LD-89-093, Forwards Supplemental Info Re 890501 Application for Amend to License SNM-33 for Pellet Production W/Enriched U in New Bldgs & Equipment at Fuel Mfg Facilities

Forwards Supplemental Info Re 890501 Application for Amend to License SNM-33 for Pellet Production W/Enriched U in New Bldgs & Equipment at Fuel Mfg Facilities

ML20246F932
Person / Time
Site:	07000036
Issue date:	08/18/1989
From:	Scherer A ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY
To:	Rouse L NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
25874, LD-89-093, LD-89-93, NUDOCS 8908310176
Download: ML20246F932 (34)

Text

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COMBUSTBON ENGlNEER; AUG221989 ) --I D-89-05 3, AUG221989 ) Y uA$! Tion Dy M

Docket No. 70-f License No. SN t

DOCKLT CLERK Mr. Leland C. Rouse,

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Fuel Cycle Safety Branch Division of Industrial and Medical Nuclear Safety Office of Nuclear Material Safety and Safeguards Attn: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C.

20555

Subject:

Supplemental Information for Hematite License Amendment Request

Reference:

Letter LD-89-049, A. E. Scherer (C-E) to L. C. Rouse (NRC), dated May 1,1989

Dear Mr. Rouse:

In the Reference, Combustion Engineering submitted a license amendment request for pellet production with enriched uranium in new buildings and equipment at the fuel manufacturing facilities in Hematite, Missouri. In the Enclosures to this letter we are providing information that supplements the description of methods and procedures for moderation control and revises the description of nuclear safety evaluation in the new equipment.

Enclosure I lists the pages of the reference amendment that are to be changed.

Enclosure II is replacement and additional pages to the reference amendment request.

Ten (10) copies of the Enclosures are provided for your use.

If I can be of any assistance on this matter, please do not hesitate to call me or Mr. J. F. Conant of my staff at (203) 285-5002.

j Very truly yours, COMBUSTION ENGINEERING, INC.

1 is 1Y A. d erer Director AES:jeb Nuclear Licensing

Enclosures:

As Stated J

cc:

G. D. France (NRC-Region III) j M. L. Horn (NRC)

I I

D. A. McCaughey (NRC) j Power Systems 1000 Prospect Hill Road (203) 688-1911 Combustion Engineering, Inc.

Post Office Box 500 Telex: 99297 s r, nne 095-0500 8908310176 890818 PDR ADOCK 07000036 g;g y g

j

Docket No. 70-36 License No. SNM-33 i:

l ENCLOSURE I COMBUSTION ENGINEERING, INC.

HEMATITE NUCLEAR FUEL MANUFACTURING FACILITY SUPPLEMENT TO REQUEST FOR LICENSE AMENDMENT LIST OF AFFECTED PAGES August 18, 1989

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.g Docket No.: 70-36 License No.'SNM-33 August 18, 1980' HEMATITE NUCLEAR FUEL MANUFACTURING FACILITY.

SUPPLEMENT TO REQUEST FOR LICENSE AMENDMENT-Combustion Engineering r'equests. that the May 1,1989. amendment request on License' No. SNM-33'for its Hematite Nuclear Fuel Manufacturing Facility be' supplemented-with.the pages in Enclosure. II.

These pages provide supplemental ;information on the methods and procedures. for moderation control'in'the new equipment.

The license pages affected by the May 1,1989. amendment request and their

-respective revision numbers are included in the list below for convenience.

~ hat are affected by this supplement are underlined.

The-Pages t

supplemental change pages are contained in Enclosure II.

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.:e List of Affected Pages Deleted Page Added Page Page No.

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Underline designates pages affected by supplement.

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License No. SNM-33, Docket 7L.6 Date:

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l List of Affected Pages (continued)

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List of Affected Pages (continued)

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l License No. SNM-33, Docket 70-36 Date:

08/18/89

l

..e Docket No. 70-36 License No. SNM-33 ENCLOSURE II COMBUSTION ENGINEERING, INC.

HEMATITE NUCLEAR FUEL MANUFACTURING FACILITY SUPPLEMENT TO REQUEST FOR LICENSE AMENOMENT PROPOSED LICENSE AMENDMENT PAGES 1

2 I

August 18, 1989

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4.'2. 3 Safety Margins for Individual Units (continued).

