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Post Office Box 2000, Decatur, Alabama 35609-2000
Post Office Box 2000, Decatur, Alabama 35609-2000


June 23, 2024                                                                     10 CFR 50.55a
June 23, 2024 10 CFR 50.55a


ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001
ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001


Browns Ferry Nuclear Plant, Unit 3 Renewed Facility Operating License No. DPR-68 NRC Docket No. 50-296
Browns Ferry Nuclear Plant, Unit 3 Renewed Facility Operating License No. DPR-68 NRC Docket No. 50-296
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American Society of Mechanical Engineers, Section XI, Fourth 10 Year Inspection Interval, Inservice Inspection, System Pressure Test, Containment Inspection, and Repair and Replacement Programs, Owners Activity Report for Browns Ferry Nuclear Plant, Unit 3, Cycle 21 Operation
American Society of Mechanical Engineers, Section XI, Fourth 10 Year Inspection Interval, Inservice Inspection, System Pressure Test, Containment Inspection, and Repair and Replacement Programs, Owners Activity Report for Browns Ferry Nuclear Plant, Unit 3, Cycle 21 Operation


cc (Enclosure):   NRC Regional Administrator - Region II NRC Senior Resident Inspector - Browns Ferry Nuclear Plant NRC Project Manager - Browns Ferry Nuclear Plant Enclosure
cc (Enclosure): NRC Regional Administrator - Region II NRC Senior Resident Inspector - Browns Ferry Nuclear Plant NRC Project Manager - Browns Ferry Nuclear Plant Enclosure


Tennessee Valley Authority
Tennessee Valley Authority
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See Enclosed
See Enclosed


FORM       OAR-1                     OWNER'S                           ACTIVITY                             REPORT
FORM OAR-1 OWNER'S ACTIVITY REPORT


Report Number                 _,B""F'--'N'--'----'U"--'3"-'R--"2=-1.,__ ___________________________________                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           _
Report Number _,B""F'--'N'--'----'U"--'3"-'R--"2=-1.,__ ___________________________________ _


Plant           Browns                   Ferry     Nuclear             Plant             P 0. Box               2000           Decatur               . AL   35609
Plant Browns Ferry Nuclear Plant P 0. Box 2000 Decatur. AL 35609


Unit   No       . --~3~-                                                                                                     date                                                                                         March                 1       1977                                                                                                                                                                 Refueling Outage         no               .           Refueling     Outage                 21
Unit No. --~3~- date March 1 1977 Refueling Outage no. Refueling Outage 21
{if applicable)                                                                 Commercial           service
{if applicable) Commercial service


Current Inspe   c     tion Interval         FO L![(h Ten             Y   ear     lnspectio~n~     ln=t~e~rv~a~I __________                                                                                                                                                   _______________                                                                                                                                                                                                                                                       _
Current Inspe c tion Interval FO L![(h Ten Y ear lnspectio~n~ ln=t~e~rv~a~I __________ _______________ _
(1st, 2nd,           3rd, other)
(1st, 2nd, 3rd, other)


Current Inspection         Period         ~T~h=ir~d~P_e=r~io~d~---------------------------------
Current Inspection Period ~T~h=ir~d~P_e=r~io~d~---------------------------------
(1st. 2nd.         3rd)
(1st. 2nd. 3rd)


2007     Edition                 , 2008   Addenda                         ( ISi)
2007 Edition, 2008 Addenda ( ISi)
Edition and               Addenda             of Section   X   I applicable to   the inspection       plans         ~2=0-'-1=3_,E=-d=i=ti=o~n__,_(=C~IS"'-'-'1)-----------------                                                                                                         ~
Edition and Addenda of Section X I applicable to the inspection plans ~2=0-'-1=3_,E=-d=i=ti=o~n__,_(=C~IS"'-'-'1)----------------- ~


