JP4822996B2 - Underground storage facility of waste geological disposal site and waste recovery method - Google Patents

Underground storage facility of waste geological disposal site and waste recovery method Download PDF

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JP4822996B2
JP4822996B2 JP2006252761A JP2006252761A JP4822996B2 JP 4822996 B2 JP4822996 B2 JP 4822996B2 JP 2006252761 A JP2006252761 A JP 2006252761A JP 2006252761 A JP2006252761 A JP 2006252761A JP 4822996 B2 JP4822996 B2 JP 4822996B2
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泰宏 須山
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本発明は、原子力発電から生じる放射性廃棄物等の地層処分場の地下に建設される地下貯蔵施設に関するものであり、将来の処分孔からの廃棄物の回収可能性を考慮したものである。 The present invention relates to an underground storage facility constructed in the basement of a geological disposal site for radioactive waste or the like generated from nuclear power generation, and considers the possibility of collecting waste from a future disposal hole .

原子力発電から生じる放射性廃棄物のうち高レベル放射性廃棄物は、使用済核燃料の再処理工程で分離された液体廃棄物であり、放射能レベルが高いばかりでなく、長期間にわたって放射能を持ち続ける長寿命の放射性核種が数多く含まれている。そのため、このような高レベル放射性廃棄物は、ガラス原料と共にステンレス鋼製のキャニスターに溶かし込みガラス固化体として安定化処理し、冷却のため数10年間貯蔵した後、ガラス固化体が収納されたキャニスターをオーバーパックと称される厚肉鋼板製の密閉容器内に密閉収納するなどして廃棄体とし、この廃棄体を地下300mより深い安定した地層中に埋設処分するようにしている。   Among the radioactive waste generated from nuclear power generation, high-level radioactive waste is liquid waste separated in the reprocessing process of spent nuclear fuel, and not only has a high level of radioactivity but also continues to have radioactivity for a long period of time. It contains many long-lived radionuclides. Therefore, such high-level radioactive waste is dissolved in a stainless steel canister together with glass raw materials, stabilized as a glass solidified body, stored for several decades for cooling, and then the canister in which the glass solidified body is stored. Is disposed in a sealed container made of thick steel plate called an overpack to form a waste body, and the waste body is buried in a stable formation deeper than 300 m underground.

この地層処分では、現在、地下深部にトンネル(処分坑道)を掘削し、廃棄体を埋設した後、その周囲(処分坑道内)をベントナイトなどで埋め戻すことにより埋設処分することが考えられている。この地層処分での安全性を示すためには、放射性廃棄物に含まれる核種が地下水に乗って人間が住んでいる世界に届かないように、岩盤自体の低透水性に期待すると共に、人間が掘削した処分坑道を確実に埋め戻し、核種の卓越した移行経路となる水みちを作らないことが要求されている。   In this geological disposal, it is currently considered to dig a tunnel (disposal tunnel) in the deep underground, bury the waste, and then backfill the surrounding area (within the disposal tunnel) with bentonite etc. . In order to demonstrate the safety of this geological disposal, we expect the low permeability of the bedrock itself so that the nuclides contained in the radioactive waste do not reach the world where people live on groundwater. There is a need to ensure that excavated disposal tunnels are backfilled and that there is no water channel that provides an excellent migration path for nuclides.

従来考えられている施設形状は、施工性、安全性、経済性の観点から、トンネルを同じ深度で並行に多数掘削し、一枚のパネルのような形状とするものである。図6、図7に示すように、高レベル放射性廃棄物の地層処分施設50は、地上施設51と地下施設52とから構成されている。地下施設52は、地上と地下を結ぶ立坑や斜坑等のアクセス坑道53、地下深部に複数並列して水平に掘削形成された処分坑道54、これら処分坑道に接続される主要坑道55等から構成されている。処分坑道54は区画されて独立した水平な処分パネルに分割されており、処分サイトの地質環境条件等に応じて、分散配置や多層配置等の柔軟なパネルレイアウトが可能とされ、また建設・操業・閉鎖の主要な作業を独立・並行して実施できるようにされている。   A conventionally considered facility shape is that a large number of tunnels are excavated in parallel at the same depth from the viewpoint of workability, safety, and economy to form a single panel. As shown in FIGS. 6 and 7, the high-level radioactive waste geological disposal facility 50 includes a ground facility 51 and an underground facility 52. The underground facility 52 includes an access tunnel 53 such as a vertical shaft or a tilt shaft connecting the ground and the underground, a disposal tunnel 54 formed by a plurality of horizontal drillings in parallel in the deep underground, and a main tunnel 55 connected to these disposal tunnels. ing. The disposal tunnel 54 is partitioned and divided into independent horizontal disposal panels, and flexible panel layouts such as distributed layout and multilayer layout are possible according to the geological environmental conditions of the disposal site, and construction and operation are also possible.・ Major closure work can be carried out independently and in parallel.

また、処分坑道54における廃棄体の定置方式には、種々の方式が考えられているが、例えば、図5(a)に示すような処分孔竪置き方式、図5(b)に示すような処分坑道横置き方式がある。図5(a)では、天然バリアとしての岩盤A中に掘削形成された処分坑道54の底盤部から下に向って処分孔56を鉛直に掘削形成し、トンネル軸方向には所定の間隔をおいて多数形成し、この処分孔56内に人工バリアとして地下水や岩盤圧の影響を低減する緩衝材(ベントナイト等) Bを敷き詰めると共に、この緩衝材B中に竪にした廃棄体Cを埋設定置している。処分坑道54は埋め戻される。図5(b)では、処分坑道54内に緩衝材Bを敷き詰めると共に、この緩衝材B中に横にした廃棄体Cをトンネル軸方向に所定の間隔をおいて埋設定置している。   In addition, various methods for placing waste in the disposal tunnel 54 are considered. For example, a disposal hole anchoring method as shown in FIG. 5A, as shown in FIG. There is a disposal tunnel horizontal installation method. In FIG. 5 (a), a disposal hole 56 is vertically drilled downward from the bottom of the disposal tunnel 54 formed in the rock A as a natural barrier, with a predetermined interval in the tunnel axis direction. In this disposal hole 56, buffer material (such as bentonite) B that reduces the influence of groundwater and rock pressure is laid as an artificial barrier, and the waste material C placed in the buffer material B is buried. ing. The disposal tunnel 54 is backfilled. In FIG. 5B, the buffer material B is spread in the disposal tunnel 54, and the waste C lying in the buffer material B is buried at a predetermined interval in the tunnel axis direction.

