously obtained using other decontamination systems.

Personnel radiation exposure actual data will be compared with those projected by calculation using a new computerized program.