ML20117D232

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Proposed Tech Specs Re Elevated Tube Sheet Laser Welded Sleeve
ML20117D232
Person / Time
Site: Farley  Southern Nuclear icon.png
Issue date: 08/23/1996
From:
SOUTHERN NUCLEAR OPERATING CO.
To:
Shared Package
ML20117D223 List:
References
NUDOCS 9608280209
Download: ML20117D232 (9)
v • d • e


Text

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Technical Specification Pages Replacement Pages and Marked-up Pages Unit 1 Page 3/4 4-12 Replace Page 3/4.4-12a Replace Unit 2 Page 3/4 4-12a Replace Page 3/4 4-12b Replace 9608290209 960823 '

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REACTOR C00!JJf7 SYSTEM

, , , SURVEILIANCE REQUIRDEDITS (Cantinuadi i

4.4.6.4 Acceptance criteria i .

a. As used in this Specifications i .
1. Isoerfection means an exception to the dimensions, finish or contour of a tube or sleeve from that required by fabrication drawings or specifications.

Eddy-current testing indications below 20% of the nominal wall thickness, if detectable, may be l considered as isperfections.

i

2. Deeradation means a service-induced cracking, wastage,

, wear or general cerrosion occurring on either inside

, or outside of a tube or sleeve.

3. Deeraded Tube means a tube, including the sleeve if j the tube has been repaired, that contains imperfections greater than or equal to 20% of the nominal wall thickness caused by degradation.

1

4. 4 Deeradation means the percentage of the tube or l .

sleeve weli thickness affected or removed by

.) degradation.

j A S. Defect means an imperfection of such severity that it exceeds the plugging or repair limit. A tube or A1 sleeve containing a defect is defective.

forAdoh'WM m g.81CTIM or86 h MC M65h66hhs}og 6. Pluecine or Repair Limit means the imperfection depth 4 at or beyond which the tube shall be repaired (i.e.,

M6 '\ower id of w id3Q\ed sleeved) or removed from service by plugging and is greater- than er equal to 404 et the nominal tube wall M 6VA N k W Welc N 6kEoV6 j thickness. For a tube that has been sleeved with a N #O O# ?g T 9 .O NQ mechanical joint sleeve, through well penetration of greater than er equal to 31% of sleeve nominal wall pfo'vik 0 6,sws h\\ock S(CGvc thickness in the sleeve requires the tube to be (W8db *y SkecVfcd M g&

  • removed from service by plugging. For a tube that has 165 been sleeved with a welded joint sleeve, through wall.

y%# ,4 ,enetrati- greate, than o, e,ual to m of sleeve nominal well thickness in the sleeve between the weld joints requires the tube to be removed from service by plugging. This definition does not apply to tube support plate intersections for which the weltage-based plugging criteria are being applied. Refer to 4.4.6.4.a.11 for the plugging limit applicable to these intersections. g

7. Unserviceable describes the condition of a tube or sleeve if it leaks or containa a defect large enough to affect its structural integrity in the event of an Operating Basis Earthquake, a less-of-coolant accident, or a steam line or feedwater line break as specified in 4.4.6.3.c, above.

FARLEy-UNIT 1 3/4 4-12 AMENDMDrf No.O!,?2,05 ob446, 117 m= N m .r' l 5 .

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  • suavtI:.!.MCE REQUIREMENTS (continued

, g 4h<., di I.4.- 8. Tu%e Inspeetten means en anspsette:n of the steam j

h c- fj'fW C., .I gansrator tune f rom the poant of entry that leg siden completely around the U-bend to the top support of the 1 .

/i d h go. . cold les.A For a tube that has been repatred by i A4- j r sleeving, the tube inspection should include the sleeved portion of the tube.

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, Tube sepair refers to mechanical sleeving, as described by Westinghouse report WCAP-11170, Rev. 1, l

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/g c or laser welded sleeving, as described by Westinghouse

/ y report WCAP-126724 which is used to maintain a tube in j g/cg/L., dd service or return a tube to service. This includes the removal of plugs that uere installed as a 4

. j corrective or preventive measure.

