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Category:MONTHLY OPERATING ANALYSIS REPORT
MONTHYEARML20217D6851999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for North Anna Power Station,Units 1 & 2.With ML20216E5011999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for Naps,Units 1 & 2. with ML20210S1411999-07-31031 July 1999 Monthly Operating Repts for July 1999 for North Anna Power Station.With ML20209E5641999-06-30030 June 1999 Monthly Operating Repts for June 1999 for North Anna Power Stations,Units 1 & 2.With ML20195G1901999-05-31031 May 1999 Monthly Operating Rept for May 1999 for NAPS Units 1 & 2. with ML20206Q6671999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for North Anna Power Station,Units 1 & 2.With ML20205K3041999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for North Anna Power Station,Units 1 & 2.With ML20207K5921999-02-28028 February 1999 Monthly Operating Repts for Feb 1999 for North Anna Power Station,Units 1 & 2.With ML20199C8781998-12-31031 December 1998 Monthly Operating Repts for Dec 1998 for North Anna Power Station,Units 1 & 2.With ML20197G8551998-11-30030 November 1998 Monthly Operating Repts for Nov 1998 for North Anna Power Station,Units 1 & 2.With ML20195D0571998-10-31031 October 1998 Monthly Operating Repts for Oct 1998 for North Anna Power Station,Units 1 & 2.With ML20154H4001998-09-30030 September 1998 Monthly Operating Repts for Sept 1998 for North Anna Power Station,Units 1 & 2.With ML20151W4711998-08-31031 August 1998 Monthly Operating Repts for Aug 1998 for North Anna Power Station Units 1 & 2.With ML20237A4341998-07-31031 July 1998 Monthly Operating Repts for July 1998 for North Anna Power Station,Units 1 & 2 ML20236M3381998-06-30030 June 1998 Monthly Operating Repts for June 1998 for North Anna Power Station,Units 1 & 2 ML20248M1011998-05-31031 May 1998 Monthly Operating Repts for May 1998 for North Anna Power Station,Units 1 & 2 ML20247F4441998-04-30030 April 1998 Monthly Operating Repts for Apr 1998 for North Anna Power Station,Units 1 & 2 ML20216B1891998-03-31031 March 1998 Monthly Operating Repts for Mar 1998 for North Anna Power Station,Units 1 & 2 ML20216E2561998-02-28028 February 1998 Monthly Operating Repts for Feb 1998 for North Anna Power Station,Units 1 & 2 ML20202D5811998-01-31031 January 1998 Monthly Operating Repts for Jan 1998 for North Anna Power Station,Units 1 & 2 ML20198P1351997-12-31031 December 1997 Monthly Operating Repts for Dec 1997 for North Anna Power Station,Units 1 & 2 ML20203F3531997-11-30030 November 1997 Monthly Operating Repts for Nov 1997 for North Anna Power Station,Units 1 & 2 ML20199C6871997-10-31031 October 1997 Monthly Operating Repts for Oct 1997 for North Anna Power Station,Units 1 & 2 ML20217H9201997-09-30030 September 1997 Monthly Operating Repts for Sept 1997 for North Anna Power Station,Units 1 & 2 ML20216H9141997-08-31031 August 1997 Monthly Operating Repts for Aug 1997 for North Anna Power Station,Units 1 & 2 ML20210K5501997-07-31031 July 1997 Monthly Operating Repts for Jul 1997 for North Anna Power Station,Units 1 & 2 ML20210K5581997-06-30030 June 1997 Revised Monthly Operating Rept for June 1997 for North Anna Power Station,Units 1,correcting Error Found on Shutdowns & Power Reductions Summary ML20140E5371997-05-31031 May 1997 Monthly Operating Repts for May 1997 for North Anna Power Station Units 1 & 2 ML20148B3771997-04-30030 April 1997 Monthly Operating Repts for Apr 1997 for North Anna Power Station Units 1 & 2 ML20141E2681997-04-30030 April 1997 Monthly Operating Repts for Apr 1997 for North Anna Power Station Units 1 & 2 ML20140D7551997-03-31031 March 1997 Monthly Operating Repts for North Anna Power Station,Units 1 & 2 ML20135F3111997-02-28028 February 1997 Monthly Operating Repts for Feb 1997 for North Anna Power Station,Units 1 & 2 ML20134H2961997-01-31031 January 1997 Monthly Operating Repts for Jan 1997 for North Anna Power Station Units 1 & 2 ML20133G5291996-12-31031 December 1996 Monthly Operating Repts for Dec 1996 for North Anna Power Station Units 1 & 2 ML20135E4961996-11-30030 November 1996 Monthly Operating Repts for Nov 1996 for North Anna Power Station Units 1 & 2 ML20134K5811996-10-31031 October 1996 Monthly Operating Repts for Oct 1996 for North Anna Power Station Unit 1 & 2 ML20128N1301996-09-30030 September 1996 Monthly Operating Repts for Sept 1996 for North Anna Power Station Unit 1 & 2 ML20117M0781996-08-31031 August 1996 Monthly Operating Repts for Aug 1996 for North Anna Power Station Units 1 & 2 ML20116J6431996-07-31031 July 1996 Monthly Operating Repts for Jul 1996 for North Anna Power Station Units 1 & 2 ML20115G2341996-06-30030 June 1996 Monthly Operating Repts for June 1996 for North Anna Power Station Units 1 & 2 ML20117M1811996-05-31031 May 1996 Monthly Operating Rept for May 1996 for North Anna 1 ML20117E7501996-04-30030 April 1996 Monthly Operating Rept for Apr 1996 for North Anna Power Station Units 1 & 2 ML20107C2951996-03-31031 March 1996 Monthly Operating Repts for Mar 1996 for North Anna Power Station Units 1 & 2 ML20106H0631996-02-29029 February 1996 Monthly Operating Repts for Feb 1996 for NAPS ML20097D5661996-01-31031 January 1996 Monthly Operating Repts for Jan 1996 for North Anna Power Station Units 1 & 2 ML20096C3041995-12-31031 December 1995 Monthly Operating Repts for Dec 1995 for North Anna Power Station,Units 1 & 2 ML20095D8611995-11-30030 November 1995 Monthly Operating Repts for Nov 1995 for North Anna Power Station ML20094H3601995-10-31031 October 1995 Monthly Operating Repts for Oct 1995 for North Anna Power Station ML20093D8781995-09-30030 September 1995 Monthly Operating Repts for Sept 1995 for North Anna Power Station Units 1 & 2 ML20092F5571995-08-31031 August 1995 Monthly Operating Repts for Aug 1995 for North Anna Power Station 1999-09-30
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20217N9281999-10-20020 October 1999 Special Rept:On 991003,PZR PORV Actuation Mitigated RCS low- Temp Overpressure Transient.Caused by a RCP Facilitating Sweeping of Entrained Air Out of RCS Loops.Operating Procedure 2-OP-5.1 Will Be Revised ML20217H3631999-10-14014 October 1999 Rev 0 to COLR for North Anna 2 Cycle 14 Pattern Su ML18152A2811999-10-12012 October 1999 Technical Basis for Elimination of Nozzle Inner Radius Insps (for Nozzles Other than Reactor Vessel),Technical Basis for ASME Section XI Code Case N-619. ML20212J9251999-10-0101 October 1999 Safety Evaluation Accepting Licensee Relief Request IWE-3 for Second 10-year ISI for Plant ML20217D6851999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for North Anna Power Station,Units 1 & 2.With ML20211N2611999-09-0808 September 1999 Safety Evaluation Concluding That Proposed Irradiation of Fuel Rods Beyond Current Lead Rod Burnup Limit & Clarification of Terminology with Respect to Reconstituted Fuel Assemblies Acceptable ML20211J2561999-08-31031 August 1999 Safety Evaluation Accepting Elimination of Augmented ISI Program for Pressurizer Spray Lines at North Anna Unit 2 ML20216E5011999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for