ML19242D205: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
 
(Created page by program invented by StriderTol)
 
Line 18: Line 18:
=Text=
=Text=
{{#Wiki_filter:A y.
{{#Wiki_filter:A y.
-  ,
HARTSVILLE AND PHIPPS BEND NUCLEAR PLANTS - ALL UNITS FAULTY WELDING BY LAKESIDE BRIDGE AFD STEEL ON DRYWELL VENT STRUCTURE AND REACTOR PRESSURE VESSEL PEDESTAL 10CFR50.55(e) REPORT NLHBER 1 (INTERIM)
HARTSVILLE AND PHIPPS BEND NUCLEAR PLANTS - ALL UNITS FAULTY WELDING BY LAKESIDE BRIDGE AFD STEEL ON DRYWELL VENT STRUCTURE AND REACTOR PRESSURE VESSEL PEDESTAL 10CFR50.55(e) REPORT NLHBER 1 (INTERIM)
NCR'S HNP-A-038, HNP-A-050, HNP-B-024, AND PBN-028
NCR'S HNP-A-038, HNP-A-050, HNP-B-024, AND PBN-028 On June 6,1979, TVA notified NRC-OIE Region II Inspector, W. B. Swan, of a potentially reportable 10CFR50.55(e) condition that has 10CFR Part 21 impli-cations regarding a breakdown in the quality contrcl program at Lakeside Bridge and Steel (Lakeside) . The breakdown involvec the shfpment of the drywell veat structure and the reactor pressure vessel (RPV) pedestal by Lakeside with buttered edges that have been found by TVA forr:es to contain enough porosity, lack of fusion, and slag inclusion to be deemed unacceptable per the American Welding Society (AWS), code D1.1.      This is an interim report on the subject NCR's.
              ,.
On June 6,1979, TVA notified NRC-OIE Region II Inspector, W. B. Swan, of a potentially reportable 10CFR50.55(e) condition that has 10CFR Part 21 impli-cations regarding a breakdown in the quality contrcl program at Lakeside Bridge and Steel (Lakeside) . The breakdown involvec the shfpment of the drywell veat structure and the reactor pressure vessel (RPV) pedestal by Lakeside with buttered edges that have been found by TVA forr:es to contain enough porosity, lack of fusion, and slag inclusion to be deemed unacceptable per the American Welding Society (AWS), code D1.1.      This is an interim report on the subject NCR's.
Description of Deficiency            .
Description of Deficiency            .
Drvuell Vent Structure As a result of the buttering problem identified on the reactor presstre vessel shield wall (NCR's HNP-A-037 and IC'F-A-043), f abricated by Industrial Engineering Works (IEW), the TVA construction forces suspected that the edges of the drywell vent structure f abricated by Lakeside had also been buttered.
Drvuell Vent Structure As a result of the buttering problem identified on the reactor presstre vessel shield wall (NCR's HNP-A-037 and IC'F-A-043), f abricated by Industrial Engineering Works (IEW), the TVA construction forces suspected that the edges of the drywell vent structure f abricated by Lakeside had also been buttered.
Line 31: Line 28:
                                                                                           ., n .
                                                                                           ., n .
AWS code D1.1.                    _
AWS code D1.1.                    _
                                                                                    .
l f        l} g,l    _
l f        l} g,l    _
N          L 1-4-3
N          L 1-4-3 4 66 m' ""''abs'      7 9 0814 0 6 e
                      .
4 66 m' ""''abs'      7 9 0814 0 6 e
                                                                        .


