16 Battery Room Flammable Gas Conc

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Office of Nuclear Reactor RegulationDivision of Systems Safety and AnalysisPlant Systems BranchFire Protection Engineering and Special Projects Section

CHAPTER 16. CALCULATING THE RATE OF HYDROGEN GIN BATTERY ROOMSVersion 1805.0The following calculations estimate the hydrogen gas generation in battery rooms.Parameters in YELLOW CELLS are Entered by the User.Parameters in GREEN CELLS are Automatically Selected from the DROP DOWN ME

All subsequent output values are calculated by the spreadsheet and based on values speciparameters. This spreadsheet is protected and secure to avoid errors due to a wrong entr The chapter in the NUREG should be read before an analysis is made.

INPUT PARAMETERSBATTERY INFORMATION

Float Current (F C)

Ampere Hours (A H)Number of Cells (N)

Constant (K)COMPARTMENT INFORMATION

Compartment Width (w c)

Compartment Length (l c)

Compartment Height (h c)

FLAMMABLE GAS INFORMATIONLower Flammability Limit of Hydrogen

Float Current Demand of Fully Charged Stationary Lead-Acid CellsReference: Yuasa, Inc., Safety Storage, Installation, Operation, and Maintenance Manual, S

Heritage Series, Flooded Lead-Acid Batteries, 2000.

FC*Charge Voltage Antimony(VPC) New Select Charg2.15 152.17 19 Scroll to des2.20 262.23 372.25 452.27 602.33 1202.37 1952.41 300User Specified Value Enter Value *(milliamperes per 100 AH @ 8-hr. rat

FC*Charge Voltage Antimony(VPC) Old Select Charg2.15 602.17 80 Scroll to des

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2.20 1052.23 1502.25 1852.27 2302.33 4502.37 7002.41 1100User Specified Value Enter Value *(milliamperes per 100 AH @ 8-hr. rat

FC*Charge Voltage Antimony(VPC) Calcium Select Charg2.152.17 4 Scroll to des2.20 62.23 82.25 112.27 122.33 242.37 382.41 58User Specified Value Enter Value *(milliamperes per 100 AH @ 8-hr. rat

METHOD OF YUSHA, INC.Reference: Yuasa, Inc., Safety Storage, Installation, Operation, and Maintenance Manual, S

Heritage Series, Flooded Lead-Acid Batteries, 2000.

Estimating Hydrogen Gas Generation RateH2(gen) = F C/1000 x A H/100 x K x N This equation

For every 15

Where H2(gen) = hydrogen gas generation rate (ft3

/min)FC = float current (mA per 100 A H @ 8-hr. rate)

AH = ampere hours (normal 8 hour)

K = constant - 1 A H = 0.000267 ft3

N = number of cellsH2(gen) = F C/1000 x A H / 100 x K x N x 2 Since electrol

H2(gen) = 0.044 ft3 /min 0.001252

Estimating Hydrogen Gas in Compartment Based on Given FlammabiH2(comp) = V x FL

Where H2(comp) = hydrogen gas in compartment (ft3)

V = volume of compartment (ft 3)FL = hydrogen gas flammability limit

Volume of CompartmentV = w c x lc x h cWhere V = compartment volume (ft 3)

wc = compartment Width (ft)

lc = compartment Length (ft)

h c = compartment Height (ft)


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Revision Log Description of Revision1805.0 Original issue with final text.


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S GENERATION

U for the Charge Voltage Selected.fied in the input

in a cell(s).

37 mA per 100 A H @ 8-hr. rate

3730.00 Ampere hours60.00

0.000267 ft3

26.00 ft

50.00 ft

12.00 ft

4.00 Percent 0.040

Calculate

ction 58.00,

Current Value

ired value then Click on selection

e)

Current Value



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e)

Current Value


e)

ction 58.00,

is based on when electrolyte temperature is 77 F (25 C)F (8 C) electrolyte temperaturte rise the equation will multiply by 2

te temperature is 92 F (33 C) the equation is multiply by 2

m 3 /min

lity Limit

Answer


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Flammability Limit

(min)

hours

Safety Storage,eries, Flooded

s. The results of r a given situation,

ults of hand calculation,

(s) in the spreadsheet,

Answer


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DateJanuary 2005


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CHAPTER 16. CALCULATING THE RATE OF HYDROGEN GAIN BATTERY ROOMSVersion 1805.0The following calculations estimate the combustible gas concentration buildup time in encloseParameters in YELLOW CELLS are Entered by the User.Parameters in GREEN CELLS are Automatically Selected from the DROP DOWN MENU

All subsequent output values are calculated by the spreadsheet and based on values specifieparameters. This spreadsheet is protected and secure to avoid errors due to a wrong entry inThe chapter in the NUREG should be read before an analysis is made.

INPUT PARAMETERSCOMPARTMENT INFORMATION HYDROGEN LEAK INFORMATION

Compartment Width (w c)

Compartment Length (l c)Compartment Height (h c)

Leakage Rate

Percent of Combustible Gas/Air Mixture

Combustible Gas Concentration (C)Mixing Efficiency Factor (K)

Mixing Efficiency (K Values) for Various Ventilation ArrangementsReference: NFPA 69, "Standard on Explosion Prevention Systems," 1997 Edition.

