B211 Robustization of High Efficiency Filtered Containment Venting System by using AgX

Narabayashi, Tadashi; Aida, Toshihiro; Kanai, Takahiro; Konno, Takahiro; Ito, Sukehiro

doi:10.1299/jsmepes.2015.20.219

Cited by 2 publications

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“…Based on equation (7), DF is expressed by equation ( 8). (8) Therefore, to reach a certain DF, the longer the contact time is, the lower the reaction speed may be. On the other hand, it is thought that the decline in the reaction speed is caused by the sequential progression of silver ions from the reactive surface of silver zeolite particles toward their interior.…”

Section: (2) Confirmation Of Basic Performancementioning

confidence: 99%

“…Relevant knowledge is required to deal with these issues before an organic iodine filter with silver zeolite can be developed for FCVS. There have been reports by Ishii et al 7) and Narabayashi et al 8) on the application of silver zeolite to FCVS, but the performance characteristics in an actual device under the assumed conditions has not been presented. Kobayashi et al 9) has reported on the adsorption performance characteristics of silver zeolite under various flow conditions, but it is necessary to understand the performance characteristics for the organic iodine concentration at a gas temperature much closer to the usage conditions of the actual device, especially during the initial venting stage when the conditions are more severe.…”

Section: Introductionmentioning

confidence: 99%

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Development of an Organic Iodine Filter for Filtered Containment Venting Systems of Nuclear Power Plants

Kawamura

Kimura

Watanabe

et al. 2021

Insights Concerning the Fukushima Daiichi Nuclear Accident Vol. 4

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A design for an organic iodine filter was developed for filtered containment venting systems of nuclear power plants. After the Fukushima Daiichi Nuclear Accident, filtered containment venting systems were developed and installed at nuclear power plants in Japan employing aerosol filters, which are typically combinations of alkaline water scrubbers and metal fiber filters. Using silver zeolite, the newly designed filter absorbs organic iodine, which cannot be captured with alkaline water scrubbers and metal fiber filters. Methyl iodide absorption performance tests were conducted with various gas velocities and compositions, which covered the operating conditions of filtered containment venting systems. The test results demonstrated that the decontamination factors of the silver zeolite were over 50 if an appropriate gas contact time was ensured, even though steam condensation and the existence of hydrogen during vent startup had negative effects on the absorption performance. It was also revealed from the tests that intermittent venting might dampen the silver zeolite and reduce its absorption performance. Flow control of the vent gas was found to be an effective countermeasure to maintain the performance even under such conditions. Filter unit tests and numerical analyses of the gas flow within the filter vessel confirmed that the gas contact time was uniform in the filter and appropriate for achieving a decontamination factor of 50.

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Section: (2) Confirmation Of Basic Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of an Organic Iodine Filter for Filtered Containment Venting Systems of Nuclear Power Plants

Kawamura

Kimura

Watanabe

et al. 2021

Insights Concerning the Fukushima Daiichi Nuclear Accident Vol. 4

Self Cite

View full text Add to dashboard Cite

show abstract

Development of an Organic Iodine Filter for Filtered Containment Venting Systems of Nuclear Power Plants

Kawamura

Kimura

Watanabe

et al. 2016

Transactions of the Atomic Energy Society of Japan

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A design for an organic iodine filter was developed for filtered containment venting systems of nuclear power plants. After the Fukushima Dai-ichi nuclear accident, filtered containment venting systems were developed and installed at nuclear power plants in Japan employing aerosol filters, which are typically combinations of alkaline water scrubbers and metal fiber filters. Using silver zeolite, the newly designed filter absorbs organic iodine, which cannot be captured with alkaline water scrubbers and metal fiber filters. Methyl iodide absorption performance tests were conducted with various gas velocities and compositions, which covered the operating conditions of filtered containment venting systems. The test results demonstrated that the decontamination factors of the silver zeolite were over 50 if an appropriate gas contact time was ensured, even though steam condensation and the existence of hydrogen during vent startup had negative effects on the absorption performance. It was also revealed from the tests that intermittent venting might dampen the silver zeolite and reduce its absorption performance. Flow control of the vent gas was found to be an effective countermeasure to maintain the performance even under such conditions. Filter unit tests and numerical analyses of the gas flow within the filter vessel confirmed that the gas contact time was uniform in the filter and appropriate for achieving a decontamination factor of 50.

show abstract

B211 Robustization of High Efficiency Filtered Containment Venting System by using AgX

Cited by 2 publications

References 0 publications

Development of an Organic Iodine Filter for Filtered Containment Venting Systems of Nuclear Power Plants

Development of an Organic Iodine Filter for Filtered Containment Venting Systems of Nuclear Power Plants

Development of an Organic Iodine Filter for Filtered Containment Venting Systems of Nuclear Power Plants

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