NDLI: Non-Destructive Examination of Jacket Sections for ITER Central Solenoid Conductors

Content Provider	IEEE Xplore Digital Library
Author	Takahashi, Y. Suwa, T. Nabara, Y. Ozeki, H. Hemmi, T. Nunoya, Y. Isono, T. Matsui, K. Kawano, K. Oshikiri, M. Uno, Y. Tsutsumi, F. Shibutani, K. Okuno, K. Teshima, O. Kanaya, M. Sekiguchi, N.
Copyright Year	2002
Abstract	The Japan Atomic Energy Agency is responsible for procuring all amounts of central solenoid (CS) conductors for International Thermonuclear Experimental Reactor, including CS jacket sections. The conductor is cable-in-conduit conductor with a central spiral. A total of 576 Nb₃Sn strands and 288 copper strands are cabled around the central spiral and then wrapped with stainless steel tape whose thickness is 0.08 mm. The maximum operating current is 40 kA at magnetic field of 13 T. CS jacket section is circular in square type tube made of JK2LB, which is high manganese stainless steel with boron added. Unit length of jacket sections is 7 m, and 6400 sections will be manufactured and inspected. Outer/inner dimension and weight are 51.3/35.3 mm and around 100 kg, respectively. Since the CS conductor suffers 60000 cycles of high electromagnetic force in the lifetime, severe requirements were specified for jacket sections in terms of not only high mechanical performance at 4 K but also of the size of initial defects in the jacket section. The minimum allowable defect size is estimated to be 2 mm2 × 0.2 mm by linear elastic fracture mechanics. Eddy current test (ECT) and phased array ultrasonic test (PAUT) were developed for non-destructive examination. The defects on inner and outer surfaces can be detected by ECT. The defects inside the jacket section can be detected by PAUT. These technologies and the inspected results of more than 700 jacket sections are reported in this paper.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1
Ending Page	4
Page Count	4
File Size	676090
File Format	PDF
ISSN	10518223
Volume Number	25
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Probes Conductors Coils Inspection Solenoids Cable shielding Niobium-tin Non-destructive ITER Central Solenoid phased array ultrasonic test (PAUT) Central solenoid (CS) eddy current test (ECT) International Thermonuclear Experimental Reactor (ITER) jacket JK2LB non-destructive examination (NDE)
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Analysis of Internal-Tin $hbox{Nb}_{3}hbox{Sn}$ Conductors for ITER Central Solenoid

Establishment of Production Process of JK2LB Jacket Section for ITER CS

Cabling Technology of $hbox{Nb}_{3}hbox{Sn}$ Conductor for ITER Central Solenoid

Demonstration of JK2LB Jacket Fabrication for ITER Central Solenoid

Development of full-scale conductors for the ITER Central Solenoid Scalable Model Coils

Preparation for the ITER Central Solenoid Conductor Manufacturing

Experimental estimation of energy dissipation in ITER central solenoid superconductor

A conceptual design of the international thermonuclear experimental reactor central solenoid

Mechanical Properties of High Manganese Austenitic Stainless Steel JK2LB for ITER Central Solenoid Jacket Material

Non-Destructive Examination of Jacket Sections for ITER Central Solenoid Conductors

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