Naps,Units 1 & 2. with ML20211J2421999-08-31031 August 1999 Safety Evaluation Supporting Removal of Augmented Insp Program on RCS Bypass Lines from Licensing Basis of North Anna,Units 1 & 2 ML20210T0791999-08-13013 August 1999 Safety Evaluation Concluding That Revised Withdrawal Schedules for North Anna Units 1 & 2 Satisfy Requirements of App H to 10CFR50 & Therefore Acceptable ML20210S1411999-07-31031 July 1999 Monthly Operating Repts for July 1999 for North Anna Power Station.With ML20210Q9931999-07-31031 July 1999 Rev 1 to COLR for North Anna Power Station,Unit 2 Cycle 13 Pattern Ud ML20209E5641999-06-30030 June 1999 Monthly Operating Repts for June 1999 for North Anna Power Stations,Units 1 & 2.With ML20195G1901999-05-31031 May 1999 Monthly Operating Rept for May 1999 for NAPS Units 1 & 2. with ML20206L4831999-05-10010 May 1999 SER Accepting Request to Delay Submitting Plant,Unit 1 Class 1 Piping ISI Program for Third Insp Interval Until 010430, to Permit Development of Risk Informed ISI Program for Class 1 Piping ML20206Q6671999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for North Anna Power Station,Units 1 & 2.With ML20205S0391999-04-21021 April 1999 SER Accepting Request for Relief IWE5,per 10CFR50.55a(a)(3) & Proposed Alternatives for IWE2,IWE4,IWE6 & IWL2 Authorized Per 10CFR50.55a(a)(3)(ii) ML20205K3041999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for North Anna Power Station,Units 1 & 2.With ML20207K5921999-02-28028 February 1999 Monthly Operating Repts for Feb 1999 for North Anna Power Station,Units 1 & 2.With ML20207E1731999-02-18018 February 1999 Informs Commission of Status of Preparations of IAEA Osart Mission to North Anna Nuclear Power Plant Early Next Year ML20205A0241998-12-31031 December 1998 Summary of Facility Changes,Tests & Experiments,Including Summary of SEs Implemented at Plant During 1998,per 10CFR50.59(b)(2).With ML20199C8781998-12-31031 December 1998 Monthly Operating Repts for Dec 1998 for North Anna Power Station,Units 1 & 2.With ML20198H9541998-12-0303 December 1998 Safety Evaluation Authorizing Proposed Alternative for Remainder of Second 10-yr Insp Interval for Plant ML20198J5561998-12-0303 December 1998 ISI Summary Rept for North Anna Power Station,Unit 1 1998 Refueling Outage Owner Rept for Inservice Insps ML20197G8551998-11-30030 November 1998 Monthly Operating Repts for Nov 1998 for North Anna Power Station,Units 1 & 2.With ML20196G1381998-11-0303 November 1998 Safety Evaluation Authorizing Rev to Relief Request NDE-32 for Remainder of Second 10-yr Insp Interval for Each Unit ML20195D0571998-10-31031 October 1998 Monthly Operating Repts for Oct 1998 for North Anna Power Station,Units 1 & 2.With ML20154L0691998-10-14014 October 1998 COLR for North Anna Power Station Unit 1 Cycle 14 Pattern Xy ML20155J6911998-10-0909 October 1998 Staff Response to Tasking Memorandum & Stakeholder Concerns ML20154H4001998-09-30030 September 1998 Monthly Operating Repts for Sept 1998 for North Anna Power Station,Units 1 & 2.With ML20151X8011998-09-10010 September 1998 Special Rept:On 980622,groundwater Level at Piezometer P-22 Was Again Noted to Be Above Max Water Level by 0.71 Feet. Increased Frequency of Piezometer Monitoring & Installed Addl Piezometers at Toe of Slope Along Southwest Section ML20151W4711998-08-31031 August 1998 Monthly Operating Repts for Aug 1998 for North Anna Power Station Units 1 & 2.With ML20237A4341998-07-31031 July 1998 Monthly Operating Repts for July 1998 for North Anna Power Station,Units 1 & 2 ML20236V1251998-07-14014 July 1998 ISI Summary Rept for Naps,Unit 2,1998 Refueling Outage Owners Rept of Isis ML20236K5531998-07-0707 July 1998 SER Accepting Request for Change in ISI Commitment on Protection Against Pipe Breaks Outside Containment ML20236M3381998-06-30030 June 1998 Monthly Operating Repts for June 1998 for North Anna Power Station,Units 1 & 2 ML20248M1011998-05-31031 May 1998 Monthly Operating Repts for May 1998 for North Anna Power Station,Units 1 & 2 ML20248C8831998-05-29029 May 1998 SER Accepting Alternatives Proposed by Licensee for Use of Code Case N-535,pursuant to 10CFRa(a)(3)(i) in ASME Section XI Inservice Insp Program ML20247K9281998-05-15015 May 1998 Special Rept:On 980428,letdown PCV Exhibited Slow Response When C RCP Was Started.Cause to Be Determined.Review of Operating Procedure Will Be Performed to Determine If Enhancements Are Necessary ML20216A8971998-05-0606 May 1998 Rev 0 to Cycle 13 Pattern Ud COLR for North Anna Unit 2 ML20247F4441998-04-30030 April 1998 Monthly Operating Repts for Apr 1998 for North Anna Power Station,Units 1 & 2 ML20217B5321998-04-20020 April 1998 Safety Evaluation Supporting Proposed Alternative to ASME Code for Surface Exam of Seal Welds on Threaded Caps for Plant Reactor Vessel Head Penetrations for part-length CRDMs ML20217H9611998-04-0707 April 1998 Special Rept:On 980216,groundwater Level at Piezometer P-22, Again Noted to Be Above Max Water Level by 0.41 Feet.Design Package for Installation of Addl Standpipe Piezometers at Toe of Slope Southeast Section,Developed ML20216B1891998-03-31031 March 1998 Monthly Operating Repts for Mar 1998 for North Anna Power Station,Units 1 & 2 ML20216E8801998-03-0606 March 1998 Safety Evaluation Authorizing Licensee Request for Relief from ASME Code Requirements,Paragraph IWA-2400(c) (Summer Edition W/Summer 1983 Addenda),For Upcoming Naps,Unit 1 Outage,Per 10CFR50.55a(a)(3)(ii) ML20216E2561998-02-28028 February 1998 Monthly Operating Repts for Feb 1998 for North Anna Power Station,Units 1 & 2 ML20199J6431998-02-0202 February 1998 Safety Evaluation Approving Request for Approval to Repair Flaws in Accordance W/Gl 90-05 for ASME Code Class 3 SW Piping for North Anna,Unit 1,as Submitted in ISI Relief Request NDE-46 on 971218 ML20202D5811998-01-31031 January 1998 Monthly Operating Repts for Jan 1998 for North Anna Power Station,Units 1 & 2 ML20198S7571998-01-15015 January 1998 Safety Evaluation Accepting Licensee Request for Approval to Repair Flaws IAW GL-90-05 for ASME Code Class 3 Svc Water Piping ML20198P1351997-12-31031 December 1997 Monthly Operating Repts for Dec 1997 for North Anna Power Station,Units 1 & 2 1999-09-08
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VIRGINIA ELECTRIC AND POWER COMPANY i
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NORTH ANNA POWER STATION MONTHLY OPERATING REPORT i MONTH February YEAR 1983 APPROVED:
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STATION MANA
, 8304150391 830315 PDR ADDCK 05000338 R PDR
AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-338 UNIT NA-1 DATE 03-01-83 COMPLETED BY G. Schmitendorf TELEPHONE 703-894-5151X2502 MONTH February DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net) (MWe-Net) 1 0 17 0 2 0 18 0 3 0 19 0 4 0 20 0 5 0 21 0 6 0 22 0 7 0 23 0 8 0 24 0 9 0 25 0 10 0 26 0 11 0 27 0 12 0 28 0 13 0 29 14 0 30 15 0 31 16 0 INSTRUCTIONS On this format, list the average daily unit power level in MWe-Net for each day in the reporting month. Compute to the nearest whole megawatt.
