TAC:59801: Difference between revisions
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|TAC id=59801 | |||
|site=05000267 | |||
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Latest revision as of 09:43, 23 May 2025
Request for: Approved, Closed | |
Questions Answers Results Other: 05000267/LER-1986-022, :on 860715,failure Point in 480-volt Ac Essential Bus 1 & 2 Undervoltage Relay Logic Identified. Caused by Misunderstanding of Basic Design Requirements. Designer & Independent Reviewer Reprimanded, ML20134A365, ML20135H559, ML20135H563, ML20137B356, ML20137K999, ML20137S363, ML20140H110, ML20206T734, ML20207R947, ML20212G867 | |
| From | |
MONTHYEARML20074A7561983-04-27027 April 1983
[table view]Clarifies Proposed Changes in Undervoltage Protection & Reiterates Schedule for Implementation of Design Changes & Mods.Existing non-Class IE Undervoltage Relays Will Be Retained as Protection for 4,160-volt Buses ML20212N6621985-08-31031 August 1985 Technical Evaluation Rept for Proposed Change to Operation of Ginna Fuel Pool Charcoal Filter Sys, Informal Rept ML20135H5631985-08-31031 August 1985 Truth-Analysis/Action-Reaction Review of 480-Volt Essential Bus Tie Breaker Control Scheme, Final Rept ML20135H5591985-09-13013 September 1985 Forwards Truth-Analysis/Action-Reaction Review of 480-Volt Essential Bus Tie Breaker Control Scheme, Final Rept & Provides Evaluation of Control Logic Design IR 05000267/19850171985-09-13013 September 1985 Insp Rept 50-267/85-17 on 850617-0816.Violation Noted: Failure to Rept Nine Circulator Trips in 1984 & Seven Trips in 1985 & No Differential Helium Pressure Maintained When Pcrv Pressure Above 100 Psia ML20137S3631985-09-13013 September 1985 Corrected Page 1 to Responding to 850614 Commitment to Perform Evaluation of Emergency Diesel Generator Control Logic Circuitry.Ltr Number Changed ML20134A3651985-10-23023 October 1985 Amends Correction Portion of Item 2 (286G1A & 286G1B) in Util Re Results of Proto-Power Corp Analysis Concerning Emergency Electrical Power Sys Independence ML20137B3561986-01-0303 January 1986 Informs That Design Changes Involving Emergency Diesel Generator (EDG) Control Logic Circuitry Implemented.No Single Failure Will Interfere W/Proper Operation of Redundant EDG ML20137K9991986-01-14014 January 1986 Notifies That Design Changes in Emergency Diesel Generator Control Logic Circuitry Implemented,Per 850913 Commitment. Changes Assure That Failure Will Not Interfere W/Operation of Redundant Generator.Ltr Supersedes ML20140H1101986-03-31031 March 1986 Submits Info Re Startup Check List for Automatic Operation of Emergency Diesel Generators,Sys Operating Procedure 92-04,in Response to NRC .Numbers Will Be Assigned to All Valves in Emergency Diesel Generator Rooms ML17251A7911986-03-31031 March 1986 Reactor Containment Bldg Integrated Leakage Rate Test ML20206T7341986-07-0101 July 1986 Submits Summary & Schedule of Mods to Be Performed on Emergency Diesel Generator Control Circuitry in Response to 860515 & 21 Telcons.Mods Will Be Completed Prior to Startup from Current Equipment Qualification Outage ML20213G5811986-08-0707 August 1986 Draft Review of Fort St Vrain Onsite AC Standby Power Sys W/Regards to Compliance to Single Failure Criterion & Ser 05000267/LER-1986-022, :on 860715,failure Point in 480-volt Ac Essential Bus 1 & 2 Undervoltage Relay Logic Identified. Caused by Misunderstanding of Basic Design Requirements. Designer & Independent Reviewer Reprimanded1986-08-14014 August 1986
ML20213G5641986-11-12012 November 1986 Forwards Onsite Class 1E Power Sys Design Features Review Status Rept Based on FSAR & NRC 860814 Meeting W/Licensee & Inel Draft Review of Fort St Vrain Onsite AC Standby Power.... Resolution to Problems Requested Before Restart ML20212D8641986-12-24024 December 1986 Summary of 861209 Meeting W/Util Re Plant Emergency Electrical Power Sys.Fsar Commitment Re Emergency Diesel Generators revised.Marked-up Draft Rept Re Ac Standby Power Sys Encl ML20212G8671987-01-0909 January 1987 Forwards Rev a to EE-92-0008, Engineering Evaluation of Load Shedding,Load Auto Start Prohibit,Load Sequencing,Bus Tie Breaker Alignment & Generator Breaker Closing Portions of Emergency Diesel Generator Control Circuitry ML20207R9471987-03-0606 March 1987 Rev 1 to Review of Fort St Vrain Onsite AC `Standby Power Sys Re Compliance to Single Failure Criterion & Ser ML20207R9381987-03-0606 March 1987 Forwards Rev 1 to EGG-NTA-7456, Review of Fort St Vrain Onsite AC `Standby Power Sys Re Compliance to Single Failure Criterion & Ser ML20207S6271987-03-12012 March 1987 Summary of 870210 Meeting W/Util Re Emergency Diesel Generator Electrical Independence.List of Attendees Encl 1986-12-24 | |
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