DD155364A2 - BIOLOGICAL PROTECTION FOR HERMETIC CABLE PROCESSING IN CORE POWER PLANTS - Google Patents

Abstract

The invention relates to a biological protection for hermetic cable bushings with electrical conductor arrangement and serves the further embodiment of the proposed biological protection WP 145438. The aim of the invention is to integrate electrical conductors on a biological protection, that minimal installation effort and free choice of installation locations for the implementation preserved. The task is to design the biological protection so that its protective effect is not impaired. According to the invention, insulated flexible conductors are routed through the central bore or externally through grooves or bores of the bi-protective body consisting of one piece or several disk-shaped pieces and, after emerging from the bore, are arranged around an additional protective body which is above and / or below the compact biofabrication body. Schutzkoerpers lies or an isolated rigid conductor is guided by o. G. center hole axially and has before or out of the hole a limited cross-sectional widening, which covers the opening of the compact bio-Schutzkoerpers.

Description

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Title of the invention

Biological protection for hermetic cable penetrations in nuclear power plants o

Field of application of the invention

The invention relates to a biological protection, in particular for hermetic cable bushings electrical measuring and supply lines through the containment of a nuclear reactor with already introduced into the containment shell of the reactor horizontally or vertically introduced internally unprocessed cable gland Yersatzrohren ·

Characteristic of the known technical solutions

To protect the operators and the environment, the nuclear reactors in nuclear power plants are surrounded by a containment envelope enclosing a hermetic area inside.

Hermetically sealed measuring and power cables lead from the non-hermetic area outside the hull into the hermetic area. »The ¹ safety hull has various functions to fulfill. During normal operation of the reactor, it must be the non-hermetic operator

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protect against radiation from the reactor, prevent destruction of the reactor in the event of external violence and, in the event of a reactor failure, withstand the temperatures and pressures occurring in the hermetic region. Furthermore, the numerous nucleides that occur in the event of an accident must not escape through the safety shell. " , The many hermetic cable glands passing through the containment shall not interfere with these punctures, and in particular shall not interrupt the biological protection of the containment. In order to achieve this, different routes will be labeled in nuclear power plants. For example, the installation sites for the bushings may be chosen so that the latter are not subjected to any radiation on the hermetic side, or they may lead to spaces on the non - hermetic side which are the Operating personnel may not be used »Often the protective effect of the soil is exploited by terminating the bushings in specially designed cable ducts, or the containment with the reactor is separated from the switchyard. (Literature: "Atom and power" Nov./Dec. 1967, 13o Jahrg., S- 202 ua) The disadvantage of such arrangements is that there are constraints on the installation locations of the bushings resulting in higher construction and assembly costs and lead longer cable paths

In the main patent (/ J / p ΛΨ £ ~ * f 3> ^

was already a biological, dh. Radiation-proof protection for hermetic cable bushings in reactor containment of nuclear power plants, arranged in the interior of a cable gland Versatzrohfes proposed, which is characterized in that located in the interior of the offset tube cylindrically shaped biosafety unit consists of at least two arranged in Rohrachsrichtung part-Bischutzkörpern that

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either overlap the gap surface or adapted to a tubular support device, wherein a compact organic protection body contains the firmly embedded cable or conductor and a ring in the axial direction of organic protection body on the entire circumference in the axial direction on the inner wall of the offset tube firmly abuts »

The present invention has in further, expedient embodiment of the biological protection according to patent

l / W ⁰ ΛH-S "4 - ^ <£ the assignment and assignment of isolated electrical conductors to the compact bio-protective body to the object, with a straightforward construction of the entire biosafety unit, a minimal installation effort on site and in particular the free choice of Fitting locations for.the bushings at any point in the containment and, above all, a demand-adequate protective effect at these installation locations remains o

Object of the invention

The inventive solution should make it possible to arrange insulated electrical conductors on or in a biological protection for hermetic cable bushings and to make this so that thereby minimal installation work on site and in particular the free choice of installation location for implementation at any point of the Reactor containment ^{1 is} maintained «

Explanation of the essence of the invention

The invention has for its object to make a biosafety unit, the isolated flexible or rigid electrical conductors on or assigned to make so that the biological protective effect of the containment of the reactor against ionizing radiation even at several, in relatively small distances in the containment

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arranged misleading pipes is not diminished in both perpendicular and oblique incident ionizing radiation.

