N-1Redacted Work Order
47 passages
Why do this project? Boiler component assessment during the 2006 Life Extension Study identified the requirement that the secondary superheater (SSH), reheat (RH) outlet assembly and boiler drains system. including the blowdown tank and as...
AI summary The 2006 Life Extension Study identified the need to replace the secondary superheater, reheat outlet assembly, and boiler drains system (including blowdown tank and vents) for Unit #5 to ensure reliable operation.
Summary The utility boiler for Unit #5 at Trenton Generating Station was shut down as part of the Planned Annual Maintenance in July 2009. The major scope of work for the boiler was removal of all asbestos (Guild), strengthening all buck-s...
AI summary Unit #5's boiler at Trenton Generating Station was shut down during July 2009 maintenance. Major work included asbestos removal (Guild), structural reinforcement (B & W), equipment replacement (Mitsubishi, Sunny-Corner), and water-wall panel repairs. Eleven SSH tubes were replaced as part of the maintenance scope.
Introduction During the August/September 2009 shutdown, the boiler was inspected internally to determine the condition and assessment. Sections of the boiler were repaired to ensure the Unit's integrity could be maintained.
AI summary During the August/September 2009 shutdown, an internal inspection of the boiler was conducted to assess its condition, and repairs were made to ensure the unit's integrity.
Cold Re-Heat - Up Pass # 6 - Tubes 1-20 - 8th Floor This section was surveyed via swing stages. Thirty-five (35) locations for a total of one hundred fifty-seven (159") inches were found to be below minimum wall. These areas were repaired...
AI summary A survey of Cold Re-Heat Up Pass #6 Tubes 1-20 on the 8th Floor identified 35 locations with 159 inches of wall thickness below minimum standards. Repairs were conducted via pad weld overlay, and subsequent inspections confirmed the repairs met acceptable standards.
Secondary SH Inlet - Up Pass 5 - 6 - Tubes 1-24 - 8-8 1/4 Floor The survey of this section revealed thirty-eight (38) areas for a total of one hundred sixteen {116"} identified for pad weld overlay. These areas were repaired, inspected and...
AI summary The survey identified 116 areas requiring pad weld overlay repairs, which were completed and accepted. Five shields were identified for replacement but remained unreplaced, potentially affecting system integrity.
Secondary SH Intermediate - Up Pass 4-5 - Tubes 25-56 - 81/2 - 9th Floor The survey of this section revealed no mechanical work required,
AI summary The survey of the specified infrastructure section (Secondary SH Intermediate - Up Pass 4-5 - Tubes 25-56 - 81/2 - 9th Floor) found no mechanical work required, indicating the infrastructure may be in acceptable condition.
Sec SH Outlet / RH-2 - Up Pass 3-4 - Tubes 57-68; 1-10; 9-9 1/2 Floor An extensive survey was carried out in this section. There were eleven [11] Secondary SH Outiet tubes with wall thickness less than 0.200". These tubes were replaced wit...
AI summary An infrastructure survey identified 11 tubes with wall thickness below 0.200" requiring replacement with 8' sections, and 109 tubes with thickness 0.201-0.252" needing 284 shields for protection. The text raises a question about whether these tubes were actually shielded.
ReHeat Finish - Pri SH Finish - Up Pass 1-2 - Tubes 31-40; Tubes 1-4 - 10 - 101/2 Floor The survey of this section revealed thirty-three (33) areas for a total of one hundred twenty-three (123) inches identified for pad weld overlay. These...
AI summary The survey identified 33 areas requiring 123 inches of pad weld overlay repairs on tubes, which were completed and accepted. Six tubes were also identified for shield installation.
Crossover Tubes - Up Pass 1 - 10 1/2 Floor The survey of this section revealed one {1} area for a total of eight {8} identified for pad weld overlay. This area was repaired and found acceptable. There were eighteen shields identified for r...
AI summary A survey identified eight areas requiring pad weld overlay repairs on crossover tubes at the Lingan Generating Station, which were completed and accepted. Eighteen shields were identified for replacement. The work was conducted by Nova Scotia Power Inc and ALSTOM Canada Inc.
