Community Research and Development Information Service - CORDIS

Abstract

In a gas-cooled nuclear power plant the gas side of the heat exchanger tubes becomes contaminated with radioactive deposits carried from the reactor in the coolant stream. In order to dispose of the heat exchangers in the safest and most cost-effective way during plant decommissioning, the deposits have to be removed. In situ chemical decontamination is considered to be the only viable method. This paper describes the research and development of chemical decontamination methods for the Windscale AGR heat exchangers, and the testing of a selected method on an in situ superheater. The research involved characterisation of tube corrosion and radioactivity deposits, laboratory testing of chemical reagents on actual tube samples, and the provision and operation of a plant to apply the selected reagent. Disposal of radioactive effluent is an important consideration in chemical decontamination and, in the present case, was the major factor in determining the process.

Additional information

Authors: CROSSLEY H, UKAEA, Windscale Nuclear Laboratories, Sellafield, Seascale (GB);WAKEFIELD J R, UKAEA, Windscale Nuclear Laboratories, Sellafield, Seascale (GB)
Bibliographic Reference: EUR 13337 EN (1991) 34 pp., FS, ECU 5
Availability: (2)
ISBN: ISBN 92-826-2393-9
Record Number: 199110547 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en