ML062830030

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Submittal of Supplement 3 to Proposed Change Number NPF-10/15-565 License Amendment Request, Proposed Technical Specification Change, Define the Extent of the Required Tube Inspections and Repair Criteria within the Tubesheet.
ML062830030
Person / Time
Site: San Onofre  Southern California Edison icon.png
Issue date: 10/05/2006
From: Katz B
Southern California Edison Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC MC8850, TAC MC8851
Download: ML062830030 (21)
v • d • e


Text

SOUTHERN CALIFORNIA Brian Katz EDISON' Vice President An EDISON INTERNATIONALa Company October 5, 2006 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Subject:

San Onofre Nuclear Generating Station, Units 2 and 3 Docket Nos.

50-361 and 50-362 Submittal of Supplement 3 to Proposed Change Number NPF-10115-565 License Amendment Request, "Proposed Technical Specification Change, Define the Extent of the Required Tube Inspections and Repair Criteria within the Tubesheet Region of the Steam Generators"

References:

1. Letter from Brian Katz (SCE) to NRC (Document Control Desk) Dated November 3, 2005,

Subject:

San Onofre Nuclear Generating Station, Units 2 and 3, Docket Nos. 50-361 and 50-362, Proposed Change Number NPF-10/15-565, License Amendment Request, "Proposed Technical Specification Change, Define the Extent of the Required Tube Inspections and Repair Criteria Within the Tubesheet Region of the Steam Generators."

2. Letter from N. Kalyanam (NRC) to Richard M. Rosenblum (SCE) Dated March 23, 2006,

Subject:

San Onofre Nuclear Generating Station, Units 2 and 3 -

Request for Additional Information on the Proposed C* Amendment for Steam Generator Tube Inspection and Repair in the Tubesheet (TAC NOS. MC8850 and MC8851)

3. Letter from Brian Katz (SCE) to NRC (Document Control Desk) Dated May 1, 2006,

Subject:

San Onofre Nuclear Generating Station, Units 2 and 3, Docket Nos. 50-361 and 50-362, Response to Request For Additional Information and Submittal of Supplement I to Proposed Change Number NPF-10/15-565 License Amendment Request, "Proposed Technical Specification Change, Define the Extent of the Required Tube Inspections and Repair Criteria Within the Tubesheet Region of the Steam Generators."

P.O. Box 128 San Clemente, CA 92674-0128 949-368-9275 Fax 949-368-9881

Document Control Desk October 5, 2006

4. Letter from Brian Katz (SCE) to NRC (Document Control Desk) Dated August 15, 2006,

Subject:

San Onofre Nuclear Generating Station, Units 2 and 3, Docket Nos. 50-361 and 50-362, Response to Request For Additional Information and Submittal of Supplement 2 to Proposed Change Number NPF-1 0/15-565 License Amendment Request, "Proposed Technical Specification Change, Define the Extent of the Required Tube Inspections and Repair Criteria Within the Tubesheet Region of the Steam Generators."

5. Letter from N. Kalyanam (NRC) to Richard M. Rosenblum (SCE) Dated September 19, 2006,

Subject:

San Onofre Nuclear Generating Station, Units 2 and 3 - Issuance of Amendments Re: Technical Specification Improvement Regarding Steam Generator Tube Integrity Based on Technical Specification Task Force (TSTF) Standard Technical Specification Change Traveler, TSTF-449, "Steam Generator Tube Integrity" (TAC Nos. MC9236 and MC9237)

Dear Sir or Madam:

Reference 1, as modified by References 3 and 4, requested license amendments for San Onofre Units 2 and 3. Those proposed amendments revise Technical Specification (TS) Section 5.5.2.11 to modify the descriptions of steam generator tube "Repair Limit" and "Tube Inspection." The purpose of these changes is to define the extent of the required tube inspections and repair criteria within the tubesheet regions.

