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3 STONE & WEBSTER MICHIGAN, INC.
P.O. Box 2325. BOSTON. M ASSACHUSETTS O2107 i
United States Nuclea-Regulatory Commission June 2, 1983 Midland Site Resident Inspection Office Route 7 J.O. No.
14358 Midland, MI 48640 Ref. MPF 36 Attention Mr. R. Cook RE: DOCKET NO.
50-329/330 MIDLAND PLANT - UNITS 1 and 2 INDEPENDENT ASSESSMENT OF UNDERPINNING REPORT NO.
36 6
A copy of the Independent Assessment of the Underpinning Weekly Report No. 36 for the period May 22, 1983 thrcugh May 28, 1983, is enclosed with this letter.
Included as attachments, 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 I
(617) 589-2067).
Very truly yours, g STg k$ &
,I A. Stanley Lucks b ' S T~~[,[,t[h
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J.O. no. 14358 Midland Plant 7
Units 1 and 2 i
Independent Assessment of Underpinning
.f Weekly Report No. 36 l
May 22, 1983 through May 28, 1983 Personnel on Site Stone & Webster Michigan, Inc.
W. Kilker' 5/23 - 5/28 1
B. Holsinger 5/23 - 5/26
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P. Barry 5/23 - 5/27 i
Parsons, Brinckerhoff Michigan, Inc.
J. Ratner 5/23 - 5/28 Meetings Attended l
Date Represented Purpose 9
i 5/24 Stone & Webster Daily Meetings through Bechtel
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5/26 Consumers Power Parsons 5/25 Stone & Webster Audit Exit Meeting Bechtel Consumers Power j
U.S. Testing 5/27 Stone & Webster Bi-Weekly soils Bechtel Review Consumers Power i
I Activities Construction -
KC11 Drift: The existing layback areas were formed in preparation for back-filling with grout.
Pier ES: The bell excavation and steel plates, frame, and strut support system for the bell was completed and installed. Once started, the belling and support installation continued virtually uninterrupted. The clay till remained stable during excavating _snd virtually no groundwater seepage entered the bell area.
Minor voids behind the steel plating were grouted through prefitted holes in the plating.. The steel plates were installed in stages as the bell excavation
- progressed, limiting exposure of the bell-area soils.
Pier E8 Drift: 'The slope layback area at the west end of the' pier E8' drift was formed in preparation for filling with grout.
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14358 4
Midland Plant
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Units 1 and 2 Independent Assessment of Underpinning 2
Pier E10: The bell excavation was completed and supported with steel plates and struts. Bottom mat anc bell area reinforcing steel were installed and 1
f concrete placed to El. 572, near the top of the bell as indicated on the drawings.
KC2 Drift: Form work for grouting the existing slope layback was completed.
j Pier W8: The shaft area was completed to founding grade, El. 505. Minor j
seepage continued to enter the excavation at the fill / natural soil interface.
Tne slope layback at the east end of the pier drift was formed in preparation for grout placement, t
Pier W10: The bell area was excavated and supported by steel plates and struts.
Grouting of void spaces behind the sheeting is in progress. Minor seepage I
continued to enter excavation from the higher elevation zones described in Weekly Reports #34 and 35.
Pier E/W9: Non-routine rejacking of these piers was performed to assess the effect of the turbine building underpinning support system on the adjacent portions of the EPA structure.
Quality Control, Documentation and Records:
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Reviewed 8 welding and 15 stud weldina inspection reports for accuracy and completeness, 2.
Assessed MPQAD follow-up on the finding of an internal audit on U.S. Testing.
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Reviewed ASME requirements for disassembly testing of Fox-Howlett couplers.
Observations j
Construction - The excavation and support of the bell are'as in piers E/W8 and E/W10 was performed in accordance with the project documents. The Contractor
. plans to proceed with bell construction in piers E/W8 on a nominal round-the -
clock basis until completion. The Assessment Team feels this action will sig-nificantly contribute to the timely completion of the piers in accordance with good underpinning practice.
