ML20084Q041
| ML20084Q041 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 05/10/1984 |
| From: | Lucks A STONE & WEBSTER, INC. |
| To: | Cook NRC |
| References | |
| MPF-85, NUDOCS 8405210074 | |
| Download: ML20084Q041 (18) | |
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SiF F i_ l o A May 10, 1984 United States Nuclear Regulatory Concission Midla-d Site Resident Office Route 7 J.O. No. 14358 Midland, Michigan Ref. MPF 85 Attention: Mr. Cook DOCKET NO. 50-3E9/330 MIDLAND PLANT UNITS 1 & 2 INDEPENDDrf ASSESSMENT OF UNDERPINNING REPORT NO. 85 A copy of the Independent Assessment of Underpinning Weekly Report No. 85 for the period of April 29, 1984 through May 4, 1984 is enclosed with this letter. Included as attachments are the minutes of the daily iceetings 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.
A. Stanley Lucks Project Manager Enclosures ASL/bd cc:
JJHarrisonT(eno)',:US'NRC! Glen ~Ellyn:IL7 Grace Dow Mortorial Library (enc)
DQuarnte (enc) CP Co Midland (site)
Jttoney (enc) CP Co Jackson JMeisenheitter (enc) MPQAD Midland (site) l gg14 N 8405210074 840510 I
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J.0. No. 14358~
Midland Plant L.-
Units 1 & 2.
Independent Assessment of Underpinning Weekly Report No. 85 April 29, 1984 through May 4, 1984 Personnel on Site Stone & Webster Michigan, Inc.
P. Majeski
-4/29 - 5/1
.D. Benvie 4/30 - 5/4 D. Zito 4/30 - 5/4 W.-Kilker 5/3 - 5/5 L. Rouen 5/1 - 5/5 Parsons Brinckerhoff Michigan, Inc.
J. Oliveira 4/29 - 5/1 B. Metros 5/2 - 5/5 Meetings Attended Date-Represented Purpose 4/30 - 5/4 Stone & Webster Daily Assessitent Bechtel Team Meeting Consurters Power Parsons Underpinning and Remedial Soils - Construction Pier ES: Excavation of the bell area was initiated. One short side and half of one long side were cortpleted. The belled sections are cortpletely supported with steel plating. Minor unter seepage continues to enter the bell area from above. Excavation and support of the containrtent ' drop pit was cortpleted. The area between the pier and the containrtent drop ~ pit was formed in preparation for the concrete working slab installation.
Pier E17:
The center portion'of the enlarged straight shaft pier was excavated and the studicat installed.
Piers CT 3/10: The drop pit excavations and supports were cortpleted to El. 594 ft.
Pier W5:
Excavation and support of the bell area was cortpleted. The drop pit excavation at the containetent was also cortpleted and the forrtwork placed for the concrete working slab between the pier and drop pit.
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J.O. No. 14358 2
~ Midland Plant Units.1 & 2 Independent Assessment of Underpinning Pier W17: No further Lctivity was performed pending fabrication of lagging materials to support an enlarged straight shafted pier.
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Kc5 Drift: The finger drift to the pier was completed.
Access Shaft Level "C" Wales:
Fit-up and welding of the wales continued in both shafts.
SWPS:
Installation of the upper level wales and struts continued on the north and west sides. Excavation and lagging was completed to El. 626 along the east side and easternmost 20 ft of the north side.
Extension of the bentonite seal between the SWPS and the circulating water intake structure was completed. The base of the seal was extended to pene-trate through the rip rap layer on the front side of these structures and prevent leakage at tne pint between the structures.
BWSTs: Concrete was placed along the north section of the ring beam ex-tension at Unit 1.
Reinforcing steel and fontwork installation continued at Unit 2.
Cathodic Protection: Trench excavation work continued.
Assessrtent Team Observations - Construction During the past week, the construction effort for the auxiliary building underpinning concentrated on the excavation of five piers and drifting to two other piers. The Assessrtent Team observed the bell excavations for piers E/W5, concrete rtudmat placertent for piers E5 and E17, soils stabilization grouting for CT 3/10 and drifting to pier Kc5.
