CN113266594A - Annular space ventilation system and method - Google Patents
Annular space ventilation system and method Download PDFInfo
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- CN113266594A CN113266594A CN202110389548.XA CN202110389548A CN113266594A CN 113266594 A CN113266594 A CN 113266594A CN 202110389548 A CN202110389548 A CN 202110389548A CN 113266594 A CN113266594 A CN 113266594A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/04—Safety arrangements
- G21D3/06—Safety arrangements responsive to faults within the plant
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/02—Treating gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention belongs to the technical field of design of a ventilation system of a nuclear power station, and particularly relates to an annular space ventilation system which comprises a normal series, a safety series I, a safety series II, an electric fire damper b, a check valve c, a fire damper c, an electric fire damper d, a soft joint a and a chimney; one end of the normal series is sequentially connected with a fire valve c, a check valve c and an air outlet b, and the other end of the normal series is sequentially connected with an electric fire valve d, a soft joint a and a chimney; one end of the safety series is sequentially connected with a fire valve c, a check valve c and an air outlet b, and the other end of the safety series is sequentially connected with an electric fire valve d, a soft joint a and a chimney; one end of the safety series II is connected with an air outlet a, and the other end of the safety series II is sequentially connected with an electric fireproof valve b, a soft joint a and a chimney. The invention solves the system design problem of maintaining the negative pressure in the annular space, improves the system operability and the automatic control of the system under the condition of fire, and improves the safety and the reliability of the operation of the nuclear power station.
Description
Technical Field
The invention belongs to the technical field of design of ventilation systems of nuclear power stations, and particularly relates to an annular space ventilation system and method.
Background
In recent years, with the continuous development of pressurized water reactor technology, millions of kilowatt-level third-generation nuclear power units internationally adopt a double-layer containment structure. The design of the dual containment annular space system varies from reactor to reactor. A certain type of double-layer containment vessel is of a concrete structure, and an annular space ventilation system is arranged between the double-layer containment vessels. When the negative pressure to be maintained in the annular space of the containment is calculated, only the influence caused by outdoor wind load is considered, and the diffusion effect caused by the concentration difference of radioactive substances is not considered. The system accident exhaust fan adopts a double-speed fan, the fan has small flow and a high pressure head, and the minimum negative pressure value required by an annular space is difficult to achieve and maintain in the debugging and running processes.
The annular space of a certain reactor type containment is provided with a blowing and exhausting system, and the pressure difference between the annular space and the external environment is controlled by the air volume difference of the blowing and exhausting system. The designed negative pressure value of the annular space of the containment vessel is 100-400 Pa, and when the negative pressure in the annular space exceeds the range, an operator needs to manually start or stop the system so as to meet the pressure value in the annular space of the containment vessel.
A certain type of double-layer containment vessel is composed of a steel containment vessel and a shielding structure. Different from the annular space of the containment, the shielding structure is communicated with the external atmosphere, and the main function of the shielding structure is to lead out the waste heat in the reactor under the accident condition.
It is therefore desirable to provide an annular plenum and method that addresses the deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide an annular space ventilation system and an annular space ventilation method, which solve the problem of system design for maintaining negative pressure in an annular space, improve the system operability and the automatic control of the system under the condition of fire and improve the safety and the reliability of the operation of a nuclear power station.
The technical scheme for realizing the purpose of the invention is as follows:
an annular space ventilation system comprises a normal series, a safety series I, a safety series II, an electric fire damper b, a check valve c, an electric fire damper d, a soft joint a and a chimney;
one end of the normal series is sequentially connected with an electric fire valve c, a check valve c and an air outlet b, and the other end of the normal series is sequentially connected with an electric fire valve d, a soft joint a and a chimney; one end of the safety series is sequentially connected with an electric fire valve c, a check valve c and an air outlet b, and the other end of the safety series is sequentially connected with an electric fire valve d, a soft joint a and a chimney; one end of the safety series II is connected with an air outlet a, and the other end of the safety series II is sequentially connected with an electric fireproof valve b, a soft joint a and a chimney.
