CN205207212U - Flow protection controlling means is revealed to reactor coolant pump bearing seal - Google Patents
Flow protection controlling means is revealed to reactor coolant pump bearing seal Download PDFInfo
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- CN205207212U CN205207212U CN201520990446.3U CN201520990446U CN205207212U CN 205207212 U CN205207212 U CN 205207212U CN 201520990446 U CN201520990446 U CN 201520990446U CN 205207212 U CN205207212 U CN 205207212U
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Abstract
The utility model provides a flow protection controlling means is revealed to reactor coolant pump bearing seal, allow output module and main pump behaviour movable mould piece including three logic control return circuit, the logical decision module that has three -input and an output, the AND gate that has stream input and an output, signal, three logic control return circuit all includes flow transmitter, signal processing module, value judge module and the time delay module of connecting according to the preface, the three -input end of logical decision module links to each other with the time delay module that corresponds respectively, and the output links to each other with an input of AND gate, another input and the signal of AND gate allow output module to link to each other, and the output links to each other with the one end of main pump behaviour movable mould piece, the other end of main pump behaviour movable mould piece links to each other with the main pump gate. Implement the utility model discloses, can overcome protection controlling means's protection logical design's among the prior art weak link, avoid protecting the main pump mistake to move and refuse, reach the risk reduction, reduce the level of safety's of economic loss and the operation of reinforcing nuclear power purpose.
Description
Technical field
The utility model relates to compressed water reactor nuclear power technical field, particularly relates to a kind of reactor coolant pump shaft seal and reveals flow protecting control device.
Background technique
Reactor coolant pump (hereinafter referred to as main pump) is called as " heart " of reactor, and current main pump of pressurized water reactor nuclear power plants adopts shaft seal pump substantially, and three grades of shaft seals of tandem arrangement control reactor coolant and reveal along main pump shaft.Seal water by cvcs to main pump No. 1 shaft seal supply, to prevent reactor coolant from flowing vertically, cool shaft seal and pump bearing simultaneously.
In prior art, reactor coolant pump shaft seal is revealed flow protecting control device and is sealed envelope loss of-coolant accident (LOCA) for preventing main pump shaft, reveals flow detect main pump No. 1 shaft seal, if reveal flow to reach 1.2m
3/ h, will send alarm signal; If reveal flow to reach 1.4m
3/ h and continuing for some time, jumps main pump signal (2/3 pressure channel voltage stabilizer pressure measuring value is higher than definite value) by generation, and the heap that induces reaction jumps heap.The relay protective scheme that above-mentioned protecting control device realizes as shown in Figure 1, concrete logic implementation is: detected by flow transmitter 101 pairs of main pump shaft seal leakage flow amounts and formed checkout value, export as the signal that can transmit in circuit after this checkout value is admitted to and carries out pretreatment in signal processing module 201, after this signal is admitted to and contrasts with the flow value preset in value judge module 202, export in comparing result to time delay module 203 to send into according to the pressure signal judgment value that voltage stabilizer pressure condition in reactor produces with signal permission output module 106 after time delay certain hour simultaneously and calculate with door block 204, realize tripping to main pump or closing the control of lock by sending into main pump actuating module 108 with the calculated value of door block 204.
Because the relay protective scheme design of above-mentioned protecting control device exists weak link; the components and parts fault (as time delay module 203, value decision block 202 etc. break down) existed for computing in drifting fault and control gear as flow transmitter 101 causes relay protective scheme misoperation; therefore easily cause protection main pump mistake action and rejecting action, bring tremendous economic to lose and potential safety hazard to nuclear power station.
Model utility content
The utility model embodiment technical problem to be solved is; a kind of reactor coolant pump shaft seal is provided to reveal flow protecting control device; the weak link of the relay protective scheme design of protecting control device in prior art can be overcome; thus avoid protection main pump mistake action and rejecting action; reach reduction risk, reduce the object of the level of security of economic loss and the operation of enhancing nuclear power.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of reactor coolant pump shaft seal and reveals flow protecting control device, and for controlling main pump tripping operation or closing lock, described protecting control device comprises:
Three loop control logics, each loop control logic include sequentially connect for detect described main pump shaft seal vent flow and formed checkout value flow transmitter, for converting signal processing module that signal exports after described checkout value is carried out pretreatment to, to be used for the output logic value when the value extracting described converted output signal is greater than default limit current value be the value judge module of 1 and the time delay module that described logic value exported after default delay time;
One logic judgment module, described logic judgment module has three input ends and an output terminal, and its three input ends are connected with the time delay module of a corresponding loop control logic respectively; Wherein, if when the logic value after having at least two to get described time delay among three input ends of described logic judgment module is 1, then the value that described logic judgment module exports is 1; No, then the value that described logic judgment module exports is 0;
One and door, described have two input ends and an output terminal with door, and one input end is connected with the output terminal of described logic judgment module;
One signal allows output module, and described signal allows output module to be connected with another input end of door with described; Wherein, described signal allows output module when getting that in reactor, voltage stabilizer pressure is greater than predetermined value, and its value exported is 1;
One main pump actuating module, one end of described main pump actuating module is connected with the output terminal of door with described, and the other end is connected with the gate of described main pump; Wherein, when described main pump actuating module is 1 with door output value described in getting, control the tripping operation of described main pump.
