Pub Date : 1995-10-21DOI: 10.1109/NSSMIC.1995.504256
R. Novotny, W. Doring, V. Hejny, M. Kotulla, B. Krusche, V. Metag, M. Nold, H. Stroher, M. Wolf
BaF/sub 2/ has become a very versatile scintillator for particle and photon detection commonly applied in medium and high energy physics experiments. The intrinsic properties allow particle identification via time-of-flight, /spl Delta/E-E and pulse-shape techniques. A new NE102A-BaF/sub 2/ phoswich detector using the standard TAPS crystals has been tested at relativistic energies. The drastically improved particle identification and first results obtained with a large annular forward wall consisting of 120 phoswich modules with 15 mm NE102A attached to the BaF/sub 2/-crystal will be discussed in detail.
BaF/ sub2 /已成为一种用途广泛的粒子和光子探测闪烁体，广泛应用于中高能物理实验中。其固有特性允许通过飞行时间、/spl Delta/E-E和脉冲形状技术来识别粒子。利用标准的TAPS晶体，在相对论能量下测试了一种新的NE102A-BaF/sub - 2/光子探测器。将详细讨论由120个光敏模块和15 mm NE102A连接到BaF/ sub2 /-晶体上的大型环形前壁组成的大大改进的颗粒识别和首次结果。
{"title":"A plastic-BaF/sub 2/ phoswich telescope for charged/neutral particle and photon detection","authors":"R. Novotny, W. Doring, V. Hejny, M. Kotulla, B. Krusche, V. Metag, M. Nold, H. Stroher, M. Wolf","doi":"10.1109/NSSMIC.1995.504256","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.504256","url":null,"abstract":"BaF/sub 2/ has become a very versatile scintillator for particle and photon detection commonly applied in medium and high energy physics experiments. The intrinsic properties allow particle identification via time-of-flight, /spl Delta/E-E and pulse-shape techniques. A new NE102A-BaF/sub 2/ phoswich detector using the standard TAPS crystals has been tested at relativistic energies. The drastically improved particle identification and first results obtained with a large annular forward wall consisting of 120 phoswich modules with 15 mm NE102A attached to the BaF/sub 2/-crystal will be discussed in detail.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125995649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-10-21DOI: 10.1109/NSSMIC.1995.504230
S. Frank, M. Ericson, M. L. Simpson, D. Hutchinson, R. Todd
A CMOS integrated circuit (IC) for pulse-shape discrimination (PSD) has been developed. The IC performs discrimination of gamma-rays and neutrons as part of a monitoring system for stored nuclear materials. The method extracts the pulse tail decay time constant using a leading edge trigger for identifying the start of the pulse and a zero-crossing discriminator to determine the zero crossing of the bipolar shaped signal. The circuit is designed to interface with two photomultiplier tubes-one for pulse processing and one for coincidence detection. Two outputs from the IC, a start and stop, can be used with a high speed timing system for pulse characterization with minimal external control. The circuit was fabricated in Orbit 1.2 /spl mu/m CMOS and operates from a 5-V supply. Specifics of the design including overall topology, charge-sensitive preamplifier and discriminator characteristics, shaping method and time constant selections, system timing, and implementation are discussed. Circuit performance is presented including timing walk, system dead time, and power consumption.