Minor water seepage was encountered during belling of the E5 pier. In order to preclude sloughing of the in-place soil, the Contractor was careful to expose only small areas of the bell prior to the installation of plate supports and bracing. Although soil conditions for pier W5 appeared stable, the Contractor elected to plate and brace the entire bell. The Assessment Team believes these measures undertaken to ensure the stability of the E/WS bells were prudent. Placertent of the grout rtudrtat for the E5 and E17 piers was in accordance with the proceedures. Prior to grout placement, minor seepage in pier E5 was diverted frort the founding soils. Duration of grout mixing was tirted to ensure thorough reixing of the grout constituents as specified by the design. Grout placements was continuous, concluding the satisfactory installation of the mudrtats for piers E5 and E17.
The results of the sods stabilization grouting perronted in piers CT 3/10 drop pits indicate that this installation was effective. The rtedium to fine grained sand observed on the excavated walls for these drop pits was certented throughout, enabling the craftsrten to Itaintain a vertical excavation face, thus facilitating lagging installation.
J 0. No. 14358 3
Midland Plant Units 1 & 2 Independent Assessment of Underpinning The finger drift to pier Kc5 was observed by the Assessment Team. The Contractor maintained a close tolerance on the horizontal limits of the excavation. Lagging installation and backpacking associated with this drift conformed with the applicable procedures.
Installation of the upper lateral support system for the soldier pile wall along the east side of the SWPS was completed, allowing excavation of the access shaft to proceed. The Assessment Team observed excavation and lagging installations associated with lowering of the access shaft. The Contractor was careful to maintain the excavation well within the design limits, minimizing the amount of backpacking needed to ensure bearing between the lagging and in-situ soil. Placement of steel lagging was precise. The craftsmen carefully aligned the lagging during installation, ensuring lagging spacing requirements were met. The Contractor began using welded studs this week to expedite lagging installation. Clip angles which fasten the steel lagging to the soldier piles are attached to the lagging with the threaded studs instead of fillet welds. The clip angles are then secured to the soldier piles. The lagging surfaces receiving the welded studs were dry and clean.
During installation of studs, the welding gun was held in place until the weld metal at the base of the stud had solidified. Welded stud bolts were than torqued to the appropriate tension, securing the clip angles into place.
Along the north side of the SWPS, installation of the soldier pile wall upper lateral support system continued. The Assessment Team observed full penetration welding of the horizontal shims for the upper level waler. The wal, soldier piles and shim plates were brushed to bare metal in preparation for the welds.
The resulting quality of the full penetration welds, considering the size and extent of the effort involved with this type of weld, is indicative of a high level of craftsmanship.
Based on the observed quality of the on-going work, the Assessment Team con-cludes that construction of the SWPS access shaft is satisfactory.
Placement of concrete for the north section of the Unit 1 BWST ring beam addition was observed by the Assessment Team.
During placement, the Contractor effectively used a concrete boom truck to deposit concrete at preplanned locations, thereby minimizing the need for lateral movement of the concrete.
Concrete lift thicknesses and vibration of lifts was in accordance with the procedures. Proper curing of the surfaces completed the satisfactory placement of concrete for the north segment of the BWST Unit 1 ring beam addition.
Assessment Team Observation QA/QC The Assessment Team closed NIR 22. This NIR concerned document control deficiencies identified at the Resident Engineers controlled document station for the rettedial soils work. The document deficiencies noted in NIR 22 have been corrected by Resident Engineering. MPQAD and the Assessment Team independ-ently verified correction of the deficiencies. Additionally, a sample audit by
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J.0, No. 14358 4
Midland Plant Units l'& 2
- =
Independent Assessment of Underpinning MPQAD indicated that Resident Engineering is adaquately maintaining their documents. As part of the long term corrective action, a system will be implemented whereby the Resident Engineers controlled documents will be-come reference documents. The Assessment Team will overview this change ever from controlled documents to a reference system. A computerized register of design documents including change docurrents will serve as the mear.s of control for the reference docurtents. The user will consult the listing and review the pertinent infornation in the reference files for a particular docuttent as necessary to perform a given task. The Assessrtent Team believes that irtplettentation of this systert will provide the required assurance that the Resident Engineers are using the latest design docurrent revisions.
The activities of US Testing for concrete placertent at the BWST Unit 1 ring beam addition were observed during preplacercent and in-process testing. All required concrete testing was perfortted in accordance with ASTM procedures.
The Assessrtent Team attended MPQAD training classes on the SWPS plate load test and on excavation of Q soils areas. Both of these classes were judged
- to be acceptable in content and presentation.
Work Activity Packages No work activity packages were overviewed or active during the past week.
Nonconformance Identification Reports The following Nonconformance Reports (NIRs) rertain open or have been closed during the week.
NIR No.
Description Status (Opened) (Closed) 22 Resident Engineering Docurtent Control 2/21/84 4/30/84 25 Cortpressive Strength 3/30/84 Testing of Concrete Cylinders Open Items Iterts discussed during rteetings are categorized as follows:
OPEN ITEM - An item for which action is required. The item will rertain open until the required action has been taken. Tracking is required.
CLOSED ITEM - An item usually brought forward by the Assessrtent' Team that is discussed and adequately responded to. No tracking is required.
INFORMATION ITEM - An item brought forward to provide general background infontation regarding work, such as work status or an upcorting design change.
No tracking is required.
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- J.O. No'. 14358 5
Midland Plant Units 1 & 2
^
Independent' Assesse:ent of Underpinning i
1 OPINION ITEM - An opinion or suggestion given by the Assessment Team ex-pressing an alternate construction or quality assurance technique. The opinion or suggestion is given as a possible alternate that may facilitate an' operation.
- CIDSES ITEM - XX-XX - This notation identifies an action that closes a previously identified open item. Tracking of the open items stops.
The following listing of all Open iterts from the Daily meeting notes with Bechtel and.the text of the Weekly Reports. Carry-Over iterts from past weeks which have been Closed this week are also listed.
Item No.
Description Closure 64-10 Trend Analysis open 71-17 Certputerized Civil Open Drawing Register 74-21 US Testing Corrective Open Action 79-26 Upper Leveling Plates Open 79-23 SWPS Backpacking Open Material 79-34 SWPS Backpacking Open Placement 81-21 BOP Construction Open Verification of Soils Work 82-3 Surface Voids in Grout 85-12 82-9 Trend Analysis Update Open 84'-12' Diesel Fuel Oil Lines 85-6 84-13 SWPS Phase II Cofferdarc 85-7 84-20 Design Drawing Requirertents Open for BWST Ring Beam Addition
~ 84-21 Repair of BWST Ring Beam-85-18 Cracks
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J.O. NO. 14358 6
Midland Plant-
. Units 1 & 2 Independent Assessment of Underpinning 84 BWST Concrete Reinforcing 85-19 Steel-v.
'84-23
- BWST Corrosion Protection 85-20 and Waterproofing 84 Repair of Concrete 85-13 Surface Irtperfections of the BWSTs 85-5 SWPS North Wall Concrete Open
-Surface-85-29 Auxiliary Building Access Open-Shaft Grout Shirts
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5 Project Engiheer
/ Project Manager c.
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Notes of Daily Meeting L
Independent Assessment of Underpinning
~
Midland Plant, Units 1 & 2
~ Consumers Power Cortpany Held at Midland Site Midland, Michigan April 30, 1984 Present For:
Consurters Power Stone & Webster Parsons-Brinckerhoff MPAQD
-G. Wrray.
TI Benvie J. Oliviera J. McMaster R. Wheeler D. Zito R. Sevo R. Wieland P. & jeski Bechtel J. Fisher J. Kelleher E. Cviki PURPOSE ~
This meeting is held each day to discuss items regarding the Independent Soils Assessitent at the Midland Plant, Units 1 & 2.
DISCUSSION' Status Iterts Item 85-1 Auxiliary Building Underpinning Activities Installation of the steel collar support frames was cortpleted for. piers CT 2/11 allowing drifting to piers CT 3/10 to corratence.
