CA1304232C - Utilization system of heavy water heat in nuclear reactor - Google Patents
Utilization system of heavy water heat in nuclear reactorInfo
- Publication number
- CA1304232C CA1304232C CA000525463A CA525463A CA1304232C CA 1304232 C CA1304232 C CA 1304232C CA 000525463 A CA000525463 A CA 000525463A CA 525463 A CA525463 A CA 525463A CA 1304232 C CA1304232 C CA 1304232C
- Authority
- CA
- Canada
- Prior art keywords
- heavy water
- nuclear reactor
- heat
- boiling point
- cycle system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- 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
Landscapes
- Engine Equipment That Uses Special Cycles (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A utilization system of heavy water heat in a nuclear reactor includes a heavy water cooling system and a low temperature Rankine cycle system for heat recovering. The low temperature Rankine cycle system has an expansion machine for expanding a low boiling point medium to provide work, a condenser for cooling and condensing the low boiling point medium after expanded in the expansion machine as such, and a low boiling point medium circulation pump for circulating the low boiling point medium so condensed, whereby it receives heat from the heat exchanger of the heavy water cooling system for evaparating it. The heavy water cooling system further includes a refrigeration cycle system provided on the downstream side of said low temperature Rankine cycle system for cooling air in a pressure containment vessel of said nuclear reactor . The refrigeration cycle system is singly operated when the heavy water cooling system or the low temperature Rankine cycle system has any trouble.
A utilization system of heavy water heat in a nuclear reactor includes a heavy water cooling system and a low temperature Rankine cycle system for heat recovering. The low temperature Rankine cycle system has an expansion machine for expanding a low boiling point medium to provide work, a condenser for cooling and condensing the low boiling point medium after expanded in the expansion machine as such, and a low boiling point medium circulation pump for circulating the low boiling point medium so condensed, whereby it receives heat from the heat exchanger of the heavy water cooling system for evaparating it. The heavy water cooling system further includes a refrigeration cycle system provided on the downstream side of said low temperature Rankine cycle system for cooling air in a pressure containment vessel of said nuclear reactor . The refrigeration cycle system is singly operated when the heavy water cooling system or the low temperature Rankine cycle system has any trouble.
Description
~ 3~3~
The present invention relates to a system for effec-tively utilizing heavy water heat in a nuclear reactor employing the heavy water as a modulator.
The present invention will be illustrated by way of the accompanying drawings, in which -Fig. l is a system block diagram illustrating an embod-iment illustrating a heavy water cooling system in a nuclear reactor according to the pre~ent invention; and Fig. 2 is a system block diagram illustrating a prior heavy water cooling system ln a nuclear reactor.
A nuclear reactor wlth use of heavy water as a modera-tor has heavy water made high temperature due to thermal energy produced by neutrons being decelerated. Therefore, the heavy water is adapted to be circulated and cooled in a heavy water cooling system, e.g., the heavy water going out at ~rom 70C to 80C from th~ nuclear reactor is allowed to enter thereinto at about 50C.
Referring here to Fig. 2, a prior heavy water cooling system will be described.
A heavy water circulation pump 3 for circulatiny heavy water and a heat exchanger ~ are provided on a pipe line 2 dls-po~ed in the nuclear reactor 1 for circulating the heavy water.
The heavy water circulation pump 3 has main and auxiliary pumps for preventing the heavy water cooling system from being inter-rupted by opera~ing one pump therebetween even if the other is troubled. In addition, coolin~ water is fed to the he~t exchanger 4 via a plpe line 5 for cooling the heavy water.
However, the prior technique described above abandons heat of the heavy water wastefully. In partlcular, the heavy -- 1 ~
., , ~ ~g water is taken out at from 70C to 80C for heat exchan~e, and hence thermal energy involved in the waste heat is high to result in a large loss as the whole nuclear reactor installation ~rom the viewpoint of the heat balance thereof~
In view of the drawbacks of the p:rior techniques the present invention provides a system capable of effectively recov-ering heat given to heavy water and thereby providing work for improving the heat balance of the whole .nuc:Lear reactor installa-10 tion.
