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**INTRODUCTION:**

This web page deals with FNR fuel bundles.

**DEFINITIONS:**

Fuel Bundle = assembly that must be totally replaced when fuel is reprocessed

Fuel bundle = control bundle + surround bundle

surround bundle = fixed portion of fuel bundle

control bundle = vertically slidiing protion of fuel bundle used to set fuel bundle discharge temperature setpoint. The control bundles fall by about 1.0 m into the support tubes to cause a reactor shutdown.

hydraulic cylinder+ piston + push rod + lower push plate = used to move control bundle up and down

support tube = holds fuel bundle in correct position

**INDEPENDENT FUEL BUNDLES:**

In plan view each fuel bundle consists of a 15.5 inch X 15.5 inch square fixed surround bundle containing **300 fuel tubes** and a 10.25 inch X 10.25 inch square central control bundle containing **244 fuel tubes**. The discharge temperature of the fuel bundle is determined by the distance of insertion of the control bundle into the surround bundle.

The corner girders of the surround portion extend downwards 3 m below the bottom of the surround bundle and are outside the 12 inch X 12 inch support tubes. The corner girders of the control bundle extend 1 m below and above the control bundle. At the lower end of the control bundle corner girders is an arrow head shaped upper push plate that assits in orienting the fuel bundle during its installation.

In plan view the fuel bundle is a 24 X 24 array containing 576 theoretical fuel tube positions. At the outer corners of this aray are 4 corner girders, each of which occupies 5 fuel tube positions. Inside the surround portion is a 16 X 16 array containing 256 theoretical fuel tube positions. At the corners of this inner array are corner girders each of which occupies 3 fuel tube positions.
Hence the surround portion of the fuel bundle contains:

576 - 4(5) - 256 = **300 real fuel tubes**

and the central sliding portion contains:

256 - 4(3) = **244 real fuel tubes**.

It is convenient to refer to the central sliding portion of the fuel bundle as the control bundle and to refer to the surround portion as the surround bundle. When the control bundle is fully inserted into the surround bundle the reactor is at maximum power and should provide a liquid sodium discharge temperature of over 445 degrees C. When the control bundle is 1 m withdrawn from the surround bundle the reactor should be subcritical. The fuel bundle geometry limits the range of acceptable Pu concentrations in the fuel rods.

From a power control perspective each fuel bundle can almost be regarded as an independent FNR. Each fuel bundle has its own discharge temperature setpoint which is determined by the extent of insertion of the control bundle into the surround bundle. Under forced cold shutdown conditions gravity causes the control bundle to drop 1 m into the 12 inch X 12 inch support tube.

The corner girders on the control bundle are about 8 m long to act as slide guides for the control bundle. These are stops so that the control bundles do not travel either too far up or too far down.

The corner girders of the surround bundle are about 9 m long to carry the weight of the surround bundle down to the stops welded to the 12 inch X 12 inch support tubes near their bottoms.

When the control bundle is fully inserted into the surround bundle there is a 1 m high open space under the fuel tubes to allow horizontal liquid sodium flow.

At the bottom of the control bundle girders is a 10 inch X 10 inch X 0.5 inch arrow head shaped upper push plate that is welded to these girders. Below the upper push plate is a 10.75 inch X 10.75 inch lower push plate with its corners cut off. The lower push plate is supported by a 1 m long 3 inch OD push tube which in turn is driven by a 9.75 inch diameter piston. This piston slides inside a 10.75 inch OD, 9.75 inch ID X 1 m steel pipe that acts a a hydraulic cylinder. The hydraulic cylinder is located at the bottom of a 12 inch X 12 inch X 0.5 inch square tube 2 m high. As the control bundle withdraws it sinks up to 1 m into this 12 inch X 12 inch tube. To insert the control bundle into the surround bundle 60 psi liquid sodium is pumped under the piston which raises the push rod, lower push plate, upper push plate and hence the control bundle.

On the corners of the 12 inch X 12 inch X 0.5 inch support tubes are 8 slide guides that allow a sliding fit with the extended corner girders of the surround bundle. These slide guides are tapered at their tops to allow practical blind mating. These slide guides are vertically short to allow liquid sodium to easily circulate in the lowest 2 m of height under the tube bundle.

