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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).
Sümer Şahin, Ali Erişen, Yalçin Çebi
Fusion Science and Technology | Volume 15 | Number 1 | January 1989 | Pages 37-48
Technical Paper | Blanket Engineering | doi.org/10.13182/FST89-A25322
Articles are hosted by Taylor and Francis Online.
A straightforward numerical graphical method is applied to achieve a flat fission power density (FPD) in a hybrid blanket by using a mixed fuel (ThO2 and natural UO2) with variable fractions of the fuel components in the radial direction. The neutronic analysis is carried out on a blanket with a hard neutron spectrum in the fissionable zone by simply omitting the moderating beryllium neutron multiplier. Mainly due to this precaution in the blanket design, the FPD could be kept quasi-constant over a relatively long plant lifetime. The peak-to-average FPD increased from 1.0704 at startup to only 1.1056 after an operation period of 24 months by a plant factor of 60% under a first-wall fusion neutron flux load of 1014 to 14 MeV·-n/cm2·s, corresponding to ∼2.25 MW/m2. Consequently, a hybrid blanket of the type used in this study would not require any fuel management scheme for at least 2 yr of plant operation.