On accuracy of the parameter of deep subcriticality determination by the Feynman method
This paper considers the application of the Feynman method of neutron noise analysis for determination of the deep subcriticality parameters for multiplying systems. In particular, it is shown that the selection of the width of the timeslots, for which the mean and variance of the number of the neut...
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| Format: | Article |
| Language: | English |
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Institute for Nuclear Research, National Academy of Sciences of Ukraine
2014-06-01
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| Series: | Âderna Fìzika ta Energetika |
| Subjects: | |
| Online Access: | http://jnpae.kinr.kiev.ua/15.2/Articles_PDF/jnpae-2014-15-0132-Pavlovych.pdf |
| _version_ | 1811253705746415616 |
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| author | V. M. Pavlovych O. V. Pidnebesnyy |
| author_facet | V. M. Pavlovych O. V. Pidnebesnyy |
| author_sort | V. M. Pavlovych |
| collection | DOAJ |
| description | This paper considers the application of the Feynman method of neutron noise analysis for determination of the deep subcriticality parameters for multiplying systems. In particular, it is shown that the selection of the width of the timeslots, for which the mean and variance of the number of the neutron detector counts should be determined, can significantly affect the accuracy of determination of prompt neutron decay constant (), espe-cially in case of deep subcriticality. Analysis is based on the Monte Carlo method of calculation (code MCNP) of the simple multiplying systems with different neutron multiplication factors. Simple method of determination of the optimum width of the timeslot, from the standpoint of calculation increasing accuracy, near which it is ad-visable to build the experimental dependence of the dispersion to mean ratio for the determination of . It is also shown that bias estimates of is determined not only by the finite sampling data, but also by the overlapping of neutron chains. That is, the intensity of the external neutron source must not exceed a certain value, which de-pends on the neutron multiplication factor. |
| first_indexed | 2024-04-12T16:55:02Z |
| format | Article |
| id | doaj.art-b9e71b9c80074adcbc6c5a8f7a1b89ef |
| institution | Directory Open Access Journal |
| issn | 1818-331X 2074-0565 |
| language | English |
| last_indexed | 2024-04-12T16:55:02Z |
| publishDate | 2014-06-01 |
| publisher | Institute for Nuclear Research, National Academy of Sciences of Ukraine |
| record_format | Article |
| series | Âderna Fìzika ta Energetika |
| spelling | doaj.art-b9e71b9c80074adcbc6c5a8f7a1b89ef2022-12-22T03:24:16ZengInstitute for Nuclear Research, National Academy of Sciences of UkraineÂderna Fìzika ta Energetika1818-331X2074-05652014-06-01152132139On accuracy of the parameter of deep subcriticality determination by the Feynman methodV. M. Pavlovych0O. V. Pidnebesnyy1Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, UkraineInstitute for Safety Problems of Nuclear Power Plants, National Academy of Sciences of Ukraine, Chornobyl, UkraineThis paper considers the application of the Feynman method of neutron noise analysis for determination of the deep subcriticality parameters for multiplying systems. In particular, it is shown that the selection of the width of the timeslots, for which the mean and variance of the number of the neutron detector counts should be determined, can significantly affect the accuracy of determination of prompt neutron decay constant (), espe-cially in case of deep subcriticality. Analysis is based on the Monte Carlo method of calculation (code MCNP) of the simple multiplying systems with different neutron multiplication factors. Simple method of determination of the optimum width of the timeslot, from the standpoint of calculation increasing accuracy, near which it is ad-visable to build the experimental dependence of the dispersion to mean ratio for the determination of . It is also shown that bias estimates of is determined not only by the finite sampling data, but also by the overlapping of neutron chains. That is, the intensity of the external neutron source must not exceed a certain value, which de-pends on the neutron multiplication factor.http://jnpae.kinr.kiev.ua/15.2/Articles_PDF/jnpae-2014-15-0132-Pavlovych.pdfneutron noisethe Feynman methodconstant Rossi-alphathe Monte Carlo method |
| spellingShingle | V. M. Pavlovych O. V. Pidnebesnyy On accuracy of the parameter of deep subcriticality determination by the Feynman method Âderna Fìzika ta Energetika neutron noise the Feynman method constant Rossi-alpha the Monte Carlo method |
| title | On accuracy of the parameter of deep subcriticality determination by the Feynman method |
| title_full | On accuracy of the parameter of deep subcriticality determination by the Feynman method |
| title_fullStr | On accuracy of the parameter of deep subcriticality determination by the Feynman method |
| title_full_unstemmed | On accuracy of the parameter of deep subcriticality determination by the Feynman method |
| title_short | On accuracy of the parameter of deep subcriticality determination by the Feynman method |
| title_sort | on accuracy of the parameter of deep subcriticality determination by the feynman method |
| topic | neutron noise the Feynman method constant Rossi-alpha the Monte Carlo method |
| url | http://jnpae.kinr.kiev.ua/15.2/Articles_PDF/jnpae-2014-15-0132-Pavlovych.pdf |
| work_keys_str_mv | AT vmpavlovych onaccuracyoftheparameterofdeepsubcriticalitydeterminationbythefeynmanmethod AT ovpidnebesnyy onaccuracyoftheparameterofdeepsubcriticalitydeterminationbythefeynmanmethod |