DCL-19-054, Submittal of Acceptance Report Following the Installation of Structural Weld Overlay, REP-RHR-SWOL for Unit 1

Submittal of Acceptance Report Following the Installation of Structural Weld Overlay, REP-RHR-SWOL for Unit 1

ML19182A361
Person / Time
Site:	Diablo Canyon
Issue date:	07/01/2019
From:	Gerfen P Pacific Gas & Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
DCL-19-054
Download: ML19182A361 (15)

Text

{{#Wiki_filter:Pacific Gas and Electric Company" Paula Gerten Diablo Canyon Power Plant Site Vice President Mail code 104/5/502 P.O. Box 56 Avila Beach, CA 93424 805.545.4596 Internal: 691.4596 Fax: 805.545.4234 July 1, 2019 PG&E Letter DCL-19-054 U.S. Nuclear Regulatory Commission 10 CFR 50.55a ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-275, OL-DPR-80 Diablo Canyon Unit 1 , Submittal of Acceptance Report Following the Installation of Structural Weld Overlay, REP-RHR-SWOL for Unit 1

References:

1. PG&E Letter DCL-17-083, "Request for Approval of Alternative for Application of Full Structural Weld Overlay, REP-RHR-SWOL, Units 1 and 2," dated September 26, 2017

[ML17269A220]

2. NRC Letter, "Diablo Canyon Power Plant, Units 1 and 2 - Relief Request REP-RHR-SWOL, Request for Approval of Alternative for Application of Full Structural Weld Overlay (EPID L-2017-LLR-0092)," dated January 2, 2018 [ML17338A131]

3. PG&E Letter DCL-18-050, "Evaluation Documents in Support of Structural Weld Overlay, REP-RHR-SWOL, Unit 2," dated September 11, 2018 [ML18254A426]

Dear Commissioners and Staff:

In Reference 1, Pacific Gas and Electric Company (PG&E) submitted a relief request for the Diablo Canyon Power Plant (DCPP) Units 1 and 2. The relief request consisted of the installation of a full structural weld overlay (SWOL) at weld joint WIB-228 in Unit 1 and at weld joint WIB-245 in Unit 2 (referred to as the Unit 1 SWOL and the Unit 2 SWOL in subsequent paragraphs). In Reference 2, the NRC Staff approved the relief request. PG&E installed the Unit 2 SWOL during the Unit 2 twentieth refueling outage. In Reference 3, PG&E submitted the evaluation documents in support of the Unit 2 SWOL. PG&E installed the Unit 1 SWOL during the Unit 1 twenty-first A member of the STARS Alliance Callaway

• Diablo Canyon
• Palo Verde
• Wolf Creek

Document Control Desk PG&E Letter DCL-19-054 July 1, 2019 Page 2 refueling outage. Accordingly, PG&E is submitting the following documents associated with installation of the Unit 1 SWOL:

• Enclosure 1 provides the acceptance of the Unit 1 SWOL, which summarizes the axial shrinkage measurements and confirmation of acceptable UT inspection results.
• Enclosure 2 provides as-built dimensions of the Unit 1 SWOL. All thickness dimensions of the weld overlay were within tolerance limits. The length of the overlay exceeded the length listed on the design drawing.

An engineering evaluation was completed, and the longer overlay was determined to be acceptable. The details are documented in Enclosure 2. The design report for the SWOL installations and the evaluation report associated with the addition of a second stainless steel buffer layer to the original design for the SWOL installations were previously submitted in Reference 3. Those two reports are applicable to both Unit 1 SWOL and Unit 2 SWOL installations. PG&E makes no new or revised regulatory commitments (as defined by NEI 99-

04) in this letter. If you have any questions or require additional information, please contact Mr. Hossein Hamzehee, Regulatory Services Manager, at (805) 545-4720. ,

SinP-l~c;' ~ Paula Gerten Site Vice President

                    ~

rntt/4231/50965613-10 Enclosures cc: Diablo Distribution cc/enc: Scott A. Morris, NRC Region IV Administrator Christopher W. Newport, NRC Senior Resident Inspector Gonzalo L. Perez, Branch Chief, California Department of Public Health Balwant K. Singal, NRC Senior Project Manager State of California, Pressure Vessel Unit A member of the STARS Alliance Callaway