According to the present invention there is provided autilization system of heavy water heat in a nuclear reactor com-prising a heavy water cooling system for cooling heavy water from said nuclear reactor and again returning it to said nuclear reac-tor, and a low temperature Rankine cycle system provided on the downstream side of said heavy water cooling system for obtaining work from heat involved in the heavy water.
Thus, according to the present invention a utllization system of heavy water heat in a nuclear reactor provides a low temperature Rankine cycle system for recovering heat involved in the heavy water. The low temperature Rankine cycle system inc-ludes an expansion machine for expanding a low boiling tempera-ture medium to obtain work, a condenser for cooling the low temperature boiling point medium after the expansion thereof by the expansion machine and condensing it, and a low boiling point medium circulation pump for circulating the condensed low boiling point medium, and rec~ive heat from a heat exchan~er of the heavy water cooling system for evaporating the low boiling point med~umO
In one embodiment of the present invention the reactor further includes a refrigeration cycle system provided on the downstream side of said low temperature Rankine cycle system for cooling air ln a pressure containment vessel of said nuclear ~f ~'"'`
.._.
reactor.
In anoth~r embodiment of the present ~nvention said heavy water cooling system includes on a pipe line thereof two main and auxlliary heavy water clrculation pumps for circulating the heavy water, and a heat exchanger for cooling the heavy water from said nuclear reactor.
In a further embodiment of the present invention said lo low temperature Rankine cycle system includes on a pipe line thereof an expansion machine for expanding the low boiling point medium to provide the work, a condenser provided on the down-stream side of said expansion machine for condensing the low boiling point medium after expanded as such for thereby receiving the heat from the heavy water, and a low boiling point medium circulation pump provlded on the downstream side of said con-denser for circulating the low boiling point medium condensed as such, and said heat exchanger ~or coollng, preheating and evapo-rating the heavy water delivered from said low boiling point medium circulation pump.
In a still further embodiment o~ the present invention said re~riyeration cycle system includes on a pipe line thereof a compressor connected with said expansion machine of said low tem-perature Rankine cycle system and operated interloc~ing with theexpansion machine for compressing a medium in the refrigeration cycle system, a condensor provided on the downstream side of said compressor for cooling and condensing the medium so compressed with the aid of cooling part provided on the downstream side of said condenser for coollng alr in said pressure containment ves-sel through said cooling part by making use of the medium so cooled and condensed. Suitably the reactor further includes first clutch removable connectably provided between said expan-sion machine and said compressor, an electric motor, and second clutch removably connectably provided between said compressor and said electric motor, said compressor being disconnected from said ~ 31D~232 expansion machine and connected with said electric motor for singly operating said refrigeration cycle system when the heat of the heating water cannot be utilized as in the case where said nuclear reactor is i~terrupted or the output from said nuclear reactor is low.
An embodiment of a heavy water cooling system in a nuclear reactor of the present inventlon will be described with reference to Fig. 1.
A nuclear reactor 1 profitably employs heavy water as a moderator. The heavy water cooling system of the present inven-tion has a heavy water cooling system X for cooling the heavy water, a low temperature Rankine cycle system Y for obtaining work from heat of the heavy water, and a refrigeration cycle sys-tem Z for cooling air in a pressure corltain unit vessel 17 of the nuclear reactor.
The heavy water cooling system X includes on a pipe - 3a -~A7 ~
~ 3~4232 line 2 thereof two main and auxiliary heavy water circulation pumps 3 and a heat exchanger 4 for cooling heavy water, as are well known.
The low temperature Rankine cycle system Y, which receives heat from the heat exchanger 4 to provide work employs a low boillng temperature medium such as Fleon (trademark) as a medium thereof to thereby enable the heat to be effectively recovered even under -the heavy water temperature ranging from 70 to 80C. The low temperature Rankine cycle system ~ includes on a pipe line 6 thereof an expansion machine 7, a condenser ~, and a low boiling poin-t medium pump 9. The expansion machine 7 serves to expand the low boiling point medium for providing work.
