ML20072M189

Independent Assessment of Auxiliary Bldg Underpinning Weekly Rept 31, for 830417-23

ML20072M189
Person / Time
Site:	Midland
Issue date:	04/27/1983
From:	Lucks A STONE & WEBSTER, INC.
To:	Cook R NRC
Shared Package
ML20072M111	List: ML20072M134 ML20072M146 ML20072M152 ML20072M169 ML20072M177 ML20072M189 ML20072M205 ML20072M212 ML20072M228
References
MPF-31, NUDOCS 8307140365
Download: ML20072M189 (10)

Text

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. J.O. NO. 14358 Midlcnd Plcnt Units 1 cnd 2 O O l Independent Ascessment of Underpinning  :

Weekly Report No. 31 April 17, 1983 through April 23, 1983 -

Personnel on Site Stone & Webster Michigan, Inc.

W. Kilker 4/18 - 4/23 A. Scott 4/21 - 4/23 P. Barry 4/18 - 4/20 .

A. Lucks 4/19 - 4/21  ;

Parsons, Brinckerhoff Michigan, Inc.

P. Parish 4/18 - 4/22  !

Meetings Attended Date Represented Purpose 4/18 Stone & Webster Daily Meetings through Bechtel 4/22 Consumers Power I Parsons (4/19 - 4/22) 4/21 Stone & Webster " Dry-Run" Pre-Bechtel sentation of Load /

Consumers Power Settlement Data Mergentime Activities Construction -

Pier W12: No activity. ,

Pier W9: No activity.

Pier Wil: The upper and lower leveling plates were installed and grouted. Bearing plates,jackstand, and jacks were placed and the Carlson meter electrical connections and telltale plates, box and dial gauge installations were completed. The pier is essentially ready for load transfer.

Pier W8 drift: Excavation and support of the drift advanced to within 6 ft. of completion. The excavated material consisted of approximately 2 ft, of unreinforced concrete underlain by clay fill with some zones of sand fill.

Pier E12: Routine rejacking based on structure movement was initiated on April 22.

The 110 percent of specified load was re-established by active jacking at which time a loosening of the driving wedges required that the 0.01 inch per 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> deflection criteria be satisfied by maintaining active jacking.

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i. 8307140365 830630 1 l PDR ADOCK 05000329 i O PDR

. . Midland Plant

. Units 1 and 2 Independent Assessment of Underpinning 2 Pier E9: Routine rejacking based on structure movement was initiated on April 22.

The procedure followed and results obtained were similar to those at pier E12. l Pier Ell: The lower leveling plate bearing plates, telltale bearing plate, box and dial gauges, jackstands and jacks were installed. Load transfer was initiated on April 23 Pier E8 drift: The drift excavation was completed. Installation of the final drift set was completed on April 23 The excavated material consisted of 2 ft.

of unreinforced concrete underlain by clay fill. An abandoned well screen and a deep seated benchmark casing were encountered near the west limit of the drift excavation.

Service Water Pump Structure: Granular backfill was placed and compacted to permit equipment access. Two exterior probe holes were then completed and grouted. The completioncf. coring the concrete floor slab for dewatering wells is delayed pending Engineering resolution of reinforcement bar interferences. '

Auxiliary Building Beam Fix: The major portion of the beam connection nodifications at El. 646, 659 and 704 were completed.

Quality Control, Documentation and Records:

1. Witnessed QC inspection of dry-pack grouting the upper level bearing plate at pier W11.

2. Witnessed the QC inspection of Hilti bolt holes along a portion of pier E8 drift.

3- 3 Observed the verification survey of centerline of pier W11.

4. Witnessed QA/QC sign-off inspection at pier E11 prior to load transfer.

Observations Construction - The installation of bearing plates, jackstands and jacks at piers E/W11 was done in a satisfactory manner. The E/W8 drift excavations were properly advanced and supported. Progress was frequently slowed by the curing time required for grout placed in abandoned Hilti bolt holes.

The rejacking operations at piers E9 and E12 and the initial load transfer at pier E11 were properly executed. The response of the load level at pier E12 during the rejacking of E9 and of load levels at both piers E9 and E12 during the loading of pier E11 demonstrated the sensitivity and interaction of the pier system to the application of loads up to 35 ft. distance.

Quality Control. Documentation and Records - The Team observations of the QC activities indicated the inspections were being properly done. The response of the field organization to the turbine building settlement near pier E8 was in accordance with procedural requirements.

The Assessment Team received a response to NIR #6 concerning the spacing requirements for pi.er lagging sets. In summary, the response stated that the Contractor has agreed with the Subcontractor to use the wider spacers conditions permitting. How-ever, no change would be made to the procedure. The Assessment Team appreciated the concern of the Contractor to changing the procedure. Nevertheless, it is our opinion that wording could be incorporated into the procedure that would assure the use of wider spacers unless certain dimensional orground conditions dictate otherwise.