Excavation of the drop pits at the reactor containctent'for installation of the E/W5 grillage support _colurtas is in progress.
' Excavation of piers E/W5_ progressed to the top of. the bell and installation
- of the ring bearts was certpleted.
Excavation of the E17 pier has begun using the enlarged pier configuration.
Installation of reshore rtertbers to allow finger drifting to piers KC 5/9 is in progress.
(INFORMATION ITEM)
Item 85-2 SWPS Underpinning Activities r
J. Fisher reported that excavation below the first level wales has begun along the east side of the SWPS.
(INFORMATION-ITEM)
Item 85-3 -- Surface Voids in Grout J. Kelleher provided the Assessrrent Team with copies of FCRs addressing repair of rtinor surface voids 1in the grout for leveling plates, anchor bolts and grouted-in bolts.
(Item 82-3 rertains OPEN) (INFORMATION ITEM)
l Notes'of Daily Meeting sIndependent Assessment of Und:rpinning Midland Plant, Unita-1 & 2
~
l Consumers Power: Company Held at Midland Site
- Midland,~ Michigan April 30, 1984
- New Iterts Item 85-4 One Time Deviation FCRs P. Majeski asked how a document user determines if the work described in a one time deviation FCR, which has been incorporated onto a document by reference, is cortplete.
J. Fisher responded that FCRs incorporated by reference contain a brief description of the FCR requirertents. If the FCR is applicable to the document user's work, a copy of the FCR is available for the user to deterrcine if the work has been cortpleted. (CLOSED ITEM)
Itert 85-5 SWPS North Wall Concrete Surface
- D. Zito discussed the existing concrete surface on the SWPS north wall. It was noted that a section of the wall approxirtately 3 ft long and 1.5 ft high located 26 ft from the SWPS northeast corner exhibited honeycertbing. Also, several font tie holes were observed which have not been repaired. The Assessment Team asked what will be done to repair these conditions.
J. Fisher will respond. (OPEN ITEM)
Response Iterts Item 85-6 Diesel Fuel Oil Lines J. Fisher responded to the Assessrtent Team question concerning the plans for work on the diesel fuel oil lines. It is planned to excavate and expose the diesel fuel oil-lines for inspection. All portions of the lines which are considered acceptable will be left in place. The rertaining portions will be rertoved and replaced with new lines.
(CLOSES ITEM 84-12)
Item 85-7 SWPS Phase II Cofferdam J. Fisher discussed design changes which will be irtplertented for the SWPS Phase II cofferdam. These changes are as follows:
A.
Wood lagging will be used for the soldier pile wall in those areas where the lagging span is 8 ft or less.
B.
Soldier piles will be installed full depth in sheeted pits. Previously, the design called for the use of drilling for installation of that portion of soldier pile excavations belon the existing utilities.
C.
Based on available subsurface inforrtation, excavation for the Phase IIA portion of the cofferdam will not go below El. 610 ft. This will eliminate the lower
' bracing at E1. 612.5 ft.
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Notes of Daily Meeting
-- Independent'Assessrtent of Und;rpinning
. Midland Plant, Units 1 & 2
-.Consurters Power Corepany Held at Midland Site Nidland, Michigan April 30, 1984
.D.
The top 8 ft of excavation for the Phase IIB portion of the cofferdam will be sloped IH:IV. 'Ihis will eliminate the lower bracing at El. 612.5' in portions of the Phase IIB cofferdam.
(CLOSES ITEM 84-13)
' Item 85 8 - NIR 22 - Resident Engineering Docurtent Control
- The Assessrtent Team has. cortpleted an overview of corrective action taken to address deficiencies.with the Resident Engineers controlled docurrents
- noted in the NIR 22. Docuttent deficiencies have been corrected by Resident Engineering. Additionally, a sartple audit by MPQAD indicates that Resident Engineering is reaintaining their docurtents adaquetely. Based on the sartple audit results and a review by the Assessment Team that the noted docurtent deficiencies were corrected, NIR 22 is closed.
