JP2012247066A - Heat insulation and heat retention method for piping installation in nuclear power plant - Google Patents
Heat insulation and heat retention method for piping installation in nuclear power plant Download PDFInfo
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- JP2012247066A JP2012247066A JP2012188584A JP2012188584A JP2012247066A JP 2012247066 A JP2012247066 A JP 2012247066A JP 2012188584 A JP2012188584 A JP 2012188584A JP 2012188584 A JP2012188584 A JP 2012188584A JP 2012247066 A JP2012247066 A JP 2012247066A
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- 238000009413 insulation Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000009434 installation Methods 0.000 title abstract 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 52
- 239000002184 metal Substances 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 229920001721 polyimide Polymers 0.000 claims abstract description 17
- 239000004642 Polyimide Substances 0.000 claims abstract description 16
- 239000006260 foam Substances 0.000 claims abstract description 16
- 230000001629 suppression Effects 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000012774 insulation material Substances 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 230000001771 impaired effect Effects 0.000 abstract description 2
- 230000008602 contraction Effects 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 description 20
- 239000011490 mineral wool Substances 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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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- Thermal Insulation (AREA)
Abstract
Description
本発明は、原子力発電プラントにおける配管設備、すなわち、原子炉やその機器等から延出する配管設備の断熱保温方法に関するものである。 The present invention relates to a heat insulation and heat retaining method for piping equipment in a nuclear power plant, that is, piping equipment extending from a nuclear reactor or its equipment.
従来、原子力発電プラントにおける配管設備、すなわち、原子炉から延出する配管や付設されている各種機器等から延出する配管設備の断熱保温には、保温材を金属被覆材としての金属ケース中に装填した金属被覆断熱保温材が使用されている。例えば、特許文献１には、金属製ケースの内部に多数の金属薄板が積層状に充填配置される金属反射型保温装置において、前記金属薄板に、格子状に型押しされたリブと、前記格子状リブで区画される面部分にあって、金属薄板間で異なる位相部位に前記リブより高く型押しされた突起とが設けられ、金属薄板は前記突起高さで規制される間隔をとって積層されていることを特徴とする金属反射型保温装置が開示されている。また、特許文献２には、断熱保温すべき配管や機器の外側に、軸方向および周方向に複数個に分割された保温体を配置し、かつ該保温体の周方向接合部の１つが配管の頂上部に位置するように配置し、前記接合部の周方向両側に変形防止用金属板を取り付けて成ることを特徴とする断熱保温装置が開示され、そして、その［００１３］段落には、上記保温体は２分割された半円筒形を成しており、金属薄板を層状に積層しケース状の金属板で覆ってなる金属被覆断熱保温材や、或いはロックウール等の繊維質保温材、シリカや珪酸カルシウム等の成形保温材を金属製ケースで被覆してなる金属被覆断熱保温材であることが開示されている。 Conventionally, in heat insulation of piping equipment in nuclear power plants, that is, piping extending from a nuclear reactor or various equipment attached thereto, a heat insulating material is placed in a metal case as a metal coating material. Loaded metal coated insulation is used. For example, in Patent Document 1, in a metal reflection type heat retaining device in which a large number of thin metal plates are filled and arranged inside a metal case, ribs embossed in a lattice shape on the thin metal plate, and the lattice And a protrusion that is embossed higher than the rib at a phase portion that is different between the thin metal plates, and the thin metal plate is stacked with an interval regulated by the height of the protrusion. A metal reflection type heat retaining device is disclosed. Further, in Patent Document 2, a heat insulating body divided into a plurality of parts in the axial direction and the circumferential direction is arranged outside a pipe and equipment to be insulated and heat-insulated, and one of the circumferential joints of the heat insulating body is a pipe. And a heat insulation and heat insulation device, characterized in that the heat insulation device is provided with a metal plate for preventing deformation on both sides in the circumferential direction of the joint, and the paragraph [0013] The above-mentioned heat insulating body has a semi-cylindrical shape divided into two, a metal-coated heat insulating heat insulating material in which metal thin plates are laminated in layers and covered with a case-shaped metal plate, or a fiber heat insulating material such as rock wool, It is disclosed that it is a metal-coated heat insulating heat insulating material formed by coating a heat insulating material such as silica or calcium silicate with a metal case.