Wherein, when described main pump actuating module is 0 with door output value described in getting, controls described main pump and close lock.
Wherein, described default limit current value is 1.4m
3/ h.
Wherein, described default delay time is 25 seconds.
Implement the utility model embodiment, there is following beneficial effect:
In the utility model embodiment; because protecting control device adopts three loop control logics; three can be carried out to the leakage flow measurement of reactor coolant pump shaft seal and signal transacting and get two logical process; there is the defect of single failure in the relay protective scheme overcoming protecting control device in prior art; realize at flow transmitter and under components and parts (as time delay module, value decision block) arbitrary fault of computing; all can prevent protection main pump mistake action and rejecting action; thus reach reduction risk, reduce the object of the level of security of economic loss and the operation of enhancing nuclear power.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, the accompanying drawing obtaining other according to these accompanying drawings still belongs to category of the present utility model.
Fig. 1 is the structural representation that in prior art, reactor coolant pump shaft seal reveals the logic design of flow protecting control device;
The structural representation of the logic design of the reactor coolant pump shaft seal leakage flow protecting control device that Fig. 2 provides for the utility model embodiment;
In figure, 1-loop control logic, 11-flow transmitter, 12-signal processing module, 13-value judge module, 14-time delay module, 2-logic judgment module, 3-and door, 4-signal allows output module, 5-main pump actuating module.
Embodiment
For making the purpose of this utility model, technological scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 2, for a kind of reactor coolant pump shaft seal provided in the utility model embodiment reveals flow protecting control device, trip for controlling main pump control switch (not shown) or close lock, this protecting control device comprises:
Three loop control logics 1, each loop control logic 1 include sequentially connect for detect main pump shaft seal vent flow and formed checkout value flow transmitter 11, for converting signal processing module 12 that signal exports after checkout value is carried out pretreatment to, to be used for the output logic value when the value extracting above-mentioned converted output signal is greater than default limit current value be the value judge module 13 of 1 and the time delay module 14 that logic value exported after default delay time;
One logic judgment module 2, logic judgment module 2 has three input ends and an output terminal, and its three input ends are connected with the time delay module 14 of a corresponding loop control logic respectively; Wherein, if when the logic value after having at least two to get time delay among three input ends of logic judgment module 2 is 1, then the value that logic judgment module 2 exports is 1; No, then the value that logic judgment module 2 exports is 0;
One with door 3, have two input ends and an output terminal with door 3, one input end is connected with the output terminal of logic judgment module 2;
One signal allows output module 4, and signal allows output module 4 to be connected with another input end of door 3; Wherein, signal allows output module 4 when getting that in reactor, voltage stabilizer pressure is greater than predetermined value, and its value exported is 1;
One main pump actuating module 5, one end of main pump actuating module 5 is connected with the output terminal of door 3, and the other end is connected with main pump control switch; Wherein, main pump actuating module 5, when to get with door 3 output value be 1, controls the tripping operation of main pump control switch; Certainly, main pump actuating module 5, when to get with door 3 output value be 0, control main pump control switch and closes lock.
It should be noted that when in reactor, voltage stabilizer pressure is greater than predetermined value, main pump shaft seal leakage flow amount can be greater than default limit current value, as 1.4m
3/ h, this limit current value can be arranged according to concrete actual conditions.In one embodiment, default delay time is 25 seconds, can guarantee that the logic value of loop control logic 1 allows the output value of output module 4 to arrive with signal simultaneously calculates with door 3 after logic judgment module 2 calculates.
Be understandable that; revealing flow when reactor coolant pump shaft seal exceeds now; even if can guarantee to exist in a loop control logic single failure (as flow transmitter 11 drifts about fault; components and parts fault such as value judge module 13 and/or time delay module 14 etc.) time, also can realize preventing main pump false protection or misaction.
Reactor coolant pump shaft seal in the utility model embodiment reveals flow protecting control device working principle: detect main pump shaft seal vent flow by the flow transmitter 11 of three loop control logics 1 simultaneously and form three checkout values, and detect three checkout values are sent into corresponding signal processing module 12 respectively successively according to the loop control logic of correspondence, value judge module 13 and time delay module 14 process, draw the logic value of each loop control logic, afterwards the logic value of each loop control logic obtained is sent in logic judgment module 2 and calculate.
