ML072550247
| ML072550247 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 03/27/2006 |
| From: | Exelon Corp |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| GNRO-2007/00061 M6.7.013, Rev. 1 | |
| Download: ML072550247 (1) | |
Text
Attachment 5 To GNRO-2007/00061 GGNS Calculation M6.7.013, Rev. 1
I CALCULATION COVER PAGE CALCULATION LiDRN M;' DRN No.
Page(s (2) Initiating Doc.:
ER-GG-1999-0217
[] DRN Superseded:
[0 DRNs Voided:
Ei Calculation Superseded/Voided:
Z As-Built/No ICN Required El PendingIICN Required (Verify current status In IDEAS.)
)12 (3) Reason For Pending Status: (ER, T.S., Change, etc.)
(41 Calculation No: M6.7.013 7
-Revision: 1 "I
Title:
CONDENSATE STORAGE TANK RESERVE CAPACITY 1' System(s): P11
(") Component/Equipment Identifier:
'~' Safety Code:
"li' Calc Code:
1PIlAO02
] Yes (ANO/GGNS Only)
Li Quality MechSys I-] No (20)Study Calc
-] YES [
NO I1) 10CFR50.59 Review:
(
Structure: (Optional)
Z Addressed in:
Bldg.
Elev.
ER-GG-1 999-0217
[3 Attached Room Wall L-No LBD Impact Coordinates:
"'i R-Type: J05.02, CALCULATION 114) Org. Code: (ANO/GGNS/RBS Only) NPE-Mechanical
'I' Keywords: CST "i' Topical Codes: (ANO Only)
REVIEWS
&WAQQ~13-27-0t,,
(16) Na Tea/Sgnature/Date (17) Name/Signature/Date Narne/Signajurp/Date A..
Robert Fuller Aiex Oward Design Verifier s/*pnl Responsible Engineer
-- Reviewer Supervisor/Approval El Checker (Only As-Built DRNs Included in Revision)
El Comments Attached i
Comments Attached
-Entergy CALCULATION NO.
CALCULATION SHEET M6.7.013 SHEET ii OF REV.
1 CALCULATION CALCULATION NO: M6.7.013 REFERENCE SHEET REVISION:
I I.
DRNs INCORPORATED:
1.
2.
3.
4.
5.
II Relationships:
Sht Rev Input Output Impact DRN/
Doc Doc Y/N Tracking No.
- 1. ER-GG-1999-0217 0
0 0
N_....
- 2. C-143.0-NIP1 1A002-1.3-2-3 N
- 3. C-1 43.0-NIPI 1A002-1.3-17-2 El
_ N
- 4. C-143.0-NIP11A002-1.3-16-2
[]
[]
N
- 5. C-143.0-NIP11A002-1.3-18-2
_]
,._[_
N
- 6. J-1660B 0
4 0
0 N
05-1560
- 7. SDC-E22 0
2 0_
N
- 8. SDC-E51 0
2 N
- 9. MC-QIE22-00010 0
1El_
1"0 N
III.
CROSS
REFERENCES:
1.
2.
3.
IV.
SOFTWARE USED:
Title:
Version/Release:
Disk/CD No.
DISKICDS INCLUDED:
Title:
Version/Release Disk/CD No.
V.
OTHER CHANGES:
Entergy CALCULATION NO.
CALCULATION SHEET M6.7. 013 SHEET iii OF
(
REV.
1 Revision
'o14v~
Initial issue.
0 Determines available CST volume at a level of 18 feet (TS level) above bottom of tank as well as 18.9 feet (HPCS/RCIC reserve volume), 22 feet (low 1
alarm), 25 feet (normal level), and 29.1 feet (high alarm) above bottom of tank.
-II
Entergy CALCULATION SHEET SHEET~hOF____
CALCULATION NO. M6.7.013 REV.