According to the invention, this object is achieved in that the compact bioprotective body of BiO-protection unit contains at least one opening and consists of either one piece or several disc-shaped pieces ₀ through the opening is (are) the isolated (s) electrical ^) Head led. The opening of the compact bio-protection 'body is covered by at least one, additional organic protection body' Here is at least ein.isolierter predominantly flexible designed ladder through a center hole of the compact bioprotective body and before entering this center hole or after emerging from this Center bore led around a arranged in the axial direction additional organic protection body. It is also envisaged to guide the isolated predominantly flexible conductors externally on the compact organic protection body parallel or obliquely to the longitudinal axis arranged grooves or small holes and the grooves or small holes by a ring in the axial direction of organic protection body on the -innenwand of the cable feed-through offset pipe to WP / IM ^ Of t><S is firmly laid over ". The length of the compact bioprotective body 'is dimensioned so that it has at least the same protective effect as the safety envelope of the reactor, that the product of length IL and specific gravity Y ₄ * of the compact bioprotective body is greater than or equal to the product of strength s and specific gravity ψ of the material of the containment shell of the reactor is (I ₁ ^ ₁ £ s ο γ ) ₀

The same dimensioning principle applies to the length of the additional organic protection body which covers the radiation-permeable center bore of the compact organic protection body or for the length of the ring in the axial direction of organic protection body, the radiation-permeable grooves or small holes outside the compact organic protection -

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body covered. The realization of the necessary for the biological protection lengths of the organic protective body requires that materials are used for the bio-protective body with a much higher than the material of the reactor containment specific density, z. As lead, steel in a safety sheath made of concrete. The diameter of the additional bioprotective body is dimensioned so that an ionizing beam running obliquely to the axis through the center bore of the compact bioprotection body whose maximum angle is determined by the diameter of the center bore taking into account the conductors guided there, the additional bioprotective body penetrates in an equivalent in terms of protective effect of the reactor safety sheath »The radial extent of the ring-shaped in the axial direction bi-protective body is dimensioned so that obliquely to the axis of the grooves or small holes extending ionizing radiation whose maximum angle through the depth of the grooves or Diameter of the small holes are determined taking into account the guided there ladder, penetrate the ring in the axial direction of organic protection body in a protective effect of the reactor safety sheath corresponding length.Are in the containment of a reactor several Kabeldurchf arranged in small intervals, an obliquely to the axis of an offset tube extending ionizing beam cut two or more offset tubes «Especially in offset tubes arranged compact bio-protective bodies with compared to the safety envelope high specific gravity and thus smaller length I ^ consists of There is a risk that such an ionizing beam will be weakened to an insufficient degree by not penetrating the compact bio-protection bodies in two adjacent displacement tubes in the required length. To adequately attenuate such an ionizing beam is the diameter

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of the additional bioprotective body beyond that required to cover the center bore of the compact bioprotective body, and externally provided with grooves or small bores for guiding the insulated, predominantly flexible conductors. "In this solution, increased expenditure of material is required. In order to achieve a sufficient weakening of the ionizing beam with no increased cost of materials, the compact bio-protection body is divided into χ disk-shaped pieces of length I ^ ^f (1. = χ l ^ ¹ ), which are mechanically connected in a scaffold and kept at a distance are such that with the same mass, a better distribution of the compact organic protective body over the length of the displacement tube is effected _o the division of the compact organic protective body in a plurality of disc-shaped pieces and their distribution in offset tube carries furthermore advantageous to reduce the eddy current losses and thereby reducing The angle of an ionizing beam running obliquely to the axis of the central bore is smaller when dividing the compact bioprotective body into several disk-shaped pieces compared to the non-divided compact bioconductive body, so that the diameter of the zusätz biological protection body that covers the center hole can be reduced with the same protective effect. Conveniently, the division of the compact bioprotective body in several disc-shaped pieces continues to offer the possibility of structurally identical designed with hats or small holes provided disc-shaped pieces in the scaffold added, so that the * grooves or small holes are not in series and thus a sufficient weakening of the ionizing radiation already takes place in the compact bio-protective body. By dividing the additional bioprotective body into two parts of length Ip '

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(Io = 2 I ₂ ¹ ) and arrangement of de one part in the axial direction before and after the center bore provided with compact bio-protective body according to the same radiation considerations, a further reduction in the diameter of the split additional organic protection body possible »