上述の金属ケース中に装填される保温材のうち、金属薄板を積層してなる金属製保温材は、加工が難しく、また、費用も掛る。また、珪酸カルシウムからなる成形保温材は、珪酸カルシウムの加工が難しく、複雑な形状の配管設備に使用する金属ケースに精度良く適応させることは困難であった。 Of the heat insulating materials loaded in the metal case described above, a metal heat insulating material formed by laminating metal thin plates is difficult to process and costs high. In addition, the heat insulating material formed of calcium silicate is difficult to process calcium silicate, and it has been difficult to accurately apply it to a metal case used for piping equipment having a complicated shape.
そこで、従来、繊維質保温材であるロックウールが多用されている。ところで、原子力発電プラントは、配管破断による原子炉冷却材喪失事故［原子炉に繋がっている配管の破断等により原子炉内の冷却材（炉水）が流出する事象］時に、自動起動して原子炉に注水するための非常用炉心冷却系統を備えているが、この非常用炉心冷却系統では、水源であるサプレッションプールに異物が存在し、該非常用炉心冷却系統のポンプに吸い込まれてポンプに悪影響が生じるのを防ぐため、サプレッションプールの非常用炉心冷却系統の吸い込み口にストレーナ（金網）を設置している。そのため、配管が破断するときには、保温材として使用されているロックウールが破損して飛散し、時間の経過とともに、サプレッションプール中の水に混入し、非常用炉心冷却系統のストレーナの目詰まりの原因となる。そして、非常用炉心冷却系統のストレーナが目詰まりを起こすと、該非常用炉心冷却系統のポンプの吸水圧力が低下して該系統による原子炉への注水を停止させなければならない事態を生ずる。通常、非常用炉心冷却系統のストレーナを設置した吸い込み口は、サプレッションプール中の水位の中程に設置されており、該非常用炉心冷却系統のポンプの作動を停止することにより、非常用炉心冷却系統のストレーナに吸引されたロックウール等をサプレッションプールの底部に落下させ、それによって該非常用炉心冷却系統による原子炉への注水を再開させることができるという構成になっている。 Therefore, conventionally, rock wool, which is a fibrous heat insulating material, is frequently used. By the way, a nuclear power plant automatically starts up and reacts in the event of a loss of reactor coolant due to a pipe break [an event in which coolant (reactor water) flows out due to a pipe break connected to the reactor, etc.]. There is an emergency core cooling system for injecting water into the reactor. In this emergency core cooling system, foreign matter is present in the suppression pool, which is the water source, and is sucked into the pump of the emergency core cooling system. In order to prevent adverse effects, a strainer (wire mesh) is installed at the inlet of the emergency core cooling system of the suppression pool. Therefore, when the pipe breaks, the rock wool used as a heat insulating material breaks and scatters, and over time, it mixes into the water in the suppression pool, causing clogging of the strainer of the emergency core cooling system It becomes. When the strainer of the emergency core cooling system becomes clogged, the water absorption pressure of the pump of the emergency core cooling system is lowered, and there is a situation where water injection into the reactor by the system must be stopped. Usually, the suction port where the strainer of the emergency core cooling system is installed is installed in the middle of the water level in the suppression pool, and the emergency core cooling system is stopped by stopping the operation of the pump of the emergency core cooling system. Rock wool or the like sucked into the strainer of the system is dropped to the bottom of the suppression pool, and thereby water injection to the reactor by the emergency core cooling system can be resumed.
ところで、本発明は、既に保温材として知られている密度４〜１０ｋｇ／ｍ３のポリイミドフォームが、粉砕されて水中に投入されたときに直ちに浮遊し、長時間にわたって水中に混入することがないという知見に基づいてなされたものである。 By the way, in the present invention, a polyimide foam having a density of 4 to 10 kg / m 3 , which is already known as a heat insulating material, floats immediately when pulverized and put into water, and does not mix in water for a long time. It was made based on the knowledge.
