Cel
THE OBJECTIVE OF THIS RESEARCH WORK IS TO DEVELOP METHODS FOR THE DECONTAMINATION OF THE HEAT EXCHANGERS OF THE WINSCALE ADVANCED GAS-COOLED REACTOR. THIS WILL DEMONSTRATE THAT SUCH PLANT CAN BE DECONTAMINATED AND DISMANTLED FOR DISPOSAL WITHOUT ENVIRONMENTAL HAZARD AND WITHOUT EXCEEDING THE PRESCRIBED RADIATION DOSE LIMITS TO OPERATIVES. THE FINAL PURPOSE OF DECONTAMINATION IS TO ENABLE HANDS-ON METHODS OF DISMANTLING TO BE USED AND AVOID EXPENSIVE AND TIME-CONSUMING REMOTE OPERATIONS. A FURTHER OBJECTIVE IS TO ESTABLISH THE NATURE OF CORROSION AND CONTAMINATION WITHIN THE HEAT EXCHANGER GAS-SIDE IN ORDER TO PROVIDE DATA FOR FUTURE DECOMMISSIONING OF SIMILAR PLANT.
BY REMOVING A LIMITED NUMBER OF SAMPLES, HAVING REGARD TO THE DOSES INCURRED BY THE OPERATIVES, IT IS EXPECTED TO BE ABLE TO IDENTIFY THE CONTAMINANTS AND RECOMMEND METHODS OF REMOVAL. THE LARGE-SCALE WORK WILL BE LIMITED TO THE IN-SITU DECONTAMINATION OF A SUPERHEATER BY SPRAYING OF A RECIRCULATED MIXTURE OF NITRIC AND CITRIC ACID WITH SUBSEQUENT TREATMENT OF THE ARISING SECONDARY WASTE. THIS PILOT EXPERIMENT SHOULD DEMONSTRATE THE EFFECTIVENESS OF THE DECONTAMINATION PROCEDURE AND ITS APPROPRIATENESS FOR AN APPLICATION TO THE FULL-SCALE PROJECT. A COMPLETE COSTING AND DOSE INVENTORY WILL BE MAINTAINED AS THE OPERATIONS PROCEED.
OTHER ORGANISATIONS INVOLVED IN THE FULFILMENT OF THIS CONTRACT ARE: UKAEA WINFRITH (CHARACTERISATION OF CONTAMINATION AND SELECTION OF DECONTAMINATION METHOD), BNFL SELLAFIELD (PROVISION OF ROAD AND RAIL TRANSPORT, WASTE DISPOSAL), NEI-IRD (DESIGNING, MANUFACTURING AND OPERATION OF THE DECONTAMINATION PLANT).
IN A SUPPLEMENTARY AGREEMENT CONCLUDED IN 1988, THE WORK PROGRAMME HAS BEEN REDUCED FOR TECHNICAL REASONS TO THE PRESENT VERSION.
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 advanced gas cooled reactor (WAGR) heat exchangers, and the testing of a selected method on an in situ superheater. The research involved characterisation of tube corrosion and radioactive 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 procedure. It is concluded that the research was successful in developing and demonstrating an effective method of decontaminating large heatexchangers in nuclear power plant.
B.1. CHARACTERISATION OF SURFACE CORROSION AND CONTAMINATION ON EXTRACTED SAMPLES OF THE HEAT EXCHANGERS, AND SELECTION OF AN EFFECTIVE CONTAMINANT ALLOWING FOR AN ACCEPTABLE DISPOSAL OF THE SECONDARY WASTE.
B.2. DESIGN, MANUFACTURE AND INSTALLATION OF A PILOT DECONTAMINATION PLANT.
B.3. DECONTAMINATION OF A SUPERHEATER AND TREATMENT OF THE SECONDARY WASTE.
Dziedzina nauki (EuroSciVoc)
Klasyfikacja projektów w serwisie CORDIS opiera się na wielojęzycznej taksonomii EuroSciVoc, obejmującej wszystkie dziedziny nauki, w oparciu o półautomatyczny proces bazujący na technikach przetwarzania języka naturalnego.
Klasyfikacja projektów w serwisie CORDIS opiera się na wielojęzycznej taksonomii EuroSciVoc, obejmującej wszystkie dziedziny nauki, w oparciu o półautomatyczny proces bazujący na technikach przetwarzania języka naturalnego.
- inżynieria i technologiainżynieria śodowiskagospodarka odpadami
- inżynieria i technologiainne gałęzie inżynierii i technikiinżynieria jądrowa
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