The condenser 8 serves to cool the low boiling point medium after expanded as such for condensing it. The low boiling point medium circulation pump 9 serves to circulate the low boiling point medium condensed as such.
The heat exchanger 4 composed of a preheater 10 and an evaporator 11 forces on one side the heavy water to flow through the evaporator 11 and the preheater 10 in the order thereof and on the o-ther side forces the low boiling point medium supplied from the low boiling point medium circulation pump 9 of the low temperature Rankine cycle Y
to flow through the preheater 10 and the evaporator 11 in the order thereof for cooling the heavy water while preheating and evaporating the low boiling point medium.
The refrigeration cycle system Z includes on a pipe ~1 :3 0~23~
line 12 -thereof a compressor 13, a condenser 14, an expansion valve 15, and a cooling part 6. The compressor 13 is connected with the expansion machine 7 of the low tempera-ture Rankibne cycle system Y to opera~e interlocking with the expansion machine 7, for compressing the medium of the refrigeration cycle system Z. The condenser 14 serves to cool and condense the medium so compressed with the aid of cooling water, the expansion valve 15 serves to expand the low boiling point medium for the cooling part 16. The cooling part 16 serves to cool air in the pressure containment vessel 17. An electric motor 18 to actuate the compressor 13 is provided to permit the refrigeration cycle system Z to be singly operated even when the heavy water cooling system X or the low temperature Rankine cycle system Y has any trouble.
A clutch 19 is provided between the compressor 13 and the electrical motor 18 for removably connecting them with each other, while a clutch 20 is provided between the expansion machine 7 and the compressor 13 for removably connecting them with each other. Hereby, the compressor 13 is disconnected from the expansion machine 7 and connected with the electric motor 18 for singly operating the refrigeration cycle system Z when the heat of the heavy water can not be utilized as in the cases where the nuclear reactor 1 is interrupted or the output from the nuclear reactor 1 is low.
The present embodiment arranged as described above ~ 3~ L232 will be operated as follows:
In the heavy water cooling system ~, the heavy water from the nuclear reactor 1 allows the heat therof to be transferred in the heat exchanger 4 to the low boiling point medium of the low temperature Rankine cycle system Y, and -thus it is cooled and again returned to the nuclear reactor 1. In the low temperature Rankine cycle system Y, the low boiling point medium is evaporated by receiving heat from the heat exchanger 4 and expanded for providing work, and thereafter it is condensed in the condenser 8 and again returned to the heat exchanger 4 with the aid of the low boiling point medium circulation pump 9. In the refrigerator cycle sys-tem Z, the compressor 13, which interlocks with the expansion machine 7 of the low temperature Rankine cycle system Y compresses gaseous medium, which medium compressed as such is condensed in the condenser 14 for cooling air in the pressure containment vessel 17 through the cooling part 16.
Moreover, in the above embodiment the refrigeration cycle system was operated by making use of the work provided by the operation of the low temperature Rankine cycle system, but the present invention is not limited thereto, and it includes those driving a power generator Wit}l use of the low temperature Rankine cycle system.
Furthermore, the heat exchanger is not limited to those being clearly distinguished into the preheater and the evaporator, but it also includes a heat exchanger yielded 30~L23:~
by integrating them.
According to the present invention, as described above, effective work can be yielded by profitably employing the heat of heavy water from a nuclear reactor for improving the heat balance of all the nuclear reactor installation.
"!'; ,i~
,'`: :
The present invention relates to a system for effec-tively utilizing heavy water heat in a nuclear reactor employing the heavy water as a modulator.
The present invention will be illustrated by way of the accompanying drawings, in which -Fig. l is a system block diagram illustrating an embod-iment illustrating a heavy water cooling system in a nuclear reactor according to the pre~ent invention; and Fig. 2 is a system block diagram illustrating a prior heavy water cooling system ln a nuclear reactor.
