05000321/LER-1982-089, Updated LER 82-089/01X-2:on 821104,during Cold Shutdown, Rejectable Linear Indications Discovered on Two RHR Welds & Five Recirculation Welds.Caused by Intergranular Stress Corrosion Cracking.Six Welds Repaired W/Weld Overlay M: Difference between revisions

From kanterella
Jump to navigation Jump to search
(StriderTol Bot insert)
 
(StriderTol Bot change)
Line 1: Line 1:
{{Adams
#REDIRECT [[05000321/LER-1982-089, Forwards LER 82-089/01T-0]]
| number = ML20071B393
| issue date = 02/17/1983
| title = Updated LER 82-089/01X-2:on 821104,during Cold Shutdown, Rejectable Linear Indications Discovered on Two RHR Welds & Five Recirculation Welds.Caused by Intergranular Stress Corrosion Cracking.Six Welds Repaired W/Weld Overlay Method
| author name = Sumner H
| author affiliation = GEORGIA POWER CO.
| addressee name =
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
| docket = 05000321
| license number =
| contact person =
| document report number = LER-82-089-01X, LER-82-89-1X, NUDOCS 8302280223
| package number = ML20071B379
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 3
}}
{{LER
| Title = Updated LER 82-089/01X-2:on 821104,during Cold Shutdown, Rejectable Linear Indications Discovered on Two RHR Welds & Five Recirculation Welds.Caused by Intergranular Stress Corrosion Cracking.Six Welds Repaired W/Weld Overlay Method
| Plant =
| Reporting criterion =
| Power level =
| Mode =
| Docket = 05000321
| LER year = 2082
| LER number = 89
| LER revision =
| Event date =
| Report date =
| ENS =
| abstract =
}}
 
=text=
{{#Wiki_filter:,
NISC FORM 366                                                                                                          U. S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT                      Update Report
* Previous Report Date 11-18-82 CONTROL BLOCK: l 1
l    l    l    l  l lh 6
(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 0 1 8  l9 Gl LICENSEE Al El CODE    Il Hl l!@15 0l 0l -l Ol 14                            Ol NUMBER LICENSE  0l Ol 0l -l Ol 26Ol@l          26    4LICENSE l ll ll TYPE II 1l@l JO I
57 CAT 68 l@
CON'T E      8 So          l Ll@l 015l 0l 0101312l 1]@l 111101418121@l 0l2l1l7l8l3lg 68    69      EVENT DATE          74      75      REPORT DATE        80 7                            60          61            DOCKET NUMBER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h IOl2llDuring the months of October and November, with the unit in cold shut-                                                                                        I o 3      ;down for refueling, augmented Inservice Inspections (ISI) were performed l g o ;,, ;on cielected welds. Rejectable linear indications were discovered on two l o 3 g RHR welds (20 and 24 inch piping) and five recirculation welds (22 inch l 0 6      l piping).                The health and safety of the public were not affected by this l lo;7; lnon-repetitive event.                                                                                                                                        l 10181I                                                                                                                                                              I DE            CODE      S BC E                  COMPONENT CODE                SUBCODE        S      E ITITI 7      8 l Cl Bl@ @@ W@ l Pl Il Pl El Xl Xl@ {@ y @
9        10        11            12            13                          18          19              20
_                                      SEQUENTIAL                        OCCURRENCE          REPORT                    REVISION LER/RO      EVENT YEAR                            REPORT NO.                          CCDE              TYPE                        NO.
O , ureg l218l2l g
23 l0l8l9[
24            26 y
27 l0l1l M      N l Xl 30 b31 y
32
_            22 K N A                      O PL NT          ME                    HOURS 22        SB 1            FOR      8.      SUPPL            MANUF CTURER l Xlggg 33          34 gg 35 gg 36            3l10l0l0              l 40 gg 41 gg 42 lN lg lG l0 l8 l0 [g 43            44            47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g lThe cause of this event has been determined to be Inter-Granular Stress l 3 ,      ; Corrosion Cracking (IGSCC). Six of the seven welds contained indicationsi
  , ,      lthat were above allowable limits for depth per ASME Code, and were re-                                                                                  l t a      lpaired using the weld overlay method. The seventh weld was not repaired l 3 ,      gb ut will be monitored by a local leak detection system.                                                                                                l 7      g g                                                                                                                                                        80 ST      S          % POWER                      OTHER STATUS            DIS O RY                            DISCOVERY DESCRIPTION i s      [ Hjg l 0l 0l 0lgl                            M                      [      [B lgl Inservice Inspection                                                l AfTivlTY      CO TENT AMOUN OF ACTIVITY                                                  LOCATION OF RELEASE i s      L_l SE@D OF RELEASEL3@l                                              I          I
* I 7
RELE 8 9                10          11                                      44            45                                                                  80 PERSONNEL EXPOSURES N                    TY f        DESCRIPT 1 7      l0 lL 9BEllg g gl                                                                                                                                      l
      '' ,ERSONN E L%u'AES '                    ''                                                                                                              '
DESCRIPTION 10ND'*iBED I I l
* I 7
i a 8 9                  11      12
                                        @l                                                                                                                        80 LOSS OF OR DAMAGE TO FACILITY DE SCRIPTION 7      8 9            10                                                                                                                                          80 PUBLICITY                Q                              8302280223 930217                                                      NRC USE ONLY          *
          'y                                              g            PDR ADOCK 05000321                                                                            .
L2_LOJ          Jl"_ED@
l              DESCRIPTION U                      S                              PDR                    __]       IlIllIIIIIIIII 7      8 9            10                                                                                                          68 69                        8n ;
NAME OF PREPARER
                                                                            ~
* t'      *
* PHONE:
912-367-7851                        {
 
_ , ,  _,-                                                    LER #:    50-321/1982-089, Rev. 2-
* LICENSEE: Georgia Power Conpany FACILITY:' Edwin I. Hatch DOCIGir #: 50-321 Narrative Report for LER 50-321/1982-089, Rev. 2 During the months of Oubia: and Novenber, with the unit in cold ' shutdown for
: refueling, augmented Inservice Inspections 1ITSI) were' performed on selected welds.- Rejectable indications were discovL 4 on two RHR welds and five re-circulation welds.
h recirculation welds were' four end cap-to-manifold welds and one manifold-to-sweepolet weld. '1he 4 end cap to-manifold welds had axial linear indications that ranged from 31 to 5, indications per end cap. _ 'Ite approximate maximum crack depth for indications ranged from 72% to.63% through wall. All four_end caps were overlayed with 308L weld naterial. During the overlay process on one of the end cap-to-mnifold welds, . leakage was observed. 'Ihe piping had a previously unde-tected axial crack approxistely 3/8 inches in. length. 'Ihis is a through wall crack violating 'Dech. Specs. requirementn of section 3.6.K. 'Ihe manifold was drained and repaired and overlay was ct,ntinued.1 'Ihe manifold to sweepolet weld had seven small ultrasonic indications transverse to_the weld. 'Ihe largest indication.was apptoxinately 12% through wall. 'Ihis weld was not repaired due
                              ~
to an evaluation that showed the safety factor _for these indications is well in excess of the safety factor inherent ~ in the AStE code. .'Ihe site, however, has installed a local leak detection system to nonitor'this weld during the next
                        ~
fuel cycle.
              'Ihe two RHR welds consisted of a 20 inch pipe-to-elbow weld and a 24 inch pipe-to-pipe weld.- 'Ihe pipe-to-elbow weld had one-linear axial indication. 3/8 of an' inch long with an estimated depth of 94% through_ wall aid a. linear ciretzn-ferential: indication.11/2 inches in length with an estinated depth of 33%        _
            ;through wall.- .Ihis. weld was overlayed with 308L' weld material. 'Ihe pipe-to-pipe weld had 6 axial linear indications 1/4 to 3/8 inches in length with a maxinun estimated depth of 47% through wall. _ 'Ihis weld was overlayed with' 308L weld material. After the pipe weld was coupleted indications were observed on the O.D. of the adjacent pipe during liquid perseLcuit_ testing (P/T). 'Ihese
            .. indications were ground out and the overlay was exteraded to centerline of the adjacent pipe to valve weld. Again indications were seen during P/T of the extended portion of the weld overlay material. After investigation it was discovered that the cause of these indications in the overlay naterial was the result of inconpatable weld materials (308L to inoonel). 'Ihe pipe-to-valve
: 1. weld was made with inoonel and had a cap layer of 309 stainless steel. 'Ihe cabersdad portion'of the pipe-to-pipe 308L weld material was ground off and -
re-welded using inoonel filler naterial. 'Ihis weld was P/T'd and showed no in-dications.
            ''Ihe repairs were done using the weld overlay method. This method establishes
            ' additional " cast-in-place" pipe wall thickness frun weld metal deposited 360 degrees around and to either side of the existing weld. 'Ihe weld deposited band over the cracks will provide wall thickness equal to that required to provide the original design safety margins. In addition, the weld metal depo-sition will produce a 'fa%rable cxmpressive residual stress pattern that is
,            beneficial in retardation of Intergranular Stress Corrosion Cracking (IGSOC) .
            - Ihe deposited weld metal, 308L or inoonel, is resistant to propagation of IGSCC cracks.
 
c , p.
All repairs were conducted in accordance with ASME Cbde, Section XI 1974 Edition, with Addenda through and including Sumer 1975. After conpletion of repairs, the weld overlay and the base metal within one inch on both ends of each overlay were examined by the liquid pewtrant nethod. In addition, an ultrasonic examination established the soundness of the weld overlay and was used to create a new base-line for Inservice Inspection. A hydrostatic test will be conducted prior to startup.
Ultrasonic and P/T examinations were in accordance with Section XI1977 Edition, with Addenda through and including Sumer 1978. 'Ihe hydrostatic test will be in accordance with Section XI IWA-5000 1974 Edition, with Addenda through and ir-c
        . cluding Sumer of 1975.
                                                -.-                              ._ ,    . - -
}}
 
{{LER-Nav}}

Revision as of 01:12, 30 March 2020

Redirect to:

Retrieved from "https://kanterella.com/w/index.php?title=05000321/LER-1982-089,_Updated_LER_82-089/01X-2:on_821104,during_Cold_Shutdown,_Rejectable_Linear_Indications_Discovered_on_Two_RHR_Welds_%26_Five_Recirculation_Welds.Caused_by_Intergranular_Stress_Corrosion_Cracking.Six_Welds_Repaired_W/Weld_Overlay_M&oldid=2722251"