ML052000279
| ML052000279 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 07/13/2005 |
| From: | Jordan T South Texas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| BL-03-001, NOC-AE-05001883, STI: 31880802, TAC MB9615, TAC MB9616 | |
| Download: ML052000279 (4) | |
Text
Nuclear Operating Company SoGrh TCJ35PctknbSLstion P0. Bar 289 Thdsw.pnls Tciz 77483 _______ _
July 13, 2005 NOC-AE-05001883 1 OCFR50.54(f)
U. S. Nuclear Regulatory Commission Attention: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852 South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Response to a Request for Additional Information Regarding the 60 Day Response to Bulletin 2003-01: "Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized-Water Reactors (TAC Nos. MB9615 and MB9616)
References:
- 1. Letter, Thomas J. Jordan to NRC Document Control Desk, "60-day response to NRC Bulletin 2003-01," dated August 7, 2003 (NOC-AE-03001569)
- 2. Letter, Thomas J. Jordan to NRC Document Control Desk, "Request for additional Information Regarding Bulletin 2003-01, Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized-Water Reactors Dated November 11, 2004 (NOC-AE-04001793). of this letter is in response to a request for additional information from the NRC staff regarding the STP Nuclear Operating Company's 60 Day Response to Bulletin 2003-01.
There are no commitments contained in this letter.
If there are any questions regarding this response, please contact Scott Head at (361) 972-7136 or me at (361) 972-7902.
I declare under penalty of perjury that the foregoing is true and correct.
Executed on J,)t 13 r an Vice President, Engineering jaV Attachmentl:
Response to a Request for Additional Information Regarding the 60 Day Response to Bulletin 2003-01.
STI: 31880802
NOC-AE-05001 883 Page 2 of 2 cc:
(paper copy)
(electronic copy)
Bruce S. Mallett Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Richard A. Ratliff Bureau of Radiation Control Texas Department of Health 1100 West 49th Street Austin, TX 78756-3189 Jeffrey Cruz U. S. Nuclear Regulatory Commission P. O. Box 289, Mail Code: MN116 Wadsworth, TX 77483 C. M. Canady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704 A. H. Gutterman, Esquire Morgan, Lewis & Bockius LLP David H. Jaffe U. S. Nuclear Regulatory Commission Jon C. Wood Cox Smith Matthews C. Kirksey City of Austin J. J. Nesrsta R. K. Temple E. Alarcon City of San Antonio Jack A. Fusco Michael A. Reed Texas Genco, LP
NOC-AE-05001 883 Page 1 of 2 Response to a Request for Additional Information Regarding the 60 Day Response to Bulletin 2003-01: "Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized-Water Reactors
- 1. Has WOG COA A la been rejected by STP? (WOG COA A la is securing of one containment spray pump prior to recirculation).
STP Response:
STP has not rejected WOG COA Ala. STP is a three-train plant and has three Containment Spray (CS) Pumps. Based on single failure criteria, one out of the three CS Pumps may be secured and still meet the current design basis.
Therefore, STP has revised the appropriate Emergency Operating Procedures (EOPs) accordingly. Specifically if a CS actuation occurs and all three CS pumps are in service, then the EOPs will allow one CS pump to be secured.
- 2. Has WOG COA A lb been rejected by STP? (WOG COA A lb is securing of more than one containment spray pump prior to recirculation).
STP Response:
With less than two trains of CS, STP cannot ensure that doses to control room operators will remain less than General Design Criteria (GDC) 19 limits for the Design Basis Loss of Cooling Accident (LOCA) with the current licensed technology.
Therefore, STP will not incorporate COA Alb.
- 3. In what way do STPEOPs "presently and adequately address refllling the RWST?"- upon loss of recirculation or only when sump clogging occurs?
(WOG COA A5-Refill of Refueling Water Storage Tank).
STP Response:
STP currently refills the RWST when the loss of recirculation capability occurs. In addition, STP has revised the "TRANSFER TO COLD LEG RECIRCULATION" procedure to commence refilling the RWST after verification of proper swap over to cold leg recirculation.
NOC-AE-05001 883 Page 2 of 2
- 4. In what way does STPaddress WOG COA A6 6nject More than one RWST volume froma refilled RWSTorbybypassing the RWST?'
STP Response:
STP has the guidance to inject more than one RWST volume. The additional RWST total volume to be added will be coordinated with the Technical Support Center (TSC).