I TABLE OF CONTENTS FRONT MATTER PAGE CALCULATION COVER PAGE i
CALCULATION REFERENCE SHEET ii RECORD OF REVISION iii TABLE OF CONTENTS iv LIST OF EFFECTIVE PAGES v
LIST OF TABLES vi SECTION 1.0 PURPOSE 1
2.0 CONCLUSION
1 3.0 INPUT AND DESIGN CRITERIA 2
4.0 ASSUMPTIONS 2
5.0 METHOD OF ANALYSIS 2
6.0 CALCULATIONS 3
Entr,Eng CALCULATION SHEET CALCULATION NO. M6.7.013 SHEETy _
OF 6
REV.
I LIST OF EFFECTIVE PAGES PAGE No.
REVISION ii 1
iii 1
iv 1
V I
vi I
2 1
3 1
4 1
5 1
6 1
A.
SEn tergy CALCULATION SHEET CALCULATION NO. M6.7.013 H-EET vi RIEVJ.L LIST OF TABLES Table I: Usable CST Volume for HPCS/RCIC................................................ 1 Table II: Flow Data from Engineering Calculation MC-QIE22-00010, Rev I......
4
SEntergy CALCULATION SHEET CALCULATION NO. M6.7.013 SHEET I
OF 6
REV.
I II 1.0 PURPOSE The purpose of this calculation is to determine the available usable Condensate Storage Tank volume at a level of 18 feet, 18.9 feet, 22 feet, 25 feet, and 29.1 feet from the bottom of the tank and the time to the suction swap or vortexing for various HPCS/RCIC pump flow rates.
2.0 CONCLUSION
This calculation provides the available Condensate Storage Tank volume at a level of 18 feet, 18.9 feet, 22 feet, 25 feet, and 29.1 feet from the bottom of the tank and the time to suction swap or vortexing (setpoint for suction swap "Disabled") for various HPCS/RCIC pump flow rates. The results are listed in Table I.
Table I: Usable CST Volume for HPCS/RCIC (time before suction swap or vortexing, assuming continuous flow)
FLOW Setpoint*
18 ft*
18.9 ft*
22 ft*
25 ft*
29.1 ft*
(gpm)
(ft)
TS Level stand pipe level low alarm min normal high alarm (HPCS/RCIC level reserve volume) 800 Disabled 169,000 gal 177,000 gal 206,000 gal 235,000 gal 273,000 gal (RCIC)
(See Note)
(3.5 hr) 3.7 hr (4.3 hr)
(4.9 hr)
(5.7 hr) 7115 Disabled 145,000 gal 154,000 gal 183,000 gal 211,000 gal 250,000 gal (HPCS)
(See Note)
(20 min)
(22 min)
(26 min)
(30 min)
(35 min) 8175 Disabled 137,000 gal 145,000 gal 174,000 gal 203,000 gal 241,000 gal (HPCS)
(See Note)
(17 mi) nm)
(21 min)
(25 min)
(29 min) 8975 Disabled 130,000 gal 138,000 gal 168,000 gal 196,000 gal 234,000 gal (HPCS/
(See Note)
(14 min)
(15 min)
(19 min)
(22 min)
(26 min)
RCIC) 800 4.0 135,000 gal 143,000 gal 172,000 gal 200,000 gal 239,000 gal (2.8 hr)
(3.0 hr)
(3.6 hr) 4.2 hr)
(5.0 hr) 800 5.0 125,000 gal 134,000 gal 163,000 gal 191,000 gal 230,000 gal (2.6 hr) -
(2.8 hr)
(3.4 hr)
(4.0 hr)
(4.8 hr) 7115 5.0 107,000 gal 115,000 gal 145,000 gal 173,000 gal 211,000 gal (15 min)
(16 min)
(20 min)
(24 min)
(30 m) 8175 5.0 100,000 gal 109,000 gal 138,000 gal 166,000 gal 204,000 gal (12 min)
(13 min)
(17 min)
(20 min)
(25 min) 8975 5.0 94,000 gal 103,000 gal 132,000 gal 160,000 gal 199,000 gal 1
(10 min)
(11 min)
(15 min)
(18 min)
(22 min)
Entery CALCULATION SHEET SHEETIOF 6
CALCULATION NO. M6.7.013
-REV.