0 -T PP -E NG -376.       Re   vision     0006,       02/07/2024 0-Tl-364   , Revision       0026,         11   /28/2023 Date and                 Revision of inspection                   plan                             0-TPP-ENG-467                       Revision       0002                   02/05/2024
0 -T PP -E NG -376. Re vision 0006, 02/07/2024 0-Tl-364, Revision 0026, 11 /28/2023 Date and Revision of inspection plan 0-TPP-ENG-467 Revision 0002 02/05/2024


Edition and               Addenda             of Section   X   I applicable to   repairs and                 replacemen                         ts,   if different than         the inspection plan     ~N~/A~--
Edition and Addenda of Section X I applicable to repairs and replacemen ts, if different than the inspection plan ~N~/A~--


Code         Cases     used       for inspection and               evaluation                       N-508     -4           N-532     -- 5           N -6 13-2             N-648-       1         N-702             and                 N- 7 16-1               N-747               N-864.
Code Cases used for inspection and evaluation N-508 -4 N-532 -- 5 N -6 13-2 N-648-1 N-702 and N-7 16-1 N-747 N-864.
(if applicable   , including       cases           modified by               Case       N-532 and               later revisions)
(if applicable, including cases modified by Case N-532 and later revisions)


CERTIFICATE         OF   CONFORMANCE
CERTIFICATE OF CONFORMANCE


I certify tl1at (a)         the statempn         tq m     a       de in this report are     corre ct; (b)         the exam                     inations           and                 tests meet the In         spection Plan       as         required by                 the ASME' Code       , Section                   XI;       and                 (c)       the repai,/replacement act   ivities and                 evaluations         supporting the comp                 letion of     --~U~     3~R~2~1 __               _
I certify tl1at (a) the statempn tq m a de in this report are corre ct; (b) the exam inations and tests meet the In spection Plan as required by the ASME' Code, Section XI; and (c) the repai,/replacement act ivities and evaluations supporting the comp letion of --~U~ 3~R~2~1 __ _
conform                       to 11,e   requireme                                           *' -,ec     tion                   XI.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           (refueling outage               number)
conform to 11,e requireme *' -,ec tion XI. (refueling outage number)


Signed ______________________                                                                                                                                                                                                                                                                                                                                                                                                                                               Date _______________                                                                                                                                                                                                                                                       _
Signed ______________________ Date _______________ _
Owner         or     Owner           s Designee       , Title
Owner or Owner s Designee, Title


CERTIFICATE         OF   INSERVICE                 INSPECTION
CERTIFICATE OF INSERVICE INSPECTION


I, the undersigned,     holding a         valid commission                     issued by                 the Na       tiona                     l Board         of Boiler and                 Pressure Vessel Inspectors   and                 employed             by                 The Hartford Steam       Boiler Inspection       and                   In       surance                       Company                                 of Hartford Connecticu                   t have       inspected the items described in this Owner's     Activity Report and                 state tha     t, to       the best of my                 knowledge           and                 be       lief, the Owner         has       performed all activities represented by                 this report in   accordance                                 w     ith the requirements of Section XI.
I, the undersigned, holding a valid commission issued by the Na tiona l Board of Boiler and Pressure Vessel Inspectors and employed by The Hartford Steam Boiler Inspection and In surance Company of Hartford Connecticu t have inspected the items described in this Owner's Activity Report and state tha t, to the best of my knowledge and be lief, the Owner has performed all activities represented by this report in accordance w ith the requirements of Section XI.
By         signing this certificate neither the In         spector n     or   his emp         loyer   makes             any                       war         ranty,               expressed or     im plied   , concerning                         the repair/replacement activities and                 evaluation           described in   this report. Furthermore,     n     e ither the Inspector     nor           his employer         shall be         liable in   any                       manner                       for   any                       persona             l injury or     property damage                       *r lo       s of an                                                                                                                                                                                                                                           r connected                       with this In         spection.
By signing this certificate neither the In spector n or his emp loyer makes any war ranty, expressed or im plied, concerning the repair/replacement activities and evaluation described in this report. Furthermore, n e ither the Inspector nor his employer shall be liable in any manner for any persona l injury or property damage *r lo s of an r connected with this In spection.
                        'w;                                     ~                                                                                                                                                                                                                                                                                                                                                                                                                   /'1*1"11
'w; ~ /'1*1"11


    --;--f,-'-"---,.,-:-':-::&c~+/---:._,,...,.--=--+------                                                                                                                                                                                                                                                                                                                           --'--""'Na'-ti-on-al~B.,_oa~,d=-N-u-'-m-be-r a-n~d ~En-do-rs_e_m-en-,       --'-'--'---J/'---Comm                       issions                                 N ;3                                                 i '19   '7 1                                                                                                       -r , IV                                           R..
--;--f,-'-"---,.,-:-':-::&c~+/---:._,,...,.--=--+------ --'--""'Na'-ti-on-al~B.,_oa~,d=-N-u-'-m-be-r a-n~d ~En-do-rs_e_m-en-, --'-'--'---J/'---Comm issions N ;3 i '19 '7 1 -r, IV R..


Date __     l;)'--lif----+,-"=--------/,/       lo/                             1                 vt FORM       OAR-1                                 OWNER'S                           ACTIVITY                             REPORT
Date __ l;)'--lif----+,-"=--------/,/ lo/ 1 vt FORM OAR-1 OWNER'S ACTIVITY REPORT


TABLES Report       Number                                                                           BFN       U3R21 ------           -                           -----             --------------                                                     ---                                   -                                   -
TABLES Report Number BFN U3R21 ------ - ----- -------------- --- - -
PI ant                                                                                 Browns                             Ferry Unit         No             .                                                           3                                                                                                                             Commercial                             service date                                                     03/01/1977                                                           Refueling     outage                               no                       .                                                       21 -                             ---
PI ant Browns Ferry Unit No. 3 Commercial service date 03/01/1977 Refueling outage no. 21 - ---
Current         inspection               interval                                                                 4th                                                                                                                                                                                                                                                                         Current         inspection                 period                                                             3rd -----                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     -----             --
Current inspection interval 4th Current inspection period 3rd ----- ----- --
TABLE             1 ITEMS   WITH                   FLAWS                         OR       RELEVANT                           CONDITIONS       THAT       REQUIRE EVALUATIONS                                               FOR     CONTINUED                       SERVICE Exam                                     ination Category                         and Item       Number                                                                 Item       Description                                                                                                                                                                                                                                                                                                                                                           Evaluation                               Description CR       1911989,   NOi U3R21-001
TABLE 1 ITEMS WITH FLAWS OR RELEVANT CONDITIONS THAT REQUIRE EVALUATIONS FOR CONTINUED SERVICE Exam ination Category and Item Number Item Description Evaluation Description CR 1911989, NOi U3R21-001


During   VT-3               examination                                     of Mechanical                   Snubber Support,       3-47B400-75     , examiners                       identified the pin was                 displaced, not           fully engaged                       with the suppo                   rt bracket,           resulting in   examination                                       failure.
During VT-3 examination of Mechanical Snubber Support, 3-47B400-75, examiners identified the pin was displaced, not fully engaged with the suppo rt bracket, resulting in examination failure.
Civil Engineering   evaluated           the condition               and F-A /   F1.10D                                                 Main           Steam           System           Snubber,                                                                                                                                               concluded                               that the snubber                                       in   the "as           found                       "
Civil Engineering evaluated the condition and F-A / F1.10D Main Steam System Snubber, concluded that the snubber in the "as found "
3-4 7B40 0- 75                                                                                                                                                                                                                                                     condition             would                     still be           able           to     perform its intended design function                 and                       sustain       the imposed         design seismic loads.                             The   design loads     would                   have been                     transferred from       the main                   steam           piping to   the EL   584   ' floor steel features.     The snubber                                         pin was reinstalled and                       a             new                   cotter pin was                   installed topside of the support       bracket.                     The support   was then   re examined                               with no                       recordable               indication.
3-4 7B40 0- 75 condition would still be able to perform its intended design function and sustain the imposed design seismic loads. The design loads would have been transferred from the main steam piping to the EL 584 ' floor steel features. The snubber pin was reinstalled and a new cotter pin was installed topside of the support bracket. The support was then re examined with no recordable indication.
CR       1914074, WO                   124338851   , NOi U3R21-003
CR 1914074, WO 124338851, NOi U3R21-003


