ML20070S289
| ML20070S289 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 12/20/1982 |
| From: | Lucks A STONE & WEBSTER, INC. |
| To: | Cook R NRC |
| Shared Package | |
| ML20070S237 | List: |
| References | |
| MFP-13, NUDOCS 8302040341 | |
| Download: ML20070S289 (9) | |
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STONE 6 WEBSTER ENGINEERING CORPORATION 245 SUMMER STREET, BCSTON M ASS ACHUSETTS rA ADDRE*$ ALL CORitESPONDENCE 10 F.C BOR 232E. B OST C N. t. a s s c2107 vb L TELEA DA 000*
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Was>'ACTC% fC United Stated Nuclear Regulatory Commission December 20, 1982 Midland Site Resident Inspection Office Ecute 7 J.O.
No. 14358 Midland, MI 48640 Ref. MFP 13 Attention Mr. E. Cook RE: DOCKET NO.
50-329/330 Midland Flant - UNITS 1 AND 2 INDEFENDENT ASSESSMENT OF AUXILI ARY BUILDING UNDERPINNING REPOET NO.
13 A copy of the Inde-pendent Assessment of the Auxiliary Building Under-pinning L'eekly Et part No.13 for the period December 12 through December 16,.1962, is enelcred with this letter.
Included, as an attachment, are the ninutes of the daily meetings held during the week between ' embers of the Assererent Team and Site Engineering, Constructicn and Quality Arsurarrie persor.nti during the week.
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If you have any quarticas with respect to this report please contact me, 4
at (617) SE9-2007.
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1435E Midland i'l a nt Un;*r 1 and 2 Independent Assessment Auxiliary Building Underpinning Weekly Report No.
13 Decenter 12 through December 18, 1982 Fersonnel on Site Stone & Webster Enginaering Corporation (SWEC)
B. Holsinger 12/15 - 12/18 W. Kilker 12/13 12/17 L. Rouen 12/13 - 12/16 A. Scott 12/13 - 12/16 Parsons, Brinckerhoff Quade and Douglas (PEOD)
J. Ratner 12/13 - 12/17 Meetings Attended Date Represented Purpose 12/13 Stone & Webster Daily Meeting through Bechtel 12/17 Consumers Fower Parscns (12-16/12-17) 12/17 Stone & Webster Weekly Soils Eeview Bechtel Mergentime Consumers Power Activities Construction - Assessment Team Members observed the soil excavation and lagging installation in the pier W 12 access pit commencing at El 609 and extending down to approximate El 600.
The excavated soils varied from a brewr. sand in
,the upper 2 ft. - 3 ft. to a mixture of gray sancy clay and brown sand in the bottom 6 ft. - 7 ft.
A minor quantity of perched watcr was encountered in the upper portion.cf the excavction. A concrete " mud mat" extending out from the turbine building wall was removed by chipping and 2 electrical grounding cables encountered in the pit arca -were rerouted to the perimeter of the lagged pit.
The installed lagging consisted of 8 levels of 4" x 12" wood planking separated by 2" spacers.
Granular excavated material was backpacked where required and
, excelsior was placed between the lagging boards.
A wooden yoke was placed at the face of the access drift to the pier followed by removal of the lagging from that face.
Within a few inches of excavating into the drift, a formed vertical face of concrete was encountered, encompassing nearly the entire face of the drift.
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IA358 l'idland Plant Units 1 and 2 Independent Assessment Auxiliary Buildi g Underpinning Unsing a hydraulic rock splitter to dislodge the concrete, the contractor advanced approximately 1.5 ft.
Quality Control, Documentation, and Records - Surveillances were made of the fellowing item and activities:
1.
Insurance and use of work permits, drill permits for concrete removal, work authorization for steel fabrication and confined entry safety permits.
2.
Update riots of the settlement monitoring data.
3 Use of controlled copies and latest approved revisions of relevant pro-cedures and drawings.
4 Training of OC inspectors and performance testing in excavation / lagging and steel fabrication.
5.
Survey documentation including independent survey records.
Observations Conrtruction - The workmanship involved in construction of the access pit meets the requirements of the project documents.
The contractor limited the excavating to lest than 18 inches below the previously installed level of lagging.
Care was taken in shaving the vertical faces of soil to insure a good fit for the lagging.
Jacks were used to temporarily hold the lagging as each level was installed.
Eackpacking was done, where required, as the excavation progressed.
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For each of the upper levels of lagging, excelsior was placed prior to excavating for the next level. The Assessment Team recommended to the contractor that ur.icre groundwater is seeping into the area, the excelsior placement be delayed tc awhat to allow better access to the soil behind.the lagging, in case the
. cil t ended to unravel as the excavation progressed.
