Preliminary analysis of polonium-210 contamination for China LEAd-based Research Reactor

Mao, Lanfang; Dang, Tongqiang; Pan, Lingyang; Zeng, Qin; Bai, Yunqing

doi:10.1016/j.pnucene.2013.07.009

Cited by 10 publications

(2 citation statements)

References 7 publications

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“…However, these methods are not applicable for removing polonium evaporated from liquid LBE. Without any prevention means, polonium on the surface of the liquid LBE and its vapor in the cover gas will diffuse out of the main system and be released into the atmosphere during reactor maintenance and coolant leakage accidents [10][11][12][13]. Therefore, removal of polonium from the gas phase needs to be seriously examined.…”

Section: Introductionmentioning

confidence: 99%

Removal of the Homolog Tellurium of Polonium by SiO2 Nanofiber Filter for Lead Alloy-Cooled Reactors

Chen

Zeng

et al. 2022

Toxics

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The lead–bismuth eutectic (LBE) can be easily activated by neutron radiation to produce the radionuclide 210Po. It is therefore necessary to establish an effective method to remove vaporized polonium in the cover gas to prevent its release into the air in scenarios of reactor maintenance and coolant leakage accidents. This paper presents a SiO2 nanofiber membrane prepared based on the electrostatic spinning and calcination process. The SiO2 nanofiber membrane had the advantages of good flexibility, high-temperature resistance, and corrosion resistance. In the trapping experiments, the SiO2 nanofiber membrane filters showed excellent filtration performance at 300~400 °C, and the filtration efficiencies for Te, Pb, and Bi could reach 99%, 99%, and 98%, respectively. Proper filtration temperature and gas flow rate are important to maintain high filtration efficiency. After five cycles, the SiO2 nanofiber membrane filter still exhibited excellent cycle-use performance. In the density functional theory (DFT) calculations, PbPo and PbTe had strong interactions with amorphous SiO2, having adhesion energies of −2.96 to −2.83 eV/molecule.

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Section: Introductionmentioning

confidence: 99%

Removal of the Homolog Tellurium of Polonium by SiO2 Nanofiber Filter for Lead Alloy-Cooled Reactors

Chen

Zeng

et al. 2022

Toxics

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“…And the ALI for ingestion and inhalation are 1.11 × 10 5 Bq and 2.22 × 10 4 Bq, respectively (Nuclear Regulatory Commission 10CFR, 2017). In China, the National Standard GB18871-2002 rules mention the ALI of 210 Po as 8.3 × 10 4 Bq, and the exemption concentration as 10 4 Bq (Mao, 2014), the National regulation on 210 Po of RA, US, and CN are given in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Multi-Physics Model Development for Polonium Transport Behavior in a Lead-Cooled Fast Reactor

et al. 2021

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210Po, a highly toxic element with strong volatility, is one of the main source terms of a Gen-IV lead-cooled fast reactor (LFR). Therefore, the radioactive safety caused by 210Po has become an important topic in LFR-related research. In order to simulate the behavior of 210Po in an LFR, this work developed a multi-physics model of an LFR from the perspective of radioactive transport. Considering the effects of nuclide decay, cover gas leakage, containment ventilation, and Po aerosol deposition, a comprehensive simulation was carried out to evaluate the sensitivity of those effects on the 210Po distribution in detail. Preliminary results indicate that during normal operation, most of the 210Po in the LBE exist in the form of PbPo, and around 10–9 of 210Po could evaporate from the LBE into the cover gas, and then further leak into the containment. In addition, even if the leakage rate of 210Po in the cover gas into the containment is maintained at 5‰ per day, due to the deposition of Po aerosol, the 210Po contamination on the inner surface of the containment is still below the radioactivity concentration limits.

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Assessment of radiation risk from waste generated from mining and remediation process of granite ore

Essa

Daher

Nasr

et al. 2021

J Radioanal Nucl Chem

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Preliminary analysis of polonium-210 contamination for China LEAd-based Research Reactor

Cited by 10 publications

References 7 publications

Removal of the Homolog Tellurium of Polonium by SiO2 Nanofiber Filter for Lead Alloy-Cooled Reactors

Removal of the Homolog Tellurium of Polonium by SiO2 Nanofiber Filter for Lead Alloy-Cooled Reactors

Multi-Physics Model Development for Polonium Transport Behavior in a Lead-Cooled Fast Reactor

Assessment of radiation risk from waste generated from mining and remediation process of granite ore

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