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Preservice Inspectic i means an inspection of the full

length of each tube in each steam generator performed i by eddy current techniques prior to service to

! establish a baseline condition of the tubing. This i inspection shall be performed after the field

, hydrostatic test and prist to initial POWtR ortAATION

) using the equipment and techniques espected to be used

, Or, during subs.gueat inservice inspections.

i g /t 11. Tube Support Plate Pluesine f m t is used for the

! /

/ pg dispositten of a steam generator tube for continued service that is esperiencing outside diameter stress corrosion cracking confined within the thickness of the tube support plates. These criteria are applicable for the Fourteenth operating cycle only.

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{ At tube support plate latersections, the sepair limit j

is based en estataining steam generator tube serviceability as described below:

! a. Degradaties attributed to outside diameter

stress cerrosies cracking within the bounds of i the tube support plate with bobbin voltage less j - than er equal to 2.0 volts will be allowed to

) remain la servies.

! b.

Degradaties attributed to outside diameter i stress correstem cracking within the bounds of

! the tube support plate with a bobbia voltage greater than 2.0 volts will be repaired or plugged ascept as acted la 4.4.6.4.a.11.c below.

j c. Indications of potential degradation attributed

to outside diameter stress corrosion cracking l j
  • within the bounds of the tube support plate with
a bobbia voltage greater than 2.0 volts but less j than er equal to S.6 volts may remain in service a if a rotating pancake cell inspectica does not

{ detect degradaties. Indications of outside j diameter stress corrosien cracking degradation

with a bobbia voltage greater than S.6 volts will be plugged or repaired.

FAM.ET-UWr? I 3/4 4-12a AMENDMDfT NO.96r+04,117

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REACTOR COOLANT SYSTEM SURVEILLANCE REQUIREMENTS (Continued)

6. Pluqqing or Repair Limit means the imperfection depth at or l beyond which the tube shall be repaired (i.e., sleeved) or l es removed from service by plugging and is greater than or equal

.g to 40% of the nominal tube wall thickness. This definition l

. does not apply to tubes that meet the F*/L* criteria. For a l

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tube that has been sleeved with a mechanical joint sleeve, l

4%g, M e.$h68k O O M "hrough wall penetration of greater than or equal to 31% of (g jbiMeEouAdd sleeve nominal wall thickness in the sleeve requires the tube g g Q 4 e wdled to be removed from service by plugging. For a tube that has M > g gEgc oc g'q been sleeved with a welded joint sleeve, through wall

" penetration greater than or equal to 37% of sleeve nominal wall

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  • hichness in the steeve 3etween the werd 3oints , equi,es the tAsb\\cd 5\E'W6 Wb tube to be removed from service by plugging. This definition a\\ skeved 4M @SP does not apply to tube support plate intersections for which gwsovds , - the voltage-based repair criteria are being applied. Refer to 4.4.6.4.a.14 for the repair limit applicable to these intersections.- g bA d' A
7. Unserviceable describes the condition of a tube or sleeve if it leaks or contains a defect large enough to affect its 4v\y, sheek sl6 eve ms j structural integrity in the event of an operating Basis d m l- e f e n h y Earthquake, a loss-of-coolant accident, or a steam line or b-}he i feedwater line break as specified in 4.4.6.3.c, above.

2)he %sfavn of $6 4k Age}- Meeve beloN 8. Tube Inspection means an inspection of the steam generator tube g gg from the point of entry (hot leg side) completely around the U-

, ON,i

, bend to the top support of the cold leg.3. For a tube that has Q been repaired by sleeving, the tube inspection should include the sleeved portion of the tube.

9. Tube Repair refers to mechanical sleeving, as described by Westinghouse report WCAP-lll78, Rev. 1, or laser welded sleeving as described by Westinghouse report WCAP-12672, which is used to maintain a tube in service or return a tube to service. This includes the removal of plugs that were installed as a corrective or preventive measure. I
10. Preservice Inspection means an inspection of the full length of 4

each tube in each steam generator performed by eddy current techniques prior to service to establish a baseline condition of the tubing. This inspection shall be performed af ter the '

' field hydrostatic test and prior to initial POWER OPERATION using the equipment and techniques expected to be used during subsequent inservice inspections.

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FARLEY-UNIT 2 3/4 4-12a AMENDMENT NO.