Primary SH 3 - Down Pass # 1-2 - Tubes 5-20 - 10 1/2 - 10th Floor The survey of this section revealed two (2) areas for a total of ten inches (10") identified for pad weld overlay. These areas were repaired and found acceptable,
AI summary A survey identified two areas requiring pad weld overlay repair on tubes in the specified section. Repairs were completed and deemed acceptable following inspection.
Primary SH 2 - Down Pass # 2-3 - Tubes 21-44 - 10-9 1/2 Floor The survey of this section revealed twenty-nine (29) areas for a total of one hundred seventy-six (176") inches identified for pad weld overlay. These areas were repaired and fo...
AI summary A survey identified 29 areas requiring 176 inches of pad weld overlay repairs, which were completed and deemed acceptable. Two shields were also identified for replacement in the specified infrastructure section.
Primary SH 1 - Down Pass # 3-4 - Tubes 45-66 - 9 1/2 - 9th Floor The survey of this section revealed six (6) areas for a total of thirty-four (34") identified for pad weld overlay. These areas were repaired and found acceptable.
AI summary The survey identified 34 areas requiring pad weld overlay repairs in the specified section, which were completed and found acceptable following the repairs.
Headers The following headers were inspected with a borescope: Rear – lower water-wall header and Bast lower water-wall header. No indications were noted; however a 14" long X 3/8" piece of steel was removed from the Rear lower water-wall...
AI summary Inspection of boiler headers revealed no significant issues, though a 14-inch steel fragment was removed from the Rear lower water-wall header. Hand hole caps were installed and deemed acceptable during the inspection.
Denerator Heater and Storage Tanks A visual and magnetic particle inspection was carried out in the Deaerator Storage and Deaerator Heater vessels. All circumferential, longitudinal and attachment welds in the storage vessel were inspected...
AI summary Magnetic particle inspection (MPI) of Deaerator Heater and Storage Tanks at Lingan Generating Station found no weld defects but identified deterioration in heater tray box structures, which were repaired. The inspection was conducted by Nova Scotia Power Inc. and ALSTOM Canada Inc.
HP Heaters 5-4 and 5-6 Division Plates - The HP Heaters 5-4 and 5-6 were disassembled by NSPI. A new division plate was installed on Heater 5-4 and the division plate on 5-6 was repaired. Repair areas - There were several areas in both hea...
AI summary NSPI disassembled HP Heaters 5-4 and 5-6, installed a new division plate on 5-4, repaired the division plate on 5-6, replaced seal plates, and conducted visual and Magnetic Particle Inspection (MPI) on all areas.
Conclusions and Recommendations During the next Planned Shutdown, the following areas should be surveyed in addition to the normal boiler survey: Up Pass 4, SSH Outlet - Due to low UT readings, a full survey should be conducted. Furnace Wa...
AI summary The document recommends additional inspections during the next Planned Shutdown, including a full survey of Up Pass 4 due to low UT readings and replacement of four water-wall panels at the Lingon Generating Station. Contact details for Nova Scotia Power Inc are provided.
Lower Furnace A visual and UT survey was carried out on the waterwalls with the following noted: No repairs were required on the East and West Water walls. The South Wall was inspected at the IR's with no work required. The hanging curtain...
AI summary Inspections of the Lower Furnace waterwalls revealed no required repairs on the East and West walls, but noted deterioration on the South Wall's hanging curtains. A boiler hydro test detected a small leak on the East Water Wall, indicating potential maintenance needs.
Air Heater A visual inspection was carried out in the Air Heater with 11 tubes identified to be found leaking. These tubes were plugged during this outage.
AI summary A visual inspection identified 11 leaking tubes in the Air Heater, which were plugged during an outage. The inspection focused on equipment maintenance and integrity.
Summary The utility boiler for Unit #5 at Trenton Generating Station was shut down as part of the Planned Annual Maintenance in June 2007. The major scope of work for the boiler was three {3} waterwall panels replaced, one {1} on the West...
AI summary Unit #5's boiler at Trenton Generating Station was shut down during June 2007 maintenance for replacing three waterwall panels (one West, two South) and five SSH tubes, reflecting routine infrastructure upkeep at the facility.