The support tubes are welded to 14 inch X 6 inch X 0.50 inch horizontal tubes each of which carries a line of 12 inch X 12 inch X 2 m support tubes that are spaced at 0.400 m intervals. The 14 inch X 6 inch X 0.5 inch tubes are themselves spaced 0.400 m center to center. This center to center spacing is set by bolted cross members.

The thermal power output from a fuel bundle is proportional to the gamma flux propagating up the closed end indicator tube.

The fuel bundle discharge temperature is indicated by the vapor pressure inside the closed end indicator tube.

The vertical position of the control bundle is indicated by the height of the top of the indicator tube.

Inside the 12 inch X 12 inch X 0.50 inch wall support tube is a hydraulic actuator formed from a 10.75 inch OD steel pipe with an internal piston. This actuator has a piston travel of about 1 m and is used to position the control bundle within the surround bundle.

The extent of insertion of the control bundle into the surround bundle is determined by the volume of liquid sodium inside the hydraulic actuator. The hydraulic tube is fed through the 14 inch X 6 inch tube. A small hole is cut in the 14 inch X 6 inch tube to allow hydraulic tube installation.

There is a 3 inch diameter push tube from the piston to the lower push plate. The 12 inch X 12 inch support tube has side apertures between 1 m and 2 m above its bottom that allow primary liquid sodium to easily flow to the bottom of the control bundles and to pass through the 12 inch X 12 inch support tubes to reach other fuel tube bundles.

**FUEL TUBE BUNDLE DIMENSIONS:**

The fuel tube bundle frame and shroud are fabricated from HT-9 steel (85% Fe, 12% Cr, 3% other, 0% C, 0% Ni).

The height allowances for the main fuel tube bundle components from bottom to top are: bottom support tube (2.0 m), contained piston cylinder 1.0 m, push tube 1 m, control bundle bottom girder extensions 1 m, bottom grating (0.1 m), fuel tubes (6 m), top grating (0.1 m), control bundle top girder extensions 1 m, upper diagonals (0.5 m), indicator tube (3.0 m), lifting eye (0.2 m) for an overall length of about 12.9 m.

The control bundle length and width are:

16 (5 / 8) inch - 2 (1 / 16) inch girder width reduction + 2 (1 / 8) inch control bundle cover + 2 (1 / 16) inch control bundle to surround bundle clearance = 10.25 inch.

The surround bundle length and width are:

10.25 inch + 8 (5 / 8) inch - 2 (1/ 16) inch girder width reduction + 2 (1 / 8) inch shroud + 2 (1 / 16) inch fastner allowance = 15.50 inch

Each FNR fuel bundle, including tolerance allowance, is nominally 15.5 inches long X 15.5 inches wide X 20 feet and has a mounting space allowance 0.400 m long X 0.400 m wide. There is approximately:

(0.400 m X 1 nch / 0.0254 m) - 15.5 inch = 0.248 inches tolerance in length and width to allow for 0.04 inches of differential thermal expansion + 0.104 inches of off ideal axis tolerance in any horizontal direction due to all causes.

The fuel tube height is limited by availability of 0.500 inch OD X 0.065 inch wall thickness steel tube

The fuel bundle length and width are limited by the weight of the lead shielded container needed to move a fuel bundle by truck.

**FUEL BUNDLE DESIGN:**

The purpose of the shroud is to prevent fuel tubes in adjacent fuel bundles rubbing against each other as the fuel bundles are installed and removed. The shroud walls are (1 / 16) inch thick sheet steel with fasteners that project at most (1 / 16) inch from the steel outer surface. To allow for fuel bundle shroud material swelling without buckling in the core region the shroud has vertical slots.

a 24 X 24 = 576 array of potential tube positions on 0.625 inch square centers. Each fuel bundle has a (1 / 8) inch thick steel shroud allowance consisting of 2 X (1 / 16) inch for the metal thickness and 2 X (1 / 16) inch for the fastener thickness. Hence tube bundle's outside length and width is nominally:

24 (5/ 8) inch + 2 (1 / 8) inch =

The mounting space is 0.400 m X (1 inch / 0.0254 m) = **15.748 inches**

Hence there is an additional:

(15.748 inch - 15.25 inch) / 2 = 0.249 inch

of fuel bundle length and width allowance to accomodate differential thermal expansion and off axis fabrication tolerances.

Each surround fuel bundle is structurally stabilized by its rigid corner angle girders, which allow fuel bundles to vertically slide past one another during fuel bundle installation and removal. These girders are:

1.8125 inches X 1.8125 inches X (1 / 2) inches X 9 m.