また、本発明に関連する先行技術文献として特許文献1〜8がある。特許文献1の発明は、一対の立坑と複数段の処分坑道と各処分坑道の多数の処分孔から構成される梯子型地下施設である。特許文献2の発明は、地上施設と中間施設の間、中間施設と処分坑道との間で、加減圧空気により気送台車を往復動させるものである。特許文献3の発明は、廃棄体と緩衝材とを処分孔や処分坑道に定置埋設する方法である。特許文献4の発明は、処分坑道を主要坑道から直角に分岐させて廃棄体を搬送定置するものである。特許文献5の発明は、空気搬送システムによる処分坑道等の建設方法および地層処分方法である。特許文献6の発明は、高レベル放射性廃棄物の処分坑道に定置するための定置構造である。特許文献7、8の発明は、放射性廃棄物を搬送用立坑や搬送用斜坑から収納用斜坑に特別な形状の緩衝体を介して交互に貯蔵処分するものである。   Further, there are Patent Documents 1 to 8 as prior art documents related to the present invention. The invention of Patent Document 1 is a ladder type underground facility composed of a pair of vertical shafts, a plurality of disposal tunnels, and a large number of disposal holes in each disposal tunnel. The invention of Patent Document 2 reciprocates an air carriage with pressurized air between a ground facility and an intermediate facility and between an intermediate facility and a disposal tunnel. The invention of Patent Document 3 is a method of embedding a waste body and a buffer material in a disposal hole or a disposal tunnel. In the invention of Patent Document 4, a disposal mine is branched from a main mine at a right angle to convey and place a waste body. The invention of Patent Document 5 is a construction method and a geological disposal method for disposal tunnels and the like using an air conveyance system. The invention of Patent Document 6 is a stationary structure for placing in a disposal tunnel for high-level radioactive waste. In the inventions of Patent Documents 7 and 8, radioactive waste is alternately stored and disposed from a transfer shaft or a transfer ramp to a storage ramp via a specially shaped buffer.

特開2005−331313号公報JP 2005-331313 A 特開2005−17048号公報JP 2005-17048 A 特開2004−286451号公報JP 2004-286451 A 特開2003−215297号公報JP 2003-215297 A 特開2003−148097号公報JP 2003-148097 A 特開2002−48900号公報JP 2002-48900 A 特開平11−223699号公報JP-A-11-223699 特開平11−153699号公報Japanese Patent Laid-Open No. 11-153699

地層処分とは放射性廃棄物を取り出す意図がないことを意味するが、高レベル放射性廃棄物の地層処分に係る安全規制の基本的考え方として、高レベル放射性廃棄物の地層処分場の閉鎖に際しては、建設段階・操業段階で得られたデータを追加し、安全評価の結果が妥当であることの確認を行い、またその妥当性を確認するまでの期間は、高レベル放射性廃棄物の回収の可能性を維持することが重要である、という考え方があり、廃棄物を取り出す可能性は除外することはできない。   Geological disposal means that there is no intention to extract radioactive waste, but as a basic concept of safety regulations related to geological disposal of high-level radioactive waste, when closing a geological disposal site for high-level radioactive waste, The data obtained at the construction and operation stages will be added to confirm that the safety assessment results are valid, and the possibility to recover high-level radioactive waste during the period until the validity is confirmed. There is a notion that it is important to maintain the risk, and the possibility of taking out the waste cannot be ruled out.

現在の処分施設の施設形態においては回収可能性を全く考えていないため、もし実施するとなると、多くの課題が残る。また、回収可能性をどの段階まで考慮するかで考え方も異なる。ここでは、現在考えられている閉鎖前段階(処分坑道は全て埋め戻し済み、立坑・連絡坑道・主要坑道は埋め戻し未実施)を対象とする(図4参照)。   Since the current disposal facility does not consider the possibility of collection at all, many problems remain if implemented. Also, the way of thinking is different depending on the stage to consider the recoverability. This covers the pre-closure stage currently considered (all disposal tunnels have been backfilled, and the shafts, connecting and main tunnels have not been backfilled) (see Fig. 4).

現在考えられている廃棄体の設置方法である処分孔竪置き方式と処分坑道横置き方式(図5参照)において、回収可能性を考えた場合、下記に示すような課題がある。   When considering the possibility of recovery in the disposal hole anchoring method and the disposal tunnel horizontal placement method (see FIG. 5), which are currently considered waste installation methods, there are the following problems.

(1)処分孔竪置き方式(図5(a)参照)
a)廃棄体を回収するためには、全ての処分坑道を再掘削する必要がある。
b)処分坑道の再掘削後、処分孔に埋め戻されている緩衝材を再掘削する必要がある。緩衝材は地下水の浸水により生じる膨潤などにより密実に埋め戻されているため、下から上への掘り起しは非常に困難である。特に廃棄体周りは、狭隘部となるため、更に困難となる。
c)処分孔から廃棄体を安全に引き上げる必要があるが、かなりの重量物であるため、安全上問題がある。
(1) Disposal hole storage system (see Fig. 5 (a))
a) In order to collect the waste, it is necessary to re-excavate all disposal tunnels.
b) After the excavation of the disposal tunnel, the buffer material backfilled in the disposal hole needs to be excavated again. Since the buffer material is densely backfilled by swelling caused by the inundation of groundwater, it is very difficult to dig up from the bottom to the top. In particular, the area around the waste body becomes a narrow portion, which is further difficult.
c) Although it is necessary to safely lift the waste from the disposal hole, there is a problem in safety because it is a heavy object.

(2)処分坑道横置き方式(図5(b)参照)
a)廃棄体を回収するためには、全ての処分坑道を再掘削する必要がある。
b)処分坑道のスペースが狭く、竪置き方式のように再掘削及び廃棄体運搬用の機器(大型機器)が入らない。
c)緩衝材の掘り出しが竪置き方式よりは容易であるが、やはりしづらい。
d)緩衝材の引き抜きが竪置き方式よりは容易であるが、やはりしづらい。
(2) Disposal tunnel horizontal installation method (see Fig. 5 (b))
a) In order to collect the waste, it is necessary to re-excavate all disposal tunnels.
b) The space of the disposal tunnel is narrow, and equipment for re-excavation and waste transportation (large equipment) does not enter like the dredging method.
c) Excavation of the buffer material is easier than the laying method, but it is also difficult to dig.
d) Although it is easier to pull out the cushioning material than the saddle placement method, it is also difficult to pull out.

