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NRC looks to leverage previous approvals for large LWRs
During this time of resurging interest in nuclear power, many conversations have centered on one fundamental problem: Electricity is needed now, but nuclear projects (in recent decades) have taken many years to get permitted and built.
In the past few years, a bevy of new strategies have been pursued to fix this problem. Workforce programs that seek to laterally transition skilled people from other industries, plans to reuse the transmission infrastructure at shuttered coal sites, efforts to restart plants like Palisades or Duane Arnold, new reactor designs that build on the legacy of research done in the early days of atomic power—all of these plans share a common throughline: leveraging work already done instead of starting over from square one to get new plants designed and built.
Sang Ge, Luo Xuejian, Liang HongWei, Sun Ying, Wu Sheng, Su Yongjun, Tu Mingjing, Luo Wenhua
Fusion Science and Technology | Volume 41 | Number 3 | May 2002 | Pages 758-763
Hydride and Storage | Proceedings of the Sixth International Conference on Tritium Science and Technology Tsukuba, Japan November 12-16, 2001 | doi.org/10.13182/FST02-A22688
Articles are hosted by Taylor and Francis Online.
In this paper, studies have been made concerning the poisoning mechanism. The processes of poisoning of LaNi47Al0.3 alloy are analyzed in detail by means of X-ray photoelectron spectroscopy (XPS), second ion mass spectroscopy (SIMS), Auger-energy spectroscopy (AES) and X-ray diffraction (XRD). The changes of the valence and the concentration distribution of the elements of the alloy LaNi4.7Al0.3 poisoned by CO are studied. The process and the mechanism of CO's poisoning of alloy LaNi47Al0.3 are proposed as follows: CO is absorbed on the surface of alloy, part of which reacts with La forming LaC2 and La2O3, or reacts with Ni forming NiO and C in the surface layer, the rest of the CO is decomposed into C and O, which diffuse into the bulk to react with La, Ni and Al. These results in phase-split reaction in surface layer of the particle, and enrichment of La and impoverishment Ni on the surface have taken place. The poisoning effect decreases with a increase of depth. The diffusion depth of C is within 600 Å in the surface layer, and that of O is within 1000 Å.The oxide film and carbonizing film prevent the H-storage alloys from further absorbing hydrogen, which leads to a deceleration of the H-storage capability. Moreover, The formation of a new phase with poor H-absorption capability is caused by the phase split reactions, which is one of reasons for the decrease of H-absorption property of the H-storage alloys.
