ML20091M917
| ML20091M917 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 01/25/1983 |
| From: | Lucks A STONE & WEBSTER, INC. |
| To: | Cook R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML17198A223 | List:
|
| References | |
| CON-BOX-10, FOIA-84-96 MPF-18, NUDOCS 8406120146 | |
| Download: ML20091M917 (9) | |
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STONE 6 WEBSTER ENGINEERING CORPORATION l
245 SuuutR STREET. Bo SToN. M ASS ACHUSETTS i
ACOnEss ALL cOnnEsPONDENCE TO P.O. BCE 2325. SOSTON. M A S S. 02107 W W TELEX 940001
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United States Nuclear Regulatory Commission January 25, 1983 Midland Site Resident Inspection Office Route 7 J.O.
NO.
14358
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Midland, MI 486ft0 Ref. MPF 18 Attention Mr. R. Cook i
RE: DOCKET No. 50-329/330 Midland Plant - UNITS 1 and 2 INDEPENDENT ASSESSMENT OF AUXILIARY BUILDING UNDERPINNING REPORT NO.
18 A copy of the Independent Assessment of the Auxiliary Building Under-pinning Weekly Report No. 18 for the period January 16, 1983 through January 22, 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 Very truly yours, O.AYd sw A. Stanley Lucks Project Manager l
Enclosures l
ASL/ka l
t 0406120146 840517 PDR FOIA PDR RICE 04-96 i
J.O. NO.
14358 Midland Plant j
Units 1 and 2 Independent Assessment i
Auxiliary Building Underpinning
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f Weekly Report No. 18 January 17, 1983 through January 22, 1983 Personnel on Site 1
Stone & Webster Engineering Corporation (SWEC1 W. Kilker 1/17 - 1/20 L. Rouen 1/19 - 1/22 P. Barry 1/17 - 1/22 i
Parsons, Brinckerhoff, Quade and Douglas (PBQD) l V. Madill 1/17 - 1/21 Meetings Attended Date Represented Purpose 1/17 Stone & Webster Daily Meetings through Bechtel
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1/21 Consumers Power Parsons 4
1/21 Stone & Webster Weekly Soils Review Bechtel Consumers Power Activites Construction - Pier W12 was excavated to the approximate final elevation of 1
564.6.
At this elevation support channelswere grouted and the sud-nat con-crete placed., The excavation for the bell was not started..
Wood lagging was used to temporarily support the side of the pit in the zone to be later,
j excavated for the bell.
l The material encountered during this weeks excavation'in W12 was predominately natural (undisturbed) gray clay containing some small silt lenses. As excav-i ation approached the final elevation, very few silt lenses were ancounted and Unly small traces of silt were evident in the clay. The flos fate of perched groundwater into the excavation had reduced to approximately 10-15 gallons per day.
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14358 Midland Plant Unita 1 and 2 Independent Assessment l
Auxiliary Building Underpinning 2
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After, entering the natural clay, the pier pit was alternately excavated approximately 42 inches and legged. However, after breakback occurred the inslagged portion of the excavation was not allowed to exceed 18 inches.
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-The void left by the breakback was formed and filled with grout. Prob-ing for groundwater was performed as the pit was advanced. No ground-t water was encountered (apart from the perched groundwater at El 586) j and the probe hole was grouted as required by the construction procedures.
f Excavation and lagging of pier E12 was begun this week and progressed to f
i El 588. In addition fill concrete, the excavated material was a combination j
i of sand and clay backfill, no perched groundwater was observed. The pier l
pit was alternately excavated approximately 18 inches and lagged. Backpacking 4
of the lagging was done after installation of each spreader set (overy 4th set).
The backpacking asterial was an imported medium grained sand.
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Quality Control Documentation and Records-1.
Reviewed records of th'e performance demonstration that the j
Assessment Team witnessed the previous week.
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Observed the MCE's verification of satisfactory conditions j
of pier W12 rounding grade.
3 Observed the verification of the W12 founding grade elevation.
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Reviewed qualification and certification records for the new 1
l excavation inspectors.
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Observed QC inspection of bolting of spreader sets.
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Observed batching of concrete for W12 mud-nat.
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Observed testing of concrete for W12 mud-nat.
Observations i
Construction - The Assessment Tema determined that the construction practices i
employed to'~sdvance both the E12 and W12 pier excavations were in compliance with the project documents. In particular, the Assessment Team observed in-i stances where work had progressed to an inspectjon point and was stopped i-until MPQAD was notified and an inspector was made available. the' Assessment Tsaa inspected the_ founding grade for pier W12 and did not notsi any unstable conditions. These observations agreed with the RGE's verifloatJon of natis-i factory foundation conditions. It is the opinion of the Assessment Team, that the parties involved have exhibited great care in following procedures and l
performing the work in the best manner possible.
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14358 Midland Plant Units 1 and 2 Independent Assessment j
Auxiliary Building Underpinning 3
l Quality Control. Documentation and Records - Training of MPQAD personnel continues in order to build-up sufficient numbers of knowledgeable inspectors.