本発明は、このような課題を解決すべくなされたもので、その目的は、高レベル放射性廃棄物等の地層処分場の地下貯蔵施設において、施設形態を変更することにより、処分孔からの廃棄体回収における施工性、廃棄体の回収の容易性、安全性、あるいは作業性などを大幅に向上させることができる廃棄物地層処分場の地下貯蔵施設及び廃棄物の回収方法を提供することにある。 The present invention has been made to solve such problems. The purpose of the present invention is to dispose of waste from the disposal hole by changing the facility form in the underground storage facility of the geological disposal site such as high-level radioactive waste. An object of the present invention is to provide an underground storage facility of a waste geological disposal site and a waste recovery method that can greatly improve the workability in body recovery, ease of recovery of waste, safety, or workability. .

本発明の一つは、廃棄物地層処分場の地下の地盤中に建設される廃棄体の回収効率を高めた地下貯蔵施設であり、地盤中に掘削形成された処分坑道内より水平に対して40°以下の傾斜角で傾斜して掘削形成される廃棄物を埋設定置するための処分孔が処分坑道長手方向に間隔をおいて複数個配置され、処分孔内に2個以上の廃棄体が緩衝材を介して埋設定置される処分孔方式の地下貯蔵施設であって
前記処分坑道は建設時に掘削形成される第1の処分坑道と建設時または廃棄物回収時に掘削形成される第2の処分坑道からなり、これらは一つ置きに間隔をおいて複数本並列させて配列されるものであって建設時又は廃棄物回収時には隣り合う前記第1の処分坑道と前記第2の処分坑道の処分坑道どうしがそれぞれ複数個の処分孔により連結され、かつ前記1本の処分坑道と隣り合う両側の2本の処分坑道との関係において、前記第1の処分坑道と前記第2の処分坑道のうちのいずれかの1本の処分坑道に対し、前記隣り合う両側の他の処分坑道との間で連結される2組のそれぞれ複数の処分孔の位置処分坑道長手方向に交互にずらして配置することにより、同時に2箇所の廃棄体の取出しも可能にしたことを特徴とする廃棄物地層処分場の地下貯蔵施設である。
One aspect of the present invention is an underground storage facility that enhances the recovery efficiency of waste bodies that are constructed in the underground ground of a waste geological disposal site, and is more horizontal than the disposal tunnel formed in the ground . A plurality of disposal holes are disposed in the disposal tunnel in the longitudinal direction of the disposal tunnel for placing the waste to be excavated at an inclination angle of 40 ° or less , and two or more waste bodies are disposed in the disposal hole. It is a disposal hole type underground storage facility that is buried via a cushioning material,
The disposal mine is composed of a first disposal mine excavated at the time of construction and a second disposal mine excavated at the time of construction or waste collection. These are arranged in parallel at intervals of every other one. a shall be arranged, the disposal gallery each other during construction or waste the recovery during the first disposal tunnel adjacent the second disposal tunnels are connected by a plurality of disposal holes respectively, and present the one In relation to the two disposal mine shafts on both sides adjacent to the disposal mine shaft, the one of the first disposal mine shaft and the second disposal mine shaft may be by staggered positions of two sets of a plurality of disposal holes that is coupled between the other disposal tunnel alternately disposal tunnel longitudinal direction, that it has a possible extraction of the waste in two places at the same time Characterized waste geological disposal It is an underground storage facility.

本発明は、特に高レベル放射性廃棄物の地層処分場の処分坑道に有効に適用されるものである。その他の廃棄物の地層処分にも適用することができる。本発明の処分坑道と処分孔との関係における基本形態は、例えば図1に示すように、1個あるいは2個以上の廃棄体が緩衝材を介して埋設定置される複数配列の処分孔を2つの処分坑道(大き目の空間)に連結するものである。処分孔は、後述する理由から、水平に対して少し傾斜させて掘削形成するのが好ましいが、水平、鉛直、傾斜なども本発明に含まれる。 The present invention is particularly effectively applied to a disposal mine in a geological disposal site for high-level radioactive waste. It can also be applied to geological disposal of other waste. The basic form in the relationship between the disposal mine and the disposal hole of the present invention is, for example, as shown in FIG. 1, two or more disposal holes in which one or two or more waste bodies are buried via a cushioning material. It is connected to one disposal tunnel (large space). The disposal hole is preferably formed by excavating with a slight inclination with respect to the horizontal for the reasons described later, but horizontal, vertical, and inclined are also included in the present invention.

処分孔を2つの処分坑道に連結させることにより、廃棄体を回収する際、片側の処分坑道のみを掘削すればよく、全ての処分坑道を掘削しなくても回収が可能となる。従来の処分孔竪置き方式と同様に大きめの空間の処分坑道から機械(大型機械)などにより処分孔内の再掘削、廃棄物の取り出し・運搬が可能となる。また、従来の処分孔竪置き方式に対して処分坑道の数が1本増えることになるが、繋いだ処分孔に埋設定置する廃棄体の数を従来の1個に対して2個にすれば、処分坑道の数は変わらず、さらに2個以上と多くすれば、全体として処分坑道自体の本数を減らすことができる。ここでは、廃棄体の数を2個以上に限定したものである。 By connecting the disposal holes to the two disposal tunnels, when collecting the waste, it is only necessary to excavate only one disposal tunnel, and the recovery can be performed without drilling all the disposal tunnels. As with the conventional disposal hole dredging method, it is possible to re-excavate the disposal hole and take out and transport the waste from the disposal tunnel of a large space by a machine (large machine). In addition, the number of disposal tunnels will increase by one compared to the conventional disposal hole anchoring system, but if the number of wastes to be buried in the connected disposal holes is two compared to the conventional one, The number of disposal tunnels does not change, and if the number of disposal tunnels is increased to two or more, the number of disposal tunnels can be reduced as a whole. Here, the number of waste bodies is limited to two or more .