• Diablo Canyon
• Palo Verde
• Wolf Creek

Enclosure 1 PG&E Letter DCL-19-054 Diablo Canyon Power Plant, Unit 1 Acceptance of Weld Overlay - RHR Weldment WIB-228-Unit 1

Structural Integrity Associates, Inc. 5215 Hellyer Ave nue, Suite 210, San Jose, CA 95138 I 408-978-8200 jaxline@structint.com March 7, 2019 Report No. 1900262.401.R0 Quality Program: ~ Nuclear D Commercial Mr. Rob O'Sullivan Design Engineering Manager-Interim Pacific Gas & Electric Company Diablo Canyon Power Plant 9 Miles NW of Avila Beach P.O. Box 56 Avila Beach, CA 93424-0056

Subject:

Acceptance of Weld Overlay - RHR Weldment WIB-228-Unit 1

References:

1. AZZ Weld Overlay Construction Drawing, No. 434323, Rev. 0, Populated, Transmitted by DIT 50915871-015-00, SI File No. 1900262.207.

2. Final UT Report, WIB-228OL, dated 3/3-4/19, Transmitted by DIT 50915871-016-00, SI File No. 1900262.208.

3. Post-Weld Overlay Walkdown Documentation, Email: J. Fonturbel (PG&E) to J. Axline (SI), Ul RHR SWOL Engineering Walkdown 60109329-0300, 3/2/2019, 1:15 PM, SI File No. 1900262.203.

4. Unit 1 Work Order 60109333, RR 1-2RR- Meas/Rem/Inst Bumpers & Bolts, Transmitted by DIT 50915871-017-00, SI File No. 1900262.210.

5. DCPP Relief Request, REP-RHR-SWOL, dated September 26, 2017.

6. SI Report 1700479.401, Rev. 0, Design Report for the Qualification of the Structural Weld Overlay Repair of Residual Heat Removal Welds WIB-245 and WIB-228, Diablo Canyon Power Plant, Unit 1 and 2.

7. SI Report 1700479.402, Rev. 1, Impact of Added Second Buffer Layer of Stainless Steel to RHR Weld Overlay.

8. Final approved AZZ NCR 19-187, RHR WIB-228(OL), SI File No. 1900262.206.

Dear Mr. O'Sullivan,

SI has reviewed the referenced AZZ as-built construction drawing [1] against the design dimensions of the SI Design Report, 1700479.401 [6], and all as-measured dimensions are within the maximum and minimum values used in the design, except for those noted and dispositioned in NCR 19-187 [8]. The conclusion of the NCR 19-187 disposition was that the nonconformance did not adversely impact the conclusions of the Design Report, and therefore the Use-As-Is disposition is acceptable. The maximum measured axial shrinkage of the completed weld overlay (0.0268" average value, 0.048"maximum azimuthal value) is less than the assumed shrinkage (0.25 inch) in the design qualification [6] , thus the value of axial shrinkage is acceptable. minfo@STRUCTINT.com \.1 -877-451-POWER @l www.STRUCTINT.com

Mr. Rob O'Sullivan Structural Integrity Associates, Inc. March 7, 2019 Report No. 1900262.401.RO The referenced UT report [2] confirms that the final weld overlay meets the acceptance requirements of the Relief Request, REP-RHR-SWOL [5], for Units 1 and 2. The referenced post-weld overlay walkdown information [3 & 4] has confirmed that the affected piping components (supports, gaps, etc.) are acceptable. Based on the review of the documents above, the conclusions and results of the Design Report, 1700479.401 [6], and the Reconciliation Report 1700479.402 [7], are justified, including future operation as noted in the reports. The weld overlay meets all applicable requirements of the ASME Code and the Relief Request. Prepared by: Verified by: 3/7/2019 3/7/2019 ( 1,ies_W. Axline'. P.E. Date David Segletes Date

'-Associate                                            Senior Consultant Approved by:
  ~

Chris S. Lohse, P .E. 3/7/2019 Date Associate cc: N. Gerber (SI) PAGE I2 minfo@STRUCTINT.com ~ 1-877-4S1-POWER 1$ www. STRUCT/NT. com

Enclosure 2 PG&E Letter DCL-19-054 Diablo Canyon Power Plant, Unit 1 Transmittal of NCR-19-187 Disposition - SI Engineering SWOL for RHR Weldment WIB-228-Unit 1

