ML022100449

Request for Additional Information Tritium Production Program

ML022100449
Person / Time
Site:	Watts Bar
Issue date:	07/29/2002
From:	Padovan L NRC/NRR/DLPM/LPD2
To:	Scalice J Tennessee Valley Authority
Padovan L, NRR/DLPM, 415-1423
References
TAC MB1884
Download: ML022100449 (4)

Text

July 29, 2002 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:

WATTS BAR NUCLEAR PLANT, UNIT 1 REQUEST FOR RISK-INFORMED INFORMATION RE: TRITIUM PRODUCTION PROGRAM (TAC NO. MB1884)

Dear Mr. Scalice:

The Nuclear Regulatory Commission staff has reviewed your application of August 20, 2001. We need additional information to complete our review and have prepared the attached request for additional information (RAI). I discussed the enclosed RAI with Mr. Chardos, Tennessee Valley Authoritys Tritium Program Manger, and he agreed to respond to this request by August 7, 2002. Please contact me if you have any questions.

Sincerely,

/RA/

L. Mark Padovan, 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

July 29, 2002 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:

WATTS BAR NUCLEAR PLANT, UNIT 1 REQUEST FOR RISK-INFORMED INFORMATION RE: TRITIUM PRODUCTION PROGRAM (TAC NO. MB1884)

Dear Mr. Scalice:

The Nuclear Regulatory Commission staff has reviewed your application of August 20, 2001. We need additional information to complete our review and have prepared the attached request for additional information (RAI). I discussed the enclosed RAI with Mr. Chardos, Tennessee Valley Authoritys Tritium Program Manger, and he agreed to respond to this request by August 7, 2002. Please contact me if you have any questions.

Sincerely,

/RA/

L. Mark Padovan, 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 DISTRIBUTION:

PUBLIC PDII-2 R/F BClayton (Hard Copy)

MPadovan MFranovich OGC PFredrickson KJabbour ACRS ADAMS ACCESSION NO: ML022100449 OFFICE PDII-2/PM PDII-2/LA PDII-2/ASC NAME MPadovan BClayton KJabbour DATE 7/26/02 7/25/02 7/26/02 OFFICIAL RECORD COPY

Enclosure Request for Additional Information Tritium Production Program Risk-informed Information Watts Bar Nuclear Plant, Unit 1 Docket No. 50-390

1. Please provide the Sequoyah Nuclear Plant (SQN) and Watts Bar Nuclear Plant (WBN) maintenance rule program A(2) performance criteria for the following:

emergency diesel generators (EDGs) turbine driven auxiliary feedwater pumps emergency 125 Vdc supply emergency 120 Vac supply

hydrogen igniters

containment air return fans

emergency raw cooling water (ERCW) system

ice condenser

2. Are any of the above systems currently in maintenance rule program A(1) status, and if so why?

3. How many EDG failures (failure-to-start and failure-to-run) have occurred in the previous 100 starts for each of the EDGs?

4. Are any of the above EDG failures a common-mode failure of the SQN or WBN EDGs (i.e., were the other EDGs actually unavailable because the root cause of the failed EDG also actually affected the other EDGs)?

5. Do all reactor coolant pumps (RCPs) at SQN and WBN have the newer style high-temperature O-ring seals? If not, how many do not and on which unit? For those RCPs that do not have the new O-ring design, what is the schedule to replace them?

6. Do SQN and WBN conduct Severe Accident Management Guidelines drills and if so how often?

7. How many failures of the ice condenser lower inlet doors have occurred during the previous two operating cycles (i.e., did not meet technical specifications surveillance requirements)?

Are any of these failures attributed to floor upheaval/buckling causing door binding? Does Tennessee Valley Authority continue to monitor ice condenser floor growth from cycle-to-cycle?

8. Please provide the following information for both WBN and SQN based on the current probabilistic risk assessment model for each plant:

total core damage frequency (CDF) from internal events

total CDF from external events (if modeled)

percentage of CDF due to station blackout

loss of offsite power frequency and basis

probabilities of non-recovery of offsite ac power for various times in the model and basis for numbers used

probability of EDG/emergency ac bus recovery (if modeled) and the basis for the number(s)

9. What are the normal and emergency power supplies for the ERCW (intake structure) sump pumps?

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

Mr. Karl W. Singer, Senior Vice President Nuclear Operations Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Jack A. Bailey, Vice President Engineering & Technical Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. William R. Lagergren 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. 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. Paul L. Pace, Manager Licensing and Industry Affairs Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381 Mr. Larry S. Bryant, 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 Rhea County Executive 375 Church Street Suite 215 Dayton, TN 37321 County Executive Meigs County Courthouse 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 Dr. Gary Drinkard 340 Drinkard Dr.

Spring City, TN 37381 Ms. Vickie G. Davis TDEC-DOE Oversight Division 761 Emory Valley Road Oak Ridge, TN 37830-7072