ML20096C540
| ML20096C540 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 01/04/1996 |
| From: | Rybak B COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9601180045 | |
| Download: ML20096C540 (2) | |
Text
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Commonweahh litison Company d
1400 Opus place Downers Gnn e, 11.60515 2
January 4,1996 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attn: Document Control Desk
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Subject:
Quad Cities Station Unit 1 Augmented Examination of the Reactor Pressure Vessel (RPV) Shell Welds Pursuant to 10CFR50.55a(g)(6)(ii)(A)
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NRC Docker Nos. 50-254 In accordance with 10CFR50.55a(g)(6)(ii)(A), Qurd Cities Station plans to conduct an augmented j
examination of the Unit 1 reactor pressure vessel (RPV) shell welds during the upcoming refuel outage Q1R14, currently scheduled to begin in February 1996. Quad Cities Station expects that less than 90% of the examination volume of RPV shell welds (ASME Section XI, Category B-A, Item Bl.10 shell welds) will be achieved using currently available remote examination technology. Less than 90% examination volume does not satisfy the augmented examination requirements for the RPV shell welds. However, subsection 6(ii)(A)(5) allows licensees unable to satisfy this augmented examination requirement to propose an alternative that provides an acceptable level of quality and safety.
Pursuant to the rules of subsection 6(ii)(A)(5), Quad Cities Station proposes the following i
examination plan for RPV shell welds (Item Bl.10 RPV shell welds).
PROPOSED EXAMINATION PLAN The RPV shell welds (ASME Section XI, Category B-A, Item B1.10 shell welds) will be ultrasonically examined (a) remotely from the inside of the reactor vessel to the extent possible and (b) manually from the outside of the vessel where remote inside examination is not achieved and where scheduled bioshield wall blocks rod insulation materials disassembly allows access.
The remote internal examinations will be performed in accordance with the remote ultrasonic examination procedure developed by General Electric, which was demonstrated 'at the Performance Demonstration Initiative Qualification in accordance with the rules of Appendix VIII of ASME Section XI,1992 Edition through 1993 Addenda. Based on the results of the Quad Cities Unit I reactor vessel accessibility study, examination coverage of approximately 71% of the RPV shell weld volume is possible from the inside of the vessel.
The aforementioned remote internal examinations will be supplemented by manual ultrasonic examinations that will be performed from the outside surface to the extent practical. The manual ultrasonic examinations will be performed in accordance with the rules of IWA-2230 of ASME Section XI,1989 Edition, as modified by Regulatory Guide 1.150.
A report will be submitted to the Commission for information within 90 days after the completion of the refuel outare, which will provide details on examination coverage and results.
9601180045 960104 PDR ADOCK 05000254
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Document Control Desk 2
January 4,1996 Comed requests approval of this alternative approach,as soon as possible, in order to support the upcoming Unit 1 outage scheduled to begin in February 1996.
If there are any questions penaining to this letter, please direct them to this office.
Respectfully, Wu et" i
Bob Rybak Nuclear Licensing Administrator H. Miller, Regional Administrator - RIII cc:
R. Pulsifer, Project Manager - NRR C. Miller, Senior Resident Inspector - Quad Cities l
Office of Nuclear Facility Safety - IDNS I
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