An F82H steel pressurized tube creep capsule for irradiation in HFIR

Padhraic L. Mulligan; Hideo Sakasegawa; Hiroyasu Tanigawa; Christian M. Petrie; Joel L. McDuffee; Yutai Katoh

doi:10.1016/j.nme.2018.05.011

An F82H steel pressurized tube creep capsule for irradiation in HFIR

Padhraic L. Mulligan, Hideo Sakasegawa, Hiroyasu Tanigawa, Christian M. Petrie, Joel L. McDuffee, Yutai Katoh

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

A novel capsule design has been developed for measurement of irradiation creep in pressurized tubes and is being used to irradiate reduced activation ferritic/martensitic F82H steel creep test specimens. These tests are being conducted in the flux trap of the High Flux Isotope Reactor at the Oak Ridge National Laboratory. The capsule design uses a tight-fitting corrugated aluminum foil placed in the center of a vanadium alloy holder to conduct heat from the centrally located test specimen. The foil acts as a compressible thermal interface between the pressurized tube and holder, maintaining a constant thermal resistance (and thus a constant tube temperature gradient) during irradiation, regardless of differential thermal expansion, creep, and swelling in the test specimen. Mechanical interference with creep deformation of the specimen tube is minimized by using a thin (0.05 mm) foil with sufficient room to crush. Finite element analysis of the contact pressure between the specimen and foil, combined with thermal creep in the foil, showed little interference with specimen stress conditions. Specimens were designed to experience hoop stresses of 380, 300, 150, and 0 MPa at a temperature of 300 °C while being irradiated to a dose of 3.7 dpa. Passive SiC thermometry is located within the pressurized tube and the holder material for confirmation of experiment irradiation target temperatures. This work discusses aspects of the capsule's fabrication and design, including thermal models of the capsule during irradiation.

Original language	English
Pages (from-to)	254-260
Number of pages	7
Journal	Nuclear Materials and Energy
Volume	15
DOIs	https://doi.org/10.1016/j.nme.2018.05.011
State	Published - May 2018

Funding

This material is based upon work supported by the US Department of Energy, Office of Science, Office of Fusion Energy Sciences under contract number DE-AC05-00OR22725, and QST of Japan, SPP contract NFE-17-06547. Notice of Copyright: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Funders	Funder number
U.S. Department of Energy
Office of Science
Fusion Energy Sciences	DE-AC05-00OR22725
National Institutes for Quantum and Radiological Science and Technology	NFE-17-06547

Keywords

F82H IEA heat
HFIR
Irradiation creep
Pressurized tube

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10.1016/j.nme.2018.05.011

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title = "An F82H steel pressurized tube creep capsule for irradiation in HFIR",

abstract = "A novel capsule design has been developed for measurement of irradiation creep in pressurized tubes and is being used to irradiate reduced activation ferritic/martensitic F82H steel creep test specimens. These tests are being conducted in the flux trap of the High Flux Isotope Reactor at the Oak Ridge National Laboratory. The capsule design uses a tight-fitting corrugated aluminum foil placed in the center of a vanadium alloy holder to conduct heat from the centrally located test specimen. The foil acts as a compressible thermal interface between the pressurized tube and holder, maintaining a constant thermal resistance (and thus a constant tube temperature gradient) during irradiation, regardless of differential thermal expansion, creep, and swelling in the test specimen. Mechanical interference with creep deformation of the specimen tube is minimized by using a thin (0.05 mm) foil with sufficient room to crush. Finite element analysis of the contact pressure between the specimen and foil, combined with thermal creep in the foil, showed little interference with specimen stress conditions. Specimens were designed to experience hoop stresses of 380, 300, 150, and 0 MPa at a temperature of 300 °C while being irradiated to a dose of 3.7 dpa. Passive SiC thermometry is located within the pressurized tube and the holder material for confirmation of experiment irradiation target temperatures. This work discusses aspects of the capsule's fabrication and design, including thermal models of the capsule during irradiation.",

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author = "Mulligan, {Padhraic L.} and Hideo Sakasegawa and Hiroyasu Tanigawa and Petrie, {Christian M.} and McDuffee, {Joel L.} and Yutai Katoh",

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AU - Mulligan, Padhraic L.

AU - Sakasegawa, Hideo

AU - Tanigawa, Hiroyasu

AU - Petrie, Christian M.

AU - McDuffee, Joel L.

AU - Katoh, Yutai

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AB - A novel capsule design has been developed for measurement of irradiation creep in pressurized tubes and is being used to irradiate reduced activation ferritic/martensitic F82H steel creep test specimens. These tests are being conducted in the flux trap of the High Flux Isotope Reactor at the Oak Ridge National Laboratory. The capsule design uses a tight-fitting corrugated aluminum foil placed in the center of a vanadium alloy holder to conduct heat from the centrally located test specimen. The foil acts as a compressible thermal interface between the pressurized tube and holder, maintaining a constant thermal resistance (and thus a constant tube temperature gradient) during irradiation, regardless of differential thermal expansion, creep, and swelling in the test specimen. Mechanical interference with creep deformation of the specimen tube is minimized by using a thin (0.05 mm) foil with sufficient room to crush. Finite element analysis of the contact pressure between the specimen and foil, combined with thermal creep in the foil, showed little interference with specimen stress conditions. Specimens were designed to experience hoop stresses of 380, 300, 150, and 0 MPa at a temperature of 300 °C while being irradiated to a dose of 3.7 dpa. Passive SiC thermometry is located within the pressurized tube and the holder material for confirmation of experiment irradiation target temperatures. This work discusses aspects of the capsule's fabrication and design, including thermal models of the capsule during irradiation.

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An F82H steel pressurized tube creep capsule for irradiation in HFIR

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