ML20247C824
| ML20247C824 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/27/1989 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8903300279 | |
| Download: ML20247C824 (4) | |
Text
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TENNESSEE VALLEY-AUTHORili CH ATTANOOGA. TENNESSEE 37401 SN 157B Lookout Place MAR 271989
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U.S. Nuclear Regulatory Commission l
ATTN: Document Control Desk 3
Washington, D.C.
20555'
]
i Gentlemen:
In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority.
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50-328 l
SEQUOYAH NUCLEAR PLANT GSQN) UNITS 1 AND 2 - NRC INSPECTION REPORT 1
NOS. 50-327/88-29 AND 50-328/88 REVISED RESPONSE TO NOTICE OF VIOLATION Enclosed is TVA's revised response to S. D. Richardson's letter to S.'A. White dated October 20, 1988, that transmitted violation 50-327, 328/88-29-01.
TVA's previous response was submitted on November 21, 1988.
This response was initiated as a result of a review of the hydrostatic test pressure package completed on unit 1.
' provides TVA's revised response.to the notice of violation.
3 Summary statements of commitments contained in this submittal are provided in enclosure 2.
If you have any questions concerning this submittal, please telephone.
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M. A. Cooper at (615) 843-6549, i
Very truly yours, TENNCSSEE VALL Y AUTHORITY R. Gridley, Ma ger Nuclear Licens ng and Regulatory Affairs Enclosures cc:
See page 2 l
f6DI 8903300279 890327
$DR ADOCK 05000327
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PDC j
An Equal Opportunity Employer
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.; -MAR 2 7.1989'-
- U.Si. Nuclear.Regulat6ry Commission-
. Enclosures cc (Enclosures):
Ms. S. C. Black, Assistant Director for Projects.
TVA~ Projects Division v
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 m
Sequoyah Resident Inspector Sequoyah Nuclear Plant-l 2600 Igou Ferry Road l
Soddy Daisy, Tennessee 37379 l
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v ENCLOSURE 1 REVISED RESPONSE TO NRC INSPECTION REPORT 3
N05. 50-327/88-29 AND 50-328/88-29 I
Violation 50-327, 328/88-29-01 "TVA in Nuclear Engineering Procedure (NEP) 3.1, Calculations, Section 2.2 defines, essential calculations as those which address plant systems whose failure could result in the loss of the ability to place the plant in the appropriate shutdown mode.
Further in Section 3.0. it is stated that each release of drawings shall be accompanied or proceeded [ sic] by approved calculations and analyses.
1 Contrary to the above, TVA did not have hydraulic and thermal design.
J calculations for the containment spray system, an essential safety system, which established the design basis for the pressure and temperature boundaries shown on TVA drawing 47W612-1 [ sic), Flow Diagram Containment Spray System
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Drawing, Revision 16, dated February 16, 1988.
j This is a severity level IV violation (Supplement I)"
RevisedCorrectiveStepsThatWillBeTakentoAvoidFurtherbolations TVA stated in its original submittal that hydrostatic testing of,the affected portions of the containment spray system has been completed by work plan (WP) 6674-01.
This statement should have been clarified by the addition of the unit indicator, i.e., unit 1.
The hydrostatic test for unit 2 was not performed at that time nor was it intended to be performed until the cycle 3 refueling outage for unit 2.
l In preparation for revision of associated flow drawings, review of the hydrostatic test performed by WP 6674-01 for unit I was found to be inadequate.
The hydrostatic test performed did not include a walk-down of all the affected welds in the hydrostatic test boundary. As discussed at the time of the Safety System Quality Evaluation, there are no operability issues involved because the portion of the containment spray pump test line that requires hydrostatic testing is isolated from the portion of the system required and aligned for accident mitigation by locked closed valves 72-503 and 72-504.
The hydrostatic test for unit 2 has been completed for the affected portions of the unit 2 containment spray system by HP 0983-01.
Design change notice (DCN) M0983A has been issued, and flow drawing 47W812-1 has been revised for unit 2.
This revision reflects the correct design parameters.
Hydrostatic testing of the affected portions of the unit 1 containment spray system will be reperformed by WP 1093-01 during the next outage of sufficient duration, but no later than the unit 1 cycle 4 refueling outage.
DCN M01093A has been issued, and flow drawing 47H812-1 for unit I will be revised and i
issued 30 days after performance of the hydrostatic test.
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ENCLOSURE 2 LIST OF COMMITMENTS 1.
TVA will hydrostatically retest the affected portions of the unit 1 containment spray system during the next outage of sufficient duration, but no later than before restart from the unit 1 cycle 4 refueling outage.
2.
Flow drawing 47H812-1 for unit I will be revised and issued 30 days after performance of the unit I hydrostatic test.
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