Quality Control,' Documentation and Records - With the exception of one repcrt (identified in NIR #11 issued May 26, 1983).the Assessment Team review indicated the welding and stud welding QC inspection reports were complete, accurate -
and had been properly reviewed. NIR #11 was issued when the Assessment Team
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found that in one case the final visual inspection of a repair had not been performed prior to closing the inspection report. Upon notification, MPQAD 1 assisted in determining the cause of the finding, opened a new inspection report-to do the required. inspection, retrained the inspectors involved. and issued clarified instructions to prevent a reoccurrence. Based on these actions.taken
.by MPQAD the NIR was issued as closed on May 27, 1983 4
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14358 I
Midland Plant Units 1 and 2 Independent Assessment of Underpinning 3 i
l After attending the exit meeting on the audit of U.S. Testing, the Assessment l
Team raised a question concerning MPQAD's follow-up to the certification j-finding. MPQAD replied that after the internal U.S. Testing review of the t
certifications, the MPQAD auditors reviewed the valid certifications to i
determine compliance. The Assessment Team concurred that this follow-up action taken was sufficient.
l The Assessment Team review of the ASME requirements on coupler disassembly inspections determined that the inspection is clearly detailed in a 1980 addendum to ASME Section III, Division 2 and that if the Contractor proposes to wave this inspection a change in the SAR would likely be required.
Design Work Packages - An overview of six design work packages was performed by the Assessment Team. After an initial review, the Assessment Team sub-mitted cor.ments and questions to the Contractor's Constructability Grou-for i
resolution. All comments were addressed and questions resolved and in the opinion of the Assessment Team the following work packages meet the necessary accuracy and adequacy requirements:
Excavation and temporary backfill for Service Water pipe, BWST Foundation Repair, Exploratory Excavation for ILRT Ductbank, SWPS Dewatering System Installation, SWPS Soldier Beam Installation, and E/W 13/14 Piers and Zone Excavations.
NonConformance Identification Reports __
Status of previous issues:
(NIR numbers no longer listed have been closed-out.)
NIR No.
Description Date j
(Opened)
(Closed) 5 Concrete Mix 2/10/83 5/25/83 Qualification i
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Lagging Spacers 3/21/83 7
Backpacking Material 4/5/93 in Wet areas-Pier W11 8
Load Transfer Methed-4/5/83 ology - Pier E12 9
Release of Pier W9 4/13/83 5/25/83 for Load Transfer 10 Verification of 4/21/83 5/25/83.
Vibrator Frequency 11 Base Metal Repair 5/26/83 5/27/83 Inspection Report J
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Notes of Daily Meeting Independent Assessment of Underpinning Midland Plant L'nita 1 & 2 Consumers Power Company May 23, 1983 No meeting was held on this date.
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Notes of Daily Meeting Independent Assessment of Underpinning Midland Plant Units 1 & 2 i
Consumers Power Company i
Held at the Midland Site Location Midland, Michigan May 24, 1983 Present For:
Consumers Power Bechtel MPOAD Stone & Webster G. Murray J. Gaydos R. Sevo B. Holsinger J. Fisher P. Barry E. Cviki W. Kilker Parsons 1
J. Ratner j
Purpose This meeting is held each day to discuss items regarding the Independent Soils Assessment at the Midland Plant, Units 1 & 2.
f Discussion i
Item 1 - Status of on-going work.
J. Fisher reported that the drift to KC2 pier should resume shortly now that a change request on laybacks on.this drift has been resolved. The drift to pier KC11 is still held pending resolution of a change request to modify a reshore member. Pier E8 belling may start today while pier W8 bell work may commence near the end of the week. The Contractor is prepared to perform the belling operations on a continuous basis to support the concept of minimizing risk of bell failure.
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Item 2 - Status of PQCI and certification with respect to layback filling.
R. Sevo stated that it is likely the existing certifications and PQCI's will be adequate to control the quality aspects of the layback filling. Due to the similarity of the proposed work to existing grout installation techniques the proper inspection status can be achieved by reciprocity from the existing documents.
Item 3 - Status of NIRs.
W. Kilker reported that the Assessment Team has received replies on NIRs #5,* 9 and 10.
Item 4 - Resolution of welding concerns.
