Postirradiation Examination, Analysis of Performance of HFIR

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Multidisciplinary Methods for Analysis Optimization and Control of Complex Systems

This ebook contains lecture notes of a summer season institution named after the past due Jacques Louis Lions. The summer season university used to be designed to alert either Academia and to the expanding position of multidisciplinary tools and instruments for the layout of advanced items in numerous parts of socio-economic curiosity.

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14. Comparison Between Oxidk Spalling P a t t e r n s on Fuel P l a t e s from Element 5-0 with t h e Predicted Oxide Thickness P a t t e r n f o r an Outer Annulus HFIR Fuel P l a t e . ~ ~ 28 Fig. 15. Typical Appearance of Fuel P l a t e s from HFIR Fuel Element 21-0. The dark, p a r a l l e l l i n e s on t h e convex surfaces of t h e s e f u e l p l a t e s a r e r u s t s t a i n s from s e c t i o n s of a s t e e l t a p e used a s p o s i t i o n i n d i c a t o r s during disassembly of t h i s f u e l element and not an i r r a d i a t i o n e f f e c t .

003 i n . deep). Although not r e a d i l y apparent a t lower magnifications shown i n Appendix E, the microstructure of the U308-aluminum fuel dispersion v a r i e d considerably along and across eLch of t h e t h r e e i r r a d i a t e d f u e l plates. These d i f f e r e n c e s a r e perhapsimore c l e a r l y shown i n Fig. 31, I which compares t h e m i c r o s t r u c t u r e of t h e f u e l d i s p e r s i o n of an u n i r r a d i a t e d HFIR f u e l p l a t e w i t h t h a t from khe low-burnup, low-temperature and high-burnup, high-temperature regions.

Such hardness i n c r e a s e s a r e probably p r i m a r i l y a r e s u l t of fast neutron displacement-type damage. These hardness i n c r e a s e s a r e probably 12W. K. Barney and B. D. Wemple, Metallography of I r r a d i a t e d U02Containing Fuel Elements, KAPL-1836 (June 1 9 5 6 ) . 70 . 80 - I 'SPECIMEN BURNUP (x4o20)] [fissions/cm3 I 60 NOMINAL CLADDING IRRADIATION TEMPERATURE 1°C) E f f e c t of I r a a d i a t i o n Temperature upon t h e Extent o:t"Reaction i n t'rle Cores o f t h e Inner (Top) and Outer (Bottom) Annulus H F I R Fuel P l a t e s .

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