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'(continued) 4.

NO Scrubber x

5.

Centrifuge Supernate Recycle 4

'6.

UO precipitate Overflow Vessel 4

')

The ' hygrometers on the plant air to the Air Mix Blenders k

~

in the Oxide Building and to the micronizers and blenders in Building 254 will be set to alarm - at a dewpoint no higher than 0 C and checked on a six month interval.

The hygrometer on the cooler hopper at the exit of the screw cooler in the oxide building will-be; set'. to alarm at a dewpoint no higher than 15*C and checked on a six month period.

1)

The water content 'will ' be verified to be less than one weight percent in storage cans in the conveyor storage area on a production lot basis (contents of two air mix blenders).

m)

.The R-2 steam line will have two (redundant) fail-safe shut-off valves, each activated by two independent high and low temperature alarms setpoints on the R-2 reactor.

The operability of this system will be ascertained at least once every six months.

n)

The moisture content of the 002 powder transferred into the bulk. storage hoppers and the recycle storage hoppers -

will be verified as being <1 w/o.

i License No. SNM-33, Docket 70-36 Revision 4 Date:

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8.1. 2 '

UF; Conversion Process (continued) with pipe insulation.

Any UF leak is either -visually. detected' from its typical "UF 6

6 i

cloud" formation-or the cloud is identified by the smoke detector in the vaporizer area and alarmed.at'the control panel board.

In the event of such leak,.an emergency alarm will be sounded,~ the area evacuated and the ; emergency procedure put into effect.

Self contained breathing apparatus and protective clothing will be worn to correct the -leak.

UF fl w can be 6

terminated from the control panel or at the vaporization charibe r.

Air sampling and decontamination will be done as required to cope with suspected or actual releases of airborne activity.

l The UF6 U0 conversion is accomplished in the reactor 2

vessels shown in Figures II.9-1 to :I.9-3.

1 i

The hot dry UO2 product from the final reactor passes through a.

9 water jacketed screw type cooler.

The oxide granules exit the cooler and drop into the cooler hopper.

From the cooler hopper, the oxide is transferred pneumatically by a vacuum system that uses room air for transport to one of several inprocess storage vessels in the oxice building.

)

Offgases from the conversion process are routed to j

limestone-packed scrubbers for hydrogen fluoride removal.

I Material transfers from vessel to vessel is through maximum two

]

1 inch diameter piping.

Refer to the Nuclear Safety Eva"uation, UF to UO conversion, 6

2 in Section 11.9.1.

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'8.1.3-In-process Storage The UO product from the cooler is in the form of granules.

2 The granules are transferred for in-process storage to either of two tall 12 inch diameter silos or to a 14 inch diameter receiver vessel (formerly blender vessel No. 4).

UO granules 2

are transferred to the silos when the production run requires milled powder to be shipped as. powder or fabricated into pellets in Building 255.

The processes in Building 255 are described in Section 8.2.

Alternatively, the granules' are transferred to the 14 inch diameter receiver, loaded by gravity into. bulk storage hoppers and wheeled to Building 254 for pelletizing.

The process in Building 254 is described in Section 8 3.

1 Transfer lines connecting individual pieces of equipment in the Oxide Building are two inches in' diameter or less.

This is a-dry operation and is nuclearly safe for enrichments. not exceeding 5% as per TID-7028.

Siles are spaced on four foot

centers, forming -an inline array.

The Nuclear Safety Evaluation is provided in Section 11.9.0.

8.2 Building 255 powder preparation and Pellet Fabrication 8.2.1 Milling 002 granules stored in the silos in the Oxide Building flow by gravity to the mill.

Process milling equipment consists of 10-inch diameter hoppers which taper to three inch discharge openings to the mill.

Scrap recycle charge containers are five gallon pails (19 liters) which are emptied into tapered hoppers, which discharge to the mill.

This also is a dry operation with the License No. SNM-33, Docket 70-36 Revision:

1 Date:

08/18/89

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d 8.2.5 Building 255 powder Storage'and Press Feed Storage The agglomerated. press feed in -the metal buckets. sealed with a locking ring -clamp, is stored on : a 1/4 inch thick steel mezzanine located above the product storage conveyors (Drawing:

D-5007-2001, Sheet 9). This mezzanine.is 81/2 feet above the concrete floor and the buckets are stored in a 6: x 8 array on 24-inch centers.

