ML20072M134
| ML20072M134 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 03/23/1983 |
| From: | Lucks A STONE & WEBSTER, INC. |
| To: | Cook R NRC |
| Shared Package | |
| ML20072M111 | List: |
| References | |
| MPF-26, NUDOCS 8307140349 | |
| Download: ML20072M134 (9) | |
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O Midland Plant Units 1 and 2 Independent Assessment Auxiliary Building Underpinning Weekly Report No. 26 March 13,1983 through March 19, 1983 Personnel on Site Stone & Webster Michigan, Inc.
W. Kilker 3/13 - 3/14 P. Barry 3/15 - 3/19 Parsons, Brinckerhoff Michigan, Inc.
V. Madill 3/14 - 3/18 Meetings Attended Date Represented Purpose 3/14 Stone & Webster Daily Meetings j
through Bechtel 3/18 Consumers Power Parsons 3/14,16,18 Stone & Webster Bechtel Meetings Bechtel on Welding Issues 3/18 Stone & Webster Weekly Soils Review Bechtel Consumers Power Activities Construction - Pier W12: On the morning of March 13 1983 the acceptance criteria of.01 inch deflection maximum in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> was attained, the shims were tightened, and the pressure in the jacks released.
For the next 3 days 110% of the specified load was rejacked into the pier, the shims tightened, and the jacks depressurized.
After this rejacking effort, shims were-checked for tightness each shift.
Pier W9:
Pier excavation including belling was completed from El. 582 to the subgrade. All lagging and bell supports were installed. The mud-mat was placed after approval'of the subgrade by the RGE. The material excavated was natural gray clay. No significant groundwater seepage entered the excavation.
The natural gray clay in the bell experienced some unravelling.
Additional steel plates were installed to support the areas subject to unravelling.
Pier W11:
The excavation for the drift to W11 was completed. The second drift set was installed but an NCR on the testing of dry pack grout for the abandoned j
expansion anchors holes has prevent torquing of the expansion achors. The third
' drift set and associated lagging has not been installed. Temporary breast boards have been installed in place of the lagging.
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14358
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Midland Plant Units 1 and 2 Independent Assessment i
Auxiliary Building Underpinning 2
I Pier E12:
The jackstand and telltales were completed and installed. The load I
transfer was initiated on the morning of March 18, 1983 Within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> the proof test load of 1250 kips (125% of the specified load) was applied through l
two 565 ton jacks and accepted with pier deflection less that.01 inch for a l
continuous 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> period. Then the load was reduced to 110% of specified load.
The pier had moved downward approximately 0.19 inches with respect to the turbine
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mat while the bottom of the pier had moved 0.03 inches with respect the top of the pier.
As of March 19, 1983 the 110% load had been maintained for approximately 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
The pier deflection criteria of less than.01 inches for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />
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had not yet been satisfied.
Total pier settlement, after 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />, was approximately j
0.23 inches. The actual movement of the building as measured by a benchmark app-roximately 55 ft. away was less than 0.003 inches.
t Pier Ell: Once the proof loading for pier E12 was accepted, excavation and support s
of the N-S access drift to pier E11 was initiated and completed to a distance of approximately 3 ft. under the turbine building. The excavated material consists of approximately 1 ft. of unreinforced concrete, a thin layer of sand, and 7 ft.
of clay fill. One steel set was installed in the drift.
Pier E9:
The Construction activities and progress on this pier are similiar to j
those at pier W9.
The material excavated from the pier was natural gray clay.
The remaining lagging and bell supports were installed. The lean mix concrete mud-mat was placed after approval of the subgrade by the RGE. More unravelling 3
j occurred in this bell than in pier W9 The unravelled areas were covered with additional steel plates and the voids behind the plates were backpacked with j
Quality Control, Documentation and Records:
(1).
Verified the completion of the combines calibration record for pier E12.
(2).
Verified that the jack system record, pressure schedule, and combined j
calibration record were available at pier E12 during the jacking cperation.
(3).
Reviewed the preliminary concrete trial mix data for the new concrete mix for underpinning piers.
I Observations i
Construction: The load transfer to pier W12, which is complete, and to E12, which is on-going, has been accomplished according to project documents. Pier performance during proof jacking and load transfer has been satisfactory.
The excavation of pier E/W9 was done essentially in parallel with E9 remaining slightly ahead of W9.
