CN1174434C - Nuclear reactor cooling equipment and its operation method - Google Patents

Abstract

The invention discloses a nuclear reactor cooling equipment and its operation method. To reduce radiation exposure dose of workers during acces to a reactor pressure vessel in reactor well and remove decay heat without disturbing replacing work of fuel assemblies and control rods. In a reactor well and a fuel pool constructed in a reactor building, the outlet side of the fuel pool return line of a fuel pool cooling and purifying system line placed downstream the skimer surge line neighboring to the fuel pool is placed in the reactor well and the outlet side of reactor residual heat removal system lines are placed in the fuel pool. By this, radioactive crad contained in reactor water in the reactor pressure vessel is prevented from accumulating on the bottom of the reactor well and so radioactive exposure dose of workers can be reduced.

Description

Nuclear reactor cooling equipment and method of operation thereof

Technical field

The present invention relates to does not a kind ofly influence operation near reactor pressure vessel the time in nuclear power station, can reduce the radioactive ray irradiation dose of reactor well, eliminates thermal-radiating reactor cooling device of decay and method of operation thereof.

Background technology

With reference to Figure 16, the reactor cooling device of modified boiling nuclear power station is described.

Figure 16 represents the piping system overview of reactor cooling device in the past.In Figure 16, symbol 1 is a reactor pressure vessel, and lid of reactor is pulled down in expression, removes the state of shielding head (shroud head), steam-water separator and steam heated oven on the reactor core 2.The overview of symbol 3 expression internal pumps (internal pump), the thick line among Figure 16 are represented the mobile states of water such as chilled water, heap water, pond (pool) water; Fine rule is represented not flow state of water.

In Figure 16, reactor pressure vessel 1, the lateral surface of upper end open portion is installed in the bottom of the reactor well of constructing in the reactor building (not having diagram) 4 by connecting elements (do not have diagram) with the water-stop state, and the bottom of reactor pressure vessel 1 is by bearing (not having diagram) supporting.Adjacent and constructed fuel tank 5 with reactor well 4, reactor well 4 and fuel tank 5 are separated by pond lock 6.

Adjacent with fuel tank 5 and reactor well 4 and be provided with a plurality of equalizing tanks (skimmer surge tank) 7 that separate.Separate equalizing tank 7 and be that the water clarification liquid of overflows flows in fuel tank 5 and the reactor well 4 in order to allow, its underpart is connected on fuel tank cooling and purifying system (the being designated hereinafter simply as FPC) pipeline 8.

Be connected in series successively on FPC pipeline 8 inlet shut-off valve 9, FPC pump 10, FPC filters desalting plant 11, port closing valve 12 and FPC heat exchanger 13, filter the outlet side of the port closing valve 12 of the upstream side of desalting plant 11 and downstream side at FPC, connected FPC bypass line 15 with by-pass valve 14.

FPC pump 10, FPC filter desalting plant 11 and FPC heat exchanger 13 is provided with 2 respectively abreast.Between FPC filtration desalting plant 11 and port closing valve 12, carry out branch, connected inhibition pond (supression pool) cleaning system (being designated hereinafter simply as SPCU) pipeline 16.Downstream side at FPC heat exchanger 13 has connected fuel tank return line 17, and fuel tank return line 17 is connected to by non-return valve 18 and returns on the water injection pipeline 19.

FPC returns water and injects pipeline 19 and be arranged on the fuel tank 5, near set returning the bottom surface that water inlet 20 is positioned at fuel tank 5 on its lower end.SPCU pipeline 16 is set on reactor well 4, and is connected with SPCU pipeline 16 that FPC filters the outlet side of desalting plant 11.

Between the outlet side and reactor well 4 of the inlet non-return valve 9 of FPC pipeline 8, the entrance side that is provided with the inlet shut-off valve 9 of FPC reactor well associated line 22 with non-return valve 21, FPC pipeline 8 is connected with FPC-RHR associated line 28, this associated line 28 has non-return valve 27a ~ 27c, and making it correspond respectively to the reactor waste that is connected with reactor pressure vessel 1, to eliminate RHR (A) of system's (being designated hereinafter simply as RHR) pipeline be that pipeline 23 and RHF (B or C) are pipeline 24.

The RHR pipeline is made of the from the 1st to the 3rd 3 systems that are provided with, and for the purpose of explanation, it is divided into RHR (A) is that pipeline 23 and RHF (B or C) are pipeline 24.At RHF (A) is that pipeline 23 and RHR (B or C) have been connected in series RHR pump 25, RHR heat exchanger 26 respectively successively on the pipeline 24, and its downstream side is connected with fuel tank return line 17 by RHR-FPC link line (tieline) 29.Carry out branch from RHR-FPC link line 29, be provided with the RHF backwater and inject line 31, its RHR backwater inlet 30 reaches near the bottom surface in the reactor well 4.

In Figure 16, symbol 32,33,34a, 34b represent shut-off valve respectively, 35 expression reactor feedwater systems (FDW).Reactor feedwater system 35 has the first feedwater distribution pipeline (sparger line or claim sprayer pipeline) the 46 and the 2nd feedwater distribution pipeline 47, and these feedwater distribution pipelines 46,47 are connected respectively on 2 feedwater sprayers 37,37 in the reactor pressure vessel 1.

RHR (A) is that pipeline 23 is connected with the 1st feedwater distribution pipeline 46 with shut-off valve 39 by the take-off pipe 38 that branch connects.And RHR (B or C) is that pipeline 24 is that (hereinafter to be referred as LPFL) distribution pipeline 45 is connected with low pressure water injection, and LPFL distribution pipeline 45 is connected with reactor pressure vessel 1 interior set a plurality of LPFL sprayers 36.

Wherein, 1 system of RHR pipeline (RHR (A) is) 23 is connected on the feedwater sprayer 37 of reactor feedwater system 35, turn back to reactor pressure vessel 1 from this feedwater sprayer 37, other 2 systems (RHR (B or C) is) 24 turn back to reactor pressure vessel 1 from LPFL sprayer 36.37 pairs of 1 systems of feedwater sprayer are provided with 3, and 2 systems are provided with 6 altogether, and 36 pairs of systems of LPFL sprayer are provided with one, are provided with 2 altogether.

In Figure 16, symbol 40 is operate ground height, the 41st, and chilled water, the 42nd, the liquid level of chilled water 41, the 43rd, shut-off valve, it is arranged on the RHR backwater and injects on the pipeline 31, and 44 is shut-off valve equally, and it is arranged on the LPFL pipeline 45 that is used to connect LPFL sprayer 36.

In the nuclear power station that is provided with the boiling water type reactor, the fuel assembly of in to reactor core 2, being adorned, in reactor pressure vessel 1, carry out under the situation of access when control rod is changed operation, basically carry out operation from operate ground height 40, so, utilize long device to carry out operation.Therefore, must get rid of the influence that chilled waters 41 in reactor well 4 and the fuel tank 5 flow etc. and to be produced as far as possible.

In the case, in original modified boiling water type reactor, must get rid of the fuel decay heat radiation in the fuel assemblies that exist in reactor pressure vessel 1 or the fuel tank 5 on one side, get rid of the flowing of the chilled water 41 that near reactor pressure vessel 1 time hinder operation on one side.

For this reason, utilize the FPC filtration desalting plant 11 of FPC pipeline 8 to come the chilled water that comes out in fuel tank water and the reactor well is purified, make process FPC heat exchanger 13 carry out cooled chilled water by FPC backwater injection pipeline 19 and turn back in the fuel tank 5 from fuel tank return line 17.And RHR (A) is that pipeline 23, RHR (B or C) are that the running of 2 systems of pipeline 24 and chilled water after being cooled inject pipeline 31 from the RHR backwater and turn back in the reactor well 4 in the system equipment of RHR pipeline 3.

Yet, in the heap water that from reactor pressure vessel 1, flows out, contain and be with radioactive dirt, accumulation of mud is in the bottom of reactor well 4, when reactor well 4 is carried out draining reactor well 4 bottoms are removed when polluting operation, radioactive ray may increase operating personnel's radiation dose.

Summary of the invention

The present invention proposes in order to address the above problem just, its purpose is to provide a kind of like this reactor cooling device and method of operation thereof, for example, under the situation of coming by operated from a distance near (or be called enter) reactor pressure vessel, do not hinder operation, can reduce the radiation dosage of reactor well, eliminate the decay heat radiation effectively.

For achieving the above object, the present invention takes following technical scheme:

A kind of reactor cooling device is characterized in that having: the reactor well and the fuel tank of constructing by the pond gate; At least one of this reactor well and fuel tank has the fuel tank cooling and purifying systematic pipeline that filters desalting plant as the water source; Be built up in the reactor pressure vessel of above-mentioned reactor well bottom; And be connected with this reactor pressure vessel, have the reactor waste removal system pipeline of a plurality of systems of heat exchanger,

The backwater inlet of the fuel tank return line that the downstream side with above-mentioned fuel tank cooling and purifying systematic pipeline is connected is arranged in the above-mentioned reactor well, and the backwater inlet of the downstream side return line of above-mentioned reactor waste removal system pipeline is arranged in the above-mentioned fuel tank.

A kind of reactor cooling device is characterized in that having: the reactor well and the fuel tank of constructing by the pond gate; At least one of this reactor well and fuel tank has the fuel tank cooling and purifying systematic pipeline that filters desalting plant as the water source; Be built up in the reactor pressure vessel of above-mentioned reactor well bottom; And be connected with this reactor pressure vessel, have the reactor waste removal system pipeline of a plurality of systems of heat exchanger,

The backwater inlet of the fuel tank return line that the downstream side with above-mentioned fuel tank cooling and purifying systematic pipeline is connected is arranged in the above-mentioned reactor well, the backwater inlet of the downstream side return line of above-mentioned reactor waste removal system pipeline is arranged in the above-mentioned fuel tank, and be provided with a kind of blocked operation pipeline, this pipeline can make the chilled water of above-mentioned fuel tank cooling and purifying systematic pipeline turn back to above-mentioned fuel tank or above-mentioned reactor well, and the chilled water of above-mentioned reactor waste removal system pipeline is turned back in above-mentioned reactor well or the above-mentioned fuel tank.

Described reactor cooling device, it is characterized in that: in the reactor waste removal system pipeline of above-mentioned a plurality of systems, have at least a system to be connected on the feedwater sprayer set in the above-mentioned reactor pressure vessel, and branch is connected on the low pressure water injection system sprayer set in the above-mentioned reactor pressure vessel.

Described reactor cooling device, it is characterized in that: by non-return valve and shut-off valve, fuel tank cooling and purifying system backwater is injected pipeline be connected on the above-mentioned fuel tank return line, the outlet side pipeline of cooled chilled water in the heat exchanger set in above-mentioned reactor waste removal system is connected on above-mentioned fuel tank cooling and purifying system's backwater injection pipeline and the reactor feedwater systematic pipeline.

Described reactor cooling device is characterized in that:

Filtrator or filtration desalting plant, be arranged in the coolant outlet side pipe road system of above-mentioned reactor waste removal system pipeline.

Described reactor cooling device, it is characterized in that: at least one reactor well sprayer that is connected with the above-mentioned return line of above-mentioned reactor waste removal system pipeline, be set in the above-mentioned reactor well, the cooling water outlet of above-mentioned reactor well sprayer, be separately positioned on towards the oblique direction down of above-mentioned reactor pressure vessel center line with on the horizontal direction of above-mentioned center line.

Described reactor cooling device is characterized in that being provided with a kind of device, and this device is set at the water (flow) direction that sprays the low pressure water injection system sprayer in being arranged on above-mentioned reactor pressure vessel downwards.

Described reactor cooling device is characterized in that: in above-mentioned fuel tank the fan diffuser with a plurality of chilled water squit holes is arranged to a plurality of column plate shapes.

Described reactor cooling device is characterized in that: the 1st water-supply line and the 2nd water-supply line, be connected on the feedwater sprayer that is arranged on 2 systems in the above-mentioned reactor pressure vessel; These water-supply lines respectively by the 1st non-return valve and the 2nd non-return valve, are connected on the reactor coolant cleaning system pipeline; This reactor coolant cleaning system pipeline, between above-mentioned the 1st water-supply line and the 1st non-return valve, be connected on the above-mentioned reactor waste removal system pipeline, and, above-mentioned the 1st non-return valve as the non-return valve that has the positive opening function.

Described reactor cooling device, it is characterized in that: setting connects from above-mentioned reactor waste removal system line branches, reactor coolant cleaning system pipeline with regenerative heat exchanger and filtration desalting plant, the reactor coolant cleaning system return line that is connected with the outlet side of the filtration desalting plant of this reactor coolant cleaning system pipeline, be connected to above-mentioned reactor feedwater systematic pipeline that above-mentioned feedwater sprayer is connected on, on above-mentioned reactor coolant cleaning system return line, the reactor coolant cleaning system bypass line that above-mentioned heat exchanger is carried out bypass is set.

Described reactor cooling device, it is characterized in that: on the filtration desalting plant of above-mentioned fuel tank cooling and purifying systematic pipeline, be provided with bypass line with by-pass valve, open by above-mentioned by-pass valve, can increase the flow in the heat exchanger that enters into above-mentioned fuel tank cooling and purifying systematic pipeline this bypass line.

Described reactor cooling device, it is characterized in that: the reactor waste removal system of above-mentioned a plurality of systems is made of 3 systems of the 1st to the 3rd, the 1st system makes through this system heat exchanger and carries out cooled chilled water, turns back in above-mentioned reactor feedwater systematic pipeline or the above-mentioned fuel tank; The 2nd system makes the heat exchanger through this system carry out cooled chilled water, turns back in the above-mentioned fuel tank; The 3rd system makes the heat exchanger through this system carry out cooled chilled water, turn back in the above-mentioned fuel tank, and, above-mentioned fuel tank cooling and purifying systematic pipeline extracts above-mentioned fuel tank water, makes it by suppress the pond cleaning system and turn back to above-mentioned reactor well or machine is installed in the pond temporarily after purifying.

Described reactor cooling device is characterized in that: above-mentioned reactor waste removal system is made of 3 systems of the 1st to the 3rd, and the heat exchanger that is provided with respectively from 3 systems of above-mentioned the 1st system to the has at least 2 to be connected in series and to turn round.

The present invention, it is characterized in that having: the reactor well and the fuel tank of constructing by the pond gate, at least one of this reactor well and fuel tank is as the water source, and has a fuel tank cooling and purifying systematic pipeline that filters desalting plant, be built up in the reactor pressure vessel of above-mentioned reactor well bottom, and be connected with this reactor pressure vessel, reactor waste removal system pipeline with a plurality of systems of heat exchanger, the backwater inlet of the fuel tank return line that the downstream side with above-mentioned fuel tank cooling and purifying systematic pipeline is connected is arranged in the above-mentioned reactor well; The backwater inlet of the downstream side return line of above-mentioned reactor waste removal system pipeline is arranged in the above-mentioned fuel tank.

If by the present invention, the chilled water that has been cleaned, has cooled off by the FPC system is turned back in the reactor well, the chilled water that has been cooled by the RHR system is turned back in the fuel tank.Like this, can not hinder operation, can reduce the radioactive ray exposure dosage in the reactor well, can get rid of the decay heat radiation in time by remote manipulation and near reactor pressure vessel.

