Letter Sequence Other |
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Results
Other: 05000206/LER-1988-009, :on 880526,potential Diesel Loads in Excess of Regulatory Commitments.Caused by Calculation Errors & Inadequate Understanding of Loads on Diesel Generator. Personnel Trained in Proper Methodology, 05000206/LER-1988-009-01, :on 880526,determined That Max Electrical Load Imposed on Diesel Generators in Excess of Tech Spec 4.4 Limit.Cause Under Investigation.Members Involved Have Reviewed Event & Received Training, ML13316A938, ML13316B046, ML13322A027, ML13322A030, ML13324A861, ML13330B319, ML13330B351, ML13330B354, ML13330B356, ML13331B056, ML13331B057
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MONTHYEARML13324A8611986-05-19019 May 1986
Forwards Results of Insps Performed on Emergency Diesel Generator 1 on Nov 1985 - Feb 1986,per Tdi Diesel Generator Owners Group Feb 1985 Rept Recommendation.Rept on Emergency Diesel Generator 2 Will Be Submitted by 860613
Project stage: Other
ML13316A9351986-07-0303 July 1986
Forwards Amend 95 to License DPR-13 & Safety Evaluation. Amend Modifies Tech Specs to Incorporate Load Limitations for Emergency Diesel Engine Testing & Monthly Surveillance Test Conditions
Project stage: Approval
ML13316A9381986-07-0303 July 1986
Amend 95 to License DPR-13,modifying Tech Specs to Incorporate Load Limitations for Emergency Diesel Engine Testing & Monthly Surveillance Test Conditions
Project stage: Other
ML13316A9391986-07-0303 July 1986
Safety Evaluation Supporting Amend 95 to License DPR-13
Project stage: Approval
ML13330B3191988-05-27027 May 1988
Forwards Sixth Edition of Integrated Implementation Schedule (Iis) Per License Condition 3.J,providing Update on Changes & Progress Re Mods Scheduled for Cycle X.Schedule Rev for Cycle XI & Later Outages Planned for Next IIs Edition
Project stage: Other
ML13322A0271988-06-17017 June 1988
Rev 2 to Design Calculation for Emergency Diesel Generators Loading DC 1809
Project stage: Other
IR 05000206/19880131988-06-22022 June 1988
Insp Repts 50-206/88-13,50-361/88-11 & 50-362/88-11 on 880410-0521.No Violations Noted.Major Areas Inspected: Operational Safety Verification,Evaluation of Plant Trips & Events & Monthly Surveillance & Maint Activities
Project stage: Request
05000206/LER-1988-009-01, :on 880526,determined That Max Electrical Load Imposed on Diesel Generators in Excess of Tech Spec 4.4 Limit.Cause Under Investigation.Members Involved Have Reviewed Event & Received Training1988-06-27027 June 1988
- on 880526,determined That Max Electrical Load Imposed on Diesel Generators in Excess of Tech Spec 4.4 Limit.Cause Under Investigation.Members Involved Have Reviewed Event & Received Training
Project stage: Other
ML13330B3511988-07-15015 July 1988
Forwards Design Calculation for Emergency Diesel Generator Loading DC-1809,Rev 2 & Do Harris
Project stage: Other
ML13331B0571988-07-19019 July 1988
Forwards Evaluation of Motors Operating in Overload Condition Committed to in in Support of NRC Review of Amend Application 153
Project stage: Other
ML13330B3541988-07-21021 July 1988
Forwards Westinghouse Rept 88-13, Charging Pump Motor Overload Evaluation. Rept Concludes That These Motors Will Perform Satisfactorily Under Accident Conditions
Project stage: Other
ML13316B0461988-07-22022 July 1988
Amend 104 to License DPR-13,approving Diesel Generator Rating of 5,250 Kw for Both Generators Until Next Refueling Outage Provided That Main Journal Bearings Inspected Prior to Plant Operation & Found to Be Free of Cracks
Project stage: Other
ML13316B0481988-07-22022 July 1988
Safety Evaluation Supporting Amend 104 to License DPR-13
Project stage: Approval
ML13331B0561988-07-22022 July 1988
Addresses Util Plans for Long Term Resolution of Concern Re Operation of Charging Pump Motors in Overload Condition During post-accident Operation & Justification for Continued Operation,Per NRC Review of Amend Application 153
Project stage: Other
ML13316B0431988-07-22022 July 1988
Forwards Amend 104 to License DPR-13 & Safety Evaluation. Amend Approves Diesel Generator Rating of 5,250 Kw for Both Generators Until Next Refueling Outage Provided Main Journal Bearings Inspected Prior to Plant Operation
Project stage: Approval
ML13336A1021988-07-27027 July 1988
Summary of 880711 Meeting W/Util Re Uprate of Emergency Diesel Generators from 4,500 to 5,250 Kw,Per Util Insp of Generators.List of Attendees & Figures Encl
Project stage: Meeting
ML13322A0301988-07-31031 July 1988
