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Title: Evaluation of strontium-90 radial concentration profiles in Peach Bottom HTGR Core 2 fuel elements. HTGR base technology program, HTGR chemistry studies (189a 01329). [483 2000]

Abstract

Radial concentration profiles of /sup 90/Sr were evaluated for four fuel elements of the Peach Bottom High-Temperature Gas-Cooled Reactor (HTGR) Core 2. A transport model utilizing a single effective diffusion coefficient was able to reproduce the strontium concentraion profile in graphite at temperatures above about 960/sup 0/C. Below this temperature, ''tails'' were observed in the experimental concentration profile and the profiles could not be completely reproduced. Diffusion coefficients determined from the study were slightly below those used in current reference HTGR design calculations. Experimental data exhibited a relatively high concentration at the graphite surfaces. Data and analyses are presented which indicate this may be due to a spatial variation in graphite properties resulting from an inhomogeneous distribution of the graphite impregnant. Unlike earlier Peach Bottom Core 1 studies the /sup 90/Sr precursor contribution to the total /sup 90/Sr concentration profile was determined to be negligible for these Core 2 data, apparently due to the much lower fuel partial coating failure fraction in Core 2. The calculated /sup 90/Sr released from the core is less than that measured, but the amount released is well below the amount established by design criteria.

Authors:
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
OSTI Identifier:
6223309
Report Number(s):
ORNL/TM-6209; GJBX-6(79)
TRN: 79-007671
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; PEACH BOTTOM-1 REACTOR; FUEL ELEMENTS; DIFFUSION; FISSION PRODUCT RELEASE; FISSION PRODUCTS; GRAPHITE; PERMEABILITY; QUANTITY RATIO; RADIOACTIVITY TRANSPORT; REACTOR CORES; SPATIAL DISTRIBUTION; STRONTIUM 90; ALKALINE EARTH ISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBON; DISTRIBUTION; ELEMENTS; ENRICHED URANIUM REACTORS; EVEN-EVEN NUCLEI; GAS COOLED REACTORS; GRAPHITE MODERATED REACTORS; HELIUM COOLED REACTORS; HTGR TYPE REACTORS; INTERMEDIATE MASS NUCLEI; ISOTOPES; NONMETALS; NUCLEI; POWER REACTORS; RADIOACTIVE MATERIALS; RADIOISOTOPES; REACTOR COMPONENTS; REACTORS; STRONTIUM ISOTOPES; THERMAL REACTORS; YEARS LIVING RADIOISOTOPES; 210300* - Power Reactors, Nonbreeding, Graphite Moderated

Citation Formats

Haire, M.J. Evaluation of strontium-90 radial concentration profiles in Peach Bottom HTGR Core 2 fuel elements. HTGR base technology program, HTGR chemistry studies (189a 01329). [483 2000]. United States: N. p., 1979. Web. doi:10.2172/6223309.
Haire, M.J. Evaluation of strontium-90 radial concentration profiles in Peach Bottom HTGR Core 2 fuel elements. HTGR base technology program, HTGR chemistry studies (189a 01329). [483 2000]. United States. doi:10.2172/6223309.
Haire, M.J. Thu . "Evaluation of strontium-90 radial concentration profiles in Peach Bottom HTGR Core 2 fuel elements. HTGR base technology program, HTGR chemistry studies (189a 01329). [483 2000]". United States. doi:10.2172/6223309. https://www.osti.gov/servlets/purl/6223309.
@article{osti_6223309,
title = {Evaluation of strontium-90 radial concentration profiles in Peach Bottom HTGR Core 2 fuel elements. HTGR base technology program, HTGR chemistry studies (189a 01329). [483 2000]},
author = {Haire, M.J.},
abstractNote = {Radial concentration profiles of /sup 90/Sr were evaluated for four fuel elements of the Peach Bottom High-Temperature Gas-Cooled Reactor (HTGR) Core 2. A transport model utilizing a single effective diffusion coefficient was able to reproduce the strontium concentraion profile in graphite at temperatures above about 960/sup 0/C. Below this temperature, ''tails'' were observed in the experimental concentration profile and the profiles could not be completely reproduced. Diffusion coefficients determined from the study were slightly below those used in current reference HTGR design calculations. Experimental data exhibited a relatively high concentration at the graphite surfaces. Data and analyses are presented which indicate this may be due to a spatial variation in graphite properties resulting from an inhomogeneous distribution of the graphite impregnant. Unlike earlier Peach Bottom Core 1 studies the /sup 90/Sr precursor contribution to the total /sup 90/Sr concentration profile was determined to be negligible for these Core 2 data, apparently due to the much lower fuel partial coating failure fraction in Core 2. The calculated /sup 90/Sr released from the core is less than that measured, but the amount released is well below the amount established by design criteria.},
doi = {10.2172/6223309},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {2}
}