{"title":"A CMOS integrated circuit for pulse-shape discrimination","authors":"S. Frank, M. Ericson, M. L. Simpson, D. Hutchinson, R. Todd","doi":"10.1109/NSSMIC.1995.504230","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.504230","url":null,"abstract":"A CMOS integrated circuit (IC) for pulse-shape discrimination (PSD) has been developed. The IC performs discrimination of gamma-rays and neutrons as part of a monitoring system for stored nuclear materials. The method extracts the pulse tail decay time constant using a leading edge trigger for identifying the start of the pulse and a zero-crossing discriminator to determine the zero crossing of the bipolar shaped signal. The circuit is designed to interface with two photomultiplier tubes-one for pulse processing and one for coincidence detection. Two outputs from the IC, a start and stop, can be used with a high speed timing system for pulse characterization with minimal external control. The circuit was fabricated in Orbit 1.2 /spl mu/m CMOS and operates from a 5-V supply. Specifics of the design including overall topology, charge-sensitive preamplifier and discriminator characteristics, shaping method and time constant selections, system timing, and implementation are discussed. Circuit performance is presented including timing walk, system dead time, and power consumption.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129900430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-10-21DOI: 10.1109/NSSMIC.1995.500312
Y. H. Liu, A. Sinusas, F. Wackers
The authors present a new automated method for SPECT quantification and display, and its validation using computer simulations. The computer simulations provide validation for calculating myocardial defect severity. The short axial slices of the phantoms were divided into four walls (Anterior, Septal, Inferior and Lateral). Simulated myocardial defects with various degrees of severity were created in each wall from apical to basal slices. Twenty-nine computerized phantoms each with twelve SPECT short axial slices were quantified and analyzed using the Yale-CQ (Yale Circumferential Quantification) software. Two dimensional (2D) and three dimensional (3D) quantitative profiles and defect scores from the simulated short axial slices were obtained. The calculated defect score correlated highly with simulated defect severity (R=0.99 both in 2D and 3D). Thus, the quantitative defect score generated with the authors' SPECT quantification algorithm can be used as a reliable index for detecting severity of myocardial perfusion defect.
{"title":"Validation of a new SPECT quantification method using computer simulation","authors":"Y. H. Liu, A. Sinusas, F. Wackers","doi":"10.1109/NSSMIC.1995.500312","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.500312","url":null,"abstract":"The authors present a new automated method for SPECT quantification and display, and its validation using computer simulations. The computer simulations provide validation for calculating myocardial defect severity. The short axial slices of the phantoms were divided into four walls (Anterior, Septal, Inferior and Lateral). Simulated myocardial defects with various degrees of severity were created in each wall from apical to basal slices. Twenty-nine computerized phantoms each with twelve SPECT short axial slices were quantified and analyzed using the Yale-CQ (Yale Circumferential Quantification) software. Two dimensional (2D) and three dimensional (3D) quantitative profiles and defect scores from the simulated short axial slices were obtained. The calculated defect score correlated highly with simulated defect severity (R=0.99 both in 2D and 3D). Thus, the quantitative defect score generated with the authors' SPECT quantification algorithm can be used as a reliable index for detecting severity of myocardial perfusion defect.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128308788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-10-21DOI: 10.1109/NSSMIC.1995.504249
Filippo Nava, M. Alietti, Claudio Canali, Anna Cavallini, C. Papa, Valerio Re, C. Lanzieri
The non complete charge collection efficiency observed in Semi-Insulating (SI) Gallium Arsenide (GaAs) particle detectors has been generally attributed to trapping effects. However most of the detectors analyzed in literature can only operate below the depletion voltage. We present a careful analysis of the output signal and of performances of SI GaAs detectors, operated below and above full depletion and irradiated with /sup 241/Am /spl alpha/ particles. When the detector is biased below full depletion the output signals are affected by the undepleted part of the detector itself, while, when the detector is operated above the full depletion, the output signals are only affected by trapping-detrapping of charge carriers. Trapping-detrapping effects are in agreement with the analysis of deep levels present in the detectors. An energy resolution of 1.1% has been achieved with an /sup 241/Am /spl alpha/ source.