Have at least the logic value of two loop control logics 1 to be 1 once existence, the value that logic judgment module 2 exports is 1, otherwise is 0; And value logic judgment module 2 exported sends into the input end with door 2, allowed by signal the output value of output module 4 to send into another input end with door 2 simultaneously, thus calculate the value will sending into main pump actuating module 5, the value that basis and door 2 calculate is controlled main pump control switch and trips or close lock by main pump actuating module 5, if main pump actuating module 5 is when to get with door 3 output value be 1, control the tripping operation of main pump control switch; Main pump actuating module 5, when to get with door 3 output value be 0, control main pump control switch and closes lock, thus reduce main pump false tripping risk, improve unit availability, enhance the level of security that nuclear power runs.
Implement the utility model embodiment, there is following beneficial effect:
In the utility model embodiment; because protecting control device adopts three loop control logics; three can be carried out to the leakage flow measurement of reactor coolant pump shaft seal and signal transacting and get two logical process; there is the defect of single failure in the relay protective scheme overcoming protecting control device in prior art; realize at flow transmitter and under components and parts (as time delay module, value decision block) arbitrary fault of computing; all can prevent protection main pump mistake action and rejecting action; thus reach reduction risk, reduce the object of the level of security of economic loss and the operation of enhancing nuclear power.
Above disclosedly be only a kind of preferred embodiment of the utility model, certainly can not limit the interest field of the utility model with this, therefore according to the equivalent variations that the utility model claim is done, still belong to the scope that the utility model is contained.
Claims (4)
1. reactor coolant pump shaft seal reveals a flow protecting control device, and for controlling the tripping operation of main pump control switch or closing lock, it is characterized in that, described protecting control device comprises:
Three loop control logics (1), each loop control logic (1) include sequentially connect for detect described main pump shaft seal vent flow and formed checkout value flow transmitter (11), for converting signal processing module (12) that signal exports after described checkout value is carried out pretreatment to, for being greater than default limit current value when the value extracting described converted output signal time output logic value be the value judge module (13) of 1 and time delay module (14) that described logic value is exported after default delay time;
One logic judgment module (2), described logic judgment module (2) has three input ends and an output terminal, and its three input ends are connected with the time delay module (14) of a corresponding loop control logic respectively; Wherein, if when the logic value after having at least two to get described time delay among three input ends of described logic judgment module (2) is 1, then the value that described logic judgment module (2) exports is 1; No, then the value that described logic judgment module (2) exports is 0;
One with door (3), described have two input ends and an output terminal with door (3), and one input end is connected with the output terminal of described logic judgment module (2);
One signal allows output module (4), and described signal allows output module (4) to be connected with described another input end with door (3); Wherein, described signal allows output module (4) when getting that in reactor, voltage stabilizer pressure is greater than predetermined value, and its value exported is 1;
One main pump actuating module (5), one end of described main pump actuating module (5) is connected with the described output terminal with door (3), and the other end is connected with described main pump control switch; Wherein, when described main pump actuating module (5) is 1 with door (3) output value described in getting, control the tripping operation of described main pump control switch.
2. protecting control device as claimed in claim 1, is characterized in that, when described main pump actuating module (5) is 0 with door (3) output value described in getting, controls described main pump control switch and closes lock.
3. protecting control device as claimed in claim 1, it is characterized in that, described default limit current value is 1.4m
3/ h.
4. protecting control device as claimed in claim 1, it is characterized in that, described default delay time is 25 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520990446.3U CN205207212U (en) | 2015-12-03 | 2015-12-03 | Flow protection controlling means is revealed to reactor coolant pump bearing seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520990446.3U CN205207212U (en) | 2015-12-03 | 2015-12-03 | Flow protection controlling means is revealed to reactor coolant pump bearing seal |
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|---|---|
| CN205207212U true CN205207212U (en) | 2016-05-04 |
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|---|---|---|---|
| CN201520990446.3U Active CN205207212U (en) | 2015-12-03 | 2015-12-03 | Flow protection controlling means is revealed to reactor coolant pump bearing seal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242271A (en) * | 2016-12-27 | 2018-07-03 | 中广核研究院有限公司 | A kind of reactor virtual protection control device and its corresponding protection system |
| CN110296099A (en) * | 2018-03-23 | 2019-10-01 | 格兰富控股联合股份公司 | Pump assembly and method for monitoring the liquid portion in the sealing structure in pump assembly |
-
2015
- 2015-12-03 CN CN201520990446.3U patent/CN205207212U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242271A (en) * | 2016-12-27 | 2018-07-03 | 中广核研究院有限公司 | A kind of reactor virtual protection control device and its corresponding protection system |
| CN110296099A (en) * | 2018-03-23 | 2019-10-01 | 格兰富控股联合股份公司 | Pump assembly and method for monitoring the liquid portion in the sealing structure in pump assembly |
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