ML20081C753
| ML20081C753 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 03/05/1984 |
| From: | Mooney J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harrison J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| CSC-7416, OL, OM, NUDOCS 8403150003 | |
| Download: ML20081C753 (30) | |
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March 5, 1984 Mr J J Harrison Chief, Midland Project U S Nuclear Regulatory Commission Region III 799 Roosevelt Road Clen Ellyn, IL 60137 MIDLAND ENERGY CENTER CWO 7020 SERVICE WATER PUMP SYSTEM CRACK SURVEY File:
0485.16.2 UFI:
42*05*22*04 Serial: CSC-7416 0.4.2 10150(S)
REFERENCE:
(1) CPCo letter CSC-7292, dated February 8,1984 (2) NRC Inspection Re. port #84-01 (OSC) dated January 17, 1984 Enclosed is the Service Water Pump Structure Crack Survey Report.
This report follows the same format and criteria as the Auxiliary Building Crack Survey submitted in Reference 1.
Following your review of the enclosed submittal, we request your concurrence
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of the modifications to the crack mapping program. We can discuss the details if desired, at our meeting on April 4, 1984.
00 JAM /CMM/klw Attachments CC RFWarnick, NRC Region III w/o RBLandsman, NRC Region III w/a RJCook, NRC Senior Resident Inspector, Midland Site w/a
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DSHood, Project Manager Midland 5 w/Sa
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8403150003 840305 l
PDR ADOCK 05000329
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CONSUMERS POWER COMPANY Midland Units 1 and 2 Docket No 50-329/50-330
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Letter Serial CSC-7416 Dated March 5,1984 At the ' request of the Commission and pursuant to the Atomic Energy Act of 1954, and the Energy. Reorganization Act of 1974, as amended and the Commission's Rules and Regulations thereunder, Consumers Power Company submits Service Water Pump System Crack Survey dated March 5,1984, Serial CSC-7416 from J.A Mooney to J J Harrison.
CONSUMERS POWER COMPANY By GO h JApooney Executive Manager Sworn and subscribed before me.this [,
day of M
,1984.
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As DJ NotaryPubfff en LCI 5-;;;bs14.it.r;;s;.n..,. # **
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My Commission Expires
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OM/0L' SERVICE LIST Mr Frank J Kelley, Esq Atomic Safety &' Licensing Attorney General of the Appeal Board State of Michigan U S Nuclear Regulatory Commission -
Ms Carole Steinberg, Esq Washington, DC 20555 '
Assistant. Attorney General Environmental Protection Division-Mr C R Stephens (3) 720 Law Building Chief, Docketing & Services Lansing, MI 48913 U S Nuclear Regulatory Commission Office of the Secretary Washington, DC 20555 Mr Myron M Cherry, Esq Suite 3700 Ms Mary Sinclair Three First National Plaza 5711 Summerset Street Chicago, IL 60602 Midland, MI 48640 Mr Wendell H Harshall Mr William D Paton, Esq RFD 10 Codnsel for the NRC Staff Midland, MI 48640 U S Nuclear Regulatory Commission Washington, DC 20555 Mr Charles Bechhoefer, Esq Atomic Safety & Licensing Atomic Safety & Licensing Board Panel Board Papel U S Nuclear Regulatory Commission U S Nuclear Regulatory Commission Washington, DC 20555 Washington, DC 20555 Dr Frederick P Cowan Hs Barbara Stamiris 6152 N Verde Trail 5795 North River Road
" Apt B-125 Rt 3 Boca Raton, FL 33433 Freeland, MI 48623 Mr Fred Williams Dr Jerry Harbour Isham, Lincoln & Beale Atomic Safety & Licensing 1120 Connecticut Avenue, NW, Suite 325 Board Panel Washington, DC 20036 U S Nuclear Regulatory Commission
~ ~,
Washington, DC 20555 Mr James E Brunner, Esq Mr M I Miller, Esq Consumers Power Company Isham, Lincoln & Beale j
212 West Michigan Avenue Three First National Plaza.
Jackson, MI 49201 52nd Floor Chicago, Il 60602 Mr D F Judd Mr John Demeester, Esq Babcock & Wilcox Dow Chemical Building PO Box 1260 Michigan Division Lynchburg, VA 24505 Midland, MI. 48640 Mr. Steve Gadler, Esq Ms Lynne Bernabei 2120 Carter Avenue Government Accountability Project St Paul, MN 55108 1901 Q Street, Fni Washington, DC 20009 i
i 9/3/83 miO583-0429a100-12
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BCC:
SHHow311, M-1180 JWCook, P26-336B TABuczwinski, Midland JNLeech,P24-5Q7 DFLewis, Bechtel DJVanderWalle, P24-614B MIMiller, IL&Bm Chicago FCWilliams, IL&B, Washington DC GALowe, P12-237A NRC Correspondence File, P24-517 UFI, P24-517 FJWalraven P24-517 Hearings File, P24-517 e
CMS, Midland RAWells, Midland Al'Braber, LIS Reading Copy:
(P24-515, Rotha Boroff)
DM3udzik RJErhardt ISGibson DTPerry O e 4
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e SERVICE WATER PUMP STRUCTURE CRACK SURVEY PURPOSE A Crack Survey of the Service Water Pump Structure was performed by Bechtel _
Resident Engineering. The purpose of this survey was to identify all cracks and crack patterns of significance that exist in the Service Water Pump Structure.