In a further embodiment of the invention, the disk-shaped pieces of the split compact bio-protection body are not arranged in a rigid supporting structure, but v / ground enclosed by a manteiförmigen part whose radiation absorption capacity is greater than that of the containment of the reactor ₀ The disc-shaped pieces are preferably provided on one or both sides with centrally disposed against each other acting conical approaches and the voids between the disc-shaped pieces with granulated, pulverized o _e a ₀ materials of medium to high specific gravity, z _o B ₀ alumina, barite, filled »The compact formed in this way Organic protection body has an outside diameter which is smaller than the smallest diameter of the offset tube on the basis of permissible tolerances ". Mittels'mindestens a longitudinally guided by the compact organic protective body with tie rod screw is carried out an expansion and distortion of the compact organic protective body in the Ver-.satzrohro is particularly advantageous when high short-circuit stresses that the insulated electrical conductors through o _o a. Fillers mechanically supported *

According to the invention, the additional organic protective body covering the opening of the compact organic protective body can furthermore be formed by the electrical conductor itself. In this case, one or more insulated predominantly rigid conductors, which are guided through one or more bores in the compact bioprotection body, receive one before entry into the boreholes and / or after exit from the bores

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limited cross-sectional extension The dimensioning of length and diameter of the area of the cross-sectional enlargement are the same o _o a. Radiation Considerations β The area of enlarged cross-section is preferably formed of a separate piece, may be made of a material less. Conductivity exist and is with the continuous or divided, mainly rigidly shaped electrical conductor mechanically z. B * connected by brazing

In further. Embodiment of the invention is proposed to size the area enlarged conductor cross-section such that it replaces the compact organic protection body and its function takes _o Here is the area extended cross-section on a. Insulating scaffold arranged and additionally isolated against the arranged in the axial direction annular bio-protective body.

The subject invention is not limited to the passage of electrical conductors through the containment of a reactor, but also for other feedthroughs, Zo B. medium-carrying pipelines, applicable »

embodiment

The invention will be explained in more detail in the following exemplary embodiments. In the accompanying drawings:

1 shows the section through an arrangement of bio-protective bodies, wherein the compact bio-protective body has a central bore with insulated flexible conductors, which is covered by an additional organic protection body;

Figure 2: the section through an arrangement of bio-protection bodies, wherein the compact bi-Schutzkorper has on the outside longitudinal grooves with insulated flexible Leit.ern;

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FIG. 3: the plan view of a compact bio-protective body provided with longitudinal grooves, the insulated flexible conductor contains j

Pig. 4-: the section through an array of bioprotective bodies, the additional biochemical

Protection body greatly enlarged in diameter and provided externally with longitudinal groovesj

5 shows the section through an arrangement of organic protective bodies, wherein both the center hole provided with the compact organic protection body and the additional organic protection body are divided;

Fig. 6: the section through a divided into several disc-shaped pieces Kompakt.Bio protective body with an additional'manteiförmige η part;

FIG. 7C shows a section through an arrangement of bioprotective bodies, wherein an insulated rigid conductor with an area of enlarged conductor cross-section is guided through the center bore of the compact bioprotective body; FIG.

FIG. 8 shows the section through an insulated rigid conductor with an area of increased conductor cross-section, which is guided through the center bore of a compact bioprotective body divided into disc-shaped pieces; FIG.

FIG. 9C shows the section through an arrangement of biological

"Protective bodies, where the area of enlarged conductor cross-section replaces the compact bio-protective body"

In FIG. 1, the compact bioprotective body 1 has a center bore 2. To cover the center bore of the compact bioprotection body, an additional bioprotective body 3 is arranged in the axial direction, which is mechanically connected to the compact bioprotective body.

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The insulated, predominantly flexible conductors are routed through the center hole of the compact organic protection body and externally along the additional organic protection body. The compact Biο-protection body is connected to a support frame 5. The ring-shaped in the axial direction Bio-Schutzkörper .6 is fixed to the inner wall of embedded in concrete 7 grommet offset tube 8 and covers the remaining between outer wall of the compact organic protection body and inner wall of the offset tube due to tube tolerances gap according to patent

In Figo 2 and Fig. 3 has the compact organic protection body 1 along the axis grooves 9 · Insulated, mainly flexible conductors 4 are guided through the grooves of the "compact organic protection body and at its ends in the direction of the longitudinal axis." In the grooves between compact organic protection body and conductor remaining gaps are covered by the ring-shaped in the axial direction bio-protection body 6

In FIG. 4, the additional organic protection body 3 is enlarged in diameter beyond that required to cover the center bore 2 of the compact organic protection body. The additional organic protection body is arranged below the compact organic protection body and has grooves 9 along the axis. the isolated for recording o _o g. flexible conductor 4 serve ₀

