L-83-328, Forwards Summary of Calculations Performed to Determine Flood Level Inside Containment,In Response to NRC Request for Addl Info Re Util
| ML17213B396 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 05/25/1983 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| L-83-328, NUDOCS 8305270104 | |
| Download: ML17213B396 (8) | |
Text
RESULATORY IIORNATION DISTRIBUTION SYSl
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ACCESSION NBR ~ 8305270 1 00 DOC ~ DATE 83/05/25 NOTARIZED
-NO FAOIL:50 389 St ~ Lucie Plantg Unit 2E Flor ida Power 8 Light Co ~
AUTH~ NAME AUTHOR AFFILIATION UHRIGg R ~ E ~
Florida.Power 8 Light Co, REC IP ~ NAMF-RECIPIENT AFFILIATION EISENHUT~DBG.
Division of Licensing DOCKET 05000389
SUBJECT:
Forwards summary of calculations performed to determine flood level inside containmentiin nesponse to NRC request for addi info re util 830510 ltr, DISTRIBUTION CODE:
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Licensing Submittal: tPSAR/FSAR Amdts 8 Aelated Cour espondence NOTES:
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FLORIDAPOWER & LIGHT COMPANY May 25, 1983 L-83-328 Office of Nuclear Reactor Regulations Attention:
Mr. Darrell G. Eisenhut, Director Division of Licensing U.
S. Nuclear Regulatory Commission Washington, D.C. 20555 Deaq Mr. Eisenhut:
Re:
St. Lucie Unit No.
2 Docket No. 50-389.
Containment Floodin Calculation In response to a verbal request for additional information regarding our letter L-83-286 dated May 10, 1983, attached please find a summary of the calculations performed to determine the flood level inside containment.
This response should close out this issue.
Very truly yours, Robert E. Uhrig Vice President Advanced Systems
& Technology REU/RJS/cab Attachment
'8 co/
j/
8305270104 830525 PDR ADOCK 05000389 P
PDR PEOPLE... SERVING PEOPLE r
CONTAINMENT FLOODING CALCULATION
SUMMARY
J Ebasco has reviewed a previously performed Containment Flooding Analysis to verify that modifications to the Hydrogen Purge Exhaust Check Valve to prevent flooding of this valve are unnecessary.
The Hydrogen Purge Exhaust Cneck Valve is located at elevation 26'-0" with the bottom of the valve disc at elevation 25 '-7".
The flood level stated in FSAR Section 7.5.3.2 is 26'-0".
This conservative flood level was a reported value from an analysis done in compli-ance with the criteria of NUREG-0737 item II.F.1, Attachment 5
"Containment Water Level Monitoring" to give the range for',the Containment Level Monitor.
The analysis summarized here is to determine a conservative but more realistic value for the calcu-lated max imum water level.
The analysis was done in two parts.
The first part determined the free volume in the containment while the second part is a conserv-ative estimate of the water available to flood the containment in the event of an accident.
The containment free volumes were calculated by taking the total volume and subtracting the volume of the equipment present.
Table 1 shows the free volume of each area below elevation 18.
Table 2 shows the free volume below 24'nd above 18'.
Above elevation 24't was conservatively assumed that the volume increased at a constant rate of 11343 ft per ft of elevation.
Figure 1 shows the containment free volume versus elevation.
The inventory of water available for flooding the Containment is a conservative total based on the maximum quantity of fluids from the Reactor Vessel, Steam Generator, Pressurizer, Safety Injection Tanks and the Hydrazine Tank.
The volume of fluid contributed by each vessel is shown on Table 3.
The entire inventory of the Primary Coolant in the Reactor Vessel, Reactor Coolant Piping, Steam Generator, Pressurizer and Pressur-izer Surge Line (except a small amount of water in the Reactor Vessel, consistent with accident analyses in Chapter 15 of the FSAR) was assumed to spill onto the floor.
The Pressurizer was conservatively assumed to be water solid at the time of the accident.
'v All the Safety Injection Tanks were conservatively assumed to be at their maximum Technical Specification level (Tech Spec 3.5.1).
In addition, a conservative maximum inventory of the Boric Acid Make-Up Tanks, Refueling Water Tank and the Hydrazine Storage Tank was added to the containment.
The Refueling Water Storage Tank was conservatively assumed to be at the overflow level.
This is 7,300 gallons above the high level alarm and 67,000 gallons above the Tech Spec limit.
The conclusion of this reanalysis is that the actual maximum calcu-lated flood level inside containment is elevation 25'-3" as shown in Figure 1, not elevation 26'0" 'reported for NUREG-0737, item D.F.1.
This actual level is below the 25'-7" at the bottom of the Hydrogen Purge Exhaust Check Valve, therefore no modifications are necessary.
TABLE 1 CONTAINMENT FREE VOLUME BELOIU EL 18-0 PT Vol Index Description Free Volume Ft 10 12 Containment Sump Reactor Cavity Electrical Tunnel Elec. Tunnel Access.
Blowout Tunnel R. Drain Tank Pit ECCS Pump Suction Trenches gl to 6
Annular Trenches Stairways Regen HX Cubical Eq
& Fl Drains Total Below El.
18 1431 4807 5560 1732 2207 1600 143 2289 6226 199 78 82 26359
TABLF. 2 CONTAINMENT FREE VOLUME BETWFEN FL 18 FT and 24 FT Vol Index Descrirtion
'QEl 19 ft Free Volume Ft3 QFl 20 ft QEl 21 ft PFl 22 QF1 23 ft QEl 24 ft 10 12 Reactor Cavity R Drain Tank Pit Annular Trenches Stairways Regen HX Cubical Eg
& Fl Drains 144 187 1313 26 43 144 187 1313 33 43 144 187 1313 40 43 144 187 1105 44 43 144 187 853 52 43 104 13 Reactor Fl above EL 18 5178 5178 5178 5730 6284 12848 14 15 16 17 18 19 Trenches N769 2nd Shield Wall Shield Wall SG Support Pads Press.
Support Pad RCP Bottom Stops
-811
-142
-420
-171
-171 16
-811
-142
-420
-171
-171 48
-811
-142
-420
-171 61 48
-811
-142
-420
-171
-61 48
-811
-142
-420
-171 56
-811
-142
-105
-171
-48 20 Fquipment Pads
& Curbs 67
-225 Total cu. ft p
Cumulative Total 5109 31468 5200 36668 5349 42017 5697 47714 6012 53726 11343 65069
TABLE 3 Water Inventory and Flood Level I)
Containment Vol.
a)
Containment free vol 8 EL 24' 65,069 FT b)
Containment free vol 9 EL 25' 76,412 FT3 c)
Containment free vol 9 EL 26' 87,755 FT Calc.
2 Water Inventory 6 Flood Level a)
From Refueling Uater Tank b)
Reactor Vessel c)
R C.
Pumos d)
Pressurizer f)
R.C. Piping g)
Safety Injection Tanks h)
Boric Acid Ãakeuo Tanks i)
Hydrazine Tank 64770 cu ft 1695 448 3245 800 1081 6224 883 90 Total Inventory 79245 cu ft Flood Level Intropolation between EL 24' 25'or 79245 cu ft of water qives a
flood level at EL 25.25 ft.
i9 FO DUO I