DISCLAIMERPortions of this document may be illegible in electronic image products. Images are produced from the best available original document. LEGAL N O T I C EThb report wm pnpwd u .p wrmm d G a w r~~n t apmwd rmrk. Naithar the United h t a , r r o r t h *~, n a r~y~~~n b c d u S f d t b~' . :A. MJa any wuranw a mpasentuimt, equms ur hpJied, with m q e e to tbe acmmcy, J. H. McFaddenThla report am@ prewred aa a n accwnt of Oorsrnment sponsored wrk. Ncllher Uo Unlted Smtea. nor lhe Mmmlaalon. nor MY per-a s U v oa beball of h c~ommlsalon:A. M&ca any s n r r~t y or rePreaenlUon.cxpreaacd or Implled. W I respect u, the secu- I D A H O N U C L E A R C O R P O R A T I O N A J o i n t l y Owned S u b s i d i a r y o f AEROlET GENERAL CORPORATlON A L L I E D CHEMICAL CORPORATION P H I L L I P S PETROLEUM COMPANY ABSTRACTAn a n a l y t i c a l function has been developed f o r c o r r e l a t i n g f i s s i o n gas capsule r e l e a s e data. This function, derived through a thermodynamic approach employing Gibbs-free-energy r e l a t i o n s h i p s , provldes an e x c e l l e n t c o r r e l a t i o n of t h e capsule r e l e a s e d a t a f o r f u e l elements during r e a c t o r operation. The thermodynamic approach demonstrates t h a t the o u t e r regions of the U Q f u e l c o n t r o l f i s s i o n gas r e l e a s e from a f u e l p i n during operation and t h a t a l a r g e temperaturc gradient r e t a r d s t h e escape of f i s s i o n gases. The a n a l y t i c a l function derived p r e d i c t s r e s u l t s which a r e contrary' t o most of t h e c u r r e n t l y published models, however, it i s n o t e n t i r e l y unique a s i s discussed. The equation f o r t h e l e a s t squares f i t of t h e function and t h e operating d a t a f o r a f u e l pin may be used t o c a l c u l a t e the r e l e a s e f r a c t i o n t o w i t h i n a f a c t o r of two of t h e observed r e l e a s e f r a c t i o n . The function a l s o c o r r e c t l y p r e d i c t s t h e r e l a t i o n between t h e decay constant, hi, and t h e r e l e a s e f r a c t i o n , F i .

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