Which of the following statements about nuclear fuel are correct? 1. Spent fuel is highly radioactive. 2. Fuel has to be enriched. 3. Failure of the control system can lead to a meltdown. Select the answer using the code given below.
1, 2 and 3
Statement 1 is correct: nuclear spent fuel still contains highly radioactive fission products and unconverted fissile material, so it must be handled, cooled and stored/reprocessed under strict shielding for years.
Statement 2 is correct: natural uranium is only about 0.7% fissile U-235, so for most reactor designs the fuel must be enriched to raise the U-235 concentration before it can sustain an efficient chain reaction.
Statement 3 is correct: the control rods/control system regulate the rate of the chain reaction by absorbing neutrons; if this system fails, the reaction can run away, overheat the core and cause a meltdown, as seen historically in incidents like Chernobyl and Fukushima.
Since all three statements are correct, the answer is 1, 2 and 3.
Important Questions from Scientific Developments
The scientific study of fishes is called ________.
The term 'mitochondria' was coined by:
Who is remembered as the pioneer of mitosis research and the founder of cytogenetics?
Sedimentation coefficient ‘S’ (Svedberg's Unit) is indirectly a measure of:
______often referred to as shock treatment, is a psychiatric treatment in which seizures are electrically induced in patients to provide relief from psychiatric illness.
A. Electromyography (EMG)
B. Electrocardiogram (ECG)
C. Electroencephalography (EEG)
D. Electroconvulsive therapy (ECT)
