This paper presents updated analyses of the cylinder specimen being used in the international Network for Evaluating Steel Components (NESC) large-scale spinning-cylinder project (NESC-1). The NESC was organized as an international forum to exchange information on procedures for structural integrity assessment, to collaborate on specific projects, and to promote the harmonization of international standards. The objective of the NESC-1 project is to focus on a complete procedure for assessing the structural integrity of aged reactor pressure vessels. A clad cylinder containing through-clad and subclad cracks will be tested under pressurized-thermal shock conditions at AEA Technology, Risley, U.K. Three-dimensional finite-element analyses were carried out to determine the effects of including the cladding heat-affected zone (HAZ) in the models. The cylinder was modeled with inner-surface through-clad cracks having a depth of 74 mm and aspect ratios of 2:1 and 6:1. The cylinder specimen was subjected to centrifugal loading followed by a thermal shock and analyzed with a thermoelastic-plastic material model. The peak KI values occurred at the clad/HAZ interface for the 6:1 crack and at the HAZ/base interface for the 2:1 crack. The analytical results indicate that cleavage initiation is likely to be achieved for the 6:1 crack, but questionable for the 2:1 crack.

ABAQUS, 1996, Theory Manual, Version 5.5, Hibbit, Karlson and Sorensen, Inc., Providence, RI.
Bass, B. R., 1996, “Report of Foreign Travel of B. R. Bass, Computational Physics and Engineering Division,” Lockheed Martin Energy Research Corp., Oak Ridge Natl. Lab., USNRC Foreign Trip Report, ORNL/FTR-5761, Apr.
Bass, B. R., and Bryson, J. W., 1982, “Applications of Energy Release Rate Techniques to Part-Through Cracks in Plates and Cylinders, Vol. 1, ORMGEN-3D: A Finite Element Mesh Generator for 3-Dimensional Crack Geometries,” Martin Marietta Energy Systems, Inc., Oak Ridge Natl. Lab., USNRC Report NUREG/CR-2997/V1 (ORNL/TM-8527), Dec.
Bryan, R. H., et al., 1985, “Pressurized-Thermal-Shock Test of 6-in.-Thick Pressure Vessels. PTSE-1: Investigation of Warm Prestressing and Upper-Shelf Arrest,” Martin Marietta Energy Systems, Inc., Oak Ridge Natl. Lab., USNRC Report NUREG/CR-4106 (ORNL-6135), Apr.
Keeney, J. A., 1994, “Analysis of Multiple Cracks in the NESC-1 Spinning Cylinder Experiment,” Martin Marietta Energy Systems, Inc., Oak Ridge Natl. Lab., USNRC Letter Report ORNL/NRC/LTR-94/35, Dec.
J. A.
, and
B. R.
, “
Fracture Analysis of the NESC-1 Spinning Cylinder Experiment
, Vol.
, pp.
. Feb.
Lacey, D. J., et al., 1991, “AEA Technology, Spinning Cylinder Test 4: An Investigation of Transition Fracture Behavior for Surface Breaking Defects in Thick-Section Steel Specimens,” Report AEA TRS 4098, June.
S. McAllister, 1996, “NESC, Minutes of the 7th TG3 Meeting (in combination with TG2),” Framatome, Paris la De´fence, NESC DOC TG3 (96)2, May.
This content is only available via PDF.
You do not currently have access to this content.