Described invention, it is characterized in that having: the reactor well and the fuel tank of constructing by the pond gate, at least one of this reactor well and fuel tank is as the water source, has the fuel tank cooling and purifying systematic pipeline that filters desalting plant, be built up in the reactor pressure vessel of above-mentioned reactor well bottom, and be connected with this reactor pressure vessel, reactor waste removal system pipeline with a plurality of systems of heat exchanger, the backwater inlet of the fuel tank return line that the downstream side with above-mentioned fuel tank cooling and purifying systematic pipeline is connected is arranged in the above-mentioned reactor well; The backwater inlet of the downstream side return line of above-mentioned reactor waste removal system pipeline is arranged in the above-mentioned fuel tank.Simultaneously, be provided with a kind of blocked operation pipeline, it is used to make the chilled water of above-mentioned fuel tank cooling and purifying systematic pipeline to turn back in above-mentioned fuel tank or the above-mentioned reactor well, and the chilled water of above-mentioned reactor waste removal system pipeline is turned back in above-mentioned reactor well or the above-mentioned fuel tank.

If adopt the present invention, then can be by carrying out switching manipulation chilled water is turned back in reactor well or the fuel tank to being arranged on transfer valve in the reactor waste removal system pipeline.And, the chilled water of fuel tank cooling and purifying systematic pipeline is turned back in the reactor well from other blocked operation pipelines.

Described invention, it is characterized in that: at least one system is connected on the feedwater sprayer that is arranged in the above-mentioned reactor pressure vessel in the reactor waste removal system pipeline of above-mentioned a plurality of systems, is branched simultaneously to be connected on the low pressure water injection system sprayer (ス パ one ジ ャ) that is arranged in the above-mentioned reactor pressure vessel.

If according to the present invention, reduce the interior chilled water flow velocity of reactor pressure vessel even then carry out the sort of picture, make RHR system cools water turn back to such running in the reactor pressure vessel, also can not influence operation, can bring into play simultaneously and get rid of the decay heat radiation and improve these two kinds of effects of operation.

Described invention is characterized in that: by non-return valve and shut-off valve fuel tank cooling and purifying system backwater is injected pipeline and be connected on the above-mentioned fuel tank return line; Being connected to above-mentioned fuel tank cooling and purifying system backwater and injecting on pipeline and the reactor feedwater systematic pipeline through being arranged on outlet side pipeline that heat exchanger in the above-mentioned reactor waste removal system carries out cooled chilled water.

If according to the present invention, then making process FPC system and RHR system cool off chilled water afterwards turns back in the fuel tank, making process RHR system cool off chilled water afterwards simultaneously turns back in the feedwater sprayer, like this, in nuclear power station, come by remote manipulation near in the reactor pressure vessel time, can not hinder operation, can reduce the radioactive ray exposure dosage in the reactor well, can get rid of the decay heat radiation.

Described invention, it is characterized in that: have: the reactor well and the fuel tank of constructing by the pond gate, be built up in the reactor pressure vessel of above-mentioned reactor well bottom and be connected reactor waste removal system pipeline on this reactor pressure vessel, the backwater inlet of the downstream side return line of above-mentioned reactor waste removal system pipeline is arranged in the above-mentioned reactor well, carry out branch from above-mentioned reactor waste removal system pipeline, the reactor well back with water inlet line with water inlet is connected to above-mentioned reactor well top.

If adopt the present invention, the top water of reactor well is flow in the reactor waste removal system pipeline, cool off with the heat exchanger of this pipeline, this chilled water is turned back in the reactor well.Because the top water of reactor well cleans, so can reduce the radioactive ray exposure dosage of reactor well.And, do not need to make the chilled water of reactor waste removal system pipeline to turn back in the reactor pressure vessel, can not hinder operation, can eliminate the decay heat radiation.

Described invention, it is characterized in that: have: the reactor well of constructing by the pond gate and at least one of fuel tank, this reactor well and fuel tank are as the water source, have the fuel tank cooling and purifying systematic pipeline that filters desalting plant, be built up in the reactor pressure vessel of above-mentioned reactor well bottom and be connected with this reactor pressure vessel, reactor waste removal system pipeline with a plurality of systems of heat exchanger filters desalting plant to filtrator or the 2nd and is arranged in the coolant outlet side pipe road system of this reactor waste removal system pipeline.

If adopt the present invention, then when nuclear power station comes near reactor pressure vessel in the remote-controlled operation mode, because in filtrator or filtration desalting plant the RHR system being carried out cooled chilled water purifies, it is turned back in the reactor well, so, can not hinder operation, can reduce the radioactive ray exposure dosage in the reactor well, can get rid of the decay heat radiation.

Described invention, it is characterized in that: at least one reactor well sprayer that is connected with above-mentioned return line is set in the above-mentioned reactor well, the cooling water outlet of above-mentioned reactor well sprayer is separately positioned on towards the oblique direction down of above-mentioned reactor pressure vessel center line with on the horizontal direction of above-mentioned center line.

If adopt the present invention, then,, eliminate the decay heat radiation so can reduce the radioactive ray raying dosage of chilled water because the cooling water outlet of reactor well sprayer is arranged on towards the oblique direction down of center line with on the horizontal direction of center line.

Described invention is characterized in that being provided with a kind of like this device, promptly the water (flow) direction that sprays the low pressure water injection system sprayer in being arranged on above-mentioned reactor pressure vessel is set at downwards.

If adopt the present invention; then because low pressure water injection system sprayer has been installed a kind of top and inboard protective device of covering; so; by remote manipulation and under near the situation in the reactor pressure vessel; when making the heap water that is cooled by reactor waste removal system pipeline turn back in the low pressure water injection systematic pipeline sprayer; can prevent that backwater is fed directly to the central authorities in the reactor pressure vessel; so; can not hinder operation; the radioactive ray exposure dosage in the reactor well can be reduced, the decay heat radiation can be got rid of.

Perhaps; the downward a plurality of roses of a kind of chilled water ejiction opening are installed below low pressure water injection system sprayer; like this; chilled water just sprays between reactor pressure vessel and protective cover; the center position to reactor pressure vessel does not spray; can limit dirt and be brought in the reactor well, can reduce the radioactive ray raying dosage in the reactor well.And, when coming near reactor pressure vessel, can not hinder operation with the remote-controlled operation method, can eliminate the decay heat radiation.

Described invention is characterized in that in above-mentioned fuel tank the fan diffuser with a plurality of chilled water squit holes being arranged to a plurality of (multilayer) column plate shape.If adopt this invention, then,, a large amount of chilled waters is turned back in the fuel tank so need not enlarge pipe diameter owing in fuel tank, fan diffuser is arranged to be divided into a plurality of column plate shapes up and down.Therefore, can carry out the interior design arrangement of fuel tank effectively.

Described invention is characterized in that: the 1st water-supply line and the 2nd water-supply line are connected on the feedwater sprayer that is arranged on 2 systems in the above-mentioned reactor pressure vessel; These water-supply lines are connected on the reactor coolant cleaning system pipeline by the 1st non-return valve and the 2nd non-return valve respectively; This reactor coolant cleaning system pipeline is being connected between above-mentioned the 1st water-supply line and the 1st non-return valve on the above-mentioned reactor waste removal system pipeline.And, above-mentioned the 1st non-return valve as the non-return valve that has the positive opening function.

If adopt the present invention, then can utilize band to make chilled water to flowing in the other direction with the non-return valve of positive opening function.So can make the chilled water that comes from reactor waste removal system pipeline through being installed in reactor coolant cleaning system pipeline on motorized valve or water supply system shut-off valve, turn back to the 1st feedwater sprayer pipeline or the 2nd feedwater sprayer pipeline of reactor feedwater system selectively.Can be controlled at influence Min., can eliminate the decay heat radiation the operation in the reactor pressure vessels such as refuel.

Described invention, it is characterized in that: have: the reactor well and the fuel tank of constructing by the pond gate, at least one of this reactor well and fuel tank is as the water source, has the fuel tank cooling and purifying systematic pipeline that filters desalting plant, be built up in the reactor pressure vessel of above-mentioned reactor well bottom, and be connected with this reactor pressure vessel, reactor waste removal system pipeline with a plurality of systems of heat exchanger, be provided with a kind of from above-mentioned reactor waste removal system line branches connection, a kind of reactor coolant cleaning system pipeline that has regenerative heat exchanger and filter desalting plant is set, the reactor coolant cleaning system return line that is connected with the outlet side of the filtration desalting plant of this reactor coolant cleaning system pipeline is connected on the above-mentioned reactor feedwater systematic pipeline, a kind of reactor coolant cleaning system bypass line that above-mentioned heat exchanger is carried out bypass is set on above-mentioned reactor coolant cleaning system return line.

