Letter Sequence Other |
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Results
Other: B10079, Discusses Position on Asymmetric LOCA Loads,In Response to NRC .Reactor Cavity Seal Will Not Be Subjected to Forces Creating Missile Hazard for Max pipe-break Opening Considered in WCAP-9558 & WCAP-9558,Revision 1, ML14184A106, ML15223A533, ML15238B097, ML17174B193, ML17207A438, ML17326A274, ML17338B145, ML18079B047, ML19208D035, ML19209A772, ML19209A773, ML19209B556, ML19209B989, ML19242A701, ML19247A568, ML19247B242, ML19249E918, ML19250C244, ML19259C125, ML19259C826, ML19259D694, ML19260D661, ML19262B585, ML19275A183, ML19275A432, ML19275A437, ML19275A443, ML19275A446, ML19296A786, ML19339C073, ML19347B263, ML20003A697
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MONTHYEARML19259C1251979-06-0606 June 1979
Responds to NRC .Discusses New Design for Reactor Cavity Annulus Seal Ring Support Sys.Describes Interim Operating Procedure Until New Sys Installed
Project stage: Other
ML19247A5681979-07-0505 July 1979
Notifies of Status of Rept on Reactor Cavity Annulus Seal. Most PWR Users Remove Ring During Normal Operation.Others Store Seal Ring in Raised Position During Normal Operation
Project stage: Other
ML15245A1061979-07-18018 July 1979
Discusses Review of Re Potential of Reactor Cavity Annulus Seal Ring to Become Destructive Missile. Requests Demonstration That Seal Ring Is Not Destructive or Removal of Seal Ring No Later than Next Refueling Outage
Project stage: Approval
ML19242A7011979-07-18018 July 1979
Requests Addl Info Demonstrating That Seal Ring Cannot Become Destructive Misile During lon-term Operation or Statement That Seal Ring Will Be Removed by Next Refueling Outage
Project stage: Other
ML19259C8261979-07-19019 July 1979
Advises That 780202 Response Has Been Reviewed Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile in Loca.Requests Analysis Demonstrating Safe Conditions & Statement Re Seal Ring Removal
Project stage: Other
ML19247B2421979-07-26026 July 1979
Responds to Re Reactor Cavity Annulus Seal Ring. Requests Analysis of Seal Ring Effect on Other Containment Safety Components Should Ring Become Missile.Statement Promising Seal Ring Removal Before Next Refueling Outage
Project stage: Other
ML17244A8471979-09-0505 September 1979
Discusses Completion of Review of Response to Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile in Event of LOCA Pipe Break Inside Reactor Cavity.Response Resolves Issue
Project stage: Approval
ML18043B0421979-09-0505 September 1979
Discusses Completion of Review of Response to Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile in Event of LOCA Pipe Break Inside Reactor Cavity
Project stage: Approval
ML19275A4371979-09-11011 September 1979
Notifies That Util Response to NRC Acceptably Resolves Issue Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile During LOCA
Project stage: Other
ML19208D0351979-09-11011 September 1979
Discusses Util Re Potential for Reactor Cavity Annulus Seal to Become Destructive Missile During Loca. Removal During Operation Is Acceptable Pending NRC Approval & Installation of Seal Ring Support Sys
Project stage: Other
ML19275A4321979-09-11011 September 1979
Notifies That Util Response to NRC Acceptably Resolves Issue Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile During LOCA
Project stage: Other
ML17207A4381979-09-11011 September 1979
Notifies That Util Response to NRC Acceptably Resolves Issue Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile During LOCA
Project stage: Other
ML19275A4431979-09-11011 September 1979
Notifies That Util Response to NRC Acceptably Resolves Issue Re Potential Issue for Reactor Cavity Annulus Seal Ring to Become Destructive Missile During LOCA
Project stage: Other
ML19275A4461979-09-11011 September 1979
Notifies That Util Response to NRC Acceptably Resolves Issue Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile During LOCA
Project stage: Other
ML18079B0471979-09-18018 September 1979
