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Khan N.,Nalcor Energy | Smith J.,Schlumberger | Hinchey M.,Memorial University of Newfoundland
Journal of Ocean Technology | Year: 2013

In earlier work, we tested the Savonius rotor as a water current turbine. Here we explore the possibility of studying the behaviour of the rotor using the Computational Fluid Dynamics (CFD) software package FLOW 3D. The paper shows that CFD can predict the basic behaviour of the rotor as seen in the experiment. This result is important because running CFD takes much less time and is much less expensive than running experiments. So we can now use CFD to optimize the geometry and explore strategies for control.

Smokorowski K.E.,Canadian Department of Fisheries and Oceans | Bergeron N.,INRS - Institute National de la Recherche Scientifique | Boisclair D.,University of Montréal | Clarke K.,Environment Canada | And 19 more authors.
Fisheries | Year: 2011

NSERC's HydroNet is a collaborative national fiveyear research program initiated in 2010 involving academic, government, and industry partners. The overarching goal of HydroNet is to improve the understanding of the effects of hydropower operations on aquatic ecosystems, and to provide scientifically defensible and transparent tools to improve the decision-making process associated with hydropower operations. Multiple projects are imbedded under three themes: 1) Ecosystemic analysis of productive capacity of fish habitats (PCFH) in rivers, 2) Mesoscale modelling of the productive capacity of fish habitats in lakes and reservoirs, and 3) Predicting the entrainment risk of fish in hydropower reservoirs relative to power generation operations by combining behavioral ecology and hydraulic engineering. The knowledge generated by HydroNet is essential to balance the competing demands for limited water resources and to ensure that hydropower is sustainable, maintains healthy aquatic ecosystems and a vibrant Canadian economy. © copyright 2011 Periodicals postage paid at Bethesda.

Coles C.A.,Memorial University of Newfoundland | Arisi J.A.,Edmonton | Organ M.,Nalcor Energy | Veinott G.I.,Canadian Department of Fisheries and Oceans
Applied and Environmental Soil Science | Year: 2014

Concentrations of Cu, Cr, and As in soils surrounding 26 Douglas Fir Chromated Copper Arsenate (CCA) treated utility poles and in rainwater runoff from a new CCA treated utility pole segment (log) suspended outside in a cylinder were studied. The age of the utility poles, distances from the poles, rainfall amounts, and characteristics of soil samples including cation exchange capacity (CEC), pH, and total organic carbon (TOC) were considered. Heavier rainfall, damp conditions, and more weathered poles contributed to the greatest leaching of Cu, Cr, and As. The maximum measured soil concentrations of Cu, Cr, and As were 37.5, 65.5, and 38.9 mmol/kg and maximum Cu, Cr, and As concentrations in rainwater run-off were 14, 77.7 and 55.8 μmol/L. Metal concentrations decreased with distance from the poles and, except at one utility pole location, Cu was the most leached of the three elements. The As appeared to have greater mobility in the soil than the Cr. Along the transmission line nearest the coast and from which the greatest amount of samples was collected, soil CEC and TOC values were the highest and the CEC and TOC were directly and strongly correlated. © 2014 Cynthia A. Coles et al.

