ML20237D629
| ML20237D629 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 08/24/1998 |
| From: | Alexion T NRC (Affiliation Not Assigned) |
| To: | Cottle W HOUSTON LIGHTING & POWER CO. |
| References | |
| TAC-MA0350, TAC-MA0351, TAC-MA350, TAC-MA351, NUDOCS 9808270088 | |
| Download: ML20237D629 (4) | |
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.f Mr. Willi m T. Cottle August 24, 1998 i
' President and Chief Executive Officer j
STP Nuclear Operating Company South Texas Project Electric Generating Station P. O. Box 289 Wadsworth,TX 77483
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION ON ALTERNATE OPERATION WITH REDUCED MEASURED REACTOR COOLANT SYSTEM FLOW, SOUTH TEXAS PROJECT, UNITS 1 AND 2 (STP)(TAC NOS. MA0350 AND MA0351)
Dear Mr. Cottle:
The Nuclear Regulatory Commission staff is reviewing STP Nuclear Operating Company's (STPNOC's) December 31,1997, application for a license amendment to revise Technical
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Specification 2.1 (Safety Limits),2.2 (Limiting Safety System Settings), and 3/4.2.5 (Departure J
from Nucleate Boiling Parameters) by including alternate operating criteria to allow continued plant operation with a reduced measured reactor coolant system flow rate, if necessary.
I Based on its review, the staff has determined that additional information is needed, as discussed in the enclosure.
Sincerely, ORIGINAL SIGNED BY:
Thomas W. Alexion, Project Manager Project Directorate IV-1.
Division of Reactor Projects Ill/IV Office of Nuclear Reactor Regulation Docket Nos. 50-498 and 50-499
Enclosure:
Request for AdditionalInformation cc w/ encl: See next page DISTRIBUTION:
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August 24, 1998 Mr. William T. Cottle President and Chief Executive Officer STP Nuclear Operating Company South Texas Project Electric Generating Station P. O. Box 289 Wadsworth,TX 77483
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION ON ALTERNATE OPERATION WITH REDUCED MEASURED REACTOR COOLANT SYSTEM FLOW, SOUTH TEXAS PROJECT, UNITS 1 AND 2 (STP)(TAC NOS. MA0350 AND MA0351)
Dear Mr. Cottle:
The Nuclear Regulatory Commission staff is reviewing STP Nuclear Operating Company's (STPNOC's) December 31,1997, application for a license amendment to revise Technical Specification 2.1 (Safety Limits),2.2 (Limiting Safety System Settings), and 3/4.2.5 (Departure from Nucleate Boiling Parameters) by including attemate operating criteria to allow continued plant operation with a reduced measured reactor coolant system flow rate, if necessary.
Based on its review, the staff has determined that additional information is needed, as discussed in the enclosure.
Sincerely, M
't/ e h
l l
Thomas W. Alexion, Project Manager Project Directorate IV-1 Division of Reactor Projects Ill/lV j
Office of Nuclear Reactor Regulation l'
Docket Nos. 50-498 and 50-499
Enclosure:
Request for Additional Information cc w/ encl: See next page L
-l c
i Mr. William T. Cottle STP Nuclear Operating Company South Texas, Units 1 & 2 cc:
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Mr. David P. Loveless Jack R. Newman, Esq.
Senior Resident inspector Morgan, Lewis & Bockius U.S. Nuclear Regulatory Commission 1800 M Street, N.W.
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l P. O. Box 910 -
Washington, DC 20036-5869 L
_ Bay City, TX 77414 Mr. Lawrence E. Martin A. Ramirez/C. M. Canady Vice President, Nuc. Assurance & Licensing City of Austin STP Nuclear Operating Company l
Electric Utility Department F. O. Box 289 721 Barton Springs Road Wadsworth,TX 77483 l
Austin,TX 78704 Office of the Govemor Mr. M. T. Hardt ATTN: John Howard, Director Mr. W. C. Gunst Environmental and Natural City Public Service Board Resources Policy P. O. Box 1771 P. O. Box 12428 l
San Antonio,TX 78296 Austin,TX 78711
- Mr. G. E. Vaughn/C. A. Johnson Jon C. Wood -
Central Power and Light Company Matthews & Branscomb P. O. Box 289 One Alamo Center Mail Code: N5012 106 S. St. Mary's Street, Suite 700 Wadsworth, TX 74483 San Antonio, TX 78205-3692 INPO Arthur C. Tate, Director Records Center Division of Compliance & Inspection 700 Galleria Parkway Bureau of Radiation Control Atlanta, GA 30339-3064 Texas Department of Health 1100 West 49th Street Regional Administrator, Region IV Austin,TX 78756 U.S. Nuclear Regulatory Commission
.- 611 Ryan Plaza Drive, Suite 400 Jim Calloway Arlington,TX 76011 Public Utility Commission of Texas Electric industry Analysis D. G. Tees /R. L. Balcom P. O. Box 13326 Houston Lighting & Power Co.
Austin, TX 78711-3326 P.~ 0, Box 1700
' Houston, TX 77251 Judges, Matagorda County Matagorda County Courthouse 1700 Seventh Street l-Bay City, TX 77414 t
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REQUEST FOR ADDITIONAL INFORMATION 1.
Regarding the containment response analys!s of record (i.e., without the proposed reduced reactor coolant system (RCS) flow), provide the highest calculated containment pressure and temperature resulting from the limiting postulated accidents.
2.
In view of the fact that a recalculation of the highest containment pressure and temperature resulting from the limiting postulated accidents for the proposed reduced RCS flow has not been peiformed, show that the critical blowdown parameters (pressure and temperature) are less for reduced RCS flow versue 100% RCS flow, and therefore that the blowdown mass and energy release will be alightly less for reduced RCS flow versus 100% RCS flow.
3.
Explain the difference between the 598'F T-avg value in the Technical Specifications and the 593*F T-avg value in Table 1 of the June 30,1998, supp!ement.
1 ENCLOSURE
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