ML052210396
| ML052210396 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 08/11/2005 |
| From: | Pickett D NRC/NRR/DLPM/LPD2 |
| To: | Singer K Tennessee Valley Authority |
| Pickett D, NRR/DLPM, 415-1364 | |
| References | |
| TAC MC6569 | |
| Download: ML052210396 (4) | |
Text
August 11, 2005 Mr. Karl W. Singer Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801
SUBJECT:
WATTS BAR NUCLEAR PLANT, UNIT 1 REQUEST FOR ADDITIONAL INFORMATION REGARDING THE TEMPORARY USE OF PENETRATIONS IN THE SHIELD BUILDING DOME DURING MODES 1-4 (TAC NO. MC6569)
Dear Mr. Singer:
By letter dated April 4, 2005, Tennessee Valley Authority submitted an application for a temporary license amendment to the Watts Bar Nuclear Plant (WBN), Unit 1, technical specifications (TSs) that would allow them to use one of two penetrations in the Shield Building dome during normal power operation (Modes 1-4).
During the Cycle 6 refueling outage, two penetrations through the Shield Building dome were created in preparation for steam generator replacement activities during the Cycle 7 refueling outage. These penetrations were each closed with a steel hatch assembly prior to entering Mode 4 at the end of the outage. The proposed TS change will allow WBN Unit 1 to open one of the penetrations in the Shield Building dome up to 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> a day, 6 days a week while in Modes 1-4 during Cycle 7 operation. This action will continue until the start of the Cycle 7 refueling outage in the fall of 2006.
In order for the staff to complete its review of the subject license amendment submittal, we request that the licensee provide responses to the enclosed request for additional information.
Sincerely,
/RA/
Douglas V. Pickett, Senior Project Manager, Section 2 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-390
Enclosure:
Request for Additional Information cc w/enclosure: See next page
ML052210396 NRR-088 OFFICE LPD2-2 PM:LPD2-2 LA:LPD2-2 SC:EMCB SC:LPD2-2 NAME MVaaler DPickett BClayton ADrozd(A)
MMarshall DATE 08 / 10 / 05 08 / 10 / 05 08 / 10 / 05 by memo dated 07 / 27 /05 08 / 11 / 05
Mr. Karl W. Singer Tennessee Valley Authority WATTS BAR NUCLEAR PLANT 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, General Manager Nuclear Engineering Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Robert J. Beecken, Vice President Nuclear Support Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Michael D. Skaggs Site Vice President Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381 General Counsel Tennessee Valley Authority ET 11A 400 West Summit Hill Drive Knoxville, TN 37902 Mr. John C. Fornicola, Manager Nuclear Assurance and Licensing Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Glenn W. Morris, Manager Corporate Nuclear Licensing and Industry Affairs Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Paul L. Pace, Manager Licensing and Industry Affairs Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381 Mr. Jay Laughlin, Plant Manager Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381 Senior Resident Inspector Watts Bar Nuclear Plant U.S. Nuclear Regulatory Commission 1260 Nuclear Plant Road Spring City, TN 37381 County Executive 375 Church Street Suite 215 Dayton, TN 37321 County Mayor P. O. Box 156 Decatur, TN 37322 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 Ms. Ann P. Harris 341 Swing Loop Road Rockwood, Tennessee 37854
Enclosure REQUEST FOR ADDITIONAL INFORMATION WATTS BAR NUCLEAR PLANT, UNIT 1 TEMPORARY USE OF PENETRATIONS IN SHIELD BUILDING DOME DURING MODES 1-4 1.
The Loss-of-Coolant Accident (LOCA) dose analysis that was performed to support the license amendment request credits filtration of the release by the Emergency Gas Treatment System (EGTS) after 15 minutes. The submittal states that the assumption is that the open shield building penetration can be closed by the prestaged dedicated individual within 12 minutes, which leaves 3 minutes for the EGTS to depressurize the annulus and enable filtration of the release. How long does it take for the EGTS to adequately depressurize the annulus after the penetration is closed? By what means do you ensure that this goal is met?
2.
Considering that manual operation is used to close the shield building, have any analyses been performed to determine the impact that delaying the closure would have on the offsite and control room doses during a LOCA? Have sensitivity analyses been performed to determine how long closure may be delayed before Title 10 of the Code of Federal Regulations, Part 100 or General Design Criterion-19 dose criteria are exceeded?
3.
With exception to the EGTS filtration and release timing assumptions, are all other inputs, assumptions and methods used in the LOCA dose analysis the same as those discussed in the Watts Bar Updated Final Safety Analysis Report (UFSAR), Revision 4, and summarized in UFSAR Table 15.5-6?