DE102005043857A1 - Device for arrangement of boiling water nuclear reactor fuel rods has number of grouped reception tubes adaptable to requirements welded into head and foot plates and sealed by silver coated metal seals - Google Patents

Abstract

A device for arrangement of boiling water nuclear reactor fuel rods comprises a boiler with a number of grouped reception tubes adaptable to requirements welded into head and foot plates and sealed by silver coated metal seals. An independent claim is included for arranging the fuel rods and boiler.

Description

The present invention dealing with the problem of storing used or damaged fuel rods or control rods (is the same: absorber rods) of boiling water reactors. For this purpose, the invention provides a quiver with a number adapted to the requirements number of combined into a bundle receiving tubes which are welded in a top plate and a foot plate, wherein the sealing effected by silver-coated metal seals water pockets in the sealing area are avoided.

The draw fuel rod quiver invention characterized by the fact that they are very compact, being at a distance held washers the receiving tubes of the tube bundle in Keep distance. The head area is solid and rigid, which Loads from handling in the pool and during transport in cheaper Be removed manner.

The Demand for a gas tightness over a storage period of 40 years is characterized by the compact and rigid construction of the head and seals ensured by constructive measures in the Area of seals both inside and outside is avoided that water pockets remain, their water over Dissociation can lead to corrosion in the sealing area.

Thereby that the fuel quiver according to the invention in the outside positions the storage container the following advantages arise: Because of the low temperature in the outer position results in a significantly lower internal pressure in the fuel rod quiver, which Less stress on the long-term seals and structural parts leads, which in turn means a lighter construction and several storage positions in the fuel rod quiver allows. Furthermore, the fuel rod quiver acts with its lower activity inventory and larger stainless steel mass as a shield to the wall of the storage container.

For drying the fuel rod quiver a drying plant is provided, wherein procedurally normally the fuel rod quivers dried to the extent that residual water remains in columns of fuel rods, what if heated by evaporation leads to pressure buildup in the fuel rod quiver. In a demand for lower residual moisture in the fuel rod quiver can be a drying system over a longer evacuation time be used. Here is a complete recording of the measured values and the aggregate states of Drying system and their backup and documentation provided.

The Quivers of the invention can be customized to the requirements of the operator by number and diameter adapted to the receiving tubes become. Each fuel rod is receivable, either in capsules or in pods plugged in or free. The use of interim sleeves for Recording of fuel rod breaks Immediately at the fuel element repair avoids a repeated Contamination of the pool water when loading into the fuel rod quiver. As soon as a fuel rod quiver to disposal can stand on the interim sleeve can be omitted and the fuel rod breakage can be directly into appropriate Pick-up tubes are adjusted.

The Handling with and at the interim sleeves, the fuel rods and the capsules and the components of the head of the fuel rod quiver takes place with simple bar tools. The required clamping forces for the seals and the stopper of the transport head of the fuel rod holder become torque-secured applied.

Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings. In the drawing show the 1 to 9 Details of inventively designed fuel rod holes.

1 Needs assessment

Höfer & Bechtel carried out a search in 2004 with the SWR operators for the faulty fuel rods (BS) to be stored. The question was the number, BE type, degree of damage, type of up to herigen storage and special features. Furthermore, an estimate was made of the number and degree of damage to the defective BS to be expected up to the end of the term of the BWR plants and the values were agreed with the operators.

Out today's point of view results after evaluation of us present Data a need from 8 to 9 BS-Köchern of our concept, whereby the demand of all German SWR systems is extrapolated up to the end of their term were. The evaluation of the search is set out in Annexes 10100-106-M-BE001-KKI, -BE004-KKB, To find -BE005-KGG, -BE006-KKK, BE007-KKP1.

2 Service with the operators

Of the Transport and insertion of the BS quiver in the BE warehouse and the Warehouse positions are agreed with the respective operators. When Handling and packaging position, we have provided the KAM. Here can from the old quiver or be invited directly into the BS quiver at BE repair.

All Handling with interim sleeves or open capsules take place in the KAM.

The Transport facilities at the operators are with BE hooks to Inserting the BS quiver into the storage basin and with BE-Greifer of the BWB for the transport of until completely filled BS-quiver established.

The parking space for the drying plant is located near the KAM, the length of the hose between BS quiver and drying plant is about 10 meters. All the tools necessary to package the BS box, including the interim sleeve tool, are kept in a pool. During the work on the BS quivers, they are suspended at the KAM stage. In addition going necessary tools are charged directly with the operators.