Lower Furnace A visual and UT survey was carried out on the waterwalls with the following. The South Waterwall {Rear} was surveyed with twelve {12} areas for a total of two hundred sixty-nine inches {269"} overlayed with pad welding. Also,...
AI summary The document details a visual and UT survey of waterwalls at a power station, including measurements of pad welding, replacement of wall panels, and MT inspections. It recommends reviewing wall data for potential 2008 panel replacements due to low UT readings and existing weld conditions.
Secondary SH Intermediate / Outlet - Up Pass 4 - 9 Floor The survey of this section revealed zero {0} areas identified for pad weld overlay and there were zero {0} shields identified for replacement. There were five {5} tubes replaced due...
AI summary The survey of the Secondary SH Intermediate / Outlet - Up Pass 4 - 9 Floor identified no areas requiring pad weld overlay or shield replacement, but five tubes were replaced due to low ultrasonic testing (UT) readings.
ReHeat 2 Inlet / Intermediate - Up Pass 3 - 9 1/2 Floor The survey of this section revealed four {4} areas for a total of twenty-two inches {22"} identified for pad weld overlay, Also there were sixteen {16} shields identified for replacem...
AI summary The survey identified four areas requiring 22 inches of pad weld overlay and 16 shields needing replacement in the ReHeat 2 Inlet/Intermediate section. These findings highlight maintenance needs for infrastructure integrity.
Primary SH 3 - Down Pass # 1 - 10 1/2 Floor The survey of this section revealed twenty-two {22} areas for a total of one hundred thirty-nine inches {139"} identified for pad weld overlay.
AI summary A survey identified 22 areas requiring 139 inches of pad weld overlay on the Primary SH 3 - Down Pass #1 - 10 1/2 Floor section, indicating maintenance needs for infrastructure integrity.
Primary SH 1 - Down Pass #4 - 9 Floor The survey of this section revealed seven {7} areas for a total of twenty-three inches {23"} identified for pad weld overlay. c/o Nova Scotla Power inc Lingon Generaling Station New Waterford, N.S. Can...
AI summary The survey identified 23 inches of pad weld overlay across seven areas. Contact details for Nova Scotia Power Inc. (NSPI) and ALSTOM Canada Inc. are provided, indicating their involvement in the inspection or maintenance activity.
Primary SH 1-Down Pass # 5 - 8 % Floor ! ) Tho survey aftWs seotion revealed two {2} areas for a total offour inohes {4") identified for pad weld overlay,
AI summary A survey identified two areas requiring weld overlay repairs, totaling four inches, in the Primary SH 1-Down Pass #5 infrastructure. The 8% floor reference may relate to regulatory or technical thresholds for maintenance or safety standards in the context of the asset.
West. Center and East Economizel' - 8 Floor The three (3) sections of the Upper and Lower Economfzerwero inspected wIth no mechanical work required durIng this outage.
AI summary Inspection of the West, Center, and East Economizel' sections on the 8th floor revealed no mechanical work was required during the outage, indicating the Upper and Lower Economfzerwero sections were in compliance with operational standards.
Summary The utility boiler for Unit #5 at Trenton Generating Station was shut down as part of the Planned Annual Maintenance in June 2006. The major scope of work for the boiler was the Life Assessment Inspection. In addition to the assess...
AI summary Unit #5's boiler at Trenton Generating Station was shut down for maintenance in June 2006. Key work included a Life Assessment Inspection, replacement of 41 tubes due to low wall thickness, and repairs to hairpin bends, waterwall panels, and economizer supports.
Secondary SH Inlet - Up Pass 6 to 5 - 8 to 8 1/2 Floor The front and division wall penetrations were visually inspected and 25% of the platens on tubes 1-24 were inspected with UT as per the scope of work supplied by Generation Services. T...
AI summary Inspections using visual and ultrasonic testing (UT) were conducted on mechanical components, revealing areas requiring weld overlay repairs. The work, including 22" of weld overlay on elements and 47.5" on walls, was completed and found acceptable per the NDE Report (Tab #9).
