Ex-SKF: Plant "Contamination Map" emerges + 300-900 millisievert debris at No.3

[flamingdem]

See Ex-skf blog for details:

http://ex-skf.blogspot.com/2011/04/fukushima-i-nuke-plant-contamination.html?utm_source=twitterfeed&utm_medium=twitter







----- 300-900 millisievert debris is found

via enenews.com

TEPCO discloses radiation map, NHK, April 24:

<...> Radiation levels around the Number 3 reactor building, which was damaged by a powerful hydrogen explosion, are higher than in other locations, and 300 millisieverts per hour of radiation was detected in debris on a nearby mountainside.

and


TEPCO: Highly radioactive concrete fragment found, NHK, April 24, 2011:

The operator of the damaged Fukushima Daiichi nuclear power plant says that concrete debris emitting a high level of radiation has been found near the Number 3 reactor.

Tokyo Electric Power Company, or TEPCO, says its workers detected radioactivity of 900 millisieverts per hour being emitted from a 30-by-30 centimeter concrete fragment, 5 centimeters thick, on Wednesday. …

The utility believes the contaminated fragment could be part of debris scattered across the compound as a result of a hydrogen explosion at the Number 3 reactor.

[TheWraith]

1. Certainly puts the lie to the "Chernobyl level radiation" claims.

If the most you can get off any of the on-site debris is 900 millisieverts...

[flamingdem]

2. Can you post a link for comparison?

It's still enormously high and the possibility exists for a large scale release
.. and US is warning about No. 1 that is full of water as an earthquake risk, for example.

[CJvR]

3. Here is something about the Liquidators.

http://www.who.int/mediacentre/factsheets/fs303/en/

You might remember the TV images of guys running out on the roof and working for 30 seconds, assuming they got a 100 mSv dose the radiation would have been about 12 Sv/h - this seems fairly likely since the firefighters and initial response team got fatal radiation poisoning in 15-30 minutes.

[Massacure]

4. Wikipedia lists various radiation levels of between 5000 and 300000 mSv/h at Chernobyl

The OP has a chart that looks like radiation is generally less than 50 mSv/h at Fukushima, with the exception of two piles of debris.

[SpoonFed]

9. nice jump on the first post to continue to claim...

that this is nothing like Chornobyl when the trend continues of TEPCO lying-by-omission, feeding the public and international community bread crumbs of information and generally acting like a dis-functional corporation trying to cover up the damage it has done and is continues to do to the environment to say nothing of the local inhabitants and further afield.

So, to summarize, sorry if after 5 weeks of what stinks of continued cover up I'm not all wow, that's great, it's only at levels that probably kill in you 30 days if you're exposed to it for an hour or two.

[Someguyinjapan]

10. Right

So when the Japanese government publically admitted the same day they raised Fukushima to IAEA Level 7 that ultimately the total amount of radiation released could exceed Chernobyl, I suppose they were lying about that as well.

[Throckmorton]

5. I would expect fuel fragments and reactor internals

that may have been stored in the spent fuel pools to be much hotter than 900 milliserverts/hour. I have personally measured rates in excess of 100 severts/hour on used incore detectors (well shielded by refueling pool water of course, measured with a tele-tector). Control Element Assembly extension shafts, which are often stored in the spent fuel pool, also have dose rates around 5 severts/hour on contact on the end nearest the active region of the fuel.

Fresh spent fuel is far hotter than either of these examples, I asked an RE tonight about dose rates off of newly removed fuel (less the 60 days sub-critical) and he said 300 severts/hour for a once burned assembly, and 400 severts/hours for a twice/trice burned assembly is very common. These are all Gamma Doses, as alpha and beta particle dose rates are not directly measured due to the immersion of the fuel in water.

So, given this I see at least 4 possibilities:

1. The explosions did not entrain any material from inside the spent fuel pools and the reading are accurate.
2. The dose rates as reported are from much further away then the 1 meter (3 feet actually) that I am normally accustomed too (closer readings are prefaced with the distance, 'on contact, at 1 foot ...'.
3. They aren't looking for the right activation products (unlikely if general survey instruments are being used, as they are not that selective).
4. They are lying/withholding information about the hottest places (cherry picking the data).

[flamingdem]

6. Interesting analysis

They might take the readings from within a moving vehicle as they did before. Or if it's a robot, as close as it can travel, and they kept them away from the very hot spots around No. 3. Cherry Picking the data, absolutely, selective facts has become their signature. They expect us to know this and calculate accordingly. Always use a multiplier.

[SpoonFed]

7. yeah cherry picking

like this reading is driving by the pit where they buried what we had heard limited reports about them bulldozing?
or is this another case of off-by-one-hundred readings...

[Someguyinjapan]

8. I'll choose door #4

Given the pattern established by TEPCO and the Japanese government over the past few weeks, the last option has a very high probability of being the most accurate one.