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Title: The Effects of Maintenance Actions on the PFDavg of Spring Operated Pressure Relief Valves

The safety integrity level (SIL) of equipment used in safety instrumented functions is determined by the average probability of failure on demand (PFDavg) computed at the time of periodic inspection and maintenance, i.e., the time of proof testing. The computation of PFDavg is generally based solely on predictions or estimates of the assumed constant failure rate of the equipment. However, PFDavg is also affected by maintenance actions (or lack thereof) taken by the end user. This paper shows how maintenance actions can affect the PFDavg of spring operated pressure relief valves (SOPRV) and how these maintenance actions may be accounted for in the computation of the PFDavg metric. The method provides a means for quantifying the effects of changes in maintenance practices and shows how these changes impact plant safety.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Villanova University, Villanova, PA (United Staes)
  2. Exida LLC, Sellersville PA, (United States)
  3. Savannah River Nuclear Solutions (SRNS), Aiken, SC (United States)
  4. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
Publication Date:
OSTI Identifier:
1171508
Report Number(s):
SRNL-STI--2014-00404
Journal ID: ISSN 0094-9930
Grant/Contract Number:
AC09-08SR22470
Type:
Accepted Manuscript
Journal Name:
Journal of Pressure Vessel Technology
Additional Journal Information:
Journal Volume: 137; Journal Issue: 6; Journal ID: ISSN 0094-9930
Publisher:
ASME
Research Org:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING