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Вы можете ознакомиться и скачать презентацию на тему Safety Fundamentals for NPPs. Доклад-сообщение содержит 37 слайдов. Презентации для любого класса можно скачать бесплатно. Если материал и наш сайт презентаций Mypresentation Вам понравились – поделитесь им с друзьями с помощью социальных кнопок и добавьте в закладки в своем браузере.

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Course: Fundamentals of AES-2006 technology Module 05: VVER (AES-2006) Safety Systems

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Training Objectives Training Objectives

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Content Content

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Safety Fundamentals for NPPs

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Definition of «Safety» Definition of «Safety»

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Definition of «Safety» Definition of «Safety»

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Major Industrial Disasters Major Industrial Disasters

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The organisation operating a nuclear power plant shall be responsible for the plant’s safe operation under all operational states and accident conditions The organisation operating a nuclear power plant shall be responsible for the plant’s safe operation under all operational states and accident conditions Personnel shall be encouraged to perform responsible work, and to identify, report, and eliminate factors endangering safety. Personnel shall be given the opportunity to contribute to the continuous improvement of safety SAHARA principle – safety as high as reasonably achievable

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Design and Safety Functions

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Defense-in-Depth: Five Successive Levels of Protection Defense-in-Depth: Five Successive Levels of Protection

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Physical barriers system Physical barriers system

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DiD Principle DiD Principle

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Design Basis Conditions (DBC) and Design Extension Conditions (DEC) Design Basis Conditions (DBC) and Design Extension Conditions (DEC)

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Acceptance Criteria Acceptance Criteria

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Plant States & Design Basis / Envelope as Consequence of the Requirement of Practical Elimination Plant States & Design Basis / Envelope as Consequence of the Requirement of Practical Elimination

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Level 3 is divided into levels 3a and 3b: Level 3 is divided into levels 3a and 3b: Level 3a includes systems ensuring execution of safety functions during accidents of classes 1 and 2 (DBC-3 and DBC-4) Level 3b includes systems ensuring execution of safety functions under the conditions when level 3a systems cannot perform their functions as a result of common-cause failures, external effects or other complex accident sequences

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Accident management strategy includes: Accident management strategy includes: bringing the NPP to the controlled state bringing the NPP to the safe state Controlled state is the state when the fission chain reaction stops and residual heat is removed from the fuel Safe state is the state when the fission chain reaction stops, residual heat is removed from the fuel and there is no excessive pressure within physical barriers 3 and 4

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Safety systems are designed in accordance with the principles ensuring their reliability and failure tolerance: Safety systems are designed in accordance with the principles ensuring their reliability and failure tolerance: Redundancy principle system redundancy – application of multi-train systems component redundancy – component and equipment redundancy within system trains Independence principle physical separation functional separation Diversity principle application of means based on different principles of operation different physical variables different operating conditions different equipment manufacturers Reliability of safety systems and equipment is provided by the quality of their design, manufacturing and maintenance. It is expressed by their safety class

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Reactivity control Reactivity control

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Supplies boric acid solution with the concentration of 40 g/kg and temperature of at least 20 °C at any pressure in the primary circuit within the range of 0.098  24.5 MPa Supplies boric acid solution with the concentration of 40 g/kg and temperature of at least 20 °C at any pressure in the primary circuit within the range of 0.098  24.5 MPa The system is has a four-train structure. System performance functioning is: 4x33% - functioning in ATWS (DEC) 4x50% - functioning in PRISE (DBC4) The system includes the following: plunger pumps valves pipelines JNK system stores boric acid solution inventory with the concentration of 40 g/l. The design provides for 4 tanks with the operating capacity of 50 m3

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The design provides for the following systems and means to maintain the coolant inventory and to make up the primary circuit: The design provides for the following systems and means to maintain the coolant inventory and to make up the primary circuit: High pressure safety injection system JND Low pressure safety injection system JNG-1 ECCS hydraulic accumulators JNG-2 KBB system pumps

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The system for passive heat removal through steam generators is designed to continuously remove residual heat from the core and cool down the RP to 130 °C in DEC conditions (level 3b). The system for passive heat removal through steam generators is designed to continuously remove residual heat from the core and cool down the RP to 130 °C in DEC conditions (level 3b). The system operates for 72 hours without operator participation during accidents with full blackout and SG feedwater failure. Heat is removed passively through steam lines to EHRT tanks. The system has a four-train structure. System functioning efficiency is 4x33 %

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The primary circuit overpressure protection system includes three pilot-operated relief valves, each consisting of the following: The primary circuit overpressure protection system includes three pilot-operated relief valves, each consisting of the following: main valve relief valves with pipelines cutoff valve spring setting valve additional control line with three successive valves PORV 1 control – actuation pressure: 18.11 MPa. PORV2, PORV3 operating – actuation pressure: 18.6 MPa. Steam is discharged into bubbler JEG