ML041420216

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Email from SQN Responding to RAI Re 50.68 Exemption (MC1871/72)
ML041420216
Person / Time
Site: Sequoyah  
Issue date: 04/29/2004
From: James Smith
Tennessee Valley Authority
To: Marshall M
Office of Nuclear Reactor Regulation
References
TAC MC1871, TAC MC1872 EPM-PDM-031294, SQN-78-DO54
Download: ML041420216 (5)
v • d • e


Text

I Michael Marshall - 50.68 Exemption Page 1l I Michael Marshall - 50.68 Exemption Paae I I From:

"Smith, James D." <jdsmith~tva.gov>

To:

"Michael Marshall <MXM2@nrc.gov>

Date:

4/29104 5:00PM

Subject:

50.68 Exemption From today's telecon, we needed to address 3 questions:

1.

What frequency will be used by operations in lieu of a trained monitor for operator rounds in the event that no cask loading crew personnel are not in the refueling floor area?

2.

What is the flow rate for spent fuel pool cooling discharge lines?

3.

Will the discharge flow line valve to the cask pit area be open?

In response to these questions:

1.

every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />... normal frequency is once per shift (12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />)

2.

the attached portions of TVA calculation SQN-78-D054 EPM-PDM-031294 shows a spent fuel pool flow rate of 1997 gpm and a cask pit flow rate of 183 gpm

3.

in accordance with 0-S0-78.1, Att. 5, the discharge flow line valve to the cask pit area is independently verified to be open Jim Smith Licensing Supervisor Sequoyah Nuclear Plant 423-843-6672 pager 40442 CC:

"Kitts, Zachary T.", <ztkitts@tva.gov>, "Rinne, Jeffrey H." <jhrinne@tva.gov>, "Gillman, Marie" <mgillman tva.gov>, "Reynolds, Jerry R." <jrreynolds tva.gov>, "Laurie, George M."

<gmlaurie5 @ tva.gov>

O1GIL QA R~ecord TVAN CALCULATION COVERSHEET Title Page 1

of SQN SPENT FUEL POOL COOLING SYSTEM HYDRAULIC ANALYSIS Plant SQN Unit 112 Preparing Organization Key Nouns (For RIMS)

SQN-MN/E SPENT FUEL POOL, ORIFICE, DIFFUSER, NPSH 8ranch/Project Identifiers Each time these calculations are Issued, preparer must ensure that the original (RO)

RIMS accession number is filled In.

SQN-78-D054 EPM.PDM-031294 Rev (for RIMS use)

RIMS Accession Number Applicable Design Document(s)

RO 940711G0034 B87940706005 SQN-DC-V-33.0 Ri

'941128G0042 887941122002 SAR affected:

lUNID System(s)

R2 8 7 9 8 0 5 0 7 0 0 2 EQYes 0No

___7__

Section(s):

078 R

Rev 0 RI R2 R

Ouality Related?

Yes No Design Change Document DCN M08736A DCN M13274A Safety retated?

Yes No No: (or Indicate Not Applicable) DCN M08736A Prepared

.-. T-u These calculatIons contain Yes No P. D. Maddux P. D. Maddux AMWashingon unveified assumption(s) that 0

[

____m ust be verlfied later?0 Checked Y

These calculations contain Yes No T. P. Wooten T. P. Wooten

/1JF Lund special requements and/or 0

T.______P.

______Wooten___________limiting conditioMs?

SE Reviewed

. MF dThese calculations contain a Yes No V. A. Blanco

d.

M. Lafever v JFLund Cesign output attacdment?

o o

Approved c alculation RevisIon:

R2 MM. J. Lorek

. J. Lorek En cacutation Date 10/5/94 Selected pages p

June 6. 1994 1

10 Not Applicable n

Statement of Problem:

Determine the Impact of removing the spent fuel pool cooling system diffuser on system hydraulics and determine the impact of utilizing a 3.- flow reduction orifice on SQN system performance. Determine size of new flow restricting orifice. Define pump flow acceptance criteria.

IC J,

Abstract A computer model (EZFLOW) was developed for the SON Spent Fuel Pool Cooling System to determine the affects of removing the SFP cooling system diffuser from the SFP, allowing additional space for the spent fuel storage racks. The calculation also determined the relative Impact on system flow should the SFP cooling system 4.14" flow reduction orifice be replaced with one sized 3.8' (size used at WBN). The maximum change In pump flow during single train operation due to removal of the diffuser will be 1 gpm. The affect on total system flow as a result of replacing the 4.14" orifice with on sized 3.8-Is a 454 gpm reduction.

Maximum SFP temperature allowed without Incurring Inadequate NPSH for the SFPC system pumps was determined to be 192F, for normal SFP water level.

