Results and Analysis of The ASTM Round Robin On Reconstitution (NUREG/CR-6777)

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Publication Information

Manuscript Completed: April 2002
Date Published: August 2002

Prepared by:
K. Onizawa*
E. van Walle**
W. Pavinich***
R. K. Nanstad

Oak Ridge National Laboratory
Managed by UT-Battelle, LLC
P.O. Box 2008
Oak Ridge, TN 37831-6151

Subcontractors:
*JAERI, Tokai, Ibaraki 319-1195, Japan
**SCK CEN, Boeretang, Mol, B-2400, Belgium
***Invex Engineering, Knoxville, TN 37923

C. Santos, NRC Project Manager

Prepared for:
Division of Engineering Technology
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

NRC Job Code W6953

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Abstract

In 1992, the American Society for Testing and Materials (ASTMA) initiated a Round Robin on Reconstitution (RRR) to contribute to the review of ASTM E1253 Guide on Charpy specimen reconstitution. The purpose of this RRR is to study the influence of parameters, such as the reconstitution technique, the insert length, the hammer tup geometry and the material. Ten laboratories participated in the RRR and performed Charpy specimen reconstitution on unirradiated material according to a predefined test matrix with both 10- and 14-umn inserts. All Charpy impact tests were conducted by the U.S. Nuclear Regulatory Commission sponsored Heavy-Section Steel Irradiation Program. Comparison of the absorbed energy and lateral expansion before and after reconstitution demonstrates that the loss due to reconstitution can be characterized by the combination of the insert length, the welding method, and the tup geometry used. In general, stud and upset-butt welding combined with the ASTM tup show the highest difference in energy whereas electron-beam welding with the ISO tup indicates the least. The variations among welding techniques and laboratories are also described. It is concluded that reconstitution does not affect any characteristic loads in the instrumented load-time traces, and that the 10-mm insert length should not be used in the upper shelf or mid-transition temperature region.

KEYWORDS: surveillance, Charpy, reconstitution, absorbed energy, insert, welding technique, instrumented Charpy impact test, load diagram