(INFORMATION ITEM) 9
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-i Notes cf Daily Meeting-l TMm=adent Assessment of.Und:rpinning V-Midland Planti Units.1 & 2 Constners Power Company -
-HelditMidlandSite f
~Midlandi' Michigan
- %y 1/1984,,
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Present'For:
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. Consumers Power
. Stone & Webster Parsons-Brinckerhoff.
.MPQAD Y
. G. - 1%:rray D. Benvie-J. Oliviera M ster D. Zito, R. Sevo P. Majeski Bechte1 E
J. Fisher s-J. Kelleher E. Cviki i
i
' PURPOSE This meeting is held each day to discuss iteits regarding the Independent Soils f
. Assessment'at the Midland Plant, Units 1 & 2.
j
- DISCUSSION i
- Status' Items Item 85-9
' Auxiliary Building Underpinning Activities Excavation and soils stabilization grouting is in progress for the CT 3/10 drop i
pits.
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' Excavation for.-the 'E/WS piers has proceeded into-the pier bell area.
Item 85 Trend. Analysis.
- J. McMaster' stated that MPQAD will give a presentation on 5-4-84 detailing their plans for modifying the NCR trend analysis program that is-currently
_ being used. (Item 64-10 remains OPEN)
(INFORMATION ITEM) f
- Item 85-11
. SWPS Backpacking Material-
.J. Fisher discussed the. backpacking material for the SWPS soldier pile wall.
[
. The contractor plans to mix cement with the present backpacking to aid in l
maintaining the backpacking-in-clace'once it is installed.
(Item 79-28 re-
- mains OPEN)
(INFORMATION ITEM)-
New' Items No.new items were discussed.
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Notes cf Daily Meeting
' Independent Assessment cf Underpinning Midland plant, Units 1 & 2 Consumers Power Company Held at Midland Site Midland, Michigan m y 1, 1984-Response Items Item 85-12 Surface Voids in Grout he Assessment Team has reviewed FCRs issued to address repair of minor
' surface voids in grout for leveling plates, anchor bolts and grouted anchors.
Based on a review of these FCRs, the Assessment Teams believes that require-ments for repair of minor grout surface imperfections are adequately addressed.
his item is closed. (CLOSES ITEM 82-3)
Item 85 Repair of Concrete Surface Imperfections of the BWSTs J. Fisher responded to the Assessment Team question concerning timely repair of surface imperfectionsfor' the BWST ring beam addition. Repair of.nurface imperfections for the BWST ring beam additions had been delayed due to the stop work order and because of scheduling changes. It is planned, as the work activity allows, to repair these surface imperfections before the affected area-is covered up.
(CLOSES ITEM 84-24)
Note 3 cf Daily Meeting Independent Asse sment of Und:;rpinning Midland Plant, Units 1 & 2
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Consumers Power Company-Held at Midland Site Midland, Michigan
.May 2, 1984 Present For:
Consurters Power Bechtel-MPQAD Stone & Webster C. Murray J. Fisher J. McMaster D. Benvie
'J. Schaub J. Kelleher R. Sevo D. Zito E. Cvikl L'. Rouen B. Brandes-Parsons Brinckerhoff B. Metros PURPOSE 1his meeting is held each day to discuss items regarding the Independent Soils Assessrtent at the Midland Plant, Units 1 & 2.
DISCUSSION' Status Items Item 85 Auxiliary Building Underpinning Activities Excavation of the E5 pier to founding grade.and placertent of the concrete rtudmat was certpleted.
Excavation of the E17 pier middle shaft was cortpleted.
Installation of rein-forcing steel is expected to begin today.
Excavation of the drop pit for installation of the E5 grillage support colurtns at j
the reactor containme.n was cortpleted.-
Excavation of the finger drift to pier Kc5 has begun.
(INFORMATION ITEM)
Item 85-15 SWPS Underpinning Activities-
_J. Fisher stated that the FCR allowing the use of wood lagging in areas where the lagging span is less than 8ft will be issued today.- ibbular steel lagging will still be used where_the lagging span exceeds 8 ft.
(INFORMATION ITEM)
New Itercs Item 85 BWST Concrete Placettent J. Fisher reported that concrete placertent is scheduled today for the BWST Unit 1 ring beam addition.. (INFORMATION ITFaM) t e -.
