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Assessment of nonintrusive methods for monitoring the operational readiness of solenoid-operated valves

Description: Solenoid-operated valves (SOVs) are being studied at Oak Ridge National Laboratory as part of the USNRC Nuclear Plant Aging Research (NPAR) Program. The primary objective of the study is to identify and recommend methods for inspection, surveillance, and maintenance of SOVs that can ensure their operational readiness-- that is, their ability to perform required safety functions under all anticipated operating conditions. An earlier (Phase I) study described SOV failure modes and causes and iden… more
Date: January 1, 1988
Creator: Kryter, R. C.
Partner: UNT Libraries Government Documents Department
open access

Nonintrusive methods for monitoring the operational readiness of solenoid-operated valves

Description: Solenoid-operated valves (SOVs) are being studied at Oak Ridge National Laboratory as part of the USNRC Nuclear Plant Aging Research (NPAR) Program. The primary objective of the study is to identify, evaluate, and recommend methods for inspection, surveillance, monitoring, and maintenance of SOVs that can ensure their operational readiness--that is, their ability to perform required safety functions under all anticipated operating conditions. An earlier (Phase I) study described SOV failure mod… more
Date: January 1, 1989
Creator: Kryter, R.C.
Partner: UNT Libraries Government Documents Department
open access

Motor current signature analysis for determining operational readiness of motor-operated valves (MOVs)

Description: Motor current signature analysis (MCSA) is a novel diagnostic process for condition monitoring of electric-motor-driven mechanical equipment (e.g., pumps, motor-operated valves, compressors, and processing machinery). The MCSA process identifies, characterizes, and trends over time the instantaneous load variations of mechanical equipment in order to diagnose changes in the condition of the equipment (e.g., due to degradation or service wear), which, if allowed to continue, may lead to failure.… more
Date: January 1, 1987
Creator: Kryter, R. C. & Haynes, H. D.
Partner: UNT Libraries Government Documents Department
open access

Inferring PWR barrel motion from ex-core neutron detector signals

Description: Noise analysis of ex-core power range channel signals has been developed, through experimental and analytical efforts, to a point where it is recognized by PWR manufacturers and the Nuclear Regulatory Commission to provide a basis for nonperturbative inservice monitoring for excessive or altered mechanical motion of the reactor core support barrel which might be indicative of degraded structural integrity. Data recently acquired at two similar (sister) PWR plants and reported further confirm th… more
Date: January 1, 1976
Creator: Robinson, J. C. & Kryter, R. C.
Partner: UNT Libraries Government Documents Department
open access

Condition monitoring of machinery using motor current signature analysis

Description: Motor current signature analysis (MCSA) is a powerful monitoring tool for motor-driven equipment that provides a nonintrusive means for detecting the presence of mechanical and electrical abnormalities in the motor and the driven equipment, including altered conditions in the process ''downstream'' of the motor-driven equipment. It was developed at the Oak Ridge National Laboratory as a means for determining the effects of aging and service wear systems, but it is applicable to a broad range of… more
Date: January 1, 1989
Creator: Kryter, R. C. & Haynes, H. D.
Partner: UNT Libraries Government Documents Department
open access

Application of noise analysis to safety-related assessments and reactor diagnostics

Description: Noise analysis methods were used to assess anomalous in-core temperature fluctuations at the Fort St. Vrain gas-cooled reactor and postaccident reactor conditions at Three Mile Island, Unit 2. In addition to these applications of noise analysis, the underlying technology is developed concerning (1) analytical methods for predicting noise signatures under postulated anomalous conditions, (2) techniques for on-line monitoring of boiling water reactor stability, (3) new methods for locating and ch… more
Date: January 1, 1980
Creator: Kryter, R. C. & Fry, D. N.
Partner: UNT Libraries Government Documents Department
open access

U. S. experience with in-service monitoring of core barrel motion in PWRs using ex-core neutron detectors

Description: Coolant flow forces, pressure pulsations, and reactor primary system mechanical vibrations in a PWR combine to cause pendular (and other more complicated) motions of the reactor core support barrel within its surrounding pressure vessel. These motions are normally quite small (a few thousandths of an inch) and constitute no immediate safety problem, but in view of one past occurrence where some internal structural damage resulted, the U.S. Nuclear Regulatory Commission is considering making rou… more
Date: January 1, 1978
Creator: Kryter, R C; Robinson, J C & Thie, J A
Partner: UNT Libraries Government Documents Department
open access

Inference of core barrel motion from neutron noise spectral density. [PWR]

