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ASTM Selected Technical Papers
Small Specimen Test Techniques Applied to Nuclear Reactor Vessel Thermal Annealing and Plant Life Extension
By
WR Corwin
WR Corwin
1
Oak Ridge National Laboratory
,
Oak Ridge, TN
;
symposium co-chairman and editor
Search for other works by this author on:
FM Haggag
FM Haggag
2
Oak Ridge National Laboratory
,
Oak Ridge, TN
;
symposium co-chairman and editor
Search for other works by this author on:
WL Server
WL Server
3
ATI Incorporated
,
San Ramos, CA
;
symposium co-chairman and editor
Search for other works by this author on:
ISBN-10:
0-8031-1869-4
ISBN:
978-0-8031-1869-0
No. of Pages:
471
Publisher:
ASTM International
Publication date:
1993

As nuclear power plants approach end-of-license (EOL) and consideration is given to license renewal, there is an ever increasing need to expand the amount of data obtainable from the original surveillance specimens. A laser welding technique to reconstitute broken Charpy specimens is being developed to produce both conventional and miniaturized Charpy specimens. This paper reports on early laser welding development efforts and summarizes previous proof-of-principle experiments on a 1/16 scale miniaturized Charpy test. In order to benchmark the laser welding procedure, the laser-reconstituted specimen data have been compared with the original specimen data. In addition, the microstructure after welding has been examined to ensure that the material in the vicinity of the notch is essentially unchanged after the welding process. Data which characterize the thermal transient during welding are obtained by attaching thermocouples to the specimens. Other important considerations include perturbation of the stress field near the notch, dynamic stress waves, and contact of the weld region with the tup.

Precise control of welding parameters has been demonstrated, heat-affected zones as small as 0.25 mm can be achieved, and sufficient penetration depth can be obtained to enable welding thick sections (1T or greater) to yield conventional Charpy specimens or fracture toughness specimens and thin sections (̃5 mm) to yield Miniaturized Notch test (MNT) specimens.

1.
Manahan
,
M. P.
and
Charles
,
C.
, “
A Generalized Methodology for Obtaining Quantitative Charpy Data From Test Specimens of Nonstandard Dimensions
,“
Nuclear Technology
, Vol.
90
,
05
1990
.
2.
Manahan
,
M. P.
, “
Oyster Creek Pressure Vessel Re-Insertion Capsule Design
,“
MPM Research & Consulting
, final report to General Electric Nuclear,
25
09
1990
.
3.
Perrin
,
J.
,
Wullaert
,
R.
,
McConnell
,
P.
,
Server
,
W.
, and
Fromm
,
E.
, “
Reconstituted Charpy Impact Specimens
,”
EPRI, Battelle Columbus Laboratories, 2nd Fracture Control Corporation
, Research Project 2055-3, NP-2759,
12
1982
.
4.
Fabry
,
A.
,
Puzzolante
,
J. L.
,
VonWalle
,
E.
,
Vandermeulen
,
W.
,
Vandevelde
,
J.
, and
Von Ransbeeck
,
T.
, “
Changing the Notch Orientation of Charpy V Specimens by Stud Welding of Broken Remnants
,”
SCK-CEN
,
Belgium
.
5.
Manahan
,
M. P.
, “
Determination of Fracture Behavior of Ferritic Steels Using Miniaturized Specimens
,“
Journal of Nuclear Materials
,
1989
, pp. 321–330.
6.
Manahan
,
M. P.
, “
Determination of Charpy Transition Temperature of Ferritic Steels Using Miniaturized Specimens
,“
Journal of Materials Science
 0022-2461,
1990
, pp. 3429–3438.
7.
Manahan
,
M. P.
, “
Miniaturized Fracture Toughness Testing During the Plant Life Extension Period
,” invited paper presented at the American Society for Testing and Materials Second International Conference on Subsize Specimens,
01
1992
.
8.
Hertzberg
,
R. W.
,
Deformation and Fracture Mechanics of Engineering Materials
, 3rd ed.,
Wiley
,
New York
,
1989
.
9.
Manahan
,
M. P.
, “
Statistical Analysis Methodology for Mechanics of Fracture, SAM McFRAC: Users Manual
,“ code package based on the Werbull statistic for Charpy and fracture toughness data analyses,
1989
.
10.
Manahan
,
M. P.
,
Rosenfield
,
A. R.
, and
Vanecho
,
J. A.
, “
Final report on Miniaturized Fracture Mechanics Feasibility Study to Corporate Technical Development
,”
Battelle Columbus Laboratories
, Columbus, OH,
1985
.
11.
Rolfe
,
S. T.
and
Barsom
,
J. M.
,
Fracture and Fatigue Control in Structure
,
Prentice-Hall
,
Englewood Cliffs, NJ
,
1977
.
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