処分孔を水平から少し傾斜させ、下側の処分坑道のみを掘削し、下側の処分坑道から緩衝材の掘り起こしを行えば、緩衝材の再掘削が従来のように上から行う場合よりも容易となる。同様に、下側の処分坑道から廃棄体の引き抜きを行えば、従来のように上から行う場合よりも、廃棄体の取り出しを容易に、かつ、安全に行うことができる。なお、上側の処分坑道のみを掘削し、上側の処分坑道から、緩衝材の再掘削と廃棄体の取り出しを行ってもよい。この場合でも、処分孔が水平に近ければ、容易に安全に行うことができる。   If the disposal hole is slightly inclined from the horizontal, only the lower disposal tunnel is excavated, and the buffer material is excavated from the lower disposal tunnel, re-excavation of the cushioning material is easier than when performing from above It becomes. Similarly, if the waste body is extracted from the lower disposal tunnel, the waste body can be taken out more easily and safely than in the conventional case. Alternatively, only the upper disposal tunnel may be excavated, and the buffer material may be re-excavated and the waste body may be removed from the upper disposal tunnel. Even in this case, if the disposal hole is nearly horizontal, it can be carried out easily and safely.

下側の処分坑道は、操業時には排水に用いることができる。その結果、処分孔はドライの状況で緩衝材の埋め戻しが可能となり、上側の処分坑道もドライの状況で埋め戻しが可能となる。また、処分坑道自体も排水を考慮し、水平に対して僅かながら勾配を設けるようにしてもよい。   The lower disposal mine can be used for drainage during operation. As a result, the disposal hole can be backfilled in a dry condition, and the upper disposal tunnel can be backfilled in a dry condition. Further, the disposal tunnel itself may be provided with a slight gradient with respect to the horizontal in consideration of drainage.

また、上記の地下貯蔵施設において、処分坑道は間隔をおいて複数本配列され、各処分坑道がそれぞれ複数個の処分孔により連結されている。 In the above underground storage facility, a plurality of disposal tunnels are arranged at intervals, and each disposal tunnel is connected by a plurality of disposal holes.

例えば、図2、図3に示すように、2本の処分坑道と複数配列の処分孔から構成されるパネルを処分孔長手方向に連続させる場合であり、1本の処分坑道に2組の処分孔が連結される。処分坑道の全体の本数を減らすことができ、また回収時に掘削する処分坑道の数を減らすことができると共に、同時に2箇所の廃棄体の取り出しが可能となる。図2のW字状に折曲させた形の場合(請求項に対応)は、一つ置きの下側の処分坑道のみの掘削で全ての廃棄体を回収でき、緩衝材・廃棄体の取り出しも下側へ行うことができ、緩衝材の除去・廃棄物の回収が容易となり、さらに操業時には上部からの廃棄体の定置・緩衝材の設置が簡易となる。図3のフラット形の場合は、一つ置きの処分坑道で廃棄体の引き抜きを上側と下側に行うことになる。 For example, as shown in FIG. 2 and FIG. 3, a panel composed of two disposal tunnels and a plurality of arrayed disposal holes is continuous in the longitudinal direction of the disposal holes. The holes are connected. The total number of disposal tunnels can be reduced, the number of disposal tunnels excavated at the time of recovery can be reduced, and two waste bodies can be taken out at the same time. In the case of the folded plate shape bent in the W shape of FIG. 2 (corresponding to claim 2 ), all waste bodies can be recovered by excavating only the lower disposal tunnel, and cushioning material / disposal The body can be taken out downward, the buffer material can be removed and the waste can be easily recovered, and the waste body can be easily placed and the buffer material can be installed from the top during operation. In the case of the flat shape shown in FIG. 3, the waste is pulled out on the upper side and the lower side in every other disposal tunnel.

また、上記の地下貯蔵施設において、1本の処分坑道に連結される2組の処分孔の位置は、処分坑道長手方向に互いにずらして配置されている。 In the above underground storage facility, the positions of the two sets of disposal holes connected to one disposal mine are shifted from each other in the longitudinal direction of the disposal mine.

図2、図3に示すように、1本の処分坑道に2組の処分孔を連結する場合、その位置を一致させずに、その位置を変える場合である。例えば、図示例のように、処分孔を互い違いに配列する。操業時に処分孔内に緩衝材を充填する際、処分孔の底部に蓋をするが、処分孔がずれて配置されていれば、処分坑道の底部で前記蓋の反力を取ることができる。   As shown in FIGS. 2 and 3, when two sets of disposal holes are connected to one disposal tunnel, the positions are changed without matching the positions. For example, as in the illustrated example, the disposal holes are arranged alternately. When the buffer material is filled in the disposal hole during operation, the bottom of the disposal hole is covered. If the disposal hole is displaced, the reaction force of the lid can be taken at the bottom of the disposal tunnel.

また、上記の地下貯蔵施設において、処分孔は水平に対して40°以下の傾斜角で傾斜している。 In the above underground storage facilities, disposal pits are you are inclined at an inclination angle of 40 ° or less with respect to the horizontal.

緩衝材・廃棄体の取り出し、排水などの面から、水平に対して少し傾斜させるのが好ましいが、急傾斜では廃棄体の取り出し時の安全性に問題が生じるため、40°以下とする。   It is preferable to slightly incline with respect to the horizontal in terms of taking out the buffer material / waste body, draining water, etc. However, a steep slope causes a problem in safety at the time of taking out the waste body.

本発明の他の一つは、上記の地下貯蔵施設の前記処分孔内に埋設された廃棄物を回収する方法であって、
建設時に、一端側が第1の処分坑道に連結された複数個の処分孔の他端側に第2の処分坑道を掘削形成して前記処分孔によりこれら処分坑道どうしを連結させ、廃棄物の埋設後、第1又は第2の処分坑道のいずれか一方を掘削し、掘削した処分坑道を利用して、処分孔内の緩衝材を掘削し、処分孔内の廃棄物を取り出すことを特徴とする廃棄物の回収方法である。
Another aspect of the present invention is a method for recovering waste embedded in the disposal hole of the above underground storage facility,
During construction, by connecting these disposal tunnel each other by the disposal pits one side is a second disposal tunnel excavated formed at the other end of the plurality of disposal holes connected to the first disposal tunnel, buried waste After that, either one of the first or second disposal tunnel is excavated, and the buffer material in the disposal hole is excavated using the excavated disposal tunnel, and the waste in the disposal hole is taken out. This is a waste collection method.

図1〜図3に示すように、予め第2の処分坑道を掘削形成しておくものであり、第1又は第2の処分坑道のいずれか一方を掘削して回収に使用することができる。   As shown in FIGS. 1 to 3, the second disposal mine is excavated and formed in advance, and either one of the first or second disposal mine can be excavated and used for recovery.

