WRAPUP 9-Radioactive water at 5 mln times legal limit found at Japan plant

* Liquid glass latest hope of stemming radioactive water

* Govt says sorry for releasing contaminated water

* TEPCO says hopes to avoid summer electricity blackouts

* Govt sets standards for seafood from reactor region

* Fukushima politicians meet PM Kan to demand compensation

(Adds India imposes blanket ban on food imports from Japan)

By Mayumi Negishi and Yoko Nishikawa

TOKYO, April 5 (Reuters) – The operator of Japan’s crippled
nuclear power plant said on Tuesday it had found water with 5
million times the legal limit of radioactivity inside a reactor
as it struggles for a fourth week to contain the world’s biggest
nuclear disaster in quarter of a century.

Underlining the concern over spreading radiation, the
government said it was considering imposing radioactivity
restrictions on seafood for the first time in the crisis after
contaminated fish were found in seas well south of the damaged
nuclear reactors.

The plant’s operator Tokyo Electric Power Co
(TEPCO) offered token “condolence” money to those
affected in the Fukushima region where the plant is based, but
the local mayors who came to Tokyo to meet Prime Minister Naoto
Kan made clear they expected far more help.

“We have borne the risks, co-existed and flourished with
TEPCO for more than 40 years, and all these years, we have fully
trusted the myth that nuclear plants are absolutely safe,”
said Katsuya Endo, the mayor of Tomioka town.

He was one of eight Fukushima prefecture mayors who went to
Kan to demand compensation and support for employment, housing
and education for the tens of thousands of people evacuated as a
result of the radiation crisis .

In desperation, engineers at the Fukushima Daiichi plant
have turned to what are little more than home remedies to stem
the flow of contaminated water. On Tuesday, they used “liquid
glass” in the hope of plugging cracks in a leaking concrete pit.

“We tried pouring sawdust, newspaper and concrete mixtures
into the side of the pit (leading to tunnels outside reactor
No.2), but the mixture does not seem to be entering the cracks,”
said Hidehiko Nishiyama, deputy director-general of Japan’s
Nuclear and Industrial Safety Agency (NISA).

“We also still do not know how the highly contaminated water
is seeping out of reactor No.2,” said Nishiyama.

TEPCO said it suspected that a stone layer beneath the
trench feeding into the pit at reactor No. 2 might be the source
of the contaminated water, but added they were still
investigating the exact causes and were prepared for the
possibility that there were other sources of radioactive water.

Engineers also plan to build two giant polyester
“silt curtains” in the sea to block the spread of more
contamination from the plant.

Workers are still struggling to restart cooling pumps —
which recycle the water — in four reactors damaged by last
month’s 9.0 magnitude earthquake and tsunami.

Until those are fixed, they must pump in water from outside
to prevent overheating and meltdowns. In the process, that
creates more contaminated water that has to be pumped out and
stored somewhere else or released into the sea.

There is a total of 60,000 tonnes of highly contaminated
water in the plant after workers frantically poured in seawater
when fuel rods experienced partial meltdown after the tsunami
hit northeast Japan on March 11.

TEPCO on Monday had to start releasing 11,500 tonnes of
low-level radioactive seawater after it ran out of storage
capacity for more highly contaminated water. The release will
continue until Friday.

FIVE MILLION TIMES LEGAL LIMIT

Radioactive iodine of up to 4,800 times the legal limit has
been recorded in the sea near the plant. Caesium was found at
levels above safety limits in tiny