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For how many days is radioactive solid waste kept is kept under water at 6m deep for initial cooling?

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For how many days is radioactive solid waste kept is kept under water at 6m deep for initial cooling?

(a) 15 days

(b) 50 days

(c) 30 days

(d) 100 days

The question was posed to me in an interview for job.

This is a very interesting question from Disposal of Nuclear Waste topic in portion Nuclear Power Plant of Energy Engineering

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The correct answer is (d) 100 days

Easiest explanation: It is necessary to keep the radioactive solid waste first in the water of 6m depth nearly for 100 days. It was found that after 100 days cooling of radioactive waste of 28MW plant in water still has a radioactivity equal to million grams of radium. About 50% radioactive elements disappear during cooling.

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