Observation of the sub-segacnt work indicated that the soil was remaining in place.
Caality Control, Documentation, and Records - The Assessment Team found that the contractor had obtained the required work and safety permits.
Records of the previous week's settlement monitoring data had been updated and plotted.
Fecorde were verified showing that a locatic: survey had been done and checked by an independent surveyor.
3 J. O. NO.-
34358 Midland Plant Units l'and 2 Independent Assessment l
Auxiliary Building Underpinning The' surveillance indicated that the drawing and procedures being used by the contractor in_the field were " controlled" copies that had been fully signed-out and were the latest revisions containing all change notices.
I The team was satisfied with the OC training being conducted.
Quality assur-I i
ance engineers'were performing full-time inspection of all activities -
in this case the excavating / lagging and some shop modification to a steel drift set.
In addition to the actual inspection work, the OA engineer was f
training a Quality Control Inspector on the respective procedure.
The j
"on site" training culminated in performance evaluations of the OC inspectors.
Non-Conformance Identification Reports NIR #2 - Closed as a result of a response by CPCo on December 8,1982 not-l i
ifying the team of the updating of the drawings at the MPOAD document con-trol stations.
Subsequently, a team member verified the incorporat ion of the previously missing drawings.
Status of previous issues:
(NIR numbers no longer listed have been closed-out during previous weeks.)
NIR NO.
Description Date (Open)
(Closed )
2 Dodument Control Surveillance 10/29/82 12/14/82 3
Coupler Testing 12/14/82
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INDEFENDEh7 ASSESS _MEhT TEAM MEETIN3 WITH BECITIEL Date: NDecer.ber 13, 1962 Attendees:
Lechtel Stone / Webster MPQAD CPCo
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J. Fisher W. Kilker L. Kettren G. Marray E. Cviki A. Scott L. Rouen 1.
J. Fisher reported that the work peralit was signed and work was underway.
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ICEPEDENT ASSESSEEh? TEAM MEETING WITH EECHTEL Dste:
December ik, 1982 Attendees:
bechtel Stone / Webster MPQAD CPCo J. Fisher W. Kilker L. Kettren G. Murray E. Cviki A. Scott L. Rouen 1.
J. Fisher reported that work on the access pit stopped on Monday PM after a s:ud mat" was encountered protruding 6" - 12" out from the turbine building well into the pit. A concrete renoval permit has been issued to allow removal of the sat today.
2.
G. Murray advised that additional monitoring gauges are prrysed for the FIVP and that conduit runs should proceed into the access shaft as soor.
as permission free the NRC is obtained.
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INDEFENDENT ASSESSMENT TIJJ'. MEL7IN3 WITH EECHTEL
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Date:
December 15, 1982 Attendees:
Bechtel Stone / Webster MPQAD CPCo J. Fisher W. Kilker L. Kettren G. Murray E. Cviki 1.
J. Ratner stated that, in his view, the initial bachpecking was relying too much on the placement of excelsior but that the methodalogy had now been modified to increase the use of excavated material to fill in behind the lagging.
2.
W. Kilker confirmed that to date (EL605) the work in the view of the essessment team has been performed accord'inE to the plans &
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IhT)EPENDENT ASSESSE NT TEAM MEUrlNG VITE BECHTEL Date:
December 16, 1982 Attendees:
_Bechtel Stone / Webster MPQAD CPCo
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J. Fisher W. Kilker L. Kettren G. Murray E. Cviki A. Scott R. Wheeler Parsons J. Ratner 1.
W. Kilker advised that the assessment team had no technical concerns about the work performed to date.
A. Scott inquired as to the state of the steel set needed to start the drift to pier W 12.
2.
J. Fisher described need to 2ndify first steel set because of turbine building met extending to El 607.3 ft. not El 608 ft. as enticipated.
3.
J. Fieber reminded QA/QC of the FIVP load verification requirement.
h.
R. Wheeler said that the QA training of the QC personnel in " performance" on Pier W 12 vill serve to qualify sufficient personnel for picr E 12.
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IEEPEEEh? ASSESSMEh7 TEAM MEETING WITH BECHTEL Date:
December 17, 1982 Attendees:
Bechtel Stone / Webster MPQAD CPCo R. Bradforn W. Kilker L. Kettren K. Razdan E. Cviki A. Scott Persons J. Ratner 1.
W. K11ker described the team activities - evaluation of QA/QC inspection within the pit and at the fabrication yard, surveillance of the construction activities. The team was satisfied with the activities performed.
2.
L. Kettren reported that QC ves coverin5 the fabrication change of the first steel set.
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