Og a
Og a All segments of the RPV pedestal for PBN unit 1 are onsite. Only a portion        of the RPV pedestal for PBN unit 2 is onsite. NCR PBN-023 has been written to cover the nonconforming condition documented in NCR HNP-A-050. In addition, NCR RNP-B-024 has been written to cover the nonconforming condition documented in NCR HNP-A-050 fot both units at HNP Plant B.                        .
.
.
All segments of the RPV pedestal for PBN unit 1 are onsite. Only a portion        of the RPV pedestal for PBN unit 2 is onsite. NCR PBN-023 has been written to cover the nonconforming condition documented in NCR HNP-A-050. In addition, NCR RNP-B-024 has been written to cover the nonconforming condition documented in NCR HNP-A-050 fot both units at HNP Plant B.                        .
Cause of the Deficiency The cause of the buttering deficiencies can be attributed to a disagreement between Lakeside and the technical engineer (CE) over whether the procurement specifi, cation classifies buttering as a repair or not, and what NDE is required when buttering is performed. Both organizations agree that the buttering that was performed contains sufficient defects to be considered unacceptable per AWS code D1.1.
Cause of the Deficiency The cause of the buttering deficiencies can be attributed to a disagreement between Lakeside and the technical engineer (CE) over whether the procurement specifi, cation classifies buttering as a repair or not, and what NDE is required when buttering is performed. Both organizations agree that the buttering that was performed contains sufficient defects to be considered unacceptable per AWS code D1.1.
The cause of the cracking in the RPV pedestal is still under investigation by TVA and Lakeside. The results of these investigations will be contained in our final report to you on these NCR's.
The cause of the cracking in the RPV pedestal is still under investigation by TVA and Lakeside. The results of these investigations will be contained in our final report to you on these NCR's.
Safety Implications Had the defects in the buttering performed by Lakeside, or the crack in the HTN Al RPV pedestal gone undetected, the structural integrity of the RPV pedestal, and drywell vent structure could be jeopardized under dynamic loading during an earthquake or LOCA. Failure of either structure during such an event has the potential to endanger the health and safety of the public.
Safety Implications Had the defects in the buttering performed by Lakeside, or the crack in the HTN Al RPV pedestal gone undetected, the structural integrity of the RPV pedestal, and drywell vent structure could be jeopardized under dynamic loading during an earthquake or LOCA. Failure of either structure during such an event has the potential to endanger the health and safety of the public.
Corrective Action A. Repairs Hade by Buttering
Corrective Action A. Repairs Hade by Buttering
      *
         . -- For all RPV pedestal and drywell vent structure segments shipped by Lakeside before June 1, 1979 TVA will P:rform the following in accordance with procedures that have been approved by the technical engineer (CE) during the field erection of the strur.02res.
         . -- For all RPV pedestal and drywell vent structure segments shipped by Lakeside before June 1, 1979 TVA will P:rform the following in accordance with procedures that have been approved by the technical engineer (CE) during the field erection of the strur.02res.
: 1. Locate all buttered edges by visual inspection, acid etching, radi-ography (partial or 100 percent), or using the Lakeside assembly records.
: 1. Locate all buttered edges by visual inspection, acid etching, radi-ography (partial or 100 percent), or using the Lakeside assembly records.
Line 62: Line 51:
Spm      &            ,.
Spm      &            ,.
fUUa F    e ~ t , ,_
fUUa F    e ~ t , ,_
_ _
                                                                                      ,
e
e


              - - . .        .  . . - . . _ _ _ . - .
  .-  ,. ,
e o
e o
For all RTV pedestal and drywell vent structure segments not shipped from Lakeside before June 1,1979. Lakeside will perform 100 percent RT inspection and repair, as necessary all buttered welds before the segments are shipped to TVA.                                                                      .
For all RTV pedestal and drywell vent structure segments not shipped from Lakeside before June 1,1979. Lakeside will perform 100 percent RT inspection and repair, as necessary all buttered welds before the segments are shipped to TVA.                                                                      .
B.        Crccks in the Hartsville Unit Al RPV Pedestal Until the cause of the cracking is identified, corrective actions cannot be specified. The corrective actions will be identified in our final report to you on the subject NCR's.
B.        Crccks in the Hartsville Unit Al RPV Pedestal Until the cause of the cracking is identified, corrective actions cannot be specified. The corrective actions will be identified in our final report to you on the subject NCR's.
:
Means Taken to Prevent Recurrence A.        Repairs Made by Buttering on May 2, 1979 GE sent letter number GLB-61 to Lakeside stating GE's (i.e. , the technical engineer's) interpretation of the requirements of the procurement specification with regard to buttering as follows:
Means Taken to Prevent Recurrence A.        Repairs Made by Buttering on May 2, 1979 GE sent letter number GLB-61 to Lakeside stating GE's (i.e. , the technical engineer's) interpretation of the requirements of the procurement specification with regard to buttering as follows:
: 1. Weld edge preparation with weld buildup material (buttering) shall require 100 percent radiography.
: 1. Weld edge preparation with weld buildup material (buttering) shall require 100 percent radiography.
: 2. If the supplier plans to use veld filler metal (buttering) in his fabrication process, a procedure should be submitted to the technical engineer for approval.
: 2. If the supplier plans to use veld filler metal (buttering) in his fabrication process, a procedure should be submitted to the technical engineer for approval.
This action on GE's part should prevent any further misinterpreta'. ion by Lakeside of the procurement specification with regard to NDE and approval of buttering procedures.
This action on GE's part should prevent any further misinterpreta'. ion by Lakeside of the procurement specification with regard to NDE and approval of buttering procedures.
B r- Cracks in the Hartsville Unit Al RPV Pedestal
B r- Cracks in the Hartsville Unit Al RPV Pedestal Until th% cause of the cracking has been determined, actions to prevent recurrence cannw. be specified. The - actions will be discussed in our final report on the subject NCR's.
            .
Until th% cause of the cracking has been determined, actions to prevent recurrence cannw. be specified. The - actions will be discussed in our final report on the subject NCR's.
Our final report on the sub.iect NCR's will be transmitted to you on or before October 1, 1979.
Our final report on the sub.iect NCR's will be transmitted to you on or before October 1, 1979.
m e r, ,  .m    sc    . , ,
m e r, ,  .m    sc    . , ,
* h
h
( .
( .
                                                          ,
f C b t.  (.i li s Lb _ u t i.
f C b t.  (.i li s Lb _ u t i.
79          ,]
79          ,]
_3_
_3_
                                  .
                                                                                                                 .}}
                                                                                                                 .}}