A nuclear reactor wlth use of heavy water as a modera-tor has heavy water made high temperature due to thermal energy produced by neutrons being decelerated. Therefore, the heavy water is adapted to be circulated and cooled in a heavy water cooling system, e.g., the heavy water going out at ~rom 70C to 80C from th~ nuclear reactor is allowed to enter thereinto at about 50C.
Referring here to Fig. 2, a prior heavy water cooling system will be described.
A heavy water circulation pump 3 for circulatiny heavy water and a heat exchanger ~ are provided on a pipe line 2 dls-po~ed in the nuclear reactor 1 for circulating the heavy water.
The heavy water circulation pump 3 has main and auxiliary pumps for preventing the heavy water cooling system from being inter-rupted by opera~ing one pump therebetween even if the other is troubled. In addition, coolin~ water is fed to the he~t exchanger 4 via a plpe line 5 for cooling the heavy water.
However, the prior technique described above abandons heat of the heavy water wastefully. In partlcular, the heavy -- 1 ~
., , ~ ~g water is taken out at from 70C to 80C for heat exchan~e, and hence thermal energy involved in the waste heat is high to result in a large loss as the whole nuclear reactor installation ~rom the viewpoint of the heat balance thereof~
In view of the drawbacks of the p:rior techniques the present invention provides a system capable of effectively recov-ering heat given to heavy water and thereby providing work for improving the heat balance of the whole .nuc:Lear reactor installa-10 tion.
According to the present invention there is provided autilization system of heavy water heat in a nuclear reactor com-prising a heavy water cooling system for cooling heavy water from said nuclear reactor and again returning it to said nuclear reac-tor, and a low temperature Rankine cycle system provided on the downstream side of said heavy water cooling system for obtaining work from heat involved in the heavy water.
Thus, according to the present invention a utllization system of heavy water heat in a nuclear reactor provides a low temperature Rankine cycle system for recovering heat involved in the heavy water. The low temperature Rankine cycle system inc-ludes an expansion machine for expanding a low boiling tempera-ture medium to obtain work, a condenser for cooling the low temperature boiling point medium after the expansion thereof by the expansion machine and condensing it, and a low boiling point medium circulation pump for circulating the condensed low boiling point medium, and rec~ive heat from a heat exchan~er of the heavy water cooling system for evaporating the low boiling point med~umO
In one embodiment of the present invention the reactor further includes a refrigeration cycle system provided on the downstream side of said low temperature Rankine cycle system for cooling air ln a pressure containment vessel of said nuclear ~f ~'"'`
.._.
reactor.
In anoth~r embodiment of the present ~nvention said heavy water cooling system includes on a pipe line thereof two main and auxlliary heavy water clrculation pumps for circulating the heavy water, and a heat exchanger for cooling the heavy water from said nuclear reactor.
In a further embodiment of the present invention said lo low temperature Rankine cycle system includes on a pipe line thereof an expansion machine for expanding the low boiling point medium to provide the work, a condenser provided on the down-stream side of said expansion machine for condensing the low boiling point medium after expanded as such for thereby receiving the heat from the heavy water, and a low boiling point medium circulation pump provlded on the downstream side of said con-denser for circulating the low boiling point medium condensed as such, and said heat exchanger ~or coollng, preheating and evapo-rating the heavy water delivered from said low boiling point medium circulation pump.
In a still further embodiment o~ the present invention said re~riyeration cycle system includes on a pipe line thereof a compressor connected with said expansion machine of said low tem-perature Rankine cycle system and operated interloc~ing with theexpansion machine for compressing a medium in the refrigeration cycle system, a condensor provided on the downstream side of said compressor for cooling and condensing the medium so compressed with the aid of cooling part provided on the downstream side of said condenser for coollng alr in said pressure containment ves-sel through said cooling part by making use of the medium so cooled and condensed. Suitably the reactor further includes first clutch removable connectably provided between said expan-sion machine and said compressor, an electric motor, and second clutch removably connectably provided between said compressor and said electric motor, said compressor being disconnected from said ~ 31D~232 expansion machine and connected with said electric motor for singly operating said refrigeration cycle system when the heat of the heating water cannot be utilized as in the case where said nuclear reactor is i~terrupted or the output from said nuclear reactor is low.
