ML20040F152

Forwards Evaluation of Auxiliary Bldg Control Tower & Electrical Penetration Areas at Midland Plant to Fulfill 820111 Commitment.Rept Supports Util Conclusions Re Plant Structural Integrity

ML20040F152
Person / Time
Site:	Midland
Issue date:	01/29/1982
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML20040F153	List: ML20040F152 ML20040F157
References
15527, NUDOCS 8202080382
Download: ML20040F152 (2)

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O Consumers PDWer James W Cook

(* ire President - Projects, Engsneering and Constructi-m Ga.aral offices: 1945 West Parnell Road, Ackson. MI 49201 * (517) 788 0453 January 29, 1982 cp

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r; Harold R Denton, Director a B5 79gg ^ j Office of Nuclear Reactor Regulation US Nuclear Regulatory Commission

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Washington, DC 20555 6 gut;F g 4

MIDLAND PROJECT / lJ \

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MIDLAND DOCKET NOS 50-329, 50-330 EVALUATION REPORT FOR THE AUXILIARY BUILDING CONTROL TOWER AND ':LECTRICAL PENETRATION AREAS FILE 0485.16 SERIAL ,15527 ENCu0SURE: EVALUATION OF AUXILIARY BUILDING CONTROL TOWER AND ELECTRICAL PENETRATION AREAS AT MIDIAND PLANT On December 10, 1981 and January 11, 1982, meetings were held with the Staff and its consultants to discuss concrete cracks in the auxiliary building, the service water pump structure, the diesel generator buildings and the feedwater isolatica valve pite. During the January 11, 1982 meeting, Consumers Power agreed to provide the NRC with an evaluation of the significance of concrete cracks relative to the design strength of the auxiliary building control tower and electrical penetration areas.

In response to this commitment, we are providing the enclosed report entitled

" Evaluation of Auxiliary Building Control Tower and Electrical Penetration Areas at Midland Plara" by Messrs W G Corley and A E Fiorato of Construction Technology Laboratories, a Division of the Portland Cement Association. This report presents an evaluation of the significance of cracks observed in the auxiliary building control tower and electrical penetration areas. The information, measurements and test data presented in the enclosed report lends further support tc our conclusion that: (1) cracks in an adequately reinforced concrete member do not prevent the member from developing its q gl expected strength, and (2) cracks in the auxiliary building control tower and 3

electrical penetration areas are the result of restrained volumetric changes which occurred during the curing and drying of concrete and are not due to j structural distress. In additica, a program for monitoring structural integrity during the implementation of remedial measures is outlined.

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During the underpinning operation, cracks in the auxiliary building control tower vud electrical penetration areas will be monitored and recorded by mapping at the time of specific construction milestones. These constraction oc0182-0018a100 8202080392 820129 PDR ADOCK 05000329 A PDR j

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, 2 milestones, at which time crack mapping will be performed, are being identified et this time and they will be provided by separate correspondence.

Based upon the information contained in the enclosed report, we conclude that the present cracks in the auxiliary building control tower and electrical penetration areas are of no structural significance, and any changes in their condition during the underpinning operations will be monitored and, if nece-aary, evaluated.

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CC Atomic Safety and Licensing Appeal Board, w/o CBechhoefer, ASLB, w/o MMCherry, Esq, w/o FPCowan, ASLB, w/o RJCook, Midland Resident Inspector, w/o RSDecker, ASLB, w/o SGadler, w/o JHarbour, ASLB, w/o GHarstead, Harstead Engineering, w/a L:(Hood, NRC, w/a (2)

OfJudd, B&W, w/o JDKane, NRC, w/a FJKelley, Esq, w/o RBLandsman, NRC Region III, w/a WHMarshall, Esq, w/o JPMatra, Neval Surface Weapons Center, w/a W0tto, Army Corps of Engineers, w/a WDPaton, Evj, 4/o SJPoulos, gem.cchnical Engineering, w/a FRinaldi, Ki;f. , w/a HSingh, Army Corps of Engineers, w/a BStamiris, w/o oc0182-0018a100 J