本発明の目的は、水源であるサプレッションプールとこのサプレッションプールの水位の中程にストレーナを設置した吸い込み口を有する非常用炉心冷却系統を備えた原子力発電プラントにおける、配管破断による冷却材喪失事故時における非常用炉心冷却系統のポンプの作動時に、配管破断に伴う保温材の破壊屑等が非常用炉心冷却系統のストレーナが目詰まりを起して該非常用炉心冷却系統の吸い込み口を塞ぎ、非常用炉心冷却系統による原子炉への注水停止を必要とすることのない金属被覆断熱保温材を使用する原子力発電プラントにおける配管設備の断熱保温方法を提供することにある。 It is an object of the present invention to prevent a coolant loss accident due to a pipe break in a nuclear power plant including an emergency core cooling system having a suction pool with a strainer installed in the middle of the water level of the suppression pool as a water source and a strainer. When operating the pump of the emergency core cooling system, the waste material of the heat insulation material due to the pipe breakage clogged the strainer of the emergency core cooling system and blocked the suction port of the emergency core cooling system. An object of the present invention is to provide a heat insulation and heat insulation method for piping equipment in a nuclear power plant that uses a metal-coated heat insulation material that does not require stoppage of water injection into a nuclear reactor.
本発明の方法は、水源であるサプレッションプールとこのサプレッションの水位の中程にストレーナを設置した吸い込み口を有する非常用炉心冷却系統を備えた原子力発電プラントの配管設備の断熱保温方法において、密度４〜１０ｋｇ／ｍ３のポリイミドフォームが金属被覆材である金属製ケース中に圧縮装填された金属被覆断熱保温材を使用することを特徴とするものである。 The method of the present invention is a thermal insulation and heat insulation method for a piping facility of a nuclear power plant having an emergency core cooling system having a suction pool in which a strainer is installed in the middle of the water level of the suppression pool as a water source, and having a density of 4 It is characterized by using a metal-coated heat insulating heat insulating material that is compression loaded in a metal case in which a polyimide foam of 10 kg / m 3 is a metal coating material.
本発明の方法によれば、密度４〜１０ｋｇ／ｍ３のポリイミドフォームを保温材として装填した金属被覆断熱保温材を使用するので、配管破断による冷却材喪失事故時における非常用炉心冷却系統の作動時に、配管破断に伴い生ずる保温材の破壊屑等がサプレッションプールの水面に浮遊して水中に混入することがなく、したがって、サプレッションプールの水位の中程に設置された非常用炉心冷却系統のストレーナを目詰まりさせないので、非常用炉心冷却系統のポンプを停止させる必要がないという効果を奏するものである。 According to the method of the present invention, since the metal-coated heat insulating heat insulating material loaded with polyimide foam having a density of 4 to 10 kg / m 3 is used as the heat insulating material, the operation of the emergency core cooling system at the time of the coolant loss accident due to the pipe breakage Sometimes, heat-insulating material debris generated due to pipe breakage does not float on the water surface of the suppression pool and enter the water. As a result, it is not necessary to stop the pump of the emergency core cooling system.
また、金属被覆材としての金属ケース中に装填されるポリイミドフォームは、配管設備からの熱による収縮を考慮して圧縮装填されているので、長期にわたって断熱保温性能を損なうことがなく、原子力発電プラントの配管設備の金属被覆断熱保温材として好適に使用することができる。 In addition, the polyimide foam that is loaded into the metal case as the metal coating material is compressed and loaded in consideration of shrinkage due to heat from the piping equipment, so that the thermal insulation performance is not impaired over a long period of time. It can be suitably used as a metal-coated heat insulation material for piping equipment.
本発明の方法は、水源であるサプレッションプールとこのサプレッションプールの水位の中程にストレーナを設置した吸い込み口を有する非常用炉心冷却系統を備えた原子力発電プラントの配管設備に対する断熱保温のために、保温材として、密度４〜１０ｋｇ／ｍ３で比重が水よりも軽いポリイミドフォームが、金属製ボックスとその開口部に取り付けた金属製外装板からなる金属ケースに圧縮装填された金属被覆断熱保温材を使用するものである。 The method of the present invention is for heat insulation and insulation for piping facilities of a nuclear power plant having an emergency core cooling system having a suction pool with a strainer installed in the middle of the water level of the suppression pool as a water source. As a heat insulating material, a metal-coated heat insulating heat insulating material in which a polyimide foam having a density of 4 to 10 kg / m 3 and a specific gravity lighter than water is compression-loaded in a metal case made of a metal box and a metal outer plate attached to the opening thereof. Is to use.