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REACTOR COOLANT SYSTEM SURVEILLANCE REQUIREMENTS (Continued) l

11. F* Distance is the distance of the expanded portion of a tube which provides a 1 sufficient length of undegraded tube expansion to resist pullout of the tube I from the tubesheet. The F* distance is equal to 1.54 inches plus allowance for l eddy current uncertainty measurement and is measured down from the top of the i tubesheet or the bottom of the roll transition, whichever is lower in i elevation. The allowance for eddy current uncertainty is documented in the {

steam generator eddy current inspection procedure. 1 l

12. F* Tube is a tube:

I a) with degradation equal to or greater than 40% below the F* distance, and b) l which has no indication of imperfections greater than or equal to 20% of '

nominal wall thickness within the F* distance, and c) that remains inservice.

If the above criteria cannot be met, then the L* tube criteria may be applied )

or the tube must be plugged or repaired.

13. L* Length is the length of the expanded portion of the tube into the tube sheet d -

from the bottom of the rolled transition or the top of the tube sheet, which I g kbt- ever is lower, that has been determined to be 0.5 inch plus allowance for eddy  !

current measurement uncertainty.

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, 14. L* Tube: a) is a tube with degradation equal or greater than 40% below the L*

4 tj f length and not degraded within the L* 1ength; b) the eddy current indication of l

'g o q.

l degradation below the L* length must be determined to be the result of cracks j "C 0 with an orientation no greater than 30 degrees from axial; c) the L* criteria 15 h shall be limited to a maximum of 600 tube ends per steam generator; d) tubes

}4 g qualifying as F* tubes are not classified as L* tubes; e) a minimum of 3.1 inches of the tube into the tubesheet from the top of tubesheet or bottom of k {0 0 the rolled transition, which ever is lower, shall be inspected using rotating f'f 3f .d, pancake coil eddy current technique or an inspection method shown to give c]d g " f e6 ,

equivalent or better information on the orientation and length of axial cracks; f) a minimum aggregate of 1.74 inches plus allowance for eddy current Og$*

jW g measurement uncertainty, of sound roll expanded tube distance with no more that f&g i

l 6 3 1 band of tube degradation in the form of axial cracking must be found in the J 00 inspected portion of the tube; or a minimum of aggregate 1.87 inches plus ric V) allowance for eddy current uncertainty, sound roll expanded tube distance with

.I p no more than 2 bands of tube degradation in the form of axial cracking must be

.I C found in the inspected portion of the tube; and g) that remains in service.

15.

,Jggd Tube Expansion is that portion of a tube which has been increased .4n diameter c by a rolling process such that no crevice exists between the outside diameter g f of the tube and the hole in the tubesheet, g l 16. Tube Support Plate Repair Limit is used for the disposition of an alloy 600 steam generator tube for continued service that is experiencing predominately axially oriented outside diameter stress corrosion cracking confined within the thickness of the tube support plates. At tube support plate intersections, the repair limit is based on maintaining steam generator tube serviceability as described below:

a. Steam generator tubes, whose degradation is attributed to outside diameter stress corrosion cracking within the bounds of the tube support plate with bobbin voltages less than or equal to the lower voltage repair limit [2.0 volts), will be allowed to remain in service.

FARLEY-UNIT 2 3/4 4-12b AMENDMENT NO.

s e.e s\ .

REACTOR COOLANT SYSTEM SURVEILLANCE REQUIREMENTS (Continued) 4.4.6.4 Acceptance Criteria

a. As used in this Specification:
1. Imperfection means an exception to the dimensions, finish or contour of a tube or sleeve from that required by fabrication drawings or specifications. Eddy-current testing indications below 20% of the nominal wall thickness, if detectable, may be considered as imperfections.
2. Deoradation means a service-induced cracking, wastage, wear or general corrosion occurring on either inside or outside of a tube or sleeve.
3. Deoraded Tube means a tube, including the sleeve if the tube has been repaired, that contains imperfections greater than or equal to 20% of the nominal wall thickness caused by degradation.
4.  % Deoradation means the percentage of the tube or sleeve wall thickness affected or removed by degradation.
5. Defect means an imperfection of such severity that it exceeds the plugging or repair limit. A tube or sleeve containing a defect is defective.
6. Pluccino or Repair Limit means the imperfection depth at or beyond which the tube shall be repaired (i.e., sleeved) or removed from service by plugging and is greater than or equal to 40% of the nominal tube wall thickness. For a tube that has been sleeved with a mechanical joint sleeve, through wall penetration of greater than or equal to 31% of sleeve nominal wall thickness in the sleeve requires the tube to be removed from service by plugging. For a tube that has been sleeved with a welded joint sleeve, through wall penetration greater than or equal to 37% of sleeve nominal wall thickness in the sleeve between the weld joints requires the tube to be removed from service by plugging. This definition does not apply to tube support plate intersections for which the voltage-based plugging criteria are being applied. Refer to 4.4.6.4.a.11 for the plugging limit applicable to these intersections. For a tube with an imperfection or flaw in the tube sheet below the lower joint of an installed elevated laser welded sleeve, no repair or plugging is required provided the installed sleeve meets all sleeved tube inspection requirements.
7. Unserviceable describes the condition of a tube or sleeve 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 as specified in 4.4.6.3.c, above.

