ML20095G870

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Relative Humidity at Charcoal Beds (E-418 & 419),no Heating
ML20095G870
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-0073-125, M-0073-125-R00, M-73-125, M-73-125-R, NUDOCS 9512210348
Download: ML20095G870 (15)
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. 1 CALCULATION TITLE PAGE ICCN NO1 PRELIM. CCN NO. PAGE  ! OF CCN CONVERSION:

CCN NO. CCN-Calc No M-0073-125 DCP/FIDCN/ FCN No. & Rev.

Relative humidity at Charcoal Beds (E-418 &419), No Heating Sheet of Subject :

System Number /Primaqr Station System Designators 1510 /GKA SONGS Unit 2/3 o-Class J Tech. Spec. Affecting? # NO O YES Section No. Equipment Tag No.

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

COMPUTER ==

PROGRAM / DATABASE DATABASE Accordirg' to SO123-XXIV-5.1 UALSO, LISTED BELOW RECORD OF ISSUES TOTAL PREPARED APPROVED (Print name/ sign /date) (Signature /date)

DESCRIPTION ST S T

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

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Ths calc. was prepared for the identified DCP/FCN. DCP/FCN completion and turnover acceptance to be venfied by receipt of a memorandum dir:cting DCN Conversion. Upon receipt, this calc. represents the as-built condition. Memo date. by sCE 261211 REV. i 8/95 [

REFERENCE:

so123.XKlV 7.15]

DO K ji i uETroRuroRuswEco_ GEN \121_1_01 MOF ver 0100 00 6/6/953

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CALCULATION CROSS-INDEX FCCN NOJ

, FRELIM. CCN NO. PAGE OF Cdculation No. Relative Humidity at Charcoal Beds (418&419), no heating Sheet No. 2 of /[ CN N C- ,

INPUTS OUTPUTS Does the out. '

ese intedadng dculadons andor Resuth and concludons of me suW num d G Identify output interface documents provide input to the subject calculation are used in these interfacing calc / document CCN, DCN.

calculadon and if tM may quire calculations and/or documents. document '

FLS initials TCN!Rev FIDCN* or g revision of the subject calculation. if' y ,

Calc 1 Document No. Rev. No. Calc / Document No. Rev. No. YES1NO l

M-73-041 7 M /25 O No M-73-041 ICCN C-6 0 M-73-041 ICCN C-7 o x , DWG. 40030 13 DWG. 40096 13 DWG. 41358  :

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EC&FS DEPARTMENT CALCULATION SHEET iCCN NO./

PRELIM. CCN NO.

h PAGE OF dNCONVERSION Project or DCP/FCN Calc No. M-0073-125 CCN NO. CCN -

Subject RELATIVLitVMIDjTY AT CHARCOAL BEDS (E-418&419).N0 OSA HEATING Sheet No. 8 REV ORIGINATOR l DATE l IRE DATE l REV l ORIGINATOR CATE IRE DATE F. Udrea Gregovich TABLE OF CONTENTS l

SECTION SHEET NO.

4

1. PURPOSE / BACKGROUND 4 II. RESULTS/ CONCLUSIONS 5 Ill. ASSUMPTIONS 6 IV. DESIGN INPUT 7

, V. METHODOLOGY 8

. VI. REFERENCES 9 i

Vll. NOMENCLATURE 10 Vill. CALCULATION 11 IX. APPENDICES 14 I

SCE 26-426 NEW 4/90 l

EC&FS DEPARTMENT CALCULATION SHEET ICCN NO./

PRELIM. CCN NO. OF PAGE CCN CONVERSION Project or DCP/FCN Calc No. M-0073-l?5 CCN NO. CCN -

subject RELATIVE HUMIDITY AT CNAEC0AL BEDS (E-418&419). N0 HEATING Sheet No. I REV ORIGINATCR DATE IRE lCATE l REV ORIGINATOR CATE IRE DATE F. Udrea Gregovich I. PURPOSEBACKGROUND:

Determine the condition of the air upstream of the charcoal filter (E-418 and E-419).

