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Research Papers

Monitoring Pump Parameters in Small Modular Reactors Using Electric Motor Signatures1

[+] Author and Article Information
Belle R. Upadhyaya

Mem. ASME
Department of Nuclear Engineering,
University of Tennessee,
1004 Estabrook Road, Knoxville, TN 37996-2300
e-mail: bupadhya@utk.edu

Chaitanya Mehta

AECOM,
10 Patewood Drive, Bldg. VI, Suite 500, Greenville, SC 29615
e-mail: Chaitanya.Mehta@aecom.com

J. Wesley Hines

Department of Nuclear Engineering,
University of Tennessee,
1004 Estabrook Road, Knoxville, TN 37996-2300
e-mail: jhines2@utk.edu

Victor B. Lollar

Department of Nuclear Engineering,
University of Tennessee,
1004 Estabrook Road, Knoxville, TN 37996-2300
e-mail: vlollar@utk.edu

Duygu Bayram

Department of Electrical Engineering,
Istanbul Technical University,
Maslak, Istanbul 34469, Turkey
e-mail: bayramd@itu.edu.tr

1A version of this manuscript was published in the Proceedings of the ASME 2014 Small Modular Reactors Symposium, “Approaches to Process Monitoring in Small Modular Reactors,” Washington, DC, April 2014.

2Corresponding author.

Manuscript received July 31, 2015; final manuscript received August 4, 2016; published online December 20, 2016. Assoc. Editor: Masaki Morishita.

ASME J of Nuclear Rad Sci 3(1), 011007 (Dec 20, 2016) (7 pages) Paper No: NERS-15-1170; doi: 10.1115/1.4034477 History: Received July 31, 2015; Accepted August 04, 2016

Small modular nuclear reactors (SMRs) are designed for long-term operation with minimum outages and for possible deployment in remote locations. To achieve this operational goal, the SMRs may require remote and continuous monitoring of performance parameters that contribute to operation and maintenance. This feature is also important in monitoring critical parameters during severe accidents and for postaccident recovery. Small integral light water reactors have in-vessel space constraints, and many of the traditional instrumentation are not practical in these systems. To investigate this issue, analytical and experimental researches were carried out using a flow test loop to characterize the relationship among process variables (flow rate and pressure) and pump motor signatures. The findings of this research are presented, with implications in relating electrical signatures to pump parameters. The relationship between the electrical signatures and the process variables is discussed with reference to the experimental results. The results of this work may be used for monitoring process variables in small modular reactor systems.

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References

Figures

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Fig. 1

Schematic of the IRIS system [2]

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Fig. 2

Experimental flow control loop, showing vertical tanks, piping, motor-operated valves, and sensors [6]

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Fig. 3

Schematic of the experimental flow loop [6]

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Fig. 4

Motor electrical signature during pump operation and motor current–time [6]

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Fig. 5

Bypass flow rate for the condition similar to that in Fig. 4 [6]

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Fig. 6

Relationship between motor rms power and shaft frequency [6]

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Fig. 7

Relationship between motor rms power and pump discharge pressure [6]

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Fig. 8

Relationship between bypass flow rate and rms power with [6]

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Fig. 9

Loop flow rate as a function of motor rms power with bypass valve closed [6]

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Fig. 10

Loop pressure as a function of motor rms power with bypass valve closed [6]

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Fig. 11

Transient experiments showing flow rate (top) and motor power (bottom) [6]

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Fig. 12

Average values of pump flow rate as a function of average motor power, showing the uncertainty of flow rate (with respect to mean) at each test condition (motor frequency) [6]

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Fig. 13

Average values of pump discharge pressure as a function of motor power at each test condition (motor frequency) [6]

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