The Technical Standards and Safety Authority (TSSA) adopts standards and administers the policies, procedures and processes for the certification of welders and brazers regulated under the Technical Standards and Safety Act, 2000’s Ontario Regulation 220/01: Boilers and Pressure Vessels (BPVs). Businesses that repair/alter BPVs and install/repair associated piping systems are required to hold a Certificate of Authorization (COA) from TSSA or another Canadian jurisdiction. Companies with a National Board Certificate of Authorization (“R” stamp) are also acceptable for repairs/alterations of BPVs.
In the following directory, you can find a listing of businesses that hold a COA issued by TSSA. Please note that the information in this directory is updated periodically and may not reflect the most recent information available for each entry. If you have a question or concern regarding any of the information contained on this page, please contact customerservices@tssa.org or call 1-877-682-TSSA (8772).
ONTARIO POWER GENERATION INC – DARLINGTON NGS
- Address:
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1 HOLT RD S
BOWMANVILLE, ON
Canada
L1C 3Z8 - Products/Services:
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Pressure Relief Valve Repair (SHOP ONLY)
Status: 08-31-2025
Number: QA-00656
Repair of ASME Section I, IV, & VIII, Div.1, pressure relief valves using original equipment manufactured parts at the above location only in accordance with CSA Standard B51, Boiler, Pressure Vessel and Pressure Piping Code. Special processes are limited to machining. Test media shall include steam, air/gas, liquid.
CSA-N285.0 Nuclear Pressure Relief Valve Repair (SHOP ONLY)
Status: 08-31-2025
Number: QA-02021
Repair of nuclear Class 1, 1C, 2, 2C, 3 & 3C pressure relief valves using original equipment manufactured parts at the above location only in accordance with CSA Standard N285.0, General Requirements for Pressure Retaining Systems and Components in CANDU Nuclear Power Plants. Special processes are limited to machining. Test media shall include steam, air/gas and liquid.
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