Influence of Reduced Peak Firing Pressure on Fatigue Performance of Modified-AF Piston Skirts at San Onofre,Unit 1
Project stage: Other
ML13330B3561988-07-31031 July 1988
Charging Pump Motor Overload Evaluation
Project stage: Other
05000206/LER-1988-009, :on 880526,potential Diesel Loads in Excess of Regulatory Commitments.Caused by Calculation Errors & Inadequate Understanding of Loads on Diesel Generator. Personnel Trained in Proper Methodology1988-11-0303 November 1988
- on 880526,potential Diesel Loads in Excess of Regulatory Commitments.Caused by Calculation Errors & Inadequate Understanding of Loads on Diesel Generator. Personnel Trained in Proper Methodology
Project stage: Other
1988-06-27
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Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 M.O.MEDFORD TELEPHONE MANAGER OF NUCLEAR ENGINEERING (18) 302-1749 AND LICENSING July 22, 1988 U. S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C. 20555 Gentlemen:
Subject:
Supplement to Amendment Application No. 153 Docket No. 50-206 San Onofre Nuclear Generating Station Unit 1 As a result of the NRC review of Amendment Application No. 153, the NRC staff has expressed a concern regarding operation of the charging pump motors in an overload condition during post-accident operation. Additional information, including an evaluation by Westinghouse Electric Corporation, was provided by letters dated July 19 and 21, 1988. The purpose of this letter is to address SCE's plans for long term resolution of this issue and SCE's justification for continued operation in the interim.
SCE has requested that Westinghouse evaluate the design rating of these motors. Based on a preliminary review, because of the margin in the original design, Westinghouse expects to be able to certify a higher nameplate rating for these motors. Specifically, at this time they anticipate rerating these motors to 700 horsepower with a service factor of 1.15. Therefore, the motors will be operating within their nominal nameplate rating during normal operating and long term recirculation conditions. In addition, during the initial 5 1/2 hours after a postulated accident when a higher load is required, the motors will be operating within the service factor of 1.15.
Based on the acceptability of the results of Westinghouse's evaluation described above, within 60 days SCE will provide a certification of the charging pump motors to at least 700 horsepower with a service factor of 1.15. If the evaluation is unsuccessful, SCE will provide motors with NEMA rating of 800 horsepower by either rewinding the existing motors or replacing the motors. In the event rewinding or replacement is required, every effort will be made to accomplish this during the upcoming Cycle X refueling outage; however, if this is not possible, at least 60 days prior to the end of that outage SCE will provide for NRC approval the schedule for rewinding or replacement and further justification for plant operation beyond that outage.
8.807280143 880722 PDR ADOCK 05000206 P
PDC
Document Control Desk July 22, 1988 Pending long term resolution of this issue, continued operation with the existing charging pump motors is acceptable based on the evaluation performed by Westinghouse which was submitted to the NRC in our July 21 letter. The conclusion of this evaluation is that these motors will perform satisfactorily under accident conditions. This evaluation is based on the operators controlling the post-accident recirculation flow to levels consistent with the overload conditions used in the evaluation. Each emergency operating instruction which includes use of the charging pumps to provide flow through the cold leg injection paths includes a specific caution that the operator is not to exceed the limiting flow levels in order to avoid potential damage to the charging pumps. The cold leg injection path is placed in service by the operator remote manually opening MOV's 356, 357 and 358 and then remote manually throttling the FCV's 1115D, 1115E and 1115F to the required flow rates.
Flow indication is located immediately adjacent to the valve controllers. Therefore, since this operation is under the direct manual control of the operator and there is a specific caution to limit the flow, there is adequate assurance that the charging pumps will be operated within the limits of the Westinghouse evaluation.
If you have any questions, please contact me.
Very truly yours, cc:
- 3. B. Martin, Regional Administrator, NRC Region V F. R. Huey, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3
