R&D Category: -Failure detection
9 documents found
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Documentation of the SILOE experiments results (Experiment S2) Dokumentation der SILOE Ergebnisse (Versuch S2)
Glauner, W.;Plitz, HKernforschungszentrum Karlsruhe GmbH (Germany)
KFK-PSB--1210 - German - 1977
Abstract: The performance during operation of a defective sodium cooled oxide fuel rod is to be determined. For this purpose, oxide fuel rods are provided with an artificial defect in a series of tests and operated for about two months each in a sodium loop of the SILOE reactor in Grenoble. The data and mode of LMFBR operating conditions, implying partial load and full load as well as the typically slow power cyclings. That means, that LOF and TOP behavior are not investigated. Three objectives were pursued in these tests: 1. Investigation into the behaviour of the defective fuel rod power, especially questions related to defect growth. 2. Development and verification of measuring methods allowing to detect defects. 3. Determination of fuel and fission gas release from the rod and their distribution and deposition in sodium systems. The first test (S2) was performed in 1976 with a fresh fuel rod. The results obtained on the three topics indicated above are reported
Key words: coolant loops;failed element detection;fission product release;fuel element failure;international cooperation;knk-2 reactor;reactor safety experiments;siloe reactor
Components Category: --Fuel pins
display the document: 34086307.pdf
Detection of the first fuel pin failure in KNK II Detektion des ersten defekten Brennstabs in der KNK II
Hoffmann, G.;Jacobi, S.;Jonatzke, O.;Letz, K.D.;Schmitz, GKernforschungszentrum Karlsruhe GmbH (Germany)
KFK-PSB--01.02.17P22A - German - 1979
Abstract: This report describes the detection of the first failed fuel pin in KNK II on April 1st, 1979. The DND signals of the background of both DND monitors installed near the main sodium pipes are compared with the signals after the beginning of the failure. The free fuel surface was estimated at about 1 mm''2 from the signal amplitudes. Immediately after the beginning of the failure the online-gamma-spectrometer started a special measurement, this spectrum is also compared with the background spectrum
Key words: defects;delayed neutron analysis;failed element detection;fuel element failure;fuel pins;gamma spectroscopy;knk-2 reactor;neutron detection;on-line control systems;reactor safety
Components Category: --Fuel pins
display the document: 34086280.pdf
On-line gamma spectroscopy measuring station for cover gas monitoring at KNK II
Hoffmann, G.;Letz, K.DKernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Inst. fuer Reaktorentwicklung;Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Projekt Schneller Brueter
KFK--2797 - English - 1980
Abstract: An automated Ge-
Key words: automation;cover gas;failed element monitors;fuel cans;gamma spectrometers;ge semiconductor detectors;knk-2 reactor
Components Category: -Coolant, cover-gas and Primary cooling system including heat exchangers
display the document: 11536175.pdf
Fuel element failure detection experiments, evaluation of the experiments at KNK II/1 (Intermediate Report) Brennelement-Schadensnachweisversuche, Auswertung der Versuche von KNK II/1 (Zwischenbericht)
Bruetsch, DaukINTERATOM GmbH, Bergisch-Gladbach (Germany)
IA-ITB--61.03068.7 - German - 1983
Abstract: In the frame of the fuel element failure detection experiments at KNK II with its first core the measurement devices of INTERATOM were taken into operation in August 1981 and were in operation almost continuously. Since the start-up until the end of the first KNK II core operation plugs with different fuel test areas were inserted in order to test the efficiency of the different measuring devices. The experimental results determined during this test phase and the gained experiences are described in this report and valuated. All three measuring techniques (Xenon adsorption line XAS, gas-chromatograph GC and precipitator PIT) could fulfil the expectations concerning their susceptibility. For XAS and GC the nuclide specific sensitivities as determined during the preliminary tests could be confirmed. For PIT the influences of different parameters on the signal yield could be determined. The sensitivity of the device could not be measured due to a missing reference measuring point
Key words: adsorption;electrostatic precipitators;failed element detection;gas chromatography;knk-2 reactor;measuring instruments;sensitivity;xenon
Components Category: --Fuel assemblies
display the document: 34087416.pdf
Description of the global fuel element failure detection for SNR 300 Beschreibung des globalen BE-Schadensnachweises fuer den SNR 300
Dauk, JINTERATOM GmbH, Bergisch-Gladbach (Germany)
IA--61.03915.9 - German - 1985
Abstract: For the detection of fission products in the cover gas of SNR 300 a high-resolution gamma-spectrometer with connected mini-computer is applied. The mechanical structure of the two Ge-detectors, which are positioned at two redundant gas lines, the analogous electronic and the structure of the computer with its periphery are described in this report. The concept of the software is presented, which had been developed especially for SNR 300. The start-up of the system and the calibration of the auxiliary measuring points and of the Ge-detectors are described
Key words: analog computers;cover gas;electronic equipment;failed element detection;fuel element failure;gamma spectroscopy;ge semiconductor detectors;knk-2 reactor;reactor control systems;reactor monitoring systems;reactor safety;snr reactor
Components Category: --Fuel assemblies
display the document: 34087388.pdf