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OPERATING DATA REPORT DOCKET NO. 50-338
, DATE 03-01-83 ELE ONE ( b3 84 5 . 02:
OPERATING STATUS Notes
- 1. Unit Name: North Anna 1
- 2. Reporting Period: February 1983
- 3. Licensed Thermal Power (MWt): 2775
- 4. Nameplate Rating (Gross MWe): 947
- 5. Design Electrical Rating (Net NWe): 907
- 6. Maximum Dependable Capacity (Gross MWe): 918
- 7. Maximum Dependable Capacity (Net MWe): 865
- 8. If Changes occur in Capacity Ratings (Items No. 3 thru 7) Since Last Report, Give Reasons-N/A
- 9. Power Level To Which Restricted, If Any (Net MWe): N/A
- 10. Reasons For Restrictions, If Any: N/A This Month Yr.-to-Date Cumulative
- 11. Hours In Reporting Period 672 _
1,416 ,
41,497
- 12. Number of Hours Reactor Was Critical 0 0 27,123
- 13. Reactor Reserve Shutdown Hours 0 0 1,998.1
- 14. Hours Generator On-Line 0 ___ 0 26,382.2
- 15. Unit Reserve Shutdown Hours 0 0 0
- 16. Gross Thermal Energy Generated (MWH) 0 0 68,259,35a
- 17. Gross Electrical Energy Generated (MWH) 0 0 21,784,532
- 18. Net Electrical Energy Generat,ed (MWH) 0 0 20,520,733
- 19. Unit Service Factor 0 0 63.6
! 20. Unit Availability Factor 0 0 63.6
, 21. Unit Capacity Factor (Using MDC Net) 0 0 57.2
- 22. Unit Capacity Factor (Using DER Net) 0 0 54.5
- 23. Unit Forced Outage Rate 100.0 100.0 100.0
- 24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each):
i 1
- 25. If Shut Down At End Of Report Period, Estimated Date of Startup: 03-07-83
- 26. Units In Test Status (Prior to Commercial Operation):
Forecast Achieved INITIAL CRITICALITY INITIAL ELECTRICITY COMMERCIAL OPERATION 4
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i UNIT SHUTDOWNS AND POWER REDUCTIONS DOCKET NO. 50-338 UNIT NAME North Anna 1 DATE 03-01-83 REPORT MONTH February COMPLETED BY G. D. Schmitendorf TELEPHONE (703) 894-5151 X25Q2 Type Duration Reason2 l
No. Date Method of Licensee System Component cause & Corrective (Hours) Shutting 3
vent de 4
Code 5
Action to .
Down Reactor Report # Prevent Recurrence 82-12 821205 F 672 A 3 82-85 SF INSTRU Replacement main generator has been installed. The main trans-formers are being replaced. ,
a 1 2 3 4 F: Forced Reason: Method: Exhibit F - Instructions S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data B-Maintenance or Test 2-Manual Scram. Entry Sheets for Licensee C-Refueling 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuations (NUREG-0161)
E-Operator Training & License Examination 5-Load Reduction F-Administrative 9-Other G-Operational Error (Explain)
H-Other (Explain) Exhibit H - Same Source
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P Page 1 of 1 UNIT SHUTDOWN AND POWER REDUCTIONS EXPLANATION SHEET DOCKET NO. 50-338 REPORT MONTH February UNIT NAME NA-1 YEAR 1983 DATE 03-01-83 COMPLETED BY G. D. Schmitendorf 2
NO ENTRIES THIS MONTH i
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AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-339 UNIT NA-2 DATE 03-01-83 COMPLETED BY G. Schmitendor TELEPHONE 703-894-5151X2502 MONTH February t
DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER IIVEL (MWe-Net) (MWe-Net) 1 867 17 866 2 868 18 869 3 868 19 864 4 868 20 868 5 865 21 864 6 855 22 864
! 7 865 23 866 8 867 24 868 9 866 25 863 10 866 26 863 11 867 27 533 12 864 28 0 13 857 29 14 865 30 15 862 31 16 859 INSTRUCTIONS On this format, list the average daily unit power level in MWe-Net for each day in the reporting month. Compute to the nearest whole megawatt.