Twenty corner fuel tube positions on the surround bundle are lost due to corner girders, to which the shroud is attached.

24^2 - 4(5) - 4(3) = 576 - 32

= **544 real fuel tube positions**

The purpose of the shroud is to prevent fuel tubes in adjacent fuel bundles rubbing against each other as the fuel bundles are installed and removed. The shroud walls are (1 / 16) inch thick sheet steel with fasteners that project at most (1 / 16) inch from the steel outer surface. To allow for fuel bundle shroud material swelling without buckling in the core region the shroud has vertical slots.

**GRATINGS:**

The fuel tubes are held in position with respect to one another by the steel gratings at the top and bottom of each fuel bundle and by a 0.0625 inch thick divider wire winding around each fuel tube. It is of paramount importance that the bottom grating never fail so every fabricated unit must be tested out to its Specified Minimum Yield Stress (SMYS). The test force must be at least 3X the total supported fuel tube weight.

At the top and bottom of a surround bundle are steel gratings composed of 2 (48) pieces of .125 inch X 4.0 inch X 15.000 inch steel, for a total volume of:

2 (48) pieces / bundle X .125 inch X 4.0 inch X 15.000 inch = 720.0 inch^3

Of this amount the grating metal volume used on the control bundle is:

2 (32) pieces / bundle X .125 inch X 4.0 inch X 10.000 inch = **320.0 inch^3**

Hence the grating metal volume on the surround bundle is:

720 inch^3 - 320 inch^3 = **400 inch^3**

The mass of the control bundle gratings is:

320 inch^3 X (0.0254 m / inch)^3 X 7.870 X 1000 kg / m^3 = **41.269 kg**

The mass of the surround bundle gratings is:

400 inch^3 X (0.0254 m / inch)^3 X 7.870 X 1000 kg / m^3 = **51.586 kg**

The fuel tube bundle has 576 theoretical tube positions. Twenty (20) theoretical tube positions are occupied by corner girders.
Two hundred fifty-six (256) theoretical tube positions are assigned to the control bundle which must fit inside the 12 inch X 12 inch support tube. Of these 256 theoretical positions 12 are taken up by structural steel girders leaving **244** real fuel tubes in the control bundle.

Between the control bundle and the surround bundle is a (1 / 16) inch gap to provide reliable sliding clearance.

Note that the surround bundle bottom grating must transfer the weight of 300 loaded fuel tubes onto the surround bundle corner girders while still permitting unobstructed primary liquid sodium flow.

The control bundle bottem grating must transfer the weight of 244 loaded fuel tubes onto the control bundle corner girders while still permitteing unobstructed primary liquid sodium flow.

The diagonals connection between the indicator tube and the control bundle corner girders must also allow easy primary liquid sodium flow.

The 12 inch X 12 inch X 0.5 inch X 2 m support tube is welded to the steel floor frame. The 10.75 inch OD X 1 m hydraulic cylinder fits inside the bottom of the 12 inch X 12 inch support tube. There are 8 tapered slide guides welded onto the 12 inch X 12 inch support tube. The tapers assist in fuel bundle positioning. There is a piston that slides within the 10.75 inch OD hydraulic cylinder which is used to control the insertion of the control bundle.

Forming the shroud are 4 (1 / 16) inch thick steel sheets 15 inches X 240 inches for a volume of:

4 X 15 inch X 240 inch X (1 inch / 16) X (.0254 m / inch)^3 = 0.014748 m^3

The mass of this shroud cover per fuel bundle is:

+ [(0.014748 m^3)] X 7.870 X 1000 kg / m^3

= **116.07 kg / surround bundle**

**FUEL TUBE ASSEMBLY:**

At the bottom of each core fuel tube is a bottom plug. Above this plug are **4 X 0.600 m long X 8.93 mm diameter blanket rods** initially consisting of 90% uranium and 10% zirconium, **1 X 0.35 m long X 8.08 mm diameter core rod** initially consisting of 70% uranium-20% plutonium-actinide-10% zirconium alloy.

Above the top blanket rod is a 3.2 m high plenum to store spare liquid sodium, to permit core rod swelling, to permit differential sodium thermal expansion and to provide volume for accumulation of inert gaseous fission products. At the top of the fuel tube is a top plug. There is sufficient liquid sodium inside each fuel tube to provide good thermal contact between the fuel rods and the inside wall of the steel fuel tube and to chemically absorb the fission products bromine and iodine. Note that the sodium top level will decrease with fuel tube material swelling.