If adopt the present invention, then, make reactor coolant purifying regeneration heat exchanger carry out the bypass running, so can improve the thermal-radiating elimination efficient of decay owing to be provided with reactor coolant cleaning system bypass line.

Described invention is a kind of method of operation of reactor cooling device, this reactor cooling device has: the reactor well and the fuel tank of constructing by the pond gate, at least one of this reactor well and fuel tank has the fuel tank cooling and purifying systematic pipeline that filters desalting plant and heat exchanger as the water source, be built up in the reactor pressure vessel of above-mentioned reactor well bottom, and be connected with this reactor pressure vessel by shut-off valve, the reactor waste removal system pipeline that connects heat exchanger successively, the method of operation of this reactor cooling device is characterised in that: be provided with the bypass line with by-pass valve on the filtration desalting plant of above-mentioned fuel tank cooling and purifying systematic pipeline, the above-mentioned by-pass valve of this bypass line is opened, can be increased the flow in the heat exchanger that enters into above-mentioned fuel tank cooling and purifying systematic pipeline.

If adopt the present invention, then open by the by-pass valve that the fuel tank cleaning system is filtered desalting plant, the flow of fuel tank cleaning system can be increased,, the thermal efficiency that removes of fuel tank cleaning system can be improved by increasing the flow of fuel tank clean-up system heat exchanger.

Described invention is a kind of method of operation of reactor cooling device, this reactor cooling device has: the reactor well and the fuel tank of constructing by Chi Zha, has the fuel tank cooling and purifying systematic pipeline that filters desalting plant as the water source with at least one of this reactor well and fuel tank, be built up in the reactor pressure vessel of above-mentioned reactor well bottom, the reactor waste removal system pipeline of a plurality of systems of being connected with this reactor pressure vessel with heat exchanger, and the reactor waste removal system one fuel tank cooling and purifying system that is used for above-mentioned reactor waste removal system pipeline is connected with fuel tank cleaning system pipeline communication pipeline, the method of operation of this reactor cooling device is characterised in that: the reactor waste removal system of above-mentioned a plurality of systems is made of 3 systems of the 1st to the 3rd, and the 1st system makes this system heat exchanger of process carry out cooled chilled water and turns back in above-mentioned reactor feedwater system or the fuel tank; The 2nd system makes this system heat exchanger of process carry out cooled chilled water and turns back in the above-mentioned fuel tank; The 3rd system makes the heat exchanger of this system of process carry out cooled chilled water and turns back in the above-mentioned fuel tank, simultaneously, above-mentioned fuel tank cooling and purifying systematic pipeline extracts above-mentioned fuel tank water, makes it by suppress the pond cleaning system and turn back to above-mentioned reactor well or machine is installed in the pond (installing local) temporarily after purifying.

If adopt the present invention, then make 3 systems of reactor waste removal system cool off running, be that about 50% of ratings turns round according to flow system flow, can have sufficient heat-removal capability.Because chilled water is turned back in fuel tank and the feedwater sprayer, so can reduce the radioactive ray raying dosage of reactor well.

Moreover fuel tank cooling and purifying system purifies running, and the pond cleaning system can turn back to reactor well or the machine adjacent with reactor well installed in the pond temporarily by suppressing when chilled water comes out from this filtration desalting plant.

Described invention is a kind of method of operation of reactor cooling device, this reactor cooling device has: the reactor well and the fuel tank of constructing by Chi Zha, has the fuel tank cooling and purifying systematic pipeline that filters desalting plant as the water source with at least one of this reactor well and fuel tank, be built up in the reactor pressure vessel of above-mentioned reactor well bottom, the reactor waste removal system pipeline that is connected and has heat exchanger with this reactor pressure vessel, the method of operation of this reactor cooling device is characterised in that: above-mentioned reactor waste removal system is made of 3 systems of the 1st to the 3rd, and the heat exchanger that is provided with respectively from 3 systems of above-mentioned the 1st system to the has at least 2 to be connected in series and to turn round.

If adopt the present invention, then, a plurality of reactor waste removal system heat exchanger in series turn round owing to connecting, so, can improve the thermal efficiency that removes of above-mentioned reactor waste removal system pipeline, chilled water is turned back in the reactor pressure vessel from low pressure water injection system or feedwater sprayer.

Excellent results of the present invention:

In nuclear power station, in the time of in entering reactor pressure vessel, can not influence operation according to the present invention, can reduce the radiation dosage in the reactor well, can eliminate the decay heat radiation.

Below embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Description of drawings

Fig. 1 is the system diagram that expression relates to the 1st embodiment of reactor cooling device of the present invention.

Fig. 2 is the system diagram that expression relates to the 2nd embodiment of reactor cooling device of the present invention.

Fig. 3 is other the routine system diagrams among expression the 2nd embodiment.

Fig. 4 is the system diagram that expression relates to the 3rd embodiment of reactor cooling device of the present invention

Fig. 5 is the system diagram that expression relates to the 4th embodiment of reactor cooling device of the present invention.

Fig. 6 is the part sectional drawing that expression relates to the 5th embodiment of reactor cooling device of the present invention.

Fig. 7 is the summary sectional drawing that expression relates to the 6th embodiment of reactor cooling device of the present invention.

Fig. 8 is the part sectional drawing that expression relates to the 7th embodiment of reactor cooling device of the present invention.

Fig. 9 is the summary sectional drawing that expression relates to the 8th embodiment of reactor cooling device of the present invention.

Figure 10 (a) is the summary sectional drawing that expression relates to the 9th embodiment of reactor cooling device of the present invention.

Figure 10 (b) is the LPFL sprayer amplification oblique drawing of Figure 10 (a).

Figure 11 (a) is the skiagraph of part side that expression relates to the 10th embodiment of reactor cooling device of the present invention.

Figure 11 (b) is the top figure of Figure 11 (a).

Figure 12 is the system diagram that expression relates to the 11st embodiment of reactor cooling device of the present invention.

Figure 13 is that explanation relates to the system diagram that the 1st embodiment of the method for operation of the 12nd embodiment of reactor cooling device of the present invention and reactor cooling device uses

Figure 14 is that explanation relates to the system diagram that the 2nd embodiment of method of operation of reactor cooling device of the present invention uses.

Figure 15 is that explanation relates to the system diagram that the 3rd embodiment of method of operation of reactor cooling device of the present invention uses.

Figure 16 is the system diagram of expression reactor cooling device in the past.

Embodiment

Utilize Fig. 1, describe the 1st embodiment of reactor cooling device of the present invention in detail.

In Fig. 1, for the part identical, mark identical symbol with Figure 16, omit explanation to repeating part.Present embodiment with in the past routine different place is: the position that the downstream side of the downstream side of fuel tank return line 17 and RHR-FPC communication pipeline 29 is connected is set to junction of two streams 48, connects FPC backwater injection pipeline 19 in these junction of two streams 48 top sets.And, shut-off valve 49 is set on fuel tank return line 17, outlet side from the non-return valve 18 of fuel tank return line 17 carries out branch again, connects FPC backwater flow line 51 by shut-off valve 50, connects the RHR backwater and inject pipeline 31 on this FPC backwater flow line 51.

That is to say, the piping system of present embodiment is constructed as follows: filter desalting plant 11 by FPC and clean, carry out cooled chilled water by FPC heat exchanger 13, inject pipeline 31 by fuel tank return line 17, FPC backwater flow line 51 and RHR backwater, turn back in the reactor well 4, simultaneously, the chilled water after being cooled in RHR systematic pipeline 23,24 injects pipeline 19 from RHR-FPC communication pipeline 29 by the FPC backwater and can turn back to independently in the fuel tank 5.