IIowever, the need for inspectors has not resulted in " rubber stamping" cert-Ofications. 'This point is demonstrated by the fact that certification was denied one inspector who did not adequately document inspection documents to be used in his performance evaluation. This and other performance demon-strations were witnessed by the Assessment Team. The performance demonstrations were observed to be rigorous as to inspection details. The attention of super-3 visors to inspection hold points was clearly deponstrated on several occassions.
Certification documentation reviewed was adequate and in accordance with pro-cedures.
i Non-Conformance Identification Reports NIR #3 - Closed as a result of a CPCo safety Analysis Report change prepared for submission to the NRC. The change describes the commitments to control the production testing of the couplers.
Status of previous issues:
(NIR numbers no longer listed have been closed-out during previous weeks.)
NIR No.
Description Date (0pened)
(Closed) 3 Coupler Testing 12/2/82 1/21/83 Temperature 4
Welding Qualifi-12/29/82 cation Procedure Y
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Project Engineer Project Manager G
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s INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL i
January 17.-1983 Date:
l Attendees:
Bechtel Stone / Webster MPQAD CPCo E. Cviki W. Kilker R. Sevo G. Murray j
R. Bradford 1.
W. Kilker advised that Project Engineering had responded to NIR #3 W. Kilker requested G. Murray or E. Cvikl obtain for him a copy of the proposed SAR change notice on interpretation of the ASME III code i
with respect to the coupler testing.
2.
R. Bradford reminded R. Sevo that QA must issue a new letter on the qualifications of the jack calibration agency.
(MPQAD is in the process of auditing and certifying the manufacturer / calibrator.)
3 E. Cvikl advised that the Bechtel concrete specialist requested to be advised of the first pier concrete placement so as to be on-site.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL i
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Date: January 18, 1983 i
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1 Attsndees:
Bechtel Stone / Webster MPQAD CPCo I
E. Cviki W. Kilker G. Murray J. Fisher t
Parsons-
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1 1.
E. Cviki reported he had received a copy of the FSAR change notice j
on the code requirements for testing of the Fox-Howlett couplers.
However, he needed a clarification prior to passing it on.
f 2.
J. Fisher said that starting today, the subcontractor will not attempt to fill the space between lagging levels unless in the view of the Geotechnical Engineer a large enough void' exists behind the lagging to initiate a backpacking operation.
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j INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL i
I Date: January 19, 1983 1
-Attendees :
Bechtel Stone / Webster MPQAD CPCo i
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J.' Fisher W. Kilker E. Cviki Paul Barry D. Lavelle
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Parsons f,
V. Madill 1.
W. Kilker advised that NIR #3 on Testing Temperature of Ccuplers is being closed-out based on the SAR change notice.
(The notice describes the in-tent to design the underpinning structure in accordance with ACI 349 not to ASME III - 2.)
1 2.
J. Fisher advised that the audit of the jack calibration agency is complete and QC is witnessing the calibration.
3 J. Fisher issued the notes of a step-by-step procedure prepared by by Mergentime on excavating the pier bell.
4.
The importance of maintaining a proper perspective with respect to backpacking was discussed. Attempting to backpack very narrow or j
spaces of limited special extent was not the intent of the procedure,
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nor is it considered necessary from the standpoint of a high quality installation. Backpacking will be used to prevent loss of ground and when in the opinion of the Geotechnical Engineer the trimming of the soil results in large void spaces.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL
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Date: January 20, 1983 2
i Attendees:
Bechtel Stone / Webster MPQAD CPCo J. Fisher W. Kilker G. Murray i
E. Cviki L. Rouen j
J. Kelleher P. Barry Parsons V. Madill 1.
J. Fisher reported that a zone of clay along the north side of pier W12 at approximately E1573 had spalled into the excavation last night. The zone was approximately 6 ft. long 2 ft. high and up to 1} ft, deep. The subcontractor was authorized to grout the void to maintain stability and was performing that procedure this morning.
2.
The option of placing concrete only in the bell of pier W12, maybe selected if in excavating and preparing the bell the clay material appears somewhat unstable.
J. Fisher will insure that QC can support that option, if selected.
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Discussion of the need for the sign-out of a work petmit for the load transfer work on pier W12 with held.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL i
j Date: January 21, 1983 Attendees:
Bechtel Stone / Webster MPQAD CPCo j
J. Fisher P. Barry G. Murray'
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R. Bradford L. Rouse
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Parsons V. Madill l
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1.
J. Fisher stated that the work schedule would remain 2-10 hr. shifts 6 days aweek during the excavation of the bell. Work over and above this scheduled will be performed as needed to stabilize 'the excavation if required.
2.
R. Bradford stated that all material necessary to place, concrete in the bell, if that option is used, is available now. Concrete can be ordered o
normally during the day, and arrangements have been made to have con-crete delivered at night-and on weekends if necessary with minimum of advanced notice.
3 The fabricators of the Fox-Howlett couplers in the fab sh6p are qual-j iried splices. This will allow half of the coupler to be torqued at the fab shop.
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