TW218930B - - Google Patents

Description

Printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 218930 A6 __B6_ V. Description of the invention (1) Yeming Fangbeilu The traditional design of nuclear power plants has reached a long-term, safe and reliable principle. To ensure safety, the various systems and procedures incorporated in the power plant represent the results of a careful study of anticipated emergency situations. Attention should be paid to theories or premises in design. For example, it may include the redundancy of the design. Due to the continuous accumulation of nuclear power plant operating experience, this redundancy has been questioned by the latest rationale. Therefore, those who study nuclear power generation do not "have been called for the development of an improved operational analysis model to find out the limits of the improved embedding factor, and further improve the safety due to changes in safe and operational regulations." Since it takes a long time to develop or construct a new nuclear power generation unit, for example, it takes ten or more years in this kind of effort, and given that there are countless nuclear power generation facilities in operation, these researchers It was also required to amend the long-standing facilities to meet the new burial requirements. It is very expensive to install newly developed things into the old reactor. The power supply needs to be modified. * The main valves need to be replaced. The nuclear energy industry has evolved into a variety of reactor types. There is a wide range of users of this type of reactor. During operation, the steam that drives the floating wheel is generated in the core of the reactor, which is called the boiling water reactor (hereinafter referred to as BWR). The water heated by the BWR reactor not only becomes The working fluid is also the source and cocoon of the reaction, together with other parameters * making it suitable for supply and use in the reactor system * must be a safety requirement, or a government control unit such as (US) nuclear energy The Regulatory Commission (NRC for short) defines the subject of the regulation. Generally, the general structure of the BWR system will include an upright reactor pressure vessel, which includes a lower ellipse core structure, and the bottom is the control rod drive (please read the note of the melodrama).莨) This paper scale applies the Chinese National Standard (CNS) A 4 specifications (210 X 297 mm) 81.9.20,000 218930 A6

Bf. V. Description of invention (2) Action. Above the core of the reactor, there are the steam and water engraving device assembly and a steam refining device assembly in the steam outlet. Around the reactor is a shielding wall, and outside the shielding wall is a dry well suppression chamber (wet well). The turtle-shaped system is located below and covers the dry well. In a more typical BWR facility, the water coolant is heated at the core of the reactor and rises into a two-phase mixture of water and steam in the reactor pressure vessel. The two-phase mixture then passes up through the steam separator assembly and steam dryer structure and enters the steam line leading to the steam turbine. After passing through the steam turbine, the steam is condensed into water, which is condensed by the relatively large feedwater system and fed back to the reactor. The feed water enters the downflow zone of the reactor and mixes with the water returning from the steam separator and drying. The water in the downflow zone is circulated back to the reactor core through a vertically oriented recirculation pump. The recirculation pump directs the water flow to a vertical jet pump located between the core side plate and the vessel wall. In a typical way, this recirculation function uses two distinct recirculation circuits and corresponding recirculation pumps. Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (Jing " " " the back of the matter will be written again w) When encountering some form of cracking or deviation and giving birth (called cooling loss accident referred to as L0CA) The designer expects that water with higher temperature and higher pressure in the reactor will start to lose. Therefore, it will use various safety systems and procedures to block and control the LOC A thermally. In terms of thermal control, the safety design understands that although the loss of Shuiyuan and the agent has terminated the core reaction and eliminated the possibility of a nuclear accident, the power of the heat generated or the residual energy in the reactor is still large enough to require cooling Control to avoid core melting. Generally speaking, the amount of water in the enclosure is more than enough for this purpose, for example, the water contained in the pressure suppression tank plus the condensation storage. Use this water coolant for safety purposes, 2_ · _ · 4 ~ = «____ The paper scale is applicable to the Chinese National Standard (CNS) A 4 specifications (210 X 297 mm> 81.9.20 000 218930 A6 B6 V. Description of the invention (3) (Clear t: t1.-vi on the back of the; i & matters and write this page) There are a variety of safety-related technologies and the emergency core cooling system (hereinafter referred to as ECCS) has been successfully developed and can withstand L0CA. For example, the core injection system (CS) system and low pressure injection (LPCI) facilities have evolved in various configurations. The L PC I system, for example, uses four pumps and is released by the safety system when it encounters a cooling water loss situation. When the loss of the agent reaches a sufficient level and the force of the pressure tank is still very high (for example, when the small pipeline is damaged), the automatic safety system will depressurize the reactor tank, allowing the lower pressure feed water to work, M will introduce water Reactor. Because the self-circulation system is used for this purpose according to the ideal structure as explained earlier, it is usually used by the LPCI system, and the water is introduced in the case of ECCS. Printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economy. • Previous security settings It is considered that in the case of L0C A, the recirculation circuit will be disconnected. Therefore, under this LOC A condition, pumping water into the circuit may be ineffective. Therefore, the LPCI system is equipped with a recirculating wine road selection feature, each, The circuit selection logic 〃 M avoids this situation. This safety control detects a broken recirculation loop and initiates a procedure that uses the appropriate LPCI injection valve to inject water into the redundant, undamaged recirculation loop. Use The experience of this type of LPCI road selection feature shows that it is very complex, and it is not easy to test and maintain. In the case of the recent requirements according to the regulations, the design must account for the occurrence of valve failures. However, under the current regulations, it is necessary to be more The method of effectively exerting the function of adding new things to the existing design cells and updating them is cumbersome and costly, because it involves work such as electrical fiber replacement and spring connection. Therefore, researchers have been looking for One method • Opportunities available to operators without the need for loop selection and editing systems and the associated costs, but can still improve the reliability of the LPCI system. ............ ~ 5 «~ 81.9 .20,0 00 The size of this paper is in accordance with Chinese National Standard (CNS) A4 specifications (210 X 297 Gongmeng) 218930 A6 5. Description of the invention (4) (Read the notes on the back of ``! '-' 'First, and then write (This page) This invention is based on an LPCI system and method * K prepared to modify the injection circuit to achieve effective water-cooled boiling agent injection in the recirculation circuit of a traditional boiling water reactor, but without relying on complicated circuit selection. This procedure is to understand that one of the recirculation circuits has broken or broken, and to control the speed and amount of coolant injected into each recirculation circuit at the same time. Using a method such as copying, the time required to complete the injection of the coolant, and the amount of fluid required for injection, through the analysis of the needs of the LPCI system, the flow rate at the time of injection can be calculated, and it is determined and recognized as necessary The amount of coolant allows the LPCI treatment to be controlled by simply using a flow rate to control the water resistance in the coolant injection conduit. These water resistances can be made with conventional flow restriction holes. The size and shape of the flow restriction holes can determine the required flow rate, or the throttle effect of the valve in the injection pipe can be used to achieve the same result. In this process, the cross-connecting conduit and the related cross-connecting valve that were originally used for the injection selection before recirculating loop cooling have no effect 'and only maintain an open condition. Under the new law and system, the LCPI amendment does not rely on encountering roads. The complex hardware and instrumentation that were originally required, and the “hardware disturbing” circuit or pipeline are rarely reset. Printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. Another feature of the present invention is to provide a low-pressure coolant injection system 'used in various nuclear power generation cells, which has a boiling water reactor' with a reactor core and normal connection Turning pressure, the first and second recirculation circuits (including the respective first and second recirculation pumps and actuatable discharge valves) 'a pressure-suppressor water source, a condensed storage eaves' and a corresponding coolant A safety system that produces a safety output in the event of an accident. This system includes the first and second low-pressure coolant injection pumps, with suction inlets and discharge outlets and can be pumped by water 81.9.20,000 This paper size is applicable to China National Standard (CNS) A 4 specifications (210 X 297 mm) 218930

Afi ΒΓ, Fifth, the description of the invention (5) (Read the note on the back of 4-Matters and then write this page). There is a water supply pipe configuration, and the first and second low-pressure coolant pumps are connected to the pressure suppression pool by means of circulation. The first and second coolant injection pipes are coupled to the first and second low-pressure coolant injection pumps, and lead to the respective first and second recirculation circuits. The first and second water resistance components in the respective first and second coolant conduits are used to restrict the flow of water coolant therein to a predetermined flow rate. This flow rate is selected to send a predetermined maximum water cooling Agent to each of the first and second recirculation loops. The choice of flow rate is effective in the emergency cooling effect of a coolant injected into the conduit and the core of the reactor. There is a control configuration that can activate the first and second low-pressure coolant injection pumps in response to the safety output. Another feature of the present invention is to provide a method for injecting low-pressure cooling water into a boiling water reactor of a nuclear power generation facility. The nuclear power generation facility has an emergency core cooling water source and first and second independent recirculation loops ( Under normal circumstances, water is circulated through the reactor core to generate steam), and a safety system that can respond to the accident of cooling water loss to produce a safe output, using M to cause at least a predetermined amount of water coolant to be supplied to the reactor, Contains the following steps: Provide the first and second water flow paths from the water coolant source to the respective first and second recirculation circuits; Provide a low-pressure coolant injection pump that can be activated to pump water from the water source through the first The first and second water flow paths; printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs to provide a valve configuration that can be induced from the closed state to the open state, using K to cause flow in the first and second water flow channels; The valve configuration is triggered by the safe output. Μ allows the water coolant to be at 81.9.20,000 at the same time. The paper standard is applicable to China National Standard (CNS) A 4 specifications (210 X 297 public dreams) 218930 A6 Bfi Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Invention description (6) Flow in each of the first and second water flow paths; due to safe output, each low-pressure coolant injection pump is activated; K and limit the cooling water flow in each of the first and second water flow paths to a predetermined fluid flow rate, which is selected to deliver a predetermined amount of water cooling surface to each of the respective first and second For independent recyclers, the front flow rate is selected to effectively achieve emergency cooling of the reactor core from a water flow source. Another feature of the present invention is to provide a low-pressure coolant injection system for various nuclear power generation facilities In such facilities, there is a boiling water reactor with a reactor core and normal operating pressure, first and second recirculation circuits (including separate first and second recirculation pumps and actuatable discharge valves) , A water source for suppressing the pond, a condensate storage tank, and a safety system that can produce a safe output due to the accidental K loss of the coolant. The system includes first and second low-pressure coolant