Secondary SH Outlet - Up Pass 4 to 3-9 to 9 1/2 Floor The scope of work as supplied by Generation Services was carried out as well as an extensive survey was carried out due to low wall thickness measurements on tubes 57-68. The survey det...
AI summary A survey revealed 41 tubes with wall thickness below ASME code in the Secondary SH Outlet, leading to their replacement. 10% of butt welds were radiographed and found acceptable. Results are detailed in Tab 11 of the attached NDE Report.
ReHeat 2 Inlet - Up Pass 4 to 3 - 9 to 9 1/2 Floor The ReHeat Inlet section on tubes 1-10 were inspected with nineteen {19} areas for a total of seventy-nine {79} inches identified for pad weld overlay. There were also thirty-four (34) shi...
AI summary The ReHeat 2 Inlet section (tubes 1-10) required 79 inches of pad weld overlay repairs across 19 areas and replacement of 34 shields. Inspections confirmed repairs were acceptable, with results documented in Tab #12 of the NDE Report.
ReHeat 2 Intermediate - Up Pass 3 to 2 - 9 1/2 to 10 Floor The ReHent Intermediate section from tubes 11-30 were inspected with one (1) area for a total of fifteen (15) inches identified for weld overlay. There were also eight (8) shields...
AI summary The ReHeat 2 Intermediate section (tubes 11-30) required weld overlay repairs on 15 inches of tubing, replacement of 8 shields, and replacement of 13 hairpin bends. Radiography confirmed 52 welds, with one repair detected and resolved. Results are detailed in Tab #13 of the NDB Report.
ReHeat 2 Finish - Up Pass 2 to 1 - 10 to 10 % Floor c/o Nova Scola Power Inc Lingan Generaling Station New Waterford, N.S. Canada Tel.: (902) 862-6422 Ext 3331 Fax: (902) 862-6087 AISTOM Canada Inc. The ReHeat 2 Finish section from tubes 3...
AI summary The ReHeat 2 Finish section of tubes 31-40 underwent inspection and repair during a shutdown, including pad weld overlays, tube replacements, and NDT methods like Magnetic Particle Inspection. All repairs were found acceptable, with results documented in the NDE Report.
Primary SH Finish - Up Pass 2 to 1-10 to 10 1/2 Floor The scope of work supplied by Generation Services on Tubes 1-4 was completed with no mechanical work required. Results of this section are found in Tab # 15 of the attached NDE Report.
AI summary The scope of work for Tubes 1-4 by Generation Services was completed without mechanical intervention. Results are documented in Tab #15 of the attached NDE Report.
Primary SH Crossovers - Up Pass 1 to Down Pass #1 - 10 1/4 Floor The crossovers between up pass # 1 and down pass # 1 were inspected with one shield identified for replacement. Results of this section are found in Tab # 16 of the attached...
AI summary Inspection of primary SH crossovers between Up Pass 1 and Down Pass #1 identified one shield requiring replacement. Detailed results are documented in Tab #16 of the attached NDB Report.
Primary SH 3 - Down Pass #1 to 2 - 10 % to 10 Floor The scope of work supplied by Generation Services was completed on tubes 5-20. There were two (2) shields identified for replacement. Results of this section are found in Tab # 18 of the...
AI summary The scope of work by Generation Services on tubes 5-20 was completed, identifying two shields for replacement. Results are detailed in Tab #18 of the attached NDE Report, which includes findings from non-destructive testing evaluations.
Primary SH 2 - Down Pass #2 to 3 - 10 1/2 to 10 Floor A detailed survey was carried out on tubes 21 – 44 due to the large quantity of existing pad weld overlaid areas. The survey detected forty (40) areas for a total of two hundred forty-n...
AI summary A survey of tubes 21–44 identified 40 areas requiring 249 inches of pad weld overlay and 34 shields for replacement. Inspections confirmed existing pad welds were acceptable. Findings are detailed in Tab #19.
Primary SH 1 - Down Pass #3 to 4 - 9 1/2 to 9 Floor This section was surveyed as per the scope of work by Generation Services. There were three (3) areas for a total of 16" that required pad weld overlay. These areas were repaired, inspect...
