ML19343D576

Application to Amend License SNM-1067 to Allow Addl Storage of Finished Fuel Assemblies in Present Storage Room.Page Revisions to License Encl

ML19343D576
Person / Time
Site:	07001100
Issue date:	03/19/1981
From:	Lichtenberger ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY
To:	Page R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
18740, NUDOCS 8105050352
Download: ML19343D576 (29)

Text

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.i C-E Power Systems Tcl. 203/688-1911 g

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e Combustion Engineenng. Inc.

Telet 99297 1000 Prospect Hill Road Windsor, Connecticut 06095 1 POWER

% SYSTEMS March 19,1981 License No. SNM-1067 Docket 70-1100

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U. S. Nuclear Regulatory Commission Ss Washington, D. C.

20555 Q' y ff $UM L.

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2 Attention: Mr. R. G. Page, Acting Chief Uranium Fuel Licensing Branch a

Ai'R 2 I Y, -

Division of Fuel Cycle & Material Safety g,,,,,

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Dear Mr. Page:

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It is requested that License SNM-1067 be amended to allow additio of finished fuel assemblies in the present storage room. The distance between rows of fuel assemblies within any given double rack will remain at 35 inches center-to-center. The aisle between the double racks will be reduced from 45 inches center-to-center to 37 inches center-to-center to accommodate additional racks within the room. The capacity of all racks will then be doubled, decreasing the center-to-center spacing of fuel assemblies within the rows from the present 28 inches to the desired 14 inches.

Approval is requested in two parts. Approval to decrease the aisle spacing from 45 to 37 inches is needed as soon as possible to permit moving of the racks prior to April 1st. At this time, all shipping containers will be full and fuel assem-blies will have to be stored in the racks (at the present 28 inch ' center-to-center spacing within rows). Per our meeting with Mr. W. T. Crow and Mr. N. Ketzlach of your staff on March 17, 1981, it was agreed that this decrease in aisle spacing would result in only a nominal increase in reactivity of the storage arrangement, and that previously-generated NRC data on fuel assembly storage would confirm the criticality safety margin for decreasing the aisle spacing.

Approval to double the capacity of the racks by going to a 14 inch center-to-center spacing within rows is needed by May 1, 1981. At this time, the racks with 28 inch center-to-center spacing will be full and additional storage capacity will be needed. A criticality safety analysis using KENO-IV is included as part of this amendment application to show the variation of keff with various external water mist densities assumed. An acceptable criticality safety margin has been demon-strated for mist densities up to 4% and greater than 10%. A comprehensive analysis of mist densities achievable from the sprinkler system in the fuel storage room is included as part of this amendment request to demonstrate that the absolute maxi-mum mist density is less than 1%, assuming a 60 second fall time and overlapoing of 6 sprinkler patterns.

Fire fighting with water hoses is not permitted in the area.

Even if a mist density between 4% and 10", was achieved with a fire hose, the fuel area affected would be insufficient to cause the reactivity of the array to increase significaatly.

Thus, the assembly storage room has been shown to be safe for all credible water mist densities.

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It is requested that the following page changes to License SNM-1067 be approved:

Add Page Delete Page C-25, Rev. 1, dated 3/19/81 C-25, Rev. O, dated 3/22/79 C-26, Rev. 2, dated 3/19/81 C-26, Rev. 1, dated 7/16/79 C-26a,Rev. O, dated 3/19/81 C-27, Rev. 1, dated 3/19/81 C-27, Rev. O, dated 3/22/79 D-27, Rev. 1, dated 3/19/81 0-27, Rev. O, dated 3/22/79 D-28, Rev. 1, dated 3/19/81 0-28, Rev. O, dated 3/22/79 D-29, Rev. 1, dated 3/19/81 0-29, Rev. O, dated 3/22/79 D-51 through D-70 inclusive, Rev. O, dated 3/19/81 The requested changes are considered to be a minor amendment as defined in 10 CFR 170.31 and the required application fee of $1400. has been sent directly to the License Fee Management Branch under separate cover.

If you have any questions concerning this amendnent application, please contact Mr. G. J. Bakevich of my staff.

