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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20087L571 | 2 February 1976 | AO 76