کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10645324 | 999970 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydride phase dissolution enthalpy in neutron irradiated Zircaloy-4
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The differential calorimetric technique has been applied to measure the dissolution enthalpy, ÎHδâαirrad, of zirconium hydrides precipitated in structural components removed from the Argentine Atucha 1 PHWR nuclear power plant after 10.3 EFPY. An average value of ÎHδâαirrad=5 kJ/mol H was obtained after the first calorimetric run. That value is seven times lower than the value of ÎHδâα = 37.7 kJ/mol H recently determined in Zircaloy-4 specimens taken from similar unirradiated structural components using the same calorimetric technique [P. VizcaıÌno, PhD thesis, Number TD-11/03, Inst. Tech. 'Prof. Jorge A. Sábato', CICAC, CNEA, Buenos Aires, Argentina, 24 June 2003]. Post-irradiation thermal treatments gradually increase that low value towards the unirradiated value with increasing annealing temperature similar to that observed for TSSdirrad [P. VizcaıÌno, A.D. Banchik, J.P. Abriata. J. Nucl. Mater. 304/2-3 (2002) 96-106]. Therefore the same H atom trapping mechanism during reactor operation already proposed to explain the evolution of TSSdirrad is also valid for Qδâαirrad. As the ratio Q/ÎH is proportional to the number NH of H atoms precipitated as hydrides, the increment of Qδâαirrad with the thermal treatment indicates that the value of NH also grows with the annealing reaching the value corresponding to the bulk H concentration when ÎHδâαirradâ37 kJ/mol H. That is a direct indication that the post-irradiation thermal treatment releases the H atoms from their traps increasing the number of H atoms available to precipitate at the end of each calorimetric run and/or isothermal treatment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 336, Issue 1, 1 January 2005, Pages 54-64
Journal: Journal of Nuclear Materials - Volume 336, Issue 1, 1 January 2005, Pages 54-64
نویسندگان
P. VizcaıÌno, A.D. Banchik, J.P. Abriata,