J. Fisher said that based on the meeting of May_20 fabrication tolerances will be delineated on vendor _ drawings.
Item 5 - Rejacking of piers E/W9 P. Barry asked why piers E/W9 were rejacked on May 23.
E. Cviki said neither 1
the-pier nor building settlement initiated the procedure but rather it was done to determine if the turbine pier load would have any effect on settlement of the close portion of the EPA as monitored by a nearby benchmark.
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Consumers Power Company Held at the Midland Site Location Midland, Michigan May 24, 1983 l
Page 2 4
l Item 6 - Status of Fox-Howlett coupler disassembly NCR.
G. Murray asked about the NCR on Fox-Howlett couplers.
R. Sevo said that the I
specification had required a disassembly examination of one of every 100 couplers but that the construction procedure had not included that requirement. Resolution will likely be to require the examination.
Item 7 - Pier W10 water problems.
s W. Kilker asked for a summary of the pier W10 water related problems.
J. Fisher said that there was the problem of movement of granular fill into the pier excavation above El. 585. The resulting void was subsequently grouted. In the vicinity of El. 575 a substantial quantity of water piped into the excavation hypothetically through a silt zone between piers 9 and 10.
The small void was layered with gravel & grout and spiling installed to prevent collapse of any material into the upcoming bell excavation.
I Item 8 - Closure of NCRs and FCRs.
t B. Holsinger stated that the May 20 meeting of all concerned parties was in the view of the Assessment Team quite successful - numerous outstanding FCRs and NCRs were resolved or dispositioned. The Assessment Team would axpect a similar degree of diligence be maintained at all times in the future to prevent having to operate in the crisis atmosphere of last week.
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Notes of Daily Meeting Independent Assessment of Underpinning Midland Plant Units 1 & 2 g
Consumers Power Company
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Held at the Midland Site Location Midland, Michigan 1
May 25, 1983 Present For:
Consumers Power Bechtel MPQAD Stone & Webster i
G. Murray J. Fisher J. Shah W. Kilker l
E. Cviki P. Barry
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M. Blendy B. Holsinger
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J. Kelleher N. Swanberg i
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1 J. Ratner i
I Purpose This meeting is held each day to discuss items regarding the Independent Soils Assessment at the Midland Plant, Units 1 & 2.
Discussion i
Item 1 - Layback fill schedule.
J. Fisher reported that the concreting of the existing laybacks is scheduled for May 27.
f Item 2 - Reanalysis of Temporary Support System.
N. Swanberg gave a brief description of progress on reanalysis of the temporary 4
.f underpinning support without the laybacks.
' Item 3 - Construction Aid Procedure.
G. Murs.y will verify status of construction aid procedure sign-off.
Item 4 - Status of NIRs 5, 9 and 10.
P. Barry reported 3 NIRs (Nos. 5, 9, & 10) have been closed out by the Assessment Team.
Item 5 - Fox-Fowlett Disassembly Requirements.
J. Fisher said the Engineering disposition of the installed Fox-Howlett couplers g
was to accept as-is based on the 100 percent QC inspection performed. The dis-l assembly requirement for future installation'is under review.
Item 6 - E/W8 pier Bell Work Schedule.
J. Fisher said the work once initiated on the E/W8 pier bells will proceed on an around the clock basis.
8 Item 7 - Access Shaft Wale Installation Detail.
P. Barry and E. Cviki will visit the buttress access shafts to resolve a question on the work package submittal on access shaft lower wale installations.
t Item 8 - SWPS Soldier Pile Backfilling.
P. Barry asked if lean mix flyash' for SWPS soldier pile encasements requires a.
j mix qualification as per ACI.
N. Swanberg replied that this material is a backfill and therefore not subject -to qualification by ACI standards.
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Notes of Daily Meeting Independent Assessment of Underpinning Midland Plant Units 1 & 2 g
Consumers Power Company e
l Held at the Midland Site Location Midland. Michigan-May 25, 1983 (Page 2 continued)
Item 9 - Anchor Bolt Field Test Program ~.
