ML20095G873

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Evaporation Time of Entrapped Air Moisture in E-419
ML20095G873
Person / Time
Site: San Onofre  Southern California Edison icon.png
Issue date: 12/14/1995
From: Gregovich M, Udrea F
SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML20095G861 List:
References
M-0073-126, M-0073-126-R00, M-73-126, M-73-126-R, NUDOCS 9512210349
Download: ML20095G873 (15)
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Text

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CALCULATION TITLE PAGE .

ICCN NOJ PRELIM. CCN NO. PAGE !OF M CCN CONVERSION:

CCN NO. CCN-Cric No.M-0073-126 DCP/FIDCN/ FCN No. & Rev.

Subject :

Evaporation Time of Entrapped Air Moisture in E-419 Sheet of System Number / Primary Station System Designators 1510 /GKA SONGS Unit 2/3 0-Class f Tsch. Spec. Affecting? I NO O YES Section No. Equipment Tag No.

CONTROLLED PROGRAM PROGRAM / DATABASE NAME(S) VERSION / RELEASE NO. (S)

COMPUTER -

PROGRAM / DATABASE DATABASE Accord 5 to SO123-XXIV-5.1 RALSO. LISTED BELOW RECORD OF ISSUES TOTAL PREPARED APPROVED

" (Print name/ sign /date) (signature /date)

DESCRIPTION ST S T

  • Yh k6 l MM f" M y p ,g ggggy m oT ER ORIG. FLS OTHER

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OTHER IRE 4 OTHER 041 FLS OTFER

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IRE OTHER OTHER ORIG FLS OTHER

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IRE OTHER OTHER Space for RPE Stamp, identify use of an alternate calc., and notes as applicable.

I TNs calc. was prepared for the identified DCP/FCN. DCP/FCN completion and tumover acceptance to be verified by' receipt of a memorandum directing DCN Conversion. Upon receipt, this calc. represents the as-built condition. Memo date. by sCE 28121 1 REY.1 8/95 [

REFERENCE:

so123. XXIV 7.15) 9512210349 951218 DR ADOCK0500g1 7 t,e170,,aFosuswEco_cEm12i_1 oi uor v.r os oo oc staissa

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CALCULATION CROSS-INDEX llCCN NOJ PAGE OF fREUM. CCN NO.

CN CONVERSION:

Calculation No. M-0073-126 Evaporation Time of Entrapped Air Moisture in E-419 Sheet No. 2 of /[ CN NO. CCN-INPUTS OUTPUTS Does the out-C Results and conclusions of the subject nterface These interfacing cale.utations and/or identify output interface documents provide input to the subject calculation are used in these interfacing

, document calc / document CCN DCN.

calculation and if revised may require calculations and/or documents. TCN/Rev FIDCN,or F S inihls

" " " * * " " **'#" " require and date revision? tracking number.

Calc i Document No. Rev. No. Calc / Document No. Rev. No. YES/NO 0 72%'fNfCAL SWF1W174 kmC/7d ygc pcx; goy gog3 43 l23

$* 7 5 AcoMTBoL Room

' "N 1 DWG. 41358 DWG. 41368 9 EMM66#C/ UN#

DWG.40096 13 e

sCE 26424 REY. 2 8195 [

REFERENCE:

SO1234XIV-7.15]

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EC&FS DEPARTMENT l CALCULATION SHEET iCCN NO./

PRELIM. CCN NO. PAGE OF I CCN CONVERSION Project or DCP/MMP Calc No. M-0073-126 CCN NO. CCN - I 1

subject EVAPORATION TIME OF ENTRAPPED M0ISTURE IN E-419 Sheet No. 3 ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE REY l F. Udrea Gregovich l TABLE OF CONTENTS SECTION SHEET NO.

1

1. PURPOSE / BACKGROUND 4
11. RESULTS/ CONCLUSIONS 5 111. ASSUMPTIONS 6 IV. DESIGN INPUT 7 V. METHODOLOGY 8 VI. REFERENCES 9 Vll. NOMENCLATURE 10 Vill. CALCULATION 11 IX. APPENDICES 14 d

\

EC&FS DEPARTMENT l CALCULATION SHEET ICCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION Preject or DCP/MMP Calc No. M-0073-126 CCN NO. CCN -

subject EVAPORATION TIME OF ENTRAPPED MOISTURE IN E-419 Sheet No.

REY ORIGINATOR DATE IRE DATE l REV ORIGINATOR DATE IRE DATE F. Udrea Gregovich I. PURPOSE / BACKGROUND During idle periods of operation, the entrapped air in the intake plenum of the Control Room Emergency Air Conditioning Units, E-418 and 419, contains moisture vapors that may degrade the effectiveness of the charcoal filters.

Calculation M-0073-125 determined that, under design conditions, the relative humidity of the entrapped air will not exceed the maximum allowable limit of 70%.

This calculation assumes that the water vapor in the entrapped air will reach its dewpoint and will condense into a water film on the bottom surface of E-419 unit plenum.