The purpose of the reactor is to supply the required nuclear heat. The depth of the liquid sodium in the pool is 12 m. The heat is emitted by the reactor core zone, which is situated betwen 4.2 m to 4.6 m above the bottom of the liquid sodium pool.

**CORE AND BLANKET FUEL RODS:**

Each fuel tube contains 1 X 0.35 m core rod and 4 X 0.6 m blanket rods.

Mass of fuel rods per fuel tube :

(1)(0.28725 kg / core rod) + 4 (0.59690 kg / blanket rod) = **2.67485 kg / fuel tube**.

**Fuel Tube Steel:**

Mass = Pi [(0.5 inch)^2 - (0.37 inch)^2] / 4 X 6.0 m X (.0254 m / inch)^2 X 7.874 X 10^3 kg / m^3

= **2.7075 kg**

**Fuel Tube End Plugs:**

Mass = 2 X Pi X (.25 inch)^2 X .15 m X (.0254 m / inch)^2 X 7.874 X 10^3 kg / m^3

= **0.2992 kg**

**Sodium:**

Each fuel tube contains sufficient liquid sodium to cover the core and blanket rods up to a height of 2.8 m to ensure good thermal contact between the rods and the enclosing steel tube.

The minimum volume of liquid sodium initially required inside a fuel tube to immerse the fuel rods is:

Pi [(.37 inch / 2)^2] [0.0254 m / inch]^2 [2.75 m] - Pi[(4.04 X 10^-3 m)^2 (0.35 m)] - Pi [(4.465 X 10^-3 m)^2 (2.4 m)]

= Pi [0.60721653 X 10^-4 m^3 - 0.0571256 X 10^-4 m^3 - 0.4784694 X 10^-4 m^3]

= **0.22500 X 10^-4 m^3**

The additional volume of liquid sodium required to accommodate a 10% increase in fuel tube diameter over a length of 2.8 m is:

[(1.1)^2 - 1] Pi [(.37 inch / 2)^2] [0.0254 m / inch]^2 [2.8 m]

= **.407885 X 10^-4 m^3**

Hence the minimum amount of sodium in a fuel tube is:

0.22500 X 10^-4 m^3 + .407885 X 10^-4 m^3 = 0.632885 X 10^-4 m^3

The mass of this sodium is:

0.632885 X 10^-4 m^3 X 927 kg / m^3 = **0.058668 kg**

**TOTAL FUEL TUBE MASS:**

Fuel Rods + tube steel + end plug steel + sodium

2.67485 kg + 2.7075 kg + 0.2992 kg + 0.058668 kg = **5.7397 kg**

**SURROUND BUNDLE MASS:**

4 surround corner angle girders

4 X (1 / 2) inch X (5 / 2) inch X 9 m X (.0254 m / inch)^2 X 7.874 X 10^3 kg / m^3

= **228.60 kg**

4 surround girder reinforcements

Volume = 8 (1.5 inch X 0.25 inch) X 3 m = 9 inch^2 - m

Mass = 9 inch^2 - m X (.0254 m / inch)^2 X 7.874 X 10^3 kg / m^3 = **45.72 kg**

Forming the shroud are 4 (1 / 16) inch thick steel sheets 15 inches X 240 inches for a volume of:

4 X 15 inch X 240 inch X (1 inch / 16) X (.0254 m / inch)^3 = 0.014748 m^3

The mass of this shroud cover per fuel bundle is:

+ [(0.014748 m^3)] X 7.870 X 1000 kg / m^3

= **116.07 kg / surround bundle**

**TOTAL SURROUND FUEL BUNDLE MASS**

300 loaded fuel tubes + 2 surround bundle gratings + 4 surround bundle girders + surround girder reinforcements + shroud cover

= 300 (5.7397 kg) + 51.586 kg + 228.60 kg + 4.645 kg + 116.07 kg

= **2005.841 kg**

**CONTROL BUNDLE:**

Indicator Tube: 5.563 inch OD X 0.258 inch wall X 3.5 m long

Mass = Pi X 5.563 inch X 0.258 inch X 3.5 m X (.0254 m / inch)^2 X 7.874 X 10^3 kg / m^3

