ML030450546

Request for Additional Information Regarding TS Change Request No. 02-06

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 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?

Enclosure

Mr. J. A. Scalice SEQUOYAH NUCLEAR PLANT Tennessee Valley Authority cc:

Mr. Karl W. Singer, Senior Vice President Mr. Pedro Salas, Manager Nuclear Operations Licensing and Industry Affairs Tennessee Valley Authority Sequoyah Nuclear Plant 6A Lookout Place Tennessee Valley Authority 1101 Market Street P.O. Box 2000 Chattanooga, TN 37402-2801 Soddy Daisy, TN 37379 Mr. James E. Maddox, Acting Vice President Mr. D. L. Koehl, Plant Manager Engineering & Technical Services Sequoyah Nuclear Plant Tennessee Valley Authority Tennessee Valley Authority 6A Lookout Place P.O. Box 2000 1101 Market Street Soddy Daisy, TN 37379 Chattanooga, TN 37402-2801 Senior Resident Inspector Mr. Richard T. Purcell Sequoyah Nuclear Plant Site Vice President U.S. Nuclear Regulatory Commission Sequoyah Nuclear Plant 2600 Igou Ferry Road Tennessee Valley Authority Soddy Daisy, TN 37379 P.O. Box 2000 Soddy Daisy, TN 37379 Mr. Lawrence E. Nanney, Director Division of Radiological Health General Counsel Dept. of Environment & Conservation Tennessee Valley Authority Third Floor, L and C Annex ET 11A 401 Church Street 400 West Summit Hill Drive Nashville, TN 37243-1532 Knoxville, TN 37902 County Executive Mr. Robert J. Adney, General Manager Hamilton County Courthouse Nuclear Assurance Chattanooga, TN 37402-2801 Tennessee Valley Authority 6A Lookout Place Ms. Ann P. Harris 1101 Market Street 341 Swing Loop Road Chattanooga, TN 37402-2801 Rockwood, Tennessee 37854 Mr. Mark J. Burzynski, Manager Nuclear Licensing Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801