Latest revision as of 01:29, 2 February 2020

First Interim Deficiency Rept Re Faulty Welding by Lakeside Bridge & Steel Co on Drywell Vent Structure & Reactor Pressure Vessel Pedestal.Cracks Observed Near Weld Joints. Investigation & Repairs Underway
ML19242D205
Person / Time
Site: Hartsville, Phipps Bend  Tennessee Valley Authority icon.png
Issue date: 07/05/1979
From:
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML19242D192 List:
References
NCR-HNP-A-038, NCR-HNP-A-050, NCR-HNP-A-38, NCR-HNP-A-50, NCR-HNP-B-024, NCR-HNP-B-24, NCR-PBN-028, NCR-PBN-28, NUDOCS 7908140684
Download: ML19242D205 (3)
v • d • e


Text

A y.

HARTSVILLE AND PHIPPS BEND NUCLEAR PLANTS - ALL UNITS FAULTY WELDING BY LAKESIDE BRIDGE AFD STEEL ON DRYWELL VENT STRUCTURE AND REACTOR PRESSURE VESSEL PEDESTAL 10CFR50.55(e) REPORT NLHBER 1 (INTERIM)

NCR'S HNP-A-038, HNP-A-050, HNP-B-024, AND PBN-028 On June 6,1979, TVA notified NRC-OIE Region II Inspector, W. B. Swan, of a potentially reportable 10CFR50.55(e) condition that has 10CFR Part 21 impli-cations regarding a breakdown in the quality contrcl program at Lakeside Bridge and Steel (Lakeside) . The breakdown involvec the shfpment of the drywell veat structure and the reactor pressure vessel (RPV) pedestal by Lakeside with buttered edges that have been found by TVA forr:es to contain enough porosity, lack of fusion, and slag inclusion to be deemed unacceptable per the American Welding Society (AWS), code D1.1. This is an interim report on the subject NCR's.

Description of Deficiency .

Drvuell Vent Structure As a result of the buttering problem identified on the reactor presstre vessel shield wall (NCR's HNP-A-037 and IC'F-A-043), f abricated by Industrial Engineering Works (IEW), the TVA construction forces suspected that the edges of the drywell vent structure f abricated by Lakeside had also been buttered.

.The results of a spot check of some of the we]d prep edges by radiography revealed that buttering had been performed, and that the buttering contained sufficient defects to be unacceptable by AWS standards. Subsequently, NCR HNP-A-038 was written to document this nonconforming condition.

None of the drywell vent structures for the Phipps Bend Nuclear Plant (PBN) have been shipped from Lakeside; therefore, no NCR wf11 be written for PEN at this time.