During   Owner               Elected VT-3                 examination                                 of 3-47B455-628   the variable   spring support was observed               at   an                         as           found                       setting of 1650 lbs.         The High Pressure Coolant                       Injection                                                                                               affected support     nominal                             range               setting is 1663 -
During Owner Elected VT-3 examination of 3-47B455-628 the variable spring support was observed at an as found setting of 1650 lbs. The High Pressure Coolant Injection affected support nominal range setting is 1663 -
F-A /   F1 .20C                                             System           Support     , 3-47B455   -628                                                                                                   1738 lbs.         The   as           found                       setting was                   roughly               1 %
F-A / F1.20C System Support, 3-47B455 -628 1738 lbs. The as found setting was roughly 1 %
outside of the acceptable                       nominal                               range, constituting a           relevant condition               as           defined in     IWF-3410(a)(4)             , "Improper             hot or       cold     settings of spring supports" .         The   spring can                             was                   reset to       1700 lbs.
outside of the acceptable nominal range, constituting a relevant condition as defined in IWF-3410(a)(4), "Improper hot or cold settings of spring supports". The spring can was reset to 1700 lbs.
and                         an                       a         s left examination                                         was                   performed with no relevant indications identified.
and an a s left examination was performed with no relevant indications identified.
FORM       OAR-1                                 OWNER'S                         ACTIVITY                             REPORT
FORM OAR-1 OWNER'S ACTIVITY REPORT


TABLES Report Number                                                                                                           BFN       U3R21 -------------------------------
TABLES Report Number BFN U3R21 -------------------------------
PI ant                                                                                               Browns                         Ferry Unit       No             .                                                         3                                                                                                                                               Commercial                     service date                                                       03/01/1977                                                       Refueling outage                           no                       .                                                     21 ----
PI ant Browns Ferry Unit No. 3 Commercial service date 03/01/1977 Refueling outage no. 21 ----
Current inspection   interval                                                                     4th -----                                                                                                                                                                                           Current   inspection   period                                                             3rd -------
Current inspection interval 4th ----- Current inspection period 3rd -------
TABLE           2 AB     STRACT           OF     REPAIR/REPLACEMENT                           ACTIVITIES                         REQUIRED                         FO R CONTINUED                       SERVICE Code                                                                                                                   Item       Description                                                                                                                                                                                     Description       of   Work                                                                                                                                                                                                             Date                                                                                                     Repair/Replacement Class                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Completed                                                                                                                                       Plan             Number During     a             pre-shutdown                     walk down                               a           defect was                   revealed when                     a             1/2"             drain     pipe sheared       at the heat affected zone                   at the Tee-to-Pipe interface due             to cyclic       fatigue cracking               .         (The valve at the end           of the pipe was not           supported       and                     created     a catalever   at the pipe-to-tee joint.)
TABLE 2 AB STRACT OF REPAIR/REPLACEMENT ACTIVITIES REQUIRED FO R CONTINUED SERVICE Code Item Description Description of Work Date Repair/Replacement Class Completed Plan Number During a pre-shutdown walk down a defect was revealed when a 1/2" drain pipe sheared at the heat affected zone at the Tee-to-Pipe interface due to cyclic fatigue cracking. (The valve at the end of the pipe was not supported and created a catalever at the pipe-to-tee joint.)


