ML20203K975
| ML20203K975 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 02/26/1998 |
| From: | Katz P BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20203K977 | List: |
| References | |
| NUDOCS 9803050293 | |
| Download: ML20203K975 (2) | |
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e PrTra E. K4Tt Baltimore Gas and Electric Company Plant Ger.eral Manager Calvert Cliffs Nuclear Power Plant Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410 495 4101 February 26,1997 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENilON:
Document Control Desk SUILIECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 1997 Steam Generator Tube Insnection Results Report REFEllENCE:
(a)
Calvert Cliffs Units I and 2 Technical Specifications 4.4.5.5.b Reference (a) requires that we report, on an annual basis, the results of the steam generator tube inservice inspection conducted in the past year. This letter provides the steam generator tube examinatior.s conducted on the Unit 2 steam generators during the spring of 1997. No similar inspections were conducted on the Unit I steam generators in 1997. This report includes the number and extent of tubes examined, imperfections noted, and the identity of tubes plugged. Th, Unit 2 steam generator tube inspection results required 277 total tubes to be plugged in No. 21 Steam Generator and 214 total tubes to be plugged in No. 22 Steam Generator. The number of circumferential flaws detected were 8 in No. 21 Steam Generator and 36 in No. 22 Steam Gcnerator.
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INSPECTION SCOPE The examination of Calvert Cliffs Unit 2 Steam Generators (Nos. 21 and 22) consisted of bobbin coil and motorized rotating plus point inspection technologies. All distortec. bobbin coil indications were dispositioned with the plus point probe. The table below identifies the number and extent of tubes inspected.
Inupection Zones Number of Tube Extent Tubes in Zone Examined (SG21/SG22) l i
100% Full Length Bobbin 8092/8290 tube end to dl Coil tube end
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- " U 100% Plus Point on top of 8092/8290 TSH minus 1" hot leg tube sheet to TSH plus 5" 20% Plus Point on top of 1618/1658 TSC minus 1" cold leg tube sheet to TSC plus 5" kk\\,[hkkkkhk1 9803050293 980226 PDR ADOCK 05000317 G
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February 26,1998 l
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Inspection Zones Number of Tube Extent Tubes in Zone Examined (SG21/SG22) 20% Plus Point at the uppar 1236/1080 04H Egg Crate tube bundle locations (plus to Vedical expansions)
Middle 20% Plus Point at tubes 722/637 06H Egg Crate with U-bends (plus to 06C Egg expansions)
Crate 20% Plus Point at dented 106'258 NA support plate intersections 20% Plus Point at installed 100/100 NA rolled mechanical plugs SG = Steam Generator T5fl = Tubesheet Hot TSC = Tubesheet Cold EDDY CUPD.ENT INSPECTION RESULTS Attachment (1) contains the results of the motorized rotating plus point and bobbin coil exams for Steam Generator Nos. 21 and 22. All steam generator tubes with crack like indications, both circumferential and axial, and all tubes with volumetric indications were removed from service.
Should you have quest'ons regarding this matter, we will be pleased to discuss them with you.
Very truly yours, E.
Attachment (1): Results of Bobbin Coil and Motorized Rotating Plus Point Exams for Unit 2 Steam Generators Nos. 21 cnd 22.
cc:
H. J. Miller, NRC Without Attachment R. S. Fleishman, Esquire Resident inspector, NRC J. E. Silberg, Esquire R. I. McLean, DNR A. W. Dromerick, NRC J. H. Walter, PSC Director, Project Directorate 1-1, NRC