ML20155B285
| ML20155B285 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 09/28/1988 |
| From: | Trzyna G COMMONWEALTH EDISON CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| 5081K, NUDOCS 8810060256 | |
| Download: ML20155B285 (1) | |
Text
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f x Cornnionwealth Edison
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one FC Naxnal Ptara. CNcago, lanos
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) Address Reply to. Post Off.co 06T76F T
\\s_, / Chca@11mm>s E690 0767 September 28, 1988 Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Station P1-137 Washington, DC 20555
Subject:
Zion Nuclear Power Station Units 1 and 2 License Nos. DPR-39 and DPR-48 Reactor Vessel-PTS Evaluation NEC_DQCktLNo t a_h29LonOO-lQ.4 References February 26, 1988 letter from D.R. Muller to L.D. Butterfield Gentlemen The referenced letter provided a chronicle of the NRC and Commonwealth Edison data exchanges that have occurred regarding the PTS lasue for Zion Station. The current status of the issue indicates that a disagreement exists between CECO and NRC in the treatment of the subsequent I
valueJ of the copper and nickel content of the Unit I reactor vessel.
Edison's analysis was rejected and a further analysis was encouraged only if new information was presented.
Finally, it was suggested that Commonwealth Edison should submit pison for a Unit 1 flux reduction program.
Commonwealth Edison is identifying and avaluating the steps that could be taken to implement a flux reduction pl ogram for Unit 1.
These programs are dependent upon specific reactor de> signs and fuel configuration.
An evaluation of the optimum measure or measures will be performed to determine if fuel management, shleiding or othe r flux reduction technique may be implemented.
We were disappointed that the staff was not persuaded by our analysis and statistical treatment of the data. We are re-examining our position and are ir. tending to obtain new data from sources available through our participation in the B&W Owner's Group and through research conducted on the Midland pressure vessel.
The results of these further inquiries might enable us to resolve the differences between our present positions.
He will keep the NRC apprised of our efforts and would be available to discuss the issues at a future date.
Very truly yours, y
G.E. Trayna Nuclear Licensing Administrator j
Zion Station rf cci J. Nerris 0\\
Zion-Resident Inspector 0
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