Evaluation of hastelloy N alloys after nine years exposure to both a ...

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Fig. 38. Weight loss of type 304L stainless steel specimens as a function of operation time at various temperatures in Lip-23 mole % BeFz-5 mole % ZrF4-l mole % ThF4-1 mole % Up4 salt. w h)
a 1 33 Fig. 39. Microstructure of type 304L stainless steel specimen in loop 1259, exposed to fuel salt for 5700 hr at 688°C. \ Y 0 i;: 600 - 550 0 20 40 60 DISTANCE AROUND LOOP (in.) ORNL-DWG 72- If22 Fig. 40. Temperature profie and mass transfer schematic. as those discussed previously are noted. Positions (temperatures) above the zero line wiU probably lose material, while those below wil gain material. A simple calculation based on the increase of 1700 ppm chromium in the salt during operation gives us some insight on the amount of material removed. The amount of material that would have to be removed to equal the number of grams of chromium found in the salt was 2.2 mils of Hastelloy N over one-half the length of the loop. It is assumed that half the loop gained material while half lost material. Thus, the average depth of complete chromium depletion in the hot leg would be 2.2 mils. Based on past experience 80 .
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