本発明の他の一つは、上記の地下貯蔵施設の前記処分孔内に埋設された廃棄物を回収する方法であって、
廃棄物回収時に、一端側が第1の処分坑道に連結された複数個の処分孔の他端側に新たに廃棄物を回収するための第2の処分坑道を掘削形成して前記処分孔によりこれら処分坑道どうしを連結させ、この掘削形成した第2の処分坑道を利用して、処分孔内の緩衝材を掘削し、処分孔内の廃棄物を取り出すことを特徴とする廃棄物の回収方法である。
Another aspect of the present invention is a method for recovering waste embedded in the disposal hole of the above underground storage facility,
During waste collection, one end thereof by the second the disposal pits disposal excavation formed by the for the recovery of new waste to the other end of the plurality of disposal holes connected to the first disposal tunnel A waste recovery method characterized in that the disposal tunnels are connected to each other , the buffer material in the disposal hole is excavated by using the second disposal tunnel formed by excavation, and the waste in the disposal hole is taken out. is there.

建設時には第2の処分坑道を掘削せずに、廃棄体回収時に新たに掘削する場合であり、この新たに掘削した処分坑道を回収に用いる。   In the construction, the second disposal mine is not excavated but newly excavated at the time of waste body collection, and this newly excavated disposal mine is used for recovery.

本発明は、以上のような構成からなるので、次のような効果が得られる。   Since the present invention is configured as described above, the following effects can be obtained.

(1)一端側が第1の処分坑道に連結された複数個の処分孔の他端側に第2の処分坑道を連結して構成されているため、従来の処分孔竪置き方式・処分坑道横置き方式の施設形態と比較し、廃棄体回収のための処分坑道の掘削土量を半分に減らすことが可能であり、工期短縮及びコスト低減を図ることができる。 (1) Since the second disposal tunnel is connected to the other end of the plurality of disposal holes, one end of which is connected to the first disposal tunnel, Compared with a facility type facility, the amount of excavated soil in the disposal tunnel for collecting waste can be reduced by half, and the construction period and cost can be reduced.

(2)従来の処分坑道横置き方式のように、大型機械が入らないという問題が無くなり、回収作業を効率よく行うことができる。 (2) The problem that large machines do not enter is eliminated as in the conventional disposal tunnel horizontal installation method, and the collection work can be performed efficiently.

(3)処分孔を水平から少し傾斜させ、下側の処分坑道から緩衝材の掘り起こしを行うことにより、従来の処分孔竪置き方式・処分坑道横置き方式と比較し、作業効率が向上する。 (3) Work efficiency is improved by tilting the disposal hole slightly from the horizontal and digging up the buffer material from the lower disposal tunnel, compared to the conventional disposal hole anchoring method and disposal tunnel horizontal placement method.

(4)処分孔を水平から少し傾斜させ、下側の処分坑道から廃棄体の引き抜きを行うことにより、従来の処分孔竪置き方式・処分坑道横置き方式と比較し、作業効率が向上すると共に、落下などの危険性が減り、作業の安全性が向上する。 (4) By tilting the disposal hole slightly from the horizontal and pulling out the waste from the lower disposal tunnel, work efficiency is improved compared to the conventional disposal hole anchoring / disposal tunnel horizontal installation method. The risk of falling, etc. is reduced and work safety is improved.

(5)処分孔を水平から傾斜させ、定置及び埋め戻しを上から行うことにより、緩衝材の充填も容易となり、作業能率の向上を図ることができる。 (5) By tilting the disposal hole from the horizontal and performing placement and backfilling from above, the buffer material can be easily filled and the work efficiency can be improved.

(6)下側の処分坑道で水を引き、水圧を下げることができるため、処分孔と上側の処分坑道はドライになり、施工がし易くなる。 (6) Since the water can be drawn in the lower disposal tunnel and the water pressure can be lowered, the disposal hole and the upper disposal tunnel become dry, making it easier to construct.

(7)上側・下側の処分坑道の掘削後、処分孔の掘削においては、下側の処分坑道も使用することができ、レイズ・ボーリング工法の適用も可能となる。 (7) After excavation of the upper and lower disposal tunnels, the lower disposal tunnel can be used for excavation of the disposal hole, and the raise boring method can be applied.

以下、本発明を図示する実施の形態に基づいて説明する。この実施形態は、高レベル放射性廃棄物の地下貯蔵施設に適用した例である。図1は、本発明に係る地下貯蔵施設の基本形態の一例を示す斜視図と鉛直断面図である。図2は、本発明に係る地下貯蔵施設の連続タイプの一例を示す斜視図と鉛直断面図である。図3は、本発明に係る地下貯蔵施設の連続タイプの他の例を示す斜視図と鉛直断面図である。   Hereinafter, the present invention will be described based on the illustrated embodiment. This embodiment is an example applied to an underground storage facility for high-level radioactive waste. FIG. 1 is a perspective view and a vertical sectional view showing an example of a basic form of an underground storage facility according to the present invention. FIG. 2 is a perspective view and a vertical sectional view showing an example of a continuous type of underground storage facility according to the present invention. FIG. 3 is a perspective view and a vertical sectional view showing another example of a continuous type underground storage facility according to the present invention.

図1の実施形態においては、第1の処分坑道1に処分坑道長手方向に間隔をおいて掘削形成された複数列の処分孔3に第2の処分坑道2を処分坑道1と平行に掘削形成し、並列配置の2本の処分坑道1、2を複数列の処分孔3で連結した梯子状の処分パネルとする。処分坑道1、2は、水平または水平に対して少し傾斜させて掘削形成し、処分坑道1と2の掘削深度を変えることにより、処分孔3を水平に対して少し傾斜させて掘削形成する。傾斜角θは、廃棄体取り出しの安全上、急傾斜は好ましくないので、40°以下とする。   In the embodiment of FIG. 1, a second disposal tunnel 2 is drilled in parallel to the disposal tunnel 1 in a plurality of rows of disposal holes 3 formed in the first disposal tunnel 1 at intervals in the longitudinal direction of the disposal tunnel. The two disposal tunnels 1 and 2 arranged in parallel are connected by a plurality of rows of disposal holes 3 to form a ladder-like disposal panel. The disposal tunnels 1 and 2 are excavated and formed with a slight inclination with respect to the horizontal or horizontal, and the disposal holes 3 are slightly inclined with respect to the horizontal by changing the excavation depth of the disposal tunnels 1 and 2. The inclination angle θ is set to 40 ° or less because a steep inclination is not preferable for safety of taking out the waste.