Metal rings' are used to maintain this spacing.

The nuclear safety evaluation of the-storage conveyors and mezzanine is given in' Section 11.8.3.4.2 where the presence of the bulk.-storage hoppers in' the north corridor of building 255 is incorporated into a KENO analysis.

O 8.2.6 Building 255' pressing.

Granulated material, contained in 5-gallon pails, is considered to. be homogeneous for criticality safety evaluations.

~The gallon. pails of blended material are attached to the press-feed hopper mounted above each press.. From this hoppe'r, the material is gravity-fed to the press.

The pressed pellets.

'are randomly loaded into boats or placed on' corrugated trays.

l Pellets, when randomly leaded, pack to an average density of 5.95 gm/cc, with a one sigma variation of 0.264,.as determined from a series of 14 measurements.

Thus, at a 95% confidence level, the volume of H 0 to volume of 00 ratio does not exceed p

2 l

1.0 and from Fig. 1.E.16 of UKAEA bandbook ASHB1, the critical slab thickness is 6.2 inches.

Divicing by the safety margin of 1.2 results in a slab thickness of 5.2 inches.

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l License No. SNM-33, Docket 70-36 Revision:

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f 8.2.7 Building 255 Dewaxing and Sintering

- P'ressed pellets are dewaxed' and then sintered to achieve the specified ceramic. properties. Pellets are loaded onto trays or are randomly loaded into sintering boats to a maximum safe. slab height. The boats or trays are' charged through the controlled-atmosphere furnaces.

8.2.8 Building'255 Grinding Sintered pellets are transferred to the grinder feed system and ground under a stream of coolant.

The coolant is recirculated at a uranium concentration of considerably less than one gram per liter.

The infeed, grinder and 'the outfeed pellet.

configurations are limited to a safe slab thickness.

Grinder aiudge is removed by a. certrifuge.and stored in mass limited SIUs. - This material' is cried in an even and stored awaiting final disposition.

A complete enclosure is provided around the' grinder to preclude-custing of U0.

This enclosure is maintained at a slight 2

negative pressure with respect to the room.

The centrifuge is limited to a safe volume of less than 10 l

liters anc is provided with a spacing area of 4.0 ft.2 Water from the centrifuge collects in a 19 liter sump and is pumped back to the grinder.

The centrifuge sump is proviced with a 2

spacing area of 80 ft.

The centrifuge is cleaned periodically as required to permit continued operation.

License No. SNM-33, Docket 70-36 Revision:

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~*a 8.2.8 Building 255 Grinding (continued)'

Properly sired pellets are transferred on a conveyor to trays which are 'then moved to the inspection area'.

The pellets' move

.in a safe slab configuration.during inspection operations.

After inspection, the pellets are stored in a safe slab and then packaged for shipment.

The' safe slab -limit here is that applicable to corrugated trays.

8.2.9

' Building 255 Packaging

-The pellets awaiting packaging will form a safe ' slab with ' a thickness less than the safe thickness shown in Table I.4.2.4.

The pellets are packaged in the licensed shipping containers in.

accordance with the applicable certificate of compliance.

8.3 Building 254 Powder Preparation anc pellet Fabrication 8.3.1 Building 254 Milling and Blending Virgin UO granules from a production run intended for 2

pelletizing in Building 254 are transferred by gravity from the-14 inch diameter receiver in the Oxide Building into bulk storage hoppers.

To make the transfer, a bulk storage hopper (Figure ~11.8.3-1) is connected through a flange 'and flexible connector to the valve at the bottom of the receiver.

A hood.

1' l

prevents ingress of extraneous materials and exit of oxide dust while making and breaking this connection.

During the transfer, the bulk storage hopper sits on a scale.

[

The operator compares the initial weight with the known tare weight to verify that the hopper is empty.

At intervals of about two hours, the operator discharges about 100 Kg of oxide License No. SNM-33, Docket 70-36 Revision:

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~8.3.1 Building'254 Milling and Blending (continued).

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'from the receiver into the hopper. Prior to each discharge the operator verifies that the.msisture content'of.the oxide in'the-receiver does 1 not exceed 1.0 weight percent.

