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Nuclide Analysis Results of Radioactive Materials in the Air at the Upper Part of
the Reactor Building of Unit 1, Fukushima Daiichi <1/2 www.tepco.co.jp

I got 68.6 as an average by taking the 6 readings after 23:00 to 5am on the 9th. So I am not sure where they get the 67.9?

greetings to all

From February 2, water injection to Unit 2 reactor was increased and the temperature tendency was monitored as the
tendency of temperature rise at the bottom of PCV was observed, but the temperature have been high value (around
70.0℃). As a result of the sampling for the Gas Control System of the Unit 2 on February 6 to make sure there is no
re-criticality state, we confirmed that the concentration of Xe-135 was below the detectible limit at the system’s inlet,
meaning that it falls below the re-criticality criteria of 1 Bq/cm
3
. In order not to raise the possibility of re-criticality state due
to the high density of water in the reactor by injecting cold water rapidly, we injected boric acid into the reactor from 0:19
am to 3:20 am on February 7, in advance of increasing water injection amount, as a safety countermeasures against
the re-criticality, and changed the amount of the core spray system injection water from 3.7m
3
/h to 6.7m
3
/h at 4:24 am
(the amount of the feed water system injection is 6.8m
3
/h). Currently, the temperature is approx. 66.8℃ (2/9 11:00) and
we continuously monitor the tendency At 9:47 am February 9, as the amount of water injection decrease, we adjusted the volume from the feed water system
increased from approx. 6.4 m3/h to approx. 6.8 m3/h(the amount of the continuing injection from reactor core spray
system is approx. 6.8 m3/h.
・ From 10:21 am to 12:35 pm on February 9, for the reliability improvement of nitrogen inclusion, we are working for
installing additional flow meter to the nitrogen inclusion line of the Primary Containment Vessel (PCV), and stopped the
inclusion temporarily. There is no significant change at the parameter. www.tepco.co.jp

can you post that in here for a min... or I can go back and get it then we can look what they say

@elaine and lilly, trying to understand exactly how they collect the sample and then analyse it.. they have the qualifier statement (because the measurement result of rare gases in the gas vial container was below the measurable limit, we used the past maximum capture rate for the evaluation)..

@dean sorry it is way out of my comprehension scope

the day of the triffids just got real!!!

@elaine after a week or so those tubing materials will be so entangled with grasses and weeds they probably will clog and then be hard to pry apart.. geeeeeeeeeezh

@dean bit of translation here if you scroll enformable.com

@elainekirk will do a translate on the scribd here in a sec. The grass has been a known problem for a while. It is some sort of really rigid weed that was growing up and poking through the pipe plastic sheeting. There was some thought that while the plant was alive it filled the hole and as the plant died in winter it shriveled creating a leak.

@lilly.. the whole sampling process and counting the samples is complex.. the main thing is for what ever flow rates they have in the system they will take a representative sample and see what's there. The air sampling must also go hand in hand with the effluent sampling to see what's in the water. if the system they hooked up (as I suspect) is the low velocity do as best you can one, it's probably not doing as good as the designed in plant HVAC system which passes 1000's of cubic feet per minute

@dean thank you

What I sense is they have low volume feed water systems and low volume air handling systems as opp
osed to plant design values

\

The sampling as I understand it is more like a "GRAB" sample ie: grab a sample every now and then and check up on things... I like the real time monitors the best to allow time to head off transients

I hope they don't resort to using AGENT ORANGE to spray the Imperata cylindrica plants...

MacDonald (2004) indicates that cogongrass is now considered to be one of the ten most troublesome weeds in the world. Considerable effort is being made to manage and contain this species in Florida, but carelessness and unchecked growth in areas where it now occurs allow continued spread into non-infested areas.

Despite increased vigilance in the southeastern U.S. in regard to cogongrass, varieties of the species such as "Japanese Blood Grass" (I. cylindrica var. koenigii) are still being cultivated and sold as ornamentals in other parts of the country.

fukushima-diary.com 2 is being heated but reactor 5 is steadily being heated as well.

From the plant parameter data of Tepco, the temperature of reactor 5 has gone up by 6.6℃ since 2/1/2012 12:00.