Letter Sequence Other |
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Results
Other: ML19291B901, ML19291B903, ML19309G757, ML20004B639, ML20011B241, ML20011B243, ML20031C991, ML20039F146, ML20040D603, ML20041C142, ML20041C150, ML20050F889, ML20052F775, ML20052G848
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MONTHYEARML19270H4761979-07-23023 July 1979
Forwards Request for Addl Info to Be Sent to Licensee in Order to Complete Review of 770722 Submittal Re Technical Assistance Contract 10026.Response Required within 45 Days
Project stage: RAI
ML19254D1071979-09-18018 September 1979
Requests Addl Info Re Loss of Offsite Power on 770920 to Aid in Review of Offsite Power Sys Adequacy.Requests Reponse within 90 Days
Project stage: Approval
ML19250C3611979-10-30030 October 1979
Forwards Request for Addl Info on Degraded Grid Voltage Determined During Review of 770722 Submittal Re Second Level of Undervoltage Protection for Engineering Safety Feature Loads.Proposal for Tech Specs Change Required
Project stage: RAI
ML19291B9031979-12-0707 December 1979
Adequacy of Station Electric Distribution Sys Voltage
Project stage: Other
ML19291B9011979-12-0707 December 1979
Forwards Rept Adequacy of Station Electric Distribution Sys Voltage
Project stage: Other
ML19290E0331980-02-13013 February 1980
Forwards Request for Addl Info Re Loss of Offsite Power Events.Requests Response within 90 Days
Project stage: RAI
ML19312D3491980-02-29029 February 1980
Forwards Request for Addl Info Re Adequacy of Station Electric Distribution Sys Voltage to Complete Review of
Project stage: RAI
ML19309G7571980-04-28028 April 1980
Forwards Addl Info Re Adequacy of Station Electric Distribution Sys Voltages & Replacement Pages for 791207 Rept in Response to NRC 800229 Request
Project stage: Other
ML20004B6371981-05-21021 May 1981
Application for Amend of License DPR-57 to Revise Tech Spec for Instrumentation Which Initiates Disconnection of Offsite Power Sources
Project stage: Request
ML20004B6391981-05-21021 May 1981
Tech Spec 3.2-12 for Instrumentation Which Initiates Disconnection of Offsite Power Sources
Project stage: Other
ML20031C9801981-10-0202 October 1981
Application to Amend Licenses DPR-57 & NPF-5,changing Tech Specs Re Limiting Conditions for Operation & Surveillance Requirements for Degraded Voltage Relays & Loss of Offsite Power Relays
Project stage: Request
ML20031C9911981-10-0202 October 1981
Proposed Tech Specs Re Limiting Conditions for Operation & Surveillance Requirements for Degraded Voltage Relays & Loss of Offsite Power Relays
Project stage: Other
ML20011B2431981-12-0202 December 1981
Corrected Tech Spec 4.9.A.6 for Limiting Condition for Operation & Surveillance Requirements Re Degraded Sys Voltage
Project stage: Other
ML20011B2411981-12-0202 December 1981
Forwards Corrected Tech Specs Pages 3.9-4 & 3.9-4a Re Degraded Sys Voltage,Per 811002 Amend.Typing Error Corrected.No Wording Changed
Project stage: Other
ML20039A9831981-12-0707 December 1981
Forwards Request for Addl Info Re Adequacy of Electric Distribution Sys Voltages.Response Requested within 30 Days
Project stage: RAI
ML20039F1461981-12-10010 December 1981
Advises That Components,Including Relays,Potential Transformers,Associated Auxiliary Relays & Power Supplies Are safety-related Equipment.Util Should Propose Tech Spec Changes That Include Surveillance of Components
Project stage: Other
ML20041C1501981-12-31031 December 1981
Station Auxiliary Sys Offsite Source Voltage Study
Project stage: Other
ML20040A9471982-01-12012 January 1982
Responds to 811207 Request for Addl Info on Electric Distribution Sys Voltages.Info Includes Test Results or Vendor Certification Re Contactor Capability for Continuous Operation at 98.2 Volts.Drawings Encl
Project stage: Request
ML20040D6031982-01-26026 January 1982
Proposed Tech Spec Pages Re Emergency Power Sys
Project stage: Other
ML20040D5991982-01-26026 January 1982
Application for Amend to Licenses DPR-57 & NPF-5 Changing Tech Specs Re Surveillance of Undervoltage Relays & Associated Components of Emergency Power Sys.Response to NRC Encl
Project stage: Request
ML20041C1421982-02-18018 February 1982
