Thesis Open Access

A neutron noise solver based on a discrete ordinates method.

Huaiqian YI


JSON Export

{
  "files": [
    {
      "links": {
        "self": "https://zenodo.org/api/files/4caffce7-7ab9-4721-911f-2a483ddfce33/2020_Yi_Licentiate_thesis_V1.pdf"
      }, 
      "checksum": "md5:62d7415a671e5d26264453cab7149936", 
      "bucket": "4caffce7-7ab9-4721-911f-2a483ddfce33", 
      "key": "2020_Yi_Licentiate_thesis_V1.pdf", 
      "type": "pdf", 
      "size": 2100222
    }
  ], 
  "owners": [
    45514
  ], 
  "doi": "10.5281/zenodo.3813173", 
  "stats": {
    "version_unique_downloads": 8.0, 
    "unique_views": 15.0, 
    "views": 18.0, 
    "version_views": 18.0, 
    "unique_downloads": 8.0, 
    "version_unique_views": 15.0, 
    "volume": 16801776.0, 
    "version_downloads": 8.0, 
    "downloads": 8.0, 
    "version_volume": 16801776.0
  }, 
  "links": {
    "doi": "https://doi.org/10.5281/zenodo.3813173", 
    "conceptdoi": "https://doi.org/10.5281/zenodo.3813172", 
    "bucket": "https://zenodo.org/api/files/4caffce7-7ab9-4721-911f-2a483ddfce33", 
    "conceptbadge": "https://zenodo.org/badge/doi/10.5281/zenodo.3813172.svg", 
    "html": "https://zenodo.org/record/3813173", 
    "latest_html": "https://zenodo.org/record/3813173", 
    "badge": "https://zenodo.org/badge/doi/10.5281/zenodo.3813173.svg", 
    "latest": "https://zenodo.org/api/records/3813173"
  }, 
  "conceptdoi": "10.5281/zenodo.3813172", 
  "created": "2020-05-07T08:04:48.365848+00:00", 
  "updated": "2020-05-11T20:20:43.168922+00:00", 
  "conceptrecid": "3813172", 
  "revision": 2, 
  "id": 3813173, 
  "metadata": {
    "access_right_category": "success", 
    "doi": "10.5281/zenodo.3813173", 
    "description": "<p>A neutron noise transport modelling tool is presented in this thesis. The simulator allows to<br>\ndetermine the static solution of a critical system and the neutron noise induced by a prescribed<br>\nperturbation of the critical system. The simulator is based on the neutron balance equations in<br>\nthe frequency domain and for two-dimensional systems. The discrete ordinates method is used<br>\nfor the angular discretization and the diamond finite difference method for the treatment of the<br>\nspatial variable. The energy dependence is modelled with two neutron energy groups. The<br>\nconventional inner-outer iterative scheme is employed for solving the discretized neutron<br>\ntransport equations. For the acceleration of the iterative scheme, the diffusion synthetic<br>\nacceleration is implemented.<br>\nThe convergence rate of the accelerated and unaccelerated versions of the simulator is studied<br>\nfor the case of a perturbed infinite homogeneous system. The theoretical behavior predicted by<br>\nthe Fourier convergence analysis agrees well with the numerical performance of the simulator.<br>\nThe diffusion synthetic acceleration decreases significantly the number of numerical iterations,<br>\nbut its convergence rate is still slow, especially for perturbations at low frequencies.<br>\nThe simulator is further tested on neutron noise problems in more realistic, heterogeneous<br>\nsystems and compared with the diffusion-based solver. The diffusion synthetic acceleration<br>\nleads to a reduction of the computational burden by a factor of 20. In addition, the simulator<br>\nshows results that are consistent with the diffusion-based approximation. However,<br>\ndiscrepancies are found because of the local effects of the neutron noise source and the strong<br>\nvariations of material properties in the system, which are expected to be better reproduced by a<br>\nhigher-order transport method such as the one used in the new solver.</p>", 
    "language": "eng", 
    "title": "A neutron noise solver based on a discrete ordinates method.", 
    "license": {
      "id": "CC-BY-4.0"
    }, 
    "relations": {
      "version": [
        {
          "count": 1, 
          "index": 0, 
          "parent": {
            "pid_type": "recid", 
            "pid_value": "3813172"
          }, 
          "is_last": true, 
          "last_child": {
            "pid_type": "recid", 
            "pid_value": "3813173"
          }
        }
      ]
    }, 
    "grants": [
      {
        "code": "754316", 
        "links": {
          "self": "https://zenodo.org/api/grants/10.13039/501100000780::754316"
        }, 
        "title": "Core monitoring techniques and experimental validation and demonstration", 
        "acronym": "CORTEX", 
        "program": "H2020", 
        "funder": {
          "doi": "10.13039/501100000780", 
          "acronyms": [], 
          "name": "European Commission", 
          "links": {
            "self": "https://zenodo.org/api/funders/10.13039/501100000780"
          }
        }
      }
    ], 
    "thesis": {
      "university": "Chalmers University of Technology", 
      "supervisors": [
        {
          "affiliation": "Chalmers University of Technology", 
          "name": "Paolo Vinai"
        }
      ]
    }, 
    "keywords": [
      "Neutron noise", 
      "nuclear reactor modelling", 
      "Deterministic neutron transport methods", 
      "Discrete ordinates", 
      "Diffusion synthetic acceleration", 
      "Convergence analysis"
    ], 
    "publication_date": "2020-04-01", 
    "creators": [
      {
        "affiliation": "Chalmers University of Technology", 
        "name": "Huaiqian YI"
      }
    ], 
    "access_right": "open", 
    "resource_type": {
      "subtype": "thesis", 
      "type": "publication", 
      "title": "Thesis"
    }, 
    "related_identifiers": [
      {
        "scheme": "doi", 
        "identifier": "10.5281/zenodo.3813172", 
        "relation": "isVersionOf"
      }
    ]
  }
}
18
8
views
downloads
All versions This version
Views 1818
Downloads 88
Data volume 16.8 MB16.8 MB
Unique views 1515
Unique downloads 88

Share

Cite as