Topic:"Asset Retirement Obligation" in M12455

Why do this project? This project is consistent with the Mersey Hydro System sustaining capital strategy outlined in Appendix G of the 2025 ACE Plan. As part of NS Power's long-term planning under the HIP, targeted investments in aging gen...

AI summary This project aligns with the Mersey Hydro System's capital strategy and NS Power's long-term planning under the HIP. It involves refurbishing Upper Lake Falls Unit 2 to maintain safe and reliable operations, manage water levels, and mitigate risks during the deferral period before redevelopment or decommissioning.

Why do this project this way? Refurbishing this unit through the replacement of specific worn components is the most economical way to achieve the intended project scope, considering both the current condition of its components and the uni...

AI summary Refurbishing specific worn components of the unit is the most economical and reliable approach to achieve the project scope, ensuring continued support for water management on the Mersey River. Full replacement is not economically viable, and running the unit to failure is not technically feasible due to potential operational impacts.

ITM 1: Crack Evaluation Perform an evaluation of surface cracks using NDT methods (PT MT, or UT) and record findings, for the purpose of determining where the cracks are located, their size and their progression (or growth). This evaluatio...

AI summary This section outlines the process for evaluating surface cracks using non-destructive testing methods before repairs. The evaluation determines the location, size, and progression of cracks. If repairs are made, the repaired condition becomes the baseline for future evaluations. If no repairs are made, there is no new baseline, and the CI adjustment is based on changes from the original baseline.

ITM 2: Surface Condition Perform a comprehensive visual, profilometer and/or depth evaluation of the wetted surface and characterize the amount of area impacted by, surface deterioration (rust), and/or cavitation; the depth of damage and/o...

AI summary This section outlines the requirements for evaluating the surface condition of a unit, including visual, profilometer, and depth assessments. It emphasizes the need to evaluate surface deterioration, cavitation damage, and the impact of repairs on the condition index. Standards such as IEC 60041 are referenced for cavitation damage evaluation.

ITM 5: Loss of Material This ITM applies to loss of material other than on the surface. Perform a UT thickness test and complete a detail material loss assessment to determine a percent of the original material thickness that has been lost...

AI summary This section outlines the procedure for assessing loss of material beneath the surface, requiring ultrasonic thickness testing and a detailed evaluation to determine the percentage of material loss compared to the original installed value.

ITM: Twisted, Bent or Distored Shapes Location: Stationary Seal Rings/ Wear Rings Specification: ITM Complete: Yes No [Insert picture here, additional picture can be attached in "Attachments"] Comments: Stationary Seal Rings/ Wear Rings Po...

AI summary The document discusses inspection and testing methods (ITM) for stationary seal rings and wear rings, focusing on identifying twisted, bent, or distorted shapes, and provides adjustment factors for condition index (CI) based on the results of these inspections.

Equalizing Valve ITM: No ITMs Location: Equalizing Valve Specification: General Condition of Component ITM Complete: Yes No [Insert picture here, additional picture can be attached in "Attachments"] Comments: Amendment: Not present on many...

AI summary The Equalizing Valve component does not have specific ITMs (Inspection and Testing Methods) defined. It is noted that the valve is not present on many of NSP's hydro fleet, with the exception of the by-pass valve at Wreck Cove.

Turbine - Components Condition Assessment Summary: Wicket Gate Operating Mechanism Date: System : Location Plant : Unit : Wicket Gate Operating Mechanism Sub-Components Servomotors Shift/Operating Ring Linkages Shear Pins Bushings Locking...

AI summary The document provides a summary of the condition assessment for the Wicket Gate Operating Mechanism, including sub-components such as servomotors, shift/operating ring, linkages, shear pins, bushings, and locking mechanism. The assessment is part of a report submitted to the Nova Scotia Energy Board.

2 As noted in IR-1, The typical service life for all components varies based on design, 3 operating conditions, and maintenance. Per the Electric Power Research Institute (EPRI), 4 a hydro turbine is expected to run for 25 years between ma...

AI summary The document discusses the service life of hydro turbine components, referencing EPRI and CEATI's Hydro AMP methodology. Components like seals, bearings, and cooling coils have shorter lifespans (8-15 years) compared to major parts (25 years). Many components are original and over 25 years old, with some included in multiple refurbishment scopes from 1999, 2018, and 2025.

CI C0059783 – HYD Upper Lake Falls 2 Overhaul (M12455) NSPI Responses to NSEB Information Requests 1 Request IR-3: 21 is different than that included in IR-1 Attachment 6. NS Power leverages HydroAMP to 22 guide the condition assessment pr...

AI summary NSP uses HydroAMP, a tool developed by CEATI, to assess the condition of hydro turbines at Upper Lake Falls 2. The assessment considers parameters like physical condition, age, and maintenance history. The asset has a condition rating of 4 out of 5 and a risk score of 16, leading to the decision to prioritize the overhaul internally without external standards.

Request IR-1: - In the "DESCRIPTION" of NS Power's application, NS Power notes that "This project is for the - refurbishment of Upper Lake Falls Unit 2. The scope includes refurbishment of the turbine, - headcover, turbine shaft, turbine b...

AI summary NS Power has applied for the refurbishment of Upper Lake Falls Unit 2, including the turbine, headcover, and other components. The request asks for detailed descriptions of major systems, their functions, components, service life, and factors affecting their lifespan, as well as current maintenance and assessment procedures.

Request IR-2: - In the "DESCRIPTION" of NS Power's application, NS Power notes that "Upper Lake Falls Unit 2 was last overhauled in 1999 and is approaching 100 years of service life." - a) Please provide the detailed scope of work complete...

AI summary NS Power's application mentions that Upper Lake Falls Unit 2 was last overhauled in 1999 and is nearing the end of its service life. The request asks for details on the scope of work from the 1999 overhaul and the proposed current overhaul, including expected service life of components.

Request IR-5: - In the "Why do this project" of NS Power's application, NS Power notes that "Internal condition assessments were completed by NS Power in 2016 and 2023. Based on these assessments, the operating mechanisms (bushings, bearin...

AI summary NS Power's application for a project includes findings from internal condition assessments in 2016 and 2023, which identified issues with operating mechanisms at Upper Lake Falls Hydro Station. The request seeks clarification on actions taken, expected service life, assessment processes, and compliance with standards.

Request IR-6: - In the "Why do this project now" of NS Power's application, NS Power notes that "The last major overhaul was completed in 1999. A subsequent minor refurbishment was done in 2018 but only addressed components above the headc...

AI summary NS Power is requesting a complete refurbishment of a unit due to major issues identified in condition assessments, as the last major overhaul was in 1999 and a minor refurbishment in 2018 only addressed components above the headcover. The request includes questions about the 2018 work and a comparison with the proposed complete refurbishment.