Operational and economical experience with vibration and loose parts monitoring systems on primary circuits of PWRS

Michel, Bieth; Puyal, C.

doi:10.1016/0149-1970(88)90065-0

Cited by 9 publications

(3 citation statements)

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“…Most of the world's PWRs are equipped with an LPMS (IAEA 2008, Olma 2003, Michel and Puyal 1988. In the United States, the NRC regulates LPMS design and use pursuant to Regulatory Guide 1.133, which states, "An inservice loose-part detection program should be implemented for the primary system of light-water cooled reactors during preoperational testing and the startup and power operation mode…."…”

Section: Figure Pagementioning

confidence: 99%

Export Control Guide: Loose Parts Monitoring Systems for Nuclear Power Plants

Langenberg

2012

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Section: Figure Pagementioning

confidence: 99%

Export Control Guide: Loose Parts Monitoring Systems for Nuclear Power Plants

Langenberg

2012

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“…German KTA [2] and European standard [3] also request the use of LPMS. Consequently, one can find LPMS on each French PWRs [4], on most of German PWRs [5], as well as on many other PWRs in Europe. The biggest problem of recent LPMS systems was the high missed alarm and false alarm rate.…”

Section: Introductionmentioning

confidence: 99%

“…Developers tried to improve the situation, introducing different methods based on observations of the signatures of the signals measured in practice. In France, the crest factor is widely used [4], in some other countries different threshold levels for amplitudes and rms. values are combined.…”

Section: Introductionmentioning

confidence: 99%

Advanced acoustic detection system for monitoring nuclear power plant components

Por¹

2016

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An acoustic event detection system is presented, which was installed at all four Units of Paks Nuclear Power Plant in 2002, and since that it was modified several times to follow technical developments. It monitors the whole reactor coolant system including its components. The original aim of the system was to monitor and detect loose parts. Fortunately loose part occurs rather rarely, but several events have been registered since the beginning of its operation. Event detection is based on Sequential Probability Ratio Test (SPRT), which is the fastest method in the sense it requires the minimum number of samples to find the event. It is demonstrated, that SPRT can detect events buried in the background noise. Monitoring system is fully automated, collecting all abnormal occurrences, i.e. deviation from normal operation, deviation from usual background noises, etc. We also demonstrate the typical spectra of the operation of different components. During the 13 years of operation flow induced vibrations of motor operated valves were monitored continuously, movement of the control rod driving mechanism were registered. System automatically records the start of the main coolant pumps detecting small size loose parts named debris. Sensitivity is demonstrated with automated registration of the water flowing from the control rod bank during outage of the reactor.

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