ML20207P230
| ML20207P230 | |
| Person / Time | |
|---|---|
| Site: | 07001100 |
| Issue date: | 12/17/1986 |
| From: | Lichtenberger ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY |
| To: | Crow W NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 27708, NUDOCS 8701150268 | |
| Download: ML20207P230 (44) | |
Text
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3 RETURN IO. 396-SS sy'%f nr.c::r!G OY Uf{S 5
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m m asar RECENED yk d1 SOMBUSTION ENENIEERNIE 5
UEC 231986 E License SNM-1067 c) U.S.NuflDR R!GULAICRY -f Docket 70-1100 EC"rmcit
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December 17, 1986 g
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W U.S. Nuclear Regulatory Commission f
Boc!qTro Washington, DC 20555 vs q '
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Attention:
Mr. W. T. Crowe, Acting Chief
- 2 g
,,,', ySCCDcq (12 Uranium Fuel Licensing Branch s
J Division of Fuel Cycle and Material q'h?WCLQg
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Subject:
SNM-1067 AmcunUFec C# "ryk(9. :/4..
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Dear Mr. Crowe:
Lu CL....icc'd..M 2....
e'/addilidas. b n mado to the subject license The following page chant s
nesearch Corporation regarding to reflect new input frc m i:m Nuvo autuai mist density calculations and their effect on Keff.
PAGE NO.
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DATE PAGE NO.
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12/05/86 Power Systems 1000 Prospect Hdi Road (203) 688-1911 Combustion En0ineenng, Inc.
Post Offico Box 500 Telex: 99297 Wn6 t Connectcut 06095 0500 8701150268 861217 PDR ADOCK 07001100 g27(([
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U,' S Nuciccr R:guintery C:mmiczion Licents SNM-1067 Mr. W. T. Crowa Dockst 70-1100 DELETE PAGE ADD PAGE PAGE NO.
REV.
DATE PAGE NO.
REV.
DATE II.8-79 1
12/05/86-II.8-80 1
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12/05/86 Please note that a license change fee, as required by 10 CFR 170.31, has been sent directly to the License Fee Management Branch under separate cover.
Very truly yours, 0
tk H. V. Lichtenberger Vice President,_ Nuclear Fuel HVL/ sam i
Enclosure l
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Section 8.7 COMBUSTION ENGINEERING, INC.
Windsor, Connecticut AN ESTIMATION OF THE WATER VOLUME FRACTION PROVIDED IN THE ASSEMBLY ROOM OF BUILDING NO. 17, WINDSOR FACILITY, COMBUSTION ENGINEERING, INC.
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License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-79 L
7 e
TACTORY MUTUAL RESEARCH CORPORATION S2148.93 ABSTRACT A method is described for estimating the water volume fraction (water discharge density) provided by automatic sprinklera in the Assembly Room of tuilding 17 at the Windsor facility of Combustion Engineering, Inc.
Water volume fraction in three selected regions in the Assembly Room were evaluated separately.
The volume fraction was estimated to be about 0.0075% of the space volume in the three selected regions.
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License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-80
=
9 FACTORY MUTUAL RESEARCH CORPORATION S2148.93 The objective of this project was to estimate the water volume fraction in air which can be provided by the sprinkler system in the A2sembly Room of Building 17 at the Windsor facility of Combustion Engineering,.Inc.
1.
SCOPE OF ESTIMATION The estimation was performed exclusively for the sprinkler systems and room configuration shown in Figure 1.
The sprinkler system in Figure 1 is in conformance with the NFPA Standard for Sprinkler Systems.
The system was installed according to the pipe schedule for ordinary hazard occupancy.
The water volume fraction in air was estimated separately for Regions A, B, and C indicated in Figure 1.
These regions are delineated by the walls and dashed lines shown in the figure.
2 ASSUMPTIONS OF ESTIMATION The estimation was based on the following assumption:
1)
Both the diesel and electrical pumps are running to provide sprinkler water.
2)
The vertical distance from the base of the riser at Building 17 to the elevation of the sprinklers is about 27 ft, which is equivalent to an elevation head difference of 11.7 psi.
3)
The water discharge rate in a region of interest can be obtained
.from the water supply test data of Building 17 in conjunction with the Factory Mutual Pipe Schedule Sprinkler System Demand Tables (1).
