Japan on Wednesday said it will scrap four stricken reactors at its Fukushima nuclear plant, as radiation seeping into seawater reached its highest level yet — 3,355 times the usual amount.Authorities also said that they were mulling plans to cover the damaged reactor buildings with special fabric sheets to limit radiation, days after plutonium was found in the soil of the crippled nuclear plant, situated 220 km northeast of Tokyo.Trade and Industry Minister Banri Kaieda ordered a check of all nuclear reactors in the country to prevent a recurrence of the atomic crisis triggered by the monster magnitude-9 quake and tsunami on 11th March that left nearly 30,000 people dead .