@Structural Integrity Associates, Inc. 5215 He llyer Ave nue, Suite 210, San Jose, CA 95138 I 408-978-8200 jaxline@structint.com March 4, 2019 Report No. 1900262.402.R0 Quality Program: ~ Nuclear D Commercial Mr. Rob O'Sullivan Design Engineering Manager-Interim Pacific Gas & Electric Company Diablo Canyon Power Plant 9 Miles NW of Avila Beach P.O. Box 56 Avila Beach, CA 93424-0056

Subject:

Transmittal ofNCR-19-187 Disposition - SI Engineering SWOL for RHR Weldment WIB-228-Unit 1

References:

1. DCPP Relief Request, REP-RHR-SWOL, dated September 26, 2017.

2. SI Report 1700479.401, Rev. 0, Design Report for the Qualification of the Structural Weld Overlay Repair of Residual Heat Removal Welds WIB-245 and WIB-228, Diablo Canyon Power Plant, Unit 1 and 2.

3. SI Report 17004 79 .402, Rev. 1, Impact of Added Second Buffer Layer of Stainless Steel to RHR Weld Overlay.

4. AZZ SWOL As-Builts, AZZ Drawing 434323, Rev. 0, Populated, PG&E DIT 50915871-015-00, SI File No. 1900262.201.

5. PG&E DCPP RHR SWOL NDE (UT) Report, Weld WIB-228OL, PG&E DIT 50915871-016-00, SI File No. 1900262.201.

6. PG&E DCPP PO, 3501191286, Rev. 0

7. AZZ NCR-19-187, RHR WIB-228 (OL), Project 262523, SI File No.

1900262.201.

Dear Mr. O'Sullivan,

This letter formally documents the SI engineering support for a Use-As-Is disposition for AZZ NCR-19-187. The SI engineering discussion and justification is contained as an attachment to this letter. The justification includes attachments of the AZZ NCR [7] and the AZZ populated Construction drawing [4], which were used as a basis for the justification. Based on the SI review and documentation, the Use-As-Is justification is supported. minfo@STRUCTINT.com \.1-877-4S1-POWER 1$ www.STRUCTINT.com

Mr. Rob O'Sullivan Structural Integrity Associates, Inc. March 4, 2019 Report No. 1900262.402.R0 DCPP personnel (J. Fonturbel, and/or his replacement) are authorized to sign for SI on the AZZ NCR under Technical Justification. Prepared by: Verified by: ( J es_W. Axline, P.E. 3/4/2019 Date

                                                        £~

Chris Lohse, P.E. 3/4/2019 Date soc1ate Associate Approved by: 3/4/2019 Dave Segletes Date Senior Consultant ATTACHMENT: SI Justification and Discussion NCR-19-187 (6 pages) cc: N. Gerber (SI) PAGE I2 minfo@STRUCTINT.com \.1-877-4S1-POWER G www.STRUCTINT.com

NCR 19-187, Attachment 1, Revision 1 SWOL for WIB-228 RHR Weldment - Disposition for SWOL Length onto Elbow During final measurements of the weld overlay over the Unit 1 WIB-228 RHR Weldment, following contouring, the length of the SWOL onto the elbow exceeds that of the design drawing (SI Drawing 1600546.510). Specifically, the length of the SWOL onto the elbow at the intrados is listed on the SI Drawing as 4.52" max., while the maximum measured dimension of 4.840", exceeds that by 0.32". In addition, the extension of the SWOL to the break at the extrados is listed on the SI Drawing as 2.98" max., while the maximum measured dimension of 3.399", exceeds that by 0.419" (This is listed in the AZZ NCR as 0.420". This Disposition will refer to 0.419"). The end result of these nonconformances is that there is "extra" SWOL length onto the elbow. All thickness dimensions at all Stations are within tolerance. The disposition for this NCR is Use-As-ls. The nonconformance of a longer overlay onto the elbow is acceptable for the following reasons: Structural Capacity and Mechanical Stress: The current design structural analyses for the overlay used minimum thicknesses of the overlay at the three axial Stations A, 8, and C. All measured thicknesses at all three Stations, at all azimuths, meet the minimum dimensions. The minimum structural thickness defined in the sizing calculation, 1600546.310, is met for all sections over the pipe and elbow, and there are no nonconformances of overlay length less than minimum. Thus, the capacity of the overlay to sustain mechanical loads is not adversely impacted by this nonconformance. Residual Stress: Relative to the increased length of the SWOL onto the elbow, the design analyses used a bounding method to qualify the overlay design. The minimum full structural weld overlay dimensions were conservatively used for the residual stress analysis as the smaller overlay length and thickness yields less compressive residual stresses (than the use of the maximum overlay dimensions). There is no adverse impact on the residual stress results as the thickness at all Stations exceeds the design minimum, and the added SWOL length onto the elbow will be beneficial for compressive axial residual stresses. Thermal Stress: There is no adverse impact on the thermal stress results as the thickness at all Stations, at all azimuths, is less than the design maximum. The added length of the SWOL onto the elbow will not have an adverse impact on the thermal stress results as the configuration of the elbow end of the SWOL is unchanged, a taper into the intrados, and the tapered break into the extrados. The extra length of the SWOL onto the elbow of 0.32" (lntrados) and 0.419" (Extrados) is less than a 5% change to the approximately 1O" long SWOL, and therefore the thermal stress gradient results will not be adversely impacted. NCR 19-187 WIB-228 RHR SWOL Extra Length Revision 1 Rev O Accepted.doc Page 1 of 3