4)
The pressure drop due to friction loss from the top of the riser to the region of interest can be estimated from the Factory Mutual Pipe Friction Loss Tables (2).
5)
Water drops are homogeneously distributed in the air of the region of interest.
License No. SNM-IC67, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-81
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FIGURE 1 SCHEMATIC OF SPP.INKLER SYSTEM AND ROOM CONFIGURATION OF THE ASSEMBLY ROOM IN BUILDING NO. 17, WINDSOR FACILITY, COMBUSTION ENGINEERING, INC.
License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-82
4 4
FACTORY MUTUAL RESEARCH CORPORATION S2148.93 3.
PROCEDURE OF ESTIMATION The procedure used to estimate the water volume fraction in air is dascribed sequentially as follows:
1)
Obtain the tabulated water discharge rate from a sprinkler system at the tabulated water pressure at the starting point of the system from the Factory Mutual Pipe Schedule Sprinkler System Demand Tables.
In the tables, water discharge rates and water pressures are tabulated such that the water pressure at the end sprinkler in the branch line is 5 psi.
2)
Calculate the actual water discharge rate and the corresponding water pressure from the tabulated values obtained in Procedure 1, based on the water supply test data foy Building 17 (see Figurr 2).
For water densities of 0.2 gpm/ft and above, the actual water discharge rate (0 ) and water pressure (P ) are related to 2
2 the tabulated water discharge rate (Q ) and water pressure (P )
y y
by (0 /0 I
/P (l) 1 2
1 2
The water pressure drop due to friction loss from the top of the riser to the region of interest is obtained from the Factory Mutual Pipe Friction Loss Tables.
3)
Approximate the actual water pressure at the end sprinkler in the branch line using Eq. (1).
Since the water pressure at the end sprinkler is 5 psi in the tables, the actual water pressure is 2 = 5(Q /Q )l.85 (2)
P 2
1 4)
Take the average of the water pressure at the starting point of the system of interest and the water pressure at the end sprinkler as the average water pressure of the system.
5)
Estimate the volumetric median drop size at the average water pressure of the system.
6)
Calculate the water volume fraction in air for the region of interest based on the water discharge rate, space volume in the region, and average vertical downward velocity.of the water drops of median size.
Use the equation:
Water Vol. Frac. = (Water Dis. Rate) (Time For Drop to Go From Ceil / Floor)
Space Vol. In Region Below Sprinklers License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-83
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License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-84
FACTORY MUTUAL RESEARCH CORPORATION S2148.93 4.
CALCULATIONS The estimation of water volume fraction in air was performed Ceparately for Regions A, B,
and C shown in Figure 1.
The following calculation procedures for each region are identified by numbers in cccordance with those of Section 3.
Region A 1)
From the Factory Mutual Pipe Schedule Sprinkler System Demand Tables for Ordinary Hazard Occupancey, we obtain:
tabulated water discharge rate:
185 gpm tabulated water pressure:
17 end sprinkler pressure:
5 psi.
2)
Actual water discharge rate = 446 gpm Actual water pressure (446 gpm/185 gpm)l.85 (17 psi) x
=
= 86.6 psi.
Fressure drop along 80 ft (from a to c in Figure 1) of 3-in. pipe (0.219 psi /ft) x (80 ft)
=
= 17.5 psi.
Water pressure at the base of the riser
= 86.6 psi + 17.5 psi + 11.7 psi
=115.8 psi.
This pressure agrees with the water supply test data for Building 17 in Figure 2.
3)
Actual water pressure at the end sprinkler is 1.85 P=
(5 psi) (446 gpm/185 gpm)
= 25.5 psi.
4)
Average water pressure in Region A (86.6 psi + 25.5 psi) /2
=
= 56.1 psi.
License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-85
FACTORY MUTUAL RESEARCH CORPORATION S2148.93 5)
For 1/2-in. sprinklers, the volumetric median drop size at 30 psi is about 0.86 mm (3).
Since the median drop size is inversely proportional to the one-third power of water pressure, the median drop size at 56.1 psi is (0.86 mm) (30 psi /56.1 psi)1/3
=
= 0.70 mm.