{"title":"Performances of SI GaAs detectors fabricated with a new technology","authors":"Filippo Nava, M. Alietti, Claudio Canali, Anna Cavallini, C. Papa, Valerio Re, C. Lanzieri","doi":"10.1109/NSSMIC.1995.504249","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.504249","url":null,"abstract":"The non complete charge collection efficiency observed in Semi-Insulating (SI) Gallium Arsenide (GaAs) particle detectors has been generally attributed to trapping effects. However most of the detectors analyzed in literature can only operate below the depletion voltage. We present a careful analysis of the output signal and of performances of SI GaAs detectors, operated below and above full depletion and irradiated with /sup 241/Am /spl alpha/ particles. When the detector is biased below full depletion the output signals are affected by the undepleted part of the detector itself, while, when the detector is operated above the full depletion, the output signals are only affected by trapping-detrapping of charge carriers. Trapping-detrapping effects are in agreement with the analysis of deep levels present in the detectors. An energy resolution of 1.1% has been achieved with an /sup 241/Am /spl alpha/ source.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128402288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-10-21DOI: 10.1109/NSSMIC.1995.510457
C. Riddell, A. Savi, M. Gilardi, F. Fazio
A least squares technique for reconstructing truncated data is presented when no a priori information is considered. It is applied to transmission SPECT data. The method consists in including the ramp filter into the conjugate gradient to speed convergence. The sinogram is extrapolated with zeros for filtering but extrapolated values are not considered during backward and forward projections. The first iteration presents artefacts that are corrected as soon as the second iteration. Tikhonov method is used to guarantee a unique solution and stabilize the reconstruction process. The resulting images are biased but this bias is recovered inside the field of view by a simple scaling process. The algorithm is fast and easy to regularize.
{"title":"Fast reconstruction of truncated transmission SPECT data","authors":"C. Riddell, A. Savi, M. Gilardi, F. Fazio","doi":"10.1109/NSSMIC.1995.510457","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.510457","url":null,"abstract":"A least squares technique for reconstructing truncated data is presented when no a priori information is considered. It is applied to transmission SPECT data. The method consists in including the ramp filter into the conjugate gradient to speed convergence. The sinogram is extrapolated with zeros for filtering but extrapolated values are not considered during backward and forward projections. The first iteration presents artefacts that are corrected as soon as the second iteration. Tikhonov method is used to guarantee a unique solution and stabilize the reconstruction process. The resulting images are biased but this bias is recovered inside the field of view by a simple scaling process. The algorithm is fast and easy to regularize.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127192026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-10-21DOI: 10.1109/NSSMIC.1995.504225
D. Gingrich, J. Hewlett, L. Holm, J. Pinfold
One approach to the front-end readout of the ATLAS liquid argon calorimeter is to store data locally in analog pipeline memories at the LHC beam-crossing frequency of 40 MHz. Proto-type pipeline chips using switched capacitor arrays which meet the ATLAS readout requirements exist. These new chips are capable of simultaneous read and write operations, and allow random access to storage locations. To utilize these essential design features requires a substantial amount of fast control and address bookkeeping logic. We have designed a controller capable of operating the pipelines as analog random access memories and that satisfies the ATLAS readout requirements. The pipeline controller manages the data of 256 time samples and provides dead-time free operation up to a trigger rate of 100 kHz, when reading out five time samples per event. This operation allows 2 /spl mu/s for the output reconstruction amplifiers to settle and should be sufficient to achieve the required 13-bit resolution. We are currently proto-typing a second PC-board version of our controller. The implementation of an integrated version based on the same design is in progress.
