Application of Phased Array Sectorial Scanning (PASS) to Determine Check-Valve Operational Readiness at the Palo Verde Nuclear Station PUBLIC ACCESS

[+] Author Affiliations
Domingo A. Cruz

Palo Verde Nuclear Power Station, Tonopah, AZ

Jesse R. Delgado

IHI Southwest Technologies, Inc., San Antonio, TX

Paper No. NRC2014-5039, pp. 157-176; 20 pages
  • ASME/NRC 2014 12th Valves, Pumps, and Inservice Testing Symposium
  • ASME/NRC 2014 12th Valves, Pumps, and Inservice Testing Symposium
  • Rockville, Maryland, USA, June 23–25, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-9932-8
  • Compilation Copyright © 2019 ASME


The reliability of check valves is paramount to the safe operation of plant systems. This paper provides a description of the benefits of applying advanced phased array techniques to establish the operational readiness of swing-check valves in the static or dynamic operational modes. In addition, a utility model perspective is described explaining how the Phased Array Sectorial Scanning (PASS) data assessments can be used to support operational predictive maintenance decisions. A collaborative effort between Arizona Public Service Co., the Palo Verde plants, and IHI Southwest Technologies, Inc. (IHI), was realized when IHI personnel applied Phased Array Sequence Scanning techniques to swing-check valves operating in the closed static position, as well as to three identical valves operating in the dynamic open positions in Palo Verde Units 1, 2 and 3 respectively.

Paper published with permission.

Compilation Copyright © 2019 ASME
Topics: Valves
This article is only available in the PDF format.



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