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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O ENGINEERING OFFICE WESTCOF;O, fM ~ t LH Uir TTS ~ il G17-JtC-3 1 V,
13. 3. 2. 1 M 79-104 Septcnber 26, 1979 United States Iuclear Regulatory Cc nission Washington, D. C.
20555 Attention:
Office of !!uclear Reactor Regulation Mr. Robcrt W. Reid, Chic?
Operating Reactors Branch 94 Division of Operating Recctors
References:
(a) Liccuse No. DPR-36 (rocket ::o. 50-309)
(b) US:IC letter to MYAFC dated l'ebruary 2, 1978 (c) MYAFC letter to US:RC dated February 21, 1978 (1MY 78-17)
(d) US:KC letter to HYAFC dated July 18, 1979
Dear Sir:
Subject:
Maine Yankee Reactor Cavity Annulus Seal Ring Our letter Reference (c), transmitted to you infernation relative to the reactor cavity annulus seal ring and its potential to becoce a destructive nissile in the event of a loss of coolant accident pipe break inside the reactor cavity.
Subcequent to receipt of your letter Reference (d), we have re-cvaluated the cencerns of the seal ring and determined that due to an oversite in.ur previous review the following information was not included in Refereice (c).
The reactor cavity annulus seal riag at the Maine Yankee Station has never been installed during past plant operatien and is not planncd to be installed during future operation. The seal ring is only installed during plant refuelings. After such refuelings the seal ring is rcrovcd from the cavity annulus and stored for future use.
Thus, in the event et loss of coolant accident pipe break inside the reactor cavity, the cavity seal ring cannot becore a destructive missile.
The Maine Yankee Station has never operated with the cavity seal ring installed and acccrdingly has not itposed a threat to the health and safety of the public.
This information is subnfttcd pursuant to 10CFR50.54 (f). We trust iG 2 067 2VL 7910080
<( i
United States !!uclear Regulatory Cornission September 26, 1979 Attention:
Office of Nuclear Reactor Regulation Page Two you will find this response acceptable; however, should you have any questions please feel free to contact us.
Very truly yours, MAINE YANKEE ATOMIC POUER COMPANY ttkO D. L. Vandenburgh Vice Iresident RTT/smu COMOMTEALTH OF MASSACl!USETTS)
)ss.
COUNTY OF E'ORCESTER
)
Then personally appeared before ne, D. E. Vandenburgh, who, being duly sworn did state that he is Viet President of Maine Yankee Atonic Power Company, that he is duly authorized to c::ecute and file the to e-going informatien in the narne and on the be~c.alf of Maine YarAce Atenic Power Ccapany, and that the statements therein tre true to t.he best of his knowledge and belief.
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Robert H. Crcee Notar' Public d
O My Cornission Expires
ep te: ber 14, 1984
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