6)
The downward drop velocity is about 11.5 ft/s for drops of 0.7 mm in diameter (3).
The time needed for 0.7-mm drops to fall from the sprinkler to the floor
= 27 ft/ll.5 ft/s
= 2.35 s.
(446) (0.039) (0.13368)
Therefore, the water =
x 100 volume fraction (27) (30) (39)
= 0.0074%
Region B 1)
From the tables, obtain:
Tabulated water discharge rate = 185 gpm Tabulated water pressure = 17 psi End sprinkler pressure = 5 psi.
2)
Actual water discharge rate = 467 gpm Actual water pressure = 17 (467/185)1*0 psi
= 94.3 psi.
Pressure drop along 40 ft (from a to b in Figure 1) of a 3-in. pipe
= 0.238 x 40 psi
= 9.50 psi Water pressure at the base of the riser
= 94.3 + 9.50 + 11.7 psi
= 115.5 psi.
This agrees with the water supply test data for Building 17.
3)
Actual water pressure at the end sprinkler
=5 (467/185)l.85 psi
= 27.7 psi.
License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-86
i FACTORY MUTUAL RESEARCH CORPORATION S2148.93 4)
Average water pressure in Region B (94.3 + 27.7) /2 psi
=
= 61 psi.
5)
Median drop size at 61 psi
= 0.86 (30/61)/13 psi
= 0.68 mm.
6)
The downward velocity for water drops of 0.68 mm is about 11.5 ft/s.
The time needed for 0.68-mm water drops falling from the sprinkler to the floor
= 27/11.5 s
= 2.35 s.
The water volume fraction = (467) (0.039)
(0.13368) x 100 (27) (30) (40)
= 0.0075%.
Region C 1)
From the tables, obtain:
Tabulated water discharge rate = 400 gpm Tabulated water pressure = 17 psi End sprinkler pressure = 5 psi.
2)
Actual water discharge rate = 992 gpf*85 Actual water pressure = 17 (992/400) psi
=91.2 psi.
Assume pressure drop sue to friction loss from the base of riser to Region C can be neglected.
j Water pressure at the base of the riser
= 91.2 + 11.7 psi
= 102.9 psi This agrees with the water supply test data for Building 17.
3)
Actual water pressure at the end sprinkler
=5 (992/400)l.85 psi
= 26.8 psi.
r I
License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-87
FACTORY MUTUAL RESEARCH CORPORATION S2148.93 4)
Average water pressure in Region C
' (91.2 + 26.8) /2 psi
=
= 59 psi 5)
Median drop size at 59 psi
= 0.86 (30/59)l/3,,
= 0.69 mm.
6)
.The downward velocity for water drop of 0.69 mm is about 11.5 ft/s.
The time needed for 0.69 mm water drops falling from the sprinkler to the floor
= 27/11.5 s
= 2.35 s.
(992) (0.039) (0.13368)
The water volume fraction =
x 100 (27) (64) (40)
= 0.0075%.
SUMMARY
The water volume fractions in Regions A, B and C in the Assembly Room of Building 17 (see Figure 1) were estimated separately based on the sprinkler system and room configuration illustrated in Figure 1, and the water supply test data shown in Figure 2.
The estimated water volume fractions in air in the above three regions are about 0.0075%.
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License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-88 l
l
FACTORY MUTUAL RESEARCH CORPORATION S2148.93 1)
Pipe schedule sprinkler system demand tables, Loss Prevention Data Sheets 2-76, The Factory Mutual System.
2)
Pipe friction loss tables, Loss Prevention Data Sheets 2-89, The Factory Mutual System.
3)
You, H.
Z.,
" Sprinkler Drop-Size Measurements, Part II: An Investigation of the Spray Patterns of Selected Commercial Sprinklers with the FMRC PMS Droplet Measuring System," FMRC Technical Report, J.I. OGIE7.RA, 1983, t
l License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-89
O:
SECTION 8.8 COMBUSTION ENGINEERING, INC.
WINDSOR, CONNECTICUT AN ESTIMATION OF THE WATER FILM THICKNESS ON FUEL RODS (IN FUEL BUNDLES) DURING A RELEASE OF WATER FROM THE SPRINKLER SYSTEM.