News Article | April 20, 2016

It’s a tale as old as time: energy company proposes big project, energy company says it will have no effects on the local population, local population says it’ll actually poison their land, and their people, for decades. Classic! The energy company in question here is Nalcor Energy, and the project is the multi-billion dollar Muskrat Falls hydroelectric dam in Labrador, Newfoundland, which got the green light from the provincial government in 2012. Flooding the reservoir to build the dam will release toxic methylmercury into the area around nearby Lake Melville, but Nalcor argues that it will be diluted enough to have no effect on the local Inuit population. But a new study, commissioned by the aboriginal Nunatsiavut Government and completed by scientists from Memorial University, Harvard, and the University of Manitoba, says that the toxic mercury released during the dam’s construction will have highly detrimental effects on the area’s wildlife and the aboriginal people who live off of it. More than 200 individuals (and their children and grandchildren) could be affected by the toxic mercury, the study’s authors concluded. Additionally, 66 percent of the community in nearby Rigolet will be pushed above acceptable mercury levels, per the most conservative US Environmental Protection Agency guidelines, according to the report. Nalcor’s more positive assessment of the dam’s effects was ”false and based on incorrect assumptions,” a summary of the study for policymakers states. “The findings from epidemiological studies show that [mercury] is associated with lifelong neurocognitive deficits,” Harvard epidemiologist and study co-author Elsie Sunderland told me. “This isn’t something that you would see visibly. It’s basically a direct impact on their brain development, so they wouldn’t realize the potential they would have without this kind of exposure.” One of the main indicators of this kind of mercury exposure is children with lowered IQs, Sunderland said. Gilbert Bennett, vice-president of the Nalcor project that oversees the Muskrat Falls dam, said in a prepared statement sent to Motherboard that "we do not predict that creation of the Muskrat Falls reservoir will heighten risk to people in Lake Melville." “We will carefully review the assumptions, approaches, parameters and outcomes of the study by Nunatsiavut Government, and any implications of the report on the project’s ongoing environmental effects monitoring programs,” the statement reads. A spokesperson for Newfoundland and Labrador's minister of environment and conservation Perry Trimper said the minister has yet to make a decision on the environmental impacts of the Muskrat Falls project, and will take the recent study's findings into consideration. Watch more from Motherboard: Oil and Water According to Sunderland, contamination of the region would take just 120 hours, and the effects would persist for decades. “We are looking at multiple generations of exposure to higher levels of methylmercury,” Sunderland said. So, how did Nalcor not catch this, if these findings are right? According to Sunderland, Nalcor simply did not take the needed measurements, and instead just assumed that the mercury would be diluted. If Nalcor had done the work, they would have seen that this is flatly untrue, she contended. “I don’t see this as a difference in opinion, or a difference in findings,” said Sunderland. “That’s a misrepresentation, because they didn’t have any findings. They didn’t study the physical characteristics of the estuary.” Nalcor declined to comment directly on this allegation. To offset the impacts of releasing methylmercury into the environment, the researchers suggest completely clearing the area of trees, vegetation, and topsoil. Even then, however, the report suggests around 30 Inuit people will be negatively affected by the high levels of mercury. “Removal of soil from the reservoir was not considered during the environmental assessment and therefore is not part of our construction plans,” Bennett said in his statement. The flooding of the reservoir to build the Muskrat Falls dam is scheduled to take place later this year, and the dam is set to be constructed by 2017.

O'Connor S.A.,Ikon Science | Green S.,Ikon Science | Goodman W.,Ikon Science | Heinemann N.,Ikon Science | And 3 more authors.
76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014 | Year: 2014

World-wide, prospectivity has been proven in deep-water and discoveries made. Examples include Gulf of Mexico and West Africa. A frequent problem remains however, that is, these new plays have little if any well calibration therefore making assessment of risk on all levels, problematic. Once a prospect has been identified in the deep-water, the next stage is to de-risk this. One of the key components of this process is to use knowledge of the pressure regime to ascertain (a) the risk of top seal integrity from mechanical seal risking and (b) the drilling window(the fracture pressure minus the pore pressure), if this is too narrow then potentially a prospect is too risky/expensive to drill. Without any well calibration to estimate the likely pressure regime, (a) and (b) become very difficult and/or inaccurate. To help reduce the risk in unexplored environments we present in this paper several approaches that can be adopted to model pore pressure in deep-water settings, not just in Labrador, but globally, in basis such as the Voring in Mid-Norway as well as in Mauritania, Ghana and Cameroon. This theoretical or "geological modelling" approach can then be used to sense-check the pore pressure interpretation from seismic velocity.

O'Connor S.A.,Ikon Science | Green S.,Ikon Science | Heinemann N.,Ikon Science | Wright R.,Nalcor Energy | And 3 more authors.
75th European Association of Geoscientists and Engineers Conference and Exhibition 2013 Incorporating SPE EUROPEC 2013: Changing Frontiers | Year: 2013

The future of exploration in Labrador is focussed on transitioning from the shelf in to the deep-water region following the progress of exploration in other similar settings. Understanding the pressure history in such a frontier area must be built on robust use of analogues, i.e. Mid-Norway which has shown that significant discoveries can be made in such deep-water settings as in the deep-sea Nise Formation Fan reservoirs Mud-weights in many of the Labrador Shelf wells are low; however Pothurst P-19 took a very high kicks taken, implying under-balanced drilling and mis-understanding of the pore pressure regime in these Basins. Moreover in the Saglek and Hopedale Basins, the wells are shelfal to upper slope in terms of structural position and with the focus to move in to deeper water targets in the future. Following the announcement on September 13, 2011 to shoot large-scale multi-client 2D seismic survey of offshore Labrador into the deep water, understanding the shelf-to-deep water transition becomes even more crucial. Copyright © (2012) by the European Association of Geoscientists & Engineers All rights reserved.

