B-1-(i)Appendix 1 - HSV-2024-043-CA01 Condition assessment - Factorydale
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Table 2: HydroAMP - Turbine Condition Scoring Physical Condition Scoring Cracks Results Condition Indicator Score No Cracking 2 Inactive Cracks 1 Active Cracks 0 Cavitation and Surface Damage
AI summary Table 2 outlines the HydroAMP turbine condition scoring system, focusing on physical condition indicators such as cracks and cavitation. Scores range from 0 to 2, with higher scores indicating better turbine condition.
Here, we establish what percentage of the time how much flow goes through the pipe (or the river, in case of a run-of-the-river unit), and then with the efficiency data for the turbine, a curve is generated. Unfortunately, for the Factoryd...
AI summary The text discusses the process of establishing flow rates through a pipe or river for a hydroelectric unit, using efficiency data to generate curves. Due to a lack of hydrology data for the Factorydale reservoir, data from the Kelley River was used for extrapolation. Design flows and percentages of time are assumed, leading to different extrapolated data scenarios.
% Flow m³/s Turbine efficiency Number of turbines Combined efficiency 0% 315.90 -0.23 0 0.00 5% 42.56 -0.23 1 -0.23 10% 28.88 -0.23 1 -0.23 15% 22.10 -0.19 1 -0.19 20% 17.83 -0.12 1 -0.12 25% 14.31 -0.04 1 -0.04 30% 12.93 0.03 1 0.03 35% 1...
AI summary The text presents a table showing flow duration and turbine efficiency curve data, with percentages indicating flow rates and corresponding turbine efficiency values. The data assumes a flow rate of 3.39 m³/s at 70% of the time, illustrating how turbine efficiency changes with varying flow rates.
Figure 78: New Turbine - NORCAN Resource and technical Specs, including provided turbine efficiency curve % m³/s efficiency turbines efficiency 0% 315.90 0.13 0 0.00 5% 42.56 0.13 1 0.13 10% 28.88 0.13 1 0.13 15% 22.10 0.16 1 0.16 20% 17.8...
AI summary The text presents a table with technical specifications and efficiency data for a new turbine, including efficiency curves at various flow rates and percentages. The data highlights turbine performance metrics such as efficiency and duration at different operational levels.
CANYON Option – 750 kW - $4,883,466 CAD It is important to note that Canyon estimates that, because the current design is quite ill (something that we agree with) the flow through the penstock is in fact restrained. The penstock has the ca...
AI summary The CANYON Option at 750 kW is estimated to cost CAD 4,883,466. The current penstock design is believed to be inadequate, restricting flow to 3.39 m3/s, below its capacity of 3.5 to 5 m3/s. CANYON estimates that with a flow of 4 m3/s, the unit can reach 750 kW, potentially achievable during the freshet season.
Figure 85: New Turbine - CANYON Resource and technical Specs % Flow m³/s Turbine efficiency Number of turbines Combined efficiency 0% 372.74 -0.05 0 0.00 5% 50.22 -0.05 1 -0.05 10% 34.07 0.10 1 0.10 15% 26.07 0.19 1 0.19 20% 21.04 0.32 1 0...
AI summary The document presents technical specifications and efficiency data for a new turbine, highlighting flow rates and turbine efficiency at different percentages. The data indicates that turbine efficiency increases with flow up to a certain point before stabilizing.
DIVE TURBINEN Option – 616 kW - $2,500,000 CAD Dive Turbinen took a little bit more conservative approach, reducing the gross head, and keeping the design flow at 3.398 m3/s. Figure 92: New Turbine – Dive Turbinen Resource and technical Sp...
AI summary Dive Turbinen's option involves a 616 kW turbine with a conservative approach, reducing gross head while maintaining a design flow of 3.398 m3/s. Technical specifications and resource details are presented with accompanying figures.
RE: Berwick Hydropower plant - lie-for-like replacement and repair From Ian Shea Date Fri 2024-09-20 15:51 To Javier Ojeda Hi Javier, Please use the following performance table for the replacement turbine. At this stage, I don't have perfo...
AI summary Ian Shea is providing a performance table for a replacement turbine at the Berwick Hydropower plant and requests a 95% factor to account for generator losses at full load due to the absence of performance curves from the generator supplier.
Note 1 - Shipping allowance and estimate subject to change Project Hydro Power Plant - Berwick - Fa actorydale 1 Head gross 23, 77 m 1 Max. Discharge Power Plant 3, 40 m3/s 1 Numbers of Turbines 1 piece 1 Turbine type: DIVE0888-7 00 nVAR 1...
AI summary The text provides technical specifications for a hydro power plant project in Berwick-Factorydale, including details on head gross, maximum discharge, turbine type, and electrical parameters such as voltage, current, and power.
RISK ASSESSMENT Risk Number System Component Risk Scenario Description Likelihood (1-5) Impact (1- 5) Risk Level (Likelihood x Impact) Mitigation Measures 1.1.1 Turbine Turbine Runner and blades Cavitation Pitting Cavitation causes the for...
