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Title: Measurement of Helium Generation in AISI 304 Reflector and Blanket Assemblies after Long-Term Irradiation in EBR-II

Abstract

Five hexagonal ducts constructed from AISI 304 stainless steel in the annealed state were removed from rows 8-14 of the EBR-II fast reactor after many years of irradiation to study the effect of atomic displacement rate on void swelling. For this objective it was important to assure that the observed differences in void swelling were not strongly influenced by variations in helium/dpa ratio. The two major contributions to helium production arise from the nickel and boron content of the steel. However, the boron content was unspecified and therefore unknown, but it was determined from an unirradiated archive duct by converting a well-defined fraction to helium and then measuring the helium content using isotopic dilution mass spectrometry. The same technique was used to measure the total helium in the irradiated duct specimens. After separating the boron contribution from the total measured helium it was possible to determine the contribution from various fast and thermal neutron interactions with the other major elements in the steel and compare the helium generation with predicted values. One important conclusion of the study is that the range of He/dpa ratios over the five subassemblies was not very large, allowing the observed changes in swelling to bemore » attributed primarily to variations in displacement rate and temperature.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
985048
Report Number(s):
PNNL-SA-45438
AT6020100; TRN: US1006070
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of ASTM International. JAI, 4(1):Article No. JAI100342; Journal Volume: 4; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; ATOMIC DISPLACEMENTS; BORON; DILUTION; DUCTS; FAST REACTORS; HELIUM; INTERSTITIAL HELIUM GENERATION; IRRADIATION; MASS SPECTROSCOPY; NICKEL; PRODUCTION; STAINLESS STEELS; STEELS; SWELLING; THERMAL NEUTRONS; Stainless steel, helium, fast reactors, boron, neutron flux-spectra

Citation Formats

Garner, Francis A., Oliver, Brian M., Greenwood, Lawrence R., Porter, D. L., and Allen, T. Measurement of Helium Generation in AISI 304 Reflector and Blanket Assemblies after Long-Term Irradiation in EBR-II. United States: N. p., 2007. Web. doi:10.1520/JAI100342.
Garner, Francis A., Oliver, Brian M., Greenwood, Lawrence R., Porter, D. L., & Allen, T. Measurement of Helium Generation in AISI 304 Reflector and Blanket Assemblies after Long-Term Irradiation in EBR-II. United States. doi:10.1520/JAI100342.
Garner, Francis A., Oliver, Brian M., Greenwood, Lawrence R., Porter, D. L., and Allen, T. Mon . "Measurement of Helium Generation in AISI 304 Reflector and Blanket Assemblies after Long-Term Irradiation in EBR-II". United States. doi:10.1520/JAI100342.
@article{osti_985048,
title = {Measurement of Helium Generation in AISI 304 Reflector and Blanket Assemblies after Long-Term Irradiation in EBR-II},
author = {Garner, Francis A. and Oliver, Brian M. and Greenwood, Lawrence R. and Porter, D. L. and Allen, T.},
abstractNote = {Five hexagonal ducts constructed from AISI 304 stainless steel in the annealed state were removed from rows 8-14 of the EBR-II fast reactor after many years of irradiation to study the effect of atomic displacement rate on void swelling. For this objective it was important to assure that the observed differences in void swelling were not strongly influenced by variations in helium/dpa ratio. The two major contributions to helium production arise from the nickel and boron content of the steel. However, the boron content was unspecified and therefore unknown, but it was determined from an unirradiated archive duct by converting a well-defined fraction to helium and then measuring the helium content using isotopic dilution mass spectrometry. The same technique was used to measure the total helium in the irradiated duct specimens. After separating the boron contribution from the total measured helium it was possible to determine the contribution from various fast and thermal neutron interactions with the other major elements in the steel and compare the helium generation with predicted values. One important conclusion of the study is that the range of He/dpa ratios over the five subassemblies was not very large, allowing the observed changes in swelling to be attributed primarily to variations in displacement rate and temperature.},
doi = {10.1520/JAI100342},
journal = {Journal of ASTM International. JAI, 4(1):Article No. JAI100342},
number = 1,
volume = 4,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}