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Production bias - a potential driving force for irradiation growth

R. A. Holt

出版	AECL Research., 1993
URL	http://books.google.com.hk/books?id=by5u0AEACAAJ&hl=&source=gbs_api

註釋

To steadily improve flow-noise-analysis techniques for determining more-reliable flow-transmitter response times, a laboratory water loop was used to determine the effects of impulse-line mismatch on differential-pressure (dp) cell response. the differential-pressure noise across an orifice in the water loop was monitored with a dp cell through a pair of 46 m-long impulse lines that connected the dp cell to the water loop. to facilitate transfer function determinations of these components, four high-fidelity pressure transducers were installed, two across the orifice plate and two at the ends of the impulse lines. their signals were recorded for various lengths of the impulse lines and different dp-cell types. these signals were analyzed in the frequency domain and the measured transfer functions were compared with model predictions. the results indicate that a pair of impulse lines, coupled with a rosemount dp cell can be reliably modeled in the frequency domain to upper frequencies as high as the fifth harmonic resonance of the impulse line. in contrast to this, the agreement between observed and predicted frequency response when a gould or bailey dp cell couple the high and low-impulse lines is poor. the model shortcomings are related to the significantly more complex hydrodynamic behaviour of gould and bailey dp cells. the favourable results obtained for the rosemount dp cell suggest that the inclusion of a transmission-line model in the flow-transmitter response-time analysis "curve-fit" algorithm would reduce both analysis subjectivity and sensitivity of the results on undesirable flow-signal anomalies that are found on some safety-system flow channels.