Letter Sequence Other |
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Results
Other: ML18086B727, ML19249B547, ML19269F078, ML19309E488, ML19337A621, ML19338E953, ML19344F186, ML19350D332, ML19350D336, ML19352A999, ML20002E376, ML20004C837, ML20004E532, ML20005B917, ML20009F141, ML20010E585, ML20030C831, ML20030C845, ML20031G095, ML20049H841, ML20052G353, ML20053D878, ML20065T584, ML20069E650, ML20077K670, ML20085A749
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MONTHYEARML19225B2971979-06-13013 June 1979
Notifies of Review of Util 770728 Submittal Re TAC 10042 & 10043,degraded Grid Voltage.Forwards Request for Addl Info
Project stage: RAI
ML19247A7701979-07-0303 July 1979
Discusses Util Re Degraded Grid Voltage Generic Issues.Forwards Request for Addl Info Re Trip Setpoint Time Delay,Voltage Monitor Verification of IEEE Requirements & Channel Functional Tests
Project stage: RAI
ML19249B5471979-08-24024 August 1979
Submits Tech Spec Mod Change Request 45 to 770728 License Amend Request Re Tables 15.3.5-1 & 15.4.1-1,& Addl Info Per NRC .Revised Tables Encl
Project stage: Other
ML19254D0751979-10-0101 October 1979
Requests Addl Info Re Loss of Offsite Power on 731013 to Aid in Review of Offsite Power Sys Adequacy.Requests Response within 90 Days
Project stage: Approval
ML19254D0781979-10-12012 October 1979
Forwards Response to 790808 Request for Addl Info Re Adequacy of Station Distribution Sys Voltages.Results of Verification Testing Described Will Be Submitted Separately After Completion of Tests
Project stage: Request
ML19269F0781979-11-16016 November 1979
Four ROs on 710413,0205,731013 & 740427 Re Partial & Total Losses of Offsite Power.Caused by Wiring Errors & Weather Conditions.No Voltage or Frequency Problems Occurred
Project stage: Other
ML19309E4881980-04-17017 April 1980
Notifies of Changes to Undervoltage Relaying for Protection Against Degraded Grid Voltage on 4160 Volt Safeguard Busses. Action Responds to NRC Request to Upgrade Circuitry Upon Review of Facility 790824 & 1012 & s
Project stage: Other
ML19344F1861980-09-0808 September 1980
Forwards Requests for Addl Info Re Adequacy of Station Electric Distribution Sys Voltages to Continue Review. Response Requested within 45 Days of Ltr Receipt
Project stage: Other
IR 05000266/19800141980-09-22022 September 1980
IE Insp Repts 50-266/80-14 & 50-301/80-14 on 800801-31. Noncompliance Noted:Failure to Comply W/Asme Section XI Code Requirements for Valve Inservice Testing,Exceeding Tech Specs Due to Improper Valve Testing on Containment Sys
Project stage: Request
ML19337A6181980-09-22022 September 1980
Proposed Change 45,modifying 770728 Request to Amend Licenses DPR-24 & DPR-27 to Incorporate Tech Spec Changes. Changes Modify Trip & Time Delay Setting for Undervoltage Protection Circuitry
Project stage: Request
ML19337A6211980-09-22022 September 1980
Tech Spec Change for Item 7 of Table 15.3.5-1 & Item 3a of Table 15.3.5-3 Re Time & Trip Delay Settings for Undervoltage Protection Sys
Project stage: Other
ML19338E9531980-09-26026 September 1980
Requests Addl 90 Days to Provide Info Re Adequacy of Station Distribution Sys Voltages Per
Project stage: Other
ML20002E3761981-01-21021 January 1981
Responds to NRC Requesting Addl Info Re Adequacy of Electrical Distribution Sys.All safety-related Sys Supplied from Either 480 Volt or 4160 Volt Sys.Electrical Sys Diagram Encl
Project stage: Other
IR 05000266/19800221981-01-21021 January 1981
IE Insp Repts 50-266/80-22 & 50-301/80-22 on 801201-31. Noncompliance Noted:Failure to Obtain New Baseline Data Following Interruption in Refueling Activities
Project stage: Request
ML0710202641981-02-25025 February 1981
Memo from Thomas Murley to Stephen Hanauer Re Diesel Generator Loading Problems Related to SIS Reset on Loss of Offsite Power
Project stage: Request
ML19345G4961981-03-26026 March 1981
Forwards Request for Addl Info for Review of Util Re Adequacy of Station Electric Distribution Sys Voltages. Requests Response within 60 Days
Project stage: RAI
ML19350D3321981-03-31031 March 1981
Amends 47 & 52 to Licenses DPR-24 & DPR-27,respectively, Reflecting Mods to Plant Equipment for Addl Assurance of Proper Functioning of safety-related Electrical & Emergency Power Sys
Project stage: Other
ML19350D3341981-03-31031 March 1981
Safety Evaluation Supporting Amends 47 & 52 to Licenses DPR-24 & DPR-27,respectively
Project stage: Approval
ML19350D3361981-03-31031 March 1981
Notice of Issuance & Availability of Amends 47 & 52 to Licenses DPR-24 & DPR-27,respectively
Project stage: Other
ML19347D9111981-04-0909 April 1981
