ML030450546
| ML030450546 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/14/2003 |
| From: | Anand R NRC/NRR/DLPM/LPD2 |
| To: | Scalice J Tennessee Valley Authority |
| Anand R, NRR/DLPM, 415-1146 | |
| References | |
| TAC MB7205, TAC MB7206 | |
| Download: ML030450546 (5) | |
Text
February 14, 2003 Mr. J. A. Scalice Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801
SUBJECT:
SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING TECHNICAL SPECIFICATION (TS) CHANGE REQUEST NO. 02-06, INCREASE CONDENSATE STORAGE TANK MINIMUM VOLUME (TAC NOS. MB7205 AND MB7206)
Dear Mr. Scalice:
In the letter dated November 15, 2002, the Tennessee Valley Authority submitted a proposed revision for Sequoyah Nuclear Plant, Units 1 and 2, TS 3.7.1.3, Condensate Storage Water.
This change would revise Limiting Condition for Operation of TS 3.7.1.3 by increasing the required minimum amount of stored water from 190,000 gallons to 240,000 gallons.
As a result of our review, the Nuclear Regulatory Commission (NRC) staff has determined that additional information is necessary to continue the review. The RAI is included in the enclosure.
The NRC staff discussed the attached RAI with your staff, in a conference call on February 10, 2003. A draft version of the RAI was transmitted to you via electronic mail on January 31, 2003, prior to the conference call. Mr. Smith agreed to respond to the attached RAI by February 28, 2003.
Please have your staff contact me at (301) 415-1055, if there are any questions regarding the attached RAI.
Sincerely,
/RA/
Raj K. Anand, Project Manager, Section 2 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-327 and 50-328
Enclosure:
Request for Additional Information cc w/enclosure: See next page
ML030450546 OFFICE PDII-2\\PM PDII-2\\LA DSSA\\SRXB\\SC PDII-2\\SC NAME R Anand B Clayton FAkstulewicz KJabbour forA Howe DATE 02/14/03 02/14/03 02/14/03 02/14/03
Enclosure REQUEST FOR ADDITIONAL INFORMATION INCREASE CONDENSATE STORAGE TANK MINIMUM VOLUME SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 1.
In a conference call on February 10, 2003, you stated that the required condensate storage tank (CST) water volume is based upon the same cooldown curve as in your original analysis. Since the plant conditions changed such as increased auxiliary feedwater (AFW) temperature, increased steam generator (SG) metal volume, and a new decay heat standard, please address the following comments/questions.
A.
Provide an analysis to show that the cooldown curve is applicable to the new plant conditions considering the requirements of Branch Technical Position RSB 5-1.
B.
Compare the calculated CST water level determined using the methods above to the steady state analysis results as described in your report. Verify that your proposed CST water volume is acceptable for the plant cooldown.
2.
In Section 2.3, Main Feedwater Line Piping (page 14), you state, Only the volume of main feedwater piping from the entry-point of the AFW line is considered in calculations leading to the CST water volume requirement. Only considering the volume from the entry-point of the AFW line would neglect any water volume upstream of this entry point.
How much water volume is upstream of this entry point that could mix with the AFW?
3.
Page E1-1 of your submittal, states that the minimum CST water volume of 190,000 gallons will be increased to 240,000 gallons. You then state that this value reflects the minimum amount of feedwater required to assist in SG recovery of Unit 1, including a 12,000 margin. Given the net positive suction head requirements for the AFW pumps, vortexing, switchover level instrument uncertainty, level of the CST suction nozzle, et cetera, how many gallons of the CST are unuseable? How do you account for the unuseable volume in your calculations?
4.
How do you consider AFW pump heat and reactor coolant pump coastdown work in your CST volume requirement calculations? If they are not considered, why is this acceptable?
Mr. J. A. Scalice SEQUOYAH NUCLEAR PLANT Tennessee Valley Authority cc:
Mr. Karl W. Singer, Senior Vice President Nuclear Operations Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. James E. Maddox, Acting Vice President Engineering & Technical Services Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Richard T. Purcell Site Vice President Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37379 General Counsel Tennessee Valley Authority ET 11A 400 West Summit Hill Drive Knoxville, TN 37902 Mr. Robert J. Adney, General Manager Nuclear Assurance Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Mark J. Burzynski, Manager Nuclear Licensing Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Pedro Salas, Manager Licensing and Industry Affairs Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37379 Mr. D. L. Koehl, Plant Manager Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37379 Senior Resident Inspector Sequoyah Nuclear Plant U.S. Nuclear Regulatory Commission 2600 Igou Ferry Road Soddy Daisy, TN 37379 Mr. Lawrence E. Nanney, Director Division of Radiological Health Dept. of Environment & Conservation Third Floor, L and C Annex 401 Church Street Nashville, TN 37243-1532 County Executive Hamilton County Courthouse Chattanooga, TN 37402-2801 Ms. Ann P. Harris 341 Swing Loop Road Rockwood, Tennessee 37854