ML20027B285
| ML20027B285 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 09/03/1982 |
| From: | Opera G, Oprea G, Oprea G HOUSTON LIGHTING & POWER CO. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 10CFR50.55E, ST-HL-AE-882, NUDOCS 8209160611 | |
| Download: ML20027B285 (3) | |
Text
r The Light NE Mf flouston Lighting & l'ower PO. liox 1700 llouston, Texas 77001 (713)228-9211 September 3, 1982 ST-HL-AE-882 File Number: G12.129 SFN: V-0530
[h@[fN!$/I Mr. John T. Collins Regional Administrator, Region IV
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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 First Interin Report Concerning Undetectable Failure in the SSPS On August 4, 1982, pursuant to 10CFR50.55(e) Houston Lighting & Power Company (HL&P) notified your office of a potentially reportable deficiency discovered by Westinghouse concerning an undetectable failure which could exist in on-line testing circuits for relays in the Solid State Protection Systen (SSPS). Westinghouse subnitted a letter to NRC-0IE Headquarters (E. P. Rahe to R. DeYoung NS-EPR-2638) dated August 6, 1982 describing this problen.
Periodic testing of the SSPS includes actuation of master relays which actuate safeguards systens.
When a preselected naster relay is energized, a proving lanp in series with the output (slave) relay coil confirms electrical continuity through the output relay coil.
Operation of the output relay is prevented by reducing the output relay coil circuit voltage from 120VAC to 15VDC during test. The naster relay is operated by means of the pushbutton test switch which also renoves the shunt from the SSPS proving lanp and allows the 15VDC to energize the lanp to confirm the continuity of the output relay coil. Upon completion of the master relay and output relay coil continuity tests, 120VAC circuit voltage is restored.
However, if the switch contacts which shunt the proving lamp should fail to reclose as expected, 120VAC would be applied to the lanp when the systen was called upon to operate.
Depending on the output relay coil impedance and the number of output relays being operated by the master relay contacts, the current through the lanp could cause it to burn open before the output relay (s) energized.
In such an instance associated safeguards devices in the affected train would not actuate.
Westinghouse and Bechtel are evaluating potential corrective actions to resolve the problen.
HL&P expects to provide further information by January 31, 1983.
1 S/
8209160611 820903 d
PDR ADOCK 05000498 P
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September 3, 1982 Ilouston 1.ighting & Power Comi>any ST-HL-AE-882 File Number: G12.129 Page 2 l
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If you should have any questions concerning this matter, please contact Mr. Michael E. Powell at (713)877-3281.
Very truly yours,
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Executive Vice President McB/mg i
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o Iloinston 1.igliting & Power Company cc:
G. W. Oprea, Jr.
September 3, 1982 J. H. Goldberg ST-HL-AE-882 J. G. Dewease File Number: G12.129 J. D. Parsons Page 3 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 (flRC)
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.
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