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@Markfm dont think so if tepco is correct there is no much damage to fuel in SFP

@Markfm They thought some material was ejected. But they also had a bunch of reactor parts in the SFP at the time of the explosion. Make me wonder if parts of those objects are what was strewn about in the explosion. There were also comments that the hot spots if caused by fuel chunks would be much hotter or burning?

Here's what I get for SFP 4 water since March 22: Concrete pump trucks (58m class) is about 150t water discharge (March 22, 17:17 to 20:32);Concrete pump trucks (58m class) is about 130t water discharge (March 23, 10:00 to 13:02); Concrete pump trucks (58m class) is about 150t water discharge (March 24, 14:36 to 17:30; Concrete pump trucks (58m class) is about 150t water discharge (March 25, 19:05 to 22:07); Concrete pump trucks (58m class) is about 125t water discharge (March 27, 16:55 to 19:25); Concrete pump trucks (58m class) is about 140t freshwater discharge (March 30, 14:04 to 18:33);Concrete pump trucks (58m class) is about 180t freshwater discharge (April 1, 8:28 to 14:14); Concrete pump trucks (58m class) is about 180t freshwater discharge (April 03, 17:14 to 22:16); Concrete pump trucks (58m class) is about 20t fresh water discharge (April 05, 17:35 to 18:22)Concrete pump trucks (58m class) is about 38t fresh water discharge (April 07, 18:23 to 19:40) Concrete pump trucks (58m class) is about 90t fresh water discharge (April 09, 17:07 to 19:24) Concrete pump trucks (62m class) is about 195t freshwater discharge (April 13, 0:30 to 6:57); Concrete pump trucks (62m class) is about 140t freshwater discharge (April 15, 14:30 to 18:29); Concrete pump trucks (62m class) is about 140t freshwater discharge (April 17, 17:39 to 21:22)Concrete pump trucks (62m class) is about 40t fresh water discharge (April 19, 10:17 to 11:35)

From one of the PDF's posted this morning. This is the time frame for that core replacement & maint work they were doing on #4. Someone mentioned they were 180 days into the process. This blurb says it takes longer to do it so they were likely in the shroud swap out process or getting ready to do it when the quake hit. "the period of this outage, including core internals replacement, was initially expected to be 300 days. Actually, however. the whole period took 422 days. www.jsme.or.jp

@Markfm would be interesting to match those with the daily heat maps and see if a pattern emerges?

I count roughly 1200 tons of water poured into there over the 22 March - 3 April. That's a huge amount of water.

They're WMV9 encoded, looks like an oddball frame size, from a quick look. VLC does wonders with them :)

WTF? Each zipped video is a couple of seconds long of filming over someone's shoulder of the laptop screen of the robots. XXX can you let me know if you find anything significant? Do you have the ability to upload them to youtube?

@xxx It is a freaking game. :-( Zip a pile of five second videos.

@Nancy I can connect them in one video...

@xxx Yeah, you can just use 'cat'

Nancy, see what comes out on cryptome

@Markfm That is what I thought. I know those systems are capable of recording.

It was probably 640x360 pixel initially, looks like the released video was 320x180.

It might have even been actual 720p hd originally.

Radiation Control in the Core Shroud Replacement Project of Fukushima-Daiichi NPS Unit #2 Introduction In June 1994, a fissure caused by a stress corrosion crack was detected in the shroud main body installed in the reactor pressure vessel in Unit #2 of this station. The structure of shroud is shown in Fig.1 Construction of shroud. Countermeasures in this case included reinforcement of the cracked portion with brackets as well as a visual inspection every two periodical inspections on the weld line where cracks were reported frequently at all six plants. Hydrogen injection was also started sequentially in 1996. Since 1997, hydrogen injection has been done at all plants of the Fukushima-Daiichi Nuclear Power Station.
In addition to these items, preventive maintenance measures to cope with stress corrosion cracking
included replacement of SUS304-made shrouds in Units #1, 2, 3, and 5 sequentially with that using the material (SUS316L) that is resistant to stress corrosion cracking. P-6a-290
Shielding of the reactor inside the wall: Shielding was provided for the highly-radioactivated reactor wall and for the reactor bottom where radioactive materials tend to accumulate. For the reactor wall, 36 pieces of 7 m high and 3 ton weight shields were provided. Each shield consists of the 80 mm thick lead covered by 5 mm thick stainless steel. The reactor bottom was provided with a 25 mm thick stainless steel shield. The reactor wall shield is shown in Fig. 6. Radiation Control in the Core Shroud Replacement Project ofFukushima-Daiichi NPS Unit #2

Radiation Control in the Core Shroud Replacement Project ofFukushima-Daiichi NPS Unit #2 www.irpa.net

@dean new thermography: reactor 4 core temp bigger 11C than sfp...

@dean I didn't understand about the H2 either.

@dean are you talking some sort of temporary shielding to give the workers a safe area to work?