ML20059F031
| ML20059F031 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities  |
| Issue date: | 08/27/1990 |
| From: | Stols R COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| GL-84-23, NUDOCS 9009110067 | |
| Download: ML20059F031 (2) | |
Text
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$ :mmonwealth' Edison C
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August 27,1990 g
u Dr. Thomas E. Murley OfYice of Nuclear Reactor Regulation
..U.S. Nuclear Re latory Commission j
Washington, D.G.- 20555 j
J ATrN: Document Control Desk
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Subject:
Quad Cities Station Units 1 and 2 Dresden Station Units 2 and 3 Reactor Level Reference Leg Modification; Generic Letter 84-23 1
L NRC Docket Nos. 50-254/265 and 50-237/24%
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References:
.(a)
Letter from G.L. Alexander to H.R. Denton p
dated December 4,1984, i
(b)
Letter from R. Stols to T.E. Murley dated August 3,1989.
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Dr. Murley:
-l Reference (a) provided our response to Generic Letter 84-23 " Reactor Vessel
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> Water Level Instrumentation in BWRs" which requested that all BWR operating j
plants furnish a description of their plans to improve reactor water level j
metrumentation. The Generic Letter specifically requested information on reference -
i leg overheating and mechanical level indication equipment replacement. Reference
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L(b) provide the latest schedule for completion of the modification to resolve the issue H
on reference leg overheating.
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~ The scope of the reference leg modification includes the addition of new ;
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E containment penetrations, condensing chambers and instrument lines from the-1 e
reactor, vessel nozzle to the vessel instrument racks located outside of the drywell.
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. Conunonwealth Edison has identified (through required design reviews) that, in order to achieve the required degree ofinstrument accuracy, pping slope orientation in ~Rical. Therefore, to achieve the accurate instrument response; the piping j
i miation should be designed based on measurements from the aa-bidA drywell
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ion. The penetrations will, therefore, be installed during the Refueling y
, described in reference (b) and the modification will be completed n the j]
iuent Refueling outage for each unit.
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9009110067 900827
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PDR ADOCK 05000254 P.
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. Dr. T.E. Murley August 27,1990 -
While other desim issues have been identified during the review process.
Coimnonwealth Edison believes that the issues can be resolved within the constraints of the revised scheduled.
The schedule for installation of the Modification is as follows:
Penetration Modification Installation
_Complation.
DresdenUnit 2 Outage 12 (10/90)
Outage 13 Unit 3 Outage 12 (3/91)
- Outage 13 Quad Cities Unit 1 Outage 11 (11/90)
Outage 12 Unit 2 Outage 11(6/91)
Outage 12 If there are any questions or comments, please direct them to me at (708) 515 7283.
Very truly yours, 9
Rita Stols Nuclear Licensing Administrator
- cc: - A.B. Davis, Regional Administrator L.N. Olshan, Project Manager 1
' B.L. Siegel, Project Manager
~ S. DuPont, Senior Resident Inspector (Dresden)
T. Taylor, Senior Resident Inspector (Quad Cities) be:
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