I J. Kelleher reported that field tests on anchor bolts will be performed May 27.
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The test program is to provide data for upcoming discussion on re-evaluating the required torque values for anchor bolts.
Item 10 - Work Schedule on SWPS.
J. Ratner questioned why work on the SWPS seems to have virtually stopped.
J. Fisher said that procedure changes are needed to designate 5 of the 6 recently drilled holes as piezometers rather than wells. Additional SWPS work needs NRC approval prior to release.
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' Items requiring resolution i
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Notes of Daily Meeting i
Independent Assessment of Underpinning
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Midland Plant Units 1 & 2 j
consumers Power Company Held at the Midland Site Location Midland, Michigan May 26, 1983 Present For:
Consumers-Power Beethel MPQAD Stone & Webster j
G. Murray J. Fisher R. Sevo W. Kilker R. Weiland E. Cviki P. Barry M. Blendy B. Holsinger N. Swanberg D. Lavelle J. Gaydos Parsons j
l J. Ratner Purpose This meeting is held each day to discuss items regarding the Independent Soils Assessment at the Midland Plant, Units 1 & 2.
Discussion s
' Item 1 - Potential Effect of Generic QA Programmatic change on Issue of Future
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PQCI's.
R. Sevo stated that QC may have a problem supporting the layback grouting this week due to a MPQAD commitment to establish certain new overall plant procedures.
l-In the mestime QA/QC Soils maybe impacted.
R. Sevo will verify.
' Item 2 - Responses to NIR #6 & 7.
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E. Cvikl'provided responses to the QARs generated as a result of NIR #6 and 7.
W. Kilker will review and respond.
Item 3 - Fox-Howlett Disassembly Inspection Requirements.
J. Fisher reported that the procedure will be modified to include the disassembly inspection of one outor every 100 units on the upcoming rebar installations.
Engineering will in the meantime pursue the long-term resolution of this finding.
Item 4 - Pier E10 completion.
J. Fisher reported a delay in the release of lower leveling plate anchor bolts may result in a seperate concrete placement for the bell area.
Item 5 - Comment on Work Schedule.
J. Fisher reported that June 6 is being considered for a start date on increasing -
the underpinning' work schedule via the rolling 4-10 plan.
.W. Kilker stated that clearly the Assessment Team has no involvement in the decision or ' official opinion on this decision. However, the Contractor should realize that the
- Assessme'nt Team may produce a critical evaluation of the upcoming effort if this increased work schedule simply means that certain work activities are completed quicker only to bg delayed longer before being allowed to continue on subsequent activities.
' Item 6
.U.S. Testing Audit Findings.
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.G. Murray reported that CPCo had met with the NRC on-site to discuss the findings.
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Notes of Daily Meeting
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Independent Assessment of Underpinning Midland Plant Units 1 & 2 g
Consumers Power Company Held at the Midland Site Location Midland, Michigan May 26, 1983 Page 2 B. Holsinger asked if based on the nature of the audit findings, MPCAD would deem it necessary to participate with U.S. Testing on any follow-up investigation.
R. Sevo will advise.
Item 7 - Grout Type.
R. Wieland stated that the manufactures's representative for masterflow grout mix has been contacted concerning the use of the material as a dry-pack or flowable grout. The topic is scheduled for discussion in the Soil's Weekly i
Review meeting.
' Item 8 - Pier Bell Bond Breaker Material.
l J. Ratner questioned why on the drawings certain pier bond breaker material l
is designated as a certain type while on others it is designated simply as bond breaker.
N. Swanberg will resolve.
Item 9 - Access Shaft Inspection.
j J. Ratner asked if there was a long-term routine inspection plan for the access shaft lagging. J. Fisher replied that the field personnel now perform periodic checks of backpacking which involves a close-up view of the lagging. A long-term inspection plan, however, would not be considered until the lagging had been in-place for at least a couple of years.
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- Items require resolution i
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D Notes of Daily Meeting.
Independent Assessment of Underpinning Midland Plant Unita 1..& 2
!l Consumers Power Company May 27, 1983 j
No meeting was held on this date.
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