The normal series of the fire-fighting water purifier comprises a manual balance valve, an electric isolation valve a, an electric isolation valve b, a filter box body c, a manual isolation valve e, a soft joint b, a fan c, a soft joint c and a check valve e, wherein the manual balance valve, the electric isolation valve a, the electric isolation valve b, the filter box body c, the manual isolation valve e, the soft joint b, the fan c, the soft joint c and the check valve e are connected sequentially through a pipeline, the electric fire-fighting valve c, the check valve c and an air outlet b are connected to the other end of the manual balance valve, and the electric fire-fighting valve d, the soft joint a and a chimney are connected to the other end of the check valve e.
The first safety series comprises a manual isolation valve c, an electric heater b, a filter box body b, a manual fire prevention valve c, an iodine adsorber b, a manual fire prevention valve d, a manual isolation valve d, a soft joint d, a fan b, a soft joint e and a check valve d, wherein the manual isolation valve c, the electric heater b, the filter box body b, the manual fire prevention valve c, the iodine adsorber b, the manual fire prevention valve d, the manual isolation valve d, the soft joint d, the fan b, the soft joint e and the check valve d are sequentially connected through a pipeline; the other end of the manual isolation valve c is connected with the electric fire valve c, the check valve c and the air outlet b, and the other end of the check valve d is connected with the electric fire valve d, the soft joint a and the chimney.
The second safety series comprises a check valve a, a fire valve a, a manual isolation valve a, an electric heater a, a filter box body a, a manual fire valve a, an iodine adsorber a, a manual fire valve b, a manual isolation valve b, a soft joint f, a fan a, a soft joint g and a check valve b, wherein the check valve a, the fire valve a, the manual isolation valve a, the electric heater a, the filter box body a, the manual fire valve a, the iodine adsorber a, the manual fire valve b, the manual isolation valve b, the soft joint f, the fan a, the soft joint g and the check valve b are sequentially connected through pipelines; the other end of the check valve a is connected with the exhaust port a, and the other end of the check valve b is sequentially connected with the electric fireproof valve b, the soft joint a and the chimney.
The normal series, the safety series I and the safety series II are arranged in different rooms, and the safety series I and the safety series II are supplied with power by different power supply series.
The electric isolation valve a and the electric isolation valve b can ensure that radioactive gas cannot leak to the environment through the shell under the working conditions of power loss and mechanical fault accidents of the annular space.
And the fan a and the fan b are both provided with a 1E-level frequency converter to adjust the air volume of the fans.
And the fan c is provided with a non-1E-level frequency converter to adjust the air volume of the fan.
The safety system comprises a check valve c, a check valve c and an annular space outer wall penetrating piece, the check valve c and an electric fire valve c, and connecting air pipes between the electric fire valve d and a soft joint a are coated in a fireproof mode.
The safety series comprises two stop return valves a, a check valve a and an annular space outer wall penetrating piece, and connecting air pipes between the check valve a and an electric fire-proof valve a and between the electric fire-proof valve b and a soft joint a are coated in a fireproof mode.
The iodine adsorber a and the iodine adsorber b are III-type iodine adsorbers.
The manual isolation valve c and the manual isolation valve d support an electric heater b, a filter box body b, a manual fire prevention valve c, an iodine adsorber b and the manual fire prevention valve d in an online maintenance safety series.
The manual isolation valve a and the manual isolation valve b support an electric heater a, a filter box body a, a manual fire prevention valve a, an iodine adsorber a and a manual fire prevention valve b in an online maintenance safety series two.