Material fabrication kept pace with the excavation with only a slight delay occurring as a result of fabrication problems. This is an improvement in comparison with pier E/W12. Soll conditions in the bells were similiar.
The unravelling in E9 was greater than W9 and both bells were provided with additional support.
Although the unravelling was not considered major, it appears to be a continuing process and the contractor decided to place concrete in the bell section as early as possible.
t The drift excavation for pier E/W11 made little progress this week. Difficulties locating expansion anchors because of rebar interferences requires an FCR. Torquing of the expansion anchors is delayed pending resolution of an NCR on dry pack grout testing.
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14358 7~3 Midland Plant
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Units 1 and 2 Independent Assessment Auxiliary Building Underpinning 3
Quality Control, Documentation and Records - The quality related procedures ver-iried for the load transfer were properly implemented.
The 3 day and 7 day strength breaks and the corresponding concrete tests were reviewed.
The data will not be complete until the 14 day and 28 day strength are available. However, the 7 day strength are almost high enough to approve the entire range of water cement ratios tested for the mixes. The 14 day strength should be sufficient to approve the new concrete mixes.
Future assessment will be needed when the mixes are approved.
Overview of Design Work Packages We have reviewed a schedule for the preparation of the design work packages for the Auxiliary Building and the Service Water Pump Structure.
This schedule will be used to coordinate our overview with Consumers Power Company submittals of design work packages.
Non-Conformance Identification Reports Status of previous issues:
(NIR numbers on longer listed have been closed-out.)
NIR NO.
Description Dat Opened)
Closed) 5 Concrete Mix 2/10/83 Qualification
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Project Engine &F Project Manager
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O INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL Date:
March 14, 1983 Attendees:
Bechtel Stone / Webster MPQAD CPCo J. Fisher W. K11ker R. Visser G. Murray J. Gaydos E. Cviki R. Weight J. Kelleher 1.
J. Fisher introduced R. Weight and J. Kelleher representing the Direct Hire and Constructability groups.
2.
J. Fisher reported W12 pier settlement criteria will likely be satisfied today so shims can be tightened.
3 J. Fisher reported week-end rab. shop work went well and that all lagging for E/W9 is complete and E/W11 lagging is started.
Ring set for E/W9 is also nearly ready.
4.
J. Fisher said the welding NCR on the E12 jackstand had not been resolved.
Once resolved 2 shifts will be needed to finish the fabrication. Earliest load transfer is now March 17, 1983 5.
W. Kilker advised the group that the NRC had requested the Team assessment expand to include all underpinning of safety related structures.
6.
W. Kilker asked if any underpinning work on safety related structures other than the Auxiliary Building or SWPS is planned for the near future.
G. Murray said he did not envision any real soon.
7.
J. Fisher advised that today there is a " kick-off" meeting on the re-solution of welding non-conformance.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL Date: March 15, 1983 Attendees:
Bechtel Stone / Webster MPOAD CPCo R. Visser G. Murra.y J. Fisher J. Gaydos E. Cviki J. Kelleher Parsons V. Madill 1.
J. Fisher stated that the.01 inch settlement criteria for a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period was met at 9:30 AM March 14, 1983 (Total settlement was i" in 72 hrs.) t'or pier W12.
It is anticipated that the load test at pier E12 maybe started Thursday March 17, 1983 The welding for the jacking stand is being completed.
2.
The review of the draft copy of the administrative guideline FIU-1.100 is still being reviewed. The issue is still open with a meeting on same being pursued by FSO.
3 A meeting on welding codes and procedures is to be hold at 3:30 PM today.
A meeting is also being held at 10:00 AM at Mergentime's to review shop layout requirements.
4.
This writer requested the name of the Subcontractor who will do the well installation for Spencer, White & Prentis, Inc. and the approximate start up time.
J. Fisher stated that Loughney Dewatering Company will be the well Subcontractor and that they have been given OK to mobilize Monday March 21, 1983 They will work 6 day-10 hour shifts.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL Date: March 16, 1983 Attendees:
Bechtel Stone & Webster MP0AD CPCo J. Fisher P. Barry R. Visser G. Murray J. Gaydos E. Cviki J. Kelleher L. Weight Parsons V. Madill 1.
The load transfer for pier E12 is scheduled for tommorrow morning March 17, 1983 2.
Spencer, White & Prentis Subcontractor, Loughney Dewatering should be ready to start work at the SWPS on March 23, 1983 However, the availability of certified QC inspection may require starting later.
