ML20154B194
| ML20154B194 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/05/1988 |
| From: | Hermann R NRC OFFICE OF SPECIAL PROJECTS |
| To: | White S TENNESSEE VALLEY AUTHORITY |
| Shared Package | |
| ML20154B197 | List: |
| References | |
| TAC-59983, TAC-59984, NUDOCS 8805170102 | |
| Download: ML20154B194 (3) | |
Text
_ __
[ga,e UNITED STATES e'
NUCLEAR REGULATORY COMMISSION t
WASHINGTON, D C. 20555 s
,9 Docket Nos:
50-327/328 May 5, 1988 l
Mr. S. A. White Manager of Nuclear Power Tennessee Valley Authority 6N 38A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801
Dear Mr. White:
SUBJECT:
SAFETY EVALUATIONS ON FRACTURE TOUGHNESS REQUIREMENTS FOR PROTECTION AGAINST PRESSURIZED THERMAL. SHOCK EVENTS, 10 CFR 50.61 (TAC 59983/
59984, MPA A-21)
Re:
Sequoyah Nuclear Plant Units 1 and 2 By letter dated January 21, 1986, the Tennessee Valley Authority (TVA) submitted information on the material properties of and the fast neutron fluence on the reactor pressure vessel for Sequoyah Units 1 and 2 in compliance with the requirements of 10 CFR 50.61(b)(1). The staff has reviewed the infonnation and found it acceptable.
Based on its review of the fast neutron fluence on the inside surface and the material properties of the pressure vessel, the staff finds that the Sequoyah Units 1 and 2 pressure vessels meet the toughness requirements of 10 CFR 50.61 for 32 effective full power years of operation. This is a 40-year design life based on an 80 percent capacity factor. The reference temperature calculated by the applicable equation in 10 CFR 50.61(b)(2) is below the applicable screening criterien in the rule for both units. The staff Safety Evaluations are contained in Enclosures 1 and 2 for Units 1 and 2, respectively.
In accordance with 10 CFR 50.61(b)(1), we request that you submit an update to the information in the TvA letter dated January 21, 1986 whenever changes in core loadings, surveillance measurements, or other information indicate a signiffcant change in projected reference temperature values.
Such submittals could be made at the same time as the Pressure-Temperature operating limits which are required by 10 CFR Part 50 Appendix G.
0805170102 800505 PDR ADOCK 05000327 P
U Mr. S. A. White Tennessee Valley Authority Sequoyah Nuclear Plant cc:
General Counsel Regional Administrator, Region !!
Tennessee Valley Authority U.S. Nuclear Regulatory Connission 400 West Summit Hill Drive 101 Marietta Street, N.W.
E11 B33 Atlanta, Georgia 30323 Knoxville, Tennessee 37902 Resident Inspector /Sequoyah NP Mr. R. L. Gridley c/o U.S. Nuclear Regulatory Commission Tennessee Valley Authority 2600 Igou Ferry Road SN 157B Lookout Place Soddy Daisy, Tennessee 37379 Chattanooga, Tennessee 37402-2801 Mr. Richard King Mr. H. L. Abercrombie c/o U.S. GAO Tennessee Valley Authority 1111 North Shore Drive Seouoyah Nuclear Plant Suite 225. Box 194 P.O. Box 2000 Knoxville, Tennessee 37919 Soddy Daisy, Tennessee 37379 Tennessee Departnent of Health Mr. M. R. Harding and Environment Tennessee Valley Authority ATTN: Director, Bureau of Environment Sequoyah Nuclear Plant T.E.R.R.A. Building, 1st Floor P.O. Box 2000 150 9th Avenue North Soddy Daisy, Tennessee 37379 Nashville, Tennessee 37219-5404 Mr. D. L. Williams Fr. Michael H. Mobley, Director Tennessee Valley Authority Division of Radiological Health 400 Vest Summit Hill Drive T.E.R.R. A. Building, 6th Floor W10 685 150 9th Avenue North Knoxville, Tennessee 37902 Nashville, Tennessee 37219-5404 County Judge Dr. Henry Myers, Science Advisor Hamiltor: County Courthouse Committee on Interior Chattanooga, Tennessee 37402 and Insular Affairs U.S. House of Representatives Washington, D.C.
20515 1
I i
i i
f 0 - 3 t '?
~
4 2
The reporting and/or record keeping requirernents contained in this letter affect fewer than ten respondents, therefore, OMB clearance is not required under P.L.98-511.
Sincerely, Original Signed by Robert A. Hermann, Acting Assistant Director i
for Projects TVA Projects Division t
Office of Special Projects
Enclosures:
1.
Safety Evaluation for Unit 1 2.
Safety Evaluation for Unit 2 i
cc w/ enclosures:
See next page Distribution
'~lWetet file, i
NRC PDR l
Local PDR Projects Reading l
S. Ebneter J. Axelrad S. Richardson R. A. Hermann B. D. Liaw K. Barr Licensing Assistant JDonohew T. Rotella c
OGC J. Rutberg F. Miraglia E. Jordan J. Partlow tCRS(10) i TVA-Rockville
[
SON Rdg. File cc: Plant Service list l
t
/
OSP:TVA/F'{' },h,TVl li aw {P k
TVArAS/P VA 05 M
TRotella t.
RAHerrann (J
ffin J
' 88 4
88 4/33188 g/q /88 k$/88
/
4 5
h t