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J. O. NO. 10359 Miditnd Pltnt )

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Ind;p;ndsnt Assessm:nt of Underpinning 3 The Assessment Team issued NIR #10 concerning the testing of the frequency of concrete vibrators. ACI 309 requires that concrete vibrators should be checked in concrete. The Contractor has been testing vibrators in air.

Design Work Packages - The Assessment Team performed an overview of the design work packages for the auxiliary building beam fix, the UAT modification and the E/W8 grillage beam installation. The auxiliary building beam fix and UAT packages were judged to be complete. With respect to the grillage beam installation, it was recommended that an additional existing construction procedure and instrumentation procedure be referenecd in the work package summary, and one signature block had not been signed on the installation procedure.

Non-Conformance Identification Reports Status of previous issues: (NIR numbers no longer listed have been closed-out.)

NIR NO. Description Date (Opened) (Closed) 5 Concrete Mix 2/10/83 Qualification 6 Lagging spacers 3/21/83 1

7 Backpacking Material 4/5/83 in Wet areas-Pier W11 8 Load Transfer Meth- 4/5/83 ,

! odology-Pier E12 l l l 9 Release of Pier W9 4/13/83 for Load Transfer 10 Verification of 4/21/83 Vibrator Frequency

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- O O DAILY INDEPENDENT ASSESSMENT TEAM MEETING Date: April 18, 1983 r

i Attendees: Bechtel Stone / Webster MPQAD CPCo E. Cviki W. Kilker R. Sevo G. Murray j J. Fisher P. Barry l

J. Gaydos

, 1. J. Fisher reported the auxiliary building beam fix has been started.

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2. A general discussion was held on the drift set Hilti bolt installation impact on time needed to advance the drifts to the respective piers.

At most drift set plate locations, the Subcontractor has been required to drill numerous additional holes due to encountering steel before full penetration was achieved. The abandoned holes require grouting and cure time before torquing the successful holes. I 3 In response to an earlier inquiry (see notes of April 14) by P. Barry on the NCR on a drift set in pier E12, J. Fisher stated that FSO has dis- i positioned it.

4. W. Kilker presented written inquiry on the load transfer interaction effects 3;. on adjacent piers. See attached sheet. J. Fisher will arrange for a separate discussion session with the Subcontractor.

5. J. Fisher stated he will measure wedges on E/W9 piers and report on use of various sizes.

6. In response to an earlier observation (see notes of April 15) by P. Barry, J. Fisher said that routine rejacking in the future will not necessarily result in a jack load reduction as was done on the April 14 rejacking of pier W9.

7. P. Barry discussed the Assessment Team observations on the UAT work package.

A question arose if any grouting of the soil outside the pipe is anticipated prior to opening the pipe wall. If so, the work package submittal may need revision.

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ASSESSMENT TEAM CUESTIONS CONCE?.NING AFFECT OF .

FIER INTERACTION As per specifications it appears that inadvertent unicading cf piers due te the leading of an adjacent pier is prevented by the criteria that requires rejacking at piers when the settlenent exceeds .01 inch in a continucus 43 hcur period. This could nean however, that while a pier is being icaded adjacent pier: may require rejacking at the same time and possibly affect the acceptance criteria of load transfer for the pier being installed. This would be critical where adjacent piers are close and/or have areas of overlapping pressures.

Will the load on piers adjacent to a pier undergoing initial load transfer te maintained by active jacking or will the application of a. rejacking

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load to these piers be determined by the deflection criteria?

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e u O O D,AILY INDEPENDENT ASSESSMENT TEAM MEETING Date: April 19, 1983 Attendees: Bechtel Stone / Webster MPQAD CPCo i E. Cviki W. Kilker W. Lytle G. Murray J. Fisher P. Barry J. Gaydos Parsons P. Parish

1. J. Fisher stated the meeting with Mergentime on the effect of jacking on adjacent piers will be scheduled for the week of April 25.

2. J. Gaydos reported that on piers E/W9 all driven wedges were originally 4 ft. long. However, interferences with drift sets required cutting of the ends after they were driven.

3 J. Fisher stated that Resident Engineering had informed him that the UAT work package would not require a change since no grouting will be done prior to opening the pipe wall.

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4. W. Kilker stated he met informally with J. Northrup. J. Northrup reported making progress in both clarifying inspection requirements and changing the welding requirements particularily on lagging and telltale boxes.

5. W. Kilker reported the Assessment Team had received a response from FSO on NIR #6. G. Murray requested a copy for CPCo in order to facilitate the close-out of the item. W. Kilker will report on the response within a day or so.

6. E. Cvikl said that to his knowledge no QARs had been issued on the Assessment Team NIRs 6, 7 or 8. W. Lytle will investigate.

