Areva EPR

More documents

Recommendations

Info

SAFETY > NUCLEAR SAFETY page 45 THREE PROTECTIVE BARRIERS page 45 DEFENSE IN DEPTH page 46 > <strong>EPR</strong> SAFETY page 47 Golfech 2, France (1,300 MWe): reactor pressure vessel and internals. DESIGN CHOICES FOR REDUCING THE PROBABILITY OF ACCIDENTS LIABLE TO CAUSE CORE MELT page 47 DESIGN CHOICES FOR LIMITING THE CONSEQUENCES OF A SEVERE ACCIDENT page 50 44 I
NUCLEAR SAFETY The fission of atomic nuclei, performed in reactors to generate heat, brings into play large quantities of radiation-emitting radioactive substances from which people and the environment must be protected. This explains the need for nuclear safety, which consists of the set of technical and organizational provisions taken at each stage in the design, construction and operation of a nuclear plant to ensure normal service, prevent the risks of an accident and limit its consequences in the unlikely event of its occurrence. Nuclear reactor safety requires that three functions should be fulfilled at all times: • control of the chain reaction, and therefore of the power generated, • cooling of the fuel, including after the chain reaction has stopped, to remove residual heat, • containment of radioactive products. It relies upon two main principles: • the three protective barriers, • defense in depth. The three protective barriers THREE PROTECTIVE BARRIERS The concept of the “three protective barriers” involves placing, between the radioactive products and the environment, a series of strong, leak-tight physical barriers to contain radioactivity in all circumstances: • first barrier: the fuel, inside which most of the radioactive products are already trapped, is enclosed within a metal cladding, • second barrier: the reactor coolant system is housed within a metal enclosure which includes the reactor vessel containing the core constituted by the fuel within its cladding, • third barrier: the reactor coolant system is also enclosed within a high-thickness concrete construction (for the <strong>EPR</strong>, this construction is a double shell resting upon a thick basemat, whose inner wall is covered with a leak-tight metal liner). † The resistance and leaktightness of just one of these barriers is sufficient to contain the radioactive products. Steam generator Pressurizer Reactor coolant pump Control rod drive mechanisms 3 2 1 Fuel assembly Reactor pressure vessel 1 Fuel cladding 2 Reactor coolant boundary 3 Reactor containment I 45
Page 1 and 2: EPR
Page 3 and 4: • EDF (Electricité de France), a
Page 5 and 6: FOREWORD Security of energy supply
Page 7 and 8: TABLE OF CONTENTS page 08 page 44 p
Page 9 and 10: EPR LAYOUT page 10 >PRIMARY SYSTEM
Page 11 and 12: Water outfall Switchyard Water inta
Page 13 and 14: 2 t +8.50m 1 2 3 4 5 6 1 2 8 6 1 5
Page 15 and 16: CHARACTERISTICS DATA Reactor coolan
Page 17 and 18: In-core instrumentation 12 lance yo
Page 19 and 20: 17 x 17 fuel assembly CHARACTERISTI
Page 21 and 22: Plug connector Upper limit position
Page 23 and 24: Reactor pressure vessel and interna
Page 25 and 26: Heavy reflector The heavy reflector
Page 27 and 28: Steam generator cutaway Secondary m
Page 29 and 30: Reactor coolant pump cutaway 1 2 3
Page 31 and 32: CHARACTERISTICS DATA Main coolant l
Page 33 and 34: CHARACTERISTICS DATA Pressurizer De
Page 35 and 36: SAFETY INJECTION / RESIDUAL HEAT RE
Page 37 and 38: OTHER SAFETY SYSTEMS The Extra Bora
Page 39 and 40: FUEL HANDLING AND STORAGE The react
Page 41 and 42: Computer-generated image of the EPR
Page 43: Limitation functions and protection
Page 47 and 48: EPR SAFETY The first important choi
Page 49 and 50: Optimized management of accidental
Page 51 and 52: The dedicated corium spreading and
Page 53 and 54: EPR CONSTRUCTION TIME SCHEDULE The
Page 55 and 56: PLANT OPERATION, MAINTENANCE & SERV
Page 57 and 58: Operators have developed ambitious
Page 59 and 60: EPR Key to power station cutaway 1

Areva EPR

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?