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- Not:c cf Daily Meeting Ind: pend:nt As;essment of Underpinning Midland Plant,l Units 1 & 2 Consumers Power Company Held at Midland Site Midlard, Michigan May 2, 1984 It'em 85-17 Upper leveling Plates
- J. Kelleher provided the Assessment Team with a copy of the Field Engineers #
report surutarizing the results of the welding demonstration conducted on 4/20/84.
This demonstration was performed to evaluate the extent of warping that would result with the use of a smaller weld for the upper leveling and bearing plate assembly.
(INFORMATION ITEM)
(Item 84-3 remains OPEN)
Itert 85 Repair of BWST Ring Beam Cracks E. Cvikl responded to the Assessrtent Team question as to whether the cracks on the underside of the valve pit top slabs at the BWSTs are to be repaired.
He stated that the cracks have been evaluated and~1t has been determined that these cracks do not require repair.
(CLOSES ITEM 84-21)
Item'85 BWST Concrete Reinforcing St. eel J. Fisher responded to the Assessrtent Team question concerning exposure of the
. Unit No. 1,BWST reinforcing steel to water and dirt. The low area on the west side of the Unit -1 BWST where this condition had been occurring has been c1'eaned up. ' Additionally, pumps have been reactivated in this low area to remove
. water that had collected. It was also noted that the discharge of water puttped thru the valve pit into this low area has been stopped.
D. Zito stated that he has been observing the contractors efforts to clean up and dewater the noted area and is satisfied with the results of the cleanup.
(CLOSES ITEM 84-22)
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Item 85 BWST Corrosion Protection and Waterproofing E. Cvikl responded to the Assessment Team question concerning corrosion protection
- and waterproofing requirertents for the BWSTs. He stated that there was not a concern with the channel sections contributing to corrosion of the reinforcing 1
steel.
Jihe channel sections which support the reinforcing cage do not corte in contact
.with the insitu soil because they rest on a concrete rtudrtat. The F ~ ence of the reudrcat prevents the insitu soil. from corroding the channel sa and
-the reinforcing cage. In response to Assessrtent Team concerns assot Ot d with the'deltaged waterstop, E. Cvikl stated. that a sealant'will be applied to con-crete once 'it is placed in the vicinity of the waterstop. This' sealant'will effectively serve the purpose that the waterstop was designed for.. Baaed on this response the Assessrtent Team concludes that corrosion protection and
. waterproofing of the BWSTs is satisfactory.
(CLOSES ITEM 84-23)
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Notes cf Daily Meeting Independent Asse:sitent'of Underpinning Midland Plant,. Units 1 & 2 Consurcers Power Cortpany Held at Midland Site Midland, Michigan
.May 3. 1984-n Present For:
'Consulters Power.
Bechtel MPQAD Stone & Webster G. M2rray.
J. Fisher J. McMaster E Zito J. Kelleher R. Sevo.
E. Cvikl Parsons-Brinckerhoff B. Metros
' ' PURPOSE
'Ihis meeting is-held each day to discuss iterns regarding the Independent Soils Assessitent at the Midland Plant, Units 1 & 2.
DISCUSSION Status Iterts
~ Itert 85-21 Auxiliary Building Underpinning Activities Excavation of the W5 pier shaft and placertent of the concrete rtudrtat was
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cortpleted.. Excavation of the S/W5 pier bells corrztenced.
' Drop pit excavation at the reactor containroent for the W5 grillage support
-.colurtns was cortpleted.
- Excavation of the finger drift to pier Kc8 has started.
Installation of reinforcing steel is in progress for the E17 pier.'
Pier _CT 1 was rejacked for load verification.
(INFORMATION ITEM)
-Item 85-22 ~
SWPS Underpinning Activities
J;' Fisher reported that revisions to the roethod of shinsting the interface between the wales and the soldier piles is presently being reviewed. A revised.
.' design consisting of full-penetration weld connections to a leveling plate span-ning the interface between the wales'and piles _is being considered.
