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WIPP improves utility shaft safety, begins infrastructure project
Harrison Western Shaft Sinkers (HWSS), the company drilling a new utility shaft at the Department of Energy’s Waste Isolation Pilot Plant in New Mexico, has retained a safety culture expert following a near-miss accident in the shaft late last year. The safety expert will conduct monthly facilitated discussions with crews working on the shaft to reinforce expectations for identifying concerns regarding unsafe circumstances, according to a recent report by the Defense Nuclear Facilities Safety Board (DNFSB).
B. Pégourié, A. Géraud, Tore Supra Team
Fusion Science and Technology | Volume 56 | Number 3 | October 2009 | Pages 1318-1333
Technical Papers | Tore Supra Special Issue | doi.org/10.13182/FST09-A9180
Articles are hosted by Taylor and Francis Online.
Particle control is an essential requirement for long-pulse operation. Besides steady-state particle exhaust, the complementary key element is particle fueling. Three fueling methods are currently used in Tore Supra: conventional gas puffing, supersonic molecular beam injection, and pellet injection. In addition to a technical description of the corresponding systems, this paper presents an overview of different studies characterizing these methods in terms of fueling efficiency and ability to fuel long discharges or to obtain high-density plasmas with no confinement degradation. An analysis of the interaction between the plasma and the pellet or supersonic beam is also given, including the physics of the homogenization of the deposited particles in the background plasma (importance of the edge cooling and of the [nabla]B-induced displacement) or the transport-induced modification for deep-matter penetration (triggering of an improved confinement phase or, conversely, of a sawtooth crash when a pellet crosses the q = 1 surface).