The Packing the BS quivers done according to effort. We see two employees for this Work ahead. Depending on the scope of work (interface not yet clear) and accessibility Let's sit for three to five days with the supervision effort for reviewers / approval authorities, etc. z. Not yet estimated can be.

3 Description and proof

3.1 Structure of the BS-quiver

The BS quiver is comparable to a fuel element with its dimensions, masses and handling requirements. It consists of a foot with foot plate, a tube bundle with washers and handrails and a head with top plate, protective plate, sealing plate with valve and transport head; further a drying head for drying the interior of the BS quiver.
comp. 1 and 2

Of the Foot corresponds in the load handling area the foot of a BE; he fits in the foot pictures of the Storage racks, the KAM and the shafts of storage containers. Of the Foot is with the foot plate screwed.

The Handrails are with the foot plate bolted, pick up the washers and hold them up Distance. The handrails are bolted to the head plate.

The tube bundle consists of the receiving tubes for the defective BS to be stored. The pickup tubes are at the bottom Over End plug tightly welded. At the upper end of the receiving tubes in the mounting holes of Top plate tightly welded. Support the washers the receiving tubes over the whole length analogous to the spacers in the BE from. About the end plugs are the receiving tubes with the foot plate welded (see appendix drawing 10100-106 / 03-1000).

At handover BS-cooker in the storage container is the sealing plate with the integrated valve on the top plate screwed. Sealing plate and valve have inlaid Helicoflex metal seals analogous to the seals in the CASTORS. Transfer the screw connections the required sealing forces. Ultimately, the transport head is screwed to the sealing plate; he simultaneously secures the valve. The bracket of the transport head corresponds the headband a BE and can thus with the existing handling / transport facilities be recorded.

For the introduction BS-cooker in the storage basin as well as for the interim time until loading and drying of the BS quiver becomes the transport head screwed directly onto the top plate.

At the Loading the intake tubes of the BS quiver with BS, interim sleeves, capsules etc., the head plate is freely accessible. The sealing area is covered with the protective plate.

at the drying of the interior of the BS quiver is the sealing plate on the top plate screwed on and gem. braced the required sealing forces; the valve is open. The drying head is placed on the sealing plate, the screw nose is inserted in the valve and the drying head is bolted to the sealing plate. To the Drying head is a shut-off valve and connected to it by a hose leads to the drying plant, which stands on the pelvic floor. After completion of drying is with a rod tool, close the valve and with the required Sealing force clamped.

3.2. features

Planning until production, exams

• • Of the BS-quiver Fulfills all requirements that have been specified in the VPU.
• • The Method of sealing was qualified
• • The Tightness was confirmed by the manufacturer
• • The intended materials were used
• • The Design specifications to avoid water residues were complied with
• • The Pressure test with control over dye penetrant was carried out
• • The KTA acceptance of BS-quiver at manufacturer was completed

Introduction into the storage pool, Transport in the basin

• • Of the Transport head of the BS quiver corresponds to the headband a BE. It can be grasped with BE-hooks and with the BE-gripper of the BWB become.
• • Of the Foot of the BS-quiver corresponds to the foot of a BE in the landing area. He can be in everyone Stock item and special item sold.
• • The box size of the BS box of 150 × 150 mm ^{2 also} fits in the storage and special positions.

Loading the BE-quiver

• • The Loading the BE-quiver with BS sleeves or capsules in the KAM as well as the loading of the previous one quiver
• • Around to secure the loaded fuel inventory from shifting (maintenance the fuel assembly even after an accident), spacers are in the Pick-up height used the clearance between inventory and sealing plate to 2 mm.

Drying, he-filling, sealing

• • The Placing and screwing the sealing head is done acc. the approved one Procedure test.
• • The Drying can over the known volumes of the BS quiver be driven exactly to the default point (from documentation of the Loading).
• • To HE filling the sealing screw of the valve acc. the approved procedure test.

bring in the storage container

• • Of the Foot of the BS-quiver fits in the foot the storage container; it corresponds to the foot of a BE in the landing area.
• • All other dimensions BS-cooker are smaller than the manhole dimensions with which the BS quiver is set.

