Letter Sequence RAI |
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Results
Other: ML19210C119, ML19247B236, ML19250A524, ML19250A528, ML19257B027, ML19260C126, ML19260C878, ML19309A657, ML19309B061, ML19309B071, ML19317G911, ML19317G973, ML19317G984, ML19330B670, ML19332A733, ML19337A632, ML19345F375, ML20148E958
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MONTHYEARML19319E1821976-08-12012 August 1976
Requests Info Re Facility Vulnerability to Plant Operation & Equipment Failures During Degraded Grid Voltage Conditions Similar to Millstone 2 Jul 1976 Occurrence.Description of Millstone 2 Event & Request for Addl Info Encl
Project stage: RAI
ML19309B0611976-09-17017 September 1976
Responds to NRC 760812 Info Request Re Grid Voltage Degradation Effects on Class IE Electrical Distribution Sys. Defines Facility Operating Limits Established by Grid Stability Analysis & Discusses Electrical Sys Capabilities
Project stage: Other
ML19317G8981977-06-0303 June 1977
Forwards NRC Safety Evaluation & Model Tech Specs Re Emergency Power Sys.Util Requested to Submit OL Amend Application Incorporating Tech Specs Comparable to Model Tech Specs
Project stage: Approval
ML19317G9111977-06-0303 June 1977
Model Tech Spec Tables 3.3,3.3-4 & 4.3-2 Re Engineered Safety Feature Actuation Sys Instrumentation & Section 4.8.1 Concerning Surveillance Requirements of Electrical Power Sys
Project stage: Other
ML19317G9731977-07-19019 July 1977
Responds to NRC 770603 Info Request.Discusses Facility Second Level Voltage Protection,Undervoltage Scheme Mods, Emergency Bus Load Shedding Features & Tech Spec Test Requirement Demonstrating Onsite Power Source Operability
Project stage: Other
ML19317G9841977-10-10010 October 1977
Responds to NRC 771005 Telcon.Submits Util Schedule for Emergency Power Sys Redesign Work,Tech Spec Mod & Mod Completion
Project stage: Other
ML19309B0711978-01-0909 January 1978
Discusses Commitment to Installation During Aug-Sept 1978 Refueling Outage of Second Level Voltage Protection Sys for Nuclear Svc Buses W/Coincident Logic Per NRC
Project stage: Other
ML19309A6571978-06-20020 June 1978
Proposed Amend 51 to License DPR-54.Includes Tech Specs 4.1 Re Instrument Surveillance Requirements
Project stage: Other
ML19309A6551978-06-20020 June 1978
Forwards Proposed Amend 51 to License DPR-54.Tech Specs 4.1 Re Instrument Surveillance Requirements Drafted in Response to NRC 770603 Request for Review of Onsite Emergency Power Sys
Project stage: Draft Request
ML20148E9581978-10-31031 October 1978
Notifies That Util Cannot Obtain NRC Approval,Perform Calculations & Purchase New Equipment for Installation of Second Level of Voltage Protection by 1978 Refueling Outage. Proposes Mod Completion by End of 1979-80 Refueling Outage
Project stage: Other
ML19257B0271979-04-12012 April 1979
Forwards Background Info on 780916 AO at Facility & Sample Generic Ltr to Licensees Re Adequacy of Station Electric Distribution Sys Voltages
Project stage: Other
ML19242A4121979-06-26026 June 1979
Transcript of 790626 Meeting in Washington,Dc.Pp 1-55
Project stage: Request
ML19274F9791979-07-18018 July 1979
Forwards Request for Addl Info Re Degraded Grid Voltage, to Be Sent to Licensee in Order to Complete Review of 771010 Submittal.Response Required within 45 Days
Project stage: RAI
ML19208C3621979-07-23023 July 1979
Submits Contention in Support of Request for Hearing.Plant Endangers Health & Safety of Population.Sufficient Mods Have Not Been Made Re TMI.Long-term Mods Must Be Implemented Per NRC 790507 Order.Certificate of Svc Encl
Project stage: Request
ML19247B2361979-07-23023 July 1979
Requests Addl Info Re Degraded Grid Voltages.Requests Response within 45 Days
Project stage: Other
ML19250A5241979-10-15015 October 1979
Notifies of Invalidity of 770603 & 760917 Submittals Re Degraded Voltage Susceptability.Fire Protection & TMI-related Mods to 230 Kv Transmission Sys Necessitate Redesign of Safety Grade Onsite Distribution Sys
Project stage: Other
ML19250A5281979-10-15015 October 1979
Requests Extension to 791018 for Response to . Delay Caused by Need to Modify Min Expected Voltage Assumptions & Perform re-analysis
Project stage: Other
ML19254D6491979-10-16016 October 1979
Responds to 790921 Request for Review of Unnecessary Challenges to Reactor Trip & Safeguard Sys.Forwards to NRC Re Review
Project stage: Request
IR 05000312/19790211979-10-17017 October 1979
IE Insp Rept 50-312/79-21 on 790904-28.Noncompliance Noted: Physical Security
Project stage: Request
ML19253B8121979-10-17017 October 1979
Forwards Response to NRC 790808 Request for Verification of Adequacy of Offsite Power Sys & Onsite Electrical Distribution Sys.Existing Sys Will Be Adequate W/Normal Plant Lineup After Implementation of Mods
Project stage: Request
ML19210C1191979-11-0202 November 1979
