ML052630209
| ML052630209 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 09/07/2005 |
| From: | Jaffe D NRC/NRR/DLPM/LPD4 |
| To: | Sheppard J South Texas |
| Jaffe D, NRR/DLPM, 415-1439 | |
| References | |
| BL-03-002, TAC MC0566 | |
| Download: ML052630209 (6) | |
Text
September 7, 2005 Mr. James J. Sheppard President and Chief Operating Officer STP Nuclear Operating Company South Texas Project Electric Generating Station P. O. Box 289 Wadsworth, TX 77483
SUBJECT:
SOUTH TEXAS PROJECT (STP), UNIT 1 - RESPONSE TO U.S.
NUCLEAR REGULATORY COMMISSION BULLETIN 2003-02, LEAKAGE FROM REACTOR PRESSURE VESSEL LOWER HEAD PENETRATIONS AND REACTOR COOLANT PRESSURE BOUNDARY INTEGRITY (TAC NO. MC0566)
Dear Mr. Sheppard:
On August 21, 2003, the U.S. Nuclear Regulatory Commission (NRC) issued NRC Bulletin 2003-02, Leakage from Reactor Pressure Vessel Lower Head Penetrations and Reactor Coolant Pressure Boundary Integrity, to the industry. This Bulletin informed addressees that current methods of inspecting the reactor pressure vessel (RPV) lower heads may need to be supplemented with bare-metal visual inspections in order to detect reactor coolant pressure boundary leakage and requested these addressees provide the NRC with information related to inspections that have been performed to verify the integrity of the RPV lower head penetrations.
The Bulletin requested that addressees provide a description of the RPV lower head penetration inspection program that would be implemented at their respective plants during the next and subsequent refueling outages. This description was to include the extent of the inspection, the inspection methods to be used, the qualification standards for the inspection methods, the process used to resolve the source of findings of boric acid deposits or corrosion, the inspection documentation to be generated, and the basis for concluding that their plant satisfied applicable regulatory requirements related to the structural and leakage integrity of the RPV lower head penetrations.
By letter dated November 4, 2003, as supplemented by letter dated June 7, 2004, STP Nuclear Operating Company (STPNOC) provided its response to this request for STP, Unit 1. In its November 4, 2003, submittal, STPNOC indicated that bare-metal visual inspections of all 58 RPV lower head penetrations are performed during each refueling outage and selected forced outages. On April 12, 2003, STPNOC discovered reactor coolant leakage at penetrations 1 and 46. Subsequent ultrasonic (UT), eddy current, and visual examinations confirmed that there was no evidence of cracking on the remaining 56 penetrations.
Penetrations 1 and 46 were successfully repaired. In its letter dated July 17, 2003, STPNOC committed to perform volumetric and enhanced visual examinations of the RPV lower head penetrations at the next in-service inspection of the RPV.
J. Sheppard STPNOC also committed to perform UT examinations of the RPV base metal around the two repaired penetrations at future selected refueling outages to confirm there are no indications of RPV wastage from reactor coolant water in the gap area of the repaired penetrations. As such, STPNOC is requested to notify the NRC staff in writing of any changes to this commitment prior to implementation.
The Bulletin also requested that addressees provide a summary of the RPV lower head penetration inspection that was performed at their plants, the extent of the inspection and the methods used, a description of the as-found condition of the lower head, any findings of relevant indications of through-wall leakage, and a summary of the disposition of any findings of boric acid deposits and any corrective actions taken as a result of indications found.
By letter dated June 2, 2005, STPNOC provided a summary of its inspection results from the spring 2005 refueling outage at STP, Unit 1. STPNOC reported it had performed a bare-metal visual inspection of the RPV lower head, including an inspection of the entire annulus of each of the 58 RPV lower head penetrations. STPNOC did not observe any evidence of RPV lower head penetration leakage.
Based on its review of STPNOCs responses, the NRC staff finds that STPNOC has met the reporting requirements of the Bulletin for STP, Unit 1. Accordingly, TAC No. MC0566 is closed for STP, Unit 1.
Sincerely,
/RA/
David H. Jaffe, Senior Project Manager, Section 1 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No.: 50-498 cc: See next page
ML OFFICE PDIV-1/PM PDIV-1/LA LPM EMCB PDIV-1/SC NAME DJaffe DBaxley SMonarque ESullivan DTerao DATE 09/05/2005 09/06/2005 08/29/2005 08/29/2005 9/7/05
June 2005 South Texas Project, Units 1 & 2 cc:
Senior Resident Inspector U.S. Nuclear Regulatory Commission P. O. Box 910 Bay City, TX 77414 C. Kirksey/C. M. Canady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704 Mr. J. J. Nesrsta Mr. R. K. Temple City Public Service Board P. O. Box 1771 San Antonio, TX 78296 INPO Records Center 700 Galleria Parkway Atlanta, GA 30339-3064 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 Jack A. Fusco/Michael A. Reed Texas Genco, LP 12301 Kurland Drive Houston, TX 77034 Judge, Matagorda County Matagorda County Courthouse 1700 Seventh Street Bay City, TX 77414 A. H. Gutterman, Esq.
Morgan, Lewis & Bockius 1111 Pennsylvania Avenue, NW Washington, DC 20004 E. D. Halpin Vice President Oversight STP Nuclear Operating Company P. O. Box 289 Wadsworth, TX 77483 S. M. Head, Manager, Licensing STP Nuclear Operating Company P. O. Box 289, Mail Code: N5014 Wadsworth, TX 77483 Environmental and Natural Resources Policy Director P. O. Box 12428 Austin, TX 78711-3189 Jon C. Wood Cox Smith Matthews 112 East Pecan, Suite 1800 San Antonio, TX 78205 Director Division of Compliance & Inspection Bureau of Radiation Control Texas Department of State Health Services 1100 West 49th Street Austin, TX 78756 Brian Almon Public Utility Commission William B. Travis Building P. O. Box 13326 1701 North Congress Avenue Austin, TX 78701-3326 Susan M. Jablonski Office of Permitting, Remediation and Registration Texas Commission on Environmental Quality MC-122 P.O. Box 13087 Austin, TX 78711-3087
South Texas Project, Units 1 & 2 Mr. Terry Parks, Chief Inspector Texas Department of Licensing and Regulation Boiler Division P. O. Box 12157 Austin, TX 78711 Mr. Ted Enos 4200 South Hulen Suite 630 Ft. Worth, Texas 76109