Per "USNRC Regulatory Guide RG 152" (Reference 10 ), the maximum allowable air humidity upstream of the charcoal beds is 70%

PCN 407 requested that co credit be taken for Emergency Ventilation Unit Heaters E-296 or E-297, duchg the rnonthly 10-hour surveillance of the CREACUS test, because SCE is not cuw.;;y taking credit for Emergency Ventilation Units (A-206 or E-207). In their review, the NRC expressed concern that the charcoal in the Emergency Air Conditioning Units may degrade to an unacceptable level without the monthly drying presently accomplished by the E-296 and E-297 heaters.

SCE 26-426 NEW 4!90 1

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EC&FS DEPARTMENT CALCULATION SHEET iCCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION Project or DCP/FCN Calc No. M-0073-125 CCN NO. CCN -

Subject RELATIVE HUMIDITY AT CHARC0AL BEDS (E-4J8&419).N0 8 OSA HEATING Sheet No. _(

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

For the evaluated scenario the relative humidity of the air upstream of the charcoal filter in the Emergency Air Conditioning Unit will not exceed the required maximum of 70%.

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SCE 26-426 NEW 4/90

EC&FS DEPARTMENT CALCULATION SHEET ICCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION Project or DCP/FCN Calc No. M-0073-125 CCN NO. CCN - 1 Subject RELATIVE HUMIDITY AT CHAEC0AL BEDS (E-418&419). N0 HEATING Sheet No. [

REV ORIGINATOR DATE l IRE DATE l REV ORIGINATOR DATE 1RE DATE F. Udrea Gregovich Ill. ASSUMPTIONS:

1. During non operating periods, the moisture in air is trapped in volume (V), Train B, defined 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).

There are no dampers on the return ducts on Train A, therefore the moisture in the air is dissipated to the rooms. Thus no calculation is performed Train A.

2. The temperature of moist air entrapped in the volume (V), during the 30 day idle period, will reach equilibrium with the fan room temperature.
3. Fire dampers located at the common wall between the fan room and computer ,

room are open and air is being transferred from the computer room to the fan room.

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4. Fan Room lights are on, normal operating condition due to operation action and inspection requirements.
5. Heat of compression for the outside supply air is significant enough to be ,

considered in the evaluation.

6. Evaluation is performed during winter operation when outside air relative humidity is 100%
7. From Reference 7, the fan efficiency is assumed to be 70%.

SCE 26-426 NEW 4/90

EC&FS DEPARTMENT CALCULATION SHEET ICCN NO./

PRELIM. CCN h0. PAGE OF dNCONVERSION Project or DCP/FCN Calc No. M-0073-125 CCN NO. CCN -

subject ELATIVE HUMIDITY AT'CHARC0AL BEDS (E-418&419).N0 OSA HEATING Sheet No. [

REV ORIG!hATOR DATE IRE CATE REV ORIGINATOR DATE IRE DATE F. Udrea Gregovich l IV. DESIGN INPUT:

1. OSA (outside supply air): 2,050 CFM at 36 FDB and 100% RH (Reference 1

& 6), point 1 on the psychrometric chart, sheet 13

2. Return Air: 33,655 CFM at 70 FDB and 50% RH (Reference 1), point 3 on the psychrometric chart, sheet 13
3. Transfer Air to the Fan Room: 860 CFM at 70 FDB and 50% RH (Reference 1)
4. Exhaust Air from the Fan Room: 820 CFM (Reference 1)
5. Fan Room (233) Lighting Load: 4,670 Btuh (Reference 6)
6. Emergency Ventilating Units A-206 & A-207 and Emergency Air Conditioning Units E-419 & E-418 (CREACUS) test is per'ormed every 30 days (Reference 10).
7. Unit 206, fan outlet area: 0.37ft2(based on as built measurements, see sketch l in the appendix) l l

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i SCE 26-426 NEW 4/90

EC&FS DEPARTMENT CALCULATION SHEET iCCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION Project or DCP/FCN Calc No. M-0073-125 CCN NO. CCN -

subject RELATIVE HUMIDITY AT CHARC0AL BEDS (E-418&419),N0 OSA HEATING Sheet No.