In Fig. 5, the compact bioprotective body is divided into a plurality of center-hole-shaped disc-shaped pieces 1 ', which are mechanically connected via a support frame 5 and held at a distance c for covering

the center holes of the disk-shaped pieces are arranged on both end faces of the compact organic protection body in the axial direction depending on an additional bio-protective body 3 ^f , which is mechanically connected to the compact bio-protective body «

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The insulated flexible conductors 4 are guided through the center bore of the disc-shaped pieces and externally along the additional organic protection body

The compact bio-protection body in Figo 6 consists of spaced disc-shaped pieces 1 ^f , which are provided with conical projections 10 arranged on both sides and have a central bore 2 with insulated conductor 4. The fan-shaped part 11 encloses the disc-shaped pieces and forms cavities which are filled with granulated, powdered or above materials 12 of medium to high specific gravity. The arranged in the longitudinal direction in the compact organic protective body tie rods 13 with screw 14 serving the expanding and clamping the compact Bip_Schutzkörpers in offset tube _e By such a design of the compact bio-protection body located ggfo which A is unnecessary _n-order of the ring in the axial direction organic protective body O

The compact organic protective body in Figure "7 * contains a center hole 2 through which an insulated, predominantly rigid trained conductor 13 is guided" Above the compact organic protective body of o "g _e has insulated rigid circuit after exit from the central bore for a limited and the requirements corresponding cross-section svergroßerung 14 over a certain length, which served to cover the gap formed by the conductor insulation and installation tolerances

In FIG. 8, the o ₀ g exists. insulated rigid conductors 13 with the area enlarged conductor cross-section 14 of several parts, which are mechanically Z ₀ B. connected by soldering. The above-mentioned insulated rigid conductor is guided through the center bore 2 of the disc-shaped pieces 1 'divided compact organic protection body

In Fig. 9, the area of enlarged cross-section 14 is made of a material of lower electrical conductivity and Ί st; pv »nm <=> - f: r> -i Qf» Vi rl ο r> o wl- λ.ω <- + -.- ι 4- ~ + - j ~ d - j- ..

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represents compact biofighter and fulfills its function at the same time.

Between the compact bio-Schutzkorper and in the axial direction annular bio-protective body 6, an insulation 15 is arranged. The compact organic protection body rests on an insulating frame 16.

Claims (2)

-13 - 21915 claim 1. Biological protection for hermetic cable feedthroughs in reactor containment shells of nuclear power plants, which is arranged inside a Kabe! Execution offset tube and consists of a cylindrically shaped bio-protection unit with at least two arranged in Rohrachsrichtung part-bio-protective bodies, located either on the gap surface cover or are adapted to a tubular support device, wherein a compact Biο-protection body contains the firmly embedded cable or conductor and an axially annular bio-protection body on the entire circumference in the axial direction against the inner wall of the offset tube after Wp Λ tf, S ~ ΨΙ s »marked in that the compact bi-protective body is arranged with insulated conductors arranged so that one or more isolated, predominantly flexible electrical conductor through a central bore or outside by grooves or small holes of the one or more disc-shaped piece (s) existing compact BiO protective body is guided (are) and after exiting the bore laterally around an additional bioprotective body (is), which is located above and / or below the compact bioprotective body and is mechanically connected thereto or that an isolated, predominantly rigidly shaped electrical conductor through the center bore of the compact organic protection body, which consists of one or more disk-shaped piece (s), is axially guided and before entering or after exiting the bore has a limited in length and diameter enlargement and extension " -14- - 2 19 15 6 2. Biological protection according to item 1, characterized in that the provided with grooves or small holes disk-shaped pieces are arranged offset in a scaffold. 3, biological protection according to item 1, characterized in that the disc-shaped pieces of the compact bioprotective body are optionally provided on one or both sides with centrally arranged conical projections and enclosed by a Manteiförmiges part, wherein formed by the disc-shaped pieces with the jacket-shaped part Voids are filled with granulated, pulverized or "medium density or high specific gravity materials and at least one tension rod with" screwing in the longitudinal direction of the partitioned into compact disc-shaped bio-protective body is arranged ο Biological protection according to item 1, characterized in that the region of enlarged cross-section is formed of a separate piece and is mechanically connected to the continuous or divided, mainly rigidly shaped electrical conductor, 5 »biological protection according to item 1, characterized in that the predominantly rigidly formed insulated electrical conductor immediately below the annular bio-protection body has a cross-sectional widening and geometric design of a material of lower conductivity ι corresponding to the geometry of the compact organic protection body and on his Place is arranged. For this purpose /. ". Pages Zeidinungen