Very truly yours, H. V. Lichtenberger Vice President-Nuclear Fuel Nuclear Power Systems-Manufacturing HVL/GJB/ssb l

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Enclosures r

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2) All rod boxes were assumed to be filled to capacity at maximum enrichment (4.1wt.%U235). The smallest diameter rods (0.382 inch) were used to obtain maximum fuel loading. The Zr-4 cladding (0.025 inch thickness) was homogenized with the fuel.

3) All steel construction material was neglected.

4) Variable density external water mist was introduced to determine peak reac-tivity of the system under optimum conditions.

The sixteen group Hansen-Roach cross sections were used in KENO-IV to determine reactivity of the system under the conditions noted above. The highest k,ff of 0.8886 2 0.0070 was obtained at an external mist density of 0.06 gm H 0/cc.

2 Dimensional details of the calculational model and results obtained are presented I

in Section 1.10 of the demonstration section of this license.

8.6 Fuel Assembly Fabrication Fuel rods are loaded into the assembly skeleton in a fixture which provides a lubricating water spray (W.S. 123,124). These fixtures are designed to assure that water cannot be retained. Nevertheless, safety for this operation has been established with full moderation and reflection. The criticality safety calcu-1ations for a fully reflected fuel assembly are presented as part of the criti-cality safety analysis of the Fuel Assembly Storage Area in Section 8.7.

A maxi-mum k f 0.9291 0.0089 was obtained for a 19 x 25 array of flooded assemblies.

eff Details of the analysis are discussed in the following section.

l 8.7 In-Plant Storage of Fuel Assemblies Fuel assemblies are stored in a vertical position using racks (W.S.130) of ade-quate strength to preclude loss of the design spacing. The assemblies in the storage positions only shall be wrapped with polyethylene with the bottom ends open to assure free drainage. There are 339 storage positions and an adjacent inspection area consisting of 4 positions. Within the same room, (but at greater separation distances) there are two horizontal loading tables (W.S. 123 & 124 where the fuel rods are initially loaded into the assembly skeletons, a vertical i

Licerise No. SNM-1067 Docket 70-1100 Revision:

1 Da;e: 3/19/81 l

Page: C-25

wash tank (W.S. 132) where the assemblies receive a final demineralized water rinse, two fixed vertical inspection stands equipped with elevator platforms (W.S.131 and 133) to allow final Q.C. dimensional checks, and a marked floor area where the assemblies are loaded into shipping containers prior to outdoor storage.

Each of these stations is physically limited to one fuel assembly ex-cept the shipping container which holds two. The assembly storage room can thus o

contain a maximum of 350 fuel assemblies, 339 storage positions, plus 11 additional

^

locations). All assemblies outside of shipping containers whall be stored ver-tically within the design spacing criteria of the Assembly Storage Room shown on Drawing NFM-E-4229. Revision 0, dated 3/19/81.

1) A 19 x 25 array of assemblies was modeled at a 14 inch center-to-center spacing of fuel assemblies within the double rows. The distance between rows of fuel assemblies within any given double rack is 35 inches center-to-center while the aisle between the double racks is 37 inches (center-to-center). This calculational array effectively brings the 11 additional assemblies closer to-gether and provides greater interaction with the 339 assemblies in the storage area than is actually possible. The calculational array thus contains 475 assemblies while the maximum number in the room is limited to 350,

2) All steel construction material was neglected.

3) Variable density water mist was introduced within and between the assemblies to determine the reactivity of the system under various degrees of water moderation.

4) Four group cross sections were generated using the CEPAK Code for the 3 regions of the assemblies:

fuel, water holes, and external water mist between assemblies.

These 3 regions were then smeared over the entire array using the DOT Code to obtain one set of four group flux-weighted lattice cross sections.

5) Four group cross sections were also generated using the CEPAK Code for the 8" concrete walls,16" concrete floor, and the external water mist between the top of the fuel assemblies and the ceiling and walls. The ceiling was considered to be 8 inch thick concrete, though 4 inches is usually assumed.

License No. SNM-1067, Occket 70-1100 Revision:

2 Date: 3/19/81 Page: C-26

9 The 4 group cross section sets described above were then used in KENO-IV to determine the reactivity of the fuel assembly storage area under the above noted conditions for the most reactive assemblies (the 16 x 16 type).

