I Th* report war prepared as am accwnt of Gwernment sponsond work. Neither the United Stam nor the Commission, nor any penan acting on behalf of the C o d o n : A Makes any warranty or representation, ucprev or hplied, with r u p c c~ to thc accuracy, completeness, or us&ulnesr of the information contained in this report, or that the we of any infotmatiun, apparatus, method, or process disclosed in this repprt may not infringe privabdy m a d rights; a I B. Auumca any liibilitirs wl& rmpect to the urn af, et 1~. ~IXIII.BP I C I~~ from the u u of any iefonnation, apparatus, method, or procesa disclo9crd in thir report. As used in the above, "person acting on bchaJf of the C o d d o n a ' indada any employee or mntractor of the Commission, or empibee of such cantnetor, to the extent that such employee or eonSractor of the C o d~s i o n , or employee of such contractor prepares, diweminates, or provides ~E M I to, any information pursuant to hir employmept or contract with the Comduion, or ?iia unphVmedt with such contractor.

No abstract

This repo r t was prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any peu,uu at.:ting on behalf of the Commission: A. Makes any warranty or representation, express or implied, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process disclosed in this report may not infringe privately vw m:J 1 l~l1 l~, Ul B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, "person acting on beha lf of the Commission" includes any employee or contractor of the Commission, or employee of such contractor, to the extent that such employee or contractor of the Commission, or employee of such contractor prepares, disseminates, or provides access to, any information pursuant to his employment or contract with the Commission, or his emp loyment with such contr ac tor.

\The Waste Calcining Facility at the Idaho Chemical Processing Plant of Idaho Nuclear Corporation utilizes a fluidized-ted calciner for converting highly radioactive aqueous waste into granular solids. Heat has been supplied to this calciner by circulating sodium-potassium (NaK) eutectic alloy at 76O°C through a bayonet heat exchanger in the fluid! zed-bed of solids.Service test examinations were performed on the Type 316 stainless steel loop for circulating the NaK' eutectic alloy. These examinations of the stainless steel loop revealed the cumulative effects of 32,600 hours of operation !at temperatures of 590 to 780°C during eight years service. Although Type Ql6 stainless steel performed satisfactorily, the results shoved that changes in mechanical properties and metallurgical effects occur with circulating nonisothermal NaK in contact with Type 316 stainless steel. Some mass transfer of alloying elements from the hot regions.of the Type 316 stainless steel loop to the colder regions was observed. The mitigation of these effects; is discussed. il SUMMARYThe Waste Calcining Facility (WCF) at the Idaho Chemical Processing Plant employs a fluidized bed calcination process for converting highly radioactive aqueous waste into granular solids. Heat was supplied to the calciner by circulating sodium-potassium (NaK) eutectic alloy at 760°c through a bayonet heat exchanger in the fluidized bed of solids. Construction material for ;he NaK loop in the WCF was Type 316 stainless steel; the bayonet heat exchanger is Type 316 stainless steel modified with columbium and tantalum; the semi-eliptical heads on the NaK expansion tanks are Type 318 stainless steel. On March 19, 1969, the loop was shut down in preparation for the installation of an in-fluidizedbed combustion heating system. When shutdown occurred, this loop had been in service for 1,1*07 hours below 600°C and 31,182 hours above 600°C with 52 starts from room temperature.

LEGAT N O T I C EThla r e p r t was prepared as an account of Government sponsored work. Neither the United States, nor the Commission. nor any person acting on behalf of the Commission:A. Makes anywarranty orrepresentatlon. expressed or Implied, with respect to the accuracy. completeness. or usefulness of the information contained in this report, or that the use of any information. apparatus, method, or Process disclosed in this report may not infrlnge privately o w e d righta: or B. Asaumes any liahilities with respect to the use of, or for damages resulting from the use of any information. apparatus. method. or process disclosed in this report.As used in the above. "person actlng on behalf of the Commission" includes my employee or contractor of the Commission. or employee of such contract~r. to the extent ~l a t such employee or contractor of the Commission. or employee of such contractor prepares.disseminates. or provides acce88 to. any informallon p~rauant to hie employment o r contract W i t h the Commi88lon. or his employment with such contractor. IDAHO NUCLEAR A J O I N T L Y O W N E D AEROJET G E N E R A L C O R P O R A T I O N COR PORAT ION S U B S I D I A R Y O F A L L I E D C H E M I C A L C O R P O R A T I O N U. S. Atomic Energy Commission Research and Development Report, Issued Under Contract AT(lO-1)-1230Idaho Operations Office ABSTRACTCorrosion rates for Monel-400 and various stainless steels in process solutions were determined in laboratory studies and in plant service. The plant service period included the first reprocessing of zirconium alloy nuclear fuels using boric acid a s a soluble poison during dissolution, Corrosion rates for a Mone 1-4 00 dissolver us ing hydrofluoric -f luobor ic acid dis solvent and sulfuric and chromic acids for cleanout ranged between two and eight mils per month. Corrosion rates for stainless steel plates containing boron a s a fixed poison in the first cycle product evaporator were very low. The low corrosion rates for this and other process equipment indicate that the system can be used for future reprocessing operations.ii