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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20084E328 | 21 January 1974 | Telecopy of AO 50-244/74-01:on 740118,during Removal of Insert Steam Generator a Hot Leg,Inrush of Air to Generator Occurred Causing Imbalance of Water Still in Tubes.Boration Started Immediately | |
| ML20084E388 | 21 June 1973 | AO 73-3 & 73-4:on 730611 & 12,during Performance of Periodic Test & Following Satisfactory Test of Safety Injection Pumps I-A & B,Safety Injection Pump I-C Failed to Start to Bus 16. Caused by Slightly Bent Operator Arm on Cell Switch | |
| ML20084E409 | 13 June 1973 | AO 73-4:on 730612,safety Injection Pump 1C Failed to Start Manually from Bus 16 When Control Switch Closed at Control Board.Caused by Problem W/Cell Switch in Bus 16 Breaker. Switch Adjusted & Pump Started Satisfactorily | |
| ML20084E423 | 11 June 1973 | AO 73-3:on 730611,safety Injection Pump 1C Failed to Start Manually from Bus 16 When Control Switch Closed at Control Board.Cause Unknown.Overcurrent Trip Devices Tested Following Maint Procedure M-32 & Functioned Satisfactorily | |
| ML20084E447 | 26 August 1970 | Ao:On 700818,overpower Rod Stop & Reactor Trip Bistable TC 407A/B Found Faulty.Caused by Malfunctioning Zener Diode in Regulated Power Supply.Bistable Replaced | |
| ML20084E460 | 3 January 1970 | Telecopy Message of Ao:On 700103,B Train Safety Injection Sequence Failed to Operate Following Signal.Caused by Dirty Contacts on Relay.Contacts Cleaned | |
| ML20084E492 | 19 August 1970 | Telecopy Message of Ao:On 700818,overpower Rod Stop & Reactor Trip Bistable TC-407/B Found Faulty.Bistable Replaced | |
| ML20084E666 | 23 April 1971 | Telecopy Message of Ao:On 710422,during Diesel Generator Load & Safeguard Sequence Test,Valves 826 A,B,C & D Failed to Open.Electrical Speed for Concentrated Boric Acid Storage Tank Level Instrumentation Moved to Bus Supplies | Boric Acid |
| ML20084E709 | 6 July 1970 | Telecopy Ao:On 700706,boron Dilution Performed W/Reactor Critical & No Reactor Coolant Pump or RHR Pump in Operation | |
| ML20084E746 | 18 May 1970 | Telecopy Ao:On 700514,MSIV 1B Failed to Close Following Load Rejection Test.Packing Gland Adjusted | |
| ML20084E801 | 6 March 1970 | Telecopy Ao:On 700306,during Surveillance Test,Excessive Air Leakage Along Shaft That Penetrates to Outside & Inside Hand Control Wheels Noted.Repairs Initiated Immediately | |
| ML20084E851 | 5 October 1970 | Telecopy Ao:On 701004,gape Valve 852B Only Opened Halfway. Caused by Loose Stem Nut of Limitorque Operator.Nut Replaced | |
| ML20084E863 | 14 October 1970 | Telecopy Message of Ao:On 701014,gate Valve 851A Failed to Fully Close.Caused by Loose Stem Nut Locking.Lock Tightened & Stem Lubricated | |
| ML20084F049 | 7 February 1972 | Ao:On 720203,power Range High Setpoint on Nuclear Power Channel N-41 Found Exceeding Tech Spec Limits.Caused by Shift of Low Voltage Supply.Channel Realigned within Proper Limits | |
| ML20084F061 | 3 February 1972 | Telecopy Ao:On 720203,while Conducting Biweekly Surveillance,Power Range High Flux Set Points Found to Be 110%.Caused by Negative Power Supply Voltage Drifting Out of Spec.Setpoints Realigned | |
| ML20084F111 | 27 January 1972 | Ao:On 720118,during Routine Monthly Surveillance Test, Pressurizer Pressure Bistable Failed to Deenergize on Low Pressure Set Point.Caused by Fluctuating Output of Bistable When Placed on Trip Point.Bistable Replaced | |