Green S.,Ikon Science Canada Ltd. | O'connor S.A.,Ikon Science Ltd. | Edwards A.P.,Ikon Science Ltd. | Carter J.E.,Nalcor Energy | And 2 more authors.
Leading Edge | Year: 2014

In recent years, new deepwater seismic-based exploration work has resulted in the revision of existing basin boundaries and identification of new, potentially oil-bearing basins in the deepwater Labrador region. The petroleum potential in this deepwater area has also been encouraged by the identification of slick and seepage locations using 2D seismic data and satellite imagery. The importance is that surface slicks possibly are related to subsurface hydrocarbon migration. Thus, all recent data collated together show strong evidence for an active petroleum system in deep water. Many of the wells in shallow water have been drilled with low mud weights, suggestive of low pore pressures. However, where thick shale packages are present, significant overpressure is observed by significant kicks. Clearly, there is a close association between thick (and deep) shale packages and high pore pressure. Thus, one of the key risks in developing the deepwater potential is to understand the pressure regime. The success of this approach has been highlighted recently by successful discoveries such as the presalt Lulu field onshore Brazil and associated discoveries in Gabon and Angola and postsalt discoveries that include Jubilee field offshore Ghana and the associated discovery of Zaedyus field in French Guiana. The deepwater Vøring Basin of the Mid-Norway North Sea and the Labrador slope and deep water share a similar passive margin setting to each other, similar facies associations, and structural development.

News Article | October 27, 2016

"Work is set to resume at the Muskrat Falls hydroelectric site after the Newfoundland and Labrador government reached a deal with indigenous leaders that will add more delays to the controversial megaproject. Provincially owned Nalcor Energy used buses to remove protesters who had stormed the site last week and was bringing back about 1,000 employees to complete the work needed to protect the site’s infrastructure over the winter. Under the agreement, leaders from three indigenous communities will review engineering reports with the assistance of outside experts in order to be satisfied with Nalcor’s rationale to begin partial flooding. The utility says it needs higher water levels to protect the site from ice damage." Shawn McCarthy reports for the Toronto Globe and Mail October 26, 2016. "Battle Over Muskrat Falls: What You Need To Know" (CBC News)

Wright R.J.W.,Nalcor Energy | Atkinson I.M.,Nalcor Energy | Carter J.E.C.,Nalcor Energy
2nd EAGE/SBGf Workshop 2014 - Broadband Seismic: From Theory to Real Examples and the Road Ahead | Year: 2014

A large-scale long offset broadband 2D seismic program has been acquired in the slope and deepwater regions of offshore Newfoundland and Labrador, Canada. The survey was planned integrating well ties from the shelf, regional gravity data, and newly acquired satellite slick data to assess the hydrocarbon potential of under-/un-explored slope and deepwater areas. To accomplish the survey, Nalcor Energy, the state energy company of Newfoundland and Labardor, invested and partnered with TGS and PGS in the long offset GeoStreamer® seismic survey spanning from the Labrador Sea to the Jeanne d'Arc and Flemish Pass in the south as shown in Figure 1. The early data results from this 2011-2013 program (47,000 line km) have resulted in the identification and delineation of new basins, play types, and AVO supported leads. The evaluation of the data was in part initially focused on determining the quality and utility of using the new 2D broadband data for exploration prospect reservoir characterization purposes.

Haldar A.,Nalcor Energy | Veitch M.,Nalcor Energy | Andrews T.,Nalcor Energy | Tucker K.,Nalcor Energy
43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010 | Year: 2010

Overhead lines are designed to withstand meteorological loads such as wind, ice, combined wind and ice and static residual loads due to broken components and/or ice shedding. A line could be subjected to dynamic overloading when a triggering event is caused by a component failure. In this situation, a shock wave propagates through the system and a redistribution of the force takes place. If the capacity of the remaining system can not support this force redistribution, the line may experience a cascade failure. A cascade phenomenon is defined when the failure zone includes many towers and is well extended beyond the location of the initial triggering event. For example, when a line is overloaded with primary loads (meteorological loads) the failure of the "weakest link" would most likely trigger an event. As the large amount of stored energy is released, substantial dynamic impact loads (transverse and vertical, as well as longitudinal) can be imposed on the remaining components in the system. Depending on the components' residual (reserved) strengths to withstand these large dynamic impact loads, the failure zone could propagate well beyond the location of the initial failure. The paper presents a systematic methodology to model both static and dynamic behaviors of a transmission line section after the breakage of a conductor. The model is developed using the ADINA program (Automatic Dynamic Incremental Nonlinear Analysis). The length of a cascade failure zone is estimated based on a finite element model of a typical 230 kV line section where both transient (peak dynamic) and steady state (quasi static residual) loads are evaluated. The numerical model considers the following cases: (1) first tower next to the break remains intact, (2) first tower fails and the force redistribution in the remaining line system is assessed and (3) load reduction device (LRD) is activated on the first tower. Under the last two scenarios, it is shown that there will be no cascade failure using LRD while one could expect a number of tower failures when the LRD is not used.

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