NOC-AE-03001581, Reactor Pressure Vessel Head Inspection Results

Reactor Pressure Vessel Head Inspection Results

ML032330260
Person / Time
Site:	South Texas
Issue date:	08/18/2003
From:	Jordan T South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NOC-AE-03001581, STI:31643574
Download: ML032330260 (3)

Text

Nuclear Operating Company August 18, 2003 NOC-AE-0300 1581 U. S. Nuclear Regulatory Commission Attention: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852 South Texas Project Unit 1 Docket No. STN 50-498 STP Unit 1 Reactor Pressure Vessel Head Inspection Results

References:

1. NRC Order EA-03-009, Interim Inspection Requirements for Reactor Pressure Vessel Heads at Pressurized Water Reactors In accordance with Paragraph C(3)(a) of Reference 1, STPNOC performed a bare metal visual examination of the STP Unit 1 reactor pressure vessel (RPV) upper head during the unit's Spring 2003 refueling outage.

STPNOC performed the bare metal visual (BMV) of the upper bead as described in MRP-75.

The inspection was performed with a robot that had a front and back camera with lights, augmented with a borescope. The scope of the inspection was as described in STPNOC's response to Bulletin 2002-01, Item 1.D and is attached for the reviewers' convenience.

STPNOC was able to view all the reactor head penetrations with a combination of the robot and borescope. There were no relevant indications. No cracking, leakage, or wastage was found. All inspections were videotaped.

If you should have any questions regarding this submittal, please contact me at 361-972-7902 or Mr. Michael Lashley at 361-972-7523. o Vice President, Engineering and Technical Services awh

Attachment:

Description of Inspection 4 A 03001581 Unit 1 RPV bead inspection results.docST:3654 STI: 31643574

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NOC-AE-03001581 Page 2 cc:

(paper copy) (electronic copy)

Regional Administrator, Region IV A. H. Gutterman, Esquire U. S. Nuclear Regulatory Commission Morgan, Lewis & Bockius LLP 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 L. D. Blaylock City Public Service U. S. Nuclear Regulatory Commission David H. Jaffe Attention: Document Control Desk U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike R. L. Balcom Rockville, MD 20852 Texas Genco, LP Richard A. Ratliff A. Ramirez Bureau of Radiation Control City of Austin Texas Department of Health 1100 West 49th Street C. A. Johnson Austin, TX 78756-3189 AEP Texas Central Company Jeffrey Cruz Jon C. Wood U. S. Nuclear Regulatory Commission Matthews & Branscomb P. O. Box 289, Mail Code: MN1 16 Wadsworth, TX 77483 C. M. Canady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704

NOC-AE-03001581 Attachment Page 1 Description of Inspection Inspection Method The visual inspections under the insulation will be via video camera delivered either manually or by a remotely controlled crawler. Less accessible areas may be inspected via other video equipment.

Personnel Qualifications An evaluation team composed of personnel qualified at a minimum as VT-2 Level II and cognizant engineering staff will evaluate the results of the visual inspection.

Inspection System Qualification The tools and techniques employed for the inspections will meet the standards of the ASME B&PV Code,Section XI, 1989 edition, IWA-2210 for VT-2 examinations with respect to resolution capabilities and lighting.

Scope The inspections will be performed on a best-effort basis with a goal of 100% coverage of the reactor vessel head under the insulation, but as a minimum sufficient to support an engineering evaluation of the condition of the vessel head outer surface.

Acceptance Criteria Accumulations of boric acid residue found on the reactor vessel head will be investigated sufficiently to determine their origin. Discolored surfaces or areas with boric acid build-up will be given particular attention to determine, to the extent possible with visual examination equipment, if the surface below the residue is sound. If necessary, supplemental investigation aids such as scrapers, brushes, compressed air and water washing will be applied to suspect areas to assist in the resolution of these areas.

Boric acid residue whose source is determined to originate in the juncture annulus of a head penetration tube and the head will be cause for immediate in-depth investigation to determine the severity of the defect.

Boric acid residue from sources other than a penetration tube juncture will be investigated and corrective measures will be taken regarding the termination of the leak source and the arrest of any corrosive attack on the head.

Frequency As required by Order EA-03-009.