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NESCC Industry Needs Discussion

NESCC Industry Needs Discussion. November 7, 2013. Topics. NESCC 2013 Survey – review of results Buried pipe coatings Seals for doors and penetrations to prevent flooding NESCC discussion of additional industry needs. NESCC Survey Review.

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NESCC Industry Needs Discussion

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  1. NESCC Industry Needs Discussion November 7, 2013

  2. Topics • NESCC 2013 Survey – review of results • Buried pipe coatings • Seals for doors and penetrations to prevent flooding • NESCC discussion of additional industry needs

  3. NESCC Survey Review • NESCC provides value; Task Group Reports are generally useful to stakeholders • Construction Standards/New Plant issues • Aging of Plant Components and NDE • Cables • Concrete • Better communication between stakeholders; identify the needed standards and prioritize reviews

  4. Coatings on Buried Pipes • Steering Committee discussion identified the need for standards addressing buried pipe coatings. • Research revealed a standard is under development: • ASTM Committee D33, Coating and Lining Work for Power Generation Facilities, initiated the effort in 2012. • ASTM Work Item # WK36382: Standard Guide for the Selection of Coating for Maintenance, Repair, and Rehabilitation of Buried Pipe External Coatings for Power Generating Facilities. • Task group lead: Jon Cavallo, UESI NUCLEAR SERVICES • Jon provided a status update to the Steering Committee in October.

  5. ASTM Standard Guide • Guide will enable the user to logically address a number of technical aspects of buried pipe coating selection, including: • The function of buried pipe coatings in nuclear power plants. • The plant systems which may include coated buried pipe. • The generic types of field-applied buried pipe repair and refurbishment coatings. • Coating materials addressed include: • Liquid applied • Tape wraps • Shrink sleeves • Melt sticks • Paste wraps • Non-structural fiber composite wraps • Thermal spray

  6. Standard Guide - Continued • Technical factors which affect the selection of field-applied buried pipe repair and refurbishment coatings • In situ (in-ditch) factors which affect the selection of field-applied buried pipe repair and replacement coatings, and, • ASTM and other standards used to evaluate the performance of field-applied buried pipe repair and refurbishment coatings. • Provides guidance for the selection of coating materials to be used to repair of external coatings on buried pipe in power generating facilities and includes piping under the following conditions: • Low temperature (200 F) Low pressure (excludes TBD) • Excludes piping under federal regulations (PHMSA)

  7. Standard Guide - Continued • Selection of coating systems should be based upon both laboratory and in situ field testing • Laboratory testing –> accelerated screening • In situ field testing -> ensuring coating will perform satisfactorily in actual field conditions • In many cases, the same protective coating systems can be used for either repair or rehabilitation coating work

  8. Standard Guide - Continued • Precautions • Existing coatings may contain hazardous materials such as asbestos and lead • Repair/rehabilitation coating systems may contain hazardous and/or flammable materials • Limitations • Existing coatings -> visual inspection only • Do not used holiday detectors on existing coatings • Selection of repair/replacement coating systems may be limited by local, state or federal laws

  9. Standard Guide - Continued Pre-assessment • Obtain and review available information concerning existing coating system • Determine relative soil corrosivity • Observe condition of bedding and backfill materials • Replacement bedding and/or backfill materials may be required

  10. Standard Guide – Continued Existing coating system • Visually inspect existing coating system for • Holidays • Cracking • Peeling • Delamination • Wrinkling • Blistering • Substrate corrosion • Coatings specialist reviews results

  11. Standard Guide – Continued Select coating system based on • Soil corrosivity • Condition of existing coating system • Site environmental conditions • Degree of surface preparation achievable

  12. Standard Guide – Continued Post assessment • Currently there is no scientific method for predicting coating system end-of-life • Coating performance is determined by • Observation of impressed-current cathodic protection system performance • Periodic visual inspections of coating systems via bell holes • Empirically, coating system end-of-life is determined when • Full recoating cost < cost of repairs

  13. Standard Guide – Continued NACE complimentary activities • 2 new task groups in the area of buried pipe coatings for nuclear power plants: • TG 481 – nuclear power plant buried pipe coating condition assessment • TG 485 – identification of existing buried pipe coatings in nuclear power plants • First meetings of both: 9/24/2013

  14. NESCC Participation • Steering Committee feels that the NESCC can provide valuable information for the ASTM standard. • Proposing a ‘quick hit’ task group to develop a list of industry needs to be provided to the ASTM task group. • NESCC members are welcome to join the ASTM or NACE task groups (no need to be member of the SDO). • Requesting input from the NESCC.

  15. Seals for doors & penetrations to prevent flooding • Steering Committee discussion identified the need for standards addressing seals. • A search for existing standards was performed, yielding no results. • A request was sent by ANSI/Sally to SDOs asking for their input:

  16. Request for Information on Seal Standards The Nuclear Energy Standards Coordination Collaborative (NESCC) is seeking input from Standards Development Organizations related to an issue currently of concern in the nuclear energy industry:  Seal Standards for Doors and Penetrations to Prevent Flooding Damage.  Following the events at the Fukushima Daiichi Nuclear Power Station in 2011, the ability of nuclear power plants to withstand flooding has become a greater concern.  The majority of U.S. nuclear power plants have been in operation for several decades, and in many cases, some seals have been in place since the plants were built, and age-related degradation of seals could have occurred.  It is recognized that improved materials and assessment methods are now available, and the NESCC is requesting information on standards for such materials and methods. If your organization is developing or has published a standard related to this topic, please contact me at your earliest convenience.

  17. Response to Date • The following SDOs have replied to date: • ANS – no standards • ASME – closest are two of the B16 standards that discuss gaskets for pipe joints; however, these standards do not include design requirements for the gaskets • NIRMA – no standards • If no standards exist and if the concern is industry-wide, the NESCC may decided to pursue development of a standard • More information will be coming

  18. Open Discussion of Industry Needs

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