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Status Report: Welding Task Group

Status Report: Welding Task Group. R eport to NESCC – 28 March 2013 Tom Siewert – NIST siewertt@gmail.com. Objectives. Review the welding standards (ASME, AWS, etc.) used in nuclear construction Look for inconsistencies between them, and areas where they lag behind current technology

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Status Report: Welding Task Group

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  1. Status Report: Welding Task Group Report to NESCC – 28 March 2013 Tom Siewert – NIST siewertt@gmail.com

  2. Objectives • Review the welding standards (ASME, AWS, etc.) used in nuclear construction • Look for inconsistencies between them, and areas where they lag behind current technology • Make recommendations to the standards bodies that would streamline the construction of safer nuclear plants (value to stakeholders)

  3. Team (~50 Participants) • About ½ representing industry (mostly chairs of AWS technical subcommittees) • About ¼ representing associations • About ¼ representing government

  4. Timeline • First meeting – November, 2011 – face to face • Nine meetings since then (8 teleconferences and 1 face to face • Final report – Fall, 2013 (target)

  5. Structure • WTG – to oversee progress and evaluate recommendations drafted by working groups • Working Groups – by technical discipline • Welding Technology • Fabrication Techniques – Mark Holland – Interim Chair • Rebar Issues – Mike Gass – Vice Chair • Inspection Technology • Personnel/Qualification Issues – Jeff Fluckiger – Chair • Material Issues • Heat Treatment – Phil Flenner -- Chair

  6. Representative Technical Issues • Waveform-based Power Sources – new electronics permit alternate pulse shapes that may fall outside traditional procedures (WPS) • Phased-array Ultrasonic Inspection – new capabilities may speed inspections and find previously hidden imperfections • Digital X-ray Imaging Technology – replacing film technology can speed inspections and lower consumable costs -- May also allow CT imaging slides • Visual Inspection – technique may have advanced (NP 5380) • Personnel Certification - increasingly being required, but PE in welding had been discontinued

  7. Top 5 Needs (of end users) • Avoiding senseless requalification of welding procedures. Why do we need to requalify again and again to prove what we already know? The available prequalified welding procedures distributed by AWS cover only a fraction of what is needed. • Keeping individuals standards aligned with each other (especially those developed by different organizations). While AWS B2 requirements are currently well aligned with those of ASME Section IX, others are not. • Make repair decisions based on fitness-for-service assessments. Currently many repair decisions are made on workmanship standards, where unnecessary repairs often introduce additional damage that can be the source for later failures during service. Switching to repair decisions based on fracture mechanics would mean that only necessary repairs are made.

  8. Near-term Actions • Expand database with members qualifications • Fill empty slots in working group structures • Get top 5 needs from customers (end-users of the standards) • Assign needs to appropriate working group.

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