3.3 conditions of use, Design, manufacture, materials

transport container

• • Of the BS-quiver is set in an edge position of the storage containers.
• • at the storage container CASTOR V / 52 is the average temperature in an edge position 215 ° C
• • The delay for the 9 meter case for CASTOR V / 52: Impact on the generatrix 110g Impact on the bottom / lid side 90g

• • Der Transportkopf wird nach KTA 3905-4.3 eingestuft.
• • Die lastabtragenden Komponenten Dichtplatte, Kopfplatte, Haltestangen, Fußplatte und Fuß werden nach KTA 3902/3903-4.3 eingestuft. Die Dichtbereiche sind davon ausgenommen.

For handling and transport of the BS quivers in the intermediate storage location of the operator, the design according to KTA applies.

• • The transport head is classified according to KTA 3905-4.3.
• • The load-bearing components sealing plate, top plate, handrails, base plate and foot are classified in accordance with KTA 3902 / 3903-4.3. The sealing areas are excluded from this.

• • Werkstoffauswahl/-Belegung als EG1 Teil analog zu KSD 4060/50, Werkzeuge BE-Handhabung
• • Konstruktion, Berechnung, Fertigung und Fertigungsüberwachung nach TRV 006, Klassifizierungsstufe 1
• • Darüber hinaus erfolgt eine Demonstration der Aufbringung der Dichtkraft bei Dichtplatte/Kopfplatte und Ventil/Dichtplatte in einer Verfahrensprüfung sowie eine Demonstration der Leistung der Trockenanlage in einer Verfahrensprüfung
• • Für jeden BS-Köcher wird – eine Kalte Druckprobe (äquivalent dem Druckaufbau bei 215°C) mit anschließender Farbeindringprüfung – Helium-Lecktest mit einer Leckrate ≤ 10^–7 Pa m³/s beim Hersteller durchgeführt.
• • Eine Dichtheitsprüfung nach Verschluss der Verpackung im Lagerbecken entfällt; die Verfahrensprüfungen werden belastet.

For the conditions in the storage container to which the BS quiver is subject, the following conditions apply to the components: take-up height, top plate, sealing plate, valve and metal gasket:

• • Material selection / allocation as EG1 part analogous to KSD 4060/50, tools BE handling
• • Design, calculation, production and production monitoring according to TRV 006, classification level 1
• • In addition, a demonstration of the application of sealing force on the faceplate / top plate and valve / seal plate in a process test as well as a demonstration of the performance of the drier in a process test
• • For each BS quiver becomes - a cold pressure test (equivalent to pressure build-up at 215 ° C) with subsequent dye penetration test - helium leak test with a leak rate ≤ 10 ^-7 Pa m ³ / s carried out by the manufacturer.
• • There is no leak test after closing the packaging in the storage tank; the procedural checks will be charged.

3.4. inventory

Geometric data BS quiver length chest measurement 150 × 150 [mm ² ] washers 150 × 150 × 10 [mm ³ ], 7 pieces, spacing 508 to 541 [mm] Handrails 16⌀ [mm], 4 pieces Tube bundles from tubes 23 x 1.5; 19 × 1.5; 16 × 1.5; 14 × 1.5 [A × s, mm]

Masses of BS quivers

3.5 Proof of subcriticality

According to ADR, part 7, CV 33, we assume that BE and BS are the same are; they will have to decay accordingly before being placed in storage containers become. A comparison BE with BS quiver on plausibility analysis is legitimate.

Farther is based on all our considerations that the BS quiver in an edge position of the storage container stands. The reasons therefor are the lower temperature in the edge position versus more central Positions, which is reflected in a lower internal pressure in the BS quiver and thus leads to lower loads on the BS quiver.

The lower fuel inventory of the BS quivers compared to a BE and the higher stainless steel content the BS quiver loads the outer zones of the storage container less than one BE and shield the radiation of the inner BE Outside down.

Out 3.4 "Inventory" with the different BS quivers occupied by BS This results in a maximum of 50% of a BE inventory being used in a BS quiver can be. Because cooldown / burn on BE and BS should be the same should BS quiver be more subcritical than BE.

An "Oriented criticality calculation for SWR fuel rod quivers" for BS quivers with 19 to 39 tuned BS shows that, under conservative assumptions, the reactivity k _∞ always remains ≤ 0.9 If one reduces the conservatism of the assumptions, then k _eff Range of ≤ 0.7.