= **80.169 kg**

Control bundle girders:

4 X (1 /2) inch X 3 X (1 / 2) inch X 8 m X (0.0254 m / inch)^2 X 7.874 X 10^3 kg / m^3
= **121.92 kg**

**Control Bundle Cover:**

Forming the control bundle cover are 4 (1 / 16) inch thick steel sheets 10 inches X 240 inches for a volume of:

4 X 10 inch X 240 inch X (1 inch / 16) X (.0254 m / inch)^3 = 0.0098322 m^3

The mass of this control bundle cover per control bundle is:

+ [(0.0098322 m^3)] X 7.870 X 1000 kg / m^3

= **77.38 kg / control bundle**

Upper push plate:

The upper push plate is arrow head shaped to assist with installation alignment:

Volume = (4 X 9.0 inch X 5 inch X 0.5 inch) = 90 inch^3

Mass of upper push plate = 90 inch^3 X (0.0254 m / inch)^3 X 7.874 X 10^3 kg / m^3

= **11.61 kg**

Indicator tube connectors:

Volume = 4 X 3 inch X 6 inch X 0.5 inch = 36 inch^3

Mass of indicator tube connectors = 36.0 inch^3 X (0.0254 m / inch)^3 X 7.874 X 10^3 kg / m^3

= **4.645 kg**

**TOTAL MASS OF CONTROL BUNDLE:**

244 loaded fuel tubes + 2 control bundle gratings + 4 control bundle girders + indicator tube + upper push plate + indicator diagonals

= 244 (5.7397 kg) + 41.269 kg + 121.92 kg + 80.169 kg + 11.61 kg + 4.645 kg

= **1660.1 kg**

**TOTAL ACTIVE FUEL BUNDLE MASS:**

Surround bundle + control bundle

= 2005.841 kg + 1653.7 kg

= **3659.54 kg**

**SUPPORT ASSEMBLY MASS:**

The mass of each complete fuel bundle assembly is significant. The major mass components consist of:

Support Tube 12 inch X 12 inch X 0.500 inch wall X 2.0 m long

Mass = (12^2 - 11^2) inch^2 X 2.0 m X (.0254 m / inch)^2 X 7.874 X 10^3 kg / m^3

= **233.67 kg**

Support tube wings:

Each support tube has 4 welded wings 3.74 inch long X 1.5 m high X 0.5 inch thick which stabilize the support tube against adjacent support tubes. The wings are located slightly off center so that adjacent wings overlap and are bolted together to give the overal structure stability.

The minimum support tube wing mass is:

4 X 3.74 inch X 0.5 inch X 1.5 m X (0.0254 m / inch)^2 X 7.874 X 10^3 kg / m^3

= **56.997 kg**

**Guides:**

There are 8 guides to contol the sliding fit of the surround bundle legs over the support tube. Each guide is an L shaped piece 1 inch thick X 2 inches X 3 inches.

Guide Mass = 8 X 3 inch^2 X 3 inch long X (.0254 m / inch)^3 X 7.874 X 10^3 kg / m^3

= **9.29 kg**

Hydraulic Cylinder:

Mass = Pi (10.750^2 - 9.759^2) inch^2 / 4 X 1 m X (.0254 m / inch)^2 X 7.874 X 10^3 kg / m^3

= **81.79 kg**

Hydraulic cylinder bottom:

Mass = Pi (9.750 inch / 2)^2 X 0.5 inch X (.0254 m / inch)^3 X 7.874 X 10^3 kg / m^3

= **4.8168 kg**

Piston:

Piston Mass = Pi (9.750 inch / 2)^2 X 0.5 inch X (.0254 m / inch)^3 X 7.874 X 10^3 kg / m^3

= **4.8168 kg**

Push Tube:

The push tube is 1 m long. Use same material as indicator tube.

Push Tube mass = Pi X 5.563 inch X 0.258 inch X 1.0 m X (.0254 m / inch)^2 X 7.874 X 10^3 kg / m^3

= **22.9 kg**

Lower Push Plate:

Mass = 10.75 inch X 10.75 inch X 0.5 inch X (.0254 m / inch)^3 X 7.874 X 10^3 kg / m^3

= **7.45 kg**

**BASE:**

The 12 inch X 12 inch X 0.5 inch support tubes are welded to a base made from 14 inch X 6 inch X 5 / 8 inch rectangular tube. Note that access holes are cut into the base material to allow running hydraulic lines. The support tubes are spaced 0.400 m center to center using 1.574 inch spacers and bolted to cross beams at each end.