{"title":"A pipeline controller for the ATLAS calorimeter","authors":"D. Gingrich, J. Hewlett, L. Holm, J. Pinfold","doi":"10.1109/NSSMIC.1995.504225","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.504225","url":null,"abstract":"One approach to the front-end readout of the ATLAS liquid argon calorimeter is to store data locally in analog pipeline memories at the LHC beam-crossing frequency of 40 MHz. Proto-type pipeline chips using switched capacitor arrays which meet the ATLAS readout requirements exist. These new chips are capable of simultaneous read and write operations, and allow random access to storage locations. To utilize these essential design features requires a substantial amount of fast control and address bookkeeping logic. We have designed a controller capable of operating the pipelines as analog random access memories and that satisfies the ATLAS readout requirements. The pipeline controller manages the data of 256 time samples and provides dead-time free operation up to a trigger rate of 100 kHz, when reading out five time samples per event. This operation allows 2 /spl mu/s for the output reconstruction amplifiers to settle and should be sufficient to achieve the required 13-bit resolution. We are currently proto-typing a second PC-board version of our controller. The implementation of an integrated version based on the same design is in progress.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127324668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-10-21DOI: 10.1109/NSSMIC.1995.504319
R. Wheadon, G. Tonelli, P. Verdini, R. Dell'Orso, G. Bagliesi, C. Vannini, G. Hall
Double-sided silicon detector prototypes produced for the CMS inner tracker are described which divide the n-side into pads rather than strips. The signal routing to the readout electronics is made on a separate flexible z-print which is glued on the detector and then wire-bonded to the pads.
{"title":"Double-sided silicon detectors using n-side pad readout for the CMS silicon inner tracker","authors":"R. Wheadon, G. Tonelli, P. Verdini, R. Dell'Orso, G. Bagliesi, C. Vannini, G. Hall","doi":"10.1109/NSSMIC.1995.504319","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.504319","url":null,"abstract":"Double-sided silicon detector prototypes produced for the CMS inner tracker are described which divide the n-side into pads rather than strips. The signal routing to the readout electronics is made on a separate flexible z-print which is glued on the detector and then wire-bonded to the pads.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130079758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-10-21DOI: 10.1109/NSSMIC.1995.500274
R. Trébossen, B. Bendriem, A. Fontaine, R. Rougetet, V. Frouin, P. Remy
This work compares the results of clinical studies (a H/sub 2//sup 15/O study with three stimulations, 2 measurements of the [/sup 18/F]fluorodopa uptake in the striata and a cerebral [/sup 18/F]FDG study) acquired on an ECAT 953B in the 3D mode without and with the estimation of true method (ETM) for scatter correction. Results obtained in 3D have been compared to those measured in 2D mode for the same volunteers. The results of the H/sub 2//sup 15/O study performed on one subject with a single activation, show that, with the ETM correction, higher activation signal are measured in 3D than in 2D. For dynamic studies such as [/sup 18/F]Fluorodopa measurements, the ETM allows one to recover quantitative values of the tracer uptake comparable to those obtained in 2D. The measure of the [/sup 18/F]FDG metabolism rate in 3D addresses the problem of an absolute image calibration.
{"title":"Quantitation of clinical 3D PET studies with the ETM scatter correction","authors":"R. Trébossen, B. Bendriem, A. Fontaine, R. Rougetet, V. Frouin, P. Remy","doi":"10.1109/NSSMIC.1995.500274","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.500274","url":null,"abstract":"This work compares the results of clinical studies (a H/sub 2//sup 15/O study with three stimulations, 2 measurements of the [/sup 18/F]fluorodopa uptake in the striata and a cerebral [/sup 18/F]FDG study) acquired on an ECAT 953B in the 3D mode without and with the estimation of true method (ETM) for scatter correction. Results obtained in 3D have been compared to those measured in 2D mode for the same volunteers. The results of the H/sub 2//sup 15/O study performed on one subject with a single activation, show that, with the ETM correction, higher activation signal are measured in 3D than in 2D. For dynamic studies such as [/sup 18/F]Fluorodopa measurements, the ETM allows one to recover quantitative values of the tracer uptake comparable to those obtained in 2D. The measure of the [/sup 18/F]FDG metabolism rate in 3D addresses the problem of an absolute image calibration.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128977831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-10-21DOI: 10.1109/NSSMIC.1995.504268
W. Blum, H. Kroha, P. Widmann
Modern large-area precision tracking detectors require increasing accuracy for the alignment of their components. A novel multi-point laser alignment system has been developed for such applications, in particular for the muon spectrometer of the ATLAS detector at the Large Hadron Collider. The position of the detector components is monitored with respect to reference laser beams with semitransparent optical position sensors at multiple consecutive stations. The custom designed sensors work on the principle of silicon strip photodiodes. Two types of transparent strip sensors, based on crystalline and on amorphous silicon as active material, have been studied. The sensors provide two-dimensional position measurement with order 1 /spl mu/m resolution uniformly over a wide measurement range of several centimeters. Transmission rates above 90% have been achieved at selected wavelengths produced by laser diodes. This allows to position more than 10 sensors along one laser beam. Custom designed integrated readout electronics is being developed for the sensor systems.
