ML20083Q541
| ML20083Q541 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 01/18/1983 |
| From: | Lucks A STONE & WEBSTER ENGINEERING CORP. |
| To: | Cook R NRC |
| Shared Package | |
| ML20083Q415 | List: |
| References | |
| NUDOCS 8302250431 | |
| Download: ML20083Q541 (10) | |
Text
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STONE 6 WEBSTETt ENGINEERING CORPORATION 245 SUMMER STREET. BOSTON. M ASSACHUSETTS ADDRESS ALL CORRF ePONDENCE TO P.O. SOX 2325. SOSTON. M ASS. 02107 W U. TELEX 94 0001 C NSTRWCTION CM MILL. N J
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United States Nuclear Regulatory Commission January 1S, 1983 Midland Site Resident Inspection Office Route 7 J.O.
NO.
14358 Midland, MI 48640 Ref. MFP 17 Attention Mr. R. Cook RE: DOCKET NO.
50-329/330 Midland Plant - UNITS 1 and 2 INDEPENDENT ASSESSMENT OF AUXILIARY BUILDING UNDERPINNING REPORT NO.
17 A copy of the Independent Assessment of the Auxiliary Building Under-pinning Weekly Report No. 17 for the period January 9, 1983 through January 15, 1983, is enclosed with this letter.
Included, as an attach-ment, are the minutes of the daily meetings held during the week between members of the Assessment Team and Site Engineering, Construction and Quality Assurance personnel.
If you have any questions with respect to this report, please contact me at (617) 589-2067 v
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14358 Midland Plant Units 1 and 2 Independent Assessment Auxiliary Building Underpinning Weekly Report No. 17 January 9, 1983 through January 15, 1983 Personnel on Site Stone & Webster Engineering Corporation (SWEC)
W. Kilker 1/10 - 1/15 L. Rouen 1/10 - 1/14 A. Scott 1/10 - 1/15 S. Lucks 1/10 - 1/11 Parsons, Brinckerhoff, Quade and Douglas (PBQD)
J. Ratner 1/10 - 1/14 Meetings Attended Date Represented _
Purpose Stone & Webste'r Daily Meetings 1/10 through Bechtel 1/14 Consumers Power Parsons 1/14 Stone & Webster Weekly Soils Review Bechtel Consumers Power Activites Construction - Pier W12 was excavated and lagged to E1 581.
The excavated material consisted of a mixture of brown sand and clay fill above E1 586 and natural gray clay below E1586. Perched groundwater entered the excavation near E1 586 at a rate of 50-60 gallons / day.
The water was encountered on January 12 and as of January 15, the rate of flow had remained relatively constant. The water was controlled by sump pumping from the bottom of the excavation during periods when the hole was not being advanced. During tre excavating operation the. water was simply removed as part of the excavated material. Because the seeping water was creating " muddy" working conditions in the bottom of the pier excavation, the subcontractor devised a plastic pipe trough. attached to the lagging near El 585 to divert the water directly to a collection barrel rather than allowing the wate'r to drain to and' disturb the elsy at the bottom.
The excavation was alternately excavated approximately 18 inches and lagged throughout the fill material. - Below the elevation of the natural clay, the excavation was advanced approximately 31 ft. prior to initiating lagging placement.
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14358 Midland Plant Units 1 and 2 Independent Assessment Auxiliary Building Underpinning 2
Ba,ckpacking of the lagging was done after the installation of each set in'the fill and after installation of each spreader sit (every 4th set) in the natural clay. The backpacking material was either the excavated brown fine sand fill or an imported medium grained sand.
The degree of backpacking required was minor since the excavated surfaces were being trimmed smooth and no collasping of the soil was occurring.
Exclesior was not used except near the southwest corner of the excavation, between E1588 and 585 where the seepage of water between the lagging had begun to wash out a very minor quantity of fine sand. When the collection trough was installed a portion of the excelsior was removed and a cement grout packed into the lagging separation zone directly above the trough.
On January 14, a 4-6 inch thick concrete mud-mat was installed in the access pit and drift excavation of pier W12.
The access drift of pier E12 was advanced to completion - approximately 9 ft.
under the outside edge of the turbine building. The excavation was mainly in lean mix concrete except for a wedge of clay fill along the west side. The concrete at the top of the drift was chipped away to the 'evel of the turbine mat structural concrete, as determined by examination of core samplea. Along
. the west side of the drift, the " stress relief','. wedge was excavated in,the l
clay fill just below the roof level. Clay fill soil was also encountered in the lower right corner of the face of the drift. This material was cut back on a flat slope commencing at the bottom of the face. No groundwater entered the drift excavation, although minor perched water continued to enter the sump in the adjacent access pit.
Quality Control, Documentation and Records -
1.
Reviewed the qualification of the QC welding inspector per-
, forming the inspection of the pier W12 channel bracing.
2.
Verified the proper implementation of the probing procedure for measuring groundwater at pier W12.
4 3
Reviewed the qualification records of the concrete batchplant inspector.
4.
Witnessed the performance evaluation of a QC inspector by a Quality Assurance Engineer on the W12 drift excavation inspection
' plan.
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14358 Midland Plant Units 1 and 2 Independent Assessment Auxiliary Building UnderpinninE 3
5.
Reviewed the completed QC Inspection Reports for the W12 pier excavation to date.
6.
Reviewed two QC Inspection. Reports on the fabrication of steel lagging.
7.
Reviewed the QA "over-inspection" reports for the W12 drift and pier excavation for the last week of December and first 10 days of January.
8.