処分孔3内には、廃棄体(オーバーパック)Cが1個あるいは2個以上を処分孔長手方向に所定のピッチで水平または傾斜角θと同じ傾斜の横置き方式で配置され、空間部が埋め戻し材としての緩衝材(ベントナイト等) Bで埋め戻される。1個の処分孔3に廃棄体Cを1個埋設定置する場合は、処分坑道の数は、従来の処分孔竪置き方式の場合の2倍になるが、廃棄体Cを2個とすれば、処分坑道の数は変わらない。3個以上とすれば、全体として処分坑道の数を減らすことができる。   In the disposal hole 3, one or two or more waste bodies (overpacks) C are arranged in a horizontal manner at a predetermined pitch in the longitudinal direction of the disposal hole or at the same inclination as the inclination angle θ. Buffer material (such as bentonite) B as backfill material is backfilled. When one waste C is buried in one disposal hole 3, the number of disposal tunnels is twice that of the conventional disposal hole dredging method, but if there are two wastes C The number of disposal tunnels remains the same. If the number is three or more, the number of disposal tunnels can be reduced as a whole.

図2の実施形態は、図1の実施形態を処分坑道の直交方向に連続させた連続タイプで、W字状に折曲させた折板形である。水平面内において複数本の処分坑道を間隔をおいて平行に掘削形成し、隣接する処分坑道間を複数列の処分孔3で連結する。処分坑道の掘削深度を交互に変えることにより、上側の処分坑道1と下側の処分坑道2が交互に配置され、傾斜角θの処分孔3が傾斜方向を変えて配置される。この場合、上側の処分坑道1を緩衝材・廃棄体の搬入に使用し、下側の処分坑道2を廃棄体の回収に使用することができる。   The embodiment of FIG. 2 is a continuous plate in which the embodiment of FIG. 1 is continued in the orthogonal direction of the disposal tunnel, and is a folded plate shape bent into a W shape. A plurality of disposal tunnels are formed in parallel in the horizontal plane at intervals, and adjacent disposal tunnels are connected by a plurality of rows of disposal holes 3. By alternately changing the excavation depth of the disposal mine, the upper disposal mine 1 and the lower disposal mine 2 are alternately arranged, and the disposal holes 3 having the inclination angle θ are arranged by changing the inclination direction. In this case, the upper disposal tunnel 1 can be used for carrying in the buffer material / waste body, and the lower disposal tunnel 2 can be used for collecting the waste body.

図3の実施形態は、フラット形の連続タイプである。この場合、複数本の処分坑道を傾斜角θの平面内で間隔をおいて平行に掘削形成する。処分孔3は傾斜角θの平面内に配設される。この場合、一つ置きの処分坑道1を緩衝材・廃棄体の搬入に、処分坑道2を廃棄体の回収に使用することができる。   The embodiment of FIG. 3 is a flat continuous type. In this case, a plurality of disposal mine shafts are excavated and formed in parallel at intervals within a plane having an inclination angle θ. The disposal hole 3 is disposed in a plane having an inclination angle θ. In this case, every other disposal tunnel 1 can be used for carrying in buffer materials / waste bodies, and the disposal tunnel 2 can be used for collecting waste bodies.

図2、図3の実施形態において、1本の処分坑道1、2に連結される2組の処分孔3の位置は処分坑道長手方向に互いにずらして配置する。図示例は、隣接する処分孔3、3の中間に他の組の処分孔3が位置する互い違いの場合であるが、処分孔3の位置がずれていればよい。操業時に処分孔3内に緩衝材を充填する際、処分孔3の底部に蓋をする、あるいは少し緩衝材Bを埋め戻した後に蓋をするが、処分孔3がずれて配置されていれば、処分坑道1または2の底部で前記蓋の反力を取ることができる。 2, in the embodiment of FIG. 3, two sets of the position of the disposal pits 3 being connected to one of the disposal tunnel 1 and 2 you arranged offset from one another in the disposal tunnel longitudinal direction. Although the illustrated example is a staggered case in which another set of disposal holes 3 is located between the adjacent disposal holes 3 and 3, it is sufficient that the positions of the disposal holes 3 are shifted. When the buffer material is filled in the disposal hole 3 at the time of operation, the bottom of the disposal hole 3 is covered, or the buffer material B is backfilled a little, but if the disposal hole 3 is shifted and disposed The reaction force of the lid can be taken at the bottom of the disposal tunnel 1 or 2.

(A)廃棄体の回収時
図1において、下側の処分坑道2のみを掘削し、この処分坑道2に再掘削用・廃棄体運搬用の機械などを設置し、処分孔3内の緩衝材Bを掘削して取り出し、廃棄体Cを取り出す。廃棄体Cは処分坑道2内を運搬し、地上等に回収する。処分孔3は水平に対して少し傾斜し、下側の処分坑道2から取り出すため、緩衝材B・廃棄体Cを極めて容易に取り出すことができる。また、急傾斜でないため、廃棄体Cを安全に取り出すことができる。なお、上側の処分坑道1のみを掘削し、この上側の処分坑道1から緩衝材B・廃棄体Cの取り出しを行うこともできる。この場合でも、処分孔3は水平に対して緩やかに傾斜しているため、取り出しを容易に、かつ、安全に行うことができる。
(A) At the time of waste collection In FIG. 1, only the lower disposal tunnel 2 is excavated, and a machine for re-excavation / waste transport is installed in the disposal tunnel 2, and a buffer material in the disposal hole 3 B is excavated and taken out, and the waste body C is taken out. The waste C is transported in the disposal tunnel 2 and collected on the ground or the like. Since the disposal hole 3 is slightly inclined with respect to the horizontal and is taken out from the lower disposal tunnel 2, the buffer material B and the waste body C can be taken out very easily. Moreover, since it is not steeply inclined, the waste body C can be taken out safely. It is also possible to excavate only the upper disposal mine 1 and take out the buffer material B / waste body C from the upper disposal mine 1. Even in this case, since the disposal hole 3 is gently inclined with respect to the horizontal, it can be taken out easily and safely.

