ML20083Q495
| ML20083Q495 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 12/28/1982 |
| From: | Lucks A STONE & WEBSTER ENGINEERING CORP. |
| To: | Cook R NRC |
| Shared Package | |
| ML20083Q415 | List: |
| References | |
| MFP-14, NUDOCS 8302250414 | |
| Download: ML20083Q495 (9) | |
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STONE 6 WEBSTER ENGINEERING CORPORATION 245 SUMMER STREET. B oSTON. M ASS ACHUSETTS ACORESs Au. CORRESPONDENCE TO P.O. SOX 2325. SOSTON. MASE. 02107 W. O.T E L E X: 94-0009 on st C NSTRUCTioN o
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5 United States Nuclear Regulatory Commission December 28, 1982 Midland Site Resident Inspection Office l
Route 7 J.O.
NO.
14358 Midland, MI 48640 Ref. MFP 14 Attention Mr. R. Cook RE:
DOCKET No. 50-329/330 Midland Plant - UNITS 1 AND 2 INDEPENDENT ASSESSMENT OF AUXILIARY BUILDING UNDERPINNING REPORT NO.
14 A copy of the Independent Assessment of the Auxiliary Building Under-pinning Weekly Report No. 14 for the period Decembe~r 19 through December 25, 1982, is enclosed with this letter.
Included, as an attachme.nc, are the minutes of the daily meetings held during the week between members of
,j the Assessment Team and Site Engineering, Construction and Quality Assur-f ance personnel during the week.
If you have any questions with respect to this report please contact,,me at (617).589-2067.
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Very truly yours, M
t
,e-A. Stanley s
Project; Manager Enclosures ASL/ka l
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8302250414 830211
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PDR ADOCK 05000329 G
J. O. NO.
14358 Midland Plant Units 1 and 2 Independent Assessment Auxiliary Building Underpinning Weekly Report No.
14 December 19 through December 25, 1982 Personne'l on Site Stone & Webster Engineering Corporation (SWEC)
B. Holsinger 12/20 - 12/23 W. Kilker 12/21 - 12/22 A. Scott 12/20 - 12/21 Parsons, Brinckerhoff,Quade and Douglas (PBQD)
J. Ratner 12/21 - 12/22 Meetings Attended Date Represented Purpose 12/20 Stone & Webster Daily Meeting through Bechtel J
12/23 Consumers Power Parsons (12-21/12-22) 12/21 Stone & Webster Discussion of assess-Consumer s Power '(M~.'QAD) ment Team activities NRC an.d MPQAD role in Parsons implementation of underpinning design p
.- 12/21 Stone & Webster Discussion o'r require-o Bechtel ments for vibration of Consumers Power concrete in pier bells,.
NRC ~
update on settlement monitoring data, and NRC restriction on non - auxiliary build-ing underpinning activi-ties.
Activities Construction - The advancement of the pier W12 drift excavation was restricted to removing approximately 1 foot of concrete at the toe of the face to about 4 ft. at the top or the drift.
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J.-O.
NO.
14358 Midland Plant Units 1 and 2 Independent Assessment.
Auxiliary Building Underpinning 2
The concrete was removed by initially advancing 2 inch diameter drill holes space at 1 'ft. - 1) ft.' centers to a depth of 1 ft. - 2 ft. and subsequently a hydraulic rock splitter was utilized to dislodge the concrete.
Finor quantitles of perched groundwater entered the excavation in the north-i east corner of the pier W12 access drift along a narrow band of soil between l
the access pit 3 gging and the-lean concrete encountered under the turbine building. The seepage was not sufficient to cause instability or loss of ground in the soil mass. The water was controlled by directing it to a sump hole in the access pit and then removed by pumping.
Construction was initiated on the pier E12 acce'ss pit.
The 6 ft. x 8 ft.
pit was excavated from El 609) to El 601. Lagging, similiar to that used in the pier W12 access pit, was installed on three sides of the pit as the excavation progressed. A formed vertical face of concrete was encountered on the south side of the pit immediately under the turbine building found-ation mass.
Once the pit reached El 601 lagging boards were also installed on the south face. Backpacking and excelsior placement procedures were similar to those employed to complete the pier W12 access pit.
Minor perched groundwater seepage, estimated at less than 0.1 gpm, entered the. pit between the lowerlevels of the east side lagging.
A sump hole was dug in the pit to collect the seepage and tha water was then pumped out.
Quality Control, Documentation and Records -
1.
Observed. the methodology of proficiency testing of the Quality Control, Inspect 6rs by the QA engineers on the access pit and, drift excavation /'
d-j lagging iruf anchor bolt installations.