I
- Indicated level; actual level is 1V-1" higher. Usable volume does not specifically include an allowance for instrumentation/setpoint uncertainty. The effect is expected to be small and bounded by the conservatism in the assumed instrumentation response times and valve stroke times.
Note: Evaluation of usable CST volume before vortexing begins (transfer switch disabled or fails).
3,0 INPUT AND DESIGN CRITERIA
- 1.
Condensate Storage Tank (CST) set point levels are in accordance with Drawing J-I 660B, DRN 05-1560.
- 2.
The minimum reserve volume level given by Technical Specification 3.5.2.2 is >_ 18 feet.
- 3.
The design criteria for the High Pressure Core Spray (HPCS) pump flow rate given by SDC-E22, is 7115 gpm with the reactor vessel pressure 200 psi above the pressure at source of suction, with a maximum runout flow into the reactor with a pressure vessel of 14.7 psia of 8175 gpm.
- 4.
The design normal flow rate for the Reactor Core Isolation Cooling (RCIC) pump is 800 gpm.
- 5.
The values for friction loss, minimum CST level instrumentation response time and valve stroke time, and potential vortex level above vortex breaker are derived in Engineering Calculation MC-Q IE22-00010, Rev 1.
- 6.
All CST measurements are derived from Specification C-143.0, NIPI 1A002.
4.0 ASSUMPTIONS
- 1.
All calculations for flow rate and time assume continuous flow.
- 2.
Normal CST level is 25-29 feet.
- 3.
The CST standpipes are right circular cylinders.
5.0 METHOD OF ANALYSIS The available usable volume in the CST is a function of CST initial and set point level, instrumentation and valve response time, and piping friction losses. For any given initial CST level, the available usable volume in the CST is the amount of water above the actual vortex breaker after the HPCS/RCIC suction valve opens minus the volume of water displaced by the CST standpipes.
Entergy CALCULATION SHEET SHEET 3
OF 6
CALCULATION NO. M6.7.013
-REV.
I 6.0 CALCULATIONS Given a diameter of 40 ft (Ref 1), the volume of the CST per foot is:
n
_ n.(4oft)2 = 9400.3gal 4
4 ft Now calculate the height at which a reserve volume of 170,000 gallons is provided.
Reservev ol
= 18.0841 9400.3 gal ft Factor in the level of the vortex breaker (0.75 feet), and the level required for a reserve volume of 170,000 gallons is:
ReserveVoIHeight = 18.081 + 0.75ft = 18.833
-18.9 feet The actual level of the vortex breaker is the difference between the instrument level zero and the level of the vortex breaker, or:
Level of vortex breaker = 9" Instrument zero level = I '-1" VortexLevel = 13in - 9in = 0.333f1 The height of each of the standpipes is the difference between the centerline height of the standpipe and the cross-sectional radius of the standpipe, minus instrument error. The height of the 12 inch diameter standpipe is:
Height I 2stdpipe = (5.229A - 0.53 Ift - 1.083fi) = 3.615M The height of the 10 inch diameter standpipe is:
Hcight IOstdpipe = (5.22S/t - 0.448l - 1.083f) = 3.698 Engineering Calculation MC-Q I E22-000 10, Rev 1, calculates the friction loss (FL),
minimum CST level instrumentation response time and valve stroke time (RTmin), and potential vortex level above vortex breaker (VTX) for the HPCS/RCIC pump at rated flow, shown in Table II.
Entergy CALCULATION SHEET CALCULATION NO. M6.7.013 SHEET 4
OF 6
REV.
