By H. Matzke and G. Schumacher (Eds.)
This quantity brings jointly forty seven papers from scientists fascinated by the fabrication of recent nuclear fuels, in uncomplicated study of nuclear fabrics, their program and know-how in addition to in machine codes and modelling of gas behaviour. the most emphasis is on growth within the improvement of non-oxide fuels in addition to reporting advances within the extra traditional oxide fuels. the 2 at the moment played huge reactor protection programmes CORA and PHEBUS-FP are defined in invited lectures. The contributions evaluation simple estate measurements, in addition to the current country of gasoline functionality modelling. The functionality of modern day nuclear gas, consequently UO2, at excessive burnup is usually reviewed with specific emphasis at the lately saw phenomenon of grain subdivision within the chilly a part of the oxide gasoline at excessive burnup, the so-called ''rim'' impression. comparable phenomena should be simulated by way of ion implantation so that it will higher elucidate the underlying mechanism and stories on excessive solution electron microscopy supply extra info
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Extra info for Nuclear Materials for Fission Reactors
F) synthesis c o m p a r e d to t h e value of t h e U N formation can b e explained by t h e higher ionic character of P u N which e n h a n c e s probably t h e transformation of P u 0 2 j n P u N . T h e variations of t h e o t h e r kinetics coefficients (lower frequency factor Ζ a n d lower proportionality flow rate constant) a r e significant with t h e predomia nnt effect of t h e U - P u diffusion over t h e anionic exchanges, For t h e synthesis of (U,Pu)N, there is n o data available in t h e known literature in o r d e r to propose an A r r h e n i u s equation; nevertheless, there is an exist3 1 ing value of t h e rate constant k,k = 3 .
5 6 o %) t ·„ ^ r e a c dn o g as h as „ b e e d e a r y] d e t e r m jd n e upon the completion of the conversion. W h e n the N 2 + H 2 gas is used only at the end of the main reaction u n d e r N 2 , a second C O peak is detected just after the gas shift N 2 -> N 2 + H 2 as seen on fig. 2. F u r t h e r m o r e , this C O extra release corresponds to the quantitative decreases of the C and Ο residual concentrations in the synthesized nitride. 1 m o l % , further research has been conducted with a more sensitive mass spectrometer in order to elucidate the mechanism of the rapid C O release when N 2 + H 2 is used.
Profilometry Déformation width (μπι) I I 600 I 1 1 800 • Distance from Top of Pin [ mm ] Fig. 1. Carbide pin C-15, KNK-NY-708, profilometry (max/min). 1 1000 45 D. Geithoffet al. / Irradiation of a 19 pin subassembly in KNK II o 4. / ν \J Ν o I 1 5 0 k , / ^ V ^ e ^ i A wv^a/ W y I 200 I 400 I After 0 , A/\ M V ^ ^ W u ^ ^ Α V™^ λ il /τ V ^ ^ ^ y I ^ I 1 d e c a y time of about three years in the storage pool of the K N K the subassembly was transported to the hot cells at KfK for dismantling and examination of the pins.