3 Work on the drift to pier W11 is delayed pending closing an NCR on dry pack grout material.
4 In order to close out NIR #5, the C-Sc concrete mix in question has to be deleted from the job and the NCR written by QA on the same subject has to be closed out.
Approval of the new concrete mix will not be sufficient to close out this NIR.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL Date: March 17, 1983 Attendees:
Bechtel Stone / Webster MPQAD CPCo G. Murray J. Fisher P. Barry i
E. Cvikl J. Kelleher 4
Parsons V. Madill t
1.
Load transfer on pier E12 is scheduled today. A copy of the combine i
calibration record for pier E12 was provided, f
2.
J. Fisher provided a copy of the daily construction schedule for the l
probing, core drilling and test holes for the SWPS.
3 A copy of the engineering response to NCR No. M0143043 concerning the approval of mix C-Sc was provided.
The mix approval has been withdrawn.
NIR #5 will be closed.
I 4.
P. Barry questioned that since the new mix with the 5 inch slump appears l,
to give 4000 psi in 3 days, is it necessary to use the mix with the high range water reducer (HRWR).
Bechtel wishes to use the HRWR since this mix improves constructability.
5
- v. Madill questioned if it was intended for the laybacks on the drifts for W9, W11, and W12 to intersect. This intersection removes soil from beneath the turbine building mat fora'long distance and reduces the load on drift set to approximately 5 ft. of soil only. Bechtel responded that many discussions concerning the laybacks have been held and no change is l-anticipated, and that the turbine building has been checked for this l
condition.
l 6.
The drift sets for pier W11 access drift are different from W12 and W9 drifts because they will be incorporated into a bulk head later.
7.
Pier E9 has progressed to the bottom of the pier and the mud-mat with embedment has been placed. Pier W9-has progressed to the bottom of pier.
I 8.
E. Cvikl stated that in the daily report notes for Novermber 22, 1982 in Weekly Report No. 10 by the Assessment Team it was noted that J. Fisher dir-ected E.Cviki to arrange a meeting with QA.
E. Cvikl wishes to make it clear that J. Fisher from FSO cannot direct E. Cvikl from Resident Engineering.
No such line of command exist. This was a request not a direction.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BEHCTEL Date: March 18, 1983 Attendees:
Bechtel Stone / Webster MPQAD CPCo J. Fisher P. Barry R. Visser E. Cviki J. Gaydos 1.
During load transfer of pier E12, Mergentime intends to hold the proof load (125% of specified load) approximately 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> after the acceptance criteria of.01 inch deflection in one hour.
The reason for this is to attempt to reduce the time required for main-taining active jacking on the pier. Bechtel will investigate if this is contrary to their procedurcs.
2.
The dry pack grout for the unused holes for expansion bolts in drift W11 was released. The NCR only applied to U.S. Testing Lab's testing of grout. The dry pack is placed and cured but the bolts cannot be torqued until the grout cubes have been tested.
3 The working mat for the subgrade of pier W9 was placed with grout rather than lean mix concrete.
Plywood was placed over the grout supported by angles that are part of the embedment to support the bell.
P. Barry questioned whether this satisfys the criteria to stay off the concrete until the strength reach 300 psi.
Bechtel will investigate.
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STONE & WEBSTER MICHIGAN, INC.
P.O. Box 2325. Boston. M AssAcHusETTs O2107 4
United States Nuclear Regulatory Commission Maren 23, 1983 i
j Midland Site Resident Inspection Office Route 7 J.O. No.
14358 Midland, MI 48640 Ref. MPF 26 j
Attention Mr. R. Cook RE:
DOCKET NO.
50-329/330 MIDLAND PLANT - UNITS 1 and 2 4
INDEPENDENT ASSESSMENT OF AUXILIARY BUILDING UNDERPINNING j
REPORT NO. 26 l
A copy of the Independent Assessment of the Auxiliary Building Underpinning Weekly Report No. 26 for the period March 13, 1983 through March 19, 1983, is enclosed with this letter.
Included as attachments, are the minutes of l
the daily meetings held during the week between members of the Assessment Team i
and Site Engineering, Construction, and Quality Assurance personnel.
i If you have any questions with respect to this report, please contact me at (617) 589-2067.
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Very truly yours, AF%W A. Stanley Lucks Project Manager Enclosures ASL/ka i
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