K Select Ventilation ArrangemSingle Exhaust Opening 0.2Multiple Exhaust Openings 0.3 Scroll to desired arrangement then C





K Select Ventilation Arrangem

Single Exhaust Opening Enter ValueMultiple Exhaust Openings Enter Value

Scroll to desired arrangement then C

0.3

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METHOD OF NFPA 69, STANDARD ON EXPLOSION PREVENTION SYSTReference: NFPA 69, "Standard on Explosion Prevention Systems, 1997 Edition, Appendix D.

Estimating Number of Theoretical Air Changesln [1 - (CQ / G)] = - K NWhere C = combustible gas concentration

Q = volume of air in enclosure (ft 3/min)G = combustible gas leakage rate (ft 3/min)K = mixing efficiency factor (constant)N = number of theoretical air changes

Q = volume of air in enclosureQ = 85.00 ft3/min

G = combustible gas leakage rateG = 15 (ft3/min)

N = number of theoretical air changesln [1 - (CQ / G)] = - K Nor N = - [ln(1 - (CQ/G))]/ K

N = 0.40

Estimating Combustible Gas Concentration Buildup Timet = (V / leakage rate) * NWhere t = buildup time (min)

V = compartment volume (ft 3)leakage rate (ft 3/min)N = number of theoretical air changes


wc = compartment Width (ft)

lc = compartment Length (ft)

hc = compartment Height (ft)

V = 5220.00 ft3

Combustible Gas Concentration Buildup Timet = (V / leakage rate) * N

t = 20.93 minute

The above calculations are based on method presented in the NFPA 69, "StanExplosion Prevention Systems, 1997 Edition.Calculations are based on certain assumptions and have inherent limitations.such calculations may or may not have reasonable predictive capabilities for aand should only be interpreted by an informed user.

Although each calculation in the spreadsheet has been verified with the resultthere is no absolute guarantee of the accuracy of these calculations.

Answer

NOTE

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Any questions, comments, concerns, and suggestions, or to report an error(s)please send an email to [email protected] or [email protected].

Prepared by: Date Organization

Checked by: Date Organization

Additional Information


11


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GENERATION

d compartments.

for the Infiltration Selected.d in the inputa cell(s).

29.00 ft

15.00 ft12.00 ft

100.00 ft3/min

15.00 percent 0.15

2.00 percent 0.020.3

Calculate

ent

lick on selection

ent

lick on selection

ent

lick on selection

ent

lick on selection

ent

lick on selection

ent

lick on selection

12


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MS

dard on

The results of given situation,

of hand calculation,

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in the spreadsheet,

DateJanuary 2005

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CHAPTER 16. CALCULATING THE RATE OF HYDROGEIN BATTERY ROOMSVersion 1805.0 The following calculations estimate the flammable concentration of gases and vaporsParameters in YELLOW CELLS are Entered by the User.

Parameters in GREEN CELLS are Automatically Selected from the DROP DOWN All subsequent output values are calculated by the spreadsheet and based on valuesparameters. This spreadsheet is protected and secure to avoid errors due to a wrongThe chapter in the NUREG should be read before an analysis is made.

INPUT PARAMETERSLower Flammability Limit of Flammable Gas or Vapor (LFL)Compartment Width (w c)

Compartment Length (l c)

Compartment Height (h c)

LOWER FLAMMABILITY DATA FOR GASES AND VAPORSGases and LFL Select Gas or Vapor

Vapors Volume-PercentScroll to desired gas

Hydrogen 4.00Carbon Monoxide 12.50Methane 5.00Ethane 3.00Propane 2.10

n-Butane 1.80n-Pentane 1.40n-Hexane 1.20n-Heptane 1.05n-Octane 0.95n-Nonane 0.85n-Decane 0.75Ethene 2.70Propane 2.40Butene-1 1.70

Acetylene 2.50Methanol 6.70Ethanol 3.30n-Propanol 2.20

Acetone 2.60Methyl Ethyl Ketone 1.90Diethyl Ketone 1.60Benzene 1.30User Specified Value Enter ValueReference: SFPE Handbook of Fire Protection Engineering , 3 r Edition, 2002, Page 2-

ESTIMATING FLAMMABLE CONCENTRATION OF GASES USING

H dro en


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Volume of Gas or Vapor for Deflagration = V x LFLWhere V = volume of enclosure (ft 3)

LFL = lower flammability of a gas or vapor (pe


wc = compartment width (ft)

lc = compartment length (ft)

h c = compartment height (ft)

V = 1000.00 ft3

Volume of Gas or Vapor for Deflagration = V x LFL

Volume of Gas or Vapor for Deflagration = 40

The above calculations are based on principles developed in the SFPProtection Engineering, 3 rd Edition, 2002.Calculations are based on certain assumptions and have inherent limiof such calculations may or may not have reasonable predictive capasituation, and should only be interpreted by an informed user.

Although each calculation in the spreadsheet has been verified with ththere is no absolute guarantee of the accuracy of these calculations.

Any questions, comments, concerns, and suggestions, or to report anplease send an email to [email protected] or [email protected].

Prepared by: Date

Checked by: Date

Additional Information

NOTE


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GAS GENERATION

in enclosures.

MENU for the Gas or Vapor Selected.specified in the inputentry in a cell(s).

4.00 Percent 0.04010.00 ft

10.00 ft

10.00 ft

Calculate

or vapor then Click on selection

175.

IMITS OF FLAMMABILITY


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cent-volume)

ft3 1.13 m3

Handbook of Fire

ations. The resultsilities for a given

e results of hand calculation,

error(s) in the spreadsheet,

Organization

Organization

Answer


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DateJanuary 2005


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16 Battery Room Flammable Gas Conc