After filling, the hopper is disconnected from the receiver, the hopper-filling connection is sealed with a blank flange cover andl the-hopper-is moved to storage.

The " hoppers move by wheeled transporter through Building '255 into Building 254.

There ar e. up to 54. hoppers.

Nuclear criticality. criteria: are satisfied.with any arrangement of-loaded hoppers at the north end of Building-254 (see Section.

8. 3. 4. '3 ).

Recycle oxide' pcwder. is accumulated in pails in Building 253 and. periodically is combined into. a wheeled recycle hopper -

.. ( Fi gure 11. 8. 3-2 ).

Each pail is sampled to verify that the, maisture content is no' greater than.1.0 weight percent.

Also, the recycle. hopper is' visually inspected when it-is loaded into the transfer hood to verify that it does not contain' water.

When the hopper is filled, the oxide is blended and resampled to verify that the moisture content is no greater than 1.0 weight percent.

The hopper is then sealed with a blank: flange cover and wheeled to storage.

After it is verified that the moisture content in the blended oxice sample' is no greater than 1.0 weight percent, the hopper may be celeased to Building 254'.

In Building 254 there are two parallel pellet lines.

Each has-the same equipment and the same controls including one virgin oxide unload hood, one recycle unload hood, one mill, three blenders and one pellet fabrication line.

License No. SNM-33, Docket 70-36 Revision: 0 Date:

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The oxide blenders may rer.eive oxide from two sources - the virgin cyide bulk storage hoppers and the recycle hoppers.

A hopper is lifted above either the virgin oxide unload hood or q

the recycle unload hood and oxide is fed from the hopper to the 1

mill (micronizer) by means of a vibratory feeder.

The powder passes through the micronizer and is transferred pneumatically to the oxide blender.

The transfer air is filtered locally and is discharged through the plant HEPA filter system.

The milled oxide from several storape hoppers accumulates in the oxide blender (Figure 11.8.3-3).

It is subsequently blenced into a homogeneous batch by the action of air jets located at the lower end of the blender.

Plant air is emoloyed for the blending operation.

Blend air exits through the same filters as did the transfer air.

Periodically the filters are blown back by a pulse of plant air to remove accumulated oxide.

After blending, the oxide powder passes through a rotary valve at the bottom of the blender and 's transferred pneumatically by a vacuum system up to the first stage of the pelletizing cycle.

The vacuum system draws room air from the vicinity of the rotary valve for the transfer.

8.3 2 Building 254 Agglomeration, Granulation and pressing Blended U02 p wder transferrco

'.e, the receiver at the top of the pelletizing line drops through a series of process steps ending at the gallet press.

The steps may provide addition of poreformer, addition of lubricant, addition of press fines, mixing, agglomeration by dry powder slugging and granulation.

The granulated powder flows freely for the final pellet pressing operation.

Each pellet line in E,uilding 254 includes these powder preparation steps.

License No. SNM-33, Docket 70-36 Revision:

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8.3.2 Building 254 Agglomeration, Granulation and pressing (continued)

Granulated powder flows by gravity. to the multiple die rotary press.

There are two presses in Building 254, one for each pellet line.

Green pellets from the press are randomly loaded into boats for the furnaces.

Safety analyses of the boat configuration are provioed in Section 11.8.2.6.

8.3.3

. Moderation Control Evaluation Criticality safety for the storage hoppers. and the. blenders is achieved with moderation; con 6rol. _ This control prevents the' entrance of moisture into these vessels from the time of oxide transfer from the screw cooler to the receiver in the oxide building, through all pelletizing operations, until pellets are transferred to the furnace line in Building 254.

Moderation control is considered established when the criterion in Section 1.4.2.3(n) limiting the moisture content to 1.0 weight percent is satisfied.

Prevention of moisture entrance is assured by a combination of design, automatic instrumentation and administrative procedures in the form of Operation. Sheets.

Table II.8.3-1 lists the measurements, allowable values and automatic and operator actions for important steps in the process.

By these means, the principle of double contingency is implemented, leading to I

the conclusion that violation of the criterion in Section I.4.2.3(n) is not credible.

Evaluation of moisture control at each process step involving the hoppers and blenders follows.

Analytical calculations that establish the bases for the criterion are described in Section II.8.3.4.

