Published May 2009 | Version v1
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Characteristics of Nicorosil versus Nisil thermocouples for the in-core temperature monitoring system in HTTR

Creators

  • 1. Japan Atomic Energy Agency, Oarai Research and Development Center, Oarai, Ibaraki (Japan)

Description

An In-core temperature monitoring system measures primary coolant temperature at each hot plenum block with Type N thermocouples (Nicrosil versus Nisil thermocouples) inserted in hot plenum blocks in order to monitor condition of a reactor core during a reactor operation. Type N thermocouples are needed to have a long lifetime with high reliability under high temperature environment of about 1000degC, because they are used in the HTTR reactor pressure vessel. Thus, it was investigated the change in their characteristics on a basis of HTTR operational and maintenance data. As a result, it was confirmed that there was no significant change in the characteristic of Type N thermocouples after having used their thermocouples for more than 12000 hours in the HTTR reactor pressure vessel. This report shows that the characteristic change of Type N thermocouples used in HTTR. (author)

Availability note (English)

Available from JAEA; DOI: https://doi.org/10.11484/jaea-technology-2009-015

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Additional details

Identifiers

DOI
10.11484/jaea-technology-2009-015;

Publishing Information

Imprint Pagination
60 p.
Report number
JAEA-Technology--2009-015

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
41043216
Subject category
S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Descriptors DEI
CANNING; COOLANTS; ELECTRICAL INSULATION; GRAPHITE; HTTR REACTOR; IN CORE INSTRUMENTS; JAEA; PRIMARY COOLANT CIRCUITS; REACTOR CORES; TEMPERATURE MEASUREMENT; TEMPERATURE MONITORING; THERMAL CYCLING; THERMOCOUPLES
Descriptors DEC
CARBON; COOLING SYSTEMS; ELEMENTS; ENERGY SYSTEMS; ENRICHED URANIUM REACTORS; EXPERIMENTAL REACTORS; FABRICATION; GAS COOLED REACTORS; GRAPHITE MODERATED REACTORS; HELIUM COOLED REACTORS; HTGR TYPE REACTORS; JAPANESE ORGANIZATIONS; MATERIALS WORKING; MEASURING INSTRUMENTS; MINERALS; MONITORING; NATIONAL ORGANIZATIONS; NONMETALS; REACTOR COMPONENTS; REACTOR COOLING SYSTEMS; REACTOR INSTRUMENTATION; REACTORS; RESEARCH AND TEST REACTORS

Optional Information

Notes
7 refs., 36 figs., 13 tabs.; This record replaces 41025189