Forwards Southern Co Svcs Hatch Units 1 & 2 Station Auxiliary Sys Offsite Source Voltage Study, Clarifying Emergency Power Sys Capabilities.Assumptions 15,21 & 24 Outlined
Project stage: Other
ML20050F8911982-04-0505 April 1982
Safety Evaluation Re Adequacy of Facility Electric Distribution Sys Voltages.Design Acceptable
Project stage: Approval
ML20050F8891982-04-0505 April 1982
Notifies That Electric Distribution Sys Voltages Comply W/ General Design Criterion 17 & Are Acceptable Per 791207, 0428,1009 & 820112 Responses
Project stage: Other
ML20052F7821982-05-0606 May 1982
Safety Evaluation Supporting Amends 88 & 27 to Licenses DPR-57 & NPF-5,respectively
Project stage: Approval
ML20052F7751982-05-0606 May 1982
Amends 88 & 27 to Licenses DPR-57 & NPF-5,respectively, Amending Tech Spec Resulting from Reanalysis & Mod of Plant Sys & Components Deemed Necessary in Order to Avoid Consequences of Degraded Grid Voltage Condition
Project stage: Other
ML20052G8481982-05-14014 May 1982
Requests Remittance of Class III Fee for 811002 Application Re Degraded Grid Voltage
Project stage: Other
1981-12-02
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Similar Documents at Hatch |
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Text
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Georgia Power Company 230 Peachtree Street Post Office Box 4545 Atlanta, Georgia 30302 Telephone 404 522-6060 R. J. Kelly Georgia Power Vice President and General Manager O
Power Generaton December 7, 1979 ree sovinem edectnc system U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D. C.
20555 NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5 EDWIN I. HATCH NUCLEAR PLANT UNITS 1, 2 ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGE Centlemen:
Georgia Power Company has completed the reviews and analyses requested by your August 8, 1979, letter to all licensees.
In addition to analysis, tests were made to verify the accuracy of the analytical studies. The results of the analyses are contained in the attached report, along with the test procedure used to verify the analysis.
The analysis establishes a range of voltages from 98% to 104% of nominal offsite line voltage within which the emergency loads can safely be applied. This corresponds to a minimum starting load voltage of 75%
of nominal and a maximum of 110% of nominal for running loads, each under worst case conditions.
+
The response of the system to various scenarios has been considered in accordance with the guidelines for voltage drop calculations, and the re-sultant in-plant voltages determined.
It must be made clear that these scenarios not only depict the existing operation of the system, but also describe alternate ways of system operation. We are not constrained into a particular scenario. For each condition, methods exist to place the system in a different configuration. However, because we do model the system in various conditions, certain of these improbable scenarios can be expected to produce, without modification, unacceptable voltage conditions at the plant.
With our existing system and method of operation, the aralysis shows the voltage stays between 98% and 104%. Furthermore, no violations or potential violations of GDC-17 or voltage requirements have been discovered.
We did, however, succeed in establishing a scenario which, if adopted, could result in unacceptable voltages at some time in the future. This scenario is amenable to system modifications which would allow it to be A6 f
1581 125
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32' 7912140 u
4 b
GeorgiaPower A U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation December 7, 1979 Page Two adopted with acceptable results. We therefore conclude that operation of the Hatch units continues to be matched to system operation and that Georgia Power Company is adequately protecting operations at Plant Hatch.
Operating experience to date bears this out.
We have demonstrated the loss of boch units from the system grid within moments of each other can occur with acceptable results.
Very truly yours, R. J. Kelly RDB/mb Attachment xc: Ruble A. Thomas George F. Trowbridge, Esquire R. F. Rogers, III 1581 126
