MANAGEMENT OF AGING PIPING THROUGH REASONABLE ASSURANCE ASSESSMENTS AND INSPECTION PRIORITIZATION


11th International Conference on CANDU® Maintenance and Nuclear Components - 2017 Oct. 01-04

Presented at:
11th International Conference on CANDU® Maintenance and Nuclear Components
2017 Oct. 01-04
Location:
Toronto, ON Canada
Session Title:
Aging Management 1 - Major Components

Authors:
A. Roukema (Structural Integrity Associates, Inc.)
D. Newsom (Structural Integrity Associates, Inc.)
  

Abstract

All US nuclear power plants have been inspecting and remediating buried piping as part of their required U.S. NEI 09-14 Guideline for the Management of Underground Piping and Tank Integrity response. Most US plants have entered into the next phase of NEI-09-14 and NRC guidance for committed and enduring programs in ensuring buried pipe integrity. As a large majority of buried piping inspections have been completed at US Plants and more are planned, the ability to prioritize and reduce cost of inspections based on risk becomes advantageous. In addition, the ability to disposition inspection resources based on expected degradation can help plants more cost effectively and efficiently manage the life and integrity of these critical assets.
The NEI 09-14 initiative provides guidance on how to group assets into risk classifications that dictate the required number of inspections and the locations of each inspection. Risk scores are based on the dynamic segmentation process, which relatively ranks the risk of each line based on risk significant parameters as defined by EPRI. If reasonable assurance can be demonstrated by the minimum required inspections for each group, additional scheduled inspections can be eliminated.
The EPRI BPWorks, and SI MAPPro suite of programs automates the risk ranking process to provide an overall risk picture for all lines and systems. Further, the Reasonable Assurance module automates the risk groupings based on user selected inputs from the NEI 09-14 guidance, resulting in the ability to target inspections. If no severe indications are found during the minimal inspections process, reasonable assurance can be achieved and inspections can be eliminated.
This presentation will focus on how U.S. plants have been approaching buried piping inspection prioritizations and risk.


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