The purpose of this calculation is to determine the time for the condensed water to evaporate when the unit is restarted. Emergency Air Conditioning Unit,419,is considered the conservative case based on the results of the Calculation M-0073-125.

EC&FS DEPARTMENT i CALCULATION SHEET tijNNO x CCN NO. PAGE OF l

l CCN CONVERSION Project or DCP/ HHP Calc No. M-0073-126 CCN NO. CCN -

Subject EVAPORATION TIME OF ENTRAPPED M0ISTURE IN E-419 Sheet No.

REV ORIGINATOR OATE IRE CATE l REV ORIGINATOR DATE IRE DATE F. Udrea Gregovich II. RESULTS/ CONCLUSIONS:

For the Control Room Emergency Air Conditioning Unit, E-419, the time to evaporate the condensation from the entrapped moist air is 1.34 hours3.935185e-4 days <br />0.00944 hours <br />5.621693e-5 weeks <br />1.2937e-5 months <br />.

2 R

7 EC&FS DEPARTMENT CALCULATION SHEET iccN no./

PRELIM. CCN No. PAGE OF CCN CONVERSION Project or DCP/MMP Calc No. M-0073-126 CCN No. CCN -

subject _LVM0 RATION TIME OF ENTRAPPED M0ISTURE IN E-419 Sheet No.

REV ORIGINATOR OATE IRE DATE REV ORIGINATOR OATE 1RE DATE F. Udrea Gregovich 111. ASSUMPTIONS:

1. Upon shutdown of CREACUS, Train B, the air entrapped in volume (V), is initially

~

at 68.32 F and 51% RH (Reference 1 and design input 2).

lt is assumed that the entrapped air will cool to the dew point,50 F and 100% RH at which point condensation will occur (see point 2 on the psychometric chart).

50 F is well below the coldest postulated temperature in the Fan Room. It is only assumed for purpose of forcing condensation in the entrapped air.

2. To conservatively evaluate the evaporation time, it was assumed that the moisture content of the entrapped air volume is confined within the volume inside E-419 directly upstream of charcoal filter beds and charcoal filter material is impervious to water.
3. All condensation will collect on the bottom surface of E-419 which will contain
traces of moisture (see surface S on the sketch in the Appendix). Thus, moisture film (surface) evaporation will take place. This is conservative since it provides less I evaporation surface than would otherwice be expected.
4. For conservatism, the evaporation rate is calculated from 100%RH to 70%RH (corresponding to 64 FDB temperature), point 3 to point 4 on the psychrometric chart (see sheet 13).
5. For conservative results, rate of evaporation for parallel flow will be used in the evaluation.
6. Air velocity at the boundary (duct sides) is considered 1/3 of.the velocity across the E-419 filter section (Reference 3 page 106)
7. The mixing of outside air and return air is perfect.

EC&FS DEPARTMENT CALCULATION SHEET ICCN NO./

PRELIM. CCN NO.

, PAGE OF CCN CONVERSION Project or DCP/ HHP Calc No. M-0073-126 CCN NO. CCN -

, subject EVAPORATION TIME OF ENTRAPPED M0ISTURE IN E-419 Sheet No. 7 REV ORIGINATOR DATE IRE DATE REY ORIGINATOR DATE IRE DATE F. Udrea Gregovich IV. DESIGN INPUT

1. Volume (V) : 2388 ft (References 4,5 and 6, see sketch in the appendix)

Where: (V) represents the volume define by the A-206 fan assembly, the ductwork between A-206 and E-419, E-419 plenum upstream of the charcoal filter and the HV-9778 damper on the return air duct (see sketch in the appendix).

2. Conditions of trapped air (V) t,n: 68.32 F and 51% RH (Reference 1)

(see point 1 on the psychrometric chart on sheet 13)

3. The' moisture in contact with recirculated air tends to follow the saturation line to the wet bulb temperature of the recirculated air, point 3 (57.5 F and 100% RH) on the psychrometric chart sheet 13 (Reference 2, page 5-13). This condition would apply to the condensed moisture when the HVAC Train is restared.
4. Air flow across the Emergency Air Conditioning Unit E-419 is: 35,705 CFM (Reference 7) l

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EC&FS DEPARTMENT CALCULATION SHEET iCCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION Preject or DCP/MMP Cale No. M-0073-126 CCN NO. CCN -

Subject EVAPORATION TIME OF ENTRAPPED M0ISTURE IN E-419 Sheet No.

REV ORIGINATOR DATE 1RE DATE REY ORIGINATOR CATE 1RE DATE F. Udrea Gregovich l

4 V. METHODOLOGY The total mass of moisture entrapped in volume (V) is determined from its initial condition. This entrapped air is assumed to cool to its dew point temperature and all moisture is assumed to condense and collect on the bottom surface of Emergency Air Conditioning Unit, E-419, plenum in an uniform water film.

The evaporation rate of the water film is calculated using the evaporation formula for parallel air flow (the air flow is parallel to the surface area of water being evaporated).

The evaporation time is then calculated by dividing the mass of condensed water I by the evaporation rate.