Description: A method was developed for inference of core barrel motion from the following statistical descriptors: cross-power spectral density, autopower spectral density, and amplitude probability density. To quantify the core barrel motion in a typical pressurized water reactor (PWR), a scale factor was calculated in both one- and two-dimensional geometries using forward, variational, and perturbation methods of discrete ordinates neutron transport. A procedure for selection of the proper frequency band… more
Date: March 15, 1977
Creator: Robinson, J. C.; Shahrokhi, F. & Kryter, R. C.
Partner: UNT Libraries Government Documents Department
open access

A nonintrusive method for measuring the operating temperature of a solenoid-operated valve

Description: Experimental data are presented to show that the in-service operating temperature of a solenoid-operated valve (SOV) can be interred simply and nondisruptively by using the copper winding of the solenoid coil as a self-indicating, permanently available resistance thermometer. The principal merits of this approach include (a) there is no need for an add-on temperature sensor, (b) the true temperature of a critical --- and likely the hottest --- part of the SOV (namely, the electrical coil) is me… more
Date: January 1, 1990
Creator: Kryter, R.C.
Partner: UNT Libraries Government Documents Department
open access

Loose-parts monitoring: present status of the technology, its implementation in U. S. reactors, and some recommendations for achieving improved performance

Description: An assessment of the technical development status of loose-parts monitoring systems (LPMS) and their performance record to data in commercial light-water-cooled nuclear reactor plants was made during the spring of 1977, using an on-site personal interview and equipment demonstration approach. The study revealed that while presently demonstrated LPMS technology does indeed provide a capability for detecting the presence of those relatively massive loose parts that would likely constitute a serio… more
Date: January 1, 1977
Creator: Kryter, R. C.; Ricker, C. W. & Jones, J. E.
Partner: UNT Libraries Government Documents Department
open access

On-site noise diagnostics at Palisades Nuclear Power Station

Description: From an applications symposium on power plant dynamics, control and testing; Knoxville, Tennessee, USA (8 Oct 1973). A real-time noise analyzer was used on-site at the Palisades nuclear plant to diagnose the cause of neutron flux oscillations. The analysis was compared with an earlier off-site analysis of tape recorded signals. The measurements and conclusions are described, and recommendations for application of on-site noise analysis in nuclear plants are presented. (HDR)
Date: January 1, 1973
Creator: Fry, D.N.; Kryter, R.C. & Robinson, J.C.
Partner: UNT Libraries Government Documents Department
open access

Experience with a digital noise analysis system in subcriticality measurements on a mockup of the FFTF

Description: From nuclear science symposium; San Francisco, California, USA (14 Nov 1973). A digital Fourier analyzer was programmed to perform reactor neutron noise analysis measurements and on-line processing of the data to obtain the steady-state reactivity. The system is suitable for recovering cross spectral density with low correlatedsignal component and for repetitive measurements with efficient use of reactor time. (auth)
Date: January 1, 1973
Creator: Pare, V.K.; Kryter, R. C. & Mihalczo, J. T.
Partner: UNT Libraries Government Documents Department
open access

Results in the application of pattern recognition methods to nuclear reactor core component surveillance

Description: From nuclear science symposium; San Francisco, California, USA (14 Nov 1973). Pattern recognition methods were applied to analyze and interpret neutron noise data from the High Flux Isotope Reactor (HFIR) at ORNL. The results show that it is feasible to detect some core component failures by means of machine- discernible differences in the time-dependent noise power spectra. These neutron spectra (signatures) were analyzed by using a clusterseeking algorithm to derive a set of templates for aut… more
Date: January 1, 1973
Creator: Gonzalez, R.C.; Fry, D.N. & Kryter, R.C.
Partner: UNT Libraries Government Documents Department
open access

Preliminary investigation of /sup 252/Cf-driven neutron noise analysis for subcritical fuel solution systems

Description: A method for determining the reactivity of highly subcritical systems of fissile material, using neutron-noise power spectral densities in conjunction with a /sup 252/Cf source, had previousy been tested in two fast reactor critical assemblies (a mockup of the Fast Flux Test Facility reactor and unreflected enriched uranium metal assemblies) and one thermal reactor (a light-water moderated and reflected lattice of Oak Ridge Research Reactor fuel elements). The last-mentioned test demonstrated t… more
Date: January 1, 1981
Creator: Mihalczo, J. T.; Kryter, R. C. & King, W. T.
Partner: UNT Libraries Government Documents Department
open access

