Letter Sequence Meeting |
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Results
Other: ML19247E427, ML19247E430, ML19247E431, ML19247E432, ML19247E433, ML19248C222, ML19350D685, ML19350D686, ML20004B075, ML20008F881, ML20033A354, ML20042C115, ML20042C117, ML20042C118, ML20042C120
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MONTHYEARML19248C2221980-10-29029 October 1980
Provides Insights on Overcooling Transients in Plants W/B&W Nsss.Frequency of Overcooling Transients Diminishes Prior to Commercial Operations.Summary of Overcooling Events Encl
Project stage: Other
ML19247E4321981-03-0303 March 1981
Provides fracture-mechanics Parametric Analysis of Overcooling Accident at Facility,In Response to Request
Project stage: Other
ML19247E4331981-04-10010 April 1981
Updates Re Safety Implications of Control Sys & Dynamic Characteristics of Nuclear Facilities.Pressurized Thermal Shock Phenomena & Control Sys Implications to Safety Have Not Been Analyzed
Project stage: Other
ML20042C1171981-04-11011 April 1981
Plant Shutdown & Cooldown, Revision 19
Project stage: Other
ML19247E4301981-04-21021 April 1981
Forwards Preliminary Assessment of Frequency of Excessive Cooldown Events Challenging Vessel Integrity,In Response to 810417 Request
Project stage: Other
ML19247E4311981-04-21021 April 1981
Forwards Modified Table 1 to 810421 Memo.Further Consideration of B&W Two Bus Design W/Failure of Single Bus Has Led to Revision of HEP
Project stage: Other
ML19247E4271981-04-28028 April 1981
Forwards Preliminary Assessment of Thermal Shock to PWR Reactor Pressure Vessels,In Response to 810416 Memo
Project stage: Other
ML19350D6861981-04-30030 April 1981
EPRI Research on Properties of Irradiated Matl Pertinent to Overcooling Transients
Project stage: Other
ML20008F8811981-05-0505 May 1981
Informs That Data Presented in BAW-1511 P, Radiation- Induced Reduction & Charpy Upper-Shelf Energy of Reactor Vessel Welds, Is Applicable to Facility.Completion of Work in Other Phases of Program Will Justify Plant Operation
Project stage: Other
ML19350D6831981-05-12012 May 1981
Forwards Ltr Rept in Response to NRC 810429 Request for Addl Info Re Thermal Shock Issue.Also Forwards Summary of EPRI Programs
Project stage: Request
ML20004A4921981-05-12012 May 1981
Discusses Results of Preliminary Review of Thermal Shock to PWR Pressure Vessels.Reasonable Assurance Found That Plant Can Continue to Operate During Generic Evaluation
Project stage: Approval
ML19350D6851981-05-15015 May 1981
Ltr Rept on Reactor Vessel Brittle Fracture Concerns in B&W Operating Plants
Project stage: Other
ML20004B0751981-05-22022 May 1981
Notifies That Info Provided in Re Reactor Vessel Brittle Fracture Concerns in B&W Plants Is Applicable to Facility.Util Will Perform Further Fracture Analyses & Participate in Owners Group Activities Re Thermal Shock
Project stage: Other
ML20030A7701981-07-20020 July 1981
Notification of 810728,29 & 30 Meetings W/B&W,Westinghouse & C-E Owners Groups in Bethesda,Md to Discuss Thermal Shock to Reactor Pressure Vessel Issue
Project stage: Meeting
ML20030D6551981-08-21021 August 1981
Requests Addl Info Re Pressurized Thermal Shock to Reactor Pressure Vessels,Per Review of PWR Owners Group 810515 & Licensees 810522 Responses to NRC
Project stage: Approval
ML20033A3541981-10-30030 October 1981
Forwards NRC Evaluation of ORNL Rept on Pressurized Thermal Shock.Rept Does Not Change Previous NRC Conclusion That Probability of Occurrence of Severe Pressurized Overcooling Transients Too Low to Require Immediate Action
Project stage: Other
ML20042C1201982-03-0808 March 1982
Loss of Steam Generator Feed, Revision 16
Project stage: Other
ML20042C1181982-03-0808 March 1982
Loss of Reactor Coolant/Rcs Pressure, Revision 17
Project stage: Other
ML20042C1151982-03-17017 March 1982
Responds to NRC & Submits Addl Info Re NUREG-0737 Item II.K.2.13, Thermal Mechanical Rept. Procedures Re Plant Shutdown & Cooldown,Loss of Reactor Coolant/Reactor Coolant Pressure & Loss of Steam Generator Feed Encl
Project stage: Other
ML20054H6621982-06-21021 June 1982
Comments on Proposed Regulatory Position Re Pressurized Thermal Shock,As Discussed at 820609 Meeting W/Nrc.Programs Undertaken to Prevent Overcooling,Following 780320 Event, Also Discussed
Project stage: Meeting
1981-05-12
[Table View] |
Text
- SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 S Street, Box 15830, Sacramento, California 95813; (916) 452-3211
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June 21, 1982 MR Hff0LD P. DENTON DIRECTOR OFFICE OF NUCLEAR REACTOR REGULATION U S NUCLEAR REGULATORY COMMISSION WASHINGTON D C 20555 DOCKET 50-312 RANCHO SEC0 NUCLEAR GENERATING STATION UNIT NO 1 PRESSURIZED THERMAL SH0CK CONSIDERATIONS The Sacramento Municipal Utility District is a member of the B&W Owners' Group and has been active in the Owners' Group Subcommittee for Reactor Vessel Materials.
This Subcommittee has met with the staff on several occasions to discuss a program for resolving pressurized thermal shock concerns.
At a meeting on June 9, 1982, held with the entire nuclear industry, you requested input on a regulatory positicn that the staff is considering for this issue. The Owners' Group Subcommittee has submitted comments on this position, which we fully endorse.
As you are aware, the B&W Owners have undertaken a program for plant spe-cific evaluations of the thermal shock issue and results indicate that there is no near-term safety problem at B&W designed plants.
In addition, programs have been undertaken or will be undertaken to reduce the possibility of overcooling events at Rancho Seco Unit No. 1.
For example, following the March 20, 1978 cooldown event at Rancho Seco, we made significant modifications to the nonnuclear instrumentation power supplies to prevent this type of event from happening again. We are also installing a safety grade control system for the auxiliary feedwater system which will prevent overcooling events resulting from overfeed situations. We also feel that a relatively complex item such as thermal shock cannot be realistically evaluated by focusing on a single para-meter such as RTNDT. We feel that time is available to carefully consider any regulatory position and are willing to work with the staff individually and through the B&W Owners' Group to ensure that Rancho Seco can continue to oper-ate safely.
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- w. w John'. Mattimoe Assistant General Manager and Chief Engineer 8206240309 820621 PDR ADOCK 05000 P
Ah ELECTRIC SYSTEM SERVlNG MORE THAN 600,000 IN THE HEARI 0F cal!F0RNIA