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@lillymunster I would imagine it does. Makes the leaking water even more scary.

@LM Well, then imagine how much hydrazine is released every time we send a rocket to space.

@Nancy From the same article..........In 1-year chronic inhalation studies on hydrazine at concentrations of 0, 0.06, 0.3, 1.3, or 6.5 mg/m3, there were significantly increased incidences of nasal and bronchial tumours (adenomas, adenocarcinomas and carcinomas) in rats of both sexes, thyroid tumours in male rats, and nasal tumours in hamsters at 1.3 and/or 6.5 mg/m3. There was an increased incidence of lung adenomas in female mice at 1.3 mg/m3(MacEwen et al. 1981; Vernot et al. 1985). In chronic oral studies, there was an increased incidence of lung tumours in mice of both sexes treated with hydrazine at a dose of 1.87 mg/kg bw/day (Roe et al. 1967; Toth 1969; Toth 1972). There were no oral carcinogenicity studies identified in rats. However, in a drinking water carcinogenicity study the hydrated form of hydrazine was noted to induce liver tumours in both male and female rats (Steinhoff and Mohr 1988).

Writeup on hydrazine chronic toxicity: oehha.ca.gov (just a data point for people to look at)

@lillymunster Hydrazine is/will be a local issue, relatively short lived .."What happens to hydrazines when they enter the environment?
Hydrazines can be released into the environment during their production or use, or from accidental spills.
Hydrazines easily evaporate to the air, where they are broken down by reactions within minutes or hours.
Hydrazines can also dissolve in water, where they usually break down into less toxic compounds within a few weeks.
Hydrazines may build up in some fish living in contaminated water, but are not expected to remain at high levels over long periods of time.
In soil, hydrazines may stick to particles and be changed within a few days to less harmful compounds.

RBeaner, good link.

But hydrazines aren't expected to stay at high concentrations in fish for long periods. Likely anything close enough to build up a significant hydrazine load is already off-limits due to uptake of radioactivity.

@LM For relatively short periods of time, but is still a powerful toxin but it is important here in that it Scavenges Oxygen from the water, to reduce corrosion, what with all the salt added via salt water.

@LM not unlike when lead was dropped on Chernobyl, some of which then became airborne as fumes and caused a variety of health problems in the area on top of the radiation... There probably aren't many environmentally benign options available to them

It is possible that hydrazine can react with iodine-131 to form hydriodic acid, which is itself toxic.

@Markfm I don't know that, but it sounds reasonable. The amount of hydrazine injection seemed low, but I have no factual data point, anyone...How much hydrazine has been injected?

@Jay They really don't have too many options and I'm sure this is the lesser of evils. It's just one more potential poison for the people of Fukushima.

The below sounds like 1 part hydrazine to 160 parts water.

One other instance was about 2% (1.2 m hydrazine with 56 tons water), and a third case was 0.23 m3 hydrazine with 100 tons water.

In a casualty such as this, there are only Hobson's choice (take it or leave it, by the responsible engineering group) and Dilemma's choice "Between a rock and a hard place" they must take the best chemical actions they have available.

Closure of Japanese plant casts doubt on viability of Sellafield's Mox operation www.independent.co.uk