November 7, 2013

NESCC Industry Needs

Discussion

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

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

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.

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

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)

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

Standard Guide - Continued

* PrecautionsExisting coatings may contain hazardous materials such

as asbestos and leadRepair/rehabilitation coating systems may contain

hazardous and/or flammable materials

* Limitations

Existing coatings -> visual inspection onlyDo not used holiday detectors on existing coatingsSelection of repair/replacement coating systems may be

limited by local, state or federal laws

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

Standard Guide – Continued

Existing coating systemVisually inspect existing coating system for

HolidaysCrackingPeelingDelaminationWrinklingBlisteringSubstrate corrosion

Coatings specialist reviews results

Standard Guide – Continued

Select coating system based onSoil corrosivityCondition of existing coating systemSite environmental conditionsDegree of surface preparation achievable

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

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

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.

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:

ACI ASTM

ANS CSA Group

American Society of Civil Engineers Institute of Nuclear Materials Management

American Society of Heating, Refrigeration and Air-Conditioning

Engineers

Nuclear Information and Records Management Association

ASME NEMA

American Water Works Association MSS

American Welding Society

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.

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

Open Discussion of Industry Needs