1 h
i License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-90
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INTRODUCTION The following are the calculations used to determine water film thickness en fuel rods (in fuel bundles) in storage when the storage room sprinkler system is activated.
The following assumptions have been made:
- No effect due to grids in the fuel bundles
- All water drops falling on the fuel bundle accumulate at the top of the fuel bundles and flow along the fuel rod surfaces.
- Water distribution is uniform in the fuel bundle.
BASIC INFORMATION Fuel Arrangement (Geometry)
Fuel O.D.
0.382 inches
=
Fuel Pitch =
0.506 inches Flow Rate For Region B of the storage room = 467 gal / min. (See Section 8.7) 2 Area of storage room
= 30 x 40
= 1200 ft Physical Properties at 14.7 psia and 77 F 3
Water Density Q
= 62.3 lb/ft
-5 Water Viscosity f(
= 2.0 x 10 lb
-sec/ft i
F l
at 14.7 psia and 50 F 3
Water Density (
= 62.3 lb/ft
-5 2
Water Viscosity (( = 2.73 x 10 lb
-sec/ft p
Area of A Single Fuel Lattice
= (0.506) 2/144
=
0.00178 ft2 L
A i
License No. SNM-1067, Docket 70-1100 Rev.1 Date: 12/5/86 Page:
II.8-91
Clad Perimeter Of A Single Fuel Lattice t.= 0.382
= 0.1 ft 12 Water Flow Rate Per Fuel Lattice
-6 3
467 GPM x 0.13368 FT x 0. 00178 FT - = 1.54 x 10 FT 60 Gil 1200 FT4 Sec Formula For Film Thickness For this calculation references 1 and 2 are used.
l/3 n ear _h1/3 0
( ~p2 p where 6
film thickness (ft) viscosity (LB -sec/FT )
p f
T :
mass flow rate per unit of rod circumference (LB/ft sec) p density (LB/ft )
~.-..
p:
acceleration by gravity (ft/sec )
conversion factor Film Thickness Calculation at 14.7 psia and 77"F
-6 3
~4 T = 1.54 x 10 FT x 62.3 LB
= 9.6 x 10 g
3 Sec FT FT-Sec 0.1 FT L - EC
-4 x32.2hC and 6 =
x 2.0 x 10 x 9.6 x 10 2
-SEC FT (62.3)2 3x32.2hC 2
= 0.00025 FT 0.00295 inches = 0.0075 CM
=
l License No. SNM-1067, Docket 70-1100 Rev. 1 DATE: 12/5/86 Page: II.8-92
at 14.7 pais and 50*F
-4
-6 hh-SEC x62.3hh3 9.6 x 10 T = 1.54 x 10
=
0.1 FT 1/3
-5 LB-SEC EI and 6=
3 x 2.73 x 10 x 9.6 x 10-4 LE!
x 32.2 2
FT2 FT-SEC SEC (62.3)2 2
x 32.2 2
5EC 0.00027 FT = 0.0033 inches = 0.0083 CM
=
Discussion The above approach is based on laminar film flow and derived theoretically.
A more comprehensive approach considering turbulent flow was presented by Dukler (Ref. 3).
Dukler shows, in Reference 3, that his approach gives
>w--,_,.t gi,1,ar film thicknesses as the Nusselt approach (Ref. 1) at zero shear i
_ 'W om.,,
stress at the film /mir interface and low Reynolds numbers (less than 300).
For the present case, the Reynolds number is:
Re = 4T U
-4hh-SEC
5.9 Re
4 x 9.6 x 10
-5 LB-SEC EI 2.0 x 10 x 32.2 2
FT2 SEQ
\\
Therefore, it is concluded that the Nussielt approach is a reasonable one.
References 1.
Nusselt, W.,
ZVDI 60, 541 and 569 (1916) 2.
- Bird, R.
B.,
etal, TRANSPORT PHENOMENA, Wiley & Sons, Inc.,
N.Y.
(1960) 3.
Dukler, A.