Data on locations, patterns, and widths of cracks was studied to
)
see if it indicated 'any perceptible changes in stress distribution and if the present crack mapping program has been efficient in providing representative information.
SCOPE OF SURVEY All readily accessible floor, roof, interior and exterior wall areas of the
,, building were reviewed by the Resident Engineering Group.
All significant cracks (approximately 0.010" and larger) and any groupings of smaller cracks l
l judged to be significant by the Resident Engineers were identified and l
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recorded. The crack data from the survey (location, length, vidth and l
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l pattern) was transferred to elevation views of the walls and plan views of the
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floors and roof slabs.
Areas which were inaccessible were noted on the drawings.
I RESULTS OF SURVEY Engineering Sketches SK-C-1435. Revision A through SK-C-1441. Revision A show the results of the Eng neering Crack Survey on the walls and floor slabs of the Service Water Pump Structure. All.significant cracks, as well as their associated widths, have been indicated.
Cross hatching has been used to denote areas. that were obstructed or otherwise inaccessible to the survey teams.
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5 Servica Watar Pump Structure Crack' Survey Pags 2 Assessment i
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I Selected areas of the Service Water Pump Structure (SWPS) were inspected by personnel from Construction Technology Laboratories (CTL) on February 20 and 21,'1984. Areas were selected for inspection based on the following:
1.
Because crack width determinations invcive significant judgement, universal' agreement on crack width measurements did not always occur.
CTL was asked to resolve differences in judgment between the Bechtel survey results and the Wiss, Janney, Elstner & Associate's (WJE) results from their regular crack mapping program.
2.
The overhang portions of the structure, where structural cracking might be
' expecte'd to occur due to settlement were selected by CTL for inspection.
During the insp/-ection of these areas, CTL checked the Engineering Crack Survey results - for adequacy, thorotghness, and conformance to as-built conditions.
In addition to reviewing' cracks in the overhang portions and in areas where
'~ differences with the WJE survey were found, eight specific crack's that had
~
been discovered recently were evaluated.
CONCLUSIONS
The Engineering. Crack Survey of the Service Water Pump Structure adequately documented all significant cracks in the areas that are unobstructed and accessible.
The evaluation of the SWPS Engineering Crack Survey results.-
I observation of the structure itself, and reyiew of the settlement and strain.
conitoring data, all confirm 'the conclusion reached in the CTL Report, dated February 1982, previously submitted to the NRC. No conflicts were noted among displacement readings, strain ~ readings,, and observed cracks.
Overall crack patterns have not changed. Within the system reliability, displacement, re'adings indicate that there has been very.little total and differential e p
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Service ilater Pump Structura Creek Survay Pags 3 settlement.
Of the eight newly identified cracks, seven (identified by a 1
single asterick on the Engineering Sketches) are related to volume change, In the remaining case (identified by a double asterick on the Engineering Sketches), structural cracking could not be ruled out.
However, there is a high probability that this crack is also due to volume change.
The survey and the subsequent evaluation have indicated that the dewatering and preliminary excavations above the foundation of the overhang, to date, have not affected the competence of the structure.
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CRACK MAPPING PROGRAM DURING UNDERPINNING 1
PURPOSE The purpose of crack mapping of the Servics Water Pump Structure is to i
supplement the strain monitcring data, settlement data, and differential movement data. All of this information'-is then used to assess the effect f the. underpinning operation on the structure. The existing crack mapping ~
program is discussed below, as well as sugge$ted modifications to the program.
These modifications are intended to focus the intensity of the present program on those areas of the structure that are expected to be influenced the most by the dewatering and the underpinning operations.
- PRESENT CRACK MAPPING PROGRAM The areas which are currently being monitored for cracks in the Service Water
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Pump Structure aie as follows:
1.
Zones of relatively higher calculated stresses based on Finite Element.
Stress Analysis shown in Attachment A.
2.
Areas crack mapped by Construction Te.chnology Laboratories (CTL) are shown in Attachment B.
' PROPOSED CRACK MAPPING PROGRAM The modifie'd crack mapping program woold iiclude accessible areas in the critical locations in the overhanging portions of the Service Water Pump,
Structure resting on fill.
1.
Underside of roof slab at El. 656'-0".
(North end enly).
(See Figure 1).
2.
East Wall (interior face).
(See Figure 2).
3.
West Wall (interior. face).
(See Figura 3).
4.
Center East Wall (East face).
(See Figure 4).
5.
Center West Wall (West face).
(See Figure 5).
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Crack Mapping Program During Undsrp' inning Paga 2 As stated previously, these modifications to the existing crack mapping program were proposed in an attempt to make it more efficient' and effective.
The major considerations behind these changes can be sun:marized as follows:
l.
They will allow mapping personnel to concentrate on significant areas and data.
2.
They were derived base'd on the expected structural response of the structure to both upward and downward movement during the underpinning operation.
3.
They were arrived at af ter evaluating the results of the Engineering Crack Survey of the Service Water Pump Structure, which showed no significant cracking.
'4. These changes and the existing strain monitoring and relative movement data will ensure that any detrimental effects that the underpinning operation may have on the Service Water Pump Structure will be quickly identified.
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