The ventilation method of the annular space ventilation system comprises the following steps:
after a containment annular space tightness test is qualified, manually starting a normal series of fans c in a frequency conversion mode in a main control room, and keeping continuous operation;
step two, when the radioactivity level of the annular space exceeds a certain threshold value, the normal series is isolated by closing the electric isolation valve a and the electric isolation valve b, the normal series fan c is stopped, and the safety series second fan a is automatically started;
if the second safety series of fans fails to start, the second safety series of fans are started in an emergency or protected mode after being delayed for a plurality of seconds through the radiation dose high signal;
and step four, if the automatic commands are invalid, directly and manually starting a power frequency operation mode of a safety series second fan a or a safety series first fan b in the main control room, and forbidding switching to a power frequency operation mode of a normal series fan c.
The invention has the beneficial technical effects that:
(1) the normal series and the safe series of the invention are arranged independently and physically separated, thereby reducing the mutual influence among the three systems and improving the mutual independence and reliability of the ventilation system; the invention adopts a fire-proof covering air pipe form, thereby reducing the influence of general fire on the ventilation of the annular space;
(2) the normal series and the different safety series can independently ventilate the annular space, and when the radioactivity level of the annular space exceeds a certain threshold value, the normal ventilation series are isolated by closing the isolation valve, and the normal series of fans are stopped. The system is automatically switched to a filtering series, a high-efficiency particle air filter in the filtering series filters large-particle radioactive aerosol, and an iodine adsorber adsorbs radioactive iodine and methyl iodine. Through the automatic switching of the electric isolation valve, the risk of misoperation of personnel is reduced, and the reliability of the ventilation system is improved. The direct flow of polluted air to the environment is avoided under the accident condition, and the reliability and the safety of the power station are improved.
(3) In the invention, two normal series of electric isolation valves are arranged in series and are powered by different series of power supplies, and when power is lost, the electric isolation valves are automatically closed; the invention automatically adjusts the power of the electric heater at the front end of the safety-series iodine adsorber according to the air quantity required by the system for maintaining the negative pressure of the annular space, thereby ensuring the reliable operation of the safety series.
(4) The 1E-level frequency conversion technology is applied to a safety-level annular space ventilation system for the first time. The pressure difference in the annular space of the containment can be dynamically adjusted according to the measured value; the leakage rate of the inner containment and the outer containment is reasonably determined, and the air quantity and the pressure head of the fan of the annular space ventilation system are reasonably matched on the premise of meeting the safety requirement.
Drawings
FIG. 1 is a schematic view of an annular space ventilation system according to the present invention;
in the figure: 1-air outlet a; 2-air outlet b; 3-check valve a; 4-electric fire damper a; 5-manual isolation valve a; 6-electric heater a; 7-filter housing a; 8-manual fire damper a; 9-iodine adsorber a; 10-manual fire damper b; 11-manual isolation valve b; 12-fan a; 13-check valve b; 14-electric fire damper b; 15-check valve c; 16-electric fire damper c; 17-manual isolation valve c; 18-electric heater b; 19-filter housing b; 20-manual fire damper c; 21-iodine adsorber b; 22-manual fire damper d; 23-manual isolation valve d; 24-a fan b; 25-check valve d; 26-electric fire damper d; 27-a manual balancing valve; 28-electrically operated isolation valve a; 29-electrically operated isolation valve b; 30-filter housing c; 31-manual isolation valve e; 32-a fan c; 33-check valve e; 34-soft joint a; 35-soft joint b; 36-soft joint c; 37-soft joint d; 38-soft joint e; 39-soft joint f; 40-soft joint g; 41-chimney.
Detailed Description
In order to make those skilled in the art better understand the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention. It should be apparent that the embodiments described below are only some, but not all, of the embodiments of the present invention. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present invention.
As shown in fig. 1, the ventilation system for an annular space provided by the present invention comprises a normal series, a safety series one, a safety series two, an electric fire damper b14, a check valve c15, an electric fire damper c16, an electric fire damper d26, a soft joint a34 and a chimney 41, wherein negative pressure in the annular space is maintained by exhausting air in the normal series, the safety series one or the safety series two.