AI summary The risk assessment identifies cavitation-related risks to turbine runners and blades, including pitting, cracking, and erosion leading to blade thinning. Mitigation measures include inspections, material upgrades, and operational adjustments.
B-1-(iii)Appendix 3 - HSV-2024-043-SREP02 Feasibility Study
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2.3.2 Scroll Case The proposed scroll case design adopts a spiral-shaped geometry concentrically surrounding the turbine, ensuring uniform flow distribution to each guide vane. This uniformity minimizes vibrations, torque fluctuations, and...
AI summary The scroll case design features a spiral geometry surrounding the turbine to ensure uniform flow, reduce vibrations, and enhance hydraulic efficiency. It is constructed with welded steel, epoxy coatings, and segmented for on-site assembly, adhering to IEC 60193 and ASME standards.
The following [Table 1](#page-33-1) shows a summary of the proposed equipment (continues in next page) Table 1: Summary - Proposed Equipment Equipment Name Description of Equipment Capacity/ Design Rating Draft Tube A draft tube is a conic...
AI summary The text provides a detailed description of various pieces of equipment used in hydraulic power systems, including their functions and design capacities. The table outlines components such as draft tubes, scroll cases, turbines, governors, generators, and switchgear, explaining their roles and performance metrics.
Equipment Name Description of Equipment Capacity/ Design Rating SCADA, Control, Automatizatio n, Protection and Measurement SCADA, Control, Automation, Protection, and Measurement refers to an integrated system that remotely monitors, mana...
AI summary The text describes various pieces of equipment used in power systems, including SCADA systems, power transformers, trash racks in penstocks, and excitation systems, detailing their functions and design capacities.
B-3TOB (NSEB) RIR 1 to 42 - Redacted
4 passages
Question(s): Please provide monthly generation records for the existing hydro plant for the last five years while in operation together with available records of water spillage, operating output, system availability, and outages (with the...
AI summary The document requests monthly generation records for an existing hydro plant over the past five years, including data on water spillage, output, availability, and outages. It also asks for the annual generator utilization rate and a comparison between the proposed new system and the historical generation of the existing system.
Question(s): On page 1 of the Application under introduction, BEC noted that there have been several major incidents that happened on the system that damaged the turbine and wicket gates, including incidents in 2006 and 2023. Paragraph 2 s...
AI summary The document raises questions about the refurbishment of a hydroelectric system, the effectiveness of protective devices in preventing damage to turbine components, inspection and maintenance procedures, and the root cause analysis of past incidents involving large objects damaging the system.
Response: The like-for-like option was developed as a restorative option intended to return the plant generally to its previous operating configuration and original output level, approximately 416 kW. Under that option, the replacement sco...
AI summary The like-for-like option aims to restore a hydroelectric plant to its original configuration with minimal upgrades, while the refurbishment option involves a full modernization with increased capacity and reliability. The like-for-like approach focuses on replacing only damaged components, whereas the refurbishment includes new equipment and systems.
Interrogatory: Question(s): Please explain the potential impact on water storage and reservoir levels if generating capacity is increased.
AI summary The interrogatory asks for an explanation of how increasing generating capacity might affect water storage and reservoir levels. The question focuses on the relationship between energy generation and water resources.
B-3-(i)Appendices - Redacted
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REQUEST FOR PROPOSALS Berwick Electric Commission Owner's Engineer for Factorydale Turbine Project BER2024-003 Issue Date: April 22, 2024 Closing Date: May 13, 2024 Closing Time: 2:00 pm ADT
AI summary Nova Scotia's Berwick Electric Commission is seeking proposals for an owner's engineer to work on the Factorydale Turbine Project, with the RFP issued on April 22, 2024, and due by May 13, 2024 at 2:00 pm ADT.
1.1 OVERVIEW As described in the Invitation, the wicket gates and turbine vanes at the BEC hydroelectric plant in Factorydale, Kings County, NS were severely damaged in early December 2023. The plant is now out of commission.
AI summary The BEC hydroelectric plant in Factorydale, Kings County, NS suffered severe damage to its wicket gates and turbine vanes in early December 2023, rendering the plant inoperable.
2.1.1 FACTORYDALE DAM The Factorydale Dam is a concrete gravity dam measuring 113 meters in length and reaching a maximum height of 5.2 meters, although much of the structure stands around 2 meters, or less. It features an 18.7 meter-long...
AI summary The Factorydale Dam is a concrete gravity dam with a spillway section for flood control. It has specific structural features, including stoplog gates and a rockfill core. A stage-discharge rating curve is used to estimate outflow based on reservoir levels, with adjustments made for backwater effects.
4 DAM SAFETY REVIEW The DSR was completed in general accordance with the CDA Dam Safety Guidelines, 2013. This DSR is intended as a systematic evaluation of the safety of the dam by means of inspection, assessment of performance, review of...