RO 79-13:on 790808,reanalysis of Switchyard Voltage Indicated That Present Setpoint for Bus Unloading Is Insufficient to Prevent Nuclear Svcs Busses from Decreasing Below 75% Rated Voltage.Undervoltage Relay Changed
Project stage: Other
ML19210E3901979-11-26026 November 1979
Submits Followup Request for Extension from 791105 to 791117 for Completion of Mods Re Degraded Voltage Conditions
Project stage: Request
ML19260C1261979-12-0606 December 1979
Corrects Util Re Max Experience Switchyard Voltage.District Changed Setpoint of Existing Overvoltage to 241 Kv During 791117 Outage.Operation at 241 Kv Acceptable
Project stage: Other
ML19260C8781980-01-24024 January 1980
Submits Clarification of Util Status on Degraded Voltage Mods.Will Submit Second Level Coincident Logic Design W/ Required Supporting Analysis & Documentation for Review, Comment & Approval by 800303
Project stage: Other
ML19305D7101980-04-0808 April 1980
Responds to NRC Request for Info to Suppl 791017 Response to NRC Re Grid Voltage Degradation.Info Will Be Submitted by 800425
Project stage: Request
ML19330B6701980-08-0101 August 1980
Forwards Revised Response to Inquiry on Adequacy of Facility Safety Grade Electrical Distribution Sys Voltage Since Condition Discovered at Millstone Unit 2.Util Is Planning to Implement Mod to Sys During 810601 Refueling Outage
Project stage: Other
ML19332A7331980-09-0303 September 1980
Requests Addl Info Re Adequacy of Station Electrical Distribution Sys Voltage
Project stage: Other
ML19337A6271980-09-22022 September 1980
Forwards Response to NRC 800903 Request for Info Re Adequacy of Station Electrical Distribution Sys Voltage
Project stage: Request
ML19337A6321980-09-22022 September 1980
Safety Evaluation & Statement of Staff Positions Relative to Emergency Power Sys for Operating Reactors
Project stage: Other
ML19305F2481980-12-0404 December 1980
Safety Evaluation Re Degraded Grid Voltage Protection for Class IE Power Sys at Facility.Proposed Design Mods & Changes to Tech Specs Are Acceptable
Project stage: Approval
ML19345F3691981-02-0202 February 1981
Application for Proposed Amend 51,Revision 1,to Ol.Forwards Proposed Tech Spec Changes.Changes Include All Items Submitted in Proposed Amend 51 Submitted on 780620 & Revisions Agreed to by
Project stage: Request
ML19345F3751981-02-0202 February 1981
Tech Spec Pages 4-34,4-34a,4-7b,3-41,3-42,3-43,3-44,3-41a & 3-41b Re Emergency Power Sys Periodic Testing & Auxiliary Electrical Sys
Project stage: Other
1979-11-26
[Table View] |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION y
g WASHINGTON. D. C. 20555 E,
l s., * * " * /
JUL 181979 MEMORANDUM FOR:
R. Reid, Chief, Operating Reactors Branch f4, Division of Operating Reactors FROM:
G. Lainas, Chief, Plant Systems Branch, Division of Operating Reactors
SUBJECT:
RANCHO SECO UNIT 1, REQUEST FOR ADDITIONAL INFORMATION FOR DEGRADED GRID VOLTAGE'(TAC 10968)
Plant Namei Rancho Seco, Unit 1 Docket No.: 50-312 Responsible Branch: ORB #4 Project Manager:
D. Garner Reviewing Branch:
Plant Systems Branch Status : Awaiting Infonnation In response to technical assistance request TAC 10968, the Plant Systems Branch has reviewed the licensee's submitta': of October 10, 1977 and found:that additional information is required in order to complete our review.
The attached request for additional information should be fon<arded to the licensee as soon as possible with a request for response within 45 days.
G. Lainas,
'ef, Plant Sys g Branch Division or Operating Reactors
Contact:
S. Rhow, X28077 J. Ibarra, LLL
Enclosure:
As stated cc w/ enclosure:
See next page 790827096 7
[ N C-W U %
z cc w/enclos6re:
D. Eisenhut W. Gamill B. Grimes D. Garner G. Lainas D. Tondi M. Chiramal P. Shemanski S. Rhow J. Ibarra, LLL 4
0
REQUEST FOR ADDIj'nNAL INFORMATION RANCHO SECO fl.
DEGRADED GRID VOLTAGE (TAC 10968) 1.
The voltage monitors shall be designed to meet all the requirements of IEEE Std. 279-1971.
Your letter dated January 9,1978, stated that seismic and quality assurance requirements will be met.
Des-cribe how your proposed undervoltage protection scheme complies with other design criteria of the standard.
2.
In your submittal of September 17, 1976, item lg had stated that the continuous operation range of 4160V rated motors is 3744 to 4576 Volts and that of the 460V motors is 414 to 566 volts.. Submit your analysis to show how the one level undervoltage protection (Table 3.5.3 of your letter dated June 20, 1978 gives a setpoint of 3536V + 36V with a time delay of 2.75 seconds + 0.?5 secondd assures teat the safety related equipment is not sedected voltages that could The rcalysis should also address cause damage to the equipment.
r how the proposed time delay will preciude spurious trips for short duration degradation and motor starting voltage conditions.
G
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