図2の場合も、下側の処分坑道2のみを掘削し、処分孔3内の緩衝材Bを掘削して取り出し、廃棄体Cを取り出す。この折板形の連続タイプの場合、処分坑道の全体の本数を減らすことができ、また回収時に掘削する処分坑道の数を減らすことができると共に、1本の処分坑道2で同時に2箇所の廃棄体Cの取り出しが可能となる。さらに、一つ置きの下側の処分坑道2のみの掘削で全ての廃棄体を回収でき、緩衝材・廃棄体の取り出しも下側へ行うことができ、緩衝材の除去・廃棄物の回収が容易となり、さらに操業時には上部からの廃棄体の定置・緩衝材の設置が簡易となる。   Also in the case of FIG. 2, only the lower disposal mine 2 is excavated, the buffer material B in the disposal hole 3 is excavated and taken out, and the waste body C is taken out. In the case of this folded plate type continuous type, the total number of disposal tunnels can be reduced, and the number of disposal tunnels excavated at the time of recovery can be reduced. The body C can be taken out. Furthermore, all wastes can be recovered by excavating only the lower disposal tunnel 2 at the lower side, and the buffer material / waste can be removed downward, so that the buffer material can be removed and the waste can be recovered. In addition, it becomes easier to place waste and install cushioning materials from the top during operation.

図3の場合は、一つ置きの処分坑道2のみを掘削し、処分孔3内の緩衝材Bを掘削して取り出し、廃棄体Cを取り出す。このフラット形の連続タイプの場合も、処分坑道の全体の本数を減らすことができ、また回収時に掘削する処分坑道の数を減らすことができると共に、1本の処分坑道2で同時に2箇所の廃棄体Cの取り出しが可能となる。なお、この場合、1本の処分坑道2に対して緩衝材・廃棄体の取り出しを上側と下側から行うことになる。   In the case of FIG. 3, only every other disposal tunnel 2 is excavated, the buffer material B in the disposal hole 3 is excavated and taken out, and the waste body C is taken out. Even in the case of this flat continuous type, the total number of disposal tunnels can be reduced, the number of disposal tunnels excavated at the time of recovery can be reduced, and two disposal tunnels can be discarded simultaneously in one disposal tunnel 2 The body C can be taken out. In this case, the buffer material / waste body is taken out from one disposal mine shaft 2 from above and below.

(B)操業時
図1において、操業は、上側の処分坑道1と下側の処分坑道2の掘削と、処分孔3の掘削が終了した時点で開始する。下側の処分坑道2で処分孔3の蓋をし、あるいは少し緩衝材Bを埋め戻した後、蓋をし、上側の処分坑道1から処分孔3内に緩衝材Bを充填し、廃棄体Cを埋設定置する。
(B) At the time of operation In FIG. 1, the operation is started when excavation of the upper disposal tunnel 1 and lower disposal tunnel 2 and the disposal hole 3 are completed. Cover the disposal hole 3 in the lower disposal tunnel 2 or backfill the buffer material B a little, and then cover it, and fill the disposal hole 3 from the upper disposal tunnel 1 with the buffer material B, C is buried.

下側の処分坑道2は、操業時には排水に用いる。その結果、処分孔3はドライの状況で緩衝材Bの埋め戻しが可能となる。また、上側の処分坑道1もドライの状況で埋め戻しが可能となる。下側で水を引き、水圧を下げるため、処分孔3と上側の処分坑道1はドライになり易い。   The lower disposal tunnel 2 is used for drainage during operation. As a result, the disposal hole 3 can be backfilled with the buffer material B in a dry state. Also, the upper disposal tunnel 1 can be backfilled in a dry state. Since water is drawn on the lower side and the water pressure is lowered, the disposal hole 3 and the upper disposal tunnel 1 are likely to be dry.

図2の場合は、一つ置きの上側の処分坑道1を使用して上記と同様に操業することができる。図3の場合は、処分坑道1、2を使用して上記と同様に操業することができる。ここで、1本の処分坑道に連結される2組の処分孔3の位置をずらして配置することにより、処分孔底部の蓋の反力を処分坑道の底部で取ることができる。   In the case of FIG. 2, it can operate similarly to the above using every other upper disposal mine 1. In the case of FIG. 3, the disposal tunnels 1 and 2 can be used in the same manner as described above. Here, the reaction force of the lid at the bottom of the disposal hole can be taken at the bottom of the disposal tunnel by disposing the two sets of the disposal holes 3 connected to one disposal tunnel.

(C)建設時(掘削時)
図1〜図3において、上側の処分坑道1と下側の処分坑道2の掘削後、処分孔3の掘削を行うが、この処分孔3の掘削では、下側の処分坑道2も使用することができるため、レイズ・ボーリング工法の適用も可能となる。
(C) During construction (drilling)
1 to 3, after excavation of the upper disposal tunnel 1 and the lower disposal tunnel 2, the disposal hole 3 is excavated. In the excavation of the disposal hole 3, the lower disposal tunnel 2 is also used. Therefore, it is possible to apply the raise boring method.

なお、以上は建設時(掘削時)に下側の処分坑道2を掘削する場合について説明したが、建設時に下側の処分坑道2を掘削せずに、廃棄体回収時に新たに掘削することもできる。この場合、新たに掘削した下側の処分坑道2を用いて緩衝材・廃棄体の引き抜きを行うことになる。   In addition, although the above demonstrated the case where the lower disposal mine 2 was excavated at the time of construction (at the time of excavation), without excavating the lower disposal mine 2 at the time of construction, it is also possible to newly excavate at the time of waste collection it can. In this case, the buffer material / waste body is extracted using the newly excavated lower disposal tunnel 2.

なお、以上は放射性廃棄物の地層処分場に適用した場合について説明したが、その他の廃棄物の地層処分にも適用することができる。   In addition, although the above demonstrated the case where it applied to the geological disposal site of radioactive waste, it is applicable also to the geological disposal of other waste.

本発明に係る地下貯蔵施設の基本形態の一例を示す(a)は斜視図、(b)は鉛直断面図である。(A) which shows an example of the basic form of the underground storage facility which concerns on this invention is a perspective view, (b) is a vertical sectional view. 本発明に係る地下貯蔵施設の連続タイプの一例を示す(a)、(b)は斜視図、(c)は鉛直断面図である。(A), (b) which shows an example of the continuous type of the underground storage facility which concerns on this invention is a perspective view, (c) is a vertical sectional view. 本発明に係る地下貯蔵施設の連続タイプの他の例を示す(a)は斜視図、(b)は鉛直断面図である。(A) which shows the other example of the continuous type of the underground storage facility which concerns on this invention is a perspective view, (b) is a vertical sectional view. 高レベル放射性廃棄物の地層処分を時系列で示す図である。It is a figure which shows the geological disposal of a high level radioactive waste in time series. 廃棄体の定置方法を断面にして示す斜視図であり、(a)は処分孔竪置き方式、(b)は処分坑道横置き方式である。It is a perspective view which makes the cross section the placement method of a waste body, (a) is a disposal hole dredging system, (b) is a disposal tunnel horizontal installation system. 高レベル放射性廃棄物の地層処分場の一例を示す断面による斜視図である。It is a perspective view by the section which shows an example of the geological disposal site of a high level radioactive waste. 従来の処分坑道による処分パネルを示す平面図である。It is a top view which shows the disposal panel by the conventional disposal tunnel.