injection pumps with suction and discharge ports and actuatable K pump water. Equipped with water supply pipe configuration, K fluid circulation method, coupling the first and second low-pressure coolant injection pumps to the pressure suppression tank, and further containing a cross-connected pipe configuration, using M to selectively interconnect the first and second low-pressure coolant injection The discharge port of the pump. The first and second coolant injection conduits are coupled to the respective discharge outlets of the first and second low-pressure coolant injection pumps * and open to the respective first and second recirculation circuits. The first and second low-pressure coolant injection valves are provided in the respective first and second coolant injection conduits to be activated between the closed and open positions. The first and second coolant injection conduits are further provided with first and second water resistance devices, K restricts the flow of cooling water to a predetermined flow rate, which is selected to change a predetermined flow rate Amount of water coolant is sent-? T " · ". '· &Quot; ·! :: ·· 1-item replay,' " this page) This paper scale is applicable to China National Standard (CNS) A 4 specifications ( 210 X 297 Gongchu) 81.9.20,000 218930 A6 B6 V. Description of the invention (7) To each of the first and the first recirculation buried roads, the flow rate is from a coolant injected into the conduit to effectively achieve the core of the reactor Emergency cooling. There are interconnected valve devices in the interconnected ducts • Can be activated between the open and closed conditions • Μ Select the output of the first and second low-pressure cooling cocoon injection pumps to meet the selected first and second coolant injections, etc. The tube leads to one of the first and second recirculation circuits. Equipped with a control device, this device can be safely ejected, W actuates the first and second low-pressure coolant injection pumps * and the first and second low-pressure cooling surface injection valves, Μ and keeps connected when the safety gun is out Under the opening regulations, the device can be seen in the branch 9 of the meeting. The status of the situation is as follows: Sister M looks at the piece of Yuan Yuan. Attached to the example of the configuration of the configuration, please say that, «The written structure of the method is the same as Fang Jun, and the basic system of the distribution of the distribution of the Shitou is clearly explained, and the distribution and the subdivision are filled separately. The gigantic and qualitative clarification of the BL under the flj Η suspicion; the show of the way is buried in the ring, and the ring is rebuilt. The two kinds of R8 and the building of the container are reversible. 1 1 is 1 2 Figure _ The standard injection product printed by the MK Industrial Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs but cold-pressed has a unique color and text; The injection system of Shiluyuyu split into 1 was cold pressed. The low picture of the first series of Shi Mingming's design theory, sub-controlling the nuclear male is the positive 4 Xiu Ming Yuan Ruen Note (Note) 1 notes on the back of the book and then write this page)

Each paper size applies to China National Standard (CNS) A4 specifications (210 X 297 mm) 81.9.20,000 218930 A6 B6 V. Description of invention (8) (please refer to the back of the '-'; '; 1-Mc item (Let's write this page again) The Low® Coolant Injection System (LPCI) is bound to work with some nuclear water-generating facilities, such as the plugging system of some nuclear power generation facilities. Refer to _1, an enclosure or reactor building is shown roughly in 10. The inside sign is a wall 12 having a floor 14. Inside the building 10 is a reactor bracket 16. This bracket is a part of a biological shielding wall 18 which is one of the reactors 20 which is a pressure vessel of a BWR. A dry well is shown at 22 places, enclosed and limited by a net structure, namely the wall 23. A pressure suppression chamber, or wet well, is shown at 24 places, surrounding the dry well 22 in a turtle shape. About half of this pressure suppression chamber 24 is filled with M water * Μ 蒯. A pressure suppression pool 26 is fixed.-The venting system connects the dry well 22 to the pressure suppression tank 26 of the trickle well 24. The dry-well to wet-well ventilation represented by the main ventilations 28 and 29 extends from the dry well 22 to the suppression chamber 24, and the respective venting heads 30 and 31 connected to the space of the suppression chamber 24 can be seen. The downcomers are at 32 and 33 and extend from the respective headers 30 and 31 and terminate under the water surface of the pressure suppression tank 26. In case of failure of the high-energy nuclear steam supply system (NSSS) pipeline in the dry well 22, the water and / or steam from the reactor will be discharged into the atmosphere of the dry well 22 to cause L0C Α. As a result of increasing the pressure of the dry well, the mixture of atmosphere, steam and water in the dry well will be forced to pass through the ventilation including the main ventilation 28 and 29 into the well 26 maintained in the suppression chamber 24. This water vapor will condense into the suppression tank 26, thus limiting the internal resistance pressure, which cannot be condensed to dryness and the atmosphere will be transferred to the suppression chamber and stored therein. Printed by the National Bureau of Standards of the Ministry of Economic Affairs, the Negative Work Consumer Cooperative. The secondary damper, the reactor building 10, may further include features such as rooms in the reactor building such as 34 and 35M and fuel replacement floor 36. Between rooms 34 and 35 is the portion of spent fuel storage pool, as shown at 37 and 38. Not shown above and those located far away are condensate storage (CST). -1 η -___ This paper is again applicable to the Chinese National Standard (CNS) A 4 specifications (210 X 297 mm) 81.9.20,000 218930 Α6 Β6 Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Description of invention (9) As seen on Μ, the pressure suppression tank 26 is a tool for condensing any water vapor released into the dry well during the LOCA; for the hot standby to be transferred to the gang to change the heat directly from the pipeline to the residual heat removal (RHR) reactor during heat exchange Radiator for core thermal insulation cooling system; radiator for nuclear system pressure relief valve; and water source for ECCS. This suppressor is also a radiator under normal operating conditions. During the expected transition period of the reactor, the discharge through the main steam release valve is directed to the squeegee, or the steam is discharged through a quencher at the end of the discharge line and condensed. Referring to Fig. 2, an extremely schematic circle set as a