RIV ORIGINATOR DATE IRE DATE llREV ORIGINATOR DATE IRE DATE F. Udrea Gregovich 1

V. METHODOLOGY:

The calculation indicates that the worst impact to the Emergency Recirculation charcoal filter is during winter operation. The Normal Control Room Complex Air Conditioning (E-295) System is normally operating when a CRIS is actuated or the CREACUS surveillance is due. One Train of the Control Room Complex Emergency Air Conditioning System operates automatically / manually. During this condition, outside air is supplied by the Emergency Ventilation Unit (A-206) and enters the inlet end of the Emergency Air Conditioning Unit (E-419) and is mixed with the return air coming from the different areas of the control room complex. Air from Computer Room,232, is transferred to Fan Room 233 to maintain an acceptable temperature.

l To determine the condition of the entrapped air, the temperature of the mixed  ;

return air and outside air will be calculated. Fan Room 233 temperature is calculated by using the room heat balance. Subsequent to the 10 hour1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> CREACUS test, the temperature of the entrapped air in volume (V) will reach equilibrium with Room 233 temperature. The final condition of the entrapped air will be determined using the psychometric chart by cooling the entrapped air to the calculated room

temperature.

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l SCE 26 426 NEW 4/90

1 EC&FS DEPARTMENT CALCULATION SHEET ICCN NO./

PRELIM. CCN NO. PAGE OF

~

CCN CONVERSION Project or DCP/FCN Calc No. M-0073-125 CCN NO. CCN -

Subject RELATIVE HUMIDITY AT CHAEC0AL BEDS (E-418&419). N0 HEATING Sheet No. O I REV f ORIGINATOR DATE 1RE DATE l REY ORIGINATOR DATE 1RE DATE l

F. ;Jdrea Gregovich VI. REFERENCES

1. Air Flow Diagram Train B - Control Bldgs.-El 30'-0", 40096 Rev.13
2. Equipment Schedule HV&AC,40030 Rev.13
3. Area CA9, HV&AC El 50'-0" to 30'-0", 41358 Rev.12
4. Fan Engineering by Buffalo Forge Co., Fifth Edition
5. ASHRAE Fundamentals 1985 Edition
6. Calculation M-73-041 Rev. 7. ICCN C-6, ICCN C-7
7. Barry Blower Fan, S023 410-1-798 Rev. 0
8. Filter House, Aux. Bldg., Control Room Complex Emergency Air Conditioning Unit
  1. E419, S023 410-1-8 Rev.11
9. Area CA9 & CA10 HV&AC Partial Plan,41368 Rev. 9  !
10. USNRC Regulatory Guide RG 152 Rev. 2 I

l SCE 26-426 NEW 4/90 l

EC&FS DEPARTMENT CALCULATION SHEET ICCN CCN NO. PAGE OF CCN CONVERSION Project or DCP/FCN Calc No, M-0073-125 CCN No. CCN -

subject RELATIVE HUMIDITY AT CHARC0AL BEDS (E-418&419).N0 OSA HEATING Sheet No. !8 RTV CRIGINA10R DATE IRE DATE llREV l ORIGINATOR DATE IRE DATE F. Udrea Gregovich Vll. NOMENCLATUM Nomenclature is defined h the body of the calculation.