AI summary The section was surveyed by Generation Services, with three areas requiring pad weld overlay repairs. These repairs were completed and inspected, resulting in acceptable findings. Detailed results are documented in tab #20 of the proceeding.
West, Center and East Economizer - 8 Floor The three (3) sections of the Upper and Lower Economizer were inspected as per the scope of work supplied by Generation Services. No mechanical work was required during this outage. Results of thi...
AI summary Inspection of the West, Center, and East Economizer sections on the 8th floor was conducted by Generation Services per their scope of work. No mechanical repairs were needed, with results documented in Tabs 21-23 of the attached NDE Report.
Blow-down Tank A visual inspection was carried out in the blow-down tank. There was no liner in this vessel. Minor wall loss was noted on the bottom discharge line and minor pitting on the bottom head. Results of the blow-down tank are fou...
AI summary A visual inspection of the blow-down tank revealed no liner, minor wall loss on the bottom discharge line, and minor pitting on the bottom head. Findings are documented in Tab #30 of the attached NDE Report.
Service Air Tank Visual and UT Thickness was carried out on the service air tank with no defects noted. Results of the service air tank are found in Tab #31 of the attached NDE Report.
AI summary Visual and ultrasonic thickness inspections of the service air tank found no defects. Results are detailed in Tab #31 of the attached NDE Report.
Instrument Air Tank Visual and UT Thickness was carried out on the instrument air tank with no defects noted. Results of the instrument air tank are found in Tab # 32 of the attached NDE Report.
AI summary Inspection of the instrument air tank via visual and ultrasonic thickness testing found no defects, with results detailed in Tab #32 of the attached NDE Report.
HP Inner Upper Casing A visual and Magnetic Particle Inspection was carried out on the HP Inner Upper Casing. Results are found in Tab #41of the attached NDB Report.
AI summary A Visual and Magnetic Particle Inspection (MPI) was conducted on the HP Inner Upper Casing, with findings documented in Tab #41 of the attached Non-Destructive Testing (NDB) Report.
HP Rotor A visual and Magnetic Particle Inspection was carried out on the HP Rotor. Results are found in Tab # 42 of the attached NDE Report.
AI summary A visual and Magnetic Particle Inspection (MPI) was conducted on the HP Rotor, with results documented in Tab #42 of the attached Non-Destructive Evaluation (NDE) Report. The inspection aligns with standard practices for assessing structural integrity and safety.
Nova Scotia Power Inc. Trenton Generating Station Unit No. 5 - 2006 Shutdown Generation Services Inspection Findings and Recommendations Report Project: TRE5 Assessment - Life Extension Work- 2015 Report by: W.O. No.: 203816 Date: 2006-06-...
AI summary This report details the inspection findings and recommendations for the Boiler Blow Down Tank at Nova Scotia Power Inc.'s Trenton Generating Station Unit 5, following its 2006 shutdown. The assessment is part of a 2015 life extension work project, focusing on equipment evaluation and maintenance needs.
Executive Summary: During the 2006 annual shutdown, the Boiler Blow Down Tank was inspected. It was found that the tank, was in relatively poor condition. For life extension, the recommendation is to do a complete replacement of the tank a...
AI summary The Boiler Blow Down Tank, installed in 1969 and in poor condition due to failed stainless steel liner and repeated repairs, requires replacement for life extension. The capital cost for replacing the tank and discharge line is estimated but not quantified in the text.
Scope of Inspection Results: The tank was inspected from inside only. A complete visual inspection was done and UT was done on certain areas. There were 2 areas identified in the bottom head which had signs of erosion, UT readings were tak...
AI summary The inspection of a tank was conducted internally, involving visual checks and ultrasonic testing (UT) on eroded areas. Erosion was detected in the bottom head (UT reading: 0.805") and bottom discharge line (UT reading: 0.204"). Reference documents include engineering plans and Alstom reports dated 2005–2006.
Recommendations: Recommendation is to do complete replacement oftank and disoharge line inoluding new insulation and cladding
AI summary The recommendation proposes a complete replacement of the tank and discharge line, including new insulation and cladding, as part of a regulatory proceeding. This action aims to ensure structural integrity and compliance with safety standards, addressing potential risks associated with aging infrastructure.