Reference 5 was issued by the NRC on September 19, 2006 providing San Onofre Unit 2 and 3 Amendments 204 and 196, respectively, approving SCE Technical Specification proposed change (PCN)-564 which incorporates Technical Specification Task Force (TSTF)-449, "Steam Generator Tube Integrity."

Since reference 5 introduced significant revisions to Technical Specification 5.5.2.11, "Steam Generator (SG) Program", it is now necessary to revise the PCN-565 proposed Technical Specification changed pages accordingly. This Supplement 3 submittal provides the revised pages to implement PCN-565 upon NRC approval.

The No Significant Hazards Consideration and Environmental Evaluation provided with PCN-565 both remain bounding.

Should you have any questions, or require additional information, please contact Ms. L. Pressey at (949) 368-6351.

Sincerely,

Document Control Desk October 5, 2006

Enclosures:

1. Notarized affidavit, Unit 2
2. Notarized affidavit, Unit 3
3. Supplement 3 to the Proposed License Amendment Request, Proposed Change Number NPF-10/15-565, with attached modifications to the currently approved, Technical Specification TSTF-449 Amendment, changed pages.

cc: B. S. Mallett, Regional Administrator, NRC Region IV N. Kalyanam, NRC Project Manager, San Onofre Units 2 and 3 C. C. Osterholtz, NRC Senior Resident Inspector, San Onofre Units 2: and 3 S. Y. Hsu, California Department of Health Services, Radiologic Health Branch

Enclosure 1 UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION Application of SOUTHERN CALIFORNIA )

EDISON COMPANY, ET AL. for a Class 103 ) Docket No. 50-361 License to Acquire, Possess, and Use ) Supplement 3 to a Utilization Facility as Part of ) Amendment Application Unit No. 2 of the San Onofre Nuclear ) No. 238 Generating Station )

SOUTHERN CALIFORNIA EDISON COMPANY, ET AL. pursuant to 10 CFR 50.90, hereby submit Supplement 3 to Amendment Application No. 238. This amendment application consists of Proposed Change No. NPF-10-565 which is a request to revise Facility Operating License NPF-10 to define the extent of the required steam, generator tube inspections and repair criteria within the'tubesheet regions.

State of California County of San Diego Brian Katz, Vice Preside Subscribed and sworn to f before me on this ____ day of oc-* obet- ,2006, by "*'lv\ n M'-

personally known to me Or pr"..d to me on the basis- of.satisfla-.tory evidn*,*o.- be the person who appeared before me.

h-olary Public 2

Enclosure 2 UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION Application of SOUTHERN CALIFORNIA EDISON COMPANY, ET AL. for a Class 103 ) Docket No. 50-362 License to Acquire, Possess, and Use ) Supplement 3 to a Utilization Facility as Part of ) Amendment Application Unit No. 3 of the San Onofre Nuclear ) No. 222 Generating Station )

SOUTHERN CALIFORNIA EDISON COMPANY, ET AL. pursuant to 10 CFR 50.90, hereby submit Supplement 3 to Amendment Application No. 222. This amendment application consists of Proposed Change No. NPF-15-565 which is a request to revise Facility Operating License NPF-15 to define the extent of the required steam generator tube inspections and repair criteria within the tubesheet regions.

State of California County of San Diego Brian Katz, Vice Preside Subscribed and sworn to (or affirmed) before me on this *-". day of

. 0 40 ýe ,2006, by VA~n 1 }

personally known to me er provze to me o r the badss Of" stiSfact[' vicdenc to be the person who appeared before me.

DAM A. FARRRL Com.6ft, 0 1623106 Nokmv RAft - CaNaffft Notary Public sm 0WW CCU*

WCmMeon"OV20.

its,

ENCLOSURE 3 Supplement 3 to the Proposed License Amendment Request, Proposed Change Number NPF-10/15-565, with attachments A - D (modifications to the approved Technical Specification TSTF-449 Amendment changed, pages)

LICENSEE'S EVALUATION DESCRIPTION FOR PROPOSED CHANGE NPF-10115-565 SUPPLEMENT 3 PROPOSED TECHNICAL SPECIFICATION CHANGE, DEFINE THE EXTENT OF THE REQUIRED TUBE INSPECTIONS AND REPAIR CRITERIA WITHIN THE TUBESHEET REGION OF THE STEAM GENERATORS San Onofre Nuclear Generating Station Units 2 and 3 PCN-565 SUPPLEMENT 3 PROPOSED TECHNICAL SPECIFICATION CHANGE REVISIONS (changes hand marked on approved Technical Specification pages)

Unit 2: see Attachment A Unit 3: see Attachment B PCN-565 SUPPLEMENT 3 PROPOSED TECHNICAL SPECIFICATIONS PAGES (with changes)

Unit 2: see Attachment C Unit 3: see Attachment D

1.0 INTRODUCTION

This supplement to PCN-565 provides revised proposed Technical Specification change pages that provide consistency with the approved Technical Specifications incorporating the Technical Specification Task Force (TSTF)-449 Unit 2 and 3 amendments 204 and 196, respectively, that were issued by the NRC on September 19, 2006.

2.0 PROPOSED CHANGE

A letter was issued by the NRC on September 19, 2006 issuing San Onofre Unit 2 and 3 Amendments 204 and 196, respectively, approving SCE Technical Specification proposed change (PCN)-564 which incorporates Technical Specification Task Force (TSTF)-449, "Steam Generator Tube Integrity." Since incorporation of TSTF-449 introduced significant revisions to Technical Specification 5.5.2.11, "Steam Generator (SG) Program, it is now necessary to revise the PCN-565 proposed Technical Specification changed pages accordingly.

This Supplement 3 submittal provides the revised pages to implement PCN-565 Amendments onto the currently approved San Onofre Units 2 and 3 Technical Specification pages upon NRC approval.

3.0 REGULATORY SAFETY ANALYSIS The No Significant Hazards Consideration and Environmental Evaluation provided with PCN-565 both remain bounding.

Attachment A PCN-565 SUPPLEMENT 3 PROPOSED TECHNICAL SPECIFICATION CHANGE REVISIONS (changes hand marked on approved Technical Specification pages)

SONGS Unit 2

SEP-1.9-2006 13:51 P. 18/35 P 63 Procedures, Programs, and Manuals 5.5 5.5 Procedures, Programs, and Manuals (continued) 5.5.2.11 Steam Generator (S6) Program (continued)

( c. Provisions for SG tu e repair criteria. The non-sleeved region of a tube .f lnd by inserv ie inspection .- contain \

flaws with a d *Fh equal to oa exceedin~g 44%.* the nominal S tube wall t ~ness shall ;mplugged or repaYired except if ffe flaws are lermitted to r*rai in service t1rough applica n

,. of an ternate tube air criteria d cussed bel~ow*.

/AJVeie7 A T bes salb pge f the sle ed region of .atube is oun byis ceiseton t Contai n fl aws ii the (a) sleeve, or pesr ond

  • porti'on of eMoriginal tube wall in joint)t ?l sleeve tube as ebly (i.e., t ~sleeve-to-tube ,
d. Provisions for SG tube inspections.. Periodic SG tube inspections shall be performed, The number and portions of the tubes inspected and methods of inspection shall be performed with the objective of detecting flaws of any type (e~g., volumetric flaws, axial and circumferential cracks) that may be present along the length of the tube, .from the tube-to-tubesheet weldat the tube inlet to the tube-to-tubesheet weld at the tube outlet, and that may satisfy the applicable tube repair criteria. The tube-to-tubesheet weld is not part of the tube. 1, In addition to meeting the

//V~rct7 -6 requirements of d.l, d.2, d.3,. and d.4 below, the inspect~ion scope, inspection methods, and inspection intervals shall be such as to ensure that SG tube integrity is maintained until the next SG inspection,. An assessment of degradation shall be performed to determine the type and location of flaws to which the tubes may be susceptible and, based on this assessment, to determine which inspection methods need to be employed and at what locations.

1. Inspect .100% of the tubes in each SG during the first refueling outage following SG replacement.
2. Inspect 100% of the tubes at sequential periods of 60 effective full power months. The first sequential period shall be considered to begin after the first inservice inspection of the SGs. No SG shall operate for more than 24 effective full power months or one refueling outage (whichever is less) without bding inspected.

J!

(continued)

SAN ONOFRE--UNIT 2 5.0-15 Amendment No.-48, 204

I!,

... INSERTA...

c. Provisions for SG tube repair criteria.

1.-----Tubes shall be plugged -orrepairedif the -non-sleeved-region-of-a-tube-s------

found by inservice inspection to contain flaws with a depth equal to or exceeding 44% of the nominal tube wall thickness, at a location that is not addressed in Technical Specification 5.5.2.11 .c.2.

.2. _Tubes shall be_piugg~ed r_ repaired ifthe non-sleeved region of a tube is found by inservice inspection to'contain flaWs at either ol the followring locations;.. .................. .

a. below the bottom of the hot leg expansion transition or hot leg top of the tubesheet, whichever is higher, or
b. below the bottom of the cold leg expansion transition or cold leg top of the tubesheet, whichever is higher.
3. Tubes shall be plugged ifthe sleeved region of a tube is found to contain flaws in the:
b. Sleeve or original tube wall at asleeve-to-tube joint.
4. The following C* methodology may be applied in a portion of the expanded tube in the tubesheet region, as an alternative to the repair criteria of Technical Specification 5.5.2.11 .c.2. Flaws, in the locations described below, may remain in service regardless of size.
a. For tubes that have not been repaired in the hot leg tubesheet region: Greater than 10.6 inches below the bottom of the hot leg expansion transition or top of the hot leg tubesheet, whichever is lower..
b. For tubes that have not been repaired in the cold leg tubesheet region: Greater than 11.0 inches below the bottom of the cold leg expansion transition or top of the cold leg tubesheet, whichever is lower.

. . . ... .. . . . . . . .. . ... -. .. .. N.S E .T,.A. (C o~nti~nued) .. .. . . .... . .

c, For.tubes that have been repaired in the hot leg tubesheet reqgio.n:

Below-the-bottom-of-the-lower-sleeve-to-tube-joint-or- greater-than--

10.6 inches below the bottom of the hot leg expansion transition or greater than 10.6 inches below the top of the hot leg tubesheet, whichever of these three is lowest.

d. For tubes that have been repaired in the cold leg tubesheet region:

Below thO bottom of the lower sleeve-to-tube joint or greater than,

..11,0 inches below the bottom of the cold leg expansion transition or greater than 11.0 inches below the top of the cold legtubesheet, whichever of these three is lowest.

INSERT B Intubes repaired by sleeving, the portion of the original tube wall between the sleeve's joints is not an area requiring re-inspection.

Attachment B PCN-565 SUPPLEMENT 3 PROPOSED TECHNICAL SPECIFICATION CHANGE REVISIONS (changes hand marked on approved Technical Specification pages)

SONGS Unit 3

SEP-19-2006 13:57 P. 05/15 Procedures, Programs, and Manuals 5.5 5.5 Procedures, Programs, and Manuals (continued) 5.5.2.11 Steam Generator (SG) Program (continued) I

c. Provisions for SG tube repair crý'eria. The n-sleeved region of a Xbe found by inser,ice inspec
  • n to contain flaws with,, depth equal to oexceeding P%of the nomin tube wall thickness shall b plugged or epaired except
  • the flaws a epermitted to re in in servv. e through appli tion

//t3se-i 7,A of an Iternate tube rep ir criteri discussed below Tu s shall be plugg if the sl ved region of a ube is

.f und by inservice spection contain flaws $the (a) leeve or (b) pre ure bounda portion of the original tube wall in the slee e tube ass bly (i.e., the seeve-to-tube joint).

d. Provisions for SG tube inspections. Periodic SG tube inspections shall be performed. The number and portions of the tubes inspected and methods of inspection shall be performed with the objective of detecting flaws o- any type (e.g., volumetric flaws, axial and circumferential cracks) that may be present along the length of the tube, from the tube-to-tubesheet weld at the tube inlet to the tube-to-tubesheet weld at the tube outlet, and that may satisfy the applicable tube repair criteria. The tube-to-tubesheet weld

/AL.O,?7 is not part of the tube,,d In addition to meeting the requirements of d.1, d.2, d.3, and d.4 below, the inspection scope, inspection methods, and inspection intervals shall be such as to ensure that SG tube integrity is maintained until the next SG inspection. An assessment of degradation shall be performed to determine the type and location of flaws to which the tubes may be susceptible and, based on this assessment, to determine which inspection methods need to be employed and at what locations.

1. Inspect 100% of the tubes in each SG during the' first refueling outage following SG replacement.
2. Inspect 100k of the tubes at sequential periods of 60 effective full power months. The first sequential period shall be considered to begin after the first inservice inspection of the SGs. No SG shall operate for more than 24 effective full power months or one refueling outage (whichever is less) without being inspected.

(continued)

SAN ONOFRE--UNIT 3 5.0-15 Amendrient No.15-2, 196

INSERT A.

c. Provisions for SG tube repair criteria.

-- Tubes shallbe -plugged -onrrepaired-if the non-sleeved-region-of-atube-is;-----

1-- -

found by inservice inspection to contain flaws with a depth equal to or exceeding 44% of the nominal tube wall thickness, at a location that is not addressed in Technical Specification 5.5.2.11 .c.2,

_2.-.Tubes shall be plugged or repaired ifthe non-sleeved region of a tube is found by inservice inspection to contain- fl8w0 at either ol the following locations:. . .

a. below the bottom of the hot leg expansion transition or hot leg top of the tubesheet, whichever is higher, or
b. below the bottom of the cold leg expansion transition or cold leg top of the tubesheet, whichever is higher.
3. Tubes shall be plugged if the sleeved region of a tube is found to contain flaws in the:
a. Sleeve, or
b. Sleeve or original tube wall at a sleeve-to-tube joint.
4. The following C* methodology may be applied in a portion of the expanded tube in the tubesheet region, as an alternative to the repair criteria of Technical Specification 5.5.2.11 .c.2. Flaws, in the locations described below, may remain in service regardless of size.
a. For tubes that have not been repaired in the hot leg tubesheet region: Greater than 10.6 inches below the bottom of the hot leg expansion transition or top of the hot leg tubesheet, whichever is lower.
b. For tubes that have not been repaired in the coId leg tubesheet region: Greater than 11.0 inches below the bottom of the cold leg expansion transition or top of the cold leg tubesheet, whichever is lower.

.. .. .. .. . INS ERT..A (Continued) . ......

o, ..For.tubes that have been repaired in.the hot leg tubesheet reqgion:

Below the-bottom-of-the -lower-sleeve-to-tube-joint-or-greate r-than-- --

10.6 inches below the bottom of the hot leg expansion transition or greater than 10.6 inches below the top of the hot leg tubesheet, whichever of these three is lowest.

d. For tubes-that hayvebeen. repaired in the cold leg tubesheet region:

Below the bottom Of the lower sleeve-to-tube joint or greatetr than

.11,0 inches below the bottom of the cold leg expansion transition or greater than 11.0 inches below the top of the cold iegtubesheet, whichever of these three is lowest.

INSERT B In tubes repaired by sleeving, the portion of the original tube wall between the sleeve's joints is not an area requiring re-inspection.

Attachment C PCN-565 SUPPLEMENT 3 PROPOSED TECHNICAL SPECIFICATION %S PAGES (with changes)

SONGS Unit 2 v

Procedures, Programs, and Manuals 5.5 5.5 Procedures, Programs, and Manuals (continued) 5.5.2.11 Steam Generator (SG) Program (continued)

c. Provisions for SG tube repair criteria.
1. Tubes shall be plugged or repaired if the non-sleeved region of a tube is found by inservice inspection to contain flaws with a depth equal to or exceeding 44% of the nominal tube wall thickness, at a location that is not addressed in Technical Specification 5.5.2.11.c.2.
2. Tubes shall be plugged or repaired if the non-sleeved region of a tube is found by inservice inspection to contain flaws at either of the following locations:

a) below the bottom of the hot leg expansion transition or hot leg top of the tubesheet, whichever is higher, or b) below the bottom of the cold leg expansion transition or cold leg top of the tubesheet, whichever is higher.

3. Tubes shall be plugged if the sleeved region of a tube is found to contain flaws in the:

a) sleeve, or b) sleeve or original tube wall at a sleeve-to-tube joint.

4. The following C* methodology may be applied in a portion of the expanded tube in the tubesheet region, as an alternative to the repair criteria of Technical Specification 5.5.2.11.c.2. Flaws, in the- locations described below, may remain in service regardless of size.

a) For tubes that have not been repaired in the hot leg tubesheet region: Greater than :10.6 inches below the bottom of the hot leg expansion transition or top of the hot leg tubesheet, whichever is lower.

b) For tubes that have not been repaired in the cold leg tubesheet region: Greater than 11.0 inches below the bottom of the cold leg expansion transition or top of the cold leg tubesheet, whichever is lower.

(continued)

SAN ONOFRE--UNIT 2 5.0-15 Amendment No.

Procedures, Programs, and Manuals 5.5 5.5 Procedures, Programs, and Manuals (continued) 5.5.2.11 Steam Generator (SG) Program (continued) c) For tubes that have been repaired in the hot leg tubesheet region: Below the bottom of the lower sleeve-to-tube joint or greater than 10.6 inches below the bottom of the hot leg expansion transition or greater than 10.6 inches below the top of the hot leg tubesheet, whichever of these three is lowest.

d) For tubes that have been repaired in the cold leg tubesheet region: Below the bottom of the lower sleeve-to-tube joint or greater than 11.0 inches below the bottom of the cold leg expansion transition or greater than 11.0 inches below the top of the cold leg tubesheet, whichever of these three is lowest.

d. Provisions for SG tube inspections. Periodic SG tube inspections shall be performed. The number and portions of the tubes inspected and methods of inspection shall be performed with the objective of detecting flaws of any type (e.g., volumetric flaws, axial and circumferential cracks) that may be present along the length of the tube, from the tube-to-tubesheet weld at the tube inlet to the tube-to-tubesheet weld at the tube outlet, and that may satisfy the applicable tube repair criteria. The tube-to-tubesheet weld is not part of the tube. In tubes repaired by sleeving, the portion of the original tube wall between the sleeve's joints is not an area requiring re-inspection. In addition to meeting the requirements of d.1, d.2, d.3, and d.4 below, the inspection scope, inspection methods, and inspection intervals shall be such as to ensure that SG tube integrity is maintained until the next SG inspection. An assessment of degradation shall be performed to determine the type and location of flaws to which the tubes may be susceptible and, based on this assessment, to determine which inspection methods need to be employed and at what locations.
1. Inspect 100% of the tubes in each SG during the first refueling outage following SG replacement.
2. Inspect 100% of the tubes at sequential periods of 60 effective full power months. The first sequential period shall be considered to begin after the first inservice inspection of the SGs. No SG shall operate for more than 24 effective full power months or one refueling outage (whichever is less) without being inspected.

(continued)

SAN ONOFRE--UNIT 2 5.0-15a Amendment No.

Attachment D PCN-565 SUPPLEMENT 3 PROPOSED TECHNICAL SPECIFICATIONS PAGES (with changes)

SONGS Unit 3

Procedures, Programs, and Manuals 5.5 5.5 Procedures, Programs, and Manuals (continued) 5.5.2.11 Steam Generator (SG) Program (continued)

c. Provisions for SG tube repair criteria.
1. Tubes shall be plugged or repaired if the non-sleeved region of a tube is found by inservice inspection to contain flaws with a depth equal to or exceeding 44% of the nominal tube wall thickness, at a location that is not addressed in Technical Specification 5.5.2.11.c.2.
2. Tubes shall be plugged or repaired if the non-sleeved region of a tube is found by inservice inspection to contain flaws at either of the following locations:

a) below the bottom of the hot leg expansion transition or hot leg top of the tubesheet, whichever is higher, or b) below the bottom of the cold leg expansion transition or cold leg top of the tubesheet, whichever is higher.

3. Tubes shall be plugged if the sleeved region of a tube is found to contain flaws in the:

a) sleeve, or b) sleeve or original tube wall at a sleeve-to-tube joint.

4. The following C* methodology may be applied in a portion of the expanded tube in the tubesheet region, as an alternative to the repair criteria of Technical Specification 5.5.2.11.c.2. Flaws, in the locations described below, may remain in service regardless of size.

a) For tubes that have not been repaired in the hot leg tubesheet region: Greater than 10.6 inches below the bottom of the hot leg expansion transition or top of the hot leg tubesheet, whichever is lower.

b) For tubes that have not been repaired in the cold leg tubesheet region: Greater than :11.0 inches below the bottom of the cold leg expansion transition or top of the cold leg tubesheet, whichever is lower.

(continued)

SAN ONOFRE--UNIT 3 5.0-15 Amendment No.

Procedures, Programs, and Manuals 5.5 5.5 Procedures, Programs, and Manuals (continued) 5.5.2.11 Steam Generator (SG) Program (continued) c) For tubes that have been repaired in the hot leg tubesheet region: Below the bottom of the lower sleeve-to-tube joint or greater than 10.6 inches below the bottom of the hot leg expansion transition or greater than 10.6 inches below the top of the hot leg tubesheet, whichever of these three is lowest.

d) For tubes that have been repaired in the cold leg tubesheet region: Below the bottom of the lower sleeve-to-tube joint or greater than 11.0 inches below the bottom of the cold leg expansion transition or greater than 11.0 inches below the top of the cold leg tubesheet, whichever of these three is lowest.

d. Provisions for SG tube inspections. Periodic SG tube inspections shall be performed. The number and portions of the tubes inspected and methods of inspection shall be performed with the objective of detecting flaws of any type (e.g., volumetric flaws, axial and circumferential cracks) that may be present along the length of the tube, from the tube-to-tubesheet weld at the tube inlet to the tube-to-tubesheet weld at the tube outlet, and that may satisfy the applicable tube repair criteria. The tube-to-tubesheet weld is not part of the tube. In tubes repaired by sleeving, the portion of the original tube wall between the sleeve's joints is not an area requiring re-inspection. In addition to meeting the requirements of d.1, d.2, d.3, and d.4 below, the inspection scope, inspection methods, and inspection intervals shall be such as to ensure that SG tube integrity is maintained until the next SG inspection. An assessment of degradation shall be performed to determine the type and location of flaws to which the tubes may be susceptible and, based on this assessment, to determine which inspection methods need to be employed and at what locations.
1. Inspect 100% of the tubes in each SG during the first refueling outage following SG replacement.
2. Inspect 100% of the tubes at sequential periods of 60 effective full power months. The first sequential period shall be considered to begin after the first inservice inspection of the SGs. No SG shall operate for more than 24 effective full power months or one refueling outage (whichever is less) without being inspected.

(continued)

SAN ONOFRE--UNIT 3 5.0-15a Amendment No. I

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