Report of Foreign Travel of R. C. Kryter, October 1990

Description: The International Program Committee for SMORN VI met in Paris to organize the contributed technical papers into sessions and to appoint session chairmen. These objectives were accomplished without controversy. SMORN VI has the makings of successful venture, with 80 papers submitted by authors from 20 countries throughout Europe, Asia, and the Western Hemisphere. For the first time in this symposium series, papers were received from Cuba and the USSR
Date: November 1, 1990
Creator: Kryter, R. C.
Partner: UNT Libraries Government Documents Department
open access

Subcritical measurements using the /sup 252/Cf source-driven neutron noise analysis method

Description: This paper describes recent measurements of the subcritical neutron multiplication factor using the /sup 252/Cf source-driven neutron noise analysis method. This work was supported by a program of collaboration between the United States Department of Energy and the Power Reactor and Nuclear Fuel Development Corporation of Japan related to the development of fast breeder technology. The experiment reported consists of a configuration of two interacting tanks of uranyl nitrate aqueous solution wi… more
Date: January 1, 1985
Creator: Mihalczo, J.T.; Blakeman, E.D.; Ragan, G.E. & Kryter, R.C.
Partner: UNT Libraries Government Documents Department
open access

Noninvasive testing of solenoid-operated valves using transient current signature analysis

Description: A methodology has been developed for in situ diagnostic testing of dc-actuated solenoid-operated valves (SOVs) by analysis of the characteristics of the transient current waveform accompanying valve actuation. This waveform, which is used to identify abnormal operation, is obtained inductively by a small split-core current transformer clamped around one of the valve`s solenoid leads. The digitized waveforms are subsequently compared with similar waveforms obtained when the valve was known to be… more
Date: March 1, 1997
Creator: Blakeman, E.D. & Kryter, R.C.
Partner: UNT Libraries Government Documents Department
open access

Multivariate statistical pattern recognition system for reactor noise analysis

Description: A multivariate statistical pattern recognition system for reactor noise analysis was developed. The basis of the system is a transformation for decoupling correlated variables and algorithms for inferring probability density functions. The system is adaptable to a variety of statistical properties of the data, and it has learning, tracking, and updating capabilities. System design emphasizes control of the false-alarm rate. The ability of the system to learn normal patterns of reactor behavior … more
Date: January 1, 1975
Creator: Gonzalez, R. C.; Howington, L. C.; Sides, W. H. Jr. & Kryter, R. C.
Partner: UNT Libraries Government Documents Department
open access

Advances in automated noise data acquisition and noise source modeling for power reactors

Description: A newly expanded program, directed toward achieving a better appreciation of both the strengths and limitations of on-line, noise-based, long-term surveillance programs for nuclear reactors, is described. Initial results in the complementary experimental (acquisition and automated screening of noise signatures) and theoretical (stochastic modeling of likely noise sources) areas of investigation are given.
Date: January 1, 1981
Creator: Clapp, N. E., Jr.; Kryter, R. C.; Sweeney, F. J. & Renier, J. A.
Partner: UNT Libraries Government Documents Department
open access

Summary of ORNL investigation of in-core vibrations in BWR-4s

Description: This report describes the use of noise analysis to investigate in-core instrument tube vibrations in BWR-4 reactors. Neutron noise signals from in-core fission chambers and acoustic noise signals from externally mounted accelerometers were used in these studies. The results show that neutron noise can be used to detect vibration and, more importantly, impacting of instrument tubes against adjacent fuel channel boxes. Externally mounted accelerometers detect impacting but not rubbing of instrume… more
Date: March 25, 1977
Creator: Fry, D. N.; Kryter, R. C.; Mathis, M. V.; Mott, J. E. & Robinson, J. C.
Partner: UNT Libraries Government Documents Department
open access

/sup 252/Cf-source-driven neutron noise measurements of subcriticality for a slab tank containing aqueous Pu-U nitrate

Description: In order to study nuclear criticality safety related to the development of fast breeder technology, /sup 252/Cf-source-driven neutron noise analysis measurements were performed with a Pu-U nitrate solution in a slab tank of various heights and thickness varying 11.43 cm to 19.05 cm. The results and conclusions of these experiments are (1) a capability to measure the subcriticality of a multiplying system of slab geometry to a k/sub eff/ as low as 0.7 was demonstrated, (2) calculated neutron mul… more
Date: August 1, 1987
Creator: Mihalczo, J.T.; Blakeman, E.D.; Ragan, G.E.; Kryter, R.C.; Robinson, R.C. & Seino, H.
Partner: UNT Libraries Government Documents Department
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