ML20217M619

Proposed Tech Specs Incorporating C-E SG Welded Sleeve TR, CEN-629-P,Rev 1

ML20217M619
Person / Time
Site:	Prairie Island
Issue date:	08/15/1997
From:	NORTHERN STATES POWER CO.
To:
Shared Package
ML19317C664	List: ML20217M596 ML20217M619 ML20217M869
References
NUDOCS 9708250100
Download: ML20217M619 (5)

Text

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4 ATTACHMENT 2 Proposed Changes Marked Up on Existing Technical Specification Page ,

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' TS.4.12 4

, D.- Acceptance Criteria PE" ?!? 5/15/95

1. As us3d in this Specification:

(a) Imperfection means an exception to the dimensions, finish or contour of a tube from that required by fabrication drawings or specifications. Eddy-current testing indications below 20% f the nominal tube wall thickness, if detectable, may be considered as imperfections.

(b) Derradation means a service-induced cracking, vastage wear or general corrosion occurring on either inside or outside of a tube.

(c) Derraded Tube means a tube containing imperfections h20% of the nominal wall thickness caused by degradation.

(d)  % Deeradation means the percentage of the tube wall thickness affected or removed by degradation.

(o) Defect means an imperfection depth at or beyond exceeds the repsir limit. A-tube containing a defect is defective.

(f) Renair Limit means the imperfection depth at or beyond which the tube shall be removed from service by plugging or repaired by sleeving because it may become unserviceable prior to the next inspection and is equal to 50% of the nominal tube wall thickness. If significant general tube thinning occurs, this criteria will be reduced to 40% wall penetration. This definition does not apply to the portion of the tube in the tubesheet below the F* distance provided the tube is no, degraded (i.e., no indications of cracks) within the F*

distance for F* tubes.ThRrepairSlimit2forFtheYp' ressurs boundary?rsgiohjMny[sleevet i sMingfithhnom,inalbloei@All thicknesaj (g) Unserviceable describes the condition of a tube if it leaks or contains a defect large enough to affect its structural integrity in the event of an Operating Basis Earthquake, a luss of coolant accident, or a steam line or feedwater line break, (h) Tube Inspection means an inspection of the steam generator tubo from the point of entry (hot leg side) completely around the U-bend to the top support of the cold leg.

(i) Sleevine mese: that tub: 21::ving in per:::itted enl. ir :::::

uber th: 21:::: pen the tuberhe t cre and rh :: lever je h 1^  : th^ r cF7 fluff tub ^h^^1 f; ^ 15IthAN EPatr76f de_gradedM"be@tregions'usingainewfAlloy1690;tubingtsleev_e inse rte d binside kthe / parentdube;: and t sc aledt a cme achiandi by theslowursw'ldlih(a?fd111dipthTf1 e

yeldingidrj tubesheettsleeve;with;at bygr6 placing ,hardtro11ed fj ointM The? new3 sleeve becomestthe1 pressure 3oundarytspanningithogoriginalsdegraded tubefregioni (j) F* Distance is the distance from the bottom of the hardroll transition toward the bottom of the tubesheet that has been conservatively determined to be 1.07 inches (not including eddy current uncertainty).

(k) F* Tube is a tube with degradation, below the F* distance, equal to or greater than 40%, and not degraded (i.e., no indications or cracking) within the F* distance.

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Attachment 3 Revised Technical Specification Page

TS.6.12 4 D. Acceptance Criteria

-1. As used in this Specification:

(a) Imperfection means an exception to the dimensions, finish or contour of a tube from that required by fabrication drawings or specifications. Eddy-current testing indications below 20% f the nominal tube wall thickness, if detectable, may be considered as imperfections.

(b) Deeradation means a service-induced cracking, wastage wear or general corrosion occurring on either inside or outside of a tube.

(c) Decraded Tube means a tube containing imperfections h20% of the nominal wall thickness caused by degradation.

(d)  % Decradation means the percentage of the tube wall thickness affected or removed by degradation.

(e) Defect means an imperfection depth at or beyond exceeds the repair limit. A tube containing a defect is defective.

(f) Repair Limit means the imperfection depth at or beyond which the tube shall be removed from service by pluggi.1g or repaired by sleeving because it may become unserviceable prior to the next inspection and is equal to 50% of the nominal tube wall thickness. If significant general tube thinning occurs, this criteria will be reduced to 40% wall penetrati.on. This definition does not apply to the portion of the tube in the tubesheet below the F* distance provided the tube is not degraded (i.e., no indications of cracks) within the F*

distance for F* tubes. The repair limit for the pressure boundary region of any sleeve is 31% of the nominal sleeve wall thickness.

(g) Unserviceable describes the condition of a tube if it leaks or contains a defect large enough to affect its structural integrity in the event of an Operating Basis Earthquake, a loss-of-coolant accident, or a steam line or feedwater line break.

(h) Tube Inspection means an inspection of the steam generator tube from the point of entry (hot leg side) completely around the U-bend to the top support of the cold leg.

(i) Sleevine is the repair of degraded tube regions using a new Alloy 690 tubing sleeve inserted inside the parent tube and sealed at each end by welding or by replacing the lower weld in a full depth tubesheet sleeve with a hard rolled joint. The new sleeve becomes the pressure boundary spanning the original degraded tube region.

(j) F* Distance is the distance from the bottom of the hardroll transition toward the bottom of the tubesheet that has been conservatively determined to be 1.07 inches (not including eddy current uncertainty).

(k) F* Tubo is a tube with degradation, below the F* distance, equal to or greater than 40%, and not degraded (i.e., no indications or cracking) within the F* distance.

Atte.chment 5 Combustion Engineering Report CEN-629 P, Addendum 1

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Revision i k

Repair of Westinghouse Series 44 and 51 Steam Generator Tubes Using Leak Tight Sleeves FINAL REPORT August 1997 I Non-Proprietary Version R

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