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Title: Fiber optic sensors for nuclear power plant applications

Abstract

Studies have been carried out for application of Raman Distributed Temperature Sensor (RDTS) in Nuclear Power Plants (NPP). The high temperature monitoring in sodium circuits of Fast Breeder Reactor (FBR) is important. It is demonstrated that RDTS can be usefully employed in monitoring sodium circuits and in tracking the percolating sodium in the surrounding insulation in case of any leak. Aluminum Conductor Steel Reinforced (ACSR) cable is commonly used as overhead power transmission cable in power grid. The suitability of RDTS for detecting defects in ACSR overhead power cable, is also demonstrated.

Authors:
; ; ; ;  [1]
  1. Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu-603102 (India)
Publication Date:
OSTI Identifier:
22004022
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1430; Journal Issue: 1; Conference: 38. annual review of progress in quantitative nondestructive evaluation, Burlington, VT (United States), 17-22 Jul 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; ALUMINIUM; ELECTRIC CABLES; LMFBR TYPE REACTORS; MONITORING; NUCLEAR POWER PLANTS; OVERHEAD POWER TRANSMISSION; REACTOR INSTRUMENTATION; REACTOR SAFETY; SENSORS; SODIUM; STEELS; TEMPERATURE MEASUREMENT

Citation Formats

Kasinathan, Murugesan, Sosamma, Samuel, BabuRao, Chelamchala, Murali, Nagarajan, and Jayakumar, Tammana. Fiber optic sensors for nuclear power plant applications. United States: N. p., 2012. Web. doi:10.1063/1.4716333.
Kasinathan, Murugesan, Sosamma, Samuel, BabuRao, Chelamchala, Murali, Nagarajan, & Jayakumar, Tammana. Fiber optic sensors for nuclear power plant applications. United States. doi:10.1063/1.4716333.
Kasinathan, Murugesan, Sosamma, Samuel, BabuRao, Chelamchala, Murali, Nagarajan, and Jayakumar, Tammana. Thu . "Fiber optic sensors for nuclear power plant applications". United States. doi:10.1063/1.4716333.
@article{osti_22004022,
title = {Fiber optic sensors for nuclear power plant applications},
author = {Kasinathan, Murugesan and Sosamma, Samuel and BabuRao, Chelamchala and Murali, Nagarajan and Jayakumar, Tammana},
abstractNote = {Studies have been carried out for application of Raman Distributed Temperature Sensor (RDTS) in Nuclear Power Plants (NPP). The high temperature monitoring in sodium circuits of Fast Breeder Reactor (FBR) is important. It is demonstrated that RDTS can be usefully employed in monitoring sodium circuits and in tracking the percolating sodium in the surrounding insulation in case of any leak. Aluminum Conductor Steel Reinforced (ACSR) cable is commonly used as overhead power transmission cable in power grid. The suitability of RDTS for detecting defects in ACSR overhead power cable, is also demonstrated.},
doi = {10.1063/1.4716333},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1430,
place = {United States},
year = {Thu May 17 00:00:00 EDT 2012},
month = {Thu May 17 00:00:00 EDT 2012}
}
  • Fiber optic sensors can be used to measure a number of parameters, including temperature, strain, pressure and flow, for instrumentation and control of space nuclear power systems. In the past, this technology has often been rejected for use in such a high-radiation environment based on early experiments that revealed a number of degradation phenomena, including radiation-induced fiber attenuation, or 'graying', and Fiber Bragg Grating (FBG) fading and wavelength shift. However, this paper reports the results of recent experimental testing that demonstrates readability of fiber optic sensors to extremely high levels of neutron and gamma radiation. Both distributed Fiber Bragg Gratingmore » (FBG) sensors and single-point Extrinsic Fabry Perot Interferometer (EFPI) sensors were continuously monitored over a 2-month period, during which they were exposed to combined neutron and gamma radiation in both in-core and ex-core positions within a nuclear reactor. Total exposure reached approximately 2 x 10{sup 19} cm{sup -2} fast neutron (E > 1 MeV) fluence and 8.7 x 10{sup 8} Gy gamma for in-core sensors. FBG sensors were interrogated using a standard Luna Innovations FBG measurement system, which is based on optical frequency-domain reflectometer (OFDR) technology. Approximately 74% of the 19 FBG sensors located at the core centerline in the in-core position exhibited sufficient signal-to-noise ratio (SNR) to remain readable even after receiving the maximum dose. EFPI sensors were spectrally interrogated using a broadband probe source operating in the 830 nm wavelength region. While these single-point sensors failed early in the test, important additional fiber spectral transmission data was collected, which indicates that interrogation of EFPI sensors in alternate wavelength regions may allow significant improvement in sensor longevity for operation in high-radiation environments. This work was funded through a Small Business Innovative Research (SBIR) contract with the Nasa Glenn Research Center. (authors)« less
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  • Three topics are covered: Electric Field Measurement, Fiber Optic Temperature Sensing, and Optical Power Transfer. Work was done on the measurement of ac and dc electric fields. A prototype sensor for measuring alternating fields was made using a very simple electroscope approach. An electronic field mill sensor for dc fields was made using a fiber optic readout, so that the entire probe could be operated isolated from ground. There are several instances in which more precise knowledge of the temperature of electrical power apparatus would be useful. This report describes a number of methods whereby the distributed temperature profile canmore » be obtained using a fiber optic sensor. The ability to energize electronics by means of an optical fiber has the advantage that electrical isolation is maintained at low cost. In order to accomplish this, it is necessary to convert the light energy into electrical form by means of photovoltaic cells. JPL has developed an array of PV cells in gallium arsenide specifically for this purpose. This work is described.« less