By the tight enclosure the BS in the receiving tubes and by the use of spacers for Reduction of axial play in the receiving tubes as well as by Sufficient design of the structural parts becomes the fuel inventory even after an accident held in position. The considerations of subcriticality remain thus valid.

3.6 Heat observation

As already at 3.5 "proof subcriticality "is mentioned the BS quiver set in an edge position of the storage container. As shown in 1. "Needs Assessment" will be from the BS-quivers recorded between 23 and 39 BS. The fuel mass per BS quiver is at max. 50% of a BE, the heat content with it as well.

Of the heat input in the storage position through the BS quiver is by this amount as well lower. The heat dissipation BS-cooker is cheaper at the lower level as the heat dissipation a BE. When creating the VPU, a consideration to the radial heat dissipation be provided.

3.7 Dose rate at the surface

The spent BE are gem. ADR, Part 7, CV 33. The BS quivers are subject as well as this set of rules. This compares BE with BS quivers. For the dose rate on the surface are the outer BS determining as well as the total number of BS. For the BE 8 × 8, 9 × 9 to 10 × 10 are 28 to 36. Foreign positions occupied, at the BS-quivers are a maximum of 21 external positions occupied. The total number of BS in the BS quivers is only half as big as at the BE. The dose rate is thus below the dose rate of one BE. The specified fuel zones are complied with in the BS quivers. Furthermore, all BS through the surrounding receiving tubes shielded.

A Offsetting source strength Self-shielding can be provided during VPU creation.

3.8 Retention of radioactive substances

The Radioactive inventory of BS quivers is enclosed on all sides metallically tight. The pick-up tubes with welded End plugs are welded into the top plate. The top plate is going through the sealing plate with valve over four M 16 screws and a silver-coated metal gasket (Garlock HELICOFLEX TYPE HNV 200 with 3.6mm cord thickness - outer sheath silver) sealed; the valve is also over a silver-coated metal gasket (Helicoflex) and M 60 against the Sealing plate sealed.

The required high contact forces are on the 4 screws M 16 or over M 60 × 4 applied with sufficient reserve torque-secured; all Seals are pulled on block. The pressure build-up in the BS quiver Evaporation of the residual water in the columns of the BS at storage temperature 215 ° C is also with reserves through the structural parts and the intended sealing system ablated.

The retention of radioactive material over a period of 40 years is ensured by the exclusive use of stainless steel for the pressure containment combined with that for The CASTORS proven silver-plated metal seal aging and corrosion are covered. Nevertheless, all groove portions of the seals are provided with slots to the inside and outside to prevent whereabouts of residual water in water pockets.

The for the accident During transport specified loads from delays are caused by the compact Design of the BS quiver covered with sufficient reserve.

Calculated For evidence, see 4. Skill Calculation

3.9 Incident considerations

In the location intermediate storage is during transport and handling of BS-quiver Care must be taken to ensure that there is no danger of an activity release the result of radiation exposure in the vicinity of the nuclear power plant can occur. Here cover the regulations of KTA 3905.-4.3, 3902 / 3903-4.3 these concerns. An accident analysis not necessary.

For the conditions in the storage container during transport and storage for the BS quiver shows that it can be assumed that the load from internal pressure / temperature with the load off delay in the 9 meter case can come together in time and therefore superimposed must become. A rollover bill is in Section 4 Design documents under strength calculation to find.

At the accident the seals are not loaded. By the set in the storage container BS-quiver is the internal pressure in the storage container not impaired. It becomes a BS quiver in a storage container set.

Assuming the leaking of a BS-cooker, the filling volume of the BS-cooker of a maximum of 15 dm ^{3 can come} with the filling volume of the storage container of several cubic meters in pressure compensation.

4 construction documents

Attached is one Assembly drawing with details of the components used. It become exclusive stainless steels or stainless steels used. All loaded components are considered EG 1 parts.

In The VPU will be a workshop drawing with all relevant production Specifications, will be a material list with procurement information and a test sequence plan with production, testing and acceptance information. Structure of the VPU analogous to KTA 3905-4.3.

The attached Strength calculation shows all loads in a rollover and load case combinations of our BS-quiver, shows the calculation approach and shows the calculated stresses and required forces / moments out; the reserves are called.

In the calculations are detailed in the VPU. FEM analysis will be included in the calculation if necessary.