符号の説明Explanation of symbols

1…処分坑道(第1・上側)
2…処分坑道(第2・下側)
3…処分孔
A…岩盤
B…緩衝材
C…廃棄体
1 ... Disposal tunnel (first and upper)
2. Disposal tunnel (second and lower side)
3 ... disposal hole A ... bedrock B ... cushioning material C ... waste

Claims (4)

廃棄物地層処分場の地下の地盤中に建設される廃棄体の回収効率を高めた地下貯蔵施設であり、地盤中に掘削形成された処分坑道内より水平に対して40°以下の傾斜角で傾斜して掘削形成される廃棄物を埋設定置するための処分孔が処分坑道長手方向に間隔をおいて複数個配置され、処分孔内に2個以上の廃棄体が緩衝材を介して埋設定置される処分孔方式の地下貯蔵施設であって
前記処分坑道は建設時に掘削形成される第1の処分坑道と建設時または廃棄物回収時に掘削形成される第2の処分坑道からなり、これらは一つ置きに間隔をおいて複数本並列させて配列されるものであって建設時又は廃棄物回収時には隣り合う前記第1の処分坑道と前記第2の処分坑道の処分坑道どうしがそれぞれ複数個の処分孔により連結され、かつ前記1本の処分坑道と隣り合う両側の2本の処分坑道との関係において、前記第1の処分坑道と前記第2の処分坑道のうちのいずれかの1本の処分坑道に対し、前記隣り合う両側の他の処分坑道との間で連結される2組のそれぞれ複数の処分孔の位置処分坑道長手方向に交互にずらして配置することにより、同時に2箇所の廃棄体の取出しも可能にしたことを特徴とする廃棄物地層処分場の地下貯蔵施設。
It is an underground storage facility that improves the collection efficiency of waste bodies built in the underground ground of the waste geological disposal site, and has an inclination angle of 40 ° or less with respect to the horizontal from the inside of the disposal tunnel formed in the ground. A plurality of disposal holes are disposed in the disposal tunnel in the longitudinal direction, and two or more waste bodies are embedded in the disposal hole via a buffer material. an underground storage facility of disposal hole scheme,
The disposal mine is composed of a first disposal mine excavated at the time of construction and a second disposal mine excavated at the time of construction or waste collection. These are arranged in parallel at intervals of every other one. a shall be arranged, the disposal gallery each other during construction or waste the recovery during the first disposal tunnel adjacent the second disposal tunnels are connected by a plurality of disposal holes respectively, and present the one In relation to the two disposal mine shafts on both sides adjacent to the disposal mine shaft, the one of the first disposal mine shaft and the second disposal mine shaft may be by staggered positions of two sets of a plurality of disposal holes that is coupled between the other disposal tunnel alternately disposal tunnel longitudinal direction, that it has a possible extraction of the waste in two places at the same time Characterized waste geological disposal Underground storage facilities.
請求項1記載の地下貯蔵施設において、前記第1の処分坑道と第2の処分坑道の複数本の処分坑道を一つ置きに間隔をおいて平行に掘削形成し、かつ前記第1の処分坑道と第2の処分坑道の掘削深度を交互に変えることにより、緩衝材・廃棄体の搬入が可能な上側の処分坑道と廃棄体の回収が可能な下側の処分坑道が交互に配置され、隣接する処分坑道間に前記複数処分孔が傾斜方向を変えて配置されるようにすることで、前記処分坑道と処分孔の配置をW字状に折曲させた折板形の配置としてあることを特徴とする廃棄物地層処分場の地下貯蔵施設。 In claim 1 the underground storage facilities, wherein the first and disposal galleries spaced every other disposal tunnel of the plurality of second disposal tunnel formed parallel to the excavation, and the first disposal tunnel By alternately changing the digging depth of the second disposal tunnel, the upper disposal tunnel that can carry in the buffer material and waste and the lower disposal tunnel that can collect the waste are alternately placed adjacent to each other. The plurality of disposal holes are arranged in different inclination directions between the disposal tunnels to be arranged, and the arrangement of the disposal tunnels and the disposal holes is arranged in a folded plate shape that is bent in a W shape. Characterized underground storage facility for waste geological disposal site. 請求項1または2記載の地下貯蔵施設の前記処分孔内に埋設された廃棄物を回収する方法であって、
建設時に、一端側が第1の処分坑道に連結された複数個の処分孔の他端側に第2の処分坑道を掘削形成して前記処分孔によりこれら処分坑道どうしを連結させ、廃棄物の埋設後、第1又は第2の処分坑道のいずれか一方を掘削し、掘削した処分坑道を利用して、処分孔内の緩衝材を掘削し、処分孔内の廃棄物を取り出すことを特徴とする廃棄物の回収方法。
A method for recovering waste embedded in the disposal hole of the underground storage facility according to claim 1 or 2 ,
During construction, by connecting these disposal tunnel each other by the disposal pits one side is a second disposal tunnel excavated formed at the other end of the plurality of disposal holes connected to the first disposal tunnel, buried waste After that, either one of the first or second disposal tunnel is excavated, and the buffer material in the disposal hole is excavated using the excavated disposal tunnel, and the waste in the disposal hole is taken out. Waste collection method.
請求項1または2記載の地下貯蔵施設の前記処分孔内に埋設された廃棄物を回収する方法であって、
廃棄物回収時に、一端側が第1の処分坑道に連結された複数個の処分孔の他端側に新たに廃棄物を回収するための第2の処分坑道を掘削形成して前記処分孔によりこれら処分坑道どうしを連結させ、この掘削形成した第2の処分坑道を利用して、処分孔内の緩衝材を掘削し、処分孔内の廃棄物を取り出すことを特徴とする廃棄物の回収方法。
A method for recovering waste embedded in the disposal hole of the underground storage facility according to claim 1 or 2 ,
During waste collection, one end thereof by the second the disposal pits disposal excavation formed by the for the recovery of new waste to the other end of the plurality of disposal holes connected to the first disposal tunnel A method for collecting waste, characterized in that the disposal tunnels are connected to each other , the buffer material in the disposal hole is excavated by using the second disposal tunnel formed by excavation, and the waste in the disposal hole is taken out.
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