ML042580242

RAI, Regarding Alternative Source Term

ML042580242
Person / Time
Site:	Browns Ferry
Issue date:	09/14/2004
From:	Ellen Brown NRC/NRR/DLPM/LPD2
To:	Singer K Tennessee Valley Authority
Brown E, NRR/DLPM 415-2315
References
TAC MB5733, TAC MB5734, TAC MB5735
Download: ML042580242 (5)

Text

September 14, 2004 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:

BROWNS FERRY NUCLEAR PLANT, UNITS 1, 2, AND 3 REQUEST FOR ADDITIONAL INFORMATION REGARDING ALTERNATIVE SOURCE TERM (TAC NOS. MB5733, MB5734, AND MB5735)

Dear Mr. Singer:

By letter dated July 31, 2002, as supplemented in letters dated December 9, 2002, February 12, March 26, July 11 and 17, 2003, May 17, July 2, and August 24, 2004, Tennessee Valley Authority (TVA) submitted a request to revise the licensing and design basis to reflect the application of the alternative source term (AST) methodology for the Browns Ferry Units 1, 2, and 3. The submittal also requested changes to various technical specifications to reflect the adoption of AST.

Based on our review of your submittal, the Nuclear Regulatory Commission staff finds that a response to the enclosed request for additional information is needed before we can complete the review. This request was discussed with your staff on August 31, and September 1, 2004, and it was agreed that a response would be provided within 30 days of the issuance of this letter.

If you have any questions, please contact me at (301) 415-2315 or Kahtan Jabbour at (301) 415-1496.

Sincerely,

/RA/

Eva A. Brown, Project Manager, Section 2 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-259, 50-260, and 50-296

Enclosure:

As stated cc w/encl: See next page

ML042580242 NRR-088 OFFICE PDII-2/PM PDII-2/PM PDII-2/LA EEIB/SC EMEB/SC PDII-2/SC(A)

NAME EBrown KJabbour BClayton RJenkins KManoly MMarshall DATE 9/14/04 9/10/04 9/10/04 9/13/04 9/13/04 9/14/04 REQUEST FOR ADDITIONAL INFORMATION ALTERNATIVE SOURCE TERM (AST) IMPLEMENTATION TENNESSEE VALLEY AUTHORITY(TVA)

BROWNS FERRY PLANT (BFN), UNITS 1, 2, AND 3 DOCKET NOS. 50-259, 50-260, AND 50-296

1. In a letter dated July 2, 2004, TVA submitted Facility Risk Consultants (FRC) report entitled, MSIV [Main Steam Isolation Value] Seismic Ruggedness Verification At Browns Ferry Nuclear Plant, May 2004. Page 5-2 of the FRC report states that [s]upport components that may exhibit non-ductile behavior are accepted based (on) the following stress allowables: Clarify whether support components are component supports or components for piping supports or something else. Provide justification for the provision that the allowable stress is greater than material yield stress for the non-ductile behavior support components.

2. Page 5-3 of the FRC report states that [w]hen test data are available, acceptable loads on test data consider mean less one standard deviation capacity. Provide technical justification for the above provision.

3. Page 5-3 of the FRC report states that [p]ipe supports not meeting the above criteria may be accepted if adjacent supports and the resulting pipe span can resist dead loads with a factor of safety of 2.0. Provide technical justification for the above provision.

4. TVA submitted a supplement for the amendment to Unit 1 AST dated August 24, 2004.

Page 19 states that [t]he NEDC-31858P-A survey of this type of industrial structure has, in general, confirmed that excellent past seismic performance exists. There are no known cases of structural collapse of either turbine buildings at power stations or structures of a similar construction. Based on the above design bases for the BFN Turbine Building, and the excellent seismic performance of similar types of industrial structures in past strong-motion earthquakes as documented in NEDC-31858P-A, it was determined that the BFN Turbine Building will remain structurally intact following a DBE

[design basis earthquake]. Provide locations in the NEDC-31858P-A that support the statement that structures exhibit excellent past seismic performance. As the Nuclear Regulatory Commission staff has not endorsed using seismic experience data for qualifying structures subjected to earthquakes, provide additional technical justification that supports the contention that the BFN Turbine Building will remain structurally intact following a DBE.

5. Are the PVC cables identified in TVAs letter dated May 17, 2004, performing any safety related function? If so, provide the environmental qualification, including the test report, which qualifies those cables for Harsh Environment service.

ENCLOSURE

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

Mr. Ashok S. Bhatnagar, Sr. VP Mr. Robert G. Jones Nuclear Operations Browns Ferry Unit 1 Plant Restart Manager Tennessee Valley Authority Browns Ferry Nuclear Plant 6A Lookout Place Tennessee Valley Authority 1101 Market Street P.O. Box 2000 Chattanooga, TN 37402-2801 Decatur, AL 35609 Mr. James E. Maddox, Vice President Mr. Mark J. Burzynski, Manager Engineering & Technical Services Nuclear Licensing Tennessee Valley Authority Tennessee Valley Authority 6A Lookout Place 4X Blue Ridge 1101 Market Street 1101 Market Street Chattanooga, TN 37402-2801 Chattanooga, TN 37402-2801 Mr. Michael D. Skaggs Mr. Timothy E. Abney, Manager Site Vice President Licensing and Industry Affairs Browns Ferry Nuclear Plant Browns Ferry Nuclear Plant Tennessee Valley Authority Tennessee Valley Authority P.O. Box 2000 P.O. Box 2000 Decatur, AL 35609 Decatur, AL 35609 General Counsel Senior Resident Inspector Tennessee Valley Authority U.S. Nuclear Regulatory Commission ET 11A Browns Ferry Nuclear Plant 400 West Summit Hill Drive 10833 Shaw Road Knoxville, TN 37902 Athens, AL 35611-6970 Mr. John C. Fornicola, Manager State Health Officer Nuclear Assurance and Licensing Alabama Dept. of Public Health Tennessee Valley Authority RSA Tower - Administration 6A Lookout Place Suite 1552 1101 Market Street P.O. Box 303017 Chattanooga, TN 37402-2801 Montgomery, AL 36130-3017 Mr. Kurt L. Krueger, Plant Manager Chairman Browns Ferry Nuclear Plant Limestone County Commission Tennessee Valley Authority 310 West Washington Street P.O. Box 2000 Athens, AL 35611 Decatur, AL 35609 Mr. Jon R. Rupert, Vice President Browns Ferry Unit 1 Restart Browns Ferry Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Decatur, AL 35609