If adopt present embodiment, then the pipeline of the junction of two streams 48 that FPC system and RHR system are collaborated constitutes and estimates again, and the chilled water of FPC system and RHR system does not collaborate, and the FPC system can carry out the running returned in reactor well 4; The RHR system can carry out the running returned in fuel tank 5.Like this, because the chilled water that turns back in reactor and 4 is purified by FPC filtration desalting plant 11,, can reduce radioactive ray raying dosage significantly so dirt can not be deposited in the reactor well 4.

On the other hand, from eliminating the thermal-radiating viewpoint of decay, can open the pond gate 6 that is arranged between reactor well 4 and the fuel tank 5, both cool off to reactor well 4 and fuel tank 5, so that carry out comprehensive heat extraction.At this, 2 systems in Fig. 1 of RHR system suck from reactor pressure vessel 1, but also can be that 1 system sucks from reactor pressure vessel 1; Another system sucks from fuel tank 5.

And, in Fig. 1, on constituting, the water intaking side of FPC system with separate equalizing tank 7 and be connected, this equalizing tank 7 be arranged in fuel tank 5 and position that reactor well 4 is connected on.Separate in the equalizing tank 7 owing to enter into during the water overflow of fuel tank 5 and reactor well 4, so the water source of FPC is fuel tank 5 and reactor well 4.But, the water intaking side that realizes the FPC system that present embodiment adopts is not limited only to this for constituting, also can adopt a kind of like this formation, the intake of FPC system promptly is set on the top of fuel tank 5 or reactor well 4, directly fetches water from the top of fuel tank 5 or reactor well 4.Perhaps, the intake of FPC system is set on the bottom of reactor well 4, the one reactor well associated line 22 of the FPC shown in the fine rule among Fig. 1 is used for the water intaking of FPC system.No matter being any situation, on constituting, all is that the FPC system is fuel tank 5 or reactor well 4 or the two is as the water source.

Following according to Fig. 2, describe the 2nd embodiment of reactor cooling device of the present invention in detail.

In Fig. 2, for the part identical, mark identical symbol with Fig. 1, omit explanation to repeating part.

The present embodiment place different with the 1st embodiment is to be provided with a kind of RHR-FPC communication pipeline 29 and RHR are returned to inject pipeline 31 and couple together and have the 1st of the 1st transfer valve 103 and switch pipeline 104.And, on RHR-FPC communication pipeline 29, switch between the connecting portion of pipeline 104 and the junction of two streams 48 the 1st and to be provided with the 2nd transfer valve 105.

If adopt present embodiment, then can close the 1st transfer valve 103, open the 2nd transfer valve 105, the chilled water of reactor waste removal system pipeline 23,24 is turned back in the fuel tank 5 from backwater inlet 20 by FPC backwater injection pipeline 19.And, can open the 1st transfer valve 103, close the 2nd transfer valve 105, the chilled water of reactor waste removal system pipeline 23,24 is turned back in the reactor well 4.

Below with reference to the accompanying drawings 3, describe other examples of the 2nd embodiment in detail.

In Fig. 3, will mark identical symbol for the part identical with Fig. 1, omit explanation to repeating part.In this embodiment, be provided with a kind of like this 2nd and switch pipeline 106, promptly the one end carries out branch's connection from the entrance side that is installed in the non-return valve 18 on the fuel tank return line 17; The other end is connected with shut-off valve 50 on being installed in FPC backwater flow line 15.

If adopt this embodiment, the chilled water that then can make fuel tank cooling and purifying systematic pipeline 8, turns back in the reactor well 4 by shut-off valve 50, FPC backwater injection pipeline 51 and RHR backwater inlet 30 from the 2nd switching pipeline 106 by fuel tank return line 17.At this moment, utilize non-return valve 18, no matter the open and-shut mode of shut-off valve 49 how, can both prevent from from RHR system 23,24, to come comprise dirt in interior chilled water flows into reactor well 4.

Following according to Fig. 4, describe the 3rd embodiment of reactor cooling device of the present invention in detail.

In Fig. 4, for the part identical, mark identical symbol with Fig. 1, omit explanation to repeating part.The present embodiment place different with the 1st embodiment is: in the reactor waste removal system pipeline of a plurality of systems, the 1st or the 2nd system that is connected on the low pressure water injection system sprayer set in the reactor pressure vessel is connected on feedwater sprayer set in the above-mentioned reactor pressure vessel and the above-mentioned low pressure water injection system sprayer.

That is to say, carry out branch from RHR (A) systematic pipeline 23, a kind of take-off pipe 38 that is connected with the 1st feedwater sprayer pipeline 46 and has shut-off valve 39 is set, simultaneously, carry out branch from RHR (B or C) systematic pipeline 24, a kind of take-off pipe 52 that is connected with the 2nd feedwater sprayer pipeline 47 and has shut-off valve 53 is set.Like this, its formation can supply to the RHR chilled water in LPFL sprayer pipeline 45 and the 2nd feedwater sprayer pipeline 47 from RHR (B or C) systematic pipeline 24.

The RHR system is provided with 3 as mentioned above altogether.In the past, the system of RHR is connected in the system of water supply system (FDW system), and chilled water turns back in the reactor pressure vessel 1 from the feedwater sprayer 37 of a system.Feedwater sprayer 37 is provided with 3 in a system, be provided with 6 altogether in 2 systems, and in contrast, LPFL sprayer 36 is provided with 1 in 1 system, is provided with 2 altogether.So, to compare when LPFL sprayer 36 returns with making chilled water, the running that chilled water is returned from feedwater sprayer 37 is slowed down the flow velocity in the reactor pressure vessel 1, and operation is better.

If adopt present embodiment, then system's formation is to be connected to the system of RHR in 2 systems of water supply system (FPW), perhaps RHR2 system is connected in 2 systems of FDW, so, flow velocity in reducing reactor pressure vessel 1 turns back under the situation of this drive manner in the reactor pressure vessel 1 RHR system cools water, also can be to operation generation harmful effect, the decay heat radiation can be eliminated, also operation can be improved.

Following according to Fig. 5, describe the 4th embodiment of reactor cooling device of the present invention in detail.

In Fig. 5, for the part identical, mark identical symbol with Fig. 1, omit part to repeating part.Present embodiment is in the 1st embodiment for example, in the coolant outlet side pipe road system of the RHR heat exchanger 26 of RHR (A) systematic pipeline 23 and RHR (B or C) systematic pipeline 24, a kind of RHR between shut-off valve 55,56 is set filters desalting plant 54.And, the RHR that RHR filtration desalting plant 54 is carried out bypass is filtered the front and back that desalting plant bypass 57 is arranged on shut-off valve 55,56 by by-pass valve 58.Close at the following bypass valve 58 of situation that uses RHR to filter desalting plant 54.

If adopt present embodiment, then, RHR filtration desalting plant 54 comes the radiomaterial in the chilled water of RHR system is removed by being set, chilled water is purified, it is turned back in the reactor well 4, like this, the radioactivity raying dosage of reactor well 4 can be reduced, the decay heat radiation can be eliminated simultaneously.And, the tubular wire film filter can be set wait and replace RHR to filter desalting plant 54.And, under the less situation of the radiant in RHR system cools water, also can open by-pass valve 58, filter desalting plant by-pass valve 58 through RHR.

Following according to Fig. 6, describe the 5th embodiment of reactor cooling device of the present invention in detail.

In Fig. 6, for the part identical, mark identical symbol with Fig. 1, omit explanation to repeating part.Present embodiment with the difference of the 1st embodiment is: filter in the desalting plant 11 at the FPC of FPC systematic pipeline 8 and purify by separating fuel tank water that equalizing tank 7 obtains from fuel tank 5, in FPC heat exchanger 13, cool off, inject pipeline 19 by fuel tank return line 17 and FPC backwater and turn back in the fuel tank 5.