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'8.3.3.1 Moderation Control 'During Bulk Storage Hopper Leading' and

. Transport w

The first moisture-measurement is made in the hopper at the exit of the water ' jacketed screw cooler in the oxide twilding.

If the dewpoint in the screw cooler hopper rises above 15*C, a moisture detector signal initiates - an alarm in-the oxide-building and an automatic shutoff of the vacuum transfer blower to.the' receiver vessel.

i The next. moisture check is a procedural requirement on the Operation Sheet.

The operator first verifies that'. the bulk L

storage hopper is empty by weighing it.

Then a' backup measurement of moisture content in the oxide in the receiver is-made before loading it into'the bulk storage hopper.

After the hopper is loaded, moisture in -the hopper is controlled by equipment design.

The hood arrangement at' the connection between the receiver and the bulk storage hopper-blocks water era 'ince while the top flange cover is off during-loading.

The mechanically sealed flange cover prevents moisture entrance after the hopper is dier.onnected.

There are no other top openings into the all-welded. stainless steel hopper.

C5 sign also minimizes the potential for rupture of the bulk storage I opper during transport to Building 254.

The hopper walls are V4 to 5/16 inch thick stainless steel, a tough, ductile material. The wheeled transporter is manually operated by a walking operator, thereby limiting the potential impact velocity.

By these means, the criterion I.4.2.3(n) is satisfied for the bulk storage hoppers.

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' 8.3.3.2 Moderation Control During Recycle Hopper Loading

~By-procedure, the operator. makes two independent moisture measurements on the oxide in.the recycle. hoppers in Building 253.

The oxide in each. pail to be loaded into the hopper is y

sampled and measured before loading.

After the hopper is-loaded and the oxide is blended, the blended oxide is sampled.

The recycle hopper is released if the moisture content does not exceed

.1. 0 weight percent.

By these

means, criterion I.4.2.3(n).is satisfied for the recycle hoppers.

8.3.3.3 Moderation Control During Milling and Blencing By design of the unload hood, water is prevented from entering t.be. exide stream during unloading of the bulk storage and recycle hoppers, even though there is no water source in the vicinity of the unload hoods. The only other entrance path for moisture at the unload step is via the plant air supply employed for milling.

The air compressor employs moisture separators and dryers that lower the exit air dewpoint to

-40 C.

Two independent moisture detectors measure moisture in the 3

plant air supply.

A detector located at the exit of the air dryer alarms in Building 254 if the dewpoint rises above 0*C The seconc detector, located ahead of the blenders at the exit of the air accumulator, monitors plant air delivered for milling, blending and pulsed filter cleaning.

The second detector alarms at a dewpoint of 0 C and also automatically j

stops the vibratory feeders and shuts off air to the oxide License No. SNM-33, Docket 70-36 Revision:

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.. o 8.3.3.3 Moderation Control During Milling and Blending (continued) blender.

Thus, design and independent measurements and automatic instrument action assure that moisture is not injected'into the blenders during unloading or processing the oxide.

Building 254 containing the blenders is a free standing steel frame structure designed using a BOCA seismic zone 2 earthquake occupancy importance f actor of 1.5, thereby limiting potential damage to the oxide vessels by structural failure.

Ey these means, criterion I.4.2.3(n) is satisfied for the blenders in Building 254.

8.3.4 Nuclear Safety Evaluation for In-process Storage, Milling and pellet Fat rication The UO2 gracules processed in Building 254 are stored during processing in bulk storage hoppers that are filled in the Oxide Building, transported through the north corridor of Building 255 and stored in the north corridors of Buildings 254 and 255 and/or in the vicinity of the biencers in Building 254.

The safety evaluation adcresses three stages of the process:

1) filling, 2) transporting, and 3) storage.

Storage evaluation is combined with the overall analysis of the front-end of the pelletizing line, i.e., milling thrcugh pressing.

8.3.4.1 Filling of Bulk Storage Hoppers l

l The bulk storage hoppers are wheeied into the oxide conversion l

room one at a time on the transporter, filled from the receiver j

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l and wheeled to Building 254.

The filling process is analyzed i

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License No. SNM-33, Docket 70-36 Revision:

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3 8.3.4.1-Filling of. Bulk; Storage Hoppers (continued) 1 by a KENO, analysis of. the ' oxide room.