Dimensional details of the calculational model and results obtained are shown in detail in Section 1.11 of the demonstration section of this license.

The analysis indicates that the margin of criticality safety is acceptable for water mist densities up to.04 gm/cc, (keff = 0.9454 t 0.0033) which is greater than that attainable from the assembly room sprinkler system.

(See pages D-51 through D-70 of the demonstration section of this license). The array was also shown to be safe for water mist densities greater than.10 gm/cc (k,ff = 09452 !

0.0027) and for full density water moderation (k,ff = 0.9291 0.0089).

The local fire departments have been instructed to use only dry chemical extinguishing methods in the fuel assembly storage room and the pellet shop.

Signs restricting fire fighting in this area to dry chemical methods only have been posted at each entrance to the assembly storage room. There is only one vehicle access gate to the fuel fabrication facility which is controlled by a security guard 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> a day. He has instructions to prohibit firemen from using fire hoses in the above described restricted areas. Thus, criticality safety is assured under all credible conditions of moderation.

License No. SNM-1057, Docket 70-1100 Revision:

0 Date: 3/19/81 Page: C-26a

8.8 Shipping Container Storage 3 hipping containers (Models 927Al and 927C1), each containing two fuel assemblies, are stored outdoors in arrays up to three high. The width and length will vary; thus, the quantity of containers is limited only by the width and length of the space allocated for storage. The con-

. tainers are stored on a pavement or blacktop surface. The steel ship-ping container, approximately 3 feet in diameter and up to 217" long, houses two fuel bundles of the types previously described in this license. The two bundles in each container are separated by six inches.

An eight foot hign chain link fence encloses the storage area, and all stored fuel is within 100 feet of a criticality alarm detector. Con-tainers are separated by at least 20 feet from any other fissile material.

Criticality Safety Analysis The following conservative assumptions were incorporated into the calcula-tional model of the shipping container storage area:

235

1) The fuel assemblies are assumed to be made of 4.1 wt.% U enriched UO with no poison shims. The most reactive assemblies (the 16 x 16 2

design) were used.

2) The three high double infinite array of shipping containers was assumed to be reflected by 4 inches of concrete above and 16 inches of concrete underneath, with a 25 foot separation distance between the two reflectors.

License No. SNM-1067, Docket 70-1100 Revision: 1 Date: 3/19/81 Page: C-27

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THIS PAGE INTENTIONALLY LEFT BLANK License No. SNM-1067, Docket 70-1100 Revision:

1 Date: 3/19/81 Page: D-29

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Maximum Moderator Censity in Air From Automatic Sprinklers Installed in Assembly Room, Building No. 17 1

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a License No. SNM-1067, Docket 70-1100 Revision: 0 Date:

3/19/81 Paae: 0-51

2.-. -...

Combustien Engineering Windscr, CT ANI File No. N-6 The following is preser.ted to demonstrate the maximum sprinkler water discharge density which may be anticipated in the Assembly Room of Building No. 17 at the Windsor facility.

Individual, multiple, and total discharge rates are presented. The maximum density of water in air is also presented. The water / air ratio is demonstrated to remain below the moderation limits to preclude criticality as set by separate calculation 3.

I l

t License No. SNii-1067, Docket 70-1100 Revision:

0 Date: 3/19/81 Page: D-52 l

. + -

Combustion Engineering Windsor, CT ANI File No. N-6 One Head Discharge Flow Discharge is calculated for the hydraulically least remote sprir.kler head located on 1-1/4" branch line off the 3" cross main at the Southwest of Assembly Room.

Assume'no friction loss in pipes.

Assume pump operating at " churn" pressure of 120 psi.

Head is operating at 120 psi.

Q = k W, where k2 5.6 1-Q = 5.6VTf6 Q = 61.34 GPM 3

3 Q = 61.34 GPM X 1 FT 8.2 FT 7.481 GAL MIN

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4 Discharge Volume The volume of the discharge from a standard sprinkler is that of a parabolic solid.

For a paraboloid, 2

2.

V = 1/2 T[ r h In the Assembly Room, sprinkler height is 28 ft.,.*. h r 28 it.

For 1/2" Standard Spray Sprinkler Heads 0120 psi o 28 ft.

Radius at floor = 12 ft.,.*. r = 12 ft.

