Optimized High-Temperature Irradiation-Resistant Thermocouple for Fast-Response Measurements

The high-temperature irradiation-resistant thermocouple is the only temperature probe proven to withstand the high-temperature (>1290°C), high-radiation (a fluence of up to ∼1 × 1021 n/cm2) environments of nuclear reactor fuel design testing and/or over-temperature accident conditions. This repor...

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Autores principales:	Skifton Richard, Palmer Joe, Hashemian Alex
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	thermocouple irradiation-resistant in-pile sensor Physics QC1-999
Acceso en línea:	https://doaj.org/article/344e16baa1f64f928897275c403b6de2
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id	oai:doaj.org-article:344e16baa1f64f928897275c403b6de2
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spelling	oai:doaj.org-article:344e16baa1f64f928897275c403b6de22021-12-02T17:12:46ZOptimized High-Temperature Irradiation-Resistant Thermocouple for Fast-Response Measurements2100-014X10.1051/epjconf/202125306004https://doaj.org/article/344e16baa1f64f928897275c403b6de22021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_06004.pdfhttps://doaj.org/toc/2100-014XThe high-temperature irradiation-resistant thermocouple is the only temperature probe proven to withstand the high-temperature (>1290°C), high-radiation (a fluence of up to ∼1 × 1021 n/cm2) environments of nuclear reactor fuel design testing and/or over-temperature accident conditions. This report describes the improved performance of a molybdenum and niobium thermocouple by utilizing a coaxial design (i.e., a single wire grounded to the outer sheath). This optimized high-temperature irradiation-resistant thermocouple features a simplified design yet allows for more robust individual components. The niobium and molybdenum thermoelements can be used interchangeably in either the sheath or wire, depending on the intended application. Via a plunge test in flowing water, the response time of the coaxial build of the high-temperature irradiation-resistant thermocouple was determined to be 30x faster than that of the comparable ungrounded type-K thermocouples, and 10x faster than the grounded type-K thermocouples and traditional ungrounded high-temperature irradiation-resistant thermocouples (i.e., two-wire configurations). Furthermore, by capitalizing on the coaxial design, a multi-core high-temperature irradiation-resistant probe with multiple “single-pole” wires along the length of the sheath was proven feasible. This multi-core, thermocouple design was dubbed a “demicouple.” The high-temperature irradiation-resistant demicouple is primarily applied during fuel experiments to record multiple fuel-pin centerline temperature measurements using a single compact sensor. Furthermore, the shared “common” leg between demicouple junctions reduces error propagation in secondary measurements such as temperature differentials.Skifton RichardPalmer JoeHashemian AlexEDP Sciencesarticlethermocoupleirradiation-resistantin-pilesensorPhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 06004 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	thermocouple irradiation-resistant in-pile sensor Physics QC1-999
spellingShingle	thermocouple irradiation-resistant in-pile sensor Physics QC1-999 Skifton Richard Palmer Joe Hashemian Alex Optimized High-Temperature Irradiation-Resistant Thermocouple for Fast-Response Measurements
description	The high-temperature irradiation-resistant thermocouple is the only temperature probe proven to withstand the high-temperature (>1290°C), high-radiation (a fluence of up to ∼1 × 1021 n/cm2) environments of nuclear reactor fuel design testing and/or over-temperature accident conditions. This report describes the improved performance of a molybdenum and niobium thermocouple by utilizing a coaxial design (i.e., a single wire grounded to the outer sheath). This optimized high-temperature irradiation-resistant thermocouple features a simplified design yet allows for more robust individual components. The niobium and molybdenum thermoelements can be used interchangeably in either the sheath or wire, depending on the intended application. Via a plunge test in flowing water, the response time of the coaxial build of the high-temperature irradiation-resistant thermocouple was determined to be 30x faster than that of the comparable ungrounded type-K thermocouples, and 10x faster than the grounded type-K thermocouples and traditional ungrounded high-temperature irradiation-resistant thermocouples (i.e., two-wire configurations). Furthermore, by capitalizing on the coaxial design, a multi-core high-temperature irradiation-resistant probe with multiple “single-pole” wires along the length of the sheath was proven feasible. This multi-core, thermocouple design was dubbed a “demicouple.” The high-temperature irradiation-resistant demicouple is primarily applied during fuel experiments to record multiple fuel-pin centerline temperature measurements using a single compact sensor. Furthermore, the shared “common” leg between demicouple junctions reduces error propagation in secondary measurements such as temperature differentials.
format	article
author	Skifton Richard Palmer Joe Hashemian Alex
author_facet	Skifton Richard Palmer Joe Hashemian Alex
author_sort	Skifton Richard
title	Optimized High-Temperature Irradiation-Resistant Thermocouple for Fast-Response Measurements
title_short	Optimized High-Temperature Irradiation-Resistant Thermocouple for Fast-Response Measurements
title_full	Optimized High-Temperature Irradiation-Resistant Thermocouple for Fast-Response Measurements
title_fullStr	Optimized High-Temperature Irradiation-Resistant Thermocouple for Fast-Response Measurements
title_full_unstemmed	Optimized High-Temperature Irradiation-Resistant Thermocouple for Fast-Response Measurements
title_sort	optimized high-temperature irradiation-resistant thermocouple for fast-response measurements
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/344e16baa1f64f928897275c403b6de2
work_keys_str_mv	AT skiftonrichard optimizedhightemperatureirradiationresistantthermocoupleforfastresponsemeasurements AT palmerjoe optimizedhightemperatureirradiationresistantthermocoupleforfastresponsemeasurements AT hashemianalex optimizedhightemperatureirradiationresistantthermocoupleforfastresponsemeasurements
_version_	1718381369255526400

Optimized High-Temperature Irradiation-Resistant Thermocouple for Fast-Response Measurements

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