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MONTHYEARML19289C9691979-01-18018 January 1979
Forwards Request for Addl Info Re Onsite Emergency Power Sys to Complete Review of Protection from Degraded Grid Voltage Conditions.Requires Response within 30 Days
Project stage: RAI
ML19263C8871979-03-0707 March 1979
Forwards Replies to Request for Addl Info Re Voltages on Safety Related Station Svc Electrical Buses.New Undervoltage Protection Will Be Installed & in Svc by Dec 1980.W/encl Appropriate Affidavit
Project stage: Request
ML19242A3091979-07-0202 July 1979
Responds to Util 790307 Request for Technical Assistance Re Degraded Grid Voltage.Addl Info Required by NRC to Complete Review.Request for Addl Info Encl
Project stage: RAI
ML19247B8501979-07-0505 July 1979
Requests Addl Info for Review of Degraded Grid Voltages on safety-related Station Electrical Buses
Project stage: Approval
ML19207C1671979-09-0404 September 1979
Notifies That Responses to on Degraded Grid Voltages & Re Adequacy of Station Electric Distribution Sys Voltages Are Currently Under Study & Will Be Forwarded by 791008
Project stage: Other
ML19209C8401979-10-15015 October 1979
Forwards Info Re Station Svc Bus Voltages,In Response to 790705 & 0808 Requests
Project stage: Other
ML19291C2191980-01-17017 January 1980
Advises of Delay in Completion of Voltage Study Re Station Svc Bus Voltage Conditions.Results of Study & Proposed Tech Specs Associated W/New Undervoltage Relays on Class IE 4160-volt & 480-volt Buses to Be Completed by 800215
Project stage: Other
ML19323C5621980-05-14014 May 1980
Application for Amend 46 to Ol,Providing Proposed Tech Spec Changes.Revisions Include Addition of safety-related Hydraulic Snubbers to Table 3.7-4 & Mod of Surveillance Requirements for Auxiliary Feedwater Sys.Affidavit Encl
Project stage: Request
ML19323C5641980-05-14014 May 1980
Proposed Tech Spec Changes.Provides for Addition of safety-related Hydraulic Snubbers to Table 3.7-4 & Mod of Surveillance Requirements for Auxiliary Feedwater Sys
Project stage: Other
ML19330A8481980-07-24024 July 1980
Documents Verbal Responses to NRC Questions Re Station Svc Bus Undervoltage Relays
Project stage: Other
ML20002A5461980-10-31031 October 1980
Degraded Grid Protection for Class IE Power Sys,Beaver Valley Power Station, Technical Evaluation Rept
Project stage: Other
ML20039B6541981-12-15015 December 1981
Advises of Revised Design Concept Which Calls for Installation of New Station Svc Transformers Equipped W/Automatic Tap Changing Secondary Capability.Installation Scheduled for Refueling Outage Beginning 820101
Project stage: Other
1979-09-04
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'Af (412) 456-6000 435 S.sta Avena 9 ftsburgi Ps 152t9 January 17, 1980 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attn:
A. Schwencer, Chief Operating Reactors Branch No. 1 Division of Operating Reactors Washington, DC 20555
Reference:
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Station Service Bus Voltage Study Gentlemen:
In our October 15, 1979, response to requests for information on station service bus voltages, we indicated computer analyses were being performed to determine the station service bus voltage conditions that might exist during the relatively short periods of time required to start accelerate to running speeds various combinations of motor driven station equipment.
The completion of this voltage study has been delayed, but we expect to complete
'.t by February 15, 1980, at which time we will submit the results of the :, dy and proposed Technical Specifications aserciated with the new undervoltage relays on the Class lE 4160 volt and 480 volt buses.
We plan to complete the installation of the new undervoltage relays and the corrective measures for the undervoltage condition during the current major modification and refueling outage. We anticipate the corrective measures for the undervoltage will be in the form of capacitors connected to the normal, non-safety related, 4160 volt station service buses.
Should we determine that these capacitors must be connected to these buses to prevent the occurrence of degrated voltage conditions en the safety related buses for periods of time that could result in damage to essential safety related equipment, we will provide proposed limiting conditions for operation related to these capacitors.
Very truly yours, C. N. Dunn Vice President, Operations A
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