In' this mode ofi I

operation of the oxide room, the three reactors;and U0 cooler 2

are functional; a' piping change at the outlet of the UO.c ler 2

is.made.to bypass the two silos and to feed the receiver.

3 The following conservative-assumptions-are used-in; the calculational model of the UF to UO conversion ~ equipment 6

2 analysis:

a)

. Reactors R-l' and R-2 'are assumed to be filled in the '10" portion (i.e.,

no. overfill) with dry UO., at 2.5 g/cc-density of powder and 5.0 w/o U

[11 structures 235 3

consisting of.375" steel wall, 7.75" of 37.5 lbs/ft L

firebrick insulation and 0.25" steel casing are includedi in the model.

The reactor-details are shown in Figures 11.9-1 and 11.9-2.

b)

The R-3 reactor is assumed to be fillad in both the 10" and 12" portions (i.e., overfilled):with wet UO at 2.5 p

235 g/cc powder density and 5.0 w/o U The U0

- water -

2 mixture is equivalent to a UO / lume fraction of 0.23 and:

2 a

water volume fraction of 0.77.

All structures consisting of.375" steel wall, 7.75" firebrick insulation and.25" steel casing are included.in the model.

r c)

The cooler is assumed to contain UO with the same volume 2

L fractions of UO and water, an.d is surrounded by 1/2" of 2

water.

The steel structure is not modelled.

License No. SNM-33, Docket 70-36 Revision: 0 Date: 08/18/89 Page:

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.a d)

The silos are assumed to be empty. The.125" steel walls are modelled.

c) 00 blenders Nos.1, 2 and 3 are empty and No. 4 contains 2

UO with 5.0 w/o water.

The

.125" steel walls are 2

modelled.

f)

The UF scruher is assumed to contain &y UO with no 6

2 external structures modelled.

g)

The R-1 hcpper is assumed to be filled with dry 00 and 2

surrounded by 1"

of water.

Steel structures' are not modelled.

h)

An external mist of 0.001 g/cc is assumed.

-i)

A bulk storage hopper containing 1000 Kg of 5 w/o UO with 2

I w/o H O is modelled below blender No. 4.

2 The KENO-IV code with Hansen-Roach cross-sections is used to determine the criticality of the system.

With the above conservative assumptions, the K is 0.9744 1 0032.

0 eff 8.3.4.2 Transporting of the Loaded Bulk Sterage Hopper Through ouilding 255.

The east-west corridor between the north wall of building 255 and the virgin powder can storage conveyors is 110 inches wide.

Eight and one half feet above the corridor floor en a one-quarter inch thick steel mezzanine floor are the storage j

rings for positioning the sealed agglomerated feed buckets en

)

24 inch centers.

The number of storage positions is 48.

To

]

assess the criticality safety of the combined arrays of:

(1)

License No. SNM-33, Docket 70-36 Revision:

0 Date: 08/18/89 Page:

11.8-11b j

~

l

. = _.

y,

.4 g

9 l-conveyors loaded with virgin powder cans, (2) 48-agglomerated press fcad buckets,. and -(3) bulk storage. hoppers stored and/or-in transit' through the north. corridor, a - KENO-IV calculation i?

with Hansen-Roach cross sections is. employed with the following.

' assumptions..(See Drawing 0-5007-2001, Sheet 9,. revised.')

7 c.

a.

Yhe 48 agg'omeration press feel bWkets are arranged in a I

6 x.8 array on the mezzanine..The spacing between buckets is 2 feet.

Each bucket contains 41-kilograms. of - U02.

enriched to 6 w/o U-235 and 5 w/o water.

a b.

The virgin powder cans located en the 3 ' double ' height conveyors were modeled as 6 slabs. ' The height and width of the slabs are equal to the height and width ' of. the 11 inches -'and width 9.75 virgin powder cans (height

=

inches). The resulting slab contained 1 w/o water.

-c.

The bulk storage hoppers under the mezzanine were modeled as a 96 inch wide sl ab'.

TFe height of the slab was modeled as the height ot the top of the oxide level in a loaded bulk storage hopper, 53-inches.

d.

The roof of the building was represented as a 12 inch slab of water.

e.

The north, cast, and south walls were modeled as 12 inches of concrete. The west wall was modeled as 'a 12-inch slab of water.

f.

