ML051300243

Special Report - Steam Generator Tube Inservice Examination

ML051300243
Person / Time
Site:	Millstone
Issue date:	05/02/2005
From:	Price J Dominion Nuclear Connecticut
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
05-282, FOIA/PA-2005-0210
Download: ML051300243 (4)

Text

Dominion Nuclear Connecticut, Inc. lr h *

• Millstone Power Station :51 Dominion Rope Ferry Road Waterford, CT17 06385 MAY 2 2005 U. S. Nuclear Regulatory Commission Serial No.: 05-282 Attention: Document Control Desk MPS Lic/RWM Rev 0 Washington, DC 20555 Docket No.: 50-336 License No.: DPR-65 DOMINION NUCLEAR CONNECTICUT. INC.

MILLSTONE POWER STATION, UNIT 2 SPECIAL REPORT - STEAM GENERATOR TUBE INSERVICE EXAMINATION This special report is being submitted pursuant to the requirements of Plant Technical Specifications 4.4.5.1.5.a. Specification 4.4.5.1.5.a requires that a report be submitted to the commission within 15 days following completion of each inservice inspection of the steam generator tubes to document the number of tubes plugged in each generator.

Eddy current inspections, conducted at the end of cycle 16, were completed on April 25, 2005. One hundred percent of the tubes in steam generator (SG) number 1, or approximately fifty percent of the total population of tubes in all SGs, were examined.

No tubes were removed from service as a result of the examination.

The tables contained within Attachment 1 briefly summarize the number of tubes examined, types of examinations, and results. Eddy current testing (ECT) identified flaws in two tubes resulting from fan bar wear (less than 9 percent through wall). No further growth was observed since initial identification of these flaws during the refueling outage for cycle 14. Loose parts that were expected due to degradation of a condensate strainer screen have been removed from both steam generators during sludge lancing and the Foreign Object Search and Retrieval (FOSAR). No foreign material related damage was identified. The complete results of the SG tube inspection will be included in the Annual Operating Report.

If you should have any questions regarding this submittal, please contact Mr. Dave W.

Dodson at (860) 447-1719, extension 2346.

Very truly yours, J. Price Site ice President - Millstone Commitments contained within this letter: None cc: See next page

Serial No.: 05-282 Docket No.: 50-336 Special Report for SG Inspections Page 2 Attachments: Tables 1 and 2 cc: U. S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 Mr. V. Nerses Senior Project Manager, Millstone Unit 2 U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 8C2 Rockville, MD 20852-2738 Mr. S. M. Schneider NRC Senior Resident Inspector Millstone Power Station

Serial No.: 05-282 Docket No.: 50-336 Special Report for SG Inspections ATTACHMENT 1 TABLES 1 AND 2 DOMINION NUCLEAR CONNECTICUT, INC. (DNC)

MILLSTONE POWER STATION, UNIT 2

Serial No.: 05-282 Docket No.: 50-336 Special Report for SG Inspections Attachment 1 / Page 1 of 1 Table 1: Refueling Outage 16 Eddy Current Test Summary Number of Tubes (SG 1 Only) 8522 Number of Tubes Inspected F/L w/Bobbin Probe 8522 Number of Locations Inspected w/Rotating Probe (Total) 298

• Hot Leg Transitions - Original Scope 142

• Hot Leg Transitions - Expansion 0

• Hot Leg Misc. Special Interest - Diagnostic Exams 60

• Cold Leg Misc. Special Interest - Diagnostic Exams 82

• U-bend Misc. Special Interest - Diagnostic Exams 14 Tubes with Max Fan Bar Wear >= 40% 0 Tubes with Max Fan Bar Wear >= 20% but < 40% 0 Tubes with Max Fan Bar Wear <20% 2 Tubes Plugged 0 Tubes Sleeved 0 Table 2: Rotating Probe Diagnostic Exams from Historical and Current Indications Hot Leg Cold Leg U-bend PTE 1 0 0 PLP 2 4 0 Previous DNT/DNG 3 9 8 Indications BLG 2 0 0 OXP 19 14 0 Fan Bar Wear 0 0 1 Bobbin I-Codes 3 0 2 Refueling Bobbin PLPs 3 8 0 Outage 16 PLP Bounding and 27 46 0 Indications Resulting PLPs -

DNT/DNG 0 1 3 Total 60 82 14