recirculation part with the reactor vessel 26 is set. The vessel 20 is shown to include a reactor core 44 composed of a fuel assembly extending in a matrix between the core plate 46 and a top guide 48. The core 44 is composed of a control rod conduit assembly 50 Controlled by each control rod. The control rod drives the hydraulic line and the motor to meet the bottom of the container 20 as shown at 52. Surrounding the core 44 and the control rod guide assembly 50-part of which is a bucket-shaped enclosure 54 whose function is to guide the circulation of water coolant in the container 20. At this point, the water system is forced to flow down the circle between the circular plate 54 and the container 20 (downflow zone), and then is directed upward through the core 4 in a substantially constant manner. FIG. 2 particularly schematically depicts the implementation of the reactor water recycling system of the LPCI modification M of the present invention. The function of this system is to circulate the required cooling agent and the agent through the reactor core. This system is outside the reactor vessel and is composed of two loops or zones generally shown at 56 and 57, and for each loop there is a spring inside the dry well 22, shown at 58 and 60, respectively. The pumps 58 and 60 are manufactured together with a wide range of wide-body parts directly coupled with water-cooled motors. For simplicity, the diagram (see the notes on the back side and then write this page) ^ • Τ This paper size applies to the Chinese National Standard (CNS ) A 4 specifications (210 X 2Θ7 mm) 81.9.20,000 GΛ »外 Γ / 号 费. 利 应用 常 —Α6 71 ^ ά218930 ^ V. The description of the invention (π) is shown as a recirculation discharge valve shown in 62 and 64 and the respective suction or pop-off valves 66 and 68. Generally speaking, the redundant recirculation circuits 56 and 57 allow circulating water to flow through the core 44 and draw from the ring or the downflow between the core wall 54 and the wall of the container 20: about three-thirds One of the core water streams is taken from the container 20 through the recirculating wine paths 56 and 57. In these circuits, the water flow is pumped to a higher pressure and distributed through a manifold (multiple lines (not shown) are connected through this manifold) and returned to the container 20, after which it is directed to the -sequence jet Pumps, two of which are shown at 70 and 72: When the water flow is directed to the initial stages of these jet pumps, the surrounding water in the dewatering zone is drawn into the jet pump throat due to power exchange, where the two flows are After mixing, the mixed flow is introduced into the aeration portion below the reactor vessel 20. The water flow then flows upward to meet the core 44 for heat exchange. The water supply system joins the system through the choke located above the ring of the dewatering zone and combines with the dewatering water. The low-pressure coolant injection function (LPCI) is part of the residual heat removal system (RHR >). In the case of LOC A, it will function to inject water through the loop 56 and 57 into the core of the inverter. Choose this cooling The method of inputting the coolant is so that the circuit will instinctively place this emergency coolant in the correct place in the container 20. Under this coolant loss condition, the 1, OOOps i (for example) in the reaction container 20 is normal Part of the operating pressure will be released (because of the uncoupling at that time) and pass through the decompression system: when this happens, the four core LPCI pump casings of the emergency core cooling system will be moved. These pumps are not used for LPCI, but also It can be used as cooling water M in the pressure suppression tank 26 and other RHR system functions (such as spraying cold plugs in the plug, spray cooling M in suppression and shutdown cooling). However, when the self-signal requires LPC 1 to work . -12-

(Please read the precautions on the back before filling in this page) A 4 (210X2971 '«) 218930

Αβ BG Printed by the Consumer Labor Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Description of the invention (11) It is dedicated to the injection of water in circuits 56 and 57 as shown by the arrows 74 and 75 in the respective worms. Therefore, the coolant can be injected at 74 and 75 simultaneously from the condensate storage tank (not shown) of the pressure suppression tank 26 and the existing water source of the facility 10. However, in the M system, it is necessary to adapt to the regulations or conditions. Under this condition, it must be assumed that one of the circuits 56 or 57 is broken. Therefore, a logic selection valve is added to select a circuit that can still be used for LPCI applications. As mentioned above, this requirement is the need for highly complex control and water diversion plans. Please turn to Figure 3, this is a schematic representation of the open circuit injection correction (SLIM) used in existing low-pressure cooling injection systems in some nuclear power generation facilities. In this plaque, the inverted container 80 is in a dry well defined by a wall or structure 82. The dry well area also shows the recirculation loop identified by the earlier numbers 56 and 57. These circuits, like the M-series K, exist redundantly and contain separate pumps 58 and 60, suction valves 66 and 68K, and discharge valves 62 and 64. The K-shaped section below which surrounds the dry well boundary 82 is a turtle-like shape is shown roughly in the pressure suppression tank and is connected to an emergency core cooling system (ECCS) header 86 located in the shield building. The downcomer 88 extends from the dry well wall 82 to the pressure suppressor 84 to guide the liquid and steam released therein. Now looking at the low-pressure cooling injection (LPCI) components, the suction inputs of the two pumps 90a and 91a are connected to the ECCS header 86, and to the pressure suppression pool 84 via lines 92a and 94a. A motor-operated side valve is connected to each input, as shown at 96 a and 98 a, respectively. Under normal circumstances, valves 96 a and 98 a are open. In addition to the ECCS header 86, the pipeline 94a should be coupled to the condensation storage represented by the block 102 via the pipeline 100a. Storage 102 is usually installed a little further in nuclear power plant facilities, and for this paper, the Chinese National Standard (CNS) A 4 specifications (210 X 297 cm • 8) 81.9.20,000 218930 Λ6 [«; V. Description of the invention (12) (Qing Shu Qin " Back ', 1! ≫ / Note to Mang Xiang Zai. &Quot;' this page) For the LPCI system, it represents a standby water source. The output of the pumps 90a, 91a is passed through the respective pipelines 104a and 106a to meet a heat exchanger bypass valve 108a, and when the valve 10δa is opened, it is led to the pipeline 110a. The water flow from the duct 110 a is guided to the duct 116 a, and