ML20245J063
| ML20245J063 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/10/1989 |
| From: | Michael Ray TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20245J068 | List: |
| References | |
| NUDOCS 8908170480 | |
| Download: ML20245J063 (3) | |
Text
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 U10fB TVA-SQN-TS-89-24 10 CFR 50.90 U.S. Nuclear Regulatory Comm'ssion ATTN:
Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket No. 50-327 Tennessee Valley Authority SEQUOYAH NUCLEAR PLANT (SQN) UNIT 1 - ADDITIONAL INFORMATION FOR TECHNICAL SPECIFICATION (TS) CHANGE 89-24
Reference:
TVA letter to NRC dated June 20, 1989, "Sequoyah Nuclear Plant (SQN) Unit 1 - Technical Specification (TS) Change 89-24" of this letter contains a copy of Revision 3 to TVA's SQN Unit 1 ice-weight calculation that supports NRC review of TVA's proposed TS Change 89-24 (see referenced letter).
Revision 3 addresses minor design input errors that were found during a review by TVA's Quality Assurance Group. A discrepancy was found in the computation of the number of days between ice weighing surveillance noted in Table 2 of the Revision 2 calculation.
The corrected number of days is listed on Sheet 2a of the enclosed Revision 3 calculation package.
These new values have been evt.luated for any possible impact on the results of the Revision 2 i
analysis transmitted to you in the referenced letter.
TVA selected tte three lowest ice-weight regions as predicted by the Revision 2 analysis (Bay 24, Group 2-Row 1, Group 3-Row 1) and recalculated the predicted ice weights for i
each region. The following provides the results of TVA's calculations.
Predicted Ice Weights Region Revision 2 Revision 3 Percent Increase 1.
Bay 24 1,178.2 1,182.4 0.36 2.
Group 2-Row 1 1,082.3 1,084.8 0.23 3.
Group 3-Row 1 1,026.1 1,042.1 1.6 Based on the results of TVA's calculation for each of the three worst case regions above, TVA determined that the minor input errors would have an insignificant impact on the results of the Revision 2 analysis in the above areas. Additional informal evaluations have indicated that in no instance did significant decreases occur in the predicted ice weights and that the above regions continue to be the limiting weights. Consequently, Revision 3 does not contain any new computations or analyses.
Q0N 8908170480 890810 FDR ADOCK 05000327 ig P
FDC An coual Opportunity Employer
AUG 101989
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U.S. Nuclear Regulatory Commission In addition to the Revision 3 calculation provided in Enclosure 1, TVA has included in Enclosure 2 the latest information from Westinghouse Electric Corporation regarding their preliminary containment analyses for SQN.
This information will supercede the information previously provided to you in (page 4) of the referenced letter.
Please direct questions concerning this issue to D. V. Goodin at (615) 843-7734.
Very truly yours, TENNESSEE VALLEY AUTHORITY M. J." Ray, Man (ager Licensing Project Management Sworn / )o[>pnd subsced be ore me this 1 day of
- waa - 1989 Notary Public MyCommissionExpires/b Enclosures cc
- See page 3
AUG 101989
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U.S. Nuclear Regulatory Commission cc: Ms. S. C. Black, Assistant Director (Enclosures) for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. Wilson, Assistant Director (Enclosures) for Inspection Program::
TVA Projects Division U.S. Nuclear Regulatory Commission Region II l
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. Michael H. Mobley, Director Division of Radiological Health T.E.R.R.A. Building 150 9th Avenue, N Nashville, Tennessee 37203 NRC Resident Inspector (Enclotures)
Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 American Nuclear Insurers (Enclosures)
Attention:
Librarian The Exchange, Suite 245 270 Farmington Avenue Farmington, Connecticut 06032 l
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