Abstract
In order to access the fretting damage of the steam generator tube (SGT), a fast fiber Fabry-Perot (F-P) non-scanning correlation demodulation system based on a super luminescent light emitting diode (SLED) was performed. By demodulating the light signal coming out from the F-P force sensor, the radial collision force between the SGT and the tube support plate (TSP) was interrogated. For higher demodulation accuracy, the effects of the center wavelength, bandwidth, and spectrum noise of SLED were discussed in detail. Specially, a piezoelectric ceramic transducer (PZT) modulation method was developed to get rid of the interference of mode coupling induced by different types of fiber optics in the demodulation system. The reflectivity of optical wedge and F-P sensor was optimized. Finally, the demodulation system worked well in a 1:1 steam generator test loop and successfully demodulated a force signal of 32 N with a collision time of 2 ms.
Highlights
The faults related to the steam generator tube (SGT) rupture accounts for 75% of all failure risks in pressurized water reactor nuclear power plants [1]
As the main cause of SGT rupture, fretting damage has been addressed as a worldwide problem in the safety of nuclear power plants for a long time [2,3,4,5,6]
The SGT is the boundary between the reactor cooling system and the secondary circuit and suffers from the fretting damage caused by fluid motion and thermal energy transmission (350 ◦ C, 15 MPa, humid)
Summary
The faults related to the steam generator tube (SGT) rupture accounts for 75% of all failure risks in pressurized water reactor nuclear power plants [1]. As for the high requirements of the radial collision with the advantages of small volume (17 × 5 × 3 mm3) and high performance in a humid, high force measurement, we have developed a novel optical Fabry-Perot (F-P) force sensor [8], with the pressure, and vibrating working environment. Due to the short impact time of radial collision force [6], the second question is obtain a long demodulation range of F-P cavity length variation (0–25 μm, a corresponding force of how to achieve a fast demodulation speed (above 5 KHz). Is capable of realizing method lacksismoving and anlarge expensive laser asmeasurement the light source, In this length paper, measurement targeting the questions mentioned above, we developed a novel fast fiber optical F-P large cavity [13]. Our system, with high performance, was proved on the 1:1 steam generator test loop (which simulated a real steam generator with the same geometry and system design)
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