location in the charcoal filters
English translation: data of (activity and (location in the charcoal filter))
| 18:18 Sep 6, 2016 |
| English language (monolingual) [PRO] Science - Nuclear Eng/Sci | |||||||
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|  Selected response from: Didier Fourcot Local time: 10:07 | ||||||
Grading comment
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| SUMMARY OF ALL EXPLANATIONS PROVIDED | ||||
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| 4 +1 | data of (activity and (location in the charcoal filter)) |
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| 3 | location of the charcoal filters |
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| Discussion entries: 7 | |
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Answers
14 hrs confidence: 
peer agreement (net): +1
peer agreement (net): +1data of (activity and (location in the charcoal filter)) Explanation: Poor wording in English, probably translated from Japanese, the key term is "activity", that is to be understood as the technical term in nuclear field: https://global.britannica.com/science/activity-radioactivity The charcoal filters of the SGTS receive flow from a number of pipes; in normal conditions these filter receive only nominal contamination (activity) roughly equally on their whole surface or voume (a bit more at the inlet, a bit less at the exhaust). In case of accidental release, the part of the filter closer to the opening of the pipe being source of the release has much higher activity, because it has captured most of the contamination, so looking at the activity data (that may also give clues about the nature of the release) and the location of this activity inside the filter determines the position of the pipe that is most likely source of the contamination (and this may be non-obvious because overpressures may have induced unplanned backflows, blown non-return valves or triggered rupture discs). Look at this drawing of the SGTS: https://bravenewclimate.files.wordpress.com/2011/05/unit4fir... from this report: https://bravenewclimate.com/2011/05/18/fukushima-open-thread... and from page 11 the "dose survey results" of this TEPCO doc (don't know by the way if this doc is earlier or later than the one translated, this could need checking), they do clearly demonstrate that the activity is measured by a dose survey in different parts of the SGTS filters http://www.tepco.co.jp/en/press/corp-com/release/betu15_e/im... |
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6 hrs confidence:
location of the charcoal filters Explanation: You should read "in" as "of" because I believe what the author wants to say is that it is the location of the charcoal filters, along with the activity data, that made them to assume that gas flew from Unit 3 to Unit 4. -------------------------------------------------- Note added at 13 hrs (2016-09-07 07:51:45 GMT) -------------------------------------------------- "The SGTS consists of two parallel and redundant filter trains." http://www.nrc.gov/docs/ML1218/ML12188A284.pdf -------------------------------------------------- Note added at 15 hrs (2016-09-07 09:55:25 GMT) -------------------------------------------------- I think it's primarily the location of the filters rather than the amount of hydrogen those filters filtered that counts in assuming that the hydrogen gas came from Unit 3. Although the contamination level of the filters supports their assumption, in order to make such an assumption, the filters need to be between Unit 3 and the part of Unit 4 that exploded, and the link below shows that the SGTS (turquoise box) in Unit 4 (in blue) is in between Unit 3 (in grey) and the part of Unit 4 that exploded. (The tower in front of Unit 3 is the chimney.) http://www.tepco.co.jp/nu/fukushima-np/outline/images/img_ou... Thttp://www.tepco.co.jp/nu/fukushima-np/outline/images/img_ou... -------------------------------------------------- Note added at 17 hrs (2016-09-07 11:30:19 GMT) -------------------------------------------------- Please see page 7 of 18. "The SGTS exhaust pipe of Unit 4 joins the Unit 3 exhaust pipe at the main exhaust stack convergence part. → It is presumed that the PCV ventilation gas from Unit 3 flowed into the Unit 4 R/B through the SGTS piping." https://www.nsr.go.jp/data/000059292.pdf If the SGTS had been placed somewhere else, the gas from Unit 3 may not have entered Unit 4 to induce the explosion. -------------------------------------------------- Note added at 18 hrs (2016-09-07 12:54:40 GMT) -------------------------------------------------- Found this, which refers to the physical location of the filters (the English isn't very good, though). See page 4 of 20 (What has caused the hydrogen explosion of the R/B at unit4). http://www.tepco.co.jp/en/nu/fukushima-np/images/handouts_12... |
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