An embodiment of a heavy water cooling system in a nuclear reactor of the present inventlon will be described with reference to Fig. 1.
A nuclear reactor 1 profitably employs heavy water as a moderator. The heavy water cooling system of the present inven-tion has a heavy water cooling system X for cooling the heavy water, a low temperature Rankine cycle system Y for obtaining work from heat of the heavy water, and a refrigeration cycle sys-tem Z for cooling air in a pressure corltain unit vessel 17 of the nuclear reactor.
The heavy water cooling system X includes on a pipe - 3a -~A7 ~
~ 3~4232 line 2 thereof two main and auxiliary heavy water circulation pumps 3 and a heat exchanger 4 for cooling heavy water, as are well known.
The low temperature Rankine cycle system Y, which receives heat from the heat exchanger 4 to provide work employs a low boillng temperature medium such as Fleon (trademark) as a medium thereof to thereby enable the heat to be effectively recovered even under -the heavy water temperature ranging from 70 to 80C. The low temperature Rankine cycle system ~ includes on a pipe line 6 thereof an expansion machine 7, a condenser ~, and a low boiling poin-t medium pump 9. The expansion machine 7 serves to expand the low boiling point medium for providing work.
The condenser 8 serves to cool the low boiling point medium after expanded as such for condensing it. The low boiling point medium circulation pump 9 serves to circulate the low boiling point medium condensed as such.
The heat exchanger 4 composed of a preheater 10 and an evaporator 11 forces on one side the heavy water to flow through the evaporator 11 and the preheater 10 in the order thereof and on the o-ther side forces the low boiling point medium supplied from the low boiling point medium circulation pump 9 of the low temperature Rankine cycle Y
to flow through the preheater 10 and the evaporator 11 in the order thereof for cooling the heavy water while preheating and evaporating the low boiling point medium.
The refrigeration cycle system Z includes on a pipe ~1 :3 0~23~
line 12 -thereof a compressor 13, a condenser 14, an expansion valve 15, and a cooling part 6. The compressor 13 is connected with the expansion machine 7 of the low tempera-ture Rankibne cycle system Y to opera~e interlocking with the expansion machine 7, for compressing the medium of the refrigeration cycle system Z. The condenser 14 serves to cool and condense the medium so compressed with the aid of cooling water, the expansion valve 15 serves to expand the low boiling point medium for the cooling part 16. The cooling part 16 serves to cool air in the pressure containment vessel 17. An electric motor 18 to actuate the compressor 13 is provided to permit the refrigeration cycle system Z to be singly operated even when the heavy water cooling system X or the low temperature Rankine cycle system Y has any trouble.
A clutch 19 is provided between the compressor 13 and the electrical motor 18 for removably connecting them with each other, while a clutch 20 is provided between the expansion machine 7 and the compressor 13 for removably connecting them with each other. Hereby, the compressor 13 is disconnected from the expansion machine 7 and connected with the electric motor 18 for singly operating the refrigeration cycle system Z when the heat of the heavy water can not be utilized as in the cases where the nuclear reactor 1 is interrupted or the output from the nuclear reactor 1 is low.
The present embodiment arranged as described above ~ 3~ L232 will be operated as follows:
In the heavy water cooling system ~, the heavy water from the nuclear reactor 1 allows the heat therof to be transferred in the heat exchanger 4 to the low boiling point medium of the low temperature Rankine cycle system Y, and -thus it is cooled and again returned to the nuclear reactor 1. In the low temperature Rankine cycle system Y, the low boiling point medium is evaporated by receiving heat from the heat exchanger 4 and expanded for providing work, and thereafter it is condensed in the condenser 8 and again returned to the heat exchanger 4 with the aid of the low boiling point medium circulation pump 9. In the refrigerator cycle sys-tem Z, the compressor 13, which interlocks with the expansion machine 7 of the low temperature Rankine cycle system Y compresses gaseous medium, which medium compressed as such is condensed in the condenser 14 for cooling air in the pressure containment vessel 17 through the cooling part 16.
