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Fish Passage on the Connecticut River

Fish Passage on the Connecticut River

Holyoke Gas and Electric (HG&E) generates electric power at the Hadley Falls Station on the Connecticut River using two hydroelectric units with a total installed capacity of approximately 31 megawatts.  The first turbine was constructed in 1951 and is known as Hadley Unit 1.  The second turbine, known as Hadley Unit 2, was constructed in 1983.  Holyoke Dam impounds water for the Hadley Falls Station and several other generating stations on the Holyoke canal system.  It i...
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Continuing Work on Ensuring Emergency Cooling System Safety for Nuclear Power Plants

Continuing Work on Ensuring Emergency Cooling System Safety for Nuclear Power Plants

Safety of Emergency Core Cooling Systems (ECCS) has been a focus area for Alden since the 1980’s.  Head loss in strainers filtering debris out of the water that collects in containment, which is re-used to cool the reactor core during an accident, gained particular attention in 1992.  At this time, there was an incident at the Barsebäck boiling water reactor (BWR) power plant in Sweden, in which mineral wool was dislodged from piping, mixed with sludge from the suppression p...
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World Trade Center Flood Wall Testing

World Trade Center Flood Wall Testing

The Port Authority of NY & NJ (PANYNJ) is continuing to enhance flood resiliency at One World Trade Center, which is the tallest building in the Western Hemisphere. The flood resiliency system includes a defense in depth approach to protect against both surface and subterranean flooding. Hurricane Sandy, which inundated coastal areas in the Northeastern U.S., including Manhattan, highlighted the importance of flood resiliency at the World Trade Center and the associated transportation system...
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Alden Providing Services for Two U.S. DOE Low Impact Hydropower Awards

Alden Providing Services for Two U.S. DOE Low Impact Hydropower Awards

HOLDEN, MA — Alden will be contributing to two projects announced last month by the U.S. Department of Energy.  The department announced nearly $6.5 million dollars in funding research and development projects to advance low impact hydropower technology.  Alden will be contributing as a vendor to the following two projects, both in the area of rapidly deployable civil works technologies: 1.      Littoral Power Systems Inc.: Working in conjunction with Al...
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Physical Flow Testing and CFD Validation to Ensure Performance of Nuclear Industry Check Valves

Physical Flow Testing and CFD Validation to Ensure Performance of Nuclear Industry Check Valves

To ensure end user performance requirements, BNL Industries Inc. undertook a testing and analysis program to evaluate a revised design of its TwinLine double door check valve.  Alden used test data from an earlier TwinLine design (collected by Alden in the laboratory in 2003) to validate Computational Fluid Dynamics (CFD) for use in determining flow coefficient (Cv) for BNL’s new valve.  The overarching goal of this effort was to see if a new TwinLine design would meet the string...
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Journal Article on Contact Tank Hydraulic Efficiency

Journal Article on Contact Tank Hydraulic Efficiency

Together with co-authors from Colorado State University, Alden’s Zach Taylor has published an article in the Journal of Hydraulic Research on using Computational Fluid Dynamics (CFD) to design baffles in contactor tanks. In particular, the study addresses the question: for a given footprint of a rectangular tank with a specified inlet width, how does the hydraulic efficiency of a baffled tank depend on the configuration of internal baffles?
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Even Small Site Changes Can Risk Flood Safety For Nuclear Power Plants

Even Small Site Changes Can Risk Flood Safety For Nuclear Power Plants

HOLDEN, MA — After Japan’s Fukushima Dai-Ichi accident, there has been increased awareness and regulatory scrutiny regarding flood protection for U.S. nuclear power facilities. Yet one of the most important lessons learned from recent flooding hazard re-evaluations is that for reasons of security, modernization or convenience, important flood protection mechanisms and infrastructure are often ignored or undermined. In the years since most U.S. plants were constructed and initially l...
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