• Siehe Anhang „Festigkeitsberechnung Gasdichter Brennstabköcher für SWR"
• Siehe Anhang „Zeichnung 10100-106/03-1000"

A consideration of the pressure build-up in the BS quiver by evaporation of the residual water in the BS is included in the calculation, as well as an overlay pressure build-up / deceleration in the 9 meter case.

• See appendix "Strength calculation Gas-tight fuel rod quiver for SWR"
• See appendix "Drawing 10100-106 / 03-1000"

5 handling documents

The attached Description is a rough version of handling for filling / packaging the BS quiver. In the VPU we described the handling in detail and through added a flowchart, in the working and test steps are listed with reference to corresponding specifications for these Working and testing steps. Structure of the VPU analogous to KTA 3905-4.3

5.1 Use of the BS-Köchers ins Fuel pool

The BS quiver is inserted with the BE hook into the BE storage basin and parked in a storage position or a special position. This mounting condition corresponds to the delivery condition. The BS quiver is mounted as follows: A protective plate is placed on the top plate, which covers the sealing area of the top plate, thus protecting it against damage when loading the BS quiver. On it sits the transport head, which is bolted to the head plate. The screw connection was carried out torque limited.
comp. 3

1

5.2 Loading the BS quiver

To the The BS quiver is loaded set in the KAM. Thereafter, the transport head with a bar tool dismantled and salvaged. The protective plate remains on the top plate until the completion of the loading. The loading is also carried out with Bar tool and collet depending on the object to be stored like BS, interim sleeve or capsule according to given Loading plan.

After completing the loading of the parts to be disposed of, the distance between the top edge of the insert and the top edge of the top plate is measured for each receiving tube; then appropriate spacers are cut and inserted with rod tool / collet into the receiving tubes. All assignments are documented and logged in the schedule. The loading process is completed.
comp. 4
comp. 5

5.3 Handling for drying BS-cooker

• • Schutzplatte mit Werkzeug von der Kopfplatte entnehmen, bergen.
• • Trocknungskopf mit Absperrventil, Dichtplatte mit Ventil zusammenbauen, Dichtsitz Ventil kontrollieren, dann an Werkzeug ankoppeln, mit Gestänge auf die Kopfplatte setzen, Ventil ist in Stellung Mitte. MERKER: Dichtbereich auf der Kopfplatte visuell kontrollieren; wenn erforderlich – reinigen, spülen.
• • Schrauben M16 an Dichtplatte anziehen, Drehmomentbegrenzung anfahren und dokumentieren.

vergl. 6

• • Schlauch an die Trocknungsanlage anschließen, Absperrventil am Trocknungskopf in Stellung zu, Trocknungskopf einschließlich Schlauch mit Stangenwerkzeug auf den Dichtungskopf aufsetzen, Schrauben drehmomentbegrenzt anziehen und dokumentieren.
• • Ventil der Dichtplatte über Werkzeug und Gestänge drehmomentbegrenzt nach oben gegen den Trocknungskopf drehen, dokumentieren.
• • Alle Arbeits- und Prüfschritte werden gemäß Ablaufplan durchgeführt und über Prüfvermerke bestätigt.

vergl. 7 The drying plant stands on the pelvic floor and is ready for use, the helium bottle is connected to the system. The drying head with shut-off valve and the hose, the sealing plate with valve and the transport head are also located on the basin floor. The torque limiter and the bar tools are prepared

• • Remove protective plate with tool from the top plate, recover.
• • Drying head with shut-off valve, assemble sealing plate with valve, check tightness of valve, then connect to tool, place with rod on top of headstock, valve is in center position. NOTE: Visually inspect the sealing area on the top plate; if necessary - clean, rinse.
• • Tighten screws M16 to sealing plate, approach torque limit and document.

comp. 6

• • Connect the hose to the drying system, put the shut-off valve on the drying head in the closed position, place the drying head including the hose on the sealing head with a rod tool, tighten the screws with torque limitation and document them.
• • Turn the valve of the sealing plate over the tool and linkage, torque-limited upwards against the drying head, document.
• • All work and test steps are carried out in accordance with the schedule and confirmed by test reports.

