ScribbleLive

@elainekirk , interesting. The diagrmas show where the furniture is on the ground floor of Daichi Units 2 - 4. Elaine, thanks for the link to the Hamaoka reactor incident. The operators must have been scared sh**less. The floor plan identifies a control rod drive repair room, very confidence-building.

Interesting bit of info in the accident report under (5) Cause and countermeasure 3, (6) Field investigation : "Most of the ceiling and the wall of the concerned heat exchanger room turned reddish-brown." We just saw reddish brown stains, did not we?

@PeterMetzer thank you for your post "Someone posted this site www.enviroreporter.com earlier which I thought is an excellent example for an independent monitoring site. The person asked for our opinion on recent air filter readings published on the site. Here is my take: The median increase in CPM above background of the filter readings is roughly 45 CPM which translates into 0.13 microSv/h or 130 nanoSv/h, according to the conversion provided on the site. For comparison, I provide a reading the Japanese government published in its NISA report to the IAEAfukushima.grs.de , page V-23, below: "The air dose rate was measured on March 30 to April 2, and April 18 and 19, and MEXT released the results on April 21. The measurement results of radioactive materials in air and soil radioactivity concentration conducted on April 2 and 18 were released by the Ministry on April 25. After that, the Ministry releases the results sequentially on and after May 12.
(Measurement method)
･ The air dose rate is measured using more than one monitoring car. The GM (Geiger-Muller) counter, ionization chamber and NaI scintillation detector are used as detector. The soil radioactivity concentration is measured using germanium semiconductor detector for 1,000 or 3,600 seconds per sample (which varies by sample).
(Measurement results)
･ As to the air dose rate within 20km from Fukushima Dai-ichi NPA, relatively high dose
rate (highest value: 124µSv/h at【44】on April 2) was detected in the northwest direction." The doses measured in the air filters in Santa Monica are 1000 times lower and accumulated over roughly three weeks."
by Peter Melzer 6:44 AM

@elainekirk , found no Cs yet, but "Residual water stayed in the down-stream side ruptured pipe was analyzed. As a result of it, ammonium ion and nitric ion were detected in ion analysis. Iron, nickel, chromium and zinc contents were recognized in metal analysis. Co-60 and Mn-54 contents were recognized in radioactivity analysis."

@Edano , yup: "Radioactivity analysis of the deposited materials to the inner surface of the concerned portion (of the ruptured pipe, ed.) were performed. As a result of it, Co-60 and Mn-54 contents were detected. Iron, nickel, chromium and zinc contents were also recognized in metal analysis."

...and now to the great finale: "Evaluating above investigation result, it is estimated that prompt hydrogen burning might be the main contributor of the internal pressure increasing, which caused rupture and deformation of the concerned pipe."

@Edano , I am still examining this, but assume they mean hydrogen from radiolysis that accumulated in a pocket where the pipe had a bend.

I must correct one of my posts, the high concentrations of hydrogen and oxygen were found in the intact pipe of the unharmed unit, that is Unit 2, whereas the remaining piping of Unit 1 still contained somewhat elevated levels after the rupture. Hence this should have read:
"Resident gas component analysis stayed in the steam condensate system pipe (A) of the residual heat removal system in the Unit-1 and in the similar location of the same pipe in the Unit-2 was performed. As a result of it, higher concentrations of hydrogen (0.6vol%) and oxygen (19vol%) in comparison with air were detected in (A) system of the Unit-1 (the one with the pipe rupture, ed.). High concentrations of hydrogen (46vol%) and oxygen (23%vol) were detected in the Unit-2."

@elainekirk , yes, definitely. Thanks, what this tells us is that the pipe of the intact unit could have exploded anytime. As a result of this fiasco, the operator pledged to install valves near that location to release the gases periodically in all other reactors with the same RHR piping layout.

OK... As a person in this current struggle in Japan, I don't have cognitive room to think about reactors' situations. Is it OK?

@ikrockhopper Good to meet you, bye the way!

@Mid Valley good to meet you! Talk to you soon! Thankyou for your support!

@Edano yes, but we have many other faces :(