ML20112A562
| ML20112A562 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 03/27/1996 |
| From: | WOLF CREEK NUCLEAR OPERATING CORP. |
| To: | |
| Shared Package | |
| ML20112A550 | List: |
| References | |
| GK-474, GK-474-R01, GK-474-R1, NUDOCS 9605210346 | |
| Download: ML20112A562 (5) | |
Text
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" FORM APF$0$D-00101. REV.00
. CALC NO. GK474 ,
CALCULATION COVER SHEET ocp,cep go, N/A NgcH Auic A t SHEET 1 OF 5 CALCULATION STATUS PRELIMINARY COMMITTED X FINAL SUPERSEDED VOIDED DESIGNATION:
CLASSIFICATION: X SAFETY-RELATED SPECIAL-SCOPE NONSAFETY-RELATED COMPUTER CODE / VERSION:
N/A CALCULATION Contol Room Pressurization System Filtration Unit Heater Output
SUBJECT:
DESCRIPTION / REVISION
SUMMARY
Revision 1 of this calculation is issued to incorporate a Technical Specification change. The KW output of the heater is reduced from 15 KW to S KW output by DCP 05760.
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PURPOSE:
The purpose of this calculation is to demonstrate the minimum and maximum allowable control room pressurization system filtration unit (FGK02A/B) heater capacity.
REFERENCES:
- 1. WCGS Technical Specification 3/4 7.6
- 2. ANSI N-509-76
- 3. Calculation XX-E-006, " Wolf Creek Degraded Voltage Calculation' INPUTS:
- 1. The heater must reduce the entering air relative humidity from 100% to 70%.
1
- 2. Summer design inlet air temperature = 97*F DB I
- 3. The off-coil temperature must be limited to 225'F to meet criteria from ANSI N-509. 1
- 4. The pressurization fan will deliver 750 CFM +/- 10%.
- 5. The normal electrical bus voltage is 460 volts. The minimum degraded voltage at the heater is 432 volts from Ref. 3.
ASSUMPTIONS:
- 1. The maximum voltage will be assumed to be 10% above the normal value (460 x 1.1 = 506 volts).
- 2. At the winter outdoor air conditions the air has extremely low moisture content. The amount of heat input required to lower the relative humidity from 100% to 70% in winter is insignificant when compared to the summer time conditions. The summer time design conditions is the l
controlling case.
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- FORM APF-05D-00103.REV.00 CALC NO. GK.474 CALCULATION SHEET ,,,,, , o, i l
[ SHEET 3 OF 5 l
l ANALYSIS:
- 1. Maximum Allowable Heater KW:
CFM = 750 - (750 x 0.1) = 675 CFM '
Tmtry = 97'F DB l Torr.coet= 225'F DB I l
V = 506 volts l Q = 5 KW +/- 1 KW Maximum heater output at 506 volts (assuming max. output at 460 volts is 6 KW).
(V2Ni)2 (KW i) = (KW2)
(506/460)2 (6) = (7.26 KW)
Heater output resulting if air flow is minimum and off-coil temperature is limited to 225'F DB.
Q = (1.08) (CFM) (AT)
Q = (1.08) (675) (225 - 97)
Q = 93,312 BTU /HR x (1 W) / (3.4129 BTU /HR) = 27,341 W = 27.341 KW Therefore, an off-coil temperature of 225'F DB would never be achieved with a 5 KW +/- 1 KW heater rating. Wolf Creek is in compliance with this ANSI N-509 requirement.
II. Minimum Heater KW Requirements:
A. Based on minimum degraded voltage of 432 volts and minimum heater output of 4 KW.
The minimum heater output ava!!able:
(V2Ni)2 (KW i ) = (KW2)
V2= 432 volts (Ref. 3) j l KWi = 5 KW-1 KW = 4 KW (432/460)2 (4) = (3.53 kW)
Therefore the minimum possible heater output is 3.53 KW.
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- FORM APF'-05D.C31-02. REV. O CALC NO. GK-474 CALCULATION SHEET ,,y,3,ou uo, i SHEET 4 OF 5 B. The minimum required heater output to reduce 97 deg. F (DB) inlet air from 100% to 70% RH:
Q = (1.08) (CFM) (AT)
Where, CFM = 750 + (750 x 0.1) = 825 CFM Te = 97*F DB Temt= 109 F DB (From psychometric chart: this is the resulting DB temperature) 1.08 = C, x p (air) j Q = (1,08) (825) (109 - 97) = 10,692 Blu/Hr x (1 W) / (3.4129 BTU /HR) = 3,132.82 W = 3.13 KW From part A above a minimum of 3.53 KWis available from the heater. This is greater than the 3.13 KW required.
Conclusion:
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A rating of 5 KW +/- 1 KW is adequate to reduce inlet air to 70% RH as required by ANSI N509.
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