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| number = ML063130442
| number = ML063130442
| issue date = 11/22/2006
| issue date = 11/22/2006
| title = Sequoyah, RAI, Technical Specification Change Request for Ultimate Heat Sink
| title = RAI, Technical Specification Change Request for Ultimate Heat Sink
| author name = Pickett D V
| author name = Pickett D
| author affiliation = NRC/NRR/ADRO/DORL/LPLII-2
| author affiliation = NRC/NRR/ADRO/DORL/LPLII-2
| addressee name = Singer K W
| addressee name = Singer K
| addressee affiliation = Tennessee Valley Authority
| addressee affiliation = Tennessee Valley Authority
| docket = 05000327, 05000328
| docket = 05000327, 05000328
Line 18: Line 18:


=Text=
=Text=
{{#Wiki_filter:November 22, 2006Mr. Karl W. SingerChief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801
{{#Wiki_filter:November 22, 2006 Mr. Karl W. Singer Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801


==SUBJECT:==
==SUBJECT:==
SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 - REQUEST FORADDITIONAL INFORMATION REGARDING TECHNICAL SPECIFICATION CHANGE REQUEST FOR ULTIMATE HEAT SINK TEMPERATURE (TAC NOS. MD2621 AND MD2622)
SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING TECHNICAL SPECIFICATION CHANGE REQUEST FOR ULTIMATE HEAT SINK TEMPERATURE (TAC NOS. MD2621 AND MD2622)


==Dear Mr. Singer:==
==Dear Mr. Singer:==


By letter dated July 12, 2006, the Tennessee Valley Authority (TVA, the licensee) submittedTechnical Specification Change Request, Section 3.7.9.1, "Ultimate Heat Sink (UHS)
By letter dated July 12, 2006, the Tennessee Valley Authority (TVA, the licensee) submitted Technical Specification Change Request, Section 3.7.9.1, Ultimate Heat Sink (UHS)
Temperature Increase and Elevation Changes," for Sequoyah Nuclear Plant, Units 1 and 2.
Temperature Increase and Elevation Changes, for Sequoyah Nuclear Plant, Units 1 and 2.
This revision will change the minimum UHS water elevation in Section 3.7.5.a from 670 feet to 674 feet. The essential raw cooling water temperature requirement in Section 3.7.5b will be increased from 83 degrees Fahrenheit (°F) to 87 °F.In order for the staff to complete its review of the information provided by the licensee, werequest that TVA provide responses to the enclosed request for additional information (RAI).
This revision will change the minimum UHS water elevation in Section 3.7.5.a from 670 feet to 674 feet. The essential raw cooling water temperature requirement in Section 3.7.5b will be increased from 83 degrees Fahrenheit (°F) to 87 °F.
Based on discussions with your staff, we understand that you plan to respond to the enclosed RAI within 60 days of receipt of this letter. If you have any questions about this material, please contact me at (301) 415-1364.Sincerely,/RA/Douglas V. Pickett, Senior Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket Nos. 50-327 & 50-328
In order for the staff to complete its review of the information provided by the licensee, we request that TVA provide responses to the enclosed request for additional information (RAI).
Based on discussions with your staff, we understand that you plan to respond to the enclosed RAI within 60 days of receipt of this letter. If you have any questions about this material, please contact me at (301) 415-1364.
Sincerely,
                                                        /RA/
Douglas V. Pickett, Senior Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-327 & 50-328


==Enclosure:==
==Enclosure:==
Request for Additional Informationcc:  See next page 


ML063130442NRR-088OFFICELPLI2-2LPL2-2/PMLPL2-2/LAEGCB/BCLPL2-2/BC (A)NAMEJPaigeDPickettRSolaRKaras assigned onDPickett (A)LOlshan forDATE11/ 20 /06  11/ 21 /06 11 / 20 /06 10 / 30 /06    / 11/22 /06
Request for Additional Information cc: See next page