The defect was                   removed                   and                           21       ,
The defect was removed and 21,
Replace         reducing             Pipe                             Engineering     Change                         (BFN                                     Tee   upstream             of valve                                             010   (AWA-TVA-2024-04                                   38))   t~
Replace reducing Pipe Engineering Change (BFN Tee upstream of valve 010 (AWA-TVA-2024-04 38)) t~
2                                                                                   BFN-3-VTV-074-0683A                                                                   was                   performed to   replace a             c-     o-                                                                                       03/25/2024                                                                                                                                       124312449 with a           90-degree elbow                                                   degree elbow               joint removing                 the and                       reducing             insert                                               catalever   design issue with the drain     valve.
2 BFN-3-VTV-074-0683A was performed to replace a c-o- 03/25/2024 124312449 with a 90-degree elbow degree elbow joint removing the and reducing insert catalever design issue with the drain valve.


The   cause                         of the unacceptab                                                       ility is being           documented                                               in   the BFN corrective action                 program                         CR 1911200 with an                     engineering evaluation                     shown                                 in the Prompt Determination     of Operability (PDQ) 1911200.               An                 ECP was created     to   address   the issue to prevent reoccurance                                                 .
The cause of the unacceptab ility is being documented in the BFN corrective action program CR 1911200 with an engineering evaluation shown in the Prompt Determination of Operability (PDQ) 1911200. An ECP was created to address the issue to prevent reoccurance.
FORM       OAR-1                               OWNER'S                           ACTIVITY                             REPORT
FORM OAR-1 OWNER'S ACTIVITY REPORT


TABLES Report Number                                                                                               BFN     U3R21 ---------                                                   -                                 ----------                                                         -                                 ------
TABLES Report Number BFN U3R21 --------- - ---------- - ------
PI ant                                                                                               Browns                         Ferry Unit       No.                                                                         3                                                                                                                                               Commercial                     service date                                                         03/01/1977                                                       Refueling outage                             no                       .                                                     21 ----
PI ant Browns Ferry Unit No. 3 Commercial service date 03/01/1977 Refueling outage no. 21 ----
Current inspection   interval                                                                     4th ----                                                                                                                                                                                               Current inspection   period                                                                 3rd ------
Current inspection interval 4th ---- Current inspection period 3rd ------
REPORTING             REQUIRED                       BY           10   CFR       50.55a(b)(2)(ix)(A)
REPORTING REQUIRED BY 10 CFR 50.55a(b)(2)(ix)(A)
ASME       Section                       XI,       Subsection                                                         IWE Steel Containment                                                         Vessel           Inspection                                     program
ASME Section XI, Subsection IWE Steel Containment Vessel Inspection program


10   CFR     50.55a(b               )(2)(ix)(A)   requires reporting of the degradation                   assessment                   for inaccessible       areas                   when                       conditions                 are         identified in accessible         areas                 during     the perform a             nce                   of the ASME     Section         XI,         Subsection                                   IWE                 Steel Containment                                   Vessel   (SCV)
10 CFR 50.55a(b )(2)(ix)(A) requires reporting of the degradation assessment for inaccessible areas when conditions are identified in accessible areas during the perform a nce of the ASME Section XI, Subsection IWE Steel Containment Vessel (SCV)
Inspection                   Program                         that could                   indicate the presence             of or       result in   degradation                 to   such inaccessible         areas.
Inspection Program that could indicate the presence of or result in degradation to such inaccessible areas.


During         BFN     U3R21,                           isolat ed       locations             of the Moisture Seal Barrier (MSB) of the SCV                 was identified to             have             disbonding                     conditions                   requiring excavations                                                 and                         examination                                           of in acc                           e ssi   le areas                 beneath                             the barrier.           The     inaccessible       areas               of the SCV                     Le   neath             the MSB we                 rP-. determined to     be               acceptable                                 by                           General     Visual             examinat                                       ion           .           Th   e P. Xam                             ination irlGntifa:. d
During BFN U3R21, isolat ed locations of the Moisture Seal Barrier (MSB) of the SCV was identified to have disbonding conditions requiring excavations and examination of in acc e ssi le areas beneath the barrier. The inaccessible areas of the SCV Le neath the MSB we rP-. determined to be acceptable by General Visual examinat ion. Th e P. Xam ination irlGntifa:. d
* 1:J     evidence         of complete         separation                 from       the drywell liner that wou;                                 ~1 ailow moistu         1 *~: to           enter the area                   below                     the seal.           Conditions         were     corrected     by                             clea               n           ing                   and replacing damaged                                         areas               of the MSB with no                       Repair/     Replacement                   Activity required.}}
* 1:J evidence of complete separation from the drywell liner that wou; ~1 ailow moistu 1 *~: to enter the area below the seal. Conditions were corrected by clea n ing and replacing damaged areas of the MSB with no Repair/ Replacement Activity required.}}