FARLEY-UNIT 1 3/4 4-12 AMENDMENT NO.

)

1

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, REACTOR COOLANT SYSTEM  !

l

, SURVEILLANCE REQUIREMENTS (Continued)

8. Tube Insoection means an inspection of the steam generator tube i 4

from the point of entry (hot leg side) completely around the U- l bend to the top support of the cold leg. For a tube with a '

tubesheet sleeve installed, the point of entry is the bottom of the tube sheet sleeve below the lower sleeve joint. For a tube i that has been repaired by sleeving, the tube inspection should include the sleeved portion of the tube.

9. Tube Repair refers to mechanical sleeving, as described by l Westinghouse report WCAP-11178, Rev. 1, or laser welded

, sleeving, as described by Westinghouse report WCAP-12672, or for elevated sleeves, Southern Nuclear letter dated August xx, 1996 which is used to maintain a tube in service or return a tube to service. This includes the removal of plugs that were installed as a corrective or preventive measure.

10. Preservice Inspection means an inspection of the full length of each tube in each steam generator performed by eddy current techniques prior to service to establish a baseline condition of the tubing. This inspection shall be performed after the field hydrostatic test and prior to initial POWER OPERATION using the equipment and techniques expected to be used during subsequent inservice inspections.

, 11. Tube Support Plate Pluccina Limit is used for the disposition of a steam generator tube for continued service that is experiencing outside diameter stress corrosion cracking confined within the thickness of the tube support plates. These criteria are applicable for the Fourteenth operating cycle only. At tube

, support plate intersections, the repair limit is based on j maintaining steam generator tube serviceability as described

  • l below:

l

a. Degradation attributed to outside diameter stress i corrosion cracking within the bounds of the tube support plate with bobbin voltage less than or equal to 2.0 volts i will be allowed to remain in service, l

l

b. Degradation attributed to outside diameter stress corrosion cracking within the bounds of the tube support plate with a bobbin voltage greater than 2.0 volts will be
repaired or plugged except as noted in 4.4.6.4.a.11.c below.

) c. Indications of potential degradation attributed to outside diameter stress corrosion cracking within the bounds of the tube support plate with a bobbin voltage greater than 2.0 volts but less than or equal to 5.6 volts may remain in service if a rotating pancake coil inspection does not detect degradation. Indications of outside diameter stress corrosion cracking degradation with a bobbin voltage greater than 5.6 volts will be plugged or repaired.

FARLEY-UNIT 1 3/4 4-12a AMENDMENT NO.

a Na . * , .

REACTOR COOLANT SYSTEM SUREEILLANCE REQUIREMENTS (Continued)

6. Plucaina or Repair Limit means the imperfection depth at or beyond which the tube shall be repaired (i.e., sleeved) or removed from service by plugging and is greater than or equal to 40% of the nominal tube wall thickness. This definition does not apply to tubes that meet the F*/L* criteria. For a tube that has been sleeved with a mechanical joint sleeve, through wall penetration of greater than or equal to 31% of sleeve nominal wall thickness in the sleeve requires the tube to be removed from service by plugging. For a tube that has been sleeved with a welded joint sleeve, through wall penetration greater than or equal to 37% of sleeve nominal wall thickness in the sleeve between the weld joints requires the tube to be removed from service by plugging.

This definition does not apply to tube support plate intersections for which the voltage-based repair criteria are being applied.

Refer to 4.4.6.4.a.14 for the repair limit applicable to these intersections. For a tube with an imperfection or flaw in the tube sheet below the lower joint of an installed elevated laser welded sleeve, no repair or plugging is required provided the installed sleeve meets all sleeved tube inspection requirements.

