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Evaluation of check valve monitoring methods

Abstract Check valves are used extensively in nuclear plant safety systems and balance-of-plant (BOP) systems. Their failures have resulted in significant maintenance efforts and, on occasion, have resulted in water hammer, overpressurization of low-pressure systems and damage to flow system components. Consequently, in recent years check valves have received considerable attention by the Nuclear Regulatory Commission (NRC) and the nuclear power industry. Oak Ridge National Laboratory (ORNL) is carrying out a comprehensive two phase aging assessment of check valves in support of the Nuclear Plant Aging Research (NPAR) program. As part of the second phase, ORNL is evaluating several developmental and/or commercially available check valve diagnostic monitoring methods; in particular, those based on measurements of acoustic emission, ultrasonics, and magnetic flux. These three methods were found to provide different (and complementary) diagnostic information. The combination of acoustic emission with either ultrasonic or magnetic flux monitoring yields a monitoring system that succeeds in providing sensitivity to detect all major check valve operating conditions. The three check valve monitoring methods described in this paper are still under development and are presently being tested as part of a program directed by the Nuclear Industry Check Valve Group (NIC) in conjunction with the Electric Power Research Institute (EPRI). Phase 1 of this program (water testing) is being carried out at the Utah Water Research Laboratory located on the Utah State University campus.
- Oak Ridge National Laboratory United States
- University of North Texas United States
- University of North Texas United States
- Oak Ridge National Laboratory United States
Aging, Design, Testing, Ultrasonic Testing, Magnetic Flux, Equipment, Research Programs, 220200 -- Nuclear Reactor Technology-- Components & Accessories, 220900 -- Nuclear Reactor Technology-- Reactor Safety, Technology Assessment, Materials Testing, Nondestructive Testing, 22 General Studies Of Nuclear Reactors, Reactor Safety, Acoustic Testing, Thermal Power Plants 220400* -- Nuclear Reactor Technology-- Control Systems, Leaks, Valves, Control Equipment, Flow Regulators, Nuclear Facilities, Nuclear Power Plants, Acoustic Emission Testing, Safety, Reactor Monitoring Systems, Power Plants
Aging, Design, Testing, Ultrasonic Testing, Magnetic Flux, Equipment, Research Programs, 220200 -- Nuclear Reactor Technology-- Components & Accessories, 220900 -- Nuclear Reactor Technology-- Reactor Safety, Technology Assessment, Materials Testing, Nondestructive Testing, 22 General Studies Of Nuclear Reactors, Reactor Safety, Acoustic Testing, Thermal Power Plants 220400* -- Nuclear Reactor Technology-- Control Systems, Leaks, Valves, Control Equipment, Flow Regulators, Nuclear Facilities, Nuclear Power Plants, Acoustic Emission Testing, Safety, Reactor Monitoring Systems, Power Plants
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