0
What safety precautions must be in place to ensure that the nuclear reaction does not go super critical?
Wiki User
∙ 13y ago
When starting up a reactor it must be made slightly supercritical so that the neutron flux rises at a controlled rate. This is done by a small control rod withdrawal. Then when the desired power level is reached, the rods are inserted a small amount so the reactor is then just critical and continues at a steady rate.To protect against too large a rod movement leading to a rapid power increase, there are neutron flux sensing instruments that will detect both a too rapid increase (called the doubling time) and probably a high level relative to the desired power level, in absolute terms. These instruments will be connected to the reactor safety circuits so that if the operator ignores the warnings the control rods will be inserted automatically.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
How do you ensure the reaction between group 1 element with water is stoped?
The reaction is stopped when no hydrogen is released.
In respect to nuclear fission and nuclear fusion what is meant by the term critical mass?
The term critical mass does not relate to nuclear fusion. Nuclear fusion is the fusing, the joining, of two or more nucleons or nuclei to create a heavier nucleus. It takes enormous energy to set up the conditions that will make this happen. Fusion occurs naturally in stars, and is the mechanism that powers them up. Stars operate in an equilibrium wherein nuclear fusion tries to force everything apart and gravity holds everything together. Nuclear fission is the splitting of atoms, the splitting of atomic nuclei, and it can be looked at as the opposite of fusion. In fission, certain materials - and of them, only uranium-235 occurs naturally - will, when a certain minimum amount is brought together, begin to fission. They will spontaneously begin to fission because that certain minimum amount, the critical mass, has been brought together. The natural decay of the radionuclide releases neutrons, and when a critical mass is brought together, the naturally released neutrons now can build a chain reaction. The material goes critical because critical mass has been reached. Note: We're giving thorium the day off here (which does not fission well itself but is usually converted in a reactor to uranium-233), and plutonium can be found with uranium only in the most minute amounts. A link is provided to an article on critical mass posted by our friends at Wikipedia, where knowledge is free. Basically, critical mass is the level of mass that something reaches to make something happen. As a solid metal sphere inside a sphere of uranium, the critical mass of plutonium is 6.4 kg, the core of the MK-III atomic bomb (Gadget at Trinity & Fatman at Nagasaki) was 6.2 kg and became a supercritical mass when imploded using chemical explosive lenses. To ensure a good yield and not depend on natural spontaneous neutron production (which might cause a fizzle) at the optimal moment of supercriticality, a neutron source fired a pulse of neutrons to start the chain reaction. There is a sense where stellar fusion has critical mass: a protostar whose mass is too low cannot ignite fusion in the first place and becomes a brown dwarf. However the term critical mass is not normally used to describe this stellar mass threshold. There is also a sense where neutron star and black hole formation processes have critical mass, but that is a topic for a different category on another day.
Why the height of blast furnace is 100ft?
the height of blast furnace is kept high to ensure the completion of reaction.
Successful Use of New Tanning Products?
Tanning enthusiasts enjoy trying new products at the tanning salon they frequent. To avoid incident, precautions should be taken when considering new tanning products. Days leading up to an important event is not the time to try something new. A reaction to the product may occur, resulting in an uncomfortable, unsightly redness to the skin. Testing products on a small patch of skin prior to full body use safeguards against an embarrassing and painful reaction to new tanning products. Practicing patience to ensure there will be no reaction is ideal with any new tanning products.
Do walk in showers tend to leak?
You should find that the shower leaking is comparable. When getting one installed, you should be sure to mention that concern. Extra precautions can be taken to ensure it's minimized.
Early warning signs of storms and precautions to be taken to ensure safety?
Early warning signs of storms and precautions
What are precautions used in SA to ensure that blood products are hiv free?
no.
What is a sentence using precautions?
They took great care to make sure they had taken the necessary precautions to ensure a smooth mission. Some synonyms for precautions are safeguards, provisions, and protections.
What step is critical to ensure that you do not lose important data during installation?
what step is critical to ensure that you dont lose important data during installation
What are the ayurvedic precautions?
There are a couple of ayurvedic precautions. You should be careful with this form of medication and ensure that you are fully aware of the ingredients so that you do get dangerous reactions.
What safety precautions must be taken when administering a stress test?
The precautions for a stress test are actually medical precautions, not safety precautions. The people administering the test need to track blood pressure and heart rate to ensure things don't get out of control.
What safety precautions must be taken administering a stress test?
The precautions for a stress test are actually medical precautions, not safety precautions. The people administering the test need to track blood pressure and heart rate to ensure things don't get out of control.
What are the early warning signs of storms precautions to be taken to ensure safety?
Love u
Can a nuclear option to ensure the defenses of Nigeria be thinkable and with what reasons?
nigeria has no need for nuclear weapons
What is afi 24-301?
The Personnel Reliability Program (PRP) is a program designed to ensure the highest possible standards of individual reliability in personnel performing duties associated with nuclear weapons systems and critical components. It is intended to prevent the unauthorized launch of a missile or aircraft armed with a nuclear weapon, or the unauthorized detonation of a nuclear weapon. Personnel in the PRP must be certified
Which is an action you should coordinate with the APC before you start a permanent change of station pcs move?
Ensure your IBA is placed into a PCS and Mission Critical Status
What precautions must you take when finding the volume of an irregular object?
Ensure you have the right measurment and the calculations are correct
