Fuels (nuclear) Development Operations [Jul-Sep 1959]

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Extra resources for Fuels (nuclear) Development Operations [Jul-Sep 1959] [Declassified]

Example text

Hales The effects of reactor irradiation on the microstructure and properties of zirconium alloys are being evaluated by studies of high resolution metallography, X-ray diffraction, hardness, optical microscopy, and damage annealing kinetics. The materials include zirconium, Zircaloy-2, and Zircaloy-3 in each of the following conditions: annealed, beta-quenched, and cold worked to 10, 25, and 50 per cent. Five Specimens of Zircaloy-2, one representing each of the fabrication conditions, have been irradiated at 220 C to a total integrated neutron flux of 9 x 1019 nvt (thermal).

6 x- < o. jo. 4 =E'r" ::) I-¢0-- AS IRRADIATED o-AFTER I00 AT ""300°C, HR. / I I1. 29 Pore Density, (2 2+ "'_r)A _ 0. 50 0. 31 0. 41 a/o Pores/_ 3 1 The calculated void fraction increase due to annealing at 880 C compares quite satisfactorily with the per cent change in macroscopic density, indicated in Table 3; 10. From the data in Table 3. 11 it would appear that (1) every little swelling (increase in void fraction) occurs during irradiation at temperatures below 500 C in restrained specimens; (2)there is no significant difference in either pore size or distribution for the two irradiation temperatures; (3) post-irradiation annealing causes a slight decrease in the number of observable pores per unit volume in uranium irradiated at low temperatures, approximately 300 C_ and causes an increase in the number of pores formed in uranium irradiated at high temperatures, approximately 500 C.

__l jChang e Anneal Zirconium (150 C) % ..... 12 6. 7 x 1018 7. 62 7. 44 7. 5 x 1020 7. 64 7. 080. 14 7. 042 If. 80 1. 19 * Me_n of twelve readings. 25 i HW-62656 TABLE MICROHARDNESS 3;8 OF IRRADIATED ZIRCONIUM ,i 1,,i AND MOLYBDENUM , (1 kg LOAD Specimen Exposure .............. (nvt fast) StatisticAs-Irrad. 0 Z-85 Z-43 4. ' Si_, 3) Anneai(4. 3 2nd Annea_(5). 2 ID M-7 0 X S2 M-48 M-19 4. 8 239. 6 NS 14. 1 Mean of six hardness values. Variance. 05. (S = significant, NS = not significant). One hour at 150 C for zirconium, and at 125 C for molybdenum.

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