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New Analysis: Large amount of radioactive materials had discharged through breach in primary containment at Reactor No. 2

Published: March 29th, 2012 at 8:35 am ET
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Title: A scenario of large amount of radioactive materials discharge to the air from the Unit 2 reactor in the Fukushima Daiichi NPP accident
Source: Journal of Nuclear Science and Technology – Volume 49, Issue 4
Author: Fumiya Tanabea
Date Published: 28 Mar 2012

Abstract
Based on an analysis of the measured data with review of calculated results on the core melt accident, a scenario is investigated for large amount of radioactive materials discharge to the air from the Unit 2 reactor. The containment pressure suppression chamber (S/C) should have failed until the noon on 12 March 2011 only by seismic load due to the huge earthquake on 11 March or by combination of seismic deterioration and dynamic load due to steam flowing-in through safety relief valve. Opening of the two safety relief valves (SRVs) at 14 March 21:18 should have resulted in discharge of large amount of radioactive materials through the S/C breach with the measured air dose rate peak value of 3.130E-3Sv/h at 21:37 near the main gate of the site. The containment drywell (D/W) should have failed at 15 March 06:25, at the cable penetration seal due to high temperature caused by the fuel materials heating up on the floor of the D/W, which had flowed out from the reactor pressure vessel. Then large amount of radioactive materials should have been discharged through the D/W breach with the measured air dose rate peak value of 1.193E-2Sv/h at 15 March 9:00.

Primary Containment = Combination of drywell + torus (a.k.a. wetwell) -Source

h/t Anonymous tips

Published: March 29th, 2012 at 8:35 am ET
By
Email Article Email Article
26 comments

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March 29th, 2012 | Category: Reactor No. 2
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26 comments to New Analysis: Large amount of radioactive materials had discharged through breach in primary containment at Reactor No. 2

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