And heap water or fuel tank water in the reactor pressure vessel 1 also cool off in the RHR system, turn back to then in the fuel tank 5.In the case, the RHR system of a system makes in RHR heat exchanger 26 cooled chilled water turn back in the feedwater sprayer 37.Non-return valve 18 and shut-off valve 49 are connected in series in fuel tank return line 17.

If adopt present embodiment, then can reduce the radioactive ray raying dosage of reactor well 4, and improve long distance work refuelling in the reactor pressure vessel 1 etc. by reducing the flow velocity of the backwater in the reactor pressure vessel 1.And, for the flow velocity in the limited reactions core pressure vessel 1, preferably be set to the return flow of feedwater sprayer 37 the RHR systematic pipeline flow about 50%.

Following according to Fig. 7, describe the 6th embodiment of reactor cooling device of the present invention in detail.

In Fig. 7, for the part identical, mark identical symbol with Fig. 1, omit explanation to repeating part.Present embodiment with the difference of embodiment in the past is: reactor well water intaking pipeline 59 is connected on RHR (A) systematic pipeline 23 or RHR (B or the C) systematic pipeline 24; Reactor well top intake 60 is installed to the upper end of this reactor well water intaking pipeline 59.And, carry out branch from the upstream side of inlet shut-off valve 9, separate equalizing tank fetch water an end of pipeline 61 be connected to separate the FPC pipeline 8 that equalizing tank 7 is connected on; The other end of this separation equalizing tank water intaking pipeline 61 is connected on RHR (A) system 23 or RHR (B or the C) systematic pipeline 24 by shut-off valve 62.

Flow into when the top water of fuel tank 5, i.e. the primary water overflow of cleaning and separate in the equalizing tank 7.The natural convection that reactor decay heat radiation produces raises the upper temp of reactor well 4.Therefore, in present embodiment, from the reactor well top suction inlet 60 that is connected with RHR systematic pipeline 23 or 24, take out the top water of reactor well 4, perhaps from separate equalizing tank water intaking pipeline 61, take out the top water of fuel tank 5, after these top water are cooled off in the RHR of RHR systematic pipeline 23 or 24 heat exchanger 26 it is turned back in the reactor well 4.

If adopt present embodiment, the water-quality ratio on the top of the top of reactor well 4 and fuel tank 5 heap water cleaning then, so, can reduce the radioactive ray raying dosage of reactor well 4.And, do not need to make the chilled water of RHR systematic pipeline to turn back in the reactor pressure vessel 1, can not impact remote operated operation yet.

Following according to Fig. 8, describe the 7th embodiment of reactor cooling device of the present invention in detail.

Fig. 8 is the vertical section enlarged drawing of overview of center line 67 left part of the reactor well 4 of presentation graphs 1 to Fig. 7.And, the part of symbol 1 expression reactor pressure vessel, symbol 63 is overviews of representing the reactor well sprayer with vertical section.The A that the direction of the arrow that the central point from reactor well sprayer 63 is drawn marks, B, C, D represent to be arranged on the direction that being used on the reactor well sprayer 63 spray the injection orifice of chilled water.

Symbol 64 is the connection materials that the bottom that the upper end of reactor pressure vessel 1 is installed in reactor well 4 carried out water-stop, the 65th, and the bight of reactor well, the 66th, seawall.In reactor pressure vessel 1, store heap water.

Among the embodiment in the past, from constituting, on A, the B of reactor well sprayer 63, C direction injection orifice is set, chilled water sprays to this direction.But the problem of existence is: 65 places accumulate dirt in the reactor well bight, when the operating personnel takes out stains after reactor 34 is discharged water, are subjected to radiation.

Therefore, in the present embodiment, not under reactor well corner portion 65, promptly B direction and wall tiltedly descend direction, are on the C direction injection orifice to be set, but towards the tiltedly down direction of center line 67, be the A direction and towards the horizontal direction of center line 67, be on the D direction injection orifice to be set.If adopt present embodiment, then from the injection orifice of A direction and D direction, spray chilled water, like this, in the bottom of reactor well 4, especially corner portion 65 is difficult to accumulate dirt, can reduce the radioactive radiation that the operating personnel is subjected to when the dirt of cleaning reaction heap well 4.

Following according to Fig. 9, describe the 8th embodiment of reactor cooling device of the present invention in detail.

Fig. 9 is that the reactor well 4 of presentation graphs 1 to Fig. 7 and the part of reactor pressure vessel 1 overview are amplified skiagraph.In Fig. 9, symbol 68 is protective devices, the 69th, and guard shield.Present embodiment has been installed protective device (masking device) 68, and LPFL sprayer 36 tops and the outside that is arranged in the reactor pressure vessel 1 hidden.

In the present embodiment, cooled chilled water utilizes LPFL sprayer 36 that it is turned back in the reactor pressure vessel 1 in RHR (B or C) systematic pipeline 24.At this moment, masking device 68 is installed on LPFL sprayer 36, is dropped onto between block cover 69 and the reactor pressure vessel 1, can prevent to spray to the center position of reactor pressure vessel 1 from the backwater of LPFL sprayer 36.Like this, can limit that dirt is brought in the reactor well 4, reduce the radiation in the reactor well, not hinder the operation when coming near reactor pressure vessel, can eliminate the decay heat radiation in the remote-controlled operation mode.

Following according to Figure 10 (a) and (b), describe the 9th embodiment of the reactor cooling device of the invention relate to claim 8 in detail.

The same part overview of representing reactor well 4 and reactor pressure vessel 1 with sectional drawing of Figure 10 (a) with Fig. 9; Figure 10 (b) represents the part situation of the LPFL sprayer 36 among Figure 10 (a) with amplification oblique drawing.

Present embodiment be a plurality of roses 70 be seated in LPFL sprayer 36 in the reactor pressure vessel 1 below, make the chilled water ejiction opening 71 of this rose 70 downward, under promptly being arranged on.

The rose of the LPFL sprayer 36 in past be installed in LPFL sprayer 36 above, the centre is bent, the injection orifice of chilled water is towards the center line of reactor pressure vessel.In contrast, present embodiment is installed in LPFL rose 70 below the LPFL sprayer 36, makes ejiction opening 71 downward, and therefore, chilled water can not be ejected into the center position of reactor pressure vessel 1.

The recovering state work of carrying out RHR refuel mode according to present embodiment in reactor pressure vessel 1 can not produce the problem of rocking of fuel etc. yet.Therefore, can limit that dirt is brought in the reactor well, can reduce the radiation of reactor well.And because only change rose, so can reduce the quantity of transforming article.

Following according to Figure 11 (a) and (b), describe the 10th embodiment of reactor cooling device of the present invention in detail.

Figure 11 (a) is the summary amplification profile diagram of the fuel tank 5 among Fig. 1 to Fig. 7.Figure 11 (b) is the top figure of Figure 11 (a).In Figure 11 (a) and (b), symbol 72 is fuel tank inner structure parts, the fuel storage frame of for example using, and the 73rd, vertical pipe, the 74th, the fan diffuser that is connected with vertical pipe 73,75 are arranged on a plurality of apertures on the fan diffuser 74.

Present embodiment divides 2 fan diffusers 74 of two-layer installation up and down on per 1 vertical tube 73 in fuel tank 5, in the both sides of fuel tank inner structure part 72 vertical tube 73 is installed respectively respectively.Many the small-bore chilled water ejiction openings 75 that are used to spray chilled water are set on fan diffuser 74.The quantity of this fan diffuser 74 is not limited only to 4, can increase according to the amount of content and chilled water or reduce.The FPC that vertical tube 73 is equivalent to Fig. 1 among the 1st embodiment returns into injection pipeline 19, and fan diffuser 74 is equivalent to backwater inlet 20.