One end of the normal series is sequentially connected with an electric fire damper c16, a check valve c15 and an air outlet b2, and the other end is sequentially connected with an electric fire damper d26, a soft joint a34 and a chimney 41; one end of the safety series is sequentially connected with an electric fire damper c16, a check valve c15 and an air outlet b2, and the other end is sequentially connected with an electric fire damper d26, a soft joint a34 and a chimney 41; one end of the safety series II is connected with an air outlet a1, and the other end is sequentially connected with an electric fire damper b14, a soft joint a34 and a chimney 41.
The normal series comprises a manual balance valve 27, an electric isolation valve a28, an electric isolation valve b29, a filter box c30, a manual isolation valve e31, a soft joint b35, a fan c32, a soft joint c36 and a check valve e33, wherein the manual balance valve 27, the electric isolation valve a28, an electric isolation valve b29, the filter box c30, the manual isolation valve e31, the soft joint b35, the fan c32, the soft joint c36 and the check valve e33 are connected through pipelines in sequence, the electric fire valve c16, the check valve c15 and an exhaust port b2 are connected to the other end of the manual balance valve 27, and the electric fire valve d26, the soft joint a34 and a chimney 41 are connected to the other end of a check valve e 33.
The first safety series comprises a manual isolation valve c17, an electric heater b18, a filter box b19, a manual fire valve c20, an iodine adsorber b21, a manual fire valve d22, a manual isolation valve d23, a soft joint d37, a fan b24, a soft joint e38 and a check valve d25, wherein the manual isolation valve c17, the electric heater b18, the filter box b19, the manual fire valve c20, the iodine adsorber b21, the manual fire valve d22, the manual isolation valve d23, the soft joint d37, the fan b24, the soft joint e38 and the check valve d25 are connected in sequence through pipelines; the other end of the manual isolation valve c17 is connected with an electric fire damper c16, a check valve c15 and an air outlet b2, and the other end of the check valve d25 is connected with an electric fire damper d26, a soft joint a34 and a chimney 41.
The second safety series comprises a check valve a3, a fire valve a4, a manual isolation valve a5, an electric heater a6, a filter box body a7, a manual fire valve a8, an iodine adsorber a9, a manual fire valve b10, a manual isolation valve b11, a soft joint f39, a fan a12, a soft joint g40 and a check valve b13, wherein the check valve a3, the fire valve a4, the manual isolation valve a5, the electric heater a6, the filter box body a7, the manual fire valve a8, the iodine adsorber a9, the manual fire valve b10, the manual isolation valve b11, the soft joint f39, the fan a12, the soft joint g40 and the check valve b13 which are sequentially connected through pipelines; the other end of the check valve a3 is connected with an exhaust port a1, and the other end of the check valve b13 is connected with an electric fire damper b14, a soft joint a34 and a chimney 41 in sequence.
The normal series, the safety series I and the safety series II are arranged in different rooms, and the safety series I and the safety series II are supplied with power by different power supply series, so that the safe and reliable operation of the system is guaranteed. One series of operations is sufficient to maintain the annular space at a negative pressure.
An air outlet a1 and an air outlet b2 are arranged in the annular space of the containment vessel, a check valve a3 for maintaining the stable operation of the system is arranged on the air outlet a1, and a check valve c15 for maintaining the stable operation of the system is arranged on the air outlet b 2.
Electric isolation valve a28 and electric isolation valve b29 can guarantee that radioactive gas can not leak to the environment through the shell under the accident condition in the annular space under the power failure and mechanical fault.
Manual isolation valve c17 and manual isolation valve d22 support electric heater b18, filter box b19, manual fire damper c20, iodine adsorber b21 and manual fire damper d22 in online service safety series.
Manual isolation valve a5 and manual isolation valve b11 support electric heater a6, filter housing a7, manual fire damper a8, iodine adsorber a9, and manual fire damper b10 in on-line service safety series two.
The blower a12 and the blower b24 are both provided with a 1E-level frequency converter to adjust the air volume of the blower, and the blower c32 is also provided with a non-1E-level frequency converter to adjust the air volume of the blower, so that the negative pressure of the annular space is ensured.