Prelocation of the defective fuel assembly via the determination of the Xe131/Xe134 ratio in the primary cover gas during the third fuel assembly failure of KNK II/2 Vorlokalisierung des defekten Brennelementes ueber die Bestimmung der Isotopenverhaeltnisse 131Xe/134Xe im Primaerschutzgas waehrend des dritten Brennelementschadens KNK II/2
Stade, SchroeterKernkraftwerk-Betriebsgesellschaft mbH (Germany)
INIS-DE-KBG--016 - German - 1986
Abstract: After the restart of the KNK II reactor in March 1986 following the replacement of a defective fuel assembly, an increased DND-signal and increased fission gas activity in the primary cover gas were observed. Comparisons with a previous small failure (a so-called leaker) indicated the existence of another leaker. During the following months several fission gas burst were observed, and in regular intervals gas probes were taken from the cover gas. This allowed the measurement of the yields of the isotopes Xe131 and Xe134, the ratio of which is different for U235 and Pu239 fission. A comparison of measured and calculated ratios could therefore allow to distinguish between a failure in the Uranium fuel of the driver zone assemblies and the Uranium/Plutonium fuel of the test zone assemblies. The average value of 10 measurements was 0.40
Key words: delayed neutron analysis;failed element detection;fission products;fuel element failure;isotope ratio;knk-2 reactor;neutron detection;neutron flux tilting;plutonium 239;reactor operation;reactor safety;uranium 235;xenon 131;xenon 134
Components Category: --Fuel assemblies
display the document: 34087485.pdf
Comparative study of various methods of cover gas monitoring at KNK II Vergleichende Studie verschiedener Methoden zur Schutzgas-Ueberwachung von KNK II
Hossein, H.SKernforschungszentrum Karlsruhe GmbH (Germany)
KFK-PSB--01.02.17P56A - German - 1987
Abstract: The cover gas monitoring systems in KNK II described in this paper are based on the measurement of fission gases in the primary cover gas. After an introduction, the various components of the cover gas monitoring system are described, including the cover gas control system, the grab sampling system and the experimental failed fuel detection system. Later, some operational results of the cover gas control system and failed fuel detection system are presented and discussed. At the end as a conclusion the main advantages and disadvantages of each system are mentioned
Key words: cover gas;failed element detection;fission products;knk-2 reactor;monitoring;reactor safety
Components Category: -Coolant, cover-gas and Primary cooling system including heat exchangers
display the document: 34086285.pdf
Computer program Schieflast Rechenprogramm Schieflast
Timm, WINTERATOM GmbH, Bergisch Gladbach (Germany)
IA--54.07594.3 - German - 1988
Abstract: For the analysis of flux-tilting experiments for the detection of defective fuel assemblies in KNK II the computer program SCHIEF has been developed. It analyses the flux-tilting campaigns only on the basis of measured delayed neutron signal changes and the control rod bank position of the reference state. All other dates, such as absorber position and local power changes for the different flux-tilting campaigns, are calculated code-internally. Hereby, neutron physics data of three-dimensional calculations are used. With the help of SCHIEF all flux-tilting campaigns performed during the KNK II/2 operation have been analysed supplementarily. For each flux-tilting campaign three to four suspicious fuel assembly positions with defects were found, whereby the previous evaluation procedures were confirmed essentially. The flux-tilting campaign at 403 equivalent full-power days remains unclear, since there is no indication in the analysis on the defect on position 203. An analysis with the assumption of two defects does not provide reliable hints on possible positions of the defects
Key words: computer program documentation;control elements;delayed neutrons;failed element detection;knk-2 reactor;mathematical models;neutron flux tilting;s codes
Components Category: -Core components
display the document: 34087383.pdf
Calculation of DND-signals in case of fuel pin failures in KNK II with the computer code FICTION III Berechnung der DND-Signale beim Auftreten von Brennstabdefekten in der KNK II mit dem Rechencode FICTION III
Schmuck, IKernforschungszentrum Karlsruhe GmbH (Germany)
PSB--18.01.06P01B - German - 1990
Abstract: In KNK II two delayed neutron detectors are installed for quick detection of fuel subassembly cladding failures. They record the release of the precursors of the emitters of delayed neutrons into the sodium. The computer code FICTION III calculates the expected delayed neutron signals for certain fuel pin failures, where the user has to set the boundary conditions interactively. In view of FICTION II the advancement of FICTION III consists of the following items: application of the data sets of 105 isotopes, distinction of thermal and fast neutron induced fission, partitioning of the sodium flow into two circuits, consideration of the specific fission rates in 10 fuel pin sections, elaboration of the user's interaction possibilities for input/ output. The capability of FICTION III is shown by means of two applications (UNi-test pin on position 100 and the third KNK fuel subassembly cladding failure). Object of further evaluations will be among other things the analysis of increased delayed neutron signals in regard to the fault location and dimension
Key words: computer program documentation;delayed neutrons;f codes;failed element detection;fuel assemblies;fuel element failure;knk-2 reactor;monitoring;neutron detection;reactor safety
Components Category: -Core components
display the document: 34086372.pdf