By W. P. Worden (auth.), Marilyn M. Osterhout (eds.)
This quantity includes the invited and contributed papers pre sented on the American Nuclear Society (ANS) assembly on Decontamina tion and Decommissioning (D & D) of Nuclear amenities, held Septem ber 16-20, 1979, in solar Valley, Idaho. This used to be the 1st U. S. assembly of the ANS which addressed either one of those vital and similar topics. The assembly was once attended via greater than four hundred engineers, scientists, laymen, and representatives of federal, country, and native governments, together with contributors from 11 overseas nations. The technical classes incorporated numerous classes focusing on ongoing D & D courses within the U. S. and overseas. moreover, "new floor" was once damaged in such parts as decommissioning expenditures and price restoration, complex courses on reactor coolant filtration, and different parts of constant and extending value to the nuclear and to shoppers. the twin sponsorship of the assembly (The ANS Reactor Operations department and the japanese Idaho component of the ANS) helped spur a top quality software, a delightful situation, and a excessive measure of suc cess in technical interchange among the attendees. As visitor speaker, we have been venerated to have Mr. Vince Boyer of Philadelphia electrical corporation. Mr. Boyer is either a earlier chairman of the ANS Reactor Operations department and a previous president of the yankee Nuclear Society. His perspectives at the nuclear and of its present prestige have been informative and interesting.
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Extra info for Decontamination and Decommissioning of Nuclear Facilities
DECONTAMINATION OF REMOVABLE REACTOR COMPONENTS Ten effective decontamination techniques have been identified by the survey participants for use on reactor components. The decontamination techniques identified were: Acid Bath Electrocleaning Grit Blasting Hand Scrubbing J. F. REMARK AND A. D. MILLER 38 High Concentration Chemicals Hydrolasers Steam Cleaning Strippable Coatings Turbulators Ultrasonics The techniques that are employed most often for removable reactor components are high concentration chemicals, hydrolasers, and ultrasonics.
In all cases the decontamination was successful with most reported decontamination factors being greater than 10. Other nuclear sites are planning for reactor cooling system decontamination. Dresden 1 appears to be the next site scheduled for reactor coolant system decontamination. This is currently scheduled for fall of 1979. Dresden 1 personnel will employ the REVIEW OF PLANT DECONTAMINATION METHODS 43 Dow NS-1 reagent for this decontamination. The NS-1 solution and rinse will be processed through a forced circulation evaporator and the bottoms will be solidified with the Dow system.
Some site personnel have designed their own ultrasonic units. Oyster Creek and San Onofre operators have employed ultrasonics to decontaminate a control rod drive mechanism. Oyster Creek technicians employed no chemical assist while San Onofre technicians employed a citric acid solution. San Onofre personnel reported a decontamination factor of 30. No decontamination factor was reported by Oyster Creek personnel. Other components that have been successfully decontaminated employing ultrasonics are pump seals, small valves, pump casings, reactor coolant pump coolers, and seal injection filters.