For example, shown in the 1st embodiment, when needs make a large amount of chilled waters turn back to running in the fuel tank 5, the bore of the fan diffuser 74 in the fuel tank 5 is increased, this is disadvantageous to the layouts in the fuel tank 5.On the other hand, from the cooling viewpoint of fuel tank 5, preferably fan diffuser 74 is arranged in the bottom of fuel tank 5.

Therefore, shown in Figure 11 (a) and (b),, its bore is enlarged in order to make the vertical tube 73 that stretches to fuel tank 5 bottoms can adapt to the increase of flow.On the other hand, the fan diffuser 74 that is provided with at fuel tank 5 bottom levels is shown in Figure 11 (a), on a vertical tube 73, divide two-layer up and down 2 fan diffusers that are provided with, and, as the both sides of Figure 11 (b) fuel tank inner structure part 72 that is shown in a vertical tube 73 is set respectively respectively.

According to present embodiment, can prevent that pipe diameter from enlarging, and helps the layout in the fuel tank 5.Therefore, in nuclear power plant, come not influence operation near in the reactor pressure vessel 1 time, can reduce the radiation amount, can eliminate the decay heat radiation in the remote-controlled operation mode.

And, in Figure 11, the situation that two-layer fan diffuser 74 is set is illustrated.But also can adopt the structure that is provided with more than 3 layers, at this moment also can obtain the action effect identical with above-mentioned situation.

Following according to Figure 12, describe the 11st embodiment of reactor cooling device of the present invention in detail.

Present embodiment as shown in figure 12, A, the B system of the feedwater sprayer 37 in the reactor pressure vessel 1 all come but materials purification system (hereinafter to be referred as CUW) 76 of coupled reaction cooling in heap by shut-off valve 77, CUW systematic pipeline 78, shut-off valve 79, non-return valve 80,81,82 and water supply system shut-off valve 83, especially in water supply system (A system), be provided with and have the non-return valve 84 of forcing holding function, replace non-return valve 80.

What is called has the non-return valve 84 of forcing holding function, is meant that the sort of flow direction of purifying waste water is not only to have one, but can forcibly opens the non-return valve that has handgrip of opposite water (flow) direction as required.In Figure 12, symbol 85 is reactor safety shells, expresses a part.And branch of reactor feedwater system (A system) is connected on RHR (A) systematic pipeline 23.

The example in past, its formation is: RHR (A) systematic pipeline 23 only turns back on the 1st feedwater sprayer pipeline 46 of water supply system 35.But present embodiment is to be provided with the non-return valve 84 of forcing holding function, by this non-return valve 84 is transferred to the positive opening state, can make chilled water from RHR (A) systematic pipeline 23 turn back to the 1st feedwater sprayer pipeline (A system) the 46 and the 2nd feedwater sprayer pipeline (B series) 47 of reactor feedwater system 35 in the two.

According to present embodiment, utilization is installed in shut-off valve 79 or the water supply system shut-off valve 83 on the CUW systematic pipeline 78, chilled water from the RHR system is turned back in the 1st feedwater sprayer (A system) the 46 or the 2nd feedwater sprayer (B system) 47, can make refuelling etc. enter the minimum that influences that operation in the reactor pressure vessel 1 is subjected to, can eliminate the decay heat radiation again.

And shut-off valve 79 or feedwater shut-off valve 83 can adopt hand valve, also can adopt motorized valve.Under the situation that adopts motorized valve, can improve operability.

Following according to Figure 13, describe the 12nd embodiment of reactor cooling device of the present invention in detail.

In Figure 13, for the part identical, mark identical symbol with Fig. 1, omit explanation to repeating part.The difference of present embodiment and the 1st embodiment is: from the suction inlet of the RHR pump 25 of RHR (B or C) systematic pipeline 24 to upstream side branch, connect a kind of CUW regenerative heat exchanger 86 that has been connected in series, CUW non-regenerative heat exchanger 87, CUW pump 88 and CUW filter the CUW systematic pipeline 78 of desalting plant 89, simultaneously CUW return line 93 are connected in the reactor feedwater system 35.

And, CUW regenerative heat exchanger 86 is connected with CUW return line 93 by shut-off valve 90, the outlet side that filters desalting plant 89 from CUW carries out branch simultaneously, with CUW return line 93 between be connected CUW bypass line 91, by-pass valve 92 is arranged on the CUW bypass line 91.

According to present embodiment, CUW regenerative heat exchanger 86 is carried out by-pass operation, do not hinder operation in the time of can be in the reactor pressure vessel 1 that enters into nuclear power station in the remote-controlled operation mode, can reduce radiation dosage, improve the thermal-radiating removal efficient of decay.

Following according to Figure 13, describe the 1st embodiment of the method for operation of reactor cooling device of the present invention in detail.

In the 1st embodiment of the reactor cooling device of the above-mentioned invention that relates to claim 1, as shown in Figure 1, by-pass valve 14 closing state that expression FPC filters desalting plant 11.Present embodiment is characterized in that making by-pass valve 14 to be in open mode and turns round as shown in figure 13.By opening by-pass valve 14, the fuel tank discharge of discharging from FPC pump 10 increases, and promptly the current that filter desalting plant 11 to FPC add with the current that flow through FPC bypass line 15 and are in the same place, and flow in the FPC heat exchanger 13.

Thereupon, the chilled water that is cooled in FPC heat exchanger 13 injects pipeline 31 from fuel tank return line 17 by the RHR backwater, flow in the reactor well 4, flow into simultaneously in the reactor pressure vessel 1.

According to present embodiment, the by-pass valve 14 that makes FPC filter desalting plant 11 turns round under open mode, and the flow of FPC system is increased, and the flow of FPC heat exchanger 13 is increased, and therefore can improve the thermal efficiency that removes of FPC systematic pipeline.So, can not influence operation when in nuclear power station, entering in the reactor pressure vessel by remote manipulation, can reduce radiation dosage, eliminate the decay heat radiation.

Following according to Figure 14, describe the 2nd embodiment of the method for operation of reactor cooling device of the present invention in detail.

In Figure 14, for the part identical, mark identical symbol with Fig. 1, omit explanation to repeating part.In Figure 14, RHR (A) systematic pipeline 23 is called the 1st system; The B system of RHR (B or C) systematic pipeline 24 is called the 2nd system; Equally, the C system is called the 3rd system.

Present embodiment carries out a kind of like this running: make that cooled chilled water turns back in the reactor feedwater system 35 in the 1st system, making in the 2nd system cooled chilled water inject pipeline 19 from RHR-FPC straight line associated line 29 by backwater turns back in the fuel tank 5, in the 3rd system, take out fuel tank water, in RHR heat exchanger 26, after the cooling it is turned back in the above-mentioned fuel tank 5.And FPC pipeline 8 carries out a kind of like this running: take out fuel tank water, filter at FPC and make after purifying in the desalting plant 11 it turn back to reactor well 4 or be provided with in the (not shown) of pond with the machine of reactor well 4 adjacent settings temporarily from SPCU pipeline 16.

According to present embodiment, the thermal-radiating removal that decays is carried out in RHR heat exchanger 26, and the FPC system is the method for operation that purification function is only arranged.So 3 systems of RHR are used for the cooling running, are about 50% of ratings according to flow system flow and turn round, and like this, have sufficient heat-removal capability, and it is turned back in fuel tank 5 and the reactor feedwater system 35, can reduce the radiation of reactor well 4.

And the FPC system purifies running, when flowing out from FPC filtration desalting plant 11, by SPCU systematic pipeline 16, can turn back to reactor well 4 or machine the place is set temporarily.Like this, when in nuclear power station, entering in the reactor pressure vessel 1 by remote manipulation, can not influence operation, can reduce radiation dosage, can eliminate the decay heat radiation.

Following according to Figure 15, describe the 3rd embodiment of the method for operation of reactor cooling device of the present invention in detail.

