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Title: Assessing the Effects of Radiation Damage on Ni-base Alloys for the Prometheus Space Reactor System

Abstract

Ni-base alloys were considered for the Prometheus space reactor pressure vessel with operational parameters of {approx}900 K for 15 years and fluences up to 160 x 10{sup 20} n/cm{sup 2} (E > 0.1 MeV). This paper reviews the effects of irradiation on the behavior of Ni-base alloys and shows that radiation-induced swelling and creep are minor considerations compared to significant embrittlement with neutron ,exposure. While the mechanism responsible for radiation-induced embrittlement is not fully understood, it is likely a combination of helium embrittlement and solute segregation that can be highly dependent on the alloy composition and exposure conditions. Transmutation calculations show that detrimental helium levels would be expected at the end of life for the inner safety rod vessel (thimble) and possibly the outer pressure vessel, primarily from high energy (E > 1 MeV) n,{alpha} reactions with {sup 58}Ni. Helium from {sup 10}B is significant only for the outer vessel due to the proximity of the outer vessel to the Be0 control elements. Recommendations for further assessments of the material behavior and methods to minimize the effects of radiation damage through alloy design are provided.

Authors:
Publication Date:
Research Org.:
Knolls Atomic Power Laboratory (KAPL), Niskayuna, NY
Sponsoring Org.:
USDOE
OSTI Identifier:
883660
Report Number(s):
MDO-723-0043
TRN: US0603539
DOE Contract Number:  
DE-AC12-00SN39357
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 42 ENGINEERING; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ALLOYS; CONTROL ELEMENTS; CREEP; EMBRITTLEMENT; HELIUM; HELIUM EMBRITTLEMENT; IRRADIATION; NEUTRONS; PRESSURE VESSELS; RADIATIONS; SCRAM RODS; SEGREGATION; SOLUTES; SWELLING; TRANSMUTATION; NESDPS Office of Nuclear Energy Space and Defense Power Systems; NRPCT

Citation Formats

T. Angeliu. Assessing the Effects of Radiation Damage on Ni-base Alloys for the Prometheus Space Reactor System. United States: N. p., 2006. Web. doi:10.2172/883660.
T. Angeliu. Assessing the Effects of Radiation Damage on Ni-base Alloys for the Prometheus Space Reactor System. United States. doi:10.2172/883660.
T. Angeliu. Thu . "Assessing the Effects of Radiation Damage on Ni-base Alloys for the Prometheus Space Reactor System". United States. doi:10.2172/883660. https://www.osti.gov/servlets/purl/883660.
@article{osti_883660,
title = {Assessing the Effects of Radiation Damage on Ni-base Alloys for the Prometheus Space Reactor System},
author = {T. Angeliu},
abstractNote = {Ni-base alloys were considered for the Prometheus space reactor pressure vessel with operational parameters of {approx}900 K for 15 years and fluences up to 160 x 10{sup 20} n/cm{sup 2} (E > 0.1 MeV). This paper reviews the effects of irradiation on the behavior of Ni-base alloys and shows that radiation-induced swelling and creep are minor considerations compared to significant embrittlement with neutron ,exposure. While the mechanism responsible for radiation-induced embrittlement is not fully understood, it is likely a combination of helium embrittlement and solute segregation that can be highly dependent on the alloy composition and exposure conditions. Transmutation calculations show that detrimental helium levels would be expected at the end of life for the inner safety rod vessel (thimble) and possibly the outer pressure vessel, primarily from high energy (E > 1 MeV) n,{alpha} reactions with {sup 58}Ni. Helium from {sup 10}B is significant only for the outer vessel due to the proximity of the outer vessel to the Be0 control elements. Recommendations for further assessments of the material behavior and methods to minimize the effects of radiation damage through alloy design are provided.},
doi = {10.2172/883660},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 19 00:00:00 EST 2006},
month = {Thu Jan 19 00:00:00 EST 2006}
}

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