OPERATING DATA REPORT
, DOCKET NO. 50-339 DATE 03-01-83 COMPLETED BY G. D. Schmitendorf TELEPHONE (703) 894-5151 X2502 OPERATING STATUS Notes
- 1. Unit Name: North Anna 2
- 2. Reporting Period: February 1983
- 3. Licensed Thermal Power (MWt): 2775
- 4. Nameplate Rating (Gross MWe): 947
- 5. Design Electrical Rating (Net MWe): 907
- 6. Maximum Dependable Capacity (Gross MWe): 939
- 7. Maximum Dependable Capacity (Net MWe): 890
- 8. If Changes Occur in Capacity Ratings (Items No. 3 thru 7) Since Last Report, Give Reasons N/A
- 9. Power Level To Which Restricted, If Any (Net MWe): N/A
- 10. Reasons For Restrictions, If Any: N/A This Month Yr.-to-Date Cumulative
- 11. Hours In Reporting Period 672 1,416 19,368
- 12. Number of Hours Reactor Was Critical 638. 8 1,332.1 13,835.2
- 13. Reactor Reserve Shutdown Hours 33.2 129.1 2,150.9
- 14. Hours Generator On-Line 638.8 1,286.9 13,739.6
- 15. Unit Reserve Shutdown Hours 0 0 0
- 16. Gross Thermal Energy Generated (MWH) 1,773,633 3,321,345 35,047,365
- 17. Gross Electrical Energy Generated (MWH) 581,595 1,089,616 11,678,912
- 18. Net Electrical Energy Generated (MWH) 552,561 1,031,959 11,081,577
- 19. Unit Service Factor 95.1 90.9 ~~
70.9
- 20. Unit Availability Factor 95.1 90.9 70.9
- 21. Unit Capacity Factor (Using MDC Net) 92.4 81.9 64.3
- 22. Unit Capacity Factor (Using DER Net) 90.7 80.4 63.1
- 23. Unit Forced Outage Rate 4.9 9.1 19.1
- 24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each):
Refueling Outage 04-01-83 thru 05-13-83
- 25. If Shut Down At End Of Report Period, Estimated Date of Startup: 03-01-83
- 26. Units In Test Status (Prior to Commercial Operation):
Forecast Achieved INITIAL CRITICALITY INITIAL ELECTRICITY COMMERCIAL OPERATION
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- UNIT SHUTDOWNS AND POWER REDUCTIONS DOCKET NO. 50-339
.i UNIT NAME North Anna 2 DATE 03-01-83 REPORT MONTH February COMPLETED BY G. D. Schmitendorf
- j TELEPHONE (703) 894-5151 X2502 Type Duration Reason 2 l
No. Date Method of Licensee System Component Cause & Corrective (Hours) Shutting 3
Action to a Down Reactor Report # Prevent Recurrence 83-05 830227 F 33.2 A 3 NA NA NA Automatic Reactor Trip due to i
Steam Flow-Feed Flow Mismatch coincident with Low Level "B" S/G. Control Air Line to "B" ..
Main Feedwater Regulating Valve sheared causing the trip condit-ions to occur.
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1 2 3 4 F: Forced Reason: Method: Exhibit F - Instructions S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data 1 L-Maintenance or Test 2-Manual Scram. Entry Sheets for Licensee C-Refueling 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuations (NUREG-0161)
E-Operator Training & License Examination 5-Load Reduction F-Administrative 9-Other
, G-Operational Error (Explain)
H-Other (Explain) Exhibit H - Same Source ,
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Page 1 of 1 UNIT SHUTDOWN AND POWER REDUCTIONS l
EXPLANATION SHEET DOCKET NO. 50-339 REPORT MONTH February UNIT NAME NA-2 YEAR 1983 DATE 03-01-83 COMPLETED BY G. D. Schmitendorf I
l 83-05 (A) (3) At 1444 on February 27, 1983 with the unit at 100% an Automatic Reactor Trip occurred. The trip signal was Steam Flow-Feed Flow mismatch coincident with Low Steam Generator Level. The cause for the secondary coolant oscillation and subsequent reactor trip was due to the closing of "B" Main Feedwater Regulating Valve upon loss of air to the valve when the air supply line sheared. Subsequent to this event the air supply tubing to each feed regulating valve was replaced. The "B" Main Feedwater Regulating Valve air supply line sheared at the Gyrolock fitting.
It is suspected that fatigue failure of the tubing caused the shear. As of 2400 February 28, 1983 the unit was stable in Mode 3 (Hot Standby) with a reactor start-up ready to commence.
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