Responds to Util Answer to NRC Re Reactor Cavity Seal Ring Generic Issue.Util Answer Acceptably Resolves Issue
Project stage: Other
ML17174B1931979-09-18018 September 1979
Notifies That Util Response to NRC Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile During LOCA Acceptably Resolves Problem
Project stage: Other
ML17338B1451979-09-18018 September 1979
Responds to Util Answer to NRC Re Reactor Cavity Seal Ring Generic Issue.Util Answer Acceptably Resolves Issue
Project stage: Other
ML19209A7721979-09-18018 September 1979
Responds to Util Answer to NRC Re Reactor Cavity Seal Ring Generic Issue.Util Answer Acceptably Resolves Issue
Project stage: Other
ML19209A7731979-09-18018 September 1979
Responds to Util Answer to NRC Re Reactor Cavity Seal Ring Generic Issue.Util Answer Acceptably Resolves Issue
Project stage: Other
ML17326A2741979-09-18018 September 1979
Responds to Util Answer to NRC Re Reactor Cavity Seal Ring Generic Issue.Util Answer Acceptably Resolves Issue
Project stage: Other
ML19249E9181979-09-18018 September 1979
Notifies Util That Response to NRC Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile During LOCA Acceptably Resolves Problem
Project stage: Other
ML14184A1061979-09-18018 September 1979
Notifies That Util Response to NRC Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile During LOCA Acceptably Resolves Problem
Project stage: Other
ML19275A1831979-09-26026 September 1979
Submits Addl Info Omitted from Potential of Reactor Cavity Annulus Seal Ring to Become Destructive Missile in Event of LOCA Pipe Break Inside Reactor Cavity
Project stage: Other
ML19209B5561979-09-27027 September 1979
Responds to .Reactor Cavity Seal Ring Will Be Removed from Normal Operation No Later than Next Refueling Outage.Outage Is Scheduled for May-June 1980
Project stage: Other
ML19209B9891979-09-28028 September 1979
Ack Receipt of NRC Re Reactor Cavity Annulus Seal Ring.Util Will Take Necessary Action to Preclude Seal Ring Becoming Potential Missile.Action Will Begin No Later than Fourth Refueling Shutdown Scheduled for Fall 1980
Project stage: Other
ML19259D6941979-10-0202 October 1979
Responds to 780202 Response Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile in Event of LOCA Pipe Break Inside Reactor Cavity.Response Inadequate. Must Demonstrate Safety or Remove Ring
Project stage: Other
ML19275A9151979-10-0202 October 1979
Discusses Review of Response to .Requests Demonstration That Seal Ring Cannot Become Destructive Missile During long-term Operation & That Public Health & Safety Is Not Threatened
Project stage: Approval
ML15223A5331979-10-11011 October 1979
Ack Receipt of .Ltr Did Not Provide Required Responses.Response Should Demonstrate That Seal Ring Cannot Become Destructive Missile.Info Requested within 30 Days of Ltr Receipt
Project stage: Other
ML19250C2441979-10-30030 October 1979
Informs of Resolution of Reactor Cavity Ring Seal Generic Issue
Project stage: Other
ML19254F9311979-11-0909 November 1979
Responds to 791002 Request for Info Re PWR Reactor Vessel Seal Ring Missile Problem.Seal Ring Cannot Become Destructive Missile During Continued long-term Operation & Poses No Threat to Public Health & Safety
Project stage: Request
ML19262B5851979-12-20020 December 1979
Advises That Seal Ring Should Be Removed Following Each Refueling Outage by Raising Ring More than 12 Ft Above Cavity Floor,In Response to NRC 791002 Request.Util Does Not Concur W/Nrc Belief That Ring Could Become Missile
Project stage: Other
ML19260D6611980-01-26026 January 1980
Responds to Re NRC 791002 Request to Evaluate Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile During LOCA Pipe Break Inside Reactor Cavity.No Further Action Required
Project stage: Other
ML19296A7861980-01-28028 January 1980
Accepts Util 790927 Commitment to Remove Reactor Cavity Seal Ring During Normal Operations Prior to Startup Following Next Refueling Outage.Commitment Resolves Issue Discussed in NRC
Project stage: Other
ML19260E2921980-02-0404 February 1980