1 SCE 26-426 NEW 4/90 J

EC&FS DEPARTMENT CALCULATION SHEET ICCN NO./

PRELIM. CCN NO. PAGE OF l

l

~

CCN CONVERSION Project or DCP/FCN Calc No. M-0073-125 CCN NO. CCN -

Subject RELATlyLHUMIDITY AT CHARC0AL BEQS (E-418&419).N0 OSA HEATING Sheet No.

lREV ORIGINATOR CATE 1RE DATE REV l ORIGINATOR lCATE l IRE lDATE F. Udrea Gregovich Vill. CALCULATION

1. Temperature rise due to the compression of OSA, unit A-206 increase in temperature is: 0.367((total pressure / total efficiency) -velocity pressure) (Reference 4 page 165)

Temperature increase = 0.367 [(10.6/0.7) - 1.85] = 4.88 F where: Fan static pressure = 10.6 inch WC (Reference 2)

. Fan outlet velocity = 2,050 CFM/0.37 sq. Ft.= 5,540 FT/ min (Design input 7)

Velocity pressure = 1.85 iriches WC (Reference 5, page 33.25)

Efficiency = 70% ( Assumption 7)

Air temperature at the fan outlet opening (tg ) is:

tg = 36 + 4.88 = 40.88 F (36 F is from Design Input 1), point 2 on the psychrometric chart, sheet 13

2. Mixed air temperature in E-419 plenum (point 4 on the psychometric chart sheet 13) t, = 33.655x70 + 2.050x40.88 = 68.32 F at 51% RH 33,655+ 2,050 This is the temperature and relative humidity (RH) of the volume (V) at the end of 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> surveillance.
3. Fan Room 233 temperature t,,,,n (psychrometric chart, Page 13 ):

h bldg.

air supply light air return SCE 26-426 NEW 4/90

EC&FS DEPARTMENT CALCULATION SHEET ICCN NO./

PRELIM. CCN NO. PAGE OF CCN CONVERSION Project or DCP/FCN Calc No. M-0073-125 CCN NO. CCN - 1 Subject RELATIVE HUMIDITY AT CHARC0AL BEDS (E-418&419),N0 OSA HEATING Sheet No. M REV l ORIGINATOR DATE l 1RE DATE lREV ORIGINATOR lDATE IRE DATE l F. Udrea Gregovich l

l Fan room heat balance:

Oiigs, - Obida + O,i, ,upp,y- O,i, ,,,u,n = 0 Building Load O (Btu /h) = A x U x At Where: A = area in ft (Reference 3 & 9)

U = heat transfer coefficient in BTU / ft , At, F (Reference 6)

At = temperature difference in F (Reference 6) 0,,;nn, = 1370 x 0.2 x (t,,,m- 50) = 274 t,,,m- 13,700 Onoo, =1370 x 0.36 x (t,,,m- 50) = 493 t,,,m- 24,660 0,,n y = 520 x 0.3 x (t,,,m- 50) = 156 t,,,m- 7,800 0,,n w = 800 x 0.3 x (t,,,m- 36) = 240 t,,,m- 8,640 Ow.n s = 721 x 0.29 x (t,,,, - 70) = 209 t,,,m- 14,636 0,,n e = 800 x 0.29 x (t,,,m- 70) = 232t,,,m-16,240 0 3,gg = 1,604 t,,,m- 85,676 Heat Balance:

4,670 - (1,604 t,,,,n- 85,676)+ (860 x1.08 x 70) - (820 x1.08 x t,,,, ) = 0 4,670 - 1,604 t,,,, + 85,676 + 65,016 - 885.6 t,,,, = 0 2,489.6 t,,,m = 155,362 t,,,, = 62.4 F After sensible cooling, the final temperature of air of the voluma (V) becomes l

equal with the Fan Room temperature, t,,,, = T = 62.4 F, point 5 on the psychometric chart sheet 13, with the relative humidity 64% RH.

Therefore the relative humidity upstream of the charcoal filter in the Emergency Air Conditioning unit will not exceed 70% RH.

SCE 26 426 NEW 4/90

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EC&FS DEPARTMENT CALCULATION SHEET iCCN NO./

PRELIM. CCN NO. PAGE OF Project or DCP/FCN Cale No. M-0073-125 (("[U0 CCN subject _ RELATIVE HUMIDITY AT CHARC0AL BEDS (E-418&419) N0 OSA HEATING Sheet No. /Y REV CRIGINATOR DATE IRE lOATE llREV l CRIGINATOR lOATE l IRE DATE F. Udrea Gregovich IX. APPENDICES I

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