Reactor Pressure Vessel Pedestal During field erection of the reactor pressure vessel (RP1) pedesJsi fabricated by Lakeside, a routine veld inspection revealed cracks in en area outside of the zone of the TVA weld. These cracks have a horizontal crientation and appear to be from 1/8-inch to 3/8-inch below the circumferential veld which joins the ring girder to the shell section. Further visual inspectien revealed that sic.ilat cracks are apparent at several other lorntions on the RPV ped-estal. The results of preliminary liquid penetrant examination and acid etching indicate that the cracks are developing al.ng a line where(i.e.,the veador but-apparently fused weld metal to the top edge of the porent metal, tered the veld joint) to meet dimensional requirement >- and/or edge gecmetry.

Some of this buttering radiography tested by TVA centnins aufficient amounts of porosity, lack of fusion, and slag inclusion to be deemed unacceptable under

., n .

AWS code D1.1. _

l f l} g,l _

N L 1-4-3 4 66 m' ""abs' 7 9 0814 0 6 e

Og a All segments of the RPV pedestal for PBN unit 1 are onsite. Only a portion of the RPV pedestal for PBN unit 2 is onsite. NCR PBN-023 has been written to cover the nonconforming condition documented in NCR HNP-A-050. In addition, NCR RNP-B-024 has been written to cover the nonconforming condition documented in NCR HNP-A-050 fot both units at HNP Plant B. .

Cause of the Deficiency The cause of the buttering deficiencies can be attributed to a disagreement between Lakeside and the technical engineer (CE) over whether the procurement specifi, cation classifies buttering as a repair or not, and what NDE is required when buttering is performed. Both organizations agree that the buttering that was performed contains sufficient defects to be considered unacceptable per AWS code D1.1.

The cause of the cracking in the RPV pedestal is still under investigation by TVA and Lakeside. The results of these investigations will be contained in our final report to you on these NCR's.

Safety Implications Had the defects in the buttering performed by Lakeside, or the crack in the HTN Al RPV pedestal gone undetected, the structural integrity of the RPV pedestal, and drywell vent structure could be jeopardized under dynamic loading during an earthquake or LOCA. Failure of either structure during such an event has the potential to endanger the health and safety of the public.

Corrective Action A. Repairs Hade by Buttering

. -- For all RPV pedestal and drywell vent structure segments shipped by Lakeside before June 1, 1979 TVA will P:rform the following in accordance with procedures that have been approved by the technical engineer (CE) during the field erection of the strur.02res.

1. Locate all buttered edges by visual inspection, acid etching, radi-ography (partial or 100 percent), or using the Lakeside assembly records.
2. Perform one hundred percent RT inspection on all buttered edges te locate all defects.
3. Remove defects per procedure.
4. Perform MT or PT inspection to assure sound metal where defects are removed.
5. Repair veld using a procedure approved by t he technical engineer.
6. Perform one hundred percent RT inspection "I the nreas that are repaired.

Steps 1 through 5 will be repeated until so neceptable quality buttering

+

weld is attained.

/o Jr/O ^

7^/

)

Spm & ,.

fUUa F e ~ t , ,_

e

e o

For all RTV pedestal and drywell vent structure segments not shipped from Lakeside before June 1,1979. Lakeside will perform 100 percent RT inspection and repair, as necessary all buttered welds before the segments are shipped to TVA. .

B. Crccks in the Hartsville Unit Al RPV Pedestal Until the cause of the cracking is identified, corrective actions cannot be specified. The corrective actions will be identified in our final report to you on the subject NCR's.

Means Taken to Prevent Recurrence A. Repairs Made by Buttering on May 2, 1979 GE sent letter number GLB-61 to Lakeside stating GE's (i.e. , the technical engineer's) interpretation of the requirements of the procurement specification with regard to buttering as follows:

1. Weld edge preparation with weld buildup material (buttering) shall require 100 percent radiography.
2. If the supplier plans to use veld filler metal (buttering) in his fabrication process, a procedure should be submitted to the technical engineer for approval.

This action on GE's part should prevent any further misinterpreta'. ion by Lakeside of the procurement specification with regard to NDE and approval of buttering procedures.

B r- Cracks in the Hartsville Unit Al RPV Pedestal Until th% cause of the cracking has been determined, actions to prevent recurrence cannw. be specified. The - actions will be discussed in our final report on the subject NCR's.

Our final report on the sub.iect NCR's will be transmitted to you on or before October 1, 1979.

m e r, , .m sc . , ,

h

( .

f C b t. (.i li s Lb _ u t i.

79 ,]

_3_

.

Retrieved from "https://kanterella.com/w/index.php?title=ML19242D205&oldid=2387605"