Responds to Preliminary Results of NRC Review of Environ Qualification of safety-related Equipment.Deficiencies Cited Result from Inadequate Review of Documentation.No High Energy Lines in Normal Operation Which Could Cause Hazard
Project stage: Request
ML19352A9991981-05-30030 May 1981
Informs That Mod of Protective Relaying Unavoidably Delayed, Due to Longer than Anticipated Delivery Times for Required Replacement Relays for safety-related Electrical Distribution Buses.Anticipates Mod Completion by 810831
Project stage: Other
ML20004C8371981-06-0101 June 1981
Submits Clarification of Previous Submittals & Results of Addl Analyses Performed Re Adequacy of Electrical Distribution Sys Per 810326 Request
Project stage: Other
ML20004D1471981-06-0202 June 1981
Memo to Operating Reactor & Licensing Project Managers Re NRC Review of Emergency Procedures & Training for Station Blackout.Licensee 90-day Responses to Generic Ltr 81-04 Should Be Provided
Project stage: Approval
ML20004E5321981-06-0909 June 1981
Informs That Time Is Needed to Study Generic Info Being Developed by Westinghouse Owners Group Before Accurately Predicting Completion Date of Tasks Outlined in Generic Ltr 81-04
Project stage: Other
ML18086B7271981-07-0909 July 1981
Informs of Unacceptability of Proposed Schedule for Development & Implementation of Emergency Procedures & Training for Station Blackout.Optimal Recovery Guidelines for Station Blackout Should Be Completed Soon as Possible
Project stage: Other
ML20009F1411981-07-20020 July 1981
Requests Info Re Station Blackout,Addressing Unresolved Safety Issue A-44.Questionnaire & LER Documentation Encl
Project stage: Other
ML20030C8451981-08-20020 August 1981
Advises That Addl Info Requested in NRC Re Adequacy of Station Distribution Sys Voltages Will Be Provided by Dec 1981
Project stage: Other
ML20030C8311981-08-21021 August 1981
Forwards Completed Data Tables Re Reliability of Onsite Standby Diesel Generators,Per NRC 810720 Request Concerning Station Blackout
Project stage: Other
ML20010E5851981-08-21021 August 1981
Requests That Licensee Expedite Implementation of Emergency Procedures & Training for Station Blackout Event to Be in Effect by Sept 1981.Revised Schedule for Implementation Must Be Submitted within 20 Days
Project stage: Other
ML20005B9171981-09-11011 September 1981
Notifies That Special Order Implementing Requirements of Generic Ltr 81-04 Re Emergency Procedures & Training for Station Blackout or Loss of All Ac Power Events Will Be in Effect by 810930
Project stage: Other
ML20031G0951981-09-29029 September 1981
Approves 810911 Commitments & Schedule Re Procedures & Training for Station Blackout Events.Intention to Implement Permanent Procedures & Conduct Operator Training Per 810609 Schedule (in Response to Generic Ltr 81-04) Ack
Project stage: Other
ML20039D6141981-12-30030 December 1981
Application for Amend to Licenses DPR-24 & DPR-27,responding to NRC 811218 Telecopied Request for Addl Info on 811203 Tech Spec Change Request 74 Re Emergency Power Undervoltage Relay Protection
Project stage: Request
ML20049H8411982-02-26026 February 1982
Informs That Requested Analyses of Effects of Transient Voltages Present During Switching & Motor Starting Operations Will Be Completed by 820501
Project stage: Other
ML20052G3531982-05-14014 May 1982
Advises That Addl Info Requested 820226 Re Adequacy of Station Distribution Sys Voltages Will Be Submitted by 820601
Project stage: Other
ML20053D8781982-06-0101 June 1982
Forwards Clarification & Updated Info Re Adequacy of Station Electrical Distribution Sys Voltages Referenced in NRC .Info Combined w/810601 & 1230 Ltrs Completes Response
Project stage: Other
ML20063M5941982-09-10010 September 1982
Responds to 820813 Request for Addl Info Re Adequacy of Electrical Distribution Sys Voltages.Theoretical & Actual Voltages for safety-related Buses Listed
Project stage: Request
ML20065T5841982-10-29029 October 1982
Responds to NRC Re Adequacy of Station Electrical Distribution.Failure of Both Low Voltage Station Auxiliary Transformers Is Condition Described in Fsar,Chapter 7, Electrical Sys
Project stage: Other
ML20077K6701983-02-0909 February 1983
Adequacy of Electric Distribution Sys Voltages for Point Beach Nuclear Plant,Units 1 & 2, Technical Evaluation Rept
Project stage: Other
ML20069E6501983-03-14014 March 1983
Suppls 791012 & 810601 Responses to Requests for Addl Info Re Offsite Power Distribution Sys.Nrc Safety Analysis Concluded That Ac Auxiliary Power Sys Adequate & Physical & Electrical Separation of Power Sys Acceptable
Project stage: Other
ML20072J6891983-03-23023 March 1983
Application for Amend to Licenses DPR-24 & DPR-27,modifying 820427 Tech Spec Change Request 77 Re Loss of Voltage Protective Relays
Project stage: Request
