[Article] A Statistical Method for Studying the Radiations by Kovarik A.F.

By Kovarik A.F.

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Loose contamination was removed using HEPA filtered vacuum cleaners and damp swabbing with decontamination reagents. Sprayed on peelable coatings were also used to both temporarily fix the contamination and to remove it with the coating. It was found that care had to be taken with the application of the peelable coatings as they are difficult to remove from pitted surfaces such as bare concrete. A number of high radiation fixed contamination spots were found, these were dealt with by more vigorous mechanical techniques.

The result was a collection of concrete blocks of between 40 and 2 tonnes in weight, the total weight being approximately 350 tonnes. 3. DECONTAMINATION FOR FREE RELEASE The challenge was to complete the decontamination of the concrete blocks to achieve free release of the concrete and to minimise the volume of low level waste. A number of abrasive techniques and equipment were used to remove contamination from all surfaces of each block. Containment tents, fitted with HEPA filtered extract, were erected within the Active Handling Building in which to undertake the decontamination.

Improve remote maintenance features such as guides for replacement components, captive fasteners, accessibility for remote handling equipment and lifting features. • Improve equipment visibility using camera systems. • Optimisation of water sprays and water management systems. • Optimisation of remote handling equipment such as manipulators and cranes. The design changes identified as a result of the test programme were fed into the manufacturing programme for the main plant equipment. The manufacturing programme was developed to reflect hold points on certain items of equipment where there was considered to be a high risk that changes were necessary.

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