comp. 7

5.4 Drying of the BS filler, filling with helium

• • The Drying plant is put into operation and running in the work area; the Plant and measured values are recorded.
• • The Shut-off valve on drying head with a bar tool in position Bring up. The drying begins.
• • The 4 to 15 liter water contained in the BS quiver is aspirated within 20 to 30 hours; Control over measurement of accumulated condensate in the drying plant and over the achieved vacuum over time. Thus, the accumulated in the interstices of receiving tube / use water is removed; It remains in the BS accumulated water of about 0.5 liters. (This residual quantity was taken into account in our calculations.) The drying plant (about 10 ^-4 mbar vacuum can be reached) is able to dry a large part of these amounts of water over longer drying times.)
• • All relevant operating data are recorded and documented.
• • Is reached the desired degree of drying, helium is after the given Procedure in the BS capsule filled (He-Filling 0.5-0.6 bar).
• • All Work and test reports be according to schedule carried out and over check note approved.

• comp. 8th

5.5 Completion of the packaging

• • To completed drying and filling BS-cooker with helium, valve of the sealing plate via tool and linkage torque-secured Turn down against the seat in the sealing plate, document. In order to the gas-tight finish is made.
• • The Shut-off valve on drying head with rod tool in position Bring to.
• • drying head disassemble with rod tool, retrieve with hose to the pelvic floor, Disconnect hose from drying system, decontaminate.
• • All Work and test steps be gem. Schedule executed and over check note approved.
• • Transport head Place with rod tool on the sealing plate, screws secured against torque tighten and document, secure screw connections.

This completes the packaging.
comp. 9

5.6 Transfer to a storage container

The Insert the finished packed BS-bag into the intended edge position of the storage container takes place by the operator. The handling is analogous to the BE handling.

As a general rule: All assembly and test steps, which are to be attributed to the handling and transport of the BS quivers according to test sequence plan KTA 3905-4.3. The assembly and test steps, which serve the packaging are constructed according to an analogous test sequence carried out.

Terminology and list of abbreviations

• BS quiver - fuel rod quiver
• BE fuel element
• BS quiver - boiling water reactor
• BAM - Federal Office for materials management
• KAM - box scraper
• CASTOR - Storage tanks for fuel assemblies (Product name)
• Helicoflex - coated Metal seal (product name)
• washers
• Handrails
• transport head
• headstock
• protection plate
• drying head
• footplate
• Sealing plate with valve
• foot
• head
• screwdriver nose
• storage containers
• drying plant
• shut-off valve
• tube
• interim sleeve
• capsules
• receiving tube
• tube bundle
• end plugs
• bar tool
• Torque secured
• Distanzszück

Claims (11)

Apparatus for storing fuel rods of Boiling water reactors consisting of a quiver with one of the requirements conformable Number of to a bundle combined Pick-up ears in a headstock and a footplate shrink wrapped are, with a seal by silver-coated metal seals he follows. Device according to claim 1, characterized in that that the receiving tubes of the tube bundle through Washers are kept at a distance. Apparatus according to claim 1, wherein the head portion solid and rigid is, and the clamping of head and foot plate with the receiving tubes over torque-secured Screws done. Apparatus according to claim 1, wherein the arrangement in the area of the seal takes place such that water pockets avoided become. Device according to one of claims 1 to 4, in which the Fuel rod quiver in external positions the storage container are adjustable to lower by lower temperature load Internal pressure in the fuel rod quiver to ensure. Device according to one of claims 1 to 5, wherein the Fuel rod quiver with its stainless steel mass as a shield leads to the wall of the storage container. Process for the storage of fuel rods of Boiling-water reactors, using a quiver according to one of claims 1 to 6, in which a drying of the fuel rod holder by connecting to a drying plant done, with the fuel rod quiver be dried so far that residual water remains in the columns of the fuel rods, causing a warming by evaporation leads to pressure buildup in the fuel rod quiver. The method of claim 7, wherein the drying over a longer Evacuation time carried out is, with the measured values and the aggregate conditions of the drying plant and whose backup and documentation are accepted. Method according to one of the preceding claims, characterized through the use of interim sleeves to accommodate fuel rod breakage immediately at the fuel element repair to avoid a repeated contamination of the pool water when loading in the Fuel rod quiver. Method according to one of the preceding claims, in which the sealing area of the top plate during loading by a Protection plate against damage protected becomes. Method according to one of the preceding claims, in the handling with and on the interim sleeves, the fuel rods and capsules and the components of the head of the fuel rod quiver simple rod tools, with the necessary clamping forces for the seals and the stop of the transport head of the fuel quiver torque-secured be applied.