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Use of an Offset in Assessing Radiation Embrittlement Data and Predictive Methods

[+] Author Affiliations
Naoki Soneda

CRIEPI, Tokyo, Japan

Colin English

Nexia Solutions, Didcot, Oxfordshire, UK

William Server

ATI Consulting, Pinehurst, NC

Paper No. PVP2006-ICPVT-11-93369, pp. 351-357; 7 pages
doi:10.1115/PVP2006-ICPVT-11-93369
From:
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 7: Operations, Applications, and Components
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4758-6 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME

abstract

Analyses of reactor pressure vessel (RPV) surveillance data from Charpy V-notch shift results coupled with our latest knowledge of the mechanisms of radiation embrittlement have led to new predictive correlations/models that have a strong technical underpinning. In this paper we examine how well the new CRIEPI embrittlement predicts US RPV surveillance data. Secondly, we note that within the US surveillance data sets there are indications that the data may follow the same form as the predictive models, but the data may be offset by a constant amount (either positive or negative) from the predictive values. This offset can be attributed in some cases to inadequate baseline data. In other cases, there does not appear to be a constant offset, or such an offset is hidden by data scatter. This paper also reviews the potential use of an offset adjustment and focuses on several surveillance datasets for comparisons.

Copyright © 2006 by ASME

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