I FLOW FL RTmin VTX (gpm)
(ft) ft)
(t) 800 0.041 0.0675 N/A 7115 2.738 0.811 2.504 8175 3.592 0.932 3.746 8975 4.313 1.000 4.177 Table II. Flow Data from Engineering Calculation MC-QIE22-00010, Rev 1 The CST contains four standpipes (3-12" diameter standpipes and 1-10" diameter standpipe) which displace a known volume of usable water. This displaced volume is accounted for by calculating the expected volume per standpipe for a given indicated level, accounting for instrument zero. The volume of each standpipe is calculated as a right circular cylinder using the nominal cross-sectional area (Reference 4). With the low level set points disabled, the displaced volume for each the 3-12 inch diameter standpipes and the 1-10 inch standpipe is:
Volume 2displaced = 3"(nR1 2stdpipe 2). H 12stdpipe + 3"( n'Rl tdpipe 2)Wstdpipe Volume I %isplaced = (n.R 0stdpipe 2).HI 0stdpipe + (7r. RI0stdpipe 2) *Wstdpipe TotalVolumedisplace = Volume I 2displaced + Volumel tdisplaced where: H I 2stdpipe is the height of the 12 inch diameter standpipe's vertical section accounting for instrument zero and indicated level (see Row 1, Table 1) minus the potential vortex level (Table II) r H 1;tdpipc = ('LevCl - 3.615-VrX)
H IOstdpipc is the height of the 10 inch diameter standpipe's vertical section accounting for instrument zero and indicated level (see Row 1, Table I) minus the potential vortex level (Table II)
HIOstdpipe = (ILevel - 3.698-VTX)
Wstdpipr is the height of the standpipe's horizontal section (1.469 ft)
Rl2stdpipe is the cross-sectional radius of the 12 inch standpipe (0.531 ft)
RIOstdpipe is the cross-sectional radius of the 10 inch standpipe (0.448 ft)
Entergy CALCULATION SHEET SHEET L OF 6
CALCULATION NO. M6.7.013 REV.
I Therefore, the total usable volume in the CST with the low level set points disabled is:
VoLCST = ( Level - VTX).9400.3a - TotalVolumedisplace ft where: IL.Avel is the indicated level (Row 1, Table I)
VTX is the potential vortex level above vortex breaker (Table II)
Similarly, with the low level set points enabled, the displaced volume for each the 3-12 inch diameter standpipes and the 1-10 inch standpipe is:
Volumel t displaced 3,
3(1n.R1 tdpipe) 2)HI 2stdpipe + 3, (1t-I2stdpipe 2). Wstdpipe Volume I 0Jisplaced
( (i1Rl0stdpipe 2 ) 11 stdpipe + (n.Rlostdpipe2),Wstdpipe TotalVolumedisplace = Volumei'tisplaced + Volumelqiisplaced where: H12stdpipc is the height of the 12 inch diameter standpipe's vertical section accounting for instrument zero and indicated level (see Row 1, Table I)
H Istdpipe = (ILeveI - 3.615-SP - FL + RTmi,)
H lI stdpip. is the height of the 10 inch diameter standpipe's vertical section accounting for instrument zero and indicated level (see Row 1, Table I)
H1Ostdpipe = (ILevel - 3.698-SP - FL + RTmiiJ Wgdpip is the height of the standpipe's horizontal section (1.469 ft)
R12 stdpip, is the cross-sectional radius of the 12 inch standpipe (0.531 ft)
Rl 0stdpip. is the cross-sectional radius of the 10 inch standpipe (0.448 ft)
Therefore, the total usable volume in the CST with the low level set points enabled is:
VOLCST: ['~ev
+ Vorie:xtevel-(SP + FL - RTmin)].9400.3-!
- TotalVolumedisplace where: ILevel is the indicated level (Row 1, Table 1)
VorteXLCvel is the actual vortex level (0.333 ft)
Entergy CALCULATION SHEET SHEETJjOF CALCULATION NO. M6.7.013 REVJ, I SP is the CST low level set point for HPCS/RCIC suction transfer (Column 2, Table I)
FL/RTmin are taken from Table II for various flow rates Total Volumedisl.ac is the total volume displaced by all four standpipes The time allowed before swapping to HPCS/RCIC or vortexing is calculated by dividing the usable CST volume by the flow rate for a given mode (HPCS pump, RCIC pump, combination of both).
Time Flowrate Results of various pump flow rates and CST initial and set point levels is provided in Table I in the CONCLUSION section.