And fireproof cladding is adopted for the ventilating ducts passing through different fireproof subareas. The safety series is a series of air ducts connected between a check valve c15, a check valve c15, an electric fire valve c16, a fire valve d26 and a soft joint a34, and the safety series is a series of two air ducts connected between a check valve a3, a check valve a3, a movable fire valve a4, an electric fire valve 14 and a soft joint a34, all of which adopt fire-proof coatings, so that common mode failure is prevented, and reliable operation of the system is guaranteed.
The iodine adsorbers a9 and b21 are type III iodine adsorbers.
The invention also provides a ventilation method of the annular space ventilation system, which comprises the following steps:
step one, after a containment annular space tightness test is qualified, a normal series fan c32 frequency conversion mode is manually started in a main control room, and continuous operation is kept;
step two, when the radioactivity level of the annular space exceeds a certain threshold value, the normal series is isolated by closing the electric isolation valve a28 and the electric isolation valve b29, the normal series fan c32 is stopped, and the safety series second fan a12 is automatically started;
if the safe series two fails to start, the safe series one fan b24 is started emergently or protected to start after the radiation dosage high signal is delayed for 4 s;
and step four, if the automatic commands are invalid, directly and manually starting a safe serial second fan a12 or a safe serial first fan b24 power frequency operation mode in the master control room, and forbidding switching to a normal serial fan c32 power frequency operation mode.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (14)
1. An annular space ventilation system, comprising: the system comprises a normal series, a safety series I, a safety series II, an electric fire valve b (14), a check valve c (15), an electric fire valve c (16), an electric fire valve d (26), a soft joint a (34) and a chimney (41);
one end of the normal series is sequentially connected with an electric fire valve c (16), a check valve c (15) and an air outlet b (2), and the other end is sequentially connected with an electric fire valve d (26), a soft joint a (34) and a chimney (41); one end of the safety series is sequentially connected with an electric fire valve c (16), a check valve c (15) and an air outlet b (2), and the other end is sequentially connected with an electric fire valve d (26), a soft joint a (34) and a chimney (41); one end of the safety series II is connected with an air outlet a (1), and the other end is sequentially connected with an electric fire valve b (14), a soft joint a (34) and a chimney (41).
2. The annular space ventilation system of claim 1, wherein: the normal series comprises a manual balance valve (27), an electric isolation valve a (28), an electric isolation valve b (29), a filter box body c (30), a manual isolation valve e (31), a soft joint b (35), a fan c (32), a soft joint c (36) and a check valve e (33), the manual balance valve (27), the electric isolation valve a (28), the electric isolation valve b (29), the filter box body c (30), the manual isolation valve e (31), the soft joint b (35), the fan c (32), the soft joint c (36) and the check valve e (33) are connected sequentially through a pipeline, the electric fire valve c (16), the check valve c (15) and an air outlet b (2) are connected to the other end of the manual balance valve (27), the electric fire valve d (26) is connected to the other end of the check valve e (33), the soft joint a (34) and a chimney (41).
3. The annular space ventilation system of claim 2, wherein: the first safety series comprises a manual isolation valve c (17), an electric heater b (18), a filter box body b (19), a manual fire valve c (20), an iodine adsorber b (21), a manual fire valve d (22), a manual isolation valve d (23), a soft joint d (37), a fan b (24), a soft joint e (38) and a check valve d (25), wherein the manual isolation valve c (17), the electric heater b (18), the filter box body b (19), the manual fire valve c (20), the iodine adsorber b (21), the manual fire valve d (22), the manual isolation valve d (23), the soft joint d (37), the fan b (24), the soft joint e (38) and the check valve d (25) are sequentially connected through pipelines; the other end of the manual isolation valve c (17) is connected with an electric fire valve c (16), a check valve c (15) and an air outlet b (2), and the other end of the check valve d (25) is connected with an electric fire valve d (26), a soft joint a (34) and a chimney (41).
