DRYING OF MOCK SPENT NUCLEAR-FUEL ELEMENTS

Spent nuclear fuel elements are stored in underwater cooling pools unt il the elements can be safely handled and prepared for interim dry sto rage. The fuel was intended for short-term storage in water before it was to be reprocessed. However, the fuel will no longer be reprocessed , and extended storage in water has caused many of the aluminum-clad e lements to degrade, exposing the uranium fuel. In addition, sludge, co mprised of corroded aluminum and sediment, has accumulated in and arou nd the fuel plates. The water in the sludge must be removed before the spent fuel elements can be placed in dry storage. Experiments have be en performed on mock spent fuel elements with simulated corrosion prod uct applied between the plates. A series of vacuum and heating cycles were used to dry the elements, and a mixture of clay and aluminum oxid e was used to simulate corrosion products on the elements. The procedu res used in the experiments were determined to be adequate to dry the mock spent fuel elements, and the temperature behavior of the simulate d corrosion product within the fuel elements could be used to determin e when the element was dry. On plates where areas of wet simulant were found, a sharp drying front was observed that separated the wet and d ry parts of the simulated corrosion product. The drying front propagat ed inward towards the center of the mock fuel elements over time.