the flow is controlled by a restrictor orifice 118 a or equivalent water resistance, from here to the duct 122 a through an open LPCI valve 120 a . When valve 124 a opens K and especially valves 128 a and 132 a are closed, the cooling flow is injected into the recirculation channel 56 downstream of the discharge valve 62 through the guide pipe 136 a. After this situation, the discharge Que 62 was shut off. From the injection position M of the line 136 a and the closing of the discharge valve 62, it is assumed that the recirculation line will break. When the pressure suppression tank needs to be cooled without accidents • Valves 90 a and 91 a are dedicated to The heat exchange circuit works, closing the valve 108 a, and bypassing the fluid from the pressure suppression tank 84 and the header 86 to the heat exchanger 114 a through the conduit 112 a. After cooling, the liquid flows from there to the duct 110a. In the event of cooling of the pressure suppression tank, this fluid will flow through the pipeline 110a to conduit 116a, and from there through an open LPCI injection valve 120a to conduit 126a. For these normal conditions, the LPCI injection valve 124 a in the next series configuration will close K to reach the cooled fluid to meet the conduit 126 a, the cooling valve 128 a, the line 130 a, the series coupled cooling valve 132 a and the line 134 a and sent into the suppression pool at 84 places. Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. At the 84 places in the pressure suppression tank, high pressure will be experienced. This high-pressure situation will be caused by steam, so pumps 90a and 91a can be used to exercise the quenching effect. Que at this point, it can be seen that the catheter 140 a 14 ~ 81.9.20,000 The paper size is applicable to the Chinese National Standard (CNS) A 4 specifications (210 X 297 mm) 218930 Αβ Printed by the Employees Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs Description of the invention (13) extends from the conduit .110 a to the first suppression tank injection valve 142 a, the output of this valve in line 144 a is coupled to the next series suppression tank injection valve 146 a, and from then on From catheter 148 a to whip 150 a. The same form of quenching or spraying can be used when a high-pressure situation occurs in a block inside the wall 82. This kind of quenching will play a role in protecting the pressure boundary of the whole park blockage strategy under the circumstances of accidents. Therefore, it can be seen that the duct 110 a extends to a resistance valve 154 a, and the output of this valve at line 156 a is for the next series connection resistance fog valve, and from then on through the parallel line 160 a and 162 a to the pair of spray nozzles 164 a and 166 a. The LPCI component described on the recirculation circuit 56 at M basically works symmetrically with the corresponding component of the recirculation circuit 57. Such common parts are identified by adding the suffix M and 'a " to the description of circuit 56 on M. Therefore, it is used for recirculating the wine road 57. The common parts are identified by the same number and the suffix '" b 〃 in this figure. In each case, the dual or redundant system is combined with ECCS header 86, suppression tank 84 and condensation storage (CST > 102-work, and the description of reclaimed buried road 56 on Μ Used for the same parts of the recirculation circuit 52. One of the special features of the LPCI system in the circle is the interconnecting pipeline represented by the conduit 170 a, the interconnecting valve 172 a, the conduit 174 * the interconnecting valve 172 a and the pipeline 170 b. This interconnecting pipeline It has been used for various purposes in the earlier system, including transferring the water flowing from one side of the redundant system to the other. Without such control or without the characteristics of this system and method, the water under pressure is injected under this system It will take the path of least resistance out of the broken recirculation loop and lose its effectiveness in the undamaged loop. The present invention wipes out all the complexity of the previous control system. Under the arrangement of the present invention '{谙^ Read: -Notes on the back & write the page again) This paper scale is applicable to the Chinese family standard (CNS> A4 specifications (210 X 297 mm) 81 · 9 · 20,000 218930 A6 H6 V. Description of invention ( 14) (Clear " Read-Select Noodles to Remember Date Items (Re-write the book) The cross-connect valves 172 a and 172 b are kept open. Correspondingly, the sizes of the openings 118 a and 118 b are selected to limit or control the flow of coolant to a predetermined amount of water coolant At the same time, the flow rate is sent to each independent recirculation loop 56 and 57. This rate can effectively complete the emergency cooling of the reactor core 80 within the required time limit. By using water in each flow restriction hole 118 a- 118 b The flow rate established by the resistance is based on the knowledge of: ⑻ the amount of fluid required to complete the necessary LPCI cooling of the reactor core 80, and (b) the time available to complete the emergency cooling. Under analysis, this There will be a sufficient amount of water to complete this task, because the water system in the pipeline that broke into one of the recirculation channels 56 or 57 is discharged into the dry well, where the coolant finally flows into the vent, through the dry The well depressurization zone returns to the suppression pool. Therefore, a simple correction technique is provided, and the existing BWR facility can be corrected immediately with Μ, and the hardship affected by the correction is also very small, and there is no need to reset the line. , There is no need for extensive pipeline changes Hand Mine. In fact, the LPCI technology of this amendment is a bit negative. This improved technique is called ", Open Wine Road Injection Amendment" (SLIM). Printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. Please refer to Figure 4. Shown is an LPCI SUM logical circle. In the discussion under Μ, the common parts of the current system are represented by the suffix * a " or '〃recognizer only K-related numbers. The parenthesis 190 indicates that the safe output condition and the corresponding start signal are generated in the sensing parameter. In this regard, as represented by the logically illustrated position 192, a low water level can be detected in the reactor 80. This situation can be caused or, as indicated by position 194, the high pressure of a dry pond can be detected. These two situations represent the detection of the coolant loss accident (L 0 C A). After the investigation, it is as shown in the table 81.9.20,000 of the respective lines 1 9 6 and 1 9 8 This paper size is applicable to the Chinese National Standard (CNS) A 4 specifications (210 X 297 public dreams) 218930 A6 B6 Central