7. P. Parish questioned if the design considerations had taken into account the extent of "open-area" under the turbine building that now exists. J. Fisher said Mergentime had verified with Project Engineering last month that the i

situation had been anticipated and analyzed.

8. E. Cvikl reported that a roof crack in the northwest portion of the SWPS had reached a width of 33 mils and that as an action the investigative

! agency was being alerted to perform an evaluation.

l 9 J. Fisher questioned if the Assessment Team had any concerns about the sampling of concrete at the end of the pumpline. W. Kilker and P. Barry replied that the sampling location does not concern the Team from a quality standpoint.

Any opinions expressed by the Team to date on concrete sampling locations were from the standpoint of logistics and expediency of the operation.

10. E. Cviki reported that Project Engineering is responding to the question of checking the vibrator frequency in air versus in concrete.

e O o DAILY INDEPENDENT ASSESSMENT TEAM MEETING Date: April 20, 1983 Attendees: Bechtel Stone / Webster MPQAD CPCo J. Fisher W. Kilker R. Sevo ------

J. Gaydos P. Barry S. Lucks Parsons P. Parish

1. J. Fisher stated that with respect to the UAT work package it has been determined that Mergentime will cut the pipe access later. The present work package will not include that activity.

2. R. Sevo requested a clarification on recently expressed Assessment Team concerns about concrete sampling. P. Barry and W. Kilker indicated that end of the pumpline sampling is of no quality concern to the Assessment

.. Team.

7 3 P. Barry said he had discussed his comments on the constructability package for grillages at piers E/W8 with FSO.

4. J. Gaydos responded to an earlier concern over the driving wedge length used at piers E/W9 All wedges conformed to the drawing requirements when driven but were later cut-off as required to avoid interfences with drift sets.

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. O DAILY INDEPENDENT ASSESSMENT TEAM MEETING Date: April 21, 1983 l Attendees: Bechtel Stone / Webster MPQAD CPCo J. Gaydos W. Kilker R. Sevo G. Murray E. Cvikl S. Lucks Parsons P. Parish

1. W. Kilker advised that the FSO response to NIR #6 on lagging spacers had been received. The response stated that in general the Subcontractor had been advised, in general, to use the wider allowable spacing. The Team is in agreement with this recommendation but feels the procedure should be changed to reflect the recommendation. NIR #6 will remain open.

2. G. Murray related that based on a recent discussion with the NRC the pier load test at W11 maybe delayed. The work permit for performing the load test has not been signed off by the NRC.

_. 3 E. Cviki reported that since last evening (April 20) the turbinebuilding,

"~ as monitored by the deep-seated benchmark nearest to pier E8, has undergone a few mills settlement and that further settlement will necessitate rejacking a pier E9

4. E. Cviki said the Resident Engineering group will meet to discuss presentation of data proposed for the NRC during their site visit next week.

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o O DAILY INDEPENDENT ASSESSMENT TEAM MEETING Date: April 22, 1983 Bechtel Stone / Webster MPQAD CPCo Attendees:

E. Cviki W. Kilker R. Sevo -----

J. Fisher A. Scott J. Gaydos Parsons P. Parish i

1. E. Cviki reported E9 and E12 piers will be rejacked today because a turbine building benchmark indicated the deflection criteria had reached the action I level.

2. J. Fisher said the benchmark pipes will be protected in the excavation from the construction operations.

3 E. Civkl said Engineering will establish the criteria for testing the concrete vibrator and forward this to QC.

4. There was a general discussion of the work released at the UAT.

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<mlNCIPAL STAFF Ce a4 azt2F p/RA SCSp L,, jg STONE & WEBSTER MICHIGAN, INC. A/RA pao q PPRP sto P.O. Box 2325. BOSTON. M ASSACHUSETTS O2107 DE ML ,4

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United States Nuclear Regulatory Commission April 27, 1983 Midland Site Resident Inspection Office Route 7 J.O. No. 14358 Midland, MI 48640 Ref. MPF 31 Attention Mr. R. Cook RE: DOCKET NO. 50-329/330 MIDLAND PLANT - UNITS 1 and 2 INDEPENDENT ASSESSMENT OF UNDERPINNING REPORT NO. 31 -

A copy of the Independent Assessment of the Auxiliary Building Underpinning Weekly Report No. 31 for the period April 17, 1983 through April 23, 1983, is enclosed with this letter. Included as attachmenta, are the minutes of the daily meetings held during the week between mambers of the Assessment Team and Site Engineering, Construction, and Quality Assurance personnel.

If you have any questions with respect to his report, please contact me at (617) 589-2067).

Very truly yours, M

g A. Stanley Lucks Project Manager Enclosures ASL/ka APR 2 9 M

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