ML20041C138
| ML20041C138 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 02/16/1982 |
| From: | Jackie Cook, Mooney J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20041C139 | List: |
| References | |
| 15978, NUDOCS 8202260255 | |
| Download: ML20041C138 (2) | |
Text
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CORSum815.
Power James W Cook Company v,,,~,u,.,- ~ w,,.c #,,+,
and Cons,rs, tion General offices: 1945 West Pernell Road, Jackson, MI 49201 e (517) 789-0463 February 16, 1982-h.
IiECkt.i.D
.h 9
y pEB Harold R Denton, Director
[#
2O/Sg j Of fice of Nuclear Reactor Regulation q.
US Nuclear Regulatory Commission Washington, DC 20555
/
g MIDLAND PROJECT MIDLAND DOCKET NOS 50-329, 50-330 EVALUATION REPORT FOR CONCRETE CRACKS IN THE DIESEL GENERATOR BUILDING FILE 0485.16 SERIAL 15978 ENCLOSURE: EVALUATION OF THE EFFECT ON STRUCTURAL STRENGTH I
-OF CRACKS IN THE WALLS OF THE DIESEL GENERATOR BUILDING.
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, Consumers Power agreed to provide the NRC with an evaluation of the significance of concrete cracks relative to the design strength'of the diesel generator buildings.
In response to this commitment, we are providing the enclosed. report entitled
" Evaluation of the Effect on Structural Strength of Cracks in the Walls of the U
-Diesel Generator Building". by Dr. - Mete - Al Sozen, Professor of Civil Engineering -
at the University of' Illinois-Urbana. We also call your attention,to of the enclosed report which was contributed by Messrs.'W G Corley and A E Fiorato of Construction Technology Laboratories, a Division of the Portland Cement Association. Both Dr. M A So7-n =2d Dr W G Corley are members of the.American Concrete Institute (ACI) Committee 318 on standard l
building code. The enclosed reportipresents an evaluation of the significance-
-of the cracks observed in the diesel generator building. The information,
. measurements and test data presented in the enclosed report lends further i.
support to our conclusion that:
- 1..'At an intermediate construction stiage with the footing resting on the duct bank, normal horizontal tensile stresses in the walls would have caused the cracks near-the duct banks, if those cracks had not occurred earlier in fresh concrete.
- 2.. There is no evidence to indicate that the strength of the building is less j
than that assumed in its design.
(W' oc0282-0026a100 8202260255 820216 S
PDR ADOCK 05000329 A
,m
~
2 Based upon the-information contained in the enclosed report, we wish to
~
emphasize ~that the function of the. diesel generator building is well within the range of the experience which supports the theory and practice of.
. reinforced concrete building construction. Therefore, there is no need to reanalyze the, diesel generator building using a model to reflect the effects of tensile discontinuities implied by the. concrete cracks.
MC OL Mooney Executive Manager Midland Project Office.
For J W Cook JWC/RLT/mkh 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 DSHood, NRC, w/a (2) l DFJudd, B&W, w/o l
JDKane, NRC, w/a FJKelley, Esq, w/o RBLandsman, NRC Region III, w/a WHMarshall, w/o l
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 oc0282-0026a100