Bureau of Standards of the Ministry of Economic Affairs Printed by Employee Consumer Cooperative V. The description of invention (15) shows that the control logic proceeds to position 200, in which a spare diesel engine is turned on to mobilize the motors and control the valves used in the system. Power supply used by Yuda or electric drive sub-components. This circumscribed area is shown in the box and bracket 202 to enable the valve and pump motor to have power, and to achieve, permit, and "standard" purposes. In the latter case, for the reactor 80, decompression or necessary The generation of low pressure P1 and P2. After the power of the diesel engine is started, as indicated by the lines 204 and 206 to the respective positions 208 and 210, it is determined whether the bus (supplied by M) with electric power has an electric chip in the recognized LPCI Pump 90 · 91 and valves at 120 * 124 and 126 and 62,64. Then, as indicated by line 212 and position 214, it is determined whether the LPCI injection pumps 90, 91 are powered. At the same time, as shown in line 216 and position 218, the LPCI injection valves 120 and 124 are energized. In addition, as indicated by line 220 and position 222, it is determined whether there is electricity at the discharge valves 62 and 64 of the respective recirculation channels 56 and 57 at this time. The requirement for powering LPCI injection valves 120 and 124 represented by position 218 is subject to exceptional conditions. As indicated by lines 224, 226 and position 228, the pressure observed in the reactor 80 must fall below a predetermined low pressure p. The pressure may range, for example, from 300 psi to 400 psi. In this regard, the injection valves 120 and 124 are only allowed to work when there is a certain pressure difference between the two. Another allowable condition disclosed in the box and brackets 20 2 in this rationale is at position 230, where it is determined whether the pressure of the reactor is less than the pre-specified pressure P2, and the value of P2 is less than the value of P1, for example About 200psi, if this condition is met, the logic continues as shown by line 232. (^^ 开 ^ 诨 曲 之 ^^ &^; ^ Yucheng, write a copy ") This paper scale is applicable to the Chinese National Standard (CNS) A 4 specification (210 X 297 mm) 81.9.20,000 218930 A6 Bfi Central Standard of the Ministry of Economic Affairs Printed by the Bureau Staff Consumer Cooperative V. Description of the invention (16) Then, proceed to the area represented by the square and bracket 234 for the start of the pump and valve. Those who draw further attention are the vertical classification of the anatomy. For example, squares and brackets 2 36 represent the respective recirculation loops 56 and 57-the area where the LPCI pumps 90 and 91 are activated, and squares and brackets 238 represent the vertical of the IW at the injection valve 120 * 124 opening the logical illustration The area, the square and the bracket 240 represent the closing of the discharge valve 62. It should be noted that * Once it is determined that there is power supply for the pumps 90 and 91 represented at position 214, then as shown by line 242 and position · 246, the LPCI pumps 90 and 91 are available for rated water flow. This means that the pump's work has been high to the rated speed. At this time, in terms of water flow, it is the M's rated capacity to deliver water. The control conditions need to reach full flow before assuming that the L PCI system can cope with LOCA. Now it is expected that the LPCr injection valves 120 and 124 are powered, and the pressure permission condition represented by position 228 is satisfied. When these two situations occur jointly as shown in the " and 〃 line and 250, the logical flow continues as line 252 And the position 254 indicates that the LPCI injection valves 120 and 124 are open. For the same reason, the discharge valve 62 * 64 must also be closed as indicated by position 256 in the vertical zone. The closing of the discharge valves of the recirculation circuits 58 and 60 assumes that the rupture of the recirculation circuit will be on the suction side of the recirculation pumps. Therefore, the injection water of the LPCI system is directed to the discharge side of the pumps 58, 60 and the corresponding discharge valves 62 * 64 ^ Finally, a necessary condition is that the conditions indicated by the illustrated positions 246, 254, and 256 should occur jointly. Due to the system and method on M, some kind of correction can be made without departing from the scope of the present invention. Therefore, all those included in the above description and shown in the drawings should be considered to be releasable. Unlimited meaning. «—, —„ 18- This paper is again applicable to the Chinese National Standard (CNS) A 4 specifications (210 X 297 mm) 81.9.20,000

Claims (1)

i Succeed in gaining employment.-Xi Yu's patent application: § Xiu Wangyi (April P) AT B7 C7 D7 6. Application for special issue model a218930 1. A low-pressure cooling system used by a variety of nuclear power generation companies _Injection system, such facilities have a boiling water reactor, the reaction core has normal operating pressure, the first and second recirculation circuits of the facility include separate first and second recirculation pumps and startable For each discharge valve, the facility has a water source for the pressure suppression pool, a condensation storage tank and a safety system that can produce a safe output in response to coolant loss accidents. The low-pressure coolant injection system contains: first and second low-pressure coolant injections Human pump with suction input and discharge output • Can be deactivated to irrigate water; water supply conduit device for coupling the suction input of the first and second low-pressure coolant injection pumps with the pressure suppression tank Fluid flow traffic (please read the precautions on the back and then this page) The Central Standards Bureau of the Ministry of Economic Affairs has printed ii · Before the cold, the cold flows into two. And, two The first limit, guide the unified first and the flow of the way into the Shitou and pass the water to the pre-notes into the first one, each note before the first, the agent will move the agent before the cold road However, the cold setting of the front coupling and the ring selection of cold and different water are described by the pressure and the mouth: the previous. The output is low, and the guide in the Chinese system is yet complete. Rate two from the front of the cold safety item, back to the volume, the first statement of the first effect. The first agent should be installed according to the requirements of the pump, but the resistance will be blocked again. The first diversion to the first delivery and the delivery to the first delivery is the antidose cold application of the first dosing agent rate and the suppression data, and the first