Revision 2 Increases the size of the orifice to 4.60-. The 4.14" orifice was sized based on flow data from the Incorrectly sized SFP annubarlflowmeter which was designed at the SFPCS design temperature Instead of the normal operating temperature as documented In PER SQ950458PER. The 4.60" orifice Is sized based on a 5% degraded pump condition to achieve 2300 gpmlSFPC cooling loop when two cooling loops are in service.

The pump flow acceptance criteria Is that the SFPC system must pass 1.14 x 1 0 Ibm/hr per train for dual pump operation when all In line valves are open. The mass flow rate of 1.14 x 104 Ibmlhrls equivalent to 2300 gpm at 11SF.

0 Microfilm and return calculation to Calculation Library.

l Microfilm and destroy.

0 Microfilm and return calculation to:

OPS 1B SON A 40532 8.J Pa g e 1 nD 1

IVA 40532 108-97]

Page 1 of 3 NuED-2-1 LUG-VJ-z7JI

TVA CALCULATION SHEET Document:

SQN-78-DO54 Rev: 2 Plant: SQN UNITS I Page:

G EPM-PDM-031294

& 2 t

N SN F I

Subject:

SQN SPENT FUEL POOL COOLING Prepared By: lt2 Date:

s-Y SYSTEM HYDRAULIC ANALYSIS Checked By:

Date:6 de TABLE OF CONTENTS CALCULATION COVER SHEET................................................. 1I REVISION LOG..................................................

2 CALCULATION DESIGN VERIFICATION FORM (INDPEN. REVIEW).............................. 3 CALCULATION CATEGORIZATION FORM..................................................

4 TABLE OF CONTENTS..................................................

6 1.0 PURPOSE..................................................

7 2.0 CRITERIA..................................................

7 3.0 APPLICABLE CODES AND STANDARDS..................................................

7 4.0 ASSUMPTIONS..................................................

8

5.0 REFERENCES

8 6.0 DESIGN INPUT DATA.................................................

10 7.0 CALCULATIONS.................................................

11 8.0

SUMMARY

OF RESULTS.................................................

17

9.0 CONCLUSION

S...................................................

17a 10.0 REQUIREMENTS/LIMITING CONDITIONS.................................................

17a Figure 1 - SQN SFPC System EZFLOW Node Diagram................................................. 18 ATTACHMENTS:

1. EZFLOW RUN WITH ONE SFP PUMP RUNNING (WITH DIFFUSER, 4.14" ORIFICE) - 24 pp
2. EZFLOW RUN WITH ONE SFP PUMP RUNNING (WITHOUT DIFFUSER, 4.14" ORIFICE) - 24 pp
3. EZFLOW RUN WITH TWO SFP PUMPS RUNNING (WITHOUT DIFFUSER, 4.14" ORIFICE) - 23 pp
4. EZFLOW RUN WITH TWO SFP PUMPS RUNNING (WITHOUT DIFFUSER, 3.8" ORIFICE) - 23 pp
5. EZFLOW RUN WITH TWO SFP PUMPS RUNNING (WITHOUT DIFFUSER, 4.99" ORIFICE) - 23 pp
6. EZFLOW RUN WITH ONE SFP PUMP (C) RUNNING (W/O DIFF, 4.60" ORIF) -FOR NPSH - 25 pp
7. EZFLOW RUN WITH TWO SFP PUMPS RUNNING (WITHOUT DIFFUSER, 4.60" ORIFICE) -23 pp
8. EZFLOW RUN WITH ONE SFP PUMP RUNNING (WITHOUT DIFFUSER, 4.60" ORIFICE) - 24 pp APPENDIX:

A. Spent Fuel Pool Cooling Pump - Westinghouse Pump Curve - 1 page B. Magazine article: "Eliminating cavitation from pressure-reducing orifices" (Ref 5.20) - 3 pp C. Johnson Screen: Pressure Drop Calc for SFPC System intake strainers.

THIS CALCULATION CONTAINS All1 TOTAL SHEETS.

CALCULATION SHEET Document:

EPM-PDM-031 294 lTRev:

1 lPlant: SQNUNrTS1&2jPage:. 1 8 1

Subject:

SQN SPENT FUEL POOL COOLING PreparedBy:10M Date:

]

SYSTEM HYDRAULIC ANALYSIS Checked By: 2LJ Date: J/57 FIGURE 1 SQN SFP COOLING AND CLEANING SYSTEM EZFOW NODE DIAGRAM Staton Drainage NOTE: Nodes 12c,13c,14cand 16c used only for Atachment 6.

Nodes 12a,2a,16aGa are not used for Attachment 6.

Date: 05/31/94 CTue)

Time: 1638 11 Page L

of EZFLOW:,Version 3 QA site: unspecified SQ-78-2.NET: SFP,ONE TRAIN,W/O DIFFUSER,(4.14 ORF), EPMPDMO31294 ATTACH 2

TVA AUTHORIZED USE ONLY ---------------------------

SUMMARY

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