ML20071M659
| ML20071M659 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 09/14/1982 |
| From: | Oprea G HOUSTON LIGHTING & POWER CO. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, ST-HL-AE-885, NUDOCS 8209270198 | |
| Download: ML20071M659 (3) | |
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The Light Company n --ugumg& n-m m>x noo n-i.wxumouwwnn September 14, 1982 ST-HL-AE-885 File Number: G12.127 SFN: V-0530
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Mr. John T. Collins i
gg l g gggg Regional Administrator, Region IV jih>j ;'
i Nuclear Regulatory Commission Lo 611 Ryan Plaza Dr., Suite 1000 Arlington, Texas 76012
Dear Mr. Collins:
South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Final Report Concerning the Design of the Auxiliary Feedwater System On July 27, 1982, pursuant to 10CFR50.55(e), Houston Lighting & Power Company notified your office of a potential deficiency involving the design of the Auxiliary Feedwater System (AFWS). The concern was comprised of several items involving improper classification of components and piping, and one unique item involving overpressurization of the AFWS discharge piping.
Reports for two of those items which were found to represent a potential safety hazard were provided as attachments to our August 25, 1982 report.
Since our previous report, Bechtel has evaluated the safety hazard associated with the classification of the AFWS pump recirculation lines and a final report on this matter is attached. This completes our filing of a final report for the matter reported on July 27, 1982.
If you should have any questions concerning this iten, please contact Mr. Michael E. Powell at (713)877-3281.
Very truly yours, f\\
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Exec 0tivd, ice President SSR/mg
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Attachment
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8209270198 820914 PDR ADOCK 05000498 S
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Ilomion 1.ighting & Power Company cc:
G. W. Oprea, Jr.
J. H. Goldberg ST-HL-AE-885 J. G. Dewease File Number: G12.127 J. D. Parsons Page 2 D. G. Barker C. G. Robertson R. A. Frazar J. W. Williams R. J. Maroni J. E. Geiger H. A. Walker S. M. Dew J. T. Collins (NRC)
D. E. Sells (NRC)
W. M. Hill, Jr.
(NRC)
M. D. Schwarz (Baker &Botts)
R. Gordon Gooch (Baker &Botts)
J. R. Newman (Lowenstein, Newman, Reis, & Axelrad)
STP RMS Director, Office of Inspection & Enforcement Nuclear Regulatory Commission Washington, D. C. 20555 G. W. Muench/R. L. Range Charles Bechhoefer, Esquire Central Power & Light Company Chairman, Atomic Safety & Licensing Board P. O. Box 2121 U. S. Nuclear Regulatory Commission Corpus Christi, Texas 78403 Washington, D. C.
20555 H. L. Peterson/G. Pokorny Dr. James C. Lamb, III City of Austin 313 Woodhaven Road P. O. Box 1088 Chapel Hill, North Carolina 27514 Austin. Texas 78767 J. B. Poston/A. vonRosenberg Mr. Ernest E. Hill City Public Service Board Lawrence Livermore Laboratory P. O. Box 1771 University of California San Antonio, Texas 78296 P. O. Box 808, L-46 Livermore, California 94550 Brian E. Berwick, Esquire William S. Jordan, III Assistant Attorney General Harmon & Weiss for the State of Texas 1725 I Street, N. W.
1 P. O. Box 12548 Suite 506 Capitol Station Washington, D. C.
20006 Austin, Texas 78711 Lanny Sinkin Citizens for Equitable Utilities, Inc.
Citizens Concerned About Nuclear Power c/o Ms. Peggy Buchorn 5106 Casa Oro Route 1, Box 1684 San Antonio, Texas 78233 Brazoria, Texas 77422 Jay Gutierrez, Esquire Hearing Attorney Office of the Executive Legal Director U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Revision Date 08-23-82
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r FINAL REPORT ON THE AFWS PUMP RECIRCULATION LINES 1.
SUMMARY
Four AFWS pump recirculation lines outside the Isolation Valve Cubicle (IVC) connected to the condensate storage tank were identified as non-safety class piping. The failure of these lines in a seismic event could result in the loss of the auxiliary feedwater inventory when the AFWS pumps are in operation.
II.
DESCRIPTION OF DEFICIENCY During a review of the AFWS, it was found that the AFWS pump recirculation lines outside the IVC are non-safety class piping. The rupture of the recirculation lines in a seismic event may result in the loss of the auxiliary feedwater inventory. Adequate water storage is required to be maintained in the condensate storage tank for the AFWS to cool down the Reactor Coolant System (RCS) to Residual Heat Removal conditions following any transient.
A review of the water storage requirements has been performed by Bechtel and given the failure of the recirculation lines adequate margin of water would not exist, thus creating a safety hczard.
III.
CORRECTIVE ACTION The AFWS pump recirculation lines outside the IVC will be upgraded to Safety Class 3, Seismic Category 1 piping, or isolation capability will be provided.
The corrective action will be documented in a FSAR amendment.
IV.
SAFETY ANALYSIS The condensate storage tank is designed to retain a sufficient quantity of water for the AFWS to remove RCS heat following any transient.
The rupture of the recirculation lines when the AFWS pumps are in operation will result in the loss of portions of the water inventory of the AFWS. The minimum water inventory currently described in the FSAR is based on a combination of criteria that includes maintaining hot shutdown conditions for several hours followed by a cooldown to Residual Heat Removal System conditions. The hazard that is created by the postulated rupture of these lines and resultant water loss is the eventual loss of the steam generators as a heat sink.
Several hours into the cooldown process the operator would have to utilize an alternative cooldown procedure using the pressurizer PORV and safety injection or provide more water to the condensate storage tank. Since both of these actions involve the use of non-safety grade equipment a safety hazard could exist.