Then:

V = 1/2. TT- (12)2. 28 V = 6333.45 FT3 License No. SNft-1067, Docket 70-1100 Revision: 0 Date:

3/19/81 Page: 0-53

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s Discharge Distribution In a vacuum, water discharge from a sprinkler head will accellerate to the floor at the rate of 32 ft./sec.2 Actual terminal velocities of sprinkler droplets in air at 70 F. have been measured to be 15-20 ft./sec. 3.

0 Therefore, any discrete particle of water would reach the floor within approximately two seconds. Allowing for exceptional air drag on the water droplets as well as for any unaccountable air currents, let us assume that water discharge takes a full minute to traverse the 28 ft. distance from the sprinkler deflector to the floor, a grossly conservative assumption. There-fore, at any instant in time, a full minute's discharge of water may be assumed to be suspended within the discharge paraboloid, or 8.2 ft.3 of water.

We will further assume that rather than discrete droplets of water, we have an infinitely fine mist of water; another conservative assumption from the criticality stanopeint.

(Actual drop diameters have been measured by freezing methods, photographic methods, and laser optical array imaging methods.

Standard spray head droplet size at 60 psi is in the range of 0.4 mm to 1 m and becomes increasingly small as pressure increases (d.( 1 )).

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Additionally, the standard spray sprinkler head, by design, has a uniform radial water discharge pattern. 'Further increasing the uniformity of the water / air mixture within the discharge paraboloid, is a large amount of i

air entrainment within the spray. The air entrainment rate at 3 meters below a' standard 1/2 inch sprinkler head operating at as little as 28 psi is about 30,000 CFM.

i Water / Air Density i

The water / air density of the single sprinkler head under the above conditions is as follows:

License No. SNM-1067, Docket 70-1100 Revision: 0 Date:

3/19/81 i

Page: D-5t Mw aM

d Vole 2 of Water Discharged Il = Volume of Discharge Paraboloid 3

fl=8.2FT 6333.4 fy=0.00129=0.13%

This density of water in air is well within the tolerable moderation i

limits demonstrated in the criticality calculations for the Assembly Room at Combustion Engineering.

Multiple Head Discharge Automatic sprinkler systems are typically layed-out to provide ourlapping areas of protection by sprinkler head discharge. The sprinkler system in the Assembly Room at Combustion Engineering is no exception. See attached drawing l

showing actual sprinkler arrangement for the Assembly Roon> upon which 12 ft.

l radius circles have been circumscribed representing sprinkler discharge patterns as per the above.

Even assuming fully elastic splashing of water discharge off walls (an extremely conservative assumption), it is shown that a maximum of six such discharge circles (or segments of circles) overlap.

For simplicity, we will assume that all sprinkler heads will discharge at the same maximum rate as previously calculated for the single sprinkler head.

(This,again, is a very conservative assumption as there are a number of mechanisms which rapidly reduce individual sprinkler discharge rate as the number of discharging sprinklers increases.) Based upon all of the above, the maximum water / air density at any point in the room would be six times the density frcrn the discharge from a single sprinkler head.

License No. SNft-1067, Docket 70-1100 Revision: 0 Date:

3/19/81 Page: D-55

f=6f

=6-(0.00129) g 3

f = 0.00774 = 0.77% --

6 Once again, the moderator density has been demonstrated to be well within the tolerable limits.

The following calculations are included to demonstrate that the actual sprinkler discharge rate with all sprinkler heads operating in the Assembiy Room v'11 always be less than those values previously calculated.

See attached drawing entitled " Hydraulic Reference Points".

Water Film Thickness-In addition to automatic sprinkler water suspended in the air,

-it is recognized that some of the water discharge will impinge on the i

fuel elements coating them with droplets, or in the worst case, a film of water.

Fire protection research into the ability of water discharged from automatic sprinklers to provide a coating over surfaces upon which the discharge has been performed by the Factory Mutual System. The maximum film thickness achieved in the research while discharging plain water at a rate of 0.50 gallons per minute was approximately 0.55 mm.

Based on this information, it is expected that the thickness of the coating of sprinkler discharge water on the fuel elements at Combustion Engineering will not exceed the above amount.

Leakage from Sprinkler System It is a comroonly held, although unfounded, fear that automatic wet-pipe sprinkler systems are subject to frequent leakage.

It is a fact that the License No. SNM-1067, Docket 70-1100 Revision:

0 Date:

3/19/81 Page: D-56

,,w

l National Fire Protection Association has estimated, based on sprinkler leakage loss reports, the probability that a sprinkler may open accidentally is less than one in 10, 6, 6

There are a number of reasons for the outstanding record of non-leakage from automatic sprinkler systems. The sprinkler heads themselves are produced under a strong quality program. Underwriters Laboratory requires testing of the devices for load on the heat responsive element, hydrostatic leakage, thirty day leakage, leakage under water hamer, load on the frame, ten and thirty day corrosion tests, stress-corrosion cracking tests, vibrational tests, impact resistance tests, and heat rr.sponse tests.4

• The system is I

designed in strict conformance with the ANSI /NFPA Standard for Sprinkler Systems.

The completed system at Combustion Engineering has been hydrostatically tested at 200 psi for a period of two hours. All fire protection systems at Combustion Engineering are periodically inspected and are carefully maintained.

It is highly remote that sprinkler leakage will occur in the Assembly Room.

However, if it is deemed necessary to further reduce the probability of accidental water discharge from the sprinkler system in the Assembly Room, this could be accomplished by converting the existing " wet-pipe" system, in which there is water under pressure constantly in the piping system, to what is known as a " pre-actiori" system, in which there is no water normally in the piping.

A pre-action sprinkler system utilizes the same closed sprinkler heads with fusible elements and the same piping distribution system as the standard wet-pip.e system. Rather than water in the piping system to the sprinkler heads, the pipes are filled with dry air or nitrogen at atmospheric or, preferably,

.slightly elevated pressure. By maintaining a slightly positive gas pressure on the piping system, the system can be supervised to sound an alarm if there License No. SNM-1067, Docket 70-1100 Revision: 0 Date:

3/19/81 Page: 0-57

should be any leakage from the system. Even if ther,e should be leakage of the supervisory gas, no water would flow. The pre-action system is equipped with a normally-closed, automatic valve which will not open upon a pipe-break nor upon operation of a sprinkler head.

Opening of the va'ive is controlled by an entirely separate smoke or heat detection system.

In the event of a i

fire, both an automatic sprinkler and a smoke or heat detector will be actuated and water will be discharged on the fire.

In the event of inadvertent actuation of a detector, the normally-closed valve would open but no water j

l would discharge since the piping system, including sprinkler heads, remains closed.

In the event of accidental failure of the piping system, no water will discharge since the normally-closed control valve will remain closed unless the detection system is also actuated by a fire or simultaneous failure of both the piping system and the detection system is considered to be extremely remote. Separate electronic or electro-pneumatic supervision of both the piping and detection systems further reduces the probability of accidental water discharge under non-fire conditions to an extremely low number.

i i

f License No. SNf1-1067, Docket 70-1100 Revision: 0 Date: 3/19/81 Page:

D-58 l

l 1

References 1.

Installation of Sprinkler Systems, ANSI /NFPA Standard No. 13, 1978 National Fire Protection Association.

2.

Baumeister, T., Editor, Marks' Standard Handbook for Mechanical Engineers, McGraw-Hill Book Company,1978.

3.

Yao, C., " Application of Sprinkler Technology", Workshop on Engineering

. Application of Fire Technology National Bureau of Standards / Society of Fire Protect ~on Engineers, 1980.

4.

Automatic Sprinklers for Fire-Protection Service, U.L. Standard No.199, Sixth Edition, Underwriters Laboratories.

5.

Dean, R.K., " Final Report - Comparison of Gel and Water as Suppressors of Radiant Ignition on Vertical Surfaces, Ablative Water Management and Liaison Groups, Factory Mutual Research Corporation, August 7,1972.

6.

McKinnon, G., Editor, Fire Protection Handbook - Fourteenth Edition, National Fire Protection Association,1976.

License No. Snit-1067, Docket 70-1100 Revision:

0 Date:

3/19/81 Page: D-59

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LOSS P.S.I.

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_4 L License fio. SNft-1067, Docket 70-1100 Revision: 0 Date:

3/19/81 Page: C-70

.