Soil contamination by irrigation and capillary rise of groundwater
Author | : M. I. Sheppard |
Publisher | : |
Total Pages | : 0 |
Release | : 1987 |
ISBN-10 | : OCLC:1411919833 |
ISBN-13 | : |
Rating | : 4/5 (33 Downloads) |
Book excerpt: Chromium plating the rolled joint region of end fittings of candu fuel channels is being considered as a way to minimize deuterium ingress into the zr-2.5nb pressure tubes. the effect of the cr-plating on activity transport and decontamination in a candu primary heat transport system (phts) was evaluated. when unplated 403 ss and carbon steel were used to simulate endfitting and feeder pipe material downstream of the cr plating, no increase in co-60 buildup was measured on these materials. the cr plating was dissolved under oxidizing phts conditions which may be found at the outlet of some fuel channels. even with the dissolution of the cr plating under oxidizing conditions, the contribution of cr-51 to radiation fields is predicted to be small, and of limited duration. the integrity of the chromium plating was not affected by the alkaline permanganate (ap) oxidizing process and can-decon decontamination reagent, provided that reducing phts conditions were maintained during operation. the can-decon reagent was not effective in decontaminating cr-plated components that had been exposed only to reducing phts conditions. however, the ap and ap/can-decon processes were effective in removing activity from the cr-plated surfaces and did not affect the integrity of the plating. chromium plated surfaces that have been exposed to oxidizing conditions can be decontaminated using the can-decon reagent; however, only two-thirds of the activity will be removed from the unplated and cr-plated 403 surfaces. cr plating partly removed by oxidizing phts conditions can be removed by ap, but in a reactor this plating would most likely be fully dissolved during operation before decontamination.