Latest revision as of 14:04, 4 October 2024

American Society of Mechanical Engineers,Section XI, Fourth 10 Year Inspection Interval, Inservice Inspection, System Pressure Test, Containment Inspection, and Repair and Replacement Programs, Owner’S Activity Report Cycle 21 Oper
ML24176A113
Person / Time
Site: Browns Ferry Tennessee Valley Authority icon.png
Issue date: 06/23/2024
From: Sivaraman M
Tennessee Valley Authority
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
Download: ML24176A113 (1)
v • d • e


Text

VALLEY TENNESSEE 1\\14 AUTHORITY

Post Office Box 2000, Decatur, Alabama 35609-2000

June 23, 2024 10 CFR 50.55a

ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Browns Ferry Nuclear Plant, Unit 3 Renewed Facility Operating License No. DPR-68 NRC Docket No. 50-296

Subject:

American Society of Mechanical Engineers,Section XI, Fourth 10 Year Inspection Interval, Inservice Inspection, System Pressure Test, Containment Inspection, and Repair and Replacement Programs, Owners Activity Report for Browns Ferry Nuclear Plant, Unit 3, Cycle 21 Operation

The Tennessee Valley Authority is submitting the Browns Ferry Nuclear Plant (BFN), American Society of Mechanical Engineers (ASME),Section XI, Owners Activity Report for BFN, Unit 3, Cycle 21 Operation. The report is contained in the enclosure to this letter and is in accordance with the requirements of ASME Code Case N-532-5, Repair/Replacement Documentation Requirements and Inservice Summary Report Preparation and Submission,Section XI, Division 1.

The report is an overview of the inservice examination results that were performed on components within the ASME Section XI boundary, up to and including the BFN, Unit 3, Cycle 21 refueling outage, during the third inspection period of the Fourth 10 Year Inspection Interval. The applicable provisions of the ASME Code Case N-532-5 require that this report be submitted within 90 calendar days of the completion of each refueling outage. The BFN, Unit 3, Cycle 21 refueling outage ended on March 24, 2024. Accordingly, this submittal is due by June 22, 2024.

U.S. Nuclear Regulatory Commission Page 2 June 23, 2024

There are no new regulatory commitments contained in this letter. Should you have any questions concerning this submittal, please contact David Renn, Site Licensing Manager, at (256) 729-2636.

Respectfully,

Manu Sivaraman Site Vice President

Enclosure:

American Society of Mechanical Engineers,Section XI, Fourth 10 Year Inspection Interval, Inservice Inspection, System Pressure Test, Containment Inspection, and Repair and Replacement Programs, Owners Activity Report for Browns Ferry Nuclear Plant, Unit 3, Cycle 21 Operation

cc (Enclosure): NRC Regional Administrator - Region II NRC Senior Resident Inspector - Browns Ferry Nuclear Plant NRC Project Manager - Browns Ferry Nuclear Plant Enclosure

Tennessee Valley Authority

Browns Ferry Nuclear Plant Unit 3

American Society of Mechanical Engineers,Section XI, Fourth 10 Year Inspection Interval, Inservice Inspection, System Pressure Test, Containment Inspection, and Repair and Replacement Programs, Owners Activity Report for Browns Ferry Nuclear Plant, Unit 3, Cycle 21 Operation

See Enclosed

FORM OAR-1 OWNER'S ACTIVITY REPORT

Report Number _,B""F'--'N'--'----'U"--'3"-'R--"2=-1.,__ ___________________________________ _

Plant Browns Ferry Nuclear Plant P 0. Box 2000 Decatur. AL 35609

Unit No. --~3~- date March 1 1977 Refueling Outage no. Refueling Outage 21

{if applicable) Commercial service

Current Inspe c tion Interval FO L![(h Ten Y ear lnspectio~n~ ln=t~e~rv~a~I __________ _______________ _

(1st, 2nd, 3rd, other)

Current Inspection Period ~T~h=ir~d~P_e=r~io~d~---------------------------------

(1st. 2nd. 3rd)

2007 Edition, 2008 Addenda ( ISi)

Edition and Addenda of Section X I applicable to the inspection plans ~2=0-'-1=3_,E=-d=i=ti=o~n__,_(=C~IS"'-'-'1)----------------- ~

0 -T PP -E NG -376. Re vision 0006, 02/07/2024 0-Tl-364, Revision 0026, 11 /28/2023 Date and Revision of inspection plan 0-TPP-ENG-467 Revision 0002 02/05/2024

Edition and Addenda of Section X I applicable to repairs and replacemen ts, if different than the inspection plan ~N~/A~--

Code Cases used for inspection and evaluation N-508 -4 N-532 -- 5 N -6 13-2 N-648-1 N-702 and N-7 16-1 N-747 N-864.

(if applicable, including cases modified by Case N-532 and later revisions)

CERTIFICATE OF CONFORMANCE

I certify tl1at (a) the statempn tq m a de in this report are corre ct; (b) the exam inations and tests meet the In spection Plan as required by the ASME' Code,Section XI; and (c) the repai,/replacement act ivities and evaluations supporting the comp letion of --~U~ 3~R~2~1 __ _

conform to 11,e requireme *' -,ec tion XI. (refueling outage number)

Signed ______________________ Date _______________ _

Owner or Owner s Designee, Title

CERTIFICATE OF INSERVICE INSPECTION

I, the undersigned, holding a valid commission issued by the Na tiona l Board of Boiler and Pressure Vessel Inspectors and employed by The Hartford Steam Boiler Inspection and In surance Company of Hartford Connecticu t have inspected the items described in this Owner's Activity Report and state tha t, to the best of my knowledge and be lief, the Owner has performed all activities represented by this report in accordance w ith the requirements of Section XI.

By signing this certificate neither the In spector n or his emp loyer makes any war ranty, expressed or im plied, concerning the repair/replacement activities and evaluation described in this report. Furthermore, n e ither the Inspector nor his employer shall be liable in any manner for any persona l injury or property damage *r lo s of an r connected with this In spection.

'w; ~ /'1*1"11

--;--f,-'-"---,.,-:-':-::&c~+/---:._,,...,.--=--+------ --'--""'Na'-ti-on-al~B.,_oa~,d=-N-u-'-m-be-r a-n~d ~En-do-rs_e_m-en-, --'-'--'---J/'---Comm issions N ;3 i '19 '7 1 -r, IV R..

Date __ l;)'--lif----+,-"=--------/,/ lo/ 1 vt FORM OAR-1 OWNER'S ACTIVITY REPORT

TABLES Report Number BFN U3R21 ------ - ----- -------------- --- - -

PI ant Browns Ferry Unit No. 3 Commercial service date 03/01/1977 Refueling outage no. 21 - ---

Current inspection interval 4th Current inspection period 3rd ----- ----- --

TABLE 1 ITEMS WITH FLAWS OR RELEVANT CONDITIONS THAT REQUIRE EVALUATIONS FOR CONTINUED SERVICE Exam ination Category and Item Number Item Description Evaluation Description CR 1911989, NOi U3R21-001

During VT-3 examination of Mechanical Snubber Support, 3-47B400-75, examiners identified the pin was displaced, not fully engaged with the suppo rt bracket, resulting in examination failure.

