Download Advances in Nuclear Science and Technology: Volume 16 by Hamish MacKinnon Banford (auth.), Jeffery Lewins, Martin PDF

By Hamish MacKinnon Banford (auth.), Jeffery Lewins, Martin Becker (eds.)

John Maynard Keynes is credited with the aphorism that the long term view in economics needs to be taken within the mild that "in the long term we're aU dead". it's not in any spirit of gloom despite the fact that that we invite our readers of the 16th quantity within the evaluate sequence, Advances in Nuclear technology and know-how, to take a protracted view. the 2 valuable roles of nuclear power lie within the army sphere - now not addressed as such during this serie- within the sphere of the centralised construction of energy, and mainly electrical energy new release. The rapid want for this latter has receded within the present period of limited economies, vanishing progress charges and low surpluses of oil immediate markets of the realm. Nuclear strength has its most crucial position as an assurance opposed to the challenging instances to return. yet will the call for come at a time whilst the present reactors with their heavy use of usual uranium feed shares are for use or in an period the place different facets of the gasoline offer needs to be exploited? The time scale is adequately doubtful and the length of the call for so unascertainable brilliant ahead coverage needs to expect that by the point the main call for comes, the kind of to be had usual uranium could have been principally ate up within the terrible convertors of the present thermal fission programme.

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This result is in broad agreement with the observations of Van de Voorde (96) that as far as mechanical properties are concerned radiation tolerance increases at cryogenic temperatures provided there is no substantial warm-up. Polymers may behave differently electrically if both irradiated and maintained at liquid helium temperature, and it is not at all certain that the poor dielectric performance that Coltman, Jr. et al (103) found with G-I0 CR and G-ll CR, for example (TABLE IV) , would be improved as would the mechanical properties.

The G-I0 and G-ll CR epoxies which comprise a bisphenol system were considerably affected at 10 8 Gy. Resistivity fell by an order of magnitude and the breakdown strengths were more than halved. Mechanical tests were in the main those of flexure and compression. Epoxy strength results are given in Figures 29 and 30 respectively (103), and comparison shows that the response of a material to radiation differs with the type of mechanical test employed. This suggests that choice of material may depend on stress conditions to be experienced in service.

This suggests that choice of material may depend on stress conditions to be experienced in service. 4 x 10 7 Gy (Figure 29) the resin/glass fibre composites (G-I0 CR, G-IOCR-BF, G-I1CR) showed a marked reduction in strength but were still competitive with the strength of the particlefilled epoxies at that dose (Stycast 2850FT, Epon 828). At 10 8 Gy the flexure strength of the particle-filled epoxies was at the end of life whereas the glass-filled epoxies still had some usable strength. This is not the case with compression, where Epon 838 showed greatest strength of all the epoxy systems at 10 8 Gy.

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