NCR 19-187, Attachment 1, Revision 1 SWOL for WIB-228 RHR Weldment - Disposition for SWOL Length onto Elbow ASME Code, Section Ill: There is no adverse impact on the ASME Code, Section Ill evaluation results as the SWOL thickness at all Stations, at all azimuths, are within the design maximums and minimums, and therefore the calculated thermal/mechanical stresses are unchanged. The added length of the SWOL onto the elbow will not have an adverse impact on the ASME Code, Section Ill evaluation results as the configuration of the elbow end of the SWOL is unchanged , a taper into the intrados, and the tapered break into the extrados. The angle of the SWOL transition into the elbow at the intrados and extrados meets the intersection angle design requirements. Crack Growth: In the crack growth evaluation the residual stresses due to the minimum overlay configuration were used in the evaluation. With the length of the SWOL onto the elbow increasing, more compression will be introduced into the base material , which is beneficial for crack growth rates. The addition of beneficial compressive stresses will ensure there is no adverse impact on crack growth durations. Licensing: Relative to licensing, the element of the design that must be addressed is increased length of the SWOL onto the elbow. This is acceptable as both the Relief Request, which references Code Case N-740-2, and the associated USNRC Safety Evaluation Report (SER) have no length requirements other than the minimum shear length from the weldment toe must be met (Accepted) and that the crack growth evaluation be performed using a weldment specific residual stress profile. The previously calculated residual stress profile conservatively utilized the minimum design thicknesses, and the increased SWOL length present as a result of the nonconformance, will result in even more beneficial residual stress. The Code Case N-740-2 requirement that there be no rejectable indications within the final deposited SWOL was met, as the final UT examination documents the SWOL as SAT. NOE: The final UT examination was performed successfully with no restrictions or limitations on coverage. Thus, no adverse NOE impact is anticipated. Shear Length: The purpose of shear length is to provide sufficient area for the necessary loads to be transferred into the overlay, and back out of the overlay, without exceeding stress allowables. The nonconforming item does not reduce the shear length on either side of the overlay. Thus, there is no adverse impact on shear length requirements. Welding Time: N/A NCR 19-187 W IB-228 RHR SWOL Extra Length Revision 1 Rev O Accepted .doc Page 2 of 3

NCR 19-187, Attachment 1, Revision 1 SWOL for WIB-228 RHR Weldment - Disposition for SWOL Length onto Elbow Shrinkage and Weight: The measured axial shrinkage (0.0268" average value, 0.048" maximum azimuthal value) is significantly less than that evaluated in the qualification analysis, thus there is no adverse impact. Relative to the impact of the NCR on the SWOL weight, the evaluated configuration utilized maximum dimensions for thickness and length. In this case, the maximum added SWOL length onto the elbow of 0.32" (lntrados) and 0.419" (Extrados). However, the length of the SWOL onto the pipe is less than the maximum design dimension by a value greater than 0.50", and the measured thicknesses at Stations A, 8, and C are less than the maximum design thickness. Therefore, the analyzed configuration for impact of added SWOL weight remains bounding. Based on the discussion above, the Use-As-ls disposition for the identified nonconformance is acceptable. The final dimensions will be reconciled in the final design report. NCR 19-187 WIB-228 RHR SWOL Extra Length Revision 1 Rev O Accepted.doc Page 3 of 3