EnclosureREQUEST FOR ADDITIONAL INFORMATIONSEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2, TECHNICAL SPECIFICATION CHANGE REQUEST FOR ULTIMATE HEAT SINK TEMPERATURE DOCKET NOS. 50-327 AND 50-3281.While the applicant assumed a Chickamauga earthdam breach width of 400 feet whichis about 5 times dam height as suggested by the U.S. Bureau of Reclamation (1998), arecent study by Wahl (2004; "Uncertainty of Predictions of Embankment Dam BreachParameters," ASCE J. of Hydraulic Engr. V.130, No. 5) argued that the uncertainties in breach width estimates are widely recognized to be large. For large storage dams, breach width is a function of both breach height and reservoir storage volume.
ML063130442                                                      NRR-088 OFFICE      LPLI2-2      LPL2-2/PM          LPL2-2/LA        EGCB/BC        LPL2-2/BC (A)
Therefore, the applicant should consider both breach width and storage volume in estimating breach width. It is expected that the licensee's estimate of breach width will consider reasonable assurance for protection of ultimate heat sink (UHS) volume and intake head.2.Please clarify that there is enough margin to ensure the provision of "at least 4 hours ofriver level above 670 feet following a loss of downstream dam" considering the uncertainty in the reservoir recession (drawdown) curves (Graph on Page E1-15) caused by the uncertainty in estimating breach width.3.Please revise the recession curves in Page E1-15 by taking into account the backwatereffect at the Sequoyah Nuclear Plant emergency raw cooling water intake site, which is located about 14 miles upstream of Chickamauga Dam.4.For the staff to perform its confirmatory analysis, please provide input, output, andsource code of the simulated open channel hydraulics model used to construct the tailwater rating curve at the Chickamauga Dam site.5.While the initial pool level of the Chickamauga reservoir is very sensitive to the rate ofreservoir recession, the applicant should justify the use of an initial pool level of 680 feet in simulating reservoir recession curves. Or, please explain why one of driest/wettest water levels should not be used as an initial condition to be conservative.6.Page 4 in reference #8 of Enclosure 1 states that "the reservoir levels are lower at othertimes of the year, but the ultimate heat sink limit is not approached during this time,"
NAME        JPaige        DPickett            RSola            RKaras as      DPickett (A)LOlshan for signed on DATE        11/ 20 /06    11/ 21 /06          11 / 20 /06      10 / 30 /06      / 11/22 /06 REQUEST FOR ADDITIONAL INFORMATION SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2, TECHNICAL SPECIFICATION CHANGE REQUEST FOR ULTIMATE HEAT SINK TEMPERATURE DOCKET NOS. 50-327 AND 50-328
which is from December to March. The applicant should verify this statement based on historical water temperatures, water levels, and recorded UHS shutdowns.7.Please clarify the condition of simulation for the recession curve in Page 18 ofReference #8.
: 1. While the applicant assumed a Chickamauga earthdam breach width of 400 feet which is about 5 times dam height as suggested by the U.S. Bureau of Reclamation (1998), a recent study by Wahl (2004; "Uncertainty of Predictions of Embankment Dam Breach Parameters," ASCE J. of Hydraulic Engr. V.130, No. 5) argued that the uncertainties in breach width estimates are widely recognized to be large. For large storage dams, breach width is a function of both breach height and reservoir storage volume.
Mr. Karl W. SingerSEQUOYAH NUCLEAR PLANTTennessee Valley Authority cc: Mr. Ashok S. Bhatnagar, Senior Vice President Nuclear Operations Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801   Mr. Larry S. Bryant, Vice PresidentNuclear Engineering & Technical Services Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN  37402-2801Mr. Robert J. Beecken, Vice PresidentNuclear Support Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801   Mr. Randy DouetSite Vice President Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37384-2000General CounselTennessee Valley Authority ET 11A 400 West Summit Hill Drive Knoxville, TN  37902Mr. John C. Fornicola, ManagerNuclear Assurance and Licensing Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801Mr. Glenn W. Morris, Manager Corporate Nuclear Licensing and Industry Affairs Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801Mr. Paul L. Pace, ManagerLicensing and Industry Affairs ATTN: Mr. James D. Smith Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37384-2000Mr. David A. Kulisek, Plant ManagerSequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37384-2000Senior Resident InspectorSequoyah Nuclear Plant U.S. Nuclear Regulatory Commission 2600 Igou Ferry Road Soddy Daisy, TN 37379Mr. Lawrence E. Nanney, DirectorDivision of Radiological Health Dept. of Environment & Conservation Third Floor, L and C Annex 401 Church Street Nashville, TN 37243-1532County MayorHamilton County Courthouse Chattanooga, TN 37402-2801Ms. Ann P. Harris341 Swing Loop Road Rockwood, Tennessee 37854}}
Therefore, the applicant should consider both breach width and storage volume in estimating breach width. It is expected that the licensees estimate of breach width will consider reasonable assurance for protection of ultimate heat sink (UHS) volume and intake head.
: 2. Please clarify that there is enough margin to ensure the provision of at least 4 hours of river level above 670 feet following a loss of downstream dam considering the uncertainty in the reservoir recession (drawdown) curves (Graph on Page E1-15) caused by the uncertainty in estimating breach width.
: 3. Please revise the recession curves in Page E1-15 by taking into account the backwater effect at the Sequoyah Nuclear Plant emergency raw cooling water intake site, which is located about 14 miles upstream of Chickamauga Dam.
: 4. For the staff to perform its confirmatory analysis, please provide input, output, and source code of the simulated open channel hydraulics model used to construct the tailwater rating curve at the Chickamauga Dam site.
: 5. While the initial pool level of the Chickamauga reservoir is very sensitive to the rate of reservoir recession, the applicant should justify the use of an initial pool level of 680 feet in simulating reservoir recession curves. Or, please explain why one of driest/wettest water levels should not be used as an initial condition to be conservative.
: 6. Page 4 in reference #8 of Enclosure 1 states that the reservoir levels are lower at other times of the year, but the ultimate heat sink limit is not approached during this time, which is from December to March. The applicant should verify this statement based on historical water temperatures, water levels, and recorded UHS shutdowns.
: 7. Please clarify the condition of simulation for the recession curve in Page 18 of Reference #8.
Enclosure
 