=

The surround bundle girder stops transfer the weight of the surround bundle from the surround bundle girders onto the support tubes. The 4 surround bundle girder stops are fabricated from 1.75 inch X 1.75 inch X 0.5 inch angle and are each 4 inches long.

Surround bundle girder stop mass = 4 X 3.0 inch X 0.5 inch X 14 inch X (.0254 m / inch)^3 X 7.874 X 10^3 kg / m^3

= **10.83 kg**

**TOTAL SUPPORT SYSTEM MASS PER FUEL BUNDLE:**

Mass of support = base + support tube + support tube wings + 8 guides + Hydraulic cylinder + hydraulic cylinder bottom + Piston + Push tube + lower push plate + surround bundle girder stops

= 51.6 kg + 233.67 kg + 56.997 kg + 9.29 kg + 81.79 kg + 4.8168 kg + 4.8168 kg + 22.9 kg + 7.45 kg + 10.83 kg

= **484.1606 kg**

**TOTAL MASS PER FUEL BUNDLE OF CONTROL BUNDLE + SURROUND BUNDLE + SUPPORT:**

Surround bundle + Control Bundle + support

= 2005.841 kg + 1653.7 kg + 484.16 kg

= **4143.7 kg**

**TOTAL REACTOR:**

** FNR TUBE BUNDLE ASSEMBLIES:**

The reactor active core is an octagonal assembly of fuel tube bundless based on a 26 bundle X 26 bundle square with straight sides 10 bundle widths long and diagonal sides of length:

[2 X (8 bundle widths)^2]^0.5 = 11.3 bundle widths long. This shape is realized by cutting 36 bundles off each corner, so that the total number of active bundles is given by:

26^2 - 4(36) = 676 -144

= **532 active bundles**

If the passive blanket fuel bundles are included the assembly is based on a square of **32 bundles X 32 bundles** with 55 bundles clipped off each corner. The four straight sides are each **12 bundle widths long**. The nominal length of each diagonal side is given by:

1.41 X 10 = **14.1 bundle** widths

The total number of fuel bundles is:

32^2 - 4(55) = 804 bundles

Hence the number of blanket bundles is:

804 - 532 = **272 blanket bundles**

**PASSIVE FUEL BUNDLES:**

In order to achieve fuel bundle interchangability the passive fuel bundles are made and installed in the same manner as the active fuel bundles, although that introduces some unnecessary complexity into the passive fuel bundles.

**REACTOR MASS IMMERSED IN PRIMARY LIQUID SODIUM:**

The total number of fuel bundles is 804.

Mass = 804 fuel bundles X 4143.7 kg / fuel bundle

= 3,331,534.8 kg

= **3,332 tonnes**

**PLUTONIUM REQUIREMENT:**

Total reactor core rod mass = (532 X 544) core fuel rods X 0.28725 kg / core rod)

= **83,132.45 kg**

= **83.13 tonnes**

The required plutonium mass per reactor is:

0.2 (83.13 tonnes) = **16.63 tonnes**

This plutonium can be obtained by reprocessing of spent CANDU fuel.

The amount of plutonium readily available from spent CANDU fuel is about:

0.0038 X 50,000 tonnes = 190 tonnes. Hence at this time in 2017 in Canada there is only enough plutonium available to start about:

190 tonnes / 16.63 tonnes / reactor = 11.43 power FNRs. It is clear that in FNR planning a very important objective is breeding additional plutonium for starting future FNRs.

Total reactor blanket rod mass = 1,897,472 blanket rods X 0.0.5969 kg / blanket rod)

= **1,132,601 kg**

= **1,132.6 tonnes**

The ratio:

(blanket rod mass) / (core rod mass) = 1,132.6 tonnes / 83.13 tonnes

= **13.624**

**ASSEMBLY OF FUEL BUNDLES:**

The total installation allowance width of the core and blanket tube bundle assembly is:

32 X 0.400 m = **12.8 m**

Between the outside of the reactor blanket and the sodium tank side wall is a 2.8 m thickness of liquid sodium. Hence the liquid sodium pool inside width is:

12.8 m + 2(2.8 m) = **18.4 m**

This web page last updated February 25, 2017

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