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Heinicke, W.; Tischer, A.; Weber, W.J.
Gesellschaft fuer Reaktorsicherheit m.b.H. (GRS), Koeln (Germany, F.R.)1981
Gesellschaft fuer Reaktorsicherheit m.b.H. (GRS), Koeln (Germany, F.R.)1981
AbstractAbstract
[en] The report on hand includes the experiments on criticality published from 1975 till 1980. About 90 experiments with the most important related data are listed. They are capable of being called up, with the data base system KRITEXP, by 14 different descriptors or printed in any arrangement or order. This is the basis for a global or purposeful verification of the calculating method for criticality safety. The proof of reliability of the calculations for the criticality analysis are immediately relevant for the licencing procedure under atomic law for all plants of the nuclear fuel cycle where nuclear fuels are handled. Since no criticality experiments are being carried out in the Federal Republic of Germany, the data collection on hand will help to fill this gap with regard to the assessment of experiments carried out in other countries. (orig.)
[de]
Der vorliegende Bericht enthaelt die in den Jahre 1975 bis 1980 veroeffentlichten Kritikalitaetsexperimente. Die ca. 90 Experimente sind mit ihren wichtigsten Daten angegeben und koennen mit dem erstellten Datenbanksystem KRITEXP nach 14 verschiedenen Suchwoertern angewaehlt und in beliebiger Reihenfolge und Anordnung ausgedruckt werden. Damit ist eine Basis fuer eine umfassende oder gezielte Verifikation der Rechenmethodik auf dem Gebiet der Kritikalitaetssicherheit gegeben. Der Nachweis der Zuverlaessigkeit der rechnerischen Kritikalitaetsanalyse ist unmittelbar relevant fuer das atomrechtliche Genehmigungsverfahren aller Anlagen des nuklearen Brennstoffkreislaufs, in denen mit Kernbrennstoffen umgegangen wird. Da in der Bundesrepublik Deutschland keine Kritikalitaetsexperimente durchgefuehrt werden, leistet die vorliegende Datensammlung einen Beitrag, diese Luecke im Hinblick auf die Auswertung der Experimente aus dem Ausland zu schliessen. (orig.)Original Title
Kritikalitaetsexperimente der Jahre 1975 bis 1980
Primary Subject
Source
Nov 1981; 32 p; CONTRACT 82 052; Available from Gesellschaft fuer Reaktorsicherheit m.b.H. (GRS), Koeln (Germany, F.R.)
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Report
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AbstractAbstract
[en] The physics parameters of a bare sphere of metallic 237Np have been investigated. The calculations indicate that a chain reaction can be sustained with fast neutrons. The predicted critical radius is 8.86 cm, and the corresponding critical mass is 59.7 kg. Kinetic parameters such as the prompt neutron lifetime, l, the prompt neutron decay constant at delayed criticality, α/sub c/, and the effective delayed neutron fraction, β/sub eff/, were also calculated. With respect to the last quantity, the phenomenon of the so-called vanishing dollar in systems consisting of even-neutron nuclei is discussed. Some remarks concern the possible utilization of 237Np, which is produced in nuclear power reactors as a by-product
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Journal Article
Journal
Nuclear Science and Engineering; ISSN 0029-5639;
; v. 72(2); p. 272-276

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AbstractAbstract
[en] The critical mass of the reactor RP-0 of the Peruvian Institute of Nuclear Energy is determined by using the Fermi model of diffusion and age in connection with an experimental subcritical neutron population. A desk computer HP9825 is used with a program in HP4. The observed discrepancy between the calculated and the measured mass is 5%
Original Title
Determinacion de la masa critica de un reactor nuclear
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Journal Article
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Informe Nuclear; CODEN INNUE; v. 3(1); p. 36-41
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[en] The results of various conventional tests with this 1000kW experimental reactor (KSTR) are shown in diagrams. The comparatively high negative temperature coefficient of the reactivity was found to be a great advantage. Some inexplicable temperature differences and temperature changes in the reactor vessel were found. (J.S.)
Original Title
Experimenten met de KEMA suspensie test reactor tot vol vermogen
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Journal Article
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Atoomenergie en Haar Toepassingen; v. 17(11); p. 234-236
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AbstractAbstract
No abstract available
Original Title
Kritikalitaetssicherheit bei der Herstellung und Handhabung von Kernbrennstoffen
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Source
Mar 1975; 7 p; Beuth; Berlin, F.R. Germany; DIN--25403 BL. 6; 5 figs.; 2 tabs.