Mr. Karl W. Singer                            SEQUOYAH NUCLEAR PLANT Tennessee Valley Authority cc:
Mr. Ashok S. Bhatnagar, Senior Vice President Mr. Glenn W. Morris, Manager Nuclear Operations                           Corporate Nuclear Licensing Tennessee Valley Authority                       and Industry Affairs 6A Lookout Place                             Tennessee Valley Authority 1101 Market Street                            4X Blue Ridge Chattanooga, TN 37402-2801                    1101 Market Street Chattanooga, TN 37402-2801 Mr. Larry S. Bryant, Vice President Nuclear Engineering & Technical Services     Mr. Paul L. Pace, Manager Tennessee Valley Authority                   Licensing and Industry Affairs 6A Lookout Place                             ATTN: Mr. James D. Smith 1101 Market Street                           Sequoyah Nuclear Plant Chattanooga, TN 37402-2801                   Tennessee Valley Authority P.O. Box 2000 Mr. Robert J. Beecken, Vice President        Soddy Daisy, TN 37384-2000 Nuclear Support Tennessee Valley Authority                   Mr. David A. Kulisek, Plant Manager 6A Lookout Place                             Sequoyah Nuclear Plant 1101 Market Street                           Tennessee Valley Authority Chattanooga, TN 37402-2801                    P.O. Box 2000 Soddy Daisy, TN 37384-2000 Mr. Randy Douet Site Vice President                          Senior Resident Inspector Sequoyah Nuclear Plant                       Sequoyah Nuclear Plant Tennessee Valley Authority                   U.S. Nuclear Regulatory Commission P.O. Box 2000                                 2600 Igou Ferry Road Soddy Daisy, TN 37384-2000                    Soddy Daisy, TN 37379 General Counsel                              Mr. Lawrence E. Nanney, Director Tennessee Valley Authority                    Division of Radiological Health ET 11A                                        Dept. of Environment & Conservation 400 West Summit Hill Drive                    Third Floor, L and C Annex Knoxville, TN 37902                          401 Church Street Nashville, TN 37243-1532 Mr. John C. Fornicola, Manager Nuclear Assurance and Licensing              County Mayor Tennessee Valley Authority                    Hamilton County Courthouse 6A Lookout Place                              Chattanooga, TN 37402-2801 1101 Market Street Chattanooga, TN 37402-2801                    Ms. Ann P. Harris 341 Swing Loop Road Rockwood, Tennessee 37854}}

Latest revision as of 22:33, 13 March 2020

RAI, Technical Specification Change Request for Ultimate Heat Sink
ML063130442
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 11/22/2006
From: Pickett D
NRC/NRR/ADRO/DORL/LPLII-2
To: Singer K
Tennessee Valley Authority
Paige, Jason, NRR/JCP4
References
TAC MD2621, TAC MD2622
Download: ML063130442 (4)
v • d • e


Text

November 22, 2006 Mr. Karl W. Singer Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801

SUBJECT:

SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING TECHNICAL SPECIFICATION CHANGE REQUEST FOR ULTIMATE HEAT SINK TEMPERATURE (TAC NOS. MD2621 AND MD2622)

Dear Mr. Singer:

By letter dated July 12, 2006, the Tennessee Valley Authority (TVA, the licensee) submitted Technical Specification Change Request, Section 3.7.9.1, Ultimate Heat Sink (UHS)

Temperature Increase and Elevation Changes, for Sequoyah Nuclear Plant, Units 1 and 2.

This revision will change the minimum UHS water elevation in Section 3.7.5.a from 670 feet to 674 feet. The essential raw cooling water temperature requirement in Section 3.7.5b will be increased from 83 degrees Fahrenheit (°F) to 87 °F.

In order for the staff to complete its review of the information provided by the licensee, we request that TVA provide responses to the enclosed request for additional information (RAI).

Based on discussions with your staff, we understand that you plan to respond to the enclosed RAI within 60 days of receipt of this letter. If you have any questions about this material, please contact me at (301) 415-1364.