4. The annular space ventilation system of claim 3, wherein: the second safety series comprises a check valve a (3), a fire valve a (4), a manual isolation valve a (5), an electric heater a (6), a filter box body a (7), a manual fire valve a (8), an iodine adsorber a (9), a manual fire valve b (10), a manual isolation valve b (11), a soft joint f (39), a fan a (12), a soft joint g (40) and a check valve b (13), wherein the check valve a (3), the fire valve a (4), the manual isolation valve a (5), the electric heater a (6), the filter box body a (7), the manual fire valve a (8), the iodine adsorber a (9), the manual fire valve b (10), the manual isolation valve b (11), the soft joint f (39), the fan a (12), the soft joint g (40) and the check valve b (13) are sequentially connected through pipelines; the other end of the check valve a (3) is connected with the air outlet a (1), and the other end of the check valve b (13) is sequentially connected with the electric fireproof valve b (14), the soft joint a (34) and the chimney (41).
5. The annular space ventilation system of claim 4, wherein: the normal series, the safety series I and the safety series II are arranged in different rooms, and the safety series I and the safety series II are supplied with power by different power supply series.
6. The annular space ventilation system of claim 5, wherein: the electric isolation valve a (28) and the electric isolation valve b (29) can ensure that radioactive gas cannot leak to the environment through the shell under the working conditions of power failure and mechanical fault accidents of the annular space.
7. The annular space ventilation system of claim 6, wherein: and the fan a (12) and the fan b (24) are both provided with a 1E-level frequency converter to adjust the air volume of the fans.
8. The annular space ventilation system of claim 7, wherein: and the fan c (32) is provided with a non-1E-level frequency converter to adjust the air volume of the fan.
9. The annular space ventilation system of claim 8, wherein: the safety system comprises a check valve c (15), an annular space outer wall penetrating piece, a check valve c (15), an electric fire valve c (16), and a connecting air pipe between an electric fire valve d (26) and a soft joint a (34) which are coated in a fireproof mode.
10. The annular space ventilation system of claim 9, wherein: the safety series of the two stop return valves a (3), the check valve a (3) and the annular space outer wall penetration piece, the check valve a (3) and the electric fire-proof valve a (4) and the connecting air pipes between the electric fire-proof valve b (14) and the soft joint a (34) adopt fireproof coating.
11. The annular space ventilation system of claim 10, wherein: the iodine adsorber a (9) and the iodine adsorber b (21) are III-type iodine adsorbers.
12. The annular space ventilation system of claim 11, wherein: the manual isolation valve c (17) and the manual isolation valve d (23) support an electric heater b (18), a filter box body b (19), a manual fire valve c (20), an iodine adsorber b (21) and a manual fire valve d (22) in an online maintenance safety series.
13. The annular space ventilation system of claim 12, wherein: and the manual isolation valve a (5) and the manual isolation valve b (11) support an electric heater a (6), a filter box body a (7), a manual fire valve a (8), an iodine adsorber a (9) and a manual fire valve b (10) in the online maintenance safety series II.
14. A ventilation method of an annular space ventilation system as claimed in claim 13, wherein: the method comprises the following steps:
step one, after a containment annular space tightness test is qualified, a normal series fan c (32) frequency conversion mode is manually started in a main control room and keeps continuously running;
step two, when the radioactivity level of the annular space exceeds a certain threshold value, the normal series is isolated by closing the electric isolation valve a (28) and the electric isolation valve b (29), the normal series fan c (32) is stopped, and the safe series two fan a (12) is automatically started;
if the second safety series of fans fails to start, the second safety series of fans b (24) are started in an emergency or protected mode after being delayed for a plurality of seconds through the radiation dose high signal;
and step four, if the automatic commands are invalid, directly and manually starting a safe series two-fan a (12) or a safe series one-fan b (24) power frequency operation mode in the main control room, and forbidding switching to a normal series fan c (32) power frequency operation mode.
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