ML20080C916
| ML20080C916 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 04/04/1983 |
| From: | Mooney J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 20506, NUDOCS 8308290386 | |
| Download: ML20080C916 (3) | |
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Executive Afnager MJind i+oject Office General Offices: 1945 West Pernall Road, Jackson, MI 49201 + (517) 788-0774 PRINCIPAL STAFF April 4, 1983 VRA d^
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US Nuclear Regulatory Commission il FI LE, pw Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER PROJECT APPLICATION OF EXCAVATION WORK PERMIT SYSTEM FILE 0485.16 SERIAL 20506
'Ihis letter responds to questions raised by Dr R B landsman during the ASLB Board hearings the week of February 14-18, 1983 as to why the Excavation Permit System did not include the underpinning work.
The Excavation Permit System is intended for general excavations on site and fcr those activities not covered and/or specifically located by design documents.
Examples of these activities are excavation for temporary utilities, slabs, roads, exploratory pits to locate utilities and temporary and permanent wells.
'Ihese permits are reviewed by appropriate discipline field engineers and superintendents to ensure that foundation subgrades for structures are not disturbed, the integrity of compacted backfill is maintained, and existing buried utilities are protected.
An equivalent system of protection is in existence for underpinning work.
All of the work associated with the major underpinning activities is covered by detailed procedures, drawings, quality plans and specifications and is monitored by field engineering, resident engineering and MPQAD Soils.
'Ih e design provides for protecting foundations of adjacent structures.
It specifies that the integrity of existing compacted backfill that is not to be replaced be maintained by use of lagging, bracing and/or soldier piles during excavation.
It also provides protection for all known underground utilities.
In the control tower area, the buried duct banks will be supported during underpinning as shown on C-1439 series drawings.
The permanent support of these utilities is being incorporated in the permanent underpinning design.
In the Service Water Pump Structure area, the braced excavation design incorporates all known utilities.
Details of support for these pipes and duct banks are shown on C-2031 series drawings.
All probing including those for establishing water levels and soils stabilization is' carried out in accordance with approved procedures and under the surveillance of the resident geotechnical engineering staff.
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i Design documents are coordinated with representatives of engineering, construction and the quality groups, to provide the necessary control. Also, Appendix E of Specification C-200 addresses corrective measures for unplanned events. A t
further control of the underpinning activities is provided through the use of the CP Co-NRC Work Authorization Procedure and the soils work permit system.
As explained'above, it is evident that the underpinning work is adequately controlled to protect subgrades for adjacent structures, to maintain the integrity of compacted backfill, and to protect buried utilities. 'Ihere fore CP Co believes that it is not necessary to use the Excavation Permit System for this work.
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Ccu=sel fer the NEC Stac U S Nuclear Regulstery Cc==t.
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