An Analysis of the Disturbance of a Uranium Oxide Capsule Surface Temperature Distribution Resulting From a Thermocouple Attached to the Inside Surface

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A study was initiated to determine the precision with which surface temperature measurements could be made in irradiation capsules containing ceramic fuel. A thermocouple was considered to be positioned in a longitudinal groove prepared in the uranium oxide and metallurgically bonded to the inside surface of the stainless steel clad. A fuel capsule having a 3/4 inch outside diameter, designed as a segment of the EGCR fuel element, and operating with a heat generation rating of 27,500 Btu/hr/lineal foot was assumed. The finite difference approximation was employed to study both the grounded and the ungrounded types of thermocouple junctions. It … continued below

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20 pages

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Newell, P. H. November 1, 1961.

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A study was initiated to determine the precision with which surface temperature measurements could be made in irradiation capsules containing ceramic fuel. A thermocouple was considered to be positioned in a longitudinal groove prepared in the uranium oxide and metallurgically bonded to the inside surface of the stainless steel clad. A fuel capsule having a 3/4 inch outside diameter, designed as a segment of the EGCR fuel element, and operating with a heat generation rating of 27,500 Btu/hr/lineal foot was assumed. The finite difference approximation was employed to study both the grounded and the ungrounded types of thermocouple junctions. It was found that when a short dummy lead is positioned axially adjacent to the thermocouple junction deviations of about 118 deg F and 101 deg F are obtained for the grounded and ungrounded junction, respectively; in both cases the indicated temperatures are in excess of the undisturbed clad surface temperatures. (auth)

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20 pages

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Other Information: Orig. Receipt Date: 31-DEC-62

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  • November 1, 1961

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  • Jan. 22, 2018, 7:23 a.m.

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  • Nov. 23, 2024, 3:58 a.m.

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Newell, P. H. An Analysis of the Disturbance of a Uranium Oxide Capsule Surface Temperature Distribution Resulting From a Thermocouple Attached to the Inside Surface, report, November 1, 1961; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1055697/: accessed April 22, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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