ML20211G249
| ML20211G249 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 09/24/1997 |
| From: | Pulsifer R NRC (Affiliation Not Assigned) |
| To: | Johnson I COMMONWEALTH EDISON CO. |
| References | |
| TAC-M95296, TAC-M97463, NUDOCS 9710020163 | |
| Download: ML20211G249 (3) | |
Text
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UNITED STATES 4
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NUCLEAR RECULATORY CEMMISSIEN WASHINQToN. D.C. 3066 Hoot l g a%,% g, *J September 24, 1997 Ms. Irene Johnson, Acting Manager Nuclear Regulatory Services Commonwealth Edison Company Executive Towers West III 1400 Opus Place, Suite 500 Downers Grove, IL 60515
SUBJECT:
VERIFICATION OF ADEQUATE WALL THICKNESS FOR MARK I TORUS SHELLS -
QUAD CITIES NUCLEAR POWER STATION, UNITS 1 AND 2 (TAC N05. M95296 AND M97463)
Dear Ms. Johnson:
The NRC staff is interested in obtaining information from several licensees relating to the minimum code wall thickness of the torus structure in containments with the Mark I torus structure. Torus wall thinning may have occurred as a result of corrosion of the steel shell in areas that have defective or missing coatings.
Information on the results of inspection of the Mark I torus structure in the vicinity of the torus to ring girder sup) ort welds, at the air water interface, and in submerged areas is requested. Tae wall thickness at those locations may be below the code allowable wall thickness. While UT thickness measurements would usually be made from the outside of the torus, it is important to visually inspect the condition of the coatings on the inside of the torus. The staff is requesting that Comed verify the torus wall thickness at Quad Cities, Units 1 and 2. meets the minimum wall thickness requirements. This can be accomplished by review of recent prior inspection results or by inspection of the torus structure.
The staff is requesting a report containing the minimum wall thicknesses in these locations, the method / criteria for these thicknesses, the actual thicknesses in these locations, the condition of the coatings on the inside of the torus, and the date of these measurements / observations.
If degradation has been found, the licensee should provide an assessment of the condition and j
long-term integrity of tho torus. The NRC staff requests that any available
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information be provided within 60 days of the date of receipt of this letter.
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- 1. Johnson Quad Cities Nuclear Power Station Comonwealth Edison Company Unit Nos. 1 and 2 CC:
Michael I. Miller. Esquire Document Control Desk Licensing Sidley and Austin Commonwealth Edison Company One First National Plaza 1400 Opus Place. Suite 400 Chicago, Illinois 60603 Downers Grove. Illinois 60515 Mr. L. William Pearce Station Manager Quad Cities Nuclear Power Station 22710 206th Avenue North Cordova Illinois 61242 U.S. Nuclear Regulatory Comission Quad Cities Resident Inspectors Office 22712 206th Avenue North Cordova. Illinois 61242 Chairman Rock Island County Board of Supervisors 1504 3rd Avenue Rock Island County Office Bldg.
Rock Island Illinois 61201 Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield Illinois 62704 Regional Administrator
-U.S.-NRC. Region III 801 Warrenville Road Lisle. Illinois 60532-4351 Richard J. Singer Manager - Nuclear MidAmerican Energy Company 907 Walnut Street P.O. Box 657 Des Moines. Iowa 50303 Brent E. Gale. Esq Vice President - Law and Regulatory Affairs MidAmerican Energy Company One RiverCenter Place 106 East Second Street P.O. Box'4350 Davenport. Iowa 52808'
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- 1. Johnson,
If the information is not available and an inspection is required, the staff expects the data would be taken at the next outage of sufficient duration and followed up with a report within 60 days.
If there are any questions, please call me at (301) 415-3016.
Sincerely, ist Robert M. Pulsifer, Project Manager Project Directorate 111-2 Division of Reactor Projects - lil/IV Office of Nuclear Reactor Regulation Docket Nos. 50-254, 50-265 cc:
see next page Distribution:
Docket File PUBLIC PDill-2 r/f E. Adensam EGAl R. Capra C. Moore R. Pulsifer OGC, 015B18 ACRS, T2E26
- 9. Krgp, Ril' C. Miller, RIII DOCUMENT NAME: G:\\CHNTJR\\ UAD\\ TORUS.QC is receive a copy of this document i leste,in the boat
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