ML20204F5251983-04-25025 April 1983
Forwards Safety Evaluation of Util Preferred Ac Power Sys Conformance to GDC 17.Power Sys Do Not Fully Meet Intent of GDC 17 Since Sys Could Be Automatically Disconnected from 4,160-volt Safeguards Buses in Worst Case Accident Loads
Project stage: Approval
ML20204F5381983-04-25025 April 1983
Safety Evaluation of Util Preferred Ac Power Sys Conformance GDC 17.Proximity of Low Voltage Transformers Does Not Fully Meet GDC 17 Requirements for Physical Separation,But Deluge Sprinkler Sys Adequate
Project stage: Approval
ML20085A7491983-06-30030 June 1983
Informs of No Significant Changes to Electrical Distribution Sys Described in FSAR Which Would Affect Degree of Conformance w/GDC-17.Available Info Adequate to Determine Intent of GDC-17 Re Offsite Power Distribution Sys
Project stage: Other
1981-06-01
[Table View] |
Text
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ntscomun Electnc macomu 231 W. MICHIGAN, P.O. BOX 2046, MILWAUKEE, WI 53201 March 14, 1983 Mr. H.
R.
Denton, Director Office of Nuclear Reactor Regulation U.
S. NUCLEAR REGULATORY COMMISSION Washington, D.
C.
20555 Attention:
Mr.
R. A. Clark, Chief Operating Reactors Branch 3 Gentlemen:
DOCKET NOS. 50-266 AND 50-301 ELECTRIC POWER DISTRIBUTION SYSTEM POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 We have been advised by Mr.
T.
Colburn of your staff that after reviewing responses dated October 12, 1979 and June 1, 1981 to requests for additional information regarding the electrical distribution system at the Point Beach Nuclear Plant, it has been determinr3d that Wisconsin Electric has not adequately addressed whether che Point Beach off-site power distribution system meets the intent of 10 CFR Part 50, Appendix A, General Design Criteria (GDC) 17.
Specifically, GDC 17 states that electric power from the transmission network to the on-site electric distribution system shall be supplied by two physically independent circuits designed and located so as to minimize to the extent practical the likelihood of their simultaneous failure under operating and postulated accident and environmental conditions.
In our previous responses we advised that the electrical distribution system at the Point Beach Nuclear Plant is described in Chapter 8 of the Final Safety Analysis Report.
As you know, the Point Beach Nuclear Plant was designed and constructed prior to the effective date of the final rule promulgating 10 CFR Part 50, Appendix A.
The proposed GDC concerning electrical distribution at the time Point Beach was designed and constructed was proposed Criteria 39 which specified that the on-site and off-site power systems shall each, independently, provide the capacity to permit 016 8303220137 830314 I
PDR ADOCK 05000266 P
PDR
O Mr. H.
R. Denton March 14, 1983 the functioning required of the engineered safety features assuming a failure of a single active component in each power system.
The off-site power distribution system also satisfies the GDC 17 requirements except for the provision that the physical separation of the independent off-site circuits should be located to minimize the potential for simultaneous failure as a result of postulated operating, accident, or environmental conditions.
Both the low voltage station auxiliary transformers, which feed power to the A03 and A04 switching busses, which in turn supply off-site power to the engineered safeguards busses, and the power supply from the plant switchyard to these transformers are located in relatively close physical proximity.
Certain operational or environmental occurrences, such as a tornado, could potentially disrupt both these circuits simultaneously, therefore, we cannot state that the provisions of GDC 17 are fully satisfied by the Point Beach electrical system design.
As discussed in our letter to you dated October 29, 1982, we have previously considered the potential consequence of a loss of both the low voltage station auxiliary transformers.
As discussed in the Point Beach Final Safety Analysis Report, no credit is taken for these transformers as a safety-related power supply.
Safety-related sources of emergency power are supplied by the two on-site emergency diesel generator sets.
We have, therefore, concluded, and the NRC safety analysis for the Point Beach Nuclear Plant written at the time of issuance of the Facility Operating Licenses concluded, that the AC auxiliary power system at the Point Beach Nuclear Plant has adequate capacity and physical and electrical separation and the off-site and on-site power distribution systems are acceptable.
Very truly yours, Cs JJ
?
Vice Presiden Nuclear Power C. W. Fay Copy to NRC Resident Inspector h
3