| ML20084F413 | 21 December 1973 | AO 50-244/73-11:on 731214,motor Driven Feedwater Pumps a & B Found Air Bound & Would Not Pump.Caused by Presence of Air in Suction Side of Motor Driven Auxiliary Feedwater Pumps. Installation of Vent on Condensate Reject Line Initiated | |
| ML20084F463 | 15 December 1973 | Telecopy of AO 50-244/73-11:on 731214,during Auxiliary Feedwater Sys Flow Test,Motor Driven Pump a Started & No Pressure or Flow Indication Found.Installation of Vent on High Point of Condensate Reject Line Advised | |
| ML20084F565 | 31 October 1973 | AO 50-244/73-10:on 731021,safety Injection Pump Suction Transferred Prematurely from Boric Acid Storage Tanks to Refueling Water Storage Tank.Caused by Loss of Power to Instrument Bus 1A.Bus Panel Doors Locked to Reduce Error | Boric Acid Earthquake |
| ML20084F602 | 31 October 1973 | AO 50-244/73-09:on 731021,instability of Transmission Sys & Loss of Outside Power Occurred Resulting in Reactor Trip. Caused by Procedures Permitting Generation of 435 Mwe When One Transmission Line Was Out.New Procedures Initiated | Boric Acid |
| ML20084F634 | 23 October 1973 | AO 50-244/73-09:on 731021,loss of Outside Power Occurred Resulting in Reactor Trip.Ao 50-244/73-10:on 731021, Malfunction of Safety Injection Pump Suction Transfer from Boric Acid Storage Tanks to Refueling Water Tank Occurred | Boric Acid |
| ML20084F646 | 14 September 1973 | AO 50-244/73-08:on 730907,flow Channel on Steam Generator 1A Failed Downscale While at Steady State Operation.Caused by Flexure Wire Connecting Dp Cell to Strain Gauge Failing at Soldered Joint | |
| ML20084F666 | 10 September 1973 | Telecopy AO 50-244/78-08:on 730907,steam Flow Indicator FI-463 on Steam Generator 1A Failed Downscale.Caused by Failed Solder Connection on Flexure Wire Connection,Between Strain Gauge & Dp Cell Shaft Extension.Wire Soldered | |
| ML20084G060 | 1 August 1973 | AOs 50-244/73-06 & 50-244/73-07:on 730722,sensing Line on Auxiliary Feedwater Pump B Failed,Causing Reactor Trip. Caused by Disconnected Line on Discharge Valve.Sensing Line for Pump B Reworked | |
| ML20084G064 | 27 July 1973 | Telecopy of AOs 50-244/73-06 & 50-244/73-07:on 730722, Sensing Line on Auxiliary Feedwater Pump B Failed.Caused by Disconnected Swagelock Fitting Associated W/Auxiliary Feedwater Flow Orifice | |
| ML20084G102 | 27 July 1973 | Ao:On 730717,during Periodic Test PT5,one Side of Bistable LC-427 A/C Failed to de-energize on Inserted Signal Equal to 5% Pressurizer Water Level.Caused by Cold Solder Joint Failure.Module Replaced | |
| ML20084G107 | 18 July 1973 | Telecopy of Ao:On 730717,during Surveillance Test,Components of One Side of Bistable LC-427 A/C Failed to de-energize When Signal Equal to 5% of Pressurizer Level Inserted. Cause Not Stated | |
| ML20084H030 | 16 April 1974 | AO 50-244/74-04:on 740406,during Surveillance Test PT 2.1, Safety Injection Pump 1C Failed to Start Manually When Connected to Bus 16.Caused by Trip Bar Switch Prematurely Closing.Lockout Coil Assembly & Trip Bar Switch Adjusted | |
| ML20084H034 | 8 April 1974 | AO 50-244/74-04:on 740406,during Periodic Test PT-2,1,safety Injection Pump 1C Failed to Start Manually on Bus 16.Caused by Failure of Capacitor in Control Circuit & Malfunction of Tripper Bar Switch.Switch Adjusted |