Notifies That NRC Has Completed Review of Util 791220 Response Re Potential for Reactor Cavity Annulus Seal Ring to Become Destructive Missile in Event of LOCA Pipe Break Inside Reactor Cavity.Response Acceptably Resolves Issue
Project stage: Approval
ML15238B0971980-04-30030 April 1980
Notifies That Removal & Storage of Reactor Cavity Seal Ring Satisfactorily Resolves Safety Issue Identified in NRC
Project stage: Other
ML19316A8251980-05-0808 May 1980
Advises That Review of of 790926 Response to NRC Re Potential Destructive Consequence for Annulus Seal Ring in Event of LOCA Pipe Break Is Complete.Decision Not to Use Seal Ring Except During Refueling Is Acceptable
Project stage: Approval
ML19347B2631980-09-29029 September 1980
Responds to Re Proposed Reactor Cavity Annual Seal Plate Storage.Relocation to Storage Area Remote from Differential Pressures Generated within Reactor Cavity Following Postulated LOCA Is Acceptable
Project stage: Other
ML18139A5651980-09-30030 September 1980
Responds to NRC Request for Updated Status Rept on Reactor Vessel Flange Seal Ring Analysis.Westinghouse Owners Group Study Offers Rationale for Not Requiring Installation of Pipe Break Restraints
Project stage: Request
B10079, Discusses Position on Asymmetric LOCA Loads,In Response to NRC .Reactor Cavity Seal Will Not Be Subjected to Forces Creating Missile Hazard for Max pipe-break Opening Considered in WCAP-9558 & WCAP-9558,Revision 11980-10-0303 October 1980
Discusses Position on Asymmetric LOCA Loads,In Response to NRC .Reactor Cavity Seal Will Not Be Subjected to Forces Creating Missile Hazard for Max pipe-break Opening Considered in WCAP-9558 & WCAP-9558,Revision 1
Project stage: Other
ML19339C0731980-10-30030 October 1980
Verifies That Seal Ring Has Been Removed from Cavity Annulus Area & Is Not Potential Missile Hazard.Concludes That Safety Issue Has Been Satisfactorily Resolved
Project stage: Other
ML20003A6971981-01-21021 January 1981
Notifies of Satisfactory Resolution of Safety Issue Re Potential for Reactor Cavity Annulus Seal Ring or Biological Shielding within Reactor Cavity to Become Missile in Event of LOCA
Project stage: Other
1979-09-26
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Text
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'o, UNITED STATES I '$,3 4.
i NUCLEAR REGULATORY COMMISSION c
WASHINGTON, D. C. 20555 o,
WEPTEMBER 13 W9 Docket Nos. 50-282 and 50-306 Mr. L. O. Mayer, Manager Nuclear Support Services Northern States Power Company 414 Nicollet Mall - 8th Floor Minneapolis, Minnesota 55401
Dear Mr. Mayer:
RE:
REACTOR CAVITY SEAL RING GENERIC ISSUE (PWR)
We have completed our review of your response to our letter of February 2, 1978, in regard to the potential for the reactor cavity annulus seal ring to become a destructive missile in the event of a loss-of-coolant accident pipe break inside the reactor cavity.
Your response acceptably resolves this issue for Prairie Island Nuclear Generating Station, Unit Nos.1 and 2.
Sincerely /
I g
ayVMO A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors cc:
See next page 7910050 3 6 o jj26 2/6
4 tir. L. O. Mayer Northern States Power Company cc:
Gerald Charnoff, Esquire Shaw, Pittman, Potts and Trowbridge 1800 M Street, N.W.
Washington, D. C.
20036 Sandra S. Gardebring Executive Director Minnesota Pollution Control Agency 1935 W. County Road 82 Roseville, Minnesota 55113 The Environmental Conservation Library Minneapolis Public Library 300 Nicollet Mall Minneapolis, Minnesota 55401 Mr. F. P. Tierney, Plant Manager Prairie Island Nuclear Generating Plant Northern States Power Company Route 2 Welch, Minnesota 55089 Joclyn F. Olson, Esquire Special Assistant Attorney General Minnesota Pollution Control Agency 1935 W. County Road B2 Rosevil:e, Minnesota 55113 Robert L. Nybo, Jr., Chairman Minnesota-Wisconsin Boundary Area Commission 619 Second Street Hudson, Wisconsin 54016 Clarence D. Fierabend U. S. Nuclear Regulatory Commission P. O. Box 374 Red Wing, Minnesota 55066 1126 2/7