Sincerely,

/RA/

Douglas V. Pickett, Senior Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-327 & 50-328

Enclosure:

Request for Additional Information cc: See next page

ML063130442 NRR-088 OFFICE LPLI2-2 LPL2-2/PM LPL2-2/LA EGCB/BC LPL2-2/BC (A)

NAME JPaige DPickett RSola RKaras as DPickett (A)LOlshan for signed on DATE 11/ 20 /06 11/ 21 /06 11 / 20 /06 10 / 30 /06 / 11/22 /06 REQUEST FOR ADDITIONAL INFORMATION SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2, TECHNICAL SPECIFICATION CHANGE REQUEST FOR ULTIMATE HEAT SINK TEMPERATURE DOCKET NOS. 50-327 AND 50-328

1. While the applicant assumed a Chickamauga earthdam breach width of 400 feet which is about 5 times dam height as suggested by the U.S. Bureau of Reclamation (1998), a recent study by Wahl (2004; "Uncertainty of Predictions of Embankment Dam Breach Parameters," ASCE J. of Hydraulic Engr. V.130, No. 5) argued that the uncertainties in breach width estimates are widely recognized to be large. For large storage dams, breach width is a function of both breach height and reservoir storage volume.

Therefore, the applicant should consider both breach width and storage volume in estimating breach width. It is expected that the licensees estimate of breach width will consider reasonable assurance for protection of ultimate heat sink (UHS) volume and intake head.

2. Please clarify that there is enough margin to ensure the provision of at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> of river level above 670 feet following a loss of downstream dam considering the uncertainty in the reservoir recession (drawdown) curves (Graph on Page E1-15) caused by the uncertainty in estimating breach width.
3. Please revise the recession curves in Page E1-15 by taking into account the backwater effect at the Sequoyah Nuclear Plant emergency raw cooling water intake site, which is located about 14 miles upstream of Chickamauga Dam.
4. For the staff to perform its confirmatory analysis, please provide input, output, and source code of the simulated open channel hydraulics model used to construct the tailwater rating curve at the Chickamauga Dam site.
5. While the initial pool level of the Chickamauga reservoir is very sensitive to the rate of reservoir recession, the applicant should justify the use of an initial pool level of 680 feet in simulating reservoir recession curves. Or, please explain why one of driest/wettest water levels should not be used as an initial condition to be conservative.
6. Page 4 in reference #8 of Enclosure 1 states that the reservoir levels are lower at other times of the year, but the ultimate heat sink limit is not approached during this time, which is from December to March. The applicant should verify this statement based on historical water temperatures, water levels, and recorded UHS shutdowns.
7. Please clarify the condition of simulation for the recession curve in Page 18 of Reference #8.

Enclosure

Mr. Karl W. Singer SEQUOYAH NUCLEAR PLANT Tennessee Valley Authority cc:

Mr. Ashok S. Bhatnagar, Senior Vice President Mr. Glenn W. Morris, Manager Nuclear Operations Corporate Nuclear Licensing Tennessee Valley Authority and Industry Affairs 6A Lookout Place Tennessee Valley Authority 1101 Market Street 4X Blue Ridge Chattanooga, TN 37402-2801 1101 Market Street Chattanooga, TN 37402-2801 Mr. Larry S. Bryant, Vice President Nuclear Engineering & Technical Services Mr. Paul L. Pace, Manager Tennessee Valley Authority Licensing and Industry Affairs 6A Lookout Place ATTN: Mr. James D. Smith 1101 Market Street Sequoyah Nuclear Plant Chattanooga, TN 37402-2801 Tennessee Valley Authority P.O. Box 2000 Mr. Robert J. Beecken, Vice President Soddy Daisy, TN 37384-2000 Nuclear Support Tennessee Valley Authority Mr. David A. Kulisek, Plant Manager 6A Lookout Place Sequoyah Nuclear Plant 1101 Market Street Tennessee Valley Authority Chattanooga, TN 37402-2801 P.O. Box 2000 Soddy Daisy, TN 37384-2000 Mr. Randy Douet Site Vice President Senior Resident Inspector Sequoyah Nuclear Plant Sequoyah Nuclear Plant Tennessee Valley Authority U.S. Nuclear Regulatory Commission P.O. Box 2000 2600 Igou Ferry Road Soddy Daisy, TN 37384-2000 Soddy Daisy, TN 37379 General Counsel Mr. Lawrence E. Nanney, Director Tennessee Valley Authority Division of Radiological Health ET 11A Dept. of Environment & Conservation 400 West Summit Hill Drive Third Floor, L and C Annex Knoxville, TN 37902 401 Church Street Nashville, TN 37243-1532 Mr. John C. Fornicola, Manager Nuclear Assurance and Licensing County Mayor Tennessee Valley Authority Hamilton County Courthouse 6A Lookout Place Chattanooga, TN 37402-2801 1101 Market Street Chattanooga, TN 37402-2801 Ms. Ann P. Harris 341 Swing Loop Road Rockwood, Tennessee 37854

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