Mercury-free dissolution of aluminum-based nuclear material: from basic science to the plant

• Autorzy: Crooks III W. , Crown J. , Dunn K. , Mickalonis J. , Murray A. , Navratil J.
• Języki publikacji: EN

Abstrakty

EN

Conditions were optimized for the first plant-scale dissolution of an aluminum-containing nuclear material without using mercury as a catalyst. This nuclear material was a homogeneous mixture of plutonium oxide and aluminum metal that had been compounded for use as the core matrix in Mark 42 nuclear fuel. B ecause this material had later failed plutonium distribution specifications, it was rejected for use in the fabrication of Mark 42 fuel tubes, and was stored at the Savannah River Site (SRS) awaiting disposition. This powder-like material was composed of a mixture of ~80% aluminum and 11% plutonium. Historically, aluminum-clad spent nuclear fuels have been dissolved using a mercuric nitrate catalyst in a nitric acid (HNO3) solution to facilitate the dissolution of the bulk aluminum cladding. Developmental work at SRS indicated that the plutonium oxide/aluminum compounded matrix could be dissolved using boric acid-hydrofluoric acid-nitric acid as a substitute for mercury. Various mercury-free conditions were studied to evaluate the rate of dissolution of the Mark 42 compact material and to assess the corrosion rate to the stainless steel dissolver. The elimination of mercury from the dissolution process fit with waste minimization and industrial hygiene goals to reduce the use of mercury in the United States. The mercury-free dissolution technology was optimized for Mark 42 compact material in laboratory-scale tests, and successfully implemented at the plant.

Słowa kluczowe

EN

aluminum dissolution; plutonium oxide dissolution; stainless steel corrosion; mercury-free

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2003
• Tom: Vol. 48, nr 4
• Strony: 163--169
• Opis fizyczny: Bibliogr. 16 poz., rys.

Twórcy

autor

Crooks III W.

• Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, SC, USA, 29808, Tel.: [phone], Fax: [phone]

autor

Crown J.

• Environmental Engineering and Science, Clemson University, 342 Computer Court, Anderson, SC, USA, 29625-6510

autor

Dunn K.

• Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, SC, USA, 29808, Tel.: [phone], Fax: [phone]

autor

Mickalonis J.

• Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, SC, USA, 29808, Tel.: [phone], Fax: [phone]

autor

Murray A.

• Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, SC, USA, 29808, Tel.: [phone], Fax: [phone]

autor

Navratil J.

• Environmental Engineering and Science, Clemson University, 342 Computer Court, Anderson, SC, USA, 29625-6510

Bibliografia

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• 3. Cobb CL (1989) Eliminating mercury from the waste stream. Report no. WSRC-RP-89-1232. Westinghouse Savannah River Co., Aiken, SC
• 4. Crooks WJ III (2000) Validation of flow sheet for dissolution and downstream processing of Mark 42 compacts and sweepings. Report no. WSRC-TR-2000-00181, rev. 0. Westinghouse Savannah River Co., Aiken, SC
• 5. Crooks WJ III, Murray AM, Gray JH, Westover PA (1999) Formation of potassium tetrafluoroborate in SRS canyon dissolver. In: Proc of the 23rd Annual Actinide Separations Conf, June 7−13, 1999, Kennewick, Washington, USA, p 30
• 6. Dunn KA, Mickalonis JI (1999) Experimental study to evaluate corrosion of the F-canyon dissolver during the unirradiated Mark-42 campaign. Report no. WSRC-TR-99-00261. Westinghouse Savannah River Co., Aiken, SC
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