ここで、ポリイミドフォームは、主成分がポリイミド樹脂から構成され、密度４〜１０ｋｇ／ｍ３、最高連続使用温度３００℃、熱伝導率０．０４６Ｗ／ｍＫを有するものである。 Here, the main component of the polyimide foam is a polyimide resin, and has a density of 4 to 10 kg / m 3 , a maximum continuous use temperature of 300 ° C., and a thermal conductivity of 0.046 W / mK.
原子力発電プラントの配管設備に金属被覆断熱保温材を施工するに際しては、ポリイミドフォームを予めブロック形状の成形体に作製し、この成形体から配管設備に応じて所定の寸法、形状に切断加工し、保温材として施工現場に搬入する。なお、ポリイミドフォームを切断加工するに際しては、施工後に受ける熱による収縮を考慮して所定寸法より若干大きくし、所定寸法の金属ケースに圧縮装填する。 When constructing a metal-coated heat insulation material for piping equipment of a nuclear power plant, a polyimide foam is prepared in advance into a block-shaped molded body, and the molded body is cut into a predetermined size and shape according to the piping equipment, Carry it into the construction site as a heat insulator. When cutting the polyimide foam, it is made slightly larger than a predetermined size in consideration of shrinkage due to heat received after construction, and is compressed and loaded into a metal case having a predetermined size.
なお、金属被覆材としての金属ケースは、その形状、構成等が特に限定されるものではなく、現在保温材としてロックウールが使用されている金属被覆断熱保温材における金属ケースと同様に構成し、その材料として同様のもの、例えば、ステンレス鋼板、アルミニウム板等を使用することができる。 In addition, the metal case as the metal coating material is not particularly limited in shape, configuration, etc., and is configured in the same manner as the metal case in the metal-coated heat insulation material that currently uses rock wool as a heat insulation material, The same material, for example, a stainless steel plate, an aluminum plate, etc. can be used.
ステンレス鋼板を用いて、内寸１００ｍｍ×５００ｍｍ×５００ｍｍのボックスを作製した。次に、ポリイミドフォーム（密度６ｋｇ／ｍ３）を１０５ｍｍ×５３０ｍｍ×５３０ｍｍの寸法、形状に切り出し、得られたポリイミドフォームをボックスの内部へ、ボックスの開口部から圧縮装填した。次に、ボックスの開口部へステンレス鋼板製の外装板をリベットにより取り付けることにより金属被覆断熱保温材を得た。この金属被覆断熱保温材を原子力発電プラントの配管設備に使用することにより、原子力発電プラントの配管設備を好適に断熱保温することができる。 Using a stainless steel plate, a box with an inner size of 100 mm × 500 mm × 500 mm was produced. Next, a polyimide foam (density 6 kg / m 3 ) was cut into a size and shape of 105 mm × 530 mm × 530 mm, and the obtained polyimide foam was compressed and loaded into the inside of the box from the opening of the box. Next, a metal-coated heat insulating heat insulating material was obtained by attaching a stainless steel outer plate to the opening of the box with rivets. By using this metal-coated heat insulation material for the piping equipment of a nuclear power plant, the piping equipment of the nuclear power plant can be suitably insulated and insulated.
上記実施例で使用した金属被覆断熱保温材中のポリイミドフォームは、水に混入することがないので、その粉砕物がサプレッションプールの水位の中程に設置された非常用炉心冷却系統のストレーナの目詰まりの原因となる恐れのないものである。 Since the polyimide foam in the metal-coated heat insulation material used in the above examples does not mix with water, the pulverized product is the strainer of the emergency core cooling system installed in the middle of the water level of the suppression pool. There is no risk of clogging.