E.,
Chemical Engineering Progress SYMP Series No. 30, Vol. 56, Page 1 (1960)
License No. SNM-1067, Docket 70-1100 Rev. 1 Date:
12/5/86 Page:
II.8-93
s
=
4.2.4 Safety Margins - Individunl Units - Safety margins applied to units calculated to be critical (with up to 2% uncertainty),
and incorporated in the SIU's shall be as follows:
Mass 2.3 Volume 1.3 Cylinder Diameter 1.1 Slab Thickness 1.2 These values shall be further reduced where necessary to assure maximum fraction critical values of 0.4 for geometrically limited units, and 0.3 for mass limited units (based on optimum water moderation).
An additional reduction has been applied to several mass and volume limits to assure that spacing requirements remain constant for all enrichments.
For validated computer calculations, the highest K eff for a single unit or array shall be 0.95 including a 2-sigma statistical uncertainty and including all applicable uncertainties and bias.
A maximum Keff of 0.95 with the above described uncertainties shall apply for calculations performed for a mist condition.
o The basic assumptions used in establishing safe parameters for l
single units and arrays shall be as follows:
The possibility of accumulation of fissile materials in inaccessible locations shall be minimized.
Nuclear safety shall be independent of the degree of moderation within the process unit when addition of i
f moderating materials is considered to be credible.
Nuclear safety shall be independent of the degree of i
License No. SNM-1067, Docket 70-1100 Rev.3 Date: 12/5/86 Page: I.4-6
=
yy, _
c.
moderation between units up to the maximum credible mist density of 0.1% H2O (.001 gm H20/cc) as demonstrated in sections 7.2.1 and 8.7.
Criteria used.in~the' choice of fire protection in areas of potential criticality accidents (when moderators are present) shall be justified.
Nuclear safety shall be independent of neutron reflector thickness for the reflector of interest.
Optimum conditions (limiting case) of water moderation and heterogeneity credible for the system shall be determined in all calculations, i
The analytical method (s) used for criticality safety analysis and the source of validation for the method (s) shall be specified.
Safety margins for individual units and arrays shall be based on accident conditions such as flooding, multiple batching, and fire.
The method of deriving applicable multiplication factors 4
shall be specified.
t License No. SNM-1067, Docket 70-1100 Rev.3 Date: 12/05/86 Page: I.4-7 5
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0 1)
A 19 x 34 array of assemblies was conservatively c
modeled at a 9.75 inch center-to-center spacing of fuel assemblies within the double rows. The actual average o
minimum center to center distance within the fuel storage racks is 10 inches.
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 25 additional assemblies closer together and provides greater interaction with the 440 assemblies in the storage area than is actually possible.
The calculational array thus contains 646 assemblies while the maximum number in the room is limited to 465.
2)
All steel construction material was neglected.
3)
The water mist density has been calculated to be 0.000075 grams per cubic centimeter (see section 8.7).
For conservatism a water-mist density of 0.001 grams per cubic centimeter was assumed to be in and around the fuel assemblies in the storage array. (This is a factor of about 13 times higher than the calculated mist density).
A uniform water film thickness of 0.083 millimeters was assumed on the fuel assembly surface (see section 8.8).
This film thickness is for 50 F water, while the minimum ambient temperature is actually higher.
4)
One hundred twenty three (123) DLC-16 energy group cross sections were used to calculate the reactivity for an infinite fuel storage array using KENO.
The 123 License No. SNM-1067, Docket 70-1100 Rev.3 Date: 12/5/86 Page:
II.8-27
group was es11cp32d to 16 grcup3 using XSDRNPM cnd tha racctivity calculatcd for an infinito funl otoraga erroy.
The resultant reactivities were 1.00158 1 0.00608 and 1.00074 1 0.00569 for the 123 and 16 groups, respectively.
Since the reactivities are essentially the same within the statistical uncertainty of KENO the finite fuel storage array was done using 16 energy groups, o
5)
The 16 energy group cross sections were generated using XSDRNPM for the 8" concrete walls, 16 inch concrete floor, 4 inch concrete ceiling and the external water mist between the fuel assembly array and the ceilings and the walls.
The 16 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 with the grids being neglected).
Dimensional details of the calculational model and results obtained are shown in Figures 8.24 and 8.25.
The resulting Keff for the finite fuel storage array is 0.715 1 0.004 which is well below a Keff of 0.95.
The local fire departments have been instructed to use only l
dry chemical extinguishing methods in the fuel assembly l
Storage room l
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