Moreover, in the above embodiment the refrigeration cycle system was operated by making use of the work provided by the operation of the low temperature Rankine cycle system, but the present invention is not limited thereto, and it includes those driving a power generator Wit}l use of the low temperature Rankine cycle system.
Furthermore, the heat exchanger is not limited to those being clearly distinguished into the preheater and the evaporator, but it also includes a heat exchanger yielded 30~L23:~
by integrating them.
According to the present invention, as described above, effective work can be yielded by profitably employing the heat of heavy water from a nuclear reactor for improving the heat balance of all the nuclear reactor installation.
"!'; ,i~
,'`: :
Claims (6)
1. A utilization system of heavy water heat in a nuclear reactor comprising a heavy water cooling system for cool-ing heavy water from said nuclear reactor and again returning it to said nuclear reactor, and a low temperature Rankine cycle sys-tem provided on the downstream side of said heavy water cooling system for obtaining work from heat involved in the heavy water.
2. A utilization system of heavy water heat in a nuclear reactor according to claim 1, further including a refrig-eration cycle system provided on the downstream side of said low temperature Rankine cycle system for cooling air in a pressure containment vessel of said nuclear reactor.
3. A utilization system of heavy water heat in a nuclear reactor according to claim 1, wherein said heavy water cooling system includes on a pipe line thereof two main and aux-iliary heavy water circulation pumps for circulating the heavy water, and a heat exchanger for cooling the heavy water from said nuclear reactor.
4. A utilization system of heavy water heat in a nuclear reactor according to claim 1, wherein said low tempera-ture Rankine cycle system includes on a pipe line thereof an expansion machine for expanding the low boiling point medium to provide the work, a condenser provided on the downstream side of said expansion machine for condensing the low boiling point medium after expanded as such for thereby receiving the heat from the heavy water, and a low boiling point medium circulation pump provided on the downstream side of said condenser for circulating the low boiling point medium condensed as such, and said heat exchanger for cooling, preheating and evaporating the heavy water delivered from said low boiling point medium circulation pump.
5. A utilization system of heavy water in a nuclear reactor according to claim 2, wherein said refrigeration cycle system includes on a pipe line thereof a compressor connected with said expansion machine of said low temperature Rankine cycle system and operated interlocking with the expansion machine for compressing a medium in the refrigeration cycle system, a condenser provided on the downstream side of said compressor for cooling and condensing the medium so compressed with the aid of cooling part provided on the downstream side of said condenser for cooling air in said pressure containment vessel through said cooling part by making use of the medium so cooled and condensed.
6. A utilization system of heavy water heat in a nuclear reactor according to claim 4 further including first clutch removable connectably provided between said expansion machine and said compressor, an electric motor, and second clutch removably connectably provided between said compressor and said electric motor, said compressor being disconnected from said expansion machine and connected with said electric motor for singly operating said refrigeration cycle system when the heat of the heating water cannot be utilized as in the case where said nuclear reactor is interrupted or the output from said nuclear reactor is low.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP289372/85 | 1985-12-24 | ||
| JP60289372A JPS62148894A (en) | 1985-12-24 | 1985-12-24 | Heavy-water heat utilization system of nuclear reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1304232C true CA1304232C (en) | 1992-06-30 |
Family
ID=17742353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000525463A Expired - Lifetime CA1304232C (en) | 1985-12-24 | 1986-12-16 | Utilization system of heavy water heat in nuclear reactor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS62148894A (en) |
| CA (1) | CA1304232C (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5811896A (en) * | 1981-07-15 | 1983-01-22 | 株式会社東芝 | Medium temperature using power facility of atomic power plant |
-
1985
- 1985-12-24 JP JP60289372A patent/JPS62148894A/en active Pending
-
1986
- 1986-12-16 CA CA000525463A patent/CA1304232C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62148894A (en) | 1987-07-02 |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |