05000334/LER-1981-091, Updated LER 81-091/01X-1:on 811029,break in Redundant Underground 12-inch Supply Header Resulted in Loss of Fire Water Sys.Caused by External Finger Corrosion Along Pipe Bottom.Total Sys Piping change-out Not Warranted: Difference between revisions

From kanterella
Jump to navigation Jump to search
(StriderTol Bot insert)
 
(StriderTol Bot change)
 
Line 1: Line 1:
{{Adams
#REDIRECT [[05000334/LER-1981-091, Forwards Updated LER 81-091/01X-1]]
| number = ML20069K331
| issue date = 10/11/1982
| title = Updated LER 81-091/01X-1:on 811029,break in Redundant Underground 12-inch Supply Header Resulted in Loss of Fire Water Sys.Caused by External Finger Corrosion Along Pipe Bottom.Total Sys Piping change-out Not Warranted
| author name =
| author affiliation = DUQUESNE LIGHT CO.
| addressee name =
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
| docket = 05000334
| license number =
| contact person =
| document report number = LER-81-091-01X, LER-81-91-1X, NUDOCS 8210260167
| package number = ML20069K322
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 2
}}
{{LER
| Title = Updated LER 81-091/01X-1:on 811029,break in Redundant Underground 12-inch Supply Header Resulted in Loss of Fire Water Sys.Caused by External Finger Corrosion Along Pipe Bottom.Total Sys Piping change-out Not Warranted
| Plant =
| Reporting criterion =
| Power level =
| Mode =
| Docket = 05000334
| LER year = 2081
| LER number = 91
| LER revision =
| Event date =
| Report date =
| ENS =
| abstract =
}}
 
=text=
{{#Wiki_filter:.          .h 3C FORM 366                                                                                                                      U. S. NUCLEAR REGULATOCY COMMISSitN
: 77)                              UPDATE PIPORT - Previous Report Date 11/12/81 LICENSEE EVENT REPORT CONTROL BLOCK: l                  l  l    l    l  l    l                    (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1                                6
' l 18 l9 l P l UCENSEE A l B CODE    l V l S 14l 1 l@l  15 0 l 0 l- l UCENSE 0 l 0 NUM8ER l 0 l 0 l 0 l- l0 l250 l@l4        26 l1 l1 l1 l1 l@l57 CAT LICENSE TYPE Jo l
58 l@
ON'T
)ltl              Z,"c' l L @l 0 l 5 l 0 l 0 l 0 l 3 l 3 l69 4 @l 1 lq l7lolnl1l@l1l0l1l1l8l2l@
68                                        74      75      REPORT DATE        80 8                    60              61            OOCKET NUMBER                                EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 3121l            On 10/29/81 at 1320 hours , a break in a redundan t underground 12 inch supp1v header                                                                            l 3 lal I          resulted in the temporary loss.of the fire water system (Tech. Spec 3.7.14.1) .                                                                                  l 314 I l          Tr public health and safety wasn't affected since backup fire protection uas                                                                                    l 0l3l l            avai?able, the system was returned to service in approximately one hour and fire                                                                                l 0 l6 l l          Patches were established during the time required to identify which of the ad-                                                                                    l ol7ll              'ac nt supply headers was broken. This is the third failure of this type.                                                                                      l l
0181l                                                                                                                                                                          80 8 9 SYSTEM            CAUSE          CAUSE                                                        COMP.          VALVE CODE              CODE        SU8 CODE                  COMPONENT CODE                    SU8 CODE          SUSCODE 3_j 9j 8
lA l Blh l B lh l C lh l Pl Il ?l E l X l X lh lD lh l Zlh 9            10        11            12            13                              18            19              20 SEQUE NTI AL                        OCCURRENCE              REPORT                    REVISION EVENT YE AR                                REPORT NO.                              CODE                  TYPE                        NO.
u'E 18 O "LERrRO 21 Il l 22 I-I 23 l o 19 Il I 24            26 l'l 27 lo Il I 28        29 I XI 30 l-l 31 I ll 32 T K N      C ON                ON PL NT          ME                      HOURS              SB 1            FOR b B.            SU PL1            MANUF CTURER l33t l@lJ4X l@                  l2l@
35 l ', l@
                                                              'J6 l0 l0l0l0l 37                    40 W@
41 lN[g 42 lAl@
43 l44Z l 9 l 9 l 947 l@
CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1 loll          The ruptired section was renlaced and returned to service on 11/1/81. Broken                                                                                      l
: li I l        crctions were analyzed and found to have external finger corrosion alone                                                                                        l
  , l 71 l        the pipe botton. An engineering analysis uns performed indicating that the corrosion l
, g 31 l          prcblem was not severe enough to warrant total systen piping change-out at th is                                                                                l t'"c.                                                                                                                                                          I il4l [
80 a 9 ST      S        4 POWER                          OTHER STA TUS              Dis      RY                            OlSCOVERY DESCRIPTION l  isi l i@ l'                    l      l      l@lo                              44 l      I 45 l@ias                                                                      80 l
        # '                                    12 4CTiviiv    cO0 TENT RELEASED OF RELE ASE                        AMOUNT OF ACTIVITY                                                        LOCATION OF RELEASE N/A                    l          l                                          N/A                                l t
l68 ]9 l Z l h l Zl@l 10              11                                        44            45                                                                          80 PERSONNEL E XPOSURES NUM8ER                TYPE        DESCRIPTION 1
l7l* *M 0l0l@lZl@l"                #
N/A                                                                                                                l
                *EnSONNEl.' N;u'At ES NuvsEn                oEScnietiONh N/A                                                                                                                l 1
l x4 l9 l 0 l 0 l 0 l@l12 11
                                                                                                                    --                                                        80 t oSS or an 04 vane TO raciu rv /Ih                        B210260167 821011 tvaE    oEScmarinN                      O              PDR ADOCK 05000334 y lZ]@l -s    a        o N/      S                                PDR 80 l
            %U E        E CR'PT80N 2101                hl                                        N/A                                                                              l    ll llIllIl!l!l,I
 
. IE Attachment to LER 81-91/01X-1 Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 On 10/29/81 at 1320 hours, a fire line break, in a redundant underground 12 inch supply header between fire system valves [FP-5] and [FP-11], resulted in the temporary loss of the Fire Protection Water System.
From the results of an analysis of the broken pipe section, performed by the Industrial Testing Laboratory (ITL), it was concluded that the break had occurred from a slight bending moment being applied to the pipe, in an area that was greatly weakened by external finger corrosion. The moment required for fracture was much less than expected to fracture the pipe due to the corrosion present. The corrosion was apparently not stress corrosion because cracking was not the forn,. nor was it from an electrolytic mechanism. The bituminous coating was breached in 'hpots" on the pipe bottom and was almost continuolusly missing from the top and grades in between. It was concluded that the origin of the corrosion must have originated in the pipe bedding material.
Subsequent to this incident, on 9/8/82 another segment of the fire line failed. Pipe segments were sent to ITL for analysis. Their conclusions to the mode of failure paralleled initial engineering observations that crack initiation at the break site resulted from over torquing of retainer flange setscrews upon initial installation of the line. Crack growth then continued due to bedding erosion caused by leakage from the crack and that this bedding erosion coupled with an already induced crack resulted in the complete failure. External finger corrosion which had greatly reduced the pipe wall thickness causing the incident which led to this LER was not evident. Because no connection was drawn between these most recent pipe failures, the station does not feel that a total piping replacen.ent of the cast iron fire line is warranted at this time.
}}
 
{{LER-Nav}}

Latest revision as of 03:04, 24 May 2020

Redirect to:

Retrieved from "https://kanterella.com/w/index.php?title=05000334/LER-1981-091,_Updated_LER_81-091/01X-1:on_811029,break_in_Redundant_Underground_12-inch_Supply_Header_Resulted_in_Loss_of_Fire_Water_Sys.Caused_by_External_Finger_Corrosion_Along_Pipe_Bottom.Total_Sys_Piping_change-out_Not_Warranted&oldid=2825335"