(@AZZ NONCONFORMANCEREPORT Page 1 of _ _ __ Project No: I 262523 I Project Name: I Diablo Canyon Unit 1 I NCR No: 19-187 Date Found: I 3/3/19 I Date Initiated: 3/3/19 j Initiated By: j M. Sciacca I Qty: 1 Dwg I Spec I Document No Rev PO / Contract No RIR No Action Assigned SI 1600546.510 2 3501177275 NIA Mark Sciacca 434323 0 Traveler No/Rev: Para S/N, Lot, Heat, Weld ID # of Tags ASME

                                                                                                                 ~Yes 262523-TR-002 I 0                           9.4      WIB-228(OL)                  Applied 1          Code Item:      No Component Desc: RHR WIB-228 (OL)

Document/Requirement Violated (State explicitly the specific requirement; noting the paragraph/section/location, etc) During verification of final "as built" dimensions in Traveler 262523-TR-002, Rev O Section 9.4, it has been determined the certain measurement locations on AZZ Drawing # 434323 Rev O have been violated. NonConformin Condition (Clearly state each deficienc related to the above nonconforming conditions The dimension at H - P Location at the 180 0egree azimuth, (Table 3) is .420" longer than maximum allowable by AZZ Drawing # 434323 Rev O (See Attached). The dimensions at the H - Q locations at all azimuths (Table 3) is longer than required by AZZ Drawing# 434323 Rev. 0 (See Attached). These measurements range from O degrees - 4.625", 90 degree - 4.840, 180 degrees -4.596" nd 2 O degr s - 4.644". However, the maximum allowable tolerance is 4.52". a t e : ~ Approved By: ~ ~~-.,.. Date: J-3-lfj' (QA/QC On y Disposition: ~ Use As Is D Repair D Other D Reject ( Return to Supplier D Scrap) Technical Justification (Required for any Use As Is and Repair disposition) Submitted By/Date: _ _ _ _ _ _ _ _ _ __ PM Approval/Date: Eng Approval/Date: _ _ _ _ _ _ _ _ _ __ Client Approval/Date: QA Approval/Date: _ _ _ _ _ _ _ _ _ _ __ AIA Accept/Date: QA/QC only below this line 10 CFR 21 Applicable Yes O No O By: _ _ _ _ _ _ _ _ Date: _ _ __ CAR Required Yes O No O By: _ _ _ _ _ _ _ Date: _ _ _ _ CAR#: _ _ _ __ Number of Tags Removed Closure Verification By: _ _ _ _ _ _ _ _ _ Date: _ _ _ __ Revision 06/01/2017

17 16 15 14 13 12 11 10 8 - - REVISIONS I I REVISED BY I RELEASED K REV I DESCRIPTION I SIGNATURE I . DATE I SIGNATURE I DATE SEE FILE HISTORY FOR EARLIER REVISION INFORMATION

                                                                                                                                                                                - I-                                                              I             -            I              I                          I
                                                                                                                                                                                - I-                                                              I                          I              I                          I 0    !INITIAL RELEASE                                             I       J SCULLEY          I011os12019I {.' *l.1,   fc/..f!,,, ......1  01-  r* - Z..or 9         J TABLE 1 - PRE OVERLAY AND IN-PROCESS DATA L- Pipe                H-Elbow                      S-EOW T-EOW            U- B Punch K,,.,;;,,-               Elbow to B     Mor'.<                                                                                                                                         B:,ulfor             coutJer             Cbuffer Punch M ork      Ref Punch G-Widl h Ref Punch                                                                     A1nmo1       Bir,illol    8inllloJ     Cln!lloJ             c,,11101          Abutfer                   Bbuffer Locations         Mork to       of Weld   Mork to Between Ref Pi~c'n~hA              Punch   lo C Punch        Diameter     Diameter       Depth       Diameter             Depth           Diameter                 Diameter                    Depth              Diameter               Depth Weld                    Weld     Punch     Marks    Mark         Mark        Mark                                                                                     @ Length L                @ Length H              @   Length H @Length H - U @ Length H-U M&TE                 3            3         3              \             3           3           3                 5            s          Z,6               5              '2., 6             5                          5                    ~.'-'                    5                 d-,"

PERFORMED BY f,Jl..,J" tJ'-::T A)l-";J" N'-Y ;v1.::r NL-:T }Ji..:r NL-:J JJL.'J" NL.:r Nt..:r Jvl.,T NLJ NL:J N'-3 f\Jl-J /\)L'J" J>cG- 7>~G- :J:JEG- J)P-G b>e--G ~ ~ ~ ~ -0\ ~ ;j)J:&- :J) £Gr 2)£"G- 2)&6-- ])G(r VERIFIED BY (AZZ QC) o* Lf .i I).

J)GG, 1.E,\O 5.L/35 11.,b~  ?,.'3;)). <{.~,- -;).;)53 /1(.oo'i N/A d , 3ot. N/A 1.,3~,. l'1,l.f$\ N/A ~.o\9 N/A \.!,$7 90" "l.i\O 1-~i> 5.S3o lf,'il8 3.7&S t{.Sf3 'J.~%~ l'l.o~& /3."185" N/A I I.{. o~o N/A IY.'-14° l'-\,3,8 N/A I'<. tf '{3 N/A H 180' 'VBS l.634 5.S~C:, JI. 977 1 3. %d8 'f.So8 ~- d <,J /Y, oo'f N/A d. "lf>I N/A "d-. 6 d' 11.\.'-I S'I NIA ~- d-?>, N/A 'd-.~SY 270' 'f.Y>?>'i 1.,11 5. 1W1 flY)I 3,?CfS 'i. S-11 ~.J6S /1-i.o~B t3."i'6S N/A  ! t'i . o.}O N/A \"i.'i"IO [t{.n5 N/A fl{ ."l*B N/A

                                                                                                                                          !C L-Jf:: I G

o* :: "T"'t>C G 90' 1.02 180' Looking along the ~ of the pipe toward !he elbow. Noie degree locations. Describe o* location. TABLE 4 - M & TE LINE DESCRIPTIO N ID # 14>~-M)S~ D

                                                                 -----------------------,,<------                                                                                                                                                                                                ~'!-1?~1 w.s.1-0.,_q D
                                                                 -----------------------,,<-----                                                                                                                                                                                                 w~:z-o.11'1 w.i.z:_,.,._.,
                                                                                                                                                                                                                                                                                               \   l:>M-01.11 C

C DESIGN DRAWING! I 600546.510 COMPONENT ID I WIB-228 S~OH:>R!!0 !-1 0;:'J~SUITT: t~:, S\JWA~ =E. :=;;,. :?002-! I:-,*~ --M . . f: I' I \2.\.\\

                                                                                                                                                                                                                                                               ... . . !DRAWING N/A CONSTRUCTION WELD OVERLAY,14" PIPE TO ELB0'0/,RHR,
                                                                                                                                                                                                                 -*- ')\J \              *-         -                  i,. DIABLO CANYON UNIT 1

u. , -- . ,

1

                                                                                                                                                                                                                          .-. ~?~<?~~:l:A~~f_1.:~~~l::"!IOJ.:. u "b ,,..,.~                434323                                  \"b A                                                                                                                                                                                                                     '!1~~-:=:~.~47.ii1~.=I~s;..~*;P.~~.T~t***:*?°'       '"*' )~2 I      DONOTSCALEDRAWING                     !'"'" 1 OF 2      J,:..

17 16 15 14 13 12 11 10 8 7 6 3 2

TABLE 2- POST OVERLAY DATA Angle @ EOW-P Angle @ EOW-E Punch Mark K fro ? - Between M - Pipe Ref Punch R - Pipe Ref Punch P-Elbow Ref Q-ElbowRef Mork to End of Punch Mork to Punch Mark Ar.no! Diameter ~ Blinal Diameter ~ Br,na1 Depth Cnnal Diameter ~ C r.not Depih ~ 135" FOR . ~ 135" FOR Localions Ref Punch Mar'l(S Weld Mark to Break Break to Toe of Weld @ Length L @Length H @ Length H @ Length H-U @ Length H-U LAST .38" LAST .38

5cc,.\e. 3 3 5 5 5 M&TE PERFORMED BY I NL:r N1.,:T Nc...:r NL:r 5c.c\L N LJ' NL'J l\.l L-:S " Nt.T NL.,- NLT fD T~"'"'"~ NLT T~ph\12-- l\lt..'J° VERIFIED BY !AZZ QC) o* 11.73::$ o.,'I \.',L\0

                                                                                                            ,.,so
                                                                                                            µIA                 0-KI                   IS.'i.n                          NIA             \,33,D                      NIA                   !.;;)S5              <;~,                      5A-r 90"                      11.'6?0                   (!).'l3                ).'")"!\                                 o.c.c:i                15.?'l'l                   15.7,.s                 NIA          I      IS.'") b")                    NIA               sA-r                      <;AT 180"                      l\.~'t,                   O.'B                    ,.i&<a             d.l:>7               o.'i3                   (S.'i'd?                       NIA              J.y53                      NIA                   !.1(3C               5A,                        SA-1 270'                      ~                         o.c1~        I          1-i~ I             ,.i'<3               0-'&~                     IS.?'iC\                 \$'.-,1,5              N/A          I       [$.?b,                       NIA               >A,                       SAT
                                                                             -*[tr*----;
                                     "      - -    .:,.       )                                      ~firol ll :s-i;;,. M 3), i,
                                                                                            *r::hl, F~:~_,., r:1"'"*
                                                                           -   M            .-M,- -                   ~-Q             a-
 -                                                                                                 1 l
                                                                                      .- , - ~ ,                                                                                                                                                                                                                                                               H
                                             - ~ - -, __ L ____                             +                                                                                                                                     I TABLE 5- WELD OVERLAY THICKNESS@ STATIONS BAND C IDOES NOT INCLUDE BUFFER LAYER!
                                                                                                                                                                                                                                                              - *- *. B-STATION                         -- *-* .. C STATION I

G

                                                 --------------+--                                                                                                                                                                    AZIMUTH      MIN WOL        I MAX WOL THICKNESS THICKNESS TH ICKNESS MIN WOL        I MAX WOL THICKNESS G
                                                                                                        --r--r-----                                                                                                                  INTRADOS SIDEHILL EXTRADOS
                                                                                                                                                                                                                                                         .61
                                                                                                                                                                                                                                                         .63
                                                                                                                                                                                                                                                         .64 I      .86
                                                                                                                                                                                                                                                                         .88
                                                                                                                                                                                                                                                                         .89
                                                                                                                                                                                                                                                                                          .29
                                                                                                                                                                                                                                                                                          .63
                                                                                                                                                                                                                                                                                          .79
                                                                                                                                                                                                                                                                                                           .54
                                                                                                                                                                                                                                                                                                           .88 1.04 1            I
                                                                                                             ...,....,-77, l~S'MIN FO~L>.5i .::5"'

TABLE 3 - FINAL CALCULATIONS E WOLLength ~ Punch Mork Locations Shrinkage EOW On Pipe WOLLength (K:,-~:oi - K,no.J 3.44 :5: IL- M) S 4.69 W~l-~J~ f[:i~ EOW on Elbow

                                                                                            ~~.rte Weld io Break on Elbow 3.86 S IH - Q) S 4.52 Thickness Over Buffer @ A Thickness Over Buffer@ B Thickness Over Buffer @ B
                                                                                                                                                                  !Ar.nal- Ata!ic-) I 2 ~       !B,,., , - B,,,,,.,) 12      ~ 80 , , , , Depth - B,_, 01 Depth    0 Thickness Over Buffer @ C Thickness Over Buffer@ C (Cn,cl - ct:u11e:l 12      ~ cb,r.or Depth - c,..,,Depth~

(.63 SA :5: .B8) SEE TABLE 5 SEE TA BLE 5 SEE TABLE 5 SEE TABLE 5 2.69 s !H - P) s 2.98 D D PERFORMED BY NLJ f,Jl.,j I Nl,S Ni:r /vL.j r,JLj /\)L::f (IJL-J f'1L-:r Nl,.J VERIFIED BY !AZZ QC) o* 0.0.30 >.n~ ~-'bi~ NIA '-{.b').S 0.,'2.52. NIA O.t$1 NIA C.'(C)';;t.. 90' o.o~P. 3,'6RO 3.t)t,<\ NIA 'i,gfo o.b55 O.b'ttf N/A I o.~fi"~ NIA C 180" I O.ei}O 3.,'ioS .l,..Cilil\  :,. 399 'i.S'lb 0.13R N/A 0.7~5 NIA o.qa,'1 C 270" -0.'"'I 3.Cj/'1 J~ct:i, N/A 'i,b<<i'f O.bSS 0-b'N NIA O.f,6a-. N/A _ NOTES:

1. TOLERANCE OF ALL DIMENSIONS SHOULD BE WITHIN :t I /I 6"; THE SHRINKAGE MEASUREMENT, K, SHALL BE MEASURED WITH A PROCESS WITH A REPEATABILITY WITHIN :!:.020. COMPONENT ID I WIB-228

2. WOL SURFACE FINISH TO BE 250 RMS OR BETTER.

3. LONG RANGE WAVINESS OF 1/32" OR LESS, OVER ANY AREA MATCHING THE LENGTH OF THE INSPECTION PROBE.

4. NOE INSPECTION IN ACCORDANCE WITH AZZ TRAVELER. 5t0 t-::0~120~~ D?.i'VE. SIJJE iC*)

5. A STAINLESS STEEL BUFFER LA YER SHALL BE INSTALLED. BU FFER LA YER TO CONSIST OF TWO LAYERS THAT COVER THE STAINLESS STEEL ELBOW, STAINLESS STEEL WELD AND THE STAINLESS STEEL PIPE. SIJ\'IAN=E GA ~C0:?4 WELD FIUER METAL SHALL BE SFA-5.9 ER30SL. CERTIFIED TO SECTION Ill, SUBSECTION NB.

6. WOL WELD FILLER METAL SHALL BE SFA-5.14 ERNiCrFe-7A (ALLOY 52M), CERTIFIED TO SECTION Ill, SUBSECTION NB.

_ 7. THE OVERLAY SHALL BE APPLIED WITH WATER SACKING FOR ALL LAYERS. WATER MAY BE FLOWING, STAGNANT OR A COMBINATION. B. WELD OVERLAY THICKNESS TO BE DETERMINED BY MECHANICAL MEASURING INSTRUMENTATION AND MAY BE VERIFIED BY OTHER QA INSPECTION METHODS IN SEPARATE REPORT.

9. THE TRANSfTION OF THE OVERLAY INTO THE BASE METAL SHALL HAVE AN INCLUDED ANGLE OF 135' OR GREATER FOR THE LAST .38" Of THE OVERLAY LENGTH.

10. DIMENSION APPLICABLE ATEXTRADOS ONLY

• A

[b

                                                                                                                                                                                                                                                                                          "'-'1 ;1       DONOTSCALEDRAWING                !"' 2of2'A 17               16                      15                    14               13                 12                      11                    10                                      8                                                                                                           3        I          2              i

OUTGOING CORRESPONDENCE SCREEN (Remove prior to NRC submittal) Document: PG&E Letter DCL-19-054

Subject:

Submittal of Acceptance Report following the Installation of Structural Weld Overlay, REP-RHR-SWOL in Unit 1 File Location: FSAR Update Review Utilizing the guidance in Xl3.ID2, does the FSAR Update need to be revised? Yes D No ~ If "Yes", submit an FSAR Update Change Request in accordance with Xl3.ID2 (or if this is an LAR, process in accordance with WG-9) There are no commitments in this letter. Commitment: Statement of Commitment: Clarification: None BEFORE OR AFTER LICENSE AMENDMENT RECEIPT When will commitment be implemented? Notification/Order# Task/Operation# Tracking Document: NAME ORGANIZATION CODE Assigned To: FIRM or TARGET DUE DATE: Commitment Code: YES or NO IF YES, WHICH? (E.G., 2R9, 1R10, ETC.) Outage Commitment? YES (Specify#) or NO IF YES, LIST THE IMPLEMENTING DOCUMENTS (IF KNOWN) New PCD Commitment? YES (Specify #) or NO IF YES, CLARIFY HOW COMMITMENT JS TO BE REVISED Modifies Existing Commitment in PCD? A member of the STARS Alliance Callaway

• Diablo Canyon
• Palo Verde
• Wolf Creek}}