ML20245L796
| ML20245L796 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/27/1989 |
| From: | Fox C TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8905080137 | |
| Download: ML20245L796 (2) | |
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 SN 1578 Lookout Place APR 271989 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 SEQUOYAH NUCLEAR PLANT (SQN) - NRC INSPECTION REPORT NOS. 50-327/87-73 AND l
50-328/87-73 By letter dated April 20, 1988, TVA responded to the subject NRC inspection report concerning compensatory measures (cms).
In this response, TVA committed to procure qualified flex hoses for installation between the essential raw cooling water (ERCW) system and the emergency diesel generator coolers by the end of the unit 1-cycle 4 refueling outage.
During the initial 1
appraisal of the deficiency, it was pre ~tmed that the analysis being prepared to justify interim operation would not 1. solve / identify a long-term seismic qualification concern with the existing Flexonics hoses. A subsequent revision dated January 11, 1989, to the interim analysis showed that the l
calculated Flexonics hose fatigue life (for combined thermal, misalignment, and seismic displacement) was greater than the required fatigue life.
- Thus, this calculation demonstrates that the existing Flexonics hoses are seismically qualified for the life of the plant. Based on the revised analysis, TVA is deleting the commitment to replace the flex hoses installed between the ERCH system and the diesel generator coolers.
This CH is cancelled'(1.e., closed).
In the same letter, TVA addressed the cms to ensure manual operation of the ERCW screens'and strainers during a postulated event. Condition adverse to quality repW t SQN871263 addressed this CM and also included items identified as deficiencies in the ERCH system not related specifically to this CM. One of the items involved diesel generator building ERCH flow indicators, which read high scale and occasionally will move above 100 percent indication but do i
not peg under normal operation, i
TVA noted corrective action associated with these flow indicators as outstanding action associated with the subject CH, that is, that design documents would be prepared to process or modify the flow indicators by January 31, 1989.
After closer review of the flow indicators' function, it has been determined that the existing flow indicators are acceptable and will not require replacement or modification.
The indicators are not used under normal or emergency conditions to provide quantitative indication; and, for periodic surveillance, the indicators are used only to verify that flow is greater than 50 percent.
Periodic and special calibration ensures that adequacy of this indication is maintained.
These indicators do not affect the i
referenced CM in any way.
Therefore, TVA is deleting the commitment to procure or modify the ERCH flow indicators in the diesel generator building.
I 8905080137 890427 I \\
ADOCK0500g7 DR An Equal opportunity Ernployer
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U.S. Nuclear Regulatory Commission
/\\PR 271989 If you have any questions, please telephone M. A. Cooper at (615) 843-6549.
Very truly yours, TE ESSEE V Y UTHORITY
/
. Fo',
r.
Vice President and Nuclear Technical Director L
cc:
Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852' Ms. L. J. Watson, Acting Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379