AI summary The Dam Safety Review (DSR) was conducted in accordance with the CDA Dam Safety Guidelines, 2013, to systematically evaluate the safety of the dam through inspection, performance assessment, review of management practices, and evaluation of the original design.
4.4.3 LEFT ENTOMBED ROCKFILL SECTION The rockfill at the left section of the dam has an upstream and downstream slope of 2H:1V, and there is a small area adjacent to where the dam emerges from the rockfill that is much steeper. Most of the...
AI summary The left entombed rockfill section of the dam has a 2H:1V slope on both upstream and downstream sides, with a steeper area near the dam's emergence from the rockfill. The rockfill appears unchanged since 2008, and no stability concerns exist where the entombed concrete core is intact and past overtopping events have not caused displacement.
1 INTRODUCTION Factorydale Dam is located at 2545 Harmony Road, within the limits of the Town of Berwick. The dam controls a watershed with 88.7 km2 that has three (3) upstream controls located at Sandy Lake Dam, Burnt Flowage and Randall...
AI summary Factorydale Dam is a concrete gravity structure located in Berwick, Nova Scotia, with a storage capacity of 26,000 m3. It was reinforced in 2008 and has undergone several upgrades, including spillway modifications and the addition of a steel catwalk. The dam is part of a larger watershed and is currently undergoing repairs to its penstock.
2 SYSTEM DESCRIPTION Factorydale Dam is located near the town of Berwick in King's County, Nova Scotia. The dam controls a catchment area of approximately 92.3 square kilometers and manages inflow from upstream sources including Burnt Dam...
AI summary The Factorydale Dam is located near Berwick, Nova Scotia, and controls a 92.3 square kilometer catchment area. The Randall Canal, which may collect flow from the Randall Lake watershed, could potentially increase peak runoff to the Factorydale Dam head pond by 20%, depending on flow draw and canal characteristics. However, this report does not consider runoff from the Randall Lake Watershed.
2.2 Factorydale Dam Factorydale Reservoir has a surface area of approximately three (3) hectares. We are unaware of any previous bathymetric surveys of Factorydale reservoir. An estimate of the stage-storage relationship from 2008 indicate...
AI summary The Factorydale Dam has a surface area of approximately three hectares. The stage-storage relationship for the reservoir was estimated in 2008 and adapted from a previously defined rating curve. Key elevations and corresponding storage volumes are provided in Table 2.1.
2.2.1 Factorydale Dam /Spillway The Factorydale Dam is a post-tensioned concrete gravity dam measuring 113 meters in length and reaching a maximum height of 5.2 meters, although much of the structure is around 2 meters tall. It features an...
AI summary The Factorydale Dam is a post-tensioned concrete gravity dam with a spillway that has shown inadequate capacity during flood events, leading to overtopping. A stage-discharge curve is provided to illustrate the dam's discharge characteristics.
3.2 Inflow Hydrograph For this hydrotechnical analysis, diversion flow from Randall Lake was excluded. Any diversion flow from Randall Lake would serve to increase the total runoff volume at Factorydale Dam. Deterministic analysis was comp...
AI summary The document discusses the exclusion of diversion flow from Randall Lake in a hydrotechnical analysis and outlines two methods for estimating runoff flood hydrographs: the River Basin Transfer method and a rainfall-runoff model in HEC-HMS. Equations for calculating flood hydrographs for different annual exceedance probabilities are also provided.
4.4.1 Dam Failure Modes The principal failure mode for concrete dams for the FwF condition is initiation of internal erosion through the foundation which causes an increase in seepage rates. The seepage rate progression results in an incre...
AI summary The principal failure mode for concrete dams under FwF conditions involves internal erosion leading to increased seepage, uplift pressures, and sliding. At Factorydale Dam, failure during FiF conditions is likely due to headwater and tailwater buildup, gallery filling, or cracking due to poor structural condition.
Table 3: Wind Stress Factor Calculations - Not adjusted for critical duration Chosen wind speed methodology Transfer Dam Consequence Classification Significant Freeboard Normal Minimum U land 37.9 m/s 25.2 m/s U water 45.5 m/s 30.2 m/s U A...
AI summary Table 3 presents wind stress factor calculations for a dam, considering different wind speed methodologies and freeboard levels. The table includes wind speeds for land and water under significant dam consequence classification, highlighting normal and minimum freeboard scenarios.
1.0 INTRODUCTION The purpose of this Technical Memorandum Report (TMR) is to present the methodology and results of stability analysis for rigid concrete structures at Factorydale Dam.
AI summary This Technical Memorandum Report (TMR) outlines the methodology and results of stability analysis for rigid concrete structures at Factorydale Dam, providing insights into the structural integrity and safety assessments conducted.
Inflow Design Flood (IDF) - Most severe inflow flood (volume, peak, shape, duration, timing) which a dam and its spillway must handle safely. Inspection - See "Dam safety inspection"
AI summary The Inflow Design Flood (IDF) refers to the most severe inflow flood that a dam and its spillway must handle safely, considering factors such as volume, peak, shape, duration, and timing. It is a critical consideration in dam safety and design.