Decontamination and Decommissioning of Nuclear Facilities

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Extra resources for Decontamination and Decommissioning of Nuclear Facilities (IAEA TECDOC-716)

Sample text

Necessary data and experiences will be gained with the decontamination experiments. The purpose of the experiments are to demonstrate the feasibility of those devices developed, and to provide designing base for practical devices. 2. Device Description 2. 1) Electrolyzer.... 500 X 500 X 700 mm Oblique plane clarifier.... 500 X 500 X 700 mm Length of oblique plane.... 400 mm Gap between the oblique planes.... 25 mm Oblique angle.... 60° DC supply unit.... 200 A/0 - 24 V Ventilation casing.... 2 Internal Surface Electrodecontamination Device This device is comprised of rotation anodic cathode (to be treated).

It is 500 mm of length. On the internal surface of the anode, there are three annular notch, used for installation and fixation the testing samples. The testing samples could be carbon steel or stainless steel. 2 Movable Cathode Cathode was made of brass. On the side surface of the front end, 120 holes with diameter 1 mm were distributed homogeneously. Electrolyte sprayed through them onto the internal surface of pipe. On the front and back of cathode, one and tow Fig. 3 Anode structure diagram 35 guide means were fixed, to keep the correct position of cathode and spray direction of electrolyte, also to keep from direct touching of cathode and anode.

Afterwards, the fuel loading scheme was changed from the original Out-In-In scheme to a (very) low-leakage scheme. The effects of these two changes on the activation of the reactor components and structures in the radial direction were studied, too. 2. Activity inventory calculations Radioactive inventory calculations were performed with the ORIGEN-S code of the SCALE-3 program package with its own data libraries [15,16]. The LWR data libraries with the three-group cross sections are intended for calculations in or near the reactor core.

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