{"title":"A novel laser alignment system for tracking detectors using transparent silicon strip sensors","authors":"W. Blum, H. Kroha, P. Widmann","doi":"10.1109/NSSMIC.1995.504268","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.504268","url":null,"abstract":"Modern large-area precision tracking detectors require increasing accuracy for the alignment of their components. A novel multi-point laser alignment system has been developed for such applications, in particular for the muon spectrometer of the ATLAS detector at the Large Hadron Collider. The position of the detector components is monitored with respect to reference laser beams with semitransparent optical position sensors at multiple consecutive stations. The custom designed sensors work on the principle of silicon strip photodiodes. Two types of transparent strip sensors, based on crystalline and on amorphous silicon as active material, have been studied. The sensors provide two-dimensional position measurement with order 1 /spl mu/m resolution uniformly over a wide measurement range of several centimeters. Transmission rates above 90% have been achieved at selected wavelengths produced by laser diodes. This allows to position more than 10 sensors along one laser beam. Custom designed integrated readout electronics is being developed for the sensor systems.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122367425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-10-21DOI: 10.1109/NSSMIC.1995.510415
Y. Ishii, M. Nakabaru, S. Utena
A transient mitigation method for feedwater system failure in the ABWR has been developed using a symptom method which detects system failures based on the trends of the plant parameter changes. This concept was derived from a correlation between the trends of the main plant parameters when a transient event occurs. Based on simulation results and the plant dynamics model, the trends of the main plant parameters confirm that the occurrence of a feedwater now changing event can be distinguished from other types of transient events. The transient detection logic and threshold are developed to be able to detect the transient event early in an abnormal event. This system detects the failure of the feedwater system based on the changes of the plant parameters, and it uses counter control to avoid a scram event caused by the low-water-level scram interlock logic. With early detection the plant power can be kept as high as possible corresponding to the remained water feeding ability. Based on the simulation results, the transient mitigation system was confirmed able to detect the transient event and avoid the plant scram in the case of the feedwater system failure. Furthermore it can distinguish the type of transient event and does not initiate any counter control in other types of transient events.
{"title":"Development of a symptom-based transient mitigation method for feedwater system failure in the ABWR plant","authors":"Y. Ishii, M. Nakabaru, S. Utena","doi":"10.1109/NSSMIC.1995.510415","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.510415","url":null,"abstract":"A transient mitigation method for feedwater system failure in the ABWR has been developed using a symptom method which detects system failures based on the trends of the plant parameter changes. This concept was derived from a correlation between the trends of the main plant parameters when a transient event occurs. Based on simulation results and the plant dynamics model, the trends of the main plant parameters confirm that the occurrence of a feedwater now changing event can be distinguished from other types of transient events. The transient detection logic and threshold are developed to be able to detect the transient event early in an abnormal event. This system detects the failure of the feedwater system based on the changes of the plant parameters, and it uses counter control to avoid a scram event caused by the low-water-level scram interlock logic. With early detection the plant power can be kept as high as possible corresponding to the remained water feeding ability. Based on the simulation results, the transient mitigation system was confirmed able to detect the transient event and avoid the plant scram in the case of the feedwater system failure. Furthermore it can distinguish the type of transient event and does not initiate any counter control in other types of transient events.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131070859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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