Civil Engineering evaluated the condition and F-A / F1.10D Main Steam System Snubber, concluded that the snubber in the "as found "

3-4 7B40 0- 75 condition would still be able to perform its intended design function and sustain the imposed design seismic loads. The design loads would have been transferred from the main steam piping to the EL 584 ' floor steel features. The snubber pin was reinstalled and a new cotter pin was installed topside of the support bracket. The support was then re examined with no recordable indication.

CR 1914074, WO 124338851, NOi U3R21-003

During Owner Elected VT-3 examination of 3-47B455-628 the variable spring support was observed at an as found setting of 1650 lbs. The High Pressure Coolant Injection affected support nominal range setting is 1663 -

F-A / F1.20C System Support, 3-47B455 -628 1738 lbs. The as found setting was roughly 1 %

outside of the acceptable nominal range, constituting a relevant condition as defined in IWF-3410(a)(4), "Improper hot or cold settings of spring supports". The spring can was reset to 1700 lbs.

and an a s left examination was performed with no relevant indications identified.

FORM OAR-1 OWNER'S ACTIVITY REPORT

TABLES Report Number BFN U3R21 -------------------------------

PI ant Browns Ferry Unit No. 3 Commercial service date 03/01/1977 Refueling outage no. 21 ----

Current inspection interval 4th ----- Current inspection period 3rd -------

TABLE 2 AB STRACT OF REPAIR/REPLACEMENT ACTIVITIES REQUIRED FO R CONTINUED SERVICE Code Item Description Description of Work Date Repair/Replacement Class Completed Plan Number During a pre-shutdown walk down a defect was revealed when a 1/2" drain pipe sheared at the heat affected zone at the Tee-to-Pipe interface due to cyclic fatigue cracking. (The valve at the end of the pipe was not supported and created a catalever at the pipe-to-tee joint.)

The defect was removed and 21,

Replace reducing Pipe Engineering Change (BFN Tee upstream of valve 010 (AWA-TVA-2024-04 38)) t~

2 BFN-3-VTV-074-0683A was performed to replace a c-o- 03/25/2024 124312449 with a 90-degree elbow degree elbow joint removing the and reducing insert catalever design issue with the drain valve.

The cause of the unacceptab ility is being documented in the BFN corrective action program CR 1911200 with an engineering evaluation shown in the Prompt Determination of Operability (PDQ) 1911200. An ECP was created to address the issue to prevent reoccurance.

FORM OAR-1 OWNER'S ACTIVITY REPORT

TABLES Report Number BFN U3R21 --------- - ---------- - ------

PI ant Browns Ferry Unit No. 3 Commercial service date 03/01/1977 Refueling outage no. 21 ----

Current inspection interval 4th ---- Current inspection period 3rd ------

REPORTING REQUIRED BY 10 CFR 50.55a(b)(2)(ix)(A)

ASME Section XI, Subsection IWE Steel Containment Vessel Inspection program

10 CFR 50.55a(b )(2)(ix)(A) requires reporting of the degradation assessment for inaccessible areas when conditions are identified in accessible areas during the perform a nce of the ASME Section XI, Subsection IWE Steel Containment Vessel (SCV)

Inspection Program that could indicate the presence of or result in degradation to such inaccessible areas.

During BFN U3R21, isolat ed locations of the Moisture Seal Barrier (MSB) of the SCV was identified to have disbonding conditions requiring excavations and examination of in acc e ssi le areas beneath the barrier. The inaccessible areas of the SCV Le neath the MSB we rP-. determined to be acceptable by General Visual examinat ion. Th e P. Xam ination irlGntifa:. d

  • 1:J evidence of complete separation from the drywell liner that wou; ~1 ailow moistu 1 *~: to enter the area below the seal. Conditions were corrected by clea n ing and replacing damaged areas of the MSB with no Repair/ Replacement Activity required.
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