Boiling water reactorbapi

nuclear energy,nuclear power plant

1. tak BOILING WATER REACTOR (BWR) SYSTEMS By Bapi kumar das

2. Nuclear reactors A nuclear reactor is an apparatus in which nuclear fission is takes place,in the form of a controlled self sustaining chain reaction Which burns fuels like U^235,U^233 or pu^239 and in turns produces many useful products like HEAT,NEUTRONS & RADIOSOTOPS

3. Description of reactor

4. 1.Pressurised Water Reactor A Pressurised Water Reactor ,its Simplest form of water Reactor. is a light water cooled & Moderated Thermal reactor having an unusual core Design

5. INTRODUCTION The boiling water reactor (BWR) is a type of light water nuclear reactor used for the generation of electrical power. It is the second most common type of electricity-generating nuclear reactor after the pressurized water reactor (PWR), also a type of light water nuclear reactor. The main difference between a BWR and PWR is that in a BWR, the reactor core heats water, which turns to steam and then drives a steam turbine. In a PWR, the reactor core heats water, which does not boil. This hot water then exchanges heat with a lower pressure water system, which turns to steam and drives the turbine. The BWR was developed by the Idaho National Laboratory and General Electric in the mid-1950s.

6. Working Of BWR- This is also simplest form of nuclear reactor, Heat is produced by nuclear fission in the reactor core, and this causes the cooling water to boil, producing steam. The steam is directly used to drive a turbine, after which it is cooled in a condenser and converted back to liquid water. This water is then returned to the reactor core, completing the loop. In the Boiling water reactor the feed water acts both as coolant & a moderator.

7. Advantages & Disadvantages Of BWR- Advantages:- 1.Heat exchanger circuit is eliminated & consequently there is gain in thermal efficiency & gain in cost. 2.There is use of a lower pressure vessel for the reactor as compare to PWR which further reduces Cost. 3.The metal temperature remains low for given output condition. 4.The cycle for BWR is more efficient than PWR for given pressure. 5. Operates at a lower nuclear fuel temperature. Disadvantages:- 1.Possibility of radioactive contamination in the turbine mechanism,should there be any failure of element 2.More elaborate safety precautions needed Which are costly 3.Boiling limits power density:onil 3 to5% by mass can be converted to steam per pass through the boiler

8. REFERENCES ----- A Text Book of Power Plant Engineering by R.K Rajput A Text Book Of Power Plant Engineering by P.C Sharma Wikipedia Search Google web search Google image search THANK YOU