Verified the development of strength vs time curves for the con-crete mix designated for the W12 access pit and drift mud-mat.
9.
Observed and inspecte'd the mock-ups in the Poseyville storage arsa that will be used to aid in the performance evaluation of QC inspectors. The mock-upinsta11ations include an in-ground lagged pier excavati'on with reinforcing bars in-place, an above-ground pier bell with bracing and bottom reinforcing steel, and concrete anchor and anchor drill hole installations.
10.
Witnessed the performance evaluation at the mock-up area of a QC inspector by a QA engineer on the pier lagging procedure.
Observations Construction - The Team determined that the construction practices employed to advance the W12 pier excavation and the E12 access drift excavation were in compliance with the project documents.
On the W12 pier excavation, care was taken to accurately trim the soil, to maintain the overall verticality of the shaft, to control and remove perched water seepage and to minimize the movement of fines and fine sand into the excavation.by the use of excelsior packing where required.
The Team did observe that backpacking was difficult due to the narrow 1 inch spacing between lagging sets. The inspection of the effectiveness of the backpacking is also difficult. However, due to the care being exercised in trimming the excavation prior to installation of the lagging, this does not represent a problem.
-On the E12 access drift, the contractor did a thorough investigation to determine the junction of the turbine mat structural concrete with mud-mat concrete.
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14358 Midland Plant Units 1 and 2 Independent Assessment Auxiliary Building Underpinning 4
Quality Control. Documentation and Records - The Team surveillance in-dicated the MPQAD organization has adequately performed and documented the inspections, training, qualifications and overview assessments.
In the opinion of the Assessment Team, the concept of partial traiaing of the QC personnel at the mock-up area, is worthwhile. It not only results in a more efficient training schedule, but permits the QA examiner to test the ability of the QC inspector to detect " built-in" errors.
The Team advised MPQAD that although the Inspection Reports produced to date by the field personnel are in good order, the final sign-off of these documents by supervisory personnel should be accomplished more efficiently.
Non-Conformance Identification Reports Status of previous issues:
(NIR numbers no longer listed have been closed-out during previous weeks.)
NIR No.
Description Date (Opened)
(Closed) 3 Coupler Testing 12/2/82 Temperature 4
Welding Qualifi-12/29/82 cation Procedure
- A reply has been received and is being reviewed.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL Date: January 10, 1983 Attendees:
Bechtel Stone / Webster MPQAD CPCo J. Fisher W. Kilker L. Kettren G. Murray E. Cviki A. Scott A. Lucks Parsons J. Ratner 1.
L. Kettren reported that a list of shop drawings requiring Engineering approval has been compiled.
Copies of the list were distributed.
2.
W. Kilker said that J. Ratner discussed the backpacking of the west wall of the access drift lagging with M. Lewis (FSO) on January 8, 1983 L
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL Date: January 11, 1983 Attend'es:
Bechtel Stone / Webster MPQAD CPCo e
J. Fisher A. Scott D. Oliver G. Murray E. Cvik1 J. Ratner D. Lavelle L. Rouen 1.
R. Oliver reported that MPQAD comment: on completed access pit and drift installations are included on their documentation reports.
D. Lavelle said construction will conduct a review for any possible improvements.
2.
J. Fisher stated that MIOSHA had some observation based on their recent inspection of the construction improve barriers around access pits, modify hoist cable and protect floodlights.
3 The second shift for the West Pier will commence once bell level is reached - tentatively January 17, 1983 4.
E. Cviki said Engineering is preparing to answer the Assessment Team NIR #3 on the testing temperature of couplers.
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7 INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL D te:
January 12, 1983 Attendees:
Bechtel Stone / Webster MP0AD CPCo J. Fisher L. Rouen R. Sevo R. Wieland E. Cviki A. Scott D. Lavelle W. Kilker Parsons J. Ratner 1.
E. Cviki and J. Fisher described the conversation engineering had with NRC with respect to backpacking. Backpacking as stipulated in the procedures will continue to be adhered to.
2.
R. Sevo reported that QA has established mock-ups of a lagged excavatation, a pier bell and concrete bolt installation in order to conduct QC performance evaluation on certain of the Quality Control Plans.
3 D. Lavelle said engineering is conducting a review of drawings, specifications -and procedures for piers E-W 9 and 11 to assure agreement between documents.
4.
R. Wieland will verify requirements on resuscitators for inspection after work hours.
EL INDEPENDENT ASSESSMENT TEAM MEETING WITH B 13, 1983 Date: January CPCo MPOAD Stone / Webster Bechtel G. Murray Attendees:
L. Kettren L. Rouen J. Fisher A. Scott E. Cviki W. Kilker Parsons _
J. Ratner f January 12, 1983 W. Kilker and J. Fatner described the observation oinspecting the degree concerning the difficulty of backpacking andthe pier lagging.
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of backpacking with the present spacer size onThere wa
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E. Cviki reported that engineering is preparing the re 2.
the team NIR #3 W12 would im-i L. Rouen questioned if the mud-mat placement in p er hannel.
J. Fisher pact the NRC written on welding of the bracing crepl mat wouldn't come 3
h up to the level of the channel.
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F-e INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL Date: January 14, 1983 Attendees:
Bechtel Stone / Webster MPQAD CPCo J. Fisher L. Rouen G. Murray E. Cviki A. Scott W. Kilker Parsons J. Ratner 1.
Mud-mat in W12 access drift will be placed at 5:00 PM today.
2.
J. Fisher advised that pier excavation will begin to advance 42 inches in the clay prior to lagging installation.
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