In Figure 15, for the part identical, mark identical symbol with Fig. 1, omit explanation to repeating part.In Figure 15, RHR (A) systematic pipeline 23 and RHR (B or C) systematic pipeline 24 RHR heat exchanger 26 separately, binding pipeline 94 in that outlet side and entrance side are connected in series connects by shut-off valve 95, RHR non-return valve 96 is connected on the discharge oral-lateral of RHR pump 25; Heat exchanger outlet side closure valve 97 is connected on the outlet side RHR systematic pipeline of RHR heat exchanger 26.

Between the outlet side of the outlet side of RHR non-return valve 96 and heat exchanger outlet side closure valve 97, carry out branch, connect RHR heat exchanger bypass line 98, by-pass valve 99 is installed on this bypass line 98.Between the shut-off valve 95,95 of RHR heat exchanger binding pipeline 94, carry out branch, connect radwaste system communication pipeline 100, radwaste system communication pipeline 100 is connected on the radioactive waste treatment facility 102 by shut-off valve 101.

According to present embodiment, the RHR heat exchanger 26 of RHR (A) systematic pipeline 23 and RHR (B or C) systematic pipeline 24 and radwaste system communication pipeline 100 and RHR heat exchanger bypass line 98 are carried out system to be connected, to the running that is connected in series of a plurality of RHR heat exchangers 26, like this, can improve the thermal-radiating efficient of removing of decay, operation can be do not hindered, radiation dosage can be reduced.

And in Figure 13, it is interior for example is illustrated to turn back to fuel tank 5 from RHR system cools water, but also can turn round like this, even chilled water turns back in the reactor pressure vessel 1 from LPFL sprayer 36 or feedwater sprayer 37.

Excellent results of the present invention:

In nuclear power station, in the time of in entering reactor pressure vessel, can not influence operation according to the present invention, can reduce the radiation dosage in the reactor well, can eliminate the decay heat radiation.

Claims (13)

1. reactor cooling device is characterized in that having: the reactor well and the fuel tank of constructing by the pond gate; At least one of this reactor well and fuel tank has the fuel tank cooling and purifying systematic pipeline that filters desalting plant as the water source; Be built up in the reactor pressure vessel of above-mentioned reactor well bottom; And be connected with this reactor pressure vessel, have the reactor waste removal system pipeline of a plurality of systems of heat exchanger,

The backwater inlet of the fuel tank return line that the downstream side with above-mentioned fuel tank cooling and purifying systematic pipeline is connected is arranged in the above-mentioned reactor well, and the backwater inlet of the downstream side return line of above-mentioned reactor waste removal system pipeline is arranged in the above-mentioned fuel tank.

2. reactor cooling device is characterized in that having: the reactor well and the fuel tank of constructing by the pond gate; At least one of this reactor well and fuel tank has the fuel tank cooling and purifying systematic pipeline that filters desalting plant as the water source; Be built up in the reactor pressure vessel of above-mentioned reactor well bottom; And be connected with this reactor pressure vessel, have the reactor waste removal system pipeline of a plurality of systems of heat exchanger,

The backwater inlet of the fuel tank return line that the downstream side with above-mentioned fuel tank cooling and purifying systematic pipeline is connected is arranged in the above-mentioned reactor well, the backwater inlet of the downstream side return line of above-mentioned reactor waste removal system pipeline is arranged in the above-mentioned fuel tank, and be provided with a kind of blocked operation pipeline, this pipeline can make the chilled water of above-mentioned fuel tank cooling and purifying systematic pipeline turn back to above-mentioned fuel tank or above-mentioned reactor well, and the chilled water of above-mentioned reactor waste removal system pipeline is turned back in above-mentioned reactor well or the above-mentioned fuel tank.

3. reactor cooling device as claimed in claim 1 or 2, it is characterized in that: in the reactor waste removal system pipeline of above-mentioned a plurality of systems, have at least a system to be connected on the feedwater sprayer set in the above-mentioned reactor pressure vessel, and branch is connected on the low pressure water injection system sprayer set in the above-mentioned reactor pressure vessel.

4. reactor cooling device as claimed in claim 1, it is characterized in that: by non-return valve and shut-off valve, fuel tank cooling and purifying system backwater is injected pipeline be connected on the above-mentioned fuel tank return line, the outlet side pipeline of cooled chilled water in the heat exchanger set in above-mentioned reactor waste removal system is connected on above-mentioned fuel tank cooling and purifying system's backwater injection pipeline and the reactor feedwater systematic pipeline.

5. reactor cooling device as claimed in claim 1 is characterized in that:

Filtrator or filtration desalting plant, be arranged in the coolant outlet side pipe road system of above-mentioned reactor waste removal system pipeline.

6. reactor cooling device as claimed in claim 1 or 2, it is characterized in that: at least one reactor well sprayer that is connected with the above-mentioned return line of above-mentioned reactor waste removal system pipeline, be set in the above-mentioned reactor well, the cooling water outlet of above-mentioned reactor well sprayer, be separately positioned on towards the oblique direction down of above-mentioned reactor pressure vessel center line with on the horizontal direction of above-mentioned center line.

7. reactor cooling device as claimed in claim 1 or 2 is characterized in that being provided with a kind of device, and this device is set at the water (flow) direction that sprays the low pressure water injection system sprayer in being arranged on above-mentioned reactor pressure vessel downwards.

8. reactor cooling device as claimed in claim 1 or 2 is characterized in that: in above-mentioned fuel tank the fan diffuser with a plurality of chilled water squit holes is arranged to a plurality of column plate shapes.

9. reactor cooling device as claimed in claim 1 or 2 is characterized in that: the 1st water-supply line and the 2nd water-supply line, be connected on the feedwater sprayer that is arranged on 2 systems in the above-mentioned reactor pressure vessel; These water-supply lines respectively by the 1st non-return valve and the 2nd non-return valve, are connected on the reactor coolant cleaning system pipeline; This reactor coolant cleaning system pipeline, between above-mentioned the 1st water-supply line and the 1st non-return valve, be connected on the above-mentioned reactor waste removal system pipeline, and, above-mentioned the 1st non-return valve as the non-return valve that has the positive opening function.

10. reactor cooling device as claimed in claim 3, it is characterized in that: setting connects from above-mentioned reactor waste removal system line branches, reactor coolant cleaning system pipeline with regenerative heat exchanger and filtration desalting plant, the reactor coolant cleaning system return line that is connected with the outlet side of the filtration desalting plant of this reactor coolant cleaning system pipeline, be connected to above-mentioned reactor feedwater systematic pipeline that above-mentioned feedwater sprayer is connected on, on above-mentioned reactor coolant cleaning system return line, the reactor coolant cleaning system bypass line that above-mentioned heat exchanger is carried out bypass is set.

11. reactor cooling device as claimed in claim 1, it is characterized in that: on the filtration desalting plant of above-mentioned fuel tank cooling and purifying systematic pipeline, be provided with bypass line with by-pass valve, open by above-mentioned by-pass valve, can increase the flow in the heat exchanger that enters into above-mentioned fuel tank cooling and purifying systematic pipeline this bypass line.

12. reactor cooling device as claimed in claim 10, it is characterized in that: the reactor waste removal system of above-mentioned a plurality of systems is made of 3 systems of the 1st to the 3rd, the 1st system makes through this system heat exchanger and carries out cooled chilled water, turns back in above-mentioned reactor feedwater systematic pipeline or the above-mentioned fuel tank; The 2nd system makes the heat exchanger through this system carry out cooled chilled water, turns back in the above-mentioned fuel tank; The 3rd system makes the heat exchanger through this system carry out cooled chilled water, turn back in the above-mentioned fuel tank, and, above-mentioned fuel tank cooling and purifying systematic pipeline extracts above-mentioned fuel tank water, makes it by suppress the pond cleaning system and turn back to above-mentioned reactor well or machine is installed in the pond temporarily after purifying.

13. reactor cooling device as claimed in claim 12, it is characterized in that: above-mentioned reactor waste removal system is made of 3 systems of the 1st to the 3rd, and the heat exchanger that is provided with respectively from 3 systems of above-mentioned the 1st system to the has at least 2 to be connected in series and to turn round.

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