Record Type
Book
Literature Type
Standard
Country of publication
ACTINIDE COMPOUNDS, ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, DISPERSIONS, EVEN-ODD NUCLEI, FISSIONABLE MATERIALS, HEAVY NUCLEI, HYDROGEN COMPOUNDS, ISOTOPES, NITRATES, NITROGEN COMPOUNDS, NUCLEI, OXYGEN COMPOUNDS, PLUTONIUM COMPOUNDS, PLUTONIUM ISOTOPES, RADIOISOTOPES, SIZE, TRANSURANIUM COMPOUNDS, YEARS LIVING RADIOISOTOPES
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[en] Work accomplished in support of nonweapons programs by LASL Group Q-14 is described. Included are efforts in basic critical measurements, nuclear criticality safety, a plasma core critical assembly, and reactivity coefficient measurements
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Source
Kirk, W.L. (comp.); Marquette Univ., Milwaukee, Wis. (USA). Dept. of Chemistry; p. 72-79; May 1977; p. 72-79
Record Type
Report
Literature Type
Progress Report
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[en] Three-group diffusion theory has been applied to a computation of the 231Pa mass required to sustain a fast-neutron chain reaction. The method was tested by preliminary calculation of several 235U--238U systems and of a single 239Pu--238Pu system. The best agreement between predictions and measurements was found for high-enrichment 235U--238U systems. In the case of 231Pa, where many of the necessary data do not exist, use was made of the characteristics of 237Np as a substitute. The predicted critical radius for 231Pa is 22.67 +- 1.81 cm, and the corresponding critical mass is 750 +- 180 kg
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Secondary Subject
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Journal Article
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Nuclear Science and Engineering; v. 68(3); p. 349-351
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AbstractAbstract
No abstract available
Original Title
Kritikalitaetssicherheit bei der Herstellung und Handhabung von Kernbrennstoffen
Primary Subject
Source
Mar 1975; 7 p; Beuth; Berlin, F.R. Germany; DIN--25403 BL. 5; 5 figs.; 3 tabs.
Record Type
Book
Literature Type
Standard
Country of publication
ACTINIDE COMPOUNDS, ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, CHALCOGENIDES, DISPERSIONS, EVEN-ODD NUCLEI, FISSIONABLE MATERIALS, HEAVY NUCLEI, HYDROGEN COMPOUNDS, ISOTOPES, NUCLEI, OXIDES, OXYGEN COMPOUNDS, PLUTONIUM COMPOUNDS, PLUTONIUM ISOTOPES, PLUTONIUM OXIDES, RADIOISOTOPES, SIZE, TRANSURANIUM COMPOUNDS, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
[en] The preliminary results of development of a new heat transfer correlation for supercritical water flowing in vertical heated tubes have been reported. It has been shown through a comparison with experimental data that the suggested method of allowance for variations of water thermophysical properties near the critical point provides a satisfactory agreement of the predicted and experimental results
[ru]
Подведены предварительные итоги исследования, основной целью которого является получение нового уравнения для инженерных расчетов теплоотдачи от поверхности обогреваемых вертикальных труб при движении в них воды сверхкритического давления. Путем сравнения с большим массивом экспериментальных данных показано, что предлагаемый метод учета сильного изменения теплофизических свойств теплоносителя вблизи критической точки обеспечивает удовлетворительное согласование расчетных и экспериментальных результатовOriginal Title
Uchet peremennosti teplofizicheskikh svojstv teplonositelya v uravnenii teplootdachi k vynuzhdennomu potoku vody sverkhkriticheskogo davleniya
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Source
27 refs., 5 figs., 1 tab.
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Journal Article
Journal
Vestnik Natsional'nogo Issledovatel'skogo Yadernogo Universiteta MIFI; ISSN 2304-487X;
; v. 3(3); p. 353-361

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AbstractAbstract
No abstract available
Original Title
Temperaturnyj ehffekt v oblasti 20-2500C dlya nekotorykh strogo regulyarnykh geterogennykh U-H2O kriticheskikh sborok
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Journal Article
Journal
At. Energ. (USSR); v. 30(4); p. 354-358
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