なお、上記実施例においては、単に、金属被覆材としてのステンレス鋼板製のボックスにポリイミドフォームを圧縮装填し、その開口部に外装板を取り付けた金属被覆断熱保温材を示したが、本発明の方法で使用する金属被覆断熱保温材は、これを基本的形態として、配管設備すなわち直管、エルボ、ティ・バルブ等の形状、口径、曲げ角等に応じ、保温材の厚さや寸法、周囲の状況等を勘案して変形し、また、金属被覆断熱保温材を分割型とし、その分割数、形状等に応じて適宜変形し、それらを組み合わせて配管設備の金属被覆断熱保温材として使用できることは勿論である。 In the above-described embodiment, a metal-coated heat insulation material in which a polyimide foam is simply compression-loaded in a stainless steel plate box as a metal coating material and an exterior plate is attached to the opening is shown. The metal-insulated heat insulation material used in the method is based on this, and the thickness and dimensions of the heat insulation material and the surroundings are determined according to the shape, diameter, bending angle, etc. of piping equipment, that is, straight pipes, elbows, tee valves, etc. It can be deformed taking into account the situation, etc., and the metal-coated heat insulation and heat insulation material can be divided into parts, and can be appropriately modified according to the number of divisions, shape, etc. Of course.
本発明の方法によれば、金属被覆断熱保温材を原子力発電プラントの配管設備を断熱保温するための金属被覆断熱保温材として好適に使用できるばかりでなく、非常用炉心冷却系統ポンプの作動時に、配管破断に伴い発生する保温材の破壊屑等がサプレッションプールの水面に浮遊して水中に混入することがなく、非常用炉心冷却系統のストレーナの目詰まりを生じさせないので、非常用炉心冷却系統ポンプを停止させる必要がない。 According to the method of the present invention, not only can the metal-coated heat insulating heat insulating material be suitably used as a metal-coated heat insulating heat insulating material for heat insulating and heat-insulating piping facilities of a nuclear power plant, but also during operation of an emergency core cooling system pump, Insulation core cooling system pumps because the debris of the heat insulation material generated due to pipe breakage does not float on the water surface of the suppression pool and enter the water, and does not cause clogging of the strainer of the emergency core cooling system There is no need to stop.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2012188584A JP5450737B2 (en) | 2012-08-29 | 2012-08-29 | Thermal insulation and heat insulation method for piping equipment in nuclear power plants |
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| JP2012188584A JP5450737B2 (en) | 2012-08-29 | 2012-08-29 | Thermal insulation and heat insulation method for piping equipment in nuclear power plants |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2005222944A Division JP5132874B2 (en) | 2005-08-01 | 2005-08-01 | Metal-coated heat insulation |
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| JP2012247066A true JP2012247066A (en) | 2012-12-13 |
| JP5450737B2 JP5450737B2 (en) | 2014-03-26 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07174880A (en) * | 1993-12-20 | 1995-07-14 | Toshiba Corp | Reactor container and its reactor plant |
| JP2000035192A (en) * | 1998-07-22 | 2000-02-02 | Ask Corp | Heat insulating device |
| JP3375482B2 (en) * | 1996-03-13 | 2003-02-10 | ニチアス株式会社 | Metal reflective insulation |
| JP2004143378A (en) * | 2002-10-28 | 2004-05-20 | Ube Ind Ltd | Foamed polyimide structure and method for producing the same |
| JP2005153424A (en) * | 2003-11-28 | 2005-06-16 | Ube Ind Ltd | Foamed polyimide structure and its manufacturing method |
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2012
- 2012-08-29 JP JP2012188584A patent/JP5450737B2/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07174880A (en) * | 1993-12-20 | 1995-07-14 | Toshiba Corp | Reactor container and its reactor plant |
| JP3375482B2 (en) * | 1996-03-13 | 2003-02-10 | ニチアス株式会社 | Metal reflective insulation |
| JP2000035192A (en) * | 1998-07-22 | 2000-02-02 | Ask Corp | Heat insulating device |
| JP2004143378A (en) * | 2002-10-28 | 2004-05-20 | Ube Ind Ltd | Foamed polyimide structure and method for producing the same |
| JP2005153424A (en) * | 2003-11-28 | 2005-06-16 | Ube Ind Ltd | Foamed polyimide structure and its manufacturing method |
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| JP5450737B2 (en) | 2014-03-26 |
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