Laboratory evaluations of mechanical decontamination and descaling techniques

TL;DRAbstract

The objective of this work was to evaluate a number of nonchemical industrial techniques that have potential for use in decontamination of portions of the reactor coolant system at TMI-2. The basis for the evaluation was the performance of the technique in tubing/pipe with respect to: (1) removal of simulated loose fuel debris, (2) removal of a corrosion layer, (3) the condition of the cleaned surface, and (4) cleaning of 90/sup 0/ elbows. Testing of the techniques was accomplished by demonstrations conducted at vendor sites and by laboratory work at Quadrex. Corrosion layers were simulated by using 0.75 in. oxidized Inconel tubing and either painted or oxidized 3 in. type 304 stainless steel pipe. Loose fuel debris was simulated with a 50:50 mixture of one and five micron tungsten powder. The most useful techniques for removal of both loose debris and corrosion layers were a rotating brush-hone tipped with SiC and a rotating, expanding wire brush. Although high/ultrahigh-pressure wate

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