ML20205P368
| ML20205P368 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 04/15/1999 |
| From: | Alexion T NRC (Affiliation Not Assigned) |
| To: | Cottle W HOUSTON LIGHTING & POWER CO. |
| References | |
| TAC-MA2500, TAC-MA2501, NUDOCS 9904200154 | |
| Download: ML20205P368 (4) | |
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1 Mr. William T. Cottle April 15, 1999 President and Chief Executive Officer STP Nuclear Operating Company South Texas Pruject Electric Generating Station P. O. Box 289 Fladsworth, TX 77483
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - PROPOSED AMENDMENTS ON REPLACEMENT STEAM GENERATOR WATER LEVEL TRIP SETPOINT DIFFERENCES, SOUTH TEXAS PROJECT, UNITS 1 AND 2 (TAC NOS. MA2500 AND MA2501)
Dear Mr. Cottle:
The Nucicar Pegulatory Commission staff is reviewing STP Nuclear Operating Company's July 22,1998, amendment application associated with the Replacement Steam Generator Project.
On the basis of its review, the staff has determined that additional information is needed as discussed in the enclosed request for additional information (RAI). This request was discussed with Mr. Mark VanNoy of your staff on March 30,1999, and a mutually agreeable response of within 45 days from the date of this letter was established. The staff appreciates the efforts expended with respect to this matter.
Sincerely, ORIGINAL SIGNED BY:
Thomas W. Alexion, Project Manager, Section 1 Project Directorate IV & Decommissioning Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-498 and 50-499 I
Enclosure:
As stated cc w/ encl: See next page
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NUCLEAR REGULATORY COMMISSION 2
WASHINGTON, D.C. 2006H001
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April 15, 1999 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 - PROPOSED AMENDMENTS ON REPLACEMENT STEAM GENERATOR WATER LEVEL TRIP SETPOINT DIFFERENCES, SOUTH TEXAS PROJECT, UNITS 1 AND 2 (TAC NOS. MA2500 AND MA2501)
Dear Mr. Cottle:
The Nuclear Regulatory Commission staff is reviewing STP Nuclear Operating Company's July 22,1993, amendment application associeted with the Replacement Steam Generator Project.
On the basis of its review, the statt has determined that additional information is needed as l
discussed in the enclosed request for additional information (RAl). This request was discussed with Mr. Mark VanNoy of your staff on March 30,1999, and a mutually agreeable response of l
within 45 days from the date of this letter was established. The staff appreciates the efforts expended with respect to this matter.
I Sincerely, O
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p uu)
JYV Thomas W. Alexion, Project Manager, Section 1 Project Directorate IV & Decommissioning Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-498 and 50-499
Enclosure:
As stated cc w/ enc!: See next page
x 4
i Mr. William T. Cottle STP Nuclear Operating Company South Texas, Units 1 & 2 cc:
Mr. Comelius F. O'Keefe Jack R. Newman, Esq.
l Senior Resident inspector Morgan, Lewis & Bockius U.S. Nuclear Regulator / Commission 1800 M Street, N.W.
I P. O. Box 910 Washington, DC 20036-5869 l
Bay City, TX 77414 Mr. T. H. Cloninger Vice President A. Ramirez/C. M. Canady Engineering & Technical Services City of Austin STP Nuclear Operating Company Electric Utility Department P. O. Box 289 721 Barton Springs Road Wadsworth,TX 77483 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 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 i
Mail Code: N5012 106 S. St. Mary's Street, Suite 700 Wadsworth,TX 74483 San Antonio, TX 78205-3692 l
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 & Pcwer Co.
Austin, TX 78711-3326 P. O. Box 1700 Houston,TX 77251 l'
Judge, Matagorda County Matagorda County Courthouse 1700 Seventh Street Bay City, TX 77414
Reauest for Additional Information Replacement Steam Generator Water Level Trio Setooint Differences South Texas Proiect. Units 1 and 2 1.
Provide the results of the reanalyses of the events that rely on the new steam generator level low-low trip setpoint of 20 percent narrow range span to confirm that the I
consequences of these events meet the acceptance criteria for each event analyzed.
2.
The proposed amendment application indicates that in addition to the steam generator water level setpoint changes, the loss of nonemergency ac power to the plant auxiliaries ar.d the loss of normal feedwater flow analyses also requires two further operating changes to obtain acceptable results. These changes are: (1) modification to the pressurizer water level program, and (2) crediting the automatic operation of the steam generator atmospheric steam relief valves. Please provide the following:
a.
Discuss the new pressurizer water level program used during plant operation, b.
Confirm that pressurizer water levels assumed in the accident analysis are supported by the Technical Specifications at South Texas Project in accordance with Title 10 of the Code of Federal Reaulations (10 CFR)
Section 50.36(c)(2)(ii)(B).
c.
Confirm that the operability of the steam generator atmospheric steam relief valves are supported by the Technical Specifications at South Texas Project in accordance with 10 CFR 50.36(c)(2)(ii)(C).
i ENCLOSURE