ML19332A272
| ML19332A272 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 09/03/1980 |
| From: | Oprea G HOUSTON LIGHTING & POWER CO. |
| To: | |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, ST-HL-AE-523, NUDOCS 8009110384 | |
| Download: ML19332A272 (5) | |
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The Light company Houston Lighiing & Power RO. Box 1700 Houston, Texas 77001 (713)228-9211 September 3,1980 ST-HL-AE-523 SFN: V-0530 Mr. Karl Seyfrit Oirector, Region IV Nuclear Regulatory Comission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012
Dear fir. Seyfrit:
South Texas Project Units 1&2 Docket Nos. STN 50-498, STN E0-499 Final Report on the Diesel Generator Fuel Oil Tank Room Exhaust Fans On June 20,1930, pursuant to 10CFR50.55(e), Houston Lighting & Power Company notified your office of a potentially reportable deficiency involving the exhaust fans for the diesel generator fuel oil tank rooms. The interim report of July 16, 1980, indicated that this deficiency is reportable, and that the next recort on this concern would be submitted by September 5,1980.
In resconse to that commitment, the final report is attached.
If there are any questions, please contact Mr. fiichael E. Powell at (713) 676-8592.
Veey truly yours,
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Exe tive ice President MEP/PL'.1/pj b Attachnent gdl$
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September 3,1980 Itust:n tp'q, & ne company ST-HL-AE-523 SFN: V-0530 Page 2 cc:
D. G. Barker C. L. McNeese H. R. Dean R. L. Waldrop G. B. Painter
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A. J. Granger R. A. Frazar M. D. Schwarz Baker &Botts) l R. Gordon Gooch Baker & Botts)
J. R. Newman Lowenstein, Newman, Reis. Axelrad & Toll)
Director, Office of Inspection & Enforcement Nuclear Regulatory Commission Washington, D. C. 20555 M. L. Borchelt Executive Vice President Central Power & Light Company P. O. Box 2121 Corpui Christi, Texas 78403 R. L. Range Central Power & Light Company P. O. 2121 Corpus Christi, Texas 78403 R. L. Hancock l
Director of Electrical Utilities l
City of Austin P. O. Box 1088 t
T. H. Muehlenbeck City of Austin l
P. O. Box 1088 Austin, Texas 78767 J. B. Poston Assistant General Manager of Operations City Public Service Board P. O. Box 1771 San Antonio, Texhs 78296 A. vonRosenberg City Public Service Board P. O. Box 1771 San Antonio, Texas 78296 i
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Houston bg%ng & M Compary ST-HL-AE-523 Page 3
Charles Bechoefer. Esquire Chairman. Atomic Safety & Licensing Board U.S. Nuclear Regulatory Commission Washington, D.C. 20555
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Dr. James C. Lamb. III 313 Woodhaven Road Chapel Hill. North Carolina 27514 Dr. Enr.eth A. Luebke Atomic Safety & Licensing f.ommission U.S. Nuclear Regulatory Commission Washington. D.C.20555 Steven A. Sinkin. Esquire 116 Villita Street San An+anio. Texas 78205 Citizens for Equitable Utilities c/o Ms. Peggy Buchorn Route 1. Box 432 Brazoria. Texas 77422 Richard W. Lowerre. Esquire Assistant Attorney General for the State of Texas P. O. Box 12548 Capitol Station Austin. Texas 78711 Henry J. McGurren. Esquire Hearing Attorney l
Office of the Executive Legal Director U.S. Nuclear Regulatory Commission Washington D.C. 20555 o
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4 Final Report Diesel Generator Fuel Oil Tank Room Exhaust Fans September 3,1980 g
SUMMARY
During a routine design review, a deficiency was discovered in the design of the exhaust fans for the diesel generator fuel oil tank rooms. The Diesel Generator Building (DGB) tank room exhaust fan motors are required to be Class IE and to be supplied from a Class IE power source. The fan / motor assemblies are not.
othemise reauired to meet safety-related or seismic Category I design requirements.
This is a unique design situation for the South Texas Project (STP) and is the result of a plant-specific regulatory requirement imposed by the NRC during review of the Construction Pemit application. This deficiency was detemined to be reportable pursuant 10CFR50.55(e).
DESCRIPTION OF THE INCIDENT The interim report of July 16, 1980, identified the deficiency as being the use of a non-Class IE power source to the fan motors. Further review has resulted in a better definition of the deficiency. Design considerations dictated that the motors be provided with a Class IE power source to meet requirements of the STP Safety Evaluation Report, Supplement 1.
STP design requires these motors to be continuously energized on the Class IE power source which in turn requires qualified motors.
Initial design, however, had the motor power source classified as non-Class IE. Consequently, the motors were purchased under non-safety class l
specification, rather than Class IE. The basis for this deficiency is that these j
motors were improperly procured as non-Class IE for loading onto the Class IE power supplies, thus violating the STP design criteria for a continuously energized l
fan /notor assembly.
CORRECTIVE ACTION Following identification of this deficiency, the imediate action taken was placement of a " hold" on all engineering drawings issued to Construction related to the subject fans. With the engineering " hold" instituted, field installation f s procedurally disallowed. The fan / motor assemblies have been delivered to the site. This " hold" will be removed and, therefore, installation allowed following replacement with qualified motors, which are being procured.
RECURRENCE CONTROL Because of the unique design situation related to this deficiency, as stated earlier, no general recurrence control program is considered necessary. Appropriate char.ges will be made to the pertinent design documents, however, to provide positive id atification of power source design requirements and Class IE qualification requirements for the DGB tank room exhaust fan motors. This aspect of fan motor design will also be subjected to the design verification program.
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r Final Report -
2/2 Diesel Generator Fuel Oil Tank Room Exhaust Fans September 3, 1980
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SAFETY ANALYSIS No specific safety analysis was perfomed for this deficiency. Since adherence to plant specific regulatory criteria for design of these fan / motor assemblies was not maintained, this deficiency was detemined to be reportable pursuant to 10CFR50.55(e).
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