No structural material was modeled.

License No. SNM-33, Docket 70-36 Revision:

0 Date:

08/18/89 Page:

II.8-11i Cl__________

______.__..___.____.._____m

N P

q,

['

h7 The KENO-IV multiplication factor is: 0.847 10.004.

Based on L

this ' analysis, it is concluded that no criticality problem exists in the north corridor of Building 255 duringi transport.

L of a loaded bulk storhge hopper through the corr.i dor. to building 255 even. if the corridor is filled with loaded' bulk

' storage hoppers.

8.3.4.3 Bulk Storage' Hoppers;and Front-End of Pelletizing Line To assess the criticality safety of the front-end of the pelletizing line 'i n combination with filled bulk storage hoppers located on. the ground. floor of 'the north end of '

Building 254 between the south edge of the second floor and the north wall, KENO analyses are carried. out using' Hansen-Roach cross' sections.

Fixed equipment, i.e.,

hopper unloaders, micronizer, blenders and the. vertica. stacks of 002 process equipment from the vacuum receivers on tr e third floor down to the rotary ' presses ' on the ground floor are represented 'in a conservative manner in KENO as are the filled bulk storage hoppers.

These : analyses are supplemented by other KEN 0 ca culations for various arrays of filled bulk storage hoppers.

'The multiplication factors are well below 0.95 for the set of-conservative nominal conditions ano are acceptable for more' '

adverse cocditions.

A sumary of the assumptions errployed in the KENO model follows.

1 a)

Drawings D-5018-2001 (sheets 1 through 5) are used for dimensions 'of Ruilding 254 and the locations of the fixed equipment at the front-end of the pelletizing lines.

Drawing D-5018-8005 and D-5018-8011 are used to model the bulk storage hopper and the blenders, respectively.

See Figures 11.8.3-4 and 11.8.3-5.

License No. SNM-33, Docket 70-36 Revision:

0 Date:

08/18/89 Page:

II.8-11j.

e.

(

b)

The elements employed are U0,

water,

. concrete, 2

.poreformer, and lubricant; no credit' is taken -for scattering or parasitic. absorptions by structural materials in the building or eouipment.

c)

The floor, north, west and east walls of Building 254 are' taken to be 12 inches of ' ordinary concrete; the ceiling (35.5 feet) anc heat wall are represented as 12 inches of full density water.

d)

Fifty-four filled (29.375" ' I.D. ) bulk storage hoppers-(four are'on the unloader's) and six (47.25" I.D.) blenders

-are arranged as. illustrated in Figure 11.8.3-6; bulk storage hoppers are used ir.a ead of the recycle hoppers on the recycle hopper unloaders.

The two filled pneumatic transport lines are conservatively represented as a-15 inch cyHnder extending frcn floor to ceiling at the micronizer location. The vertical array of equipcent from the vacuum receiver on the third floor down to the rotary l

press on the ground floor is also represneted as a right L

cylinder of 15 inch diameter extending from floor to ceiling at the rotary press location.

l e)

All 09 regi ns contain UO having a density of 3.5 g/cc, 2

2 at an enrichment of 5 w/o U-235 and I w/o water.

In additien, two and one half times the maximum amount of-poreferner and lubricant are present in the U0 cylinder 2

representing the vertical pelletizing array.

Each bulk l

storage hcpper contains 1000 K; UO and each blender is g

assumed to contain 4200 Kg UO '

2 License No. SNM-33, Docket 70-36 Revision:

0 Date:

08/18/89 Page:

II.8-11k

____i___'_ _ _ _ _ _ _ _. _ _ _ _ _ _. _ _ _ _ _ _.. _ _ _

n.

]!

y L

l 1

f)

A significant franction of the bulk storage. hoppers are clustered' closer to the blenders than practical from an orderly access point of view so as to maximize the interaction between hoppers and blenders.

l l

g)

Thirteen ' inch slabs of U0 enriched to 5 w/o U-235 were 2

assumed on the second and third floors of the building.

The slabs contained 1 0 w/o water, 1.0 w/o starch, and 1.0 w/o zinc sterate.

The 13 inch slab conservatively represents buckets of UO that may be stored on these 2

floors.

The multiplication factor for the above set of conservative nominal conditions was 0.860 + 0.004.