All cooling and evaporation process are shown on the enclosed psychometric chart (sheet 13).

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EC&FS DEPAFITMENT CALCULATION SHEET iCCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION Project or DCP/MMP Calc No. M-0073-126 CCN NO. CCN -

Subject EVAPORATION TIME OF ENTRAPPED MOISTURE IN E-419 Sheet No. k REY ORIGINATOR OATE IRE DATE l REV ORIGINATOR DATE IRE CATE F. Udrea Gregovich VI.

REFERENCES:

1. Calculation M-0073-125 -
2. Fan Engineering by Buffalo Forge Co., Eighth Edition
3. Fan Engineering by Buffalo Forge Co., Fifth Edition
4. Filter House, Aux. Bldg., Control Room Complex Emergency Air Conditioning Unit
  1. E419, SO23 410-1-8 Rev.11
5. Area'CA9, HV&AC El 50'-0" to 30'-0",41358 Rev.12
6. Area CA9 &CA10 HV&AC Partial Plan,41368 Rev.9
7. Air Flow Diagram Train B - Control Bldg.- El 30'-0", 40096 Rev.13

/

EC&FS DEPARTMENT CALCULATION SHEET iCCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION <

l Project or DCP/MMP Calc No. M-0073-126 CCN NO. CCN -

4 subject EVAPORATION TIME OF ENTRAPPED M0ISTURE IN E-419 Sheet No. !8 REY ORIGINATOR DATE 1RE DATE REV ORIGINATOR DATE IRE DATE F. Udrea Gregovich l

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Vll. NOMENCLATURE  ;

Nomenclature is defined in the body of the calculation. (

1 l

l l

l e 4 4

4 1

1 l

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I EC&FS DEPARTMENT CALCULATION SHEET ICCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION Project or DCP/HMP Calc No. M-0073-126 CCN NO. CCN -

Subject EVAPORATION TIME OF ENTRAPPED M0ISTURE IN E-419 Sheet No. //

REV ORIGINATOR l OATE !RE DATE l REV ORIGINATOR DATE IRE DATE F. Udrea Gregovich Vill. CALCULATION:

1. Determine the mass of vapor in volume (V): 1 At 50 F, the vapor density is 0.000587 LB/ft (Reference 3, page 20))

Total mass of water vapor in volume V = 2388 ft (Reference Design input 1) is:

2388 x 0.000587 = 1.4 LB water vapor

2. Determine the rate of evaporation:

The rat,e of evaporation with parallel air flow is (Reference 2 page 5-13) r$1 y p.,,n,i = S 95 + 0.425 v (p,, - p )

hw .

Where: m y= rate of evaporation in LB/Hr v = velocity of air flow in ft./ min.

p , = vapor pressure corresponding to water temperature in inches of mercury p, = vapor pressure of the moist air in inches of mercury hw = latent heat of evaporation in BTU /LB 2

S = exposed water surface in ft The air velocity across the E-419 unit is:

V= CFM (Desian input 4) = 35.705 Cross Section Area E-419 (see sketch in Appendix) 14.83x15.5

= 155.33 ft/ min v = 155.33 / 3 = 51.77 ft/ min (Assumption 6) p., = 0.4832 inches Hg (Design input 3 and Reference 2, Table 1.7 )

point 3 on the psychrometric chart, sheet 13 P. = P. x RH Where: p, = 0.6009 vapor pressure of the dry bulb temperature 64 FDB (Assumption 4 and Reference 2, Table 1.7) point 4 on the psychrometric chart, sheet 13

EC&FS DEPARTMENT CALCULATION SHEET ICCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION i Project or DCP/MMP Calc No, M-0073-126 CCN NO. CCN -  !

subject EVAPORATION TIME OF ENTRAPPED MOISTURE IN E-419 Sheet No. /2 REV CRIGINATOR DATE IRE DATE l REV ORIGINATOR DATE IRE DATE F. Udrea Gregovich RH = relative humidity,70% (Assumption 4) point (4) on the psychrometric chart I p, = 0.6009 x 0.70 = 0.4206 inches Hg hw = 1065 BTU /LB at 50 FWB dew point (Assumption 1 and Reference 2, Fig.1.5)

S3,,,,, = 10.25 x 14.83 = 152 ft (Assumption 3 and sketch in the Appendix) j rn v boundary = 152 ( 95 + 0.425 x 51.77) (0.4832 - 0.4206) 1065

= 152 x 0.1098 x 0.0626 = 1.045 LB/Hr

3. Determine the time to evaporate the entrapped moist air:

With an evaporation rate of 1.045 LB/H, will take 1.4 LB/1.045 LB/Hr = 1.34 Hr. .

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EC&FS DEPARTMENT CALCULATION SHEET ICCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION Project or DCP/MMP Calc No. M-0073-126 CCN NO. CCN -

subject EVAPORATION TIME OF ENTRAPPED M0ISTURE IN E-419 Sheet No. !Y R[v ORIGINATOR DATE IRE DATE l REV ORIGINATOR DATE 1RE DATE F. Udrea Gregovich I, APPENDICES I

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