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Materials Reliability Program Resistance to Primary Water Stress Corrosion Cracking of Alloys 690, 52, and 152 in Pressurized Water Reactors (MRP-111)
Over the last thirty years, stress corrosion cracking in PWR primary water (PWSCC) has been observed in numerous Alloy 600 component items and associated welds, sometimes after relatively long incubation times. Repairs and replacements have generally utilized wrought Alloy 690 material and its compatible weld metals (Alloy 152 and Alloy 52), which have been shown to be very highly resistant to PWSCC in laboratory experiments and have been free from cracking in operating reactors over periods already up to nearly 15 years. It is nevertheless prudent for the PWR industry to attempt to quantify the longevity of these materials with respect to aging degradation by corrosion in order to provide a sound technical basis for the development of future inspection requirements for repaired or replaced component items. This document first reviews numerous laboratory tests, conducted over the last two decades, that were performed with wrought Alloy 690 and Alloy 52 or Alloy 152 weld materials under various test conditions pertinent to corrosion resistance in PWR environments. The main focus of the present review is on PWSCC, but secondary-side conditions are also briefly considered
Social Mobility in the UK's Higher Education Sector: A Critical Review
Social mobility is at the forefront of the British Government’s plans to improve the lives of the most deprived groups in society. Since the election of the New Labour government in May 1997, consecutive governments, have championed the concept of social mobility. The fundamental aim of social mobility is to tackle social barriers for disadvantaged groups in education and employment. However, within the social sciences there has been a lack of critical discussion regarding the theorisation of social mobility within the context of higher education (HE). In recent times higher education research has instead had a greater focus on pedagogy. The aim of this review is to critically explore past and current debates on social mobility, and the importance the concept has in the higher education sector. In this paper special reference will be made to the new UK government higher education policy on the Teaching Excellence Framework (TEF)