
rpv bottom head had its minimum on 2012/1/27 5:00 with 37.0°C. strong rise since then !
by Edano 2/5/2012 5:12:15 PM

@Edano what could happen if it keeps rising
by elainekirk 2/5/2012 5:15:42 PM

@Edano what about the various others trending up?
by lillymunster 2/5/2012 5:15:42 PM

the green temp has been rising from 23 to 31.6 now. it's the rpv drain pipe top, near the rpv bottom.
by Edano 2/5/2012 5:18:53 PM

@Edano so they cannot clain faulty measure
by elainekirk 2/5/2012 5:20:32 PM

there are some cryptic notes in #2 csv files:
"不具合の可能性が確認されたため原因調査中(D/W HVH戻り温度,原子炉抑制室ガス温度) - (Temperature, room temperature gas reactor suppressed return D / W HVH) being investigated for potential cause of failure "has been confirmed
状況推移を継続確認中とする(D/W HVH戻り温度,原子炉抑制室ガス温度) - (Temperature, room temperature gas reactor suppressed return D / W HVH) to ensure continuity in the transition state
(google translation)
by Edano 2/5/2012 5:24:23 PM

uuuuuhhhh. So it is confirmed to be working or failed? :-)
by lillymunster 2/5/2012 5:26:29 PM

@lillymunster that' the problem with google translator. it could mean both :)
by Edano 2/5/2012 5:27:18 PM

on the other hand, tepco has proven in the past that they are able to manipulate the temperatures quite easily by injecting more or less water. so i am optimistic.
by Edano 2/5/2012 5:29:34 PM

@Edano they have been increasing the injecting of water for days and the temp keeps going up.
by lillymunster 2/5/2012 5:30:20 PM

@lillymunster what had the best effects, was the core spray system. i'm not sure if it is still working and if it is being used right now.
by Edano 2/5/2012 5:34:46 PM

@UKVal maybe it's the same in #2 ?
by Edano 2/5/2012 5:38:48 PM

@UKVal :( yep. :)
by Edano 2/5/2012 5:39:50 PM

so they reduced the core spray and consequently rpv temps rose. the question is: was the reduction accidentally or purposely and can they increase it again ?
by Edano 2/5/2012 5:41:28 PM

@Edano just a mo they explained
by elainekirk 2/5/2012 5:42:00 PM

To improve reliability of water injection to the reactors, the injection
line connecting to the reactor injection pump on the hill was replaced
with polyethylene pipes and we have been changing the route for reactor
injection from feed water system to reactor core spray system in a
stepwise manner. After completion of adjusting water flow amount as
planned on February 2, tendency of temperature rise at the bottom of PCV
was observed. Thus, at 7:20 pm on February 3, we changed the injection
amount into Unit 2 reactor through feed water system from approx. 2.9 m3/h
to approx. 4.9 m3/h and changed that though reactor core spray system
from approx. 5.8 m3/h to approx. 3.8 m3/h (which means setting them at
those of before flow adjustment on February 1). As for the temperature
rise, the temperature at the upper head of the bottom of PCV has risen to
approx. 66.8 °C at the highest (as of 7 am on February 4), but currently,
it is approx. 64.8°C (as of 11 am on February 4). The trend of the
temperature rise seems to be steady and we will monitor it continuously.
www.tepco.co.jpby elainekirk 2/5/2012 5:45:24 PM

UN supports reactor restarts
www.abc.net.auby lillymunster 2/5/2012 5:45:43 PM

@elainekirk So TEPCO isn't calling it a non-issue?
by lillymunster 2/5/2012 5:46:50 PM

10a.m. Feb 5th
After that, we have observed the tendency of temperature at the upper
head of the bottom of PCV. Because we found the temperature has risen
again (approximate 66.1 °C at 11:00 pm on February 4), at 12:52 am on
February 5, we changed the water injection volume to Unit 2 reactor
through the feed water system from approx. 4.8 m3/h to approx. 5.8 m3/h
(the water injection through the reactor core spray system remains
approx. 3.8 m3/h). At this moment, the temperature indicates 67.4 °C (as
of 5:00 am on February 5). we will monitor it continuously.
www.tepco.co.jpby elainekirk 2/5/2012 5:53:55 PM

so there is still corium in the rpv bottom it seems :)
by Edano 2/5/2012 5:55:32 PM


2.bp.blogspot.com i can't find 71.7° anywhere...

the 68 is the highest fig I have seen from tepco
by elainekirk 2/5/2012 5:59:32 PM

"2/5/2012 11:00AM : 68.6℃ 4:00PM : 71.7℃ (+3.1℃)" - fukushima diary claims that, but there is no official measuring at 4:00
fukushima-diary.comby Edano 2/5/2012 5:59:47 PM

Does the feed water system hit the bottom of the RPV directly?
by lillymunster 2/5/2012 6:00:03 PM

Yomiuri cites 71.7 temperature
www.yomiuri.co.jpby lillymunster 2/5/2012 6:00:51 PM

the tepco sources don't support that number as far as i can see.
by Edano 2/5/2012 6:03:32 PM

There are some increases in the torus also maybe the feedwater leaks out more or core spray rate is inaccurate or running out of the RPV somewhere different than feedwater?
by lillymunster 2/5/2012 6:03:53 PM

then again tepco last update is morning of the 5th they havent given the pm one
by elainekirk 2/5/2012 6:04:55 PM

@Mid Valley yes
by lillymunster 2/5/2012 6:11:37 PM

Good morning from Las Vegas!
by bo 2/5/2012 6:16:06 PM

Hi Bo! How goes Vegas? :-)
by lillymunster 2/5/2012 6:19:00 PM

@elainekirk the release times are
always 5:00 11:00 17:00 23:00 never 4:00 and if they would never say 4:00 pm they always say 16:00.
www.tepco.co.jpby Edano 2/5/2012 6:24:09 PM

@lilly it is Super Bowl Sunday, so Vegas is like the Vatican today.
by bo 2/5/2012 6:24:48 PM

I'm meeting with downwinders for a few days, and then touring the former Nevada Test Site on Thurs.
by bo 2/5/2012 6:26:52 PM

@bo full of Catholics?
by lillymunster 2/5/2012 6:30:23 PM