ML20073G165
| ML20073G165 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 04/06/1983 |
| 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-941, NUDOCS 8304180176 | |
| Download: ML20073G165 (4) | |
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The Light Company ni-o,, ug>>isg & e-m a-i700 ti-si-mxas 7mii ois mmii April 6 1983 ST-HL-AE-941 File Number: G12.126 n7 Mr. John T. Collins Regional Administrator, Region IV Nuclear Regulatory Commission f;pg 7 g 1933 611 Ryan Plaza Dr., Suite 1000 Arlington, Tr as 76012
Dear Mr. Collins:
South Texas Project Units 1 & 2
} E-17 Docket Nos. STN 50-498, STN 50-499 Final Report Concerning the Essential Cooling Water Strainer Backwash Discharge Line On July 23, 1982, pursuant to 10CFR50.55(e), Houston Lighting & Power Company (HL&P) notified your office of an item concerning the Essential Cooling Water (ECW) self-cleaning strainer backwash discharge lines.
Attached is the Final Report which identifies the corrective actions to be implemented.
If you should have any questions concerning this item, please contact Michael E. Powell at (713) 877-3281.
Very truly yours, b
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' ' Executive Vice*-President l
MEP/enb Attachment 8304180176 830406 PDR ADOCK 05000498 S
PDR l
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1 Ilouston Lighting & Power Company April 6, 1983 cc:
G. W. Oprea, Jr.
ST-HL-AE-941 J. H. Goldberg File Nunber: G12.125 J. G. Dewease Page 2 J. D. Parsons D. G. Barker M. R. Wisenburg R. A. Frazar J. W. Williams R. J. Maroni J. E. Geiger H. A. Walker S. M. Dew J. T. Collins (NRC)
H. E. Schierling (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. C. Box 1771 University of California San Antonio, Texas 78296 P. O. Box 808, L-46 j
Livermore, California 94550 Brian E. Berwick, Esquire William S. Jordan, III j
Assistant Attorney General Harmon & Weiss l
for the State of Texas 1725 I Street, N. W.
P. O. Box 12548 Suite 506 Capitol Station Washington, D. C.
20006 Austin, Texas 78711 Lanny Sinkin Citizens for Eouitable 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 12-20-82
Final Report Concerning the Essential Cooling Water Strainer Backwash Discharge Line I.
Summary Six (6) non-nuclear safety (NNS) lines were identified as important for the proper functioning of the safety-related Essential Cooling Water System (ECWS). As presently designed, these lines have the potential to drain significant amounts of water from the Essential Cooling Pond (ECP) and inhibit the ability of the ECWS to cool the safety-related components serviced by the ECWS. The resolution of this problem is outlined in Section III of this report.
II.
Description of the Deficiency Refer to Section II of the interim report which was transmitted to the NRC on August 19, 1982 as an attachment to letter ST-HL-AE-872.
III. Corrective Action In our letter of August 19, 1982, HL&P identified several alternatives for corrective actions which were under review. The final recommended corrective action is as follows:
(a) The backwash lines shall be installed as presently designed.
(b) A second (emergency) backwash line shall be installed for each train.
These lines shall be safety class 3/ seismic Category I.
(c) The emergency backwash lines shall be valved closed until needed.
(d) The emergency backwash lines shall be routed from the self-cleaning strainers through the pond side wall of the ECP intake structt.re where they will terminate.
(e) The ECP level shall be monitored using instrumentation from the existing design.
If for any reason these instruments are not functional, the ECP level shall be monitored visually.
(f)
If the ECP level cannot be maintained above the niinimum normal level, the emergency backwash lines shall be valved open and the normal backwash lines shall be valved closed. This operator action will be taken withir. 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the level falls below the minimum normal level. Leakage for a 24-hour period will not create a safety hazard.
Appropriate inspections would be undertaken to determine the cause for the below minimum normal level situation.
(g) When the pond level has been restored to normal, the backwash flow will be switched back to the normal backwash lines unless it was determined that the normal backwash lines had failed.
In that event, the emergency lines will be used while repairs are made.
The changes outlined above will insure that the subject NNS lines will be isolated and the safety class 3/ seismic Category I backwash lines will be in use whenever the ECP level is at, or lower than, the initial level
.N assumed for analysis of the ECP.
IV. Recurrence Control Refer to section IV of the interim report which was transmitted to the NRC on August 19, 1982 as an attachment to letter ST-HL-AE-872.
V.
Safety Analysis Refer to section V cf the interim report which was transmitted to the NRC on August 19, 1982 as an attachment to letter ST-HL-AE-872.
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