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| Issue date | From | Title | Project stage | |
|---|---|---|---|---|
| ML20151E805 | 2 February 1987 | Duquesne Light Company | Settlement of SWS Piping - Intake Structure to Valve Pit. W/Four Oversize Encls | Other |
| IR 05000412/1987002 | 9 March 1987 | Lester Tripp NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) | Resident Insp Rept 50-412/87-02 on 870117-0228.Violation Noted:Inadequate QC Insp Plan for Insps of HVAC Equipment Seismic Supports & Subsequent Bolting Deficiencies in Such Supports.Unresolved Item Also Opened Re Two PORVs | Request |
| ML20212N244 | 9 March 1987 | Duquesne Light Company Carey J | Forwards Addl Response to SER Confirmatory Item 2 Re Differential Settlements of Buried Pipes.W/One Oversize Figure | Other |
| ML20214U373 | 2 June 1987 | Tam P Office of Nuclear Reactor Regulation | Requests Addl Info on Analyses for Pipes Located Between Structures & in Embankment Slopes in Order to Complete Review of Util 861023 & 870309 Submittals,Per SER Confirmatory Issue 2 | Approval |
| ML20153E388 | 3 May 1988 | Tam P Office of Nuclear Reactor Regulation | Forwards Request for Addl Info to Suppl Util 871026 Info on Differential Settlement of Buried Pipes,For Response within 60 Days | RAI |
| ML20151E757 | 8 July 1988 | Duquesne Light Company Sieber J | Provides Info to Resolve Differential Settlement of Buried Pipes,Per NRC 880503 Request for Addl Info.W/One Oversize Encl | Request |
| ML20151Y416 | 23 August 1988 | Tam P Office of Nuclear Reactor Regulation | Forwards Request for Addl Info Re Differential Settlement of Buried Pipes.Response within 60 Days Requested | RAI |
| ML20205H196 | 24 October 1988 | Duquesne Light Company Sieber J | Provides Addl Info Re Differential Settlement of Buried Pipes,Per 880823 Request.Ratios for 30 Inch & 24 Inch Diameter Pipes Are 60 & 48,respectively.Allowable Limit of 3 Sc Obtained from 1983 ASME III Code Paragraph NC3653.2b | Other |
| ML20244C926 | 6 April 1989 | Tam P Office of Nuclear Reactor Regulation | Forwards Request for Addl Info Re Differential Settlement of Buried Pipes & to Verify That Bending Compressive Stress in Pipe Due to Reported Settlement Did Not Exceed Allowable Compressive Stress | RAI |
| ML20245H429 | 28 April 1989 | Tam P Office of Nuclear Reactor Regulation | Confirms Plan to Conduct Site Insp as Part of Efforts to Resolve Issue of Differential Settlement of Buried Pipes. Areas to Be Inspected Includes Ongoing Settlement Monitoring & Review of Settlement Data | Approval |
| ML20081M784 | 28 June 1991 | Duquesne Light Company Sieber J | Advises That Util Plans to Monitor Settlement of Alternate Personnel Access Facility & Administrative Bldg,In Response to 910410 Ser.Markers Will Be Placed on Bldgs & Bldgs Will Be Incorporated Into Periodic Survey within Next Yr | Other |