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On the proper fracture toughness properties to be used for pressurized thermal shock evaluations

Abstract

The traditional approach in the U.S. for evaluating PTS has relied upon probabilistic studies in which the toughness has been based upon the data used to generated the lower bound ASME Code K{sub IC} and K{sub IR} curves. A mean curve through this data with a Gaussian statistical distribution assumed, except for a lower bound cutoff of somewhere between 2 and 3 standard deviations, has been used. The RT{sub NDT} normalizing concept has been maintained which then requires the measured shift in Charpy V-notch toughness at the 41 J (30 ft-lb) energy level be used to adjust the position of the Code curves. The Master Curve method provides a unique alternative in providing a much better measure of real fracture toughness, plus the opportunity to use a more refined statistical distribution using Weibull statistics. There are active moves in the U.S. to Standardize and Codify the Master Curve (also termed T{sub 0} method). Benefits to both deterministic and probabilistic analyses will be realized since more realistic measures of toughness can be used.
Authors:
Server, W L [1] 
  1. ATI Consulting, Danville, CA (United States)
Publication Date:
Sep 01, 1997
Product Type:
Conference
Report Number:
IWG-LMNPP-96/1; CONF-9705163-
Reference Number:
SCA: 210200; PA: AIX-28:059641; EDB-97:116467; SN: 97001844573
Resource Relation:
Conference: IAEA specialists` meeting on methodology for pressurized thermal shock evaluation, Esztergom (Hungary), 5-8 May 1997; Other Information: PBD: 1997; Related Information: Is Part Of Methodology for pressurized thermal shock evaluation. Proceedings of the IAEA specialists meeting. Working material; PB: 457 p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; FRACTURE PROPERTIES; THERMAL SHOCK; EVALUATION; EMBRITTLEMENT; NUCLEAR POWER PLANTS; PRESSURE VESSELS; PROBABILITY; ROWE YANKEE REACTOR
OSTI ID:
519692
Research Organizations:
International Atomic Energy Agency, Vienna (Austria). International Working Group on Life Management of Nuclear Power Plants
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE97640092; TRN: XA9744631059641
Availability:
INIS; OSTI as DE97640092
Submitting Site:
INIS
Size:
pp. 137-161
Announcement Date:

Citation Formats

Server, W L. On the proper fracture toughness properties to be used for pressurized thermal shock evaluations. IAEA: N. p., 1997. Web.
Server, W L. On the proper fracture toughness properties to be used for pressurized thermal shock evaluations. IAEA.
Server, W L. 1997. "On the proper fracture toughness properties to be used for pressurized thermal shock evaluations." IAEA.
@misc{etde_519692,
title = {On the proper fracture toughness properties to be used for pressurized thermal shock evaluations}
author = {Server, W L}
abstractNote = {The traditional approach in the U.S. for evaluating PTS has relied upon probabilistic studies in which the toughness has been based upon the data used to generated the lower bound ASME Code K{sub IC} and K{sub IR} curves. A mean curve through this data with a Gaussian statistical distribution assumed, except for a lower bound cutoff of somewhere between 2 and 3 standard deviations, has been used. The RT{sub NDT} normalizing concept has been maintained which then requires the measured shift in Charpy V-notch toughness at the 41 J (30 ft-lb) energy level be used to adjust the position of the Code curves. The Master Curve method provides a unique alternative in providing a much better measure of real fracture toughness, plus the opportunity to use a more refined statistical distribution using Weibull statistics. There are active moves in the U.S. to Standardize and Codify the Master Curve (also termed T{sub 0} method). Benefits to both deterministic and probabilistic analyses will be realized since more realistic measures of toughness can be used.}
place = {IAEA}
year = {1997}
month = {Sep}
}