is the low pre-control of the first dose:. A 4 (210X 297 gong) A: 218930 c? DT VI. Applying for the patent model ® and the change to the first position of the first one, respectively, the opening and closing of the valve is closed, and the valve can be inserted and injected. j Official cold lead pressure into the second injection of the low-injection second but the first one of the cold first and second second, the position is the same as the original Μ open 'before the statement is lost to the full action safety before the valve should be injected into the agent. However, the cold loading pressure and the control of the low K are set; before the first move and 3, the pre-synchronization, sometimes the power of the Shitou is injected into the current pressure injection table, and the cold of the device transported by the table transfer agent should be reversed at normal pressure. The front item of water boils in CN1, and the pre-value of Shu Xiao is surrounded by its range, but it is favored. For the exclusive package, please make the root of the pre-pressure data of Shen Control Ρ1. Choose the candidate. Note two valve agent first entry and cold injection first agent pressure but low and cold pressure-containing items are set low 1 before the first block resistance, please move back to Fan Qililai, please return the application if there is a report R1 is the first item in which the injection agent is cold but the cold pressure is low. Shen Kong according to the flow of the second and the first valve of the first wu fcF, each of the description and the former is its tube and guide into the anti-agent, but the front is cold in the second coupling and the first cycle of the loop Let's go back to Section 1. Presence Φ—Open the 'M' of the closure, close one, and lose to the full. The valve is placed 11 hF. The above should be based on the previous reasons. Please fill in the items {= r this page) k. • hit. 6 Chinese style of its water 'boiling general description before the injection, but it is set at the cold storage pressure P2 and the low-pressure pressure item 5 is expected to be included in the range. Lizhi special equipment, please make the application and control according to the pre-transit route back to Changhuan, follow the re-statement of the second and the first one, and the value of P2 before the dynamic pressure setting should be pre-returned to the beginning. The stress counterpressure of the time value counter is green. It is printed by the Central Bureau of Standards of the Ministry of Economic Affairs. The combination of the cold conditions and the low pressure is closed 6. From the front to the fan valve, please specify the roots of the pre-application basis. 2 A 4 (210X 297 gong) A: B7218930 ct D7 VI. Patent application The cold pressure is lower than the second one and the first one of the first party's Qizhong open tube S lead into the injection is closed and the injection is changed but the cold can be changed and the first valve and the first injection into the first description of the agent- When the IU1M is lost, it must be installed and controlled before it is exported to the full safety narration; in the first 8 of the time, its system is filled with the injection agent but it is cold pressed. The entry of the low valve is injected. Leicao II asks for the first application and according to a change from the value before boiling to the 'transition' is often carried out before the description is stated. Ρ1 is pre-determined at a small pressure value of Ρ1. There is only a suffix that should be present. Should control the anti-narrative front water (please first «1 read the precautions on the back and then fill in the hundred) 9 Set the pre-pressure to the general-general description of the 糸 前 入 'Injection of the valve agent into the refrigerant but the injection of the refrigerant λ pressure but the cold P2 The pressure of the force is low. 1 The encirclement before the pre-paragraph is described. The application of Ρ1 is based on the basic selection and selection of JA. Tb. J-y3¾ As stated, the pre-installed valve is inserted into the injection agent I 9 § cross-cooled, pressure-included, low-pack, two-position, and tube 1 The guide water is provided for the open cold pipe open pressure guide before the connection, and the second injection of the first injection is accessible at the low inlet, 1 'cold set second before the valve and the guide and the cross reference. Select the guide tube to select the K and select the link, and pass it through the exchange. The pre-condition valve is filled into the position and includes the closure agent package and the valve when the valve is held and preserved before the statement; the road is stored and returned. Ring Lose Xuanquan and re-announce. The first situation and the first one before the description of Kaidi Zhikai before the description of the system is controlled from 1 to the front, and the book is printed in the Green Standards Bureau of the Ministry of Economy. It is written in the note. The agent is cold. The second injection of low-pressure agent was cold and the first was low. The pre-coupling of the connection item is 1%, the first slot is formed, the storage is equipped with a storage tube, and the special guide is to condense the water. The application is based on the previous report and the front valve 3 A 4 (210X297). Printed AT B7218930 CT _D7_ 6. Patent application ® 11. A method of injecting low-pressure cooling water into a boiling water reactor of a nuclear power generation facility. This facility has an emergency core cooling water source, and the first and second independent recycling Under normal circumstances, the water is circulated through the core M of the reactor under normal circumstances to generate steam, and a safety system can generate a safe output in response to the loss of cooling water to achieve at least a predetermined amount of water coolant for the aforementioned reaction The method includes the following steps: providing first and second water flow paths from the water coolant source to the respective first and second recirculation circuits; providing a low-pressure coolant injection pump to enable start-up , M pumps water from the water source through the first and second water flow paths; provides a valve device so that it can be activated from the closed state to the open state, M achieves the first and second water flow The flow of water in the road; the valve device is activated in response to the safety output, M allows the water coolant to flow simultaneously in each of the first and second water flow paths; the injection of the low-pressure coolant is activated in response to the safety output A pump; using R 'to limit the flow of the water coolant in each of the first and second water flow paths to a predetermined flow rate, which is selected to deliver the predetermined amount of water coolant to each of the foregoing For each of the first and second independent recirculation loops, the flow rate is selected, and M effectively completes the emergency cooling of the reactor from a water flow path. 12. The method according to item 11 of the patent application scope, wherein the step of restricting the water flow of the water coolant in each of the first and second water flow paths is accomplished by applying a selected water resistance to the water flow. 1 3. The method according to item 11 of the scope of patent application, which restricts each of the aforementioned items (saying the precautions on the back of the book first and then writing a hundred copies) A 4 (210Χ 297 public) AT BT218930 S: Central Standard of the Ministry of Economic Affairs The bureau seals six. The steps of applying the water flow of the aforementioned water coolant in the first and second water flow paths of the patent a patent court by providing a selective shaped flow restriction in each of the aforementioned first and second water flow paths Kong Laishun. 