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- 2. cRevflwed Quality Control Instructions on excavation / lagging, field fabrication of miscellaneous items for lagging, miscellanous steel and steel sets.
w Observations Construction - The removal of the mass lean concrete in the W12 pier access rift proceeded according to project requirements.
Perched groundwater seep-a age was properly controlled., Careful observations were maintained by the i
contractors orthe stability of a narrow band of soil between the access pit and lean concrepe mass.
Quality Control, Documentation and Records -
The Assessment Team considered the QA metiodology of proficency training of inspectors to date to be quite adequate.
An addition, the quality inspector procedures reviewed by the team will, (when implemented) assure adequate control of the activity.
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J. O. NO. 14358 Midland Plant Units 1 and 2 Independent Assessment Auxiliary Building Underpinning 3
Non-Conformance Identification Reports Status of previous issues:
out during previous weeks.) (NIR numbers no longer listed have been closed-NIR NO.
Description Date (Open)
(Closed )
3 coupler Testing 12/14/82 Temperature J.'
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL Date:
De$ ember 20, 1982 Attendees:
Bechtel Stone / Webster MPOAD CPCo J. Fisher A. Scott L. Kettren R. Weiland E. Cviki B. Holsinger 1.-
J. Fisher mentioned visit of the NRC with Assessment Team on December 21, 1982.
2.
B. Holsinger discussed concerns with stainless steel to carbon steel welding qualification procedure.
3 J. Fisher mentioned that Bechtel would have a daily 4:30 PM meeting between Bechtel and Mergentine to clear up problems of the day &
prepared for next day work.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH EECHTEL O-Date:
Dec'.mber 21, 1982 Attendee,s:
Bechtel
' Stone / Webster MPOAD CPCo R. Bradford W. Kilker A. Scott B. Holsinger 1.
A. Scott requested that R. Bradford expedite the team request for
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Mergentime prints.
2.
A. Scott requested results of recent tests on the " mud-mat" mix.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL Date:
December 22, 1982 Attendees:
Bechtel Stone / Webster MPQAD CPCo R. Bradford W. Kilker E. Cviki B. Holsinger Parsons J. Ratner 1.
J. Ratner asked two questions on which E. Cviki referred him to M. Lewis for clarification.
A.
Does 2 ft. of groundwater level below excavation restriction apply in the present access pit advancement.
B.,'Can the top of the drift advance more than 9" beyond the 1st drift set even though the work is in the concrete.
2.
B.9Holsinger advised that an NIR will be issued on a procedure.
'vs AWS code conflict on stainless to carbon steel welding.
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INDEPENDENT ASSESSMENT TEAM MEETING WITH BECHTEL Date:
December 23, 1982 Attendees:
Bechtel Stone / Webster MPQAD CPCo R. Bradford B. Holsinger S. Jagdish G. Murray E. Cviki G. Murray advised that the NRC will continue to require a one-week 1.
lag-time between piers W12 and E12 once the concrete removal is complete.
CPCo will issue a memorandum,.
E. Cviki noted that if Bechtel's action is required on any of the 2.
Assessment Team issued NIR's,MPQAD cr SMO should see to it they recevie a copy at the earliest possible date.
B. Holsinger' observed that in his opinion the Soils Remedial /MPQAD 3
group is now functioning better organizationally than upon his arrival on-site in Ssptember 1982.
M. Lewis has answered the two questions of J. Ratner (see notes 6f 4.
December 22, 1982.)
A. Groundwater encountered in pit is perched and does not need to be maintained ~2 ft. below working level.
The top of the drift c'an be advanced to the location of the I,d g; B.
f next drift set but the bottom can only go 9 inches beyond the first drift set location.
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Project Procedure 5-?.0 Page 1 of 3 STONE AA'D WEESTER ENG]NEERING CORPORATION NDNCONFORMANCE IDENT]FICAT10N REPORT DATE OF NONCONFORMANCE:
December 28. icr83 NIR Number 4
i 10ENT]FICATION/LOCAT10N OF ITEMS:
Mergentime procedure on welding (MCP 19.000 Rev 6) - cualificatinn remtrietinna nn etnin1..e =+. 1
+9 en-H
.t. 1._,. y i n y (Refer to Attachment E MEP 10. )
DESCRIPTION OF NONCONFORMANCE:
The project procedure permits electrode weld wire sizes that exceed the size used in the qualification process - in this Fase 1/8 inch and 5/92 inch etimment,
ts. aue ns_3 r3nne n ii s
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restricts the use or electrode sizes oniv to tho's'e si2e'saua'1'ifie"d b"v' demonstration
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(Refers to ecs 25 and 26-29 of MCP 19). In additinn-the nen e. ri,i r.
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PROJECT MANAGEMENT CONCURRENCE:
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INITI ATOR CONCURRENCE:
PROJECT MANAGEMENT CONCURRENCE:
DATE:
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