7. Unserviceable describes the condition of a tube or sleeve 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 as specified in 4.4.6.3.c, above.
8. Tube Inspection means an inspection of the steam generator tube i from the point of entry (hot leg side) completely around the U- '

bend to the top support of the cold leg. For a tube with a tube sheet sleeve installed, the point of entry is the bottom of the j tube sheet sleeve below the lower sleeve joint. For a tube that i has been repaired by sleeving, the tube inspection should include i the sleeved portion of the tube.

9. Tube Repair refers to mechanical sleeving, as described by Westinghouse report WCAP-11178, Rev. 1, or laser welded sleeving as described by Westinghouse report WCAP-12672, or, for elevated sleeves, Southern Nuclear letter dated August , 1996, which is used to maintain a tube in service or return a tube to service.

This includes the removal of plugs that were installed as a corrective or preventive measure.

10. Preservice Inspection means an inspection of the full length of each tube in each steam generator performed by eddy current techniques prior to service to establish a baseline condition of the tubing. This inspection shall be performed after the field hydrostatic test and prior to initial POWER OPERATION using the equipment and techniques expected to be used during subsequent inservice inspections.
11. F* Distance is the distance of the expanded portion of a tube which provides a sufficient length of undegraded tube expansion to resist pullout of the tube from the tubesheet. The F* distance is equal to 1.54 inches plus allowance for eddy current uncertainty measurement and is measured down from the top of the tubesheet or the bottom of the roll transition, whichever is lower in elevation. The allowance for eddy current uncertainty is documented in the steam generator eddy current inspection procedure.

FARLEY-UNIT 2 3/4 4-12a AMENDMENT NO.

e %d . % .

REACTO_R COOLANT SYSTEM SURVEILLANCE REQUIREMENTS (Continued)

12. F* Tube is a tubes a) with degradation equal to or greater than 40% below the F* distance, and b) which has no indication of imperfections greater than or equal to 20% of nominal wall thickness within the F* distance, and c) that remains inservice.

If the above criteria cannot be met, then the L* tube criteria may be applied or the tube must be plugged or repaired.

13. L* Lenoth is the length of the expanded portion of the tube into the tube sheet from the bottom of the rolled transition or the top of the tube sheet, which ever is lower, that has been determined i to be 0.5 inch plus allowance for eddy current measurement '

uncertainty.

14. L* Tubes a) is a tube with degradation equal or greater than 40%

below the L* length and not degraded within the L* length; b) the eddy current indication of degradation below the L* length must be determined to be the result of cracks with an orientation no  ;

greater than 30 degrees from axial; c) the L* criteria shall be limited to a maximum of 600 tube ends per steam generator; d) i tubes qualifying as F* tubes are not classified as L* tubes; e) a  ;

minimum of 3.1 inches of the tube into the tubesheet from the top l of tubesheet or bottom of the rolled transition, which ever is '

lower, shall be inspected using rotating pancake coil eddy current technique or an inspection method shown to give equivalent or better information on the orientation and length of axial cracks; f) a minimum aggregate of 1.74 inches plus allowance for eddy current measurement uncertainty, of sound roll expanded tube distance with no more that 1 band of tube degradation in the form of axial cracking must be found in the inspected portion of the tube; or a minimum of aggregate 1.87 inches plus allowance for i

]

eddy current uncertainty, sound roll expanded tube distance with j 4 no more than 2 bands of tube degradation in the form of axial 1 cracking must be found in the inspected portion of the tube; and i g) that remains in service. I

15. Tube Expansion is that portion of a tube which has been increased in diameter by a rolling process such that no crevice exists between the outside diameter of the tube and the hole in the tubesheet. Tube expansion also refers to that portion of a sleeve .

which has been increased in diameter by a rolling process such that no crevice exists between the outside diameter of the sleeve and the parent steam generator tube.

16. Tube Support Plate Repair Limit is used for the disposition of an alloy 600 steam generator tube for continued service that is experiencing predominately axially oriented outside diameter stress corrosion cracking confined within the thickness of the tube support plates. At tube support plate intersections, the repair limit is based on maintaining steam generator tube serviceability as described belows
a. Steam generator tubes, whose degradation is attributed to outside diameter stress corrosion cracking within the bounds of the tube support plate with bobbin voltages less than or equal to the lower voltage repair limit [2.0 volts), will be allowed to remain in service.

FARLEY-UNIT 2 3/4 4-12b AMENDMENT NO.

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