14. The method according to item 11 of the patent application scope, in which the step of restricting the water flow of the water coolant in each of the first and second water flow paths is performed simultaneously for each of the aforementioned paths. 15. The method according to item 11 of the patent application scope, wherein the step of providing a low-pressure injection cooling pump includes the steps under K: providing a first low-pressure coolant injection pump in the first safety zone For pumping water from the water source through the first water flow path; providing a second low-pressure coolant injection pump in the second safety zone with a second output for pumping water from the water source through the second water flow path; K And the first and second outputs of the first and second low-pressure coolant injection pumps that are separately coupled. 16. The method according to item 15 of the patent application scope, wherein: providing a cross connection between the first and second outputs of the respective first and second low-pressure coolant injection pumps; and responding to the foregoing The safety output opens the aforementioned cross-connect valve. 17 The method according to item 11 of the patent application scope, where λ: the aforementioned first and second recirculation circuits include separate first and second recirculation pumps, with an input side, from a position below the aforementioned core The reactor is in fluid transfer communication and has a discharge side, and is in fluid transfer communication with the reactor at a position above the reactor core, and each of the first and second recirculation circuits further includes a discharge valve, Located on the aforementioned discharge side of each of the aforementioned first and second recirculation pumps; Μ and (please read the precautions on the back and then fill in the night book) k. • Order · _Line · f 4 (210X297 Gongpu) Economy Fang Central Standards Bureau printed 218930 Βτ C7 __D7_ VI. Shenchai Patent Fan ® Due to the aforementioned safety output including the step of closing each of the aforementioned exhaust valves 18-a variety of low-pressure cooling used in nuclear power generation facilities Agent injection system. The aforementioned facility has a boiling water reactor with a reactor core and normal operating pressure. The first and second recirculation circuits include separate first and second recirculation pumps and can be operated. Discharge valve, a water source for pressure suppression tank, a condensation storage tank, and a safety system that can produce a safe output in response to coolant loss accidents. This low-pressure coolant injection system contains: first and second low-pressure coolant injection pumps Burgundy has suction input and discharge output, and can be actuated to pour water; water supply pipe device, throwing K coupled to the first and second low-pressure coolant injection pump, the suction input and the pressure suppression pool for fluid communication , And includes a cross-connecting conduit device for selectively interconnecting the discharge output of the first and second low-pressure coolant injection pumps; the first and second coolant injection conduit devices are injected with the first and second low-pressure coolant injections The respective discharge outputs of the pump are coupled and lead to the respective first and second recirculation circuits; the first and second low pressure conduits located in the respective first and second low pressure coolant injection conduits The injection valve is activated between the opening and closing directions; the first and second water resistance devices located in the respective first and second coolant injection conduits, use M to restrict the flow of coolant water in A predetermined flow rate, which is selected to deliver a predetermined amount of water coolant to each of the aforementioned first and second recirculation circuits, the aforementioned flow rate is selected to be effective The catheter completes the emergency cooling of the core of the aforementioned reactor (please read the precautions on the back before writing down the hundred). Order '• Line · A 4 (210X297 Koji) 218930 A: B: C: D: Six' patent application model ® Low pressure control system, open the middle and open the low opening control valve described its shape before the second cooling and the first entry, the agent-mobilization of the second K and injection in the unified but consistent results; The agent stopped cold. It is possible to select the first time and the first time to enter the pressure access option, the first remark is cold out, the injection is low, the injection is second, the second is the front pressure, the second is the agent, and the second is the above-mentioned circulation, but the first is the valve. I have chosen one of the two Kth pressures, one storage pressure, one storage pressure, one crossover, one low, one low, and one low, and one low, and the first one, and the other is the first one. The first item is the above item, and the first set is M. The first set is 18% before the first set. The first end and the second resistance tube are installed. The description is that the valve is surrounded by the front pump and the front is installed. two. Even the pump should be put into the delivery pipe to attract profits, and the delivery condition should be noted. Special guide, drawing and description of the introduction of the agent before the water, please ask for a description; before the mixture is cited, but the status of the application before the application of the first mouth is closed but the tube is placed in the cold storage. Position and cold guide pressure and the root limit of the pump before the failure (please read the back of the first) ± the matter and fill the dome 100) Printed armor 4 (210X297 Gongguang) by the Central Bureau of Economic Development of the Ministry of Economic Affairs