(INFORMATION-
~ ITEM)
LItem 85-23 -. BWST Concrete The first concrete placertent for. the Unit 1 BWST ring beam addition was cortpleted.
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-Notes cf Daily Meeting Ind: pend:nt Assessment of Und:rpinning Midland Plant, Units 1 & 2
' Consurters Power Cortpany Held at Midland Site Midland, Michigan M y 3. 1984 1
Item 85-24 Upper leveling Plates B. Metros reported that he had reviewed the Bechtel Field Engineers' report
. on.the welding ' den:onstration on plate warpage. Mr. Metros stated that end
-restraining the plates during cooldown and the use of a srtaller continuous weld roay not effectively reduce warpage. he use of several shorter welds.
roay be effective in controlling warpage.
(Item 79-26 rertains OPEN) (OPINION ITEM)-
New Iterts Item 85-25 Weekly Report #84 he text of Weekly Report #84 was reviewed.
It was deterrtined that all open iterts had been previously identified.
It was clarified in the rteeting that the
. portion of the report text describing over excavation at pier W17 which re-
-quired grouting was a result of traterial sloughing and not worlatanship.
(INFORMATION ITEM)
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- Response -Iterns No~ response items were addressed.
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Notes of Daily Meeting
. Independent-Asse:sment of Und;rpinning
.i.
Midland Plant, Units 1-& 2 Tonsumers Power Company
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' Held at Midland Site Midland, Michigan m y 4, 1984 Present For:
Consumers Power Bechtel MPQAD Stone & Webster None-J. Fisher J. Mc& ster W. Kilker J. Kelleher R. Sevo L. Rouen E. Cvikl D. Benvie M. Blendy Parsons Brinckerhoff B. Metros PURPOSE This meeting is held each day to discuss items regarding the Independent Soils Assessment at the Midland Plant, Units 1 & 2.
DISCUSSION Status Items Item 85-26 Auxiliary Building Underpinning Activitics Pier CT 12 was rejacked for load verification.
l Installation of bell bracing is in progress for pier WS.
The concrete mudmat at founding grade for the E17 middle pier was placed.
(INFORMATION ITEM)
Item 85 Trend Analysis J. McMaster discussed MPQAD's' plans regarding NCR trending. The present manual' system for trend analysis of NCRs will remain in effect. To complement the present' trending, an in-house tracking system which MPQAD has used on an in-formal basis for the past few months will be' instituted as a monthly activity to. identify development of NCR trends associated with all remedial soils activities. This tracking activity will evaluate the number of NCRs per number of inspection reports vs time for a specific construction activity (i.e., ex-cavation, grouting, expansion anchors, welding associated with fabrication, welding associated with erection, etc.). The first monthly report presenting the results of the NCR tracking activity will be. issued in mid-&y. The Assess-ment Team will' review the report when it is issued.
(Item 64-10 remains OPEN)
.(INFORMATION ITEM)
Item 85-28 SWPS Backpacking Method B. Metros discussed backpacking in process on the east side of the SWPS. He stated that additional effort is needed in tamping the backpacking to enhance it's effectiviness. -(Item 79-34 remains OPEN)
(OPINION ITEM) g
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Notes of Daily' Meeting.
. Independent. Ass:ssment of Undtrpinning
.. 3.^..
Midland Plant,' Units 1 & 2
- Consumers Power Company
. Held at Midland Site Midland, Michigan May 4,11984 New Items '
Item 85-29 Auxiliary Building Access Shaft Grout Shims D.:Benvie discussed the use of grout shims at the interface of the wales and a.few of the piers in the auxiliary building access shafts.
It was noted that
-concern'had previously been raised over the use of grout shims for the lateral support system at the SWPS. He asked if there was a concern with the use of similar grout shims for the access shaft lateral support system.
J. Fisher will respond.
(OPEN ITD1)
- Item 85 Pier W17 Alternate Design
. J. Fisher reported that the alternate. pier design used for pier E17 will be J
- implettented for pier W17. Soil conditions dictated that the alternate design which consists of an enlarged straight shafted pier be used in place of
- a. belled pier.
(INFORMATION ITEM)
- Response Items
. No. response items were addressed.
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