KENO calculations are carried out for infinite and' finite array, of bulk storage hoppers to examine possible limitations on storage configurations.

The following assumptions are employed in the KENO models.

a)

Figure 11.8.3-4 shows the KEN 0 model for an individual hopper.

No structural materials are included.

b)

Hoppers are spaced on 30 inch centers.

c)

Each hopper is assumed to contain 1000 Kg UO. The 00 is 2

2 taken to be of 3.5 g/cc density, 5.0 w/o U-235, and I w/o water.

d)

The model employs a one foot thick ordinary concrete floor and a 12 inch water region at ceiling height (35.5 feet).

License No. SNM-33, Docket 70-36 Revision:

0 Date:

08/18/89 Page:

11.8-111 L______._

. :4. :

.fi

',l._'/~f j, J..

. 7(

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i

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b I

s.

Results'6f.the KENO calculations are as follows; L.e a).

An infinite planar array k = 0.833 + 0.004 b)

An infinite planar array'with

~ hoppers overfilled to 1378

~

Kg UO k = 0.867 1 0.004 2

f.

.c)

A.7 x 7. array of. bulk storage s

hoppers at 1000 Kg / hopper reflected by concrete walls k = 0.686.1 0.004 d).

Isolated hopper surrounded by a-one foot radial water reflector k = 0.571 1 0.003

~

u.

j, p.

License No. SNM-33, Docket 70-36 Revision:

0 Date: 08/18/39 Page:

II.8-11m i

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i figure 11.8.3-1 Bulk Storage Hopper

. License No. SNM-33, Docket 70-36 Revision:

0 Date: 08/18/89 Page: II.8-llo

"y.

'j 3.: r o :

a.-

, j.

't

=)

K 26.0 in

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l Figure II.8.3-2 Recycle Storage Hopper License No. SNM-33, Docket 70-36 Revision: 0 Date: 08/18/89 Page: II.8-llp x_:_-_____:-_______

1 s

i i

f i

K 48.0 in x

J Transport Dust Control l

Vacuum Ventilation Filter q

Iowback 7i;R

gr

_.e.

'~~~L-3rd Floor i

l c

f Sock Filters E

0xide Transport Line from Micronizer N \\ '==

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X

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.s y

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hi"* l

• Rotary Valve #

Powder Prep l

1 Drive Motor.

1 VV l

uilkk%%2&LMBBV&istBM72r72BfMB%k!&B9MannM i

Figure 11.8.3-3 0xide Blender License No. SNM-33, Docket 70-36 Revision: 0 Date: 08/18/89 Page: II.8 -11q

g

- +

o.

i T LI H

UO2 LEVEL (1000KG) 17.28" c

29.376"

=

V n

il i

I I

I I

l I

I l

I I

I l

1 l

1I I

23.69" l

l 1

l I

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1ll li STRUCTURE Ii 1

II I

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l 12" CONCR ETE Figure 11.8.3-4 KENO Model for Bulk Storage Hopper License No. SNM-33, Docket 70-36 Revision:

0 Date:

08/18/89 Page:

II.8-llr a-__-__--__

r'

??

i j

i.

.i l

I L 471/4" DI A.

CYLINDER 279 5/8" UO2 LEVEL 20.65" (4200Kg) y il 200 j

51.625" (CONICAL SECTION SUBDIVIDED INTO TWENTY (20) EQUAL HEIGHT REGIONS)

F h

9" DI A.+

60" CYLINDER II I

I jl I

l r ROTARY VALVE I

STAND I

(Not Modeled) l l

36 1/2" l

l 1r u

Figure 11.8.3 5 KENO Model for Oxide Blender

License No. Sht-33. Docket 70-36 Revision:

0 Date:

08/18/89 Page:

II.8-11s

d g

i JNet = 0 ejh 9.-

g g

OOO

@O OT b

12" WATER e

ASSUMED r

(

s CONC E B = BLENDER ASSUMED T = PNEUMATIC TRANSFER P = PELLETIZING EQUIPMENT Figure 11.8.3-6 KENO Model for Front End of Pellet Line (Northwest Corner of Building 254)

License No. SNM-33, Docket 70-36 Revision:

0 Date:

08/18/89 Page:

11. 8-1 I t