ML20049J101

Forwards Evaluation of Cracking in Svc Water Pump Structure at Midland Plant, Per 820111 Meeting Commitment

ML20049J101
Person / Time
Site:	Midland
Issue date:	03/02/1982
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML20049J102	List: ML20049J101 ML20049J103
References
NUDOCS 8203120063
Download: ML20049J101 (2)

Text

e . ss Consumers Power James W Cook C0mp8ny na na,u - n inaa,s.<a.,

and Construction 1

General offices: 1945 West Parnell Road, Jackson, MI 49201 * (517) 788 0453 i March 2, 1982 O)

D 9 E R c%'50 ,

Harold R Denton, Director

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Office of Nuclear Reactor Regulation US Nuclear Regulatory Commission J 7 k8A Washington, DC 20555 MIDLAND PROJECT 4 m MIDLAND DOCKET NOS 50-329, 50-330 EVALUATION REPORT FOR THE SERVICE WATER PUMP STRUCTURE FILE 0485.16 SERIAL 16009 ENCLOSURE: EVALUATION OF CRACKING IN SERVICE WATER PUMP STRUCTURE AT MIDLAND 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 isolation valve pits. During the January 11, 1982 meeting, Consumcro Power agreed to provide the NRC with an evaluation of the significance of concrete cracks relative to the design strength of the service water pump structure.

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

" Evaluation of Cracking in Service Water Pump Structure at Midland Plant" 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 service water pump structure. The information, measurements and test data presented in the enclosed report lends further support to our conclusion that: (1) cracks in an adequately reinforced concrete member do not prevent the member from developing its expected strength; (2) cracks in the service water pump structure are primary attributable to restrained volumetric changes which occurred during the curing and drying of concrete; and (3) no evidence of structural distress was observed. In addition, a program for monitoring structural integrity during the implementation of remedial measures is outlined.

During the underpinning operation, cracks in the service water pump structure will be monitored and recorded by mapping at the time of specific construction milestones. These construction milestones, at which time crack mapping will be performed, are being identified at this time and they will be provided by separate correspondence.

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Based upon the information contained in the enclosed report, we conclude that the present cracks in the service water pump structure are of no structural significance, and any changes in their condition during the underpinning operations will be monitored and, if necessary, evaluated.

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g JWC/RLT/dsb CC Atomic Safety and Licensing Appeal Board, w/o CBechhoefer, ASLB, w/o MMCherry, Esq, w/o FPCowan, ASLB, w/o PJCook, Midland Resident Inspector, w/o RSDecker, ASLB, w/o SGadler, w/o JHarbour, ASLB, w/o GHarstead, Harstead Engineering, w/a DSHood, NRC, w/a (2)

DFJudd, B&W, w/o JDKane, NRC, w/a FJKelley, Esq, w/o RBLandsman, NRC Region III, w/a Wi[ Marshall, Esq, w/o JPMatra, Naval Surface Weapons Center, w/a W0tto, Army Corps of Engineers, w/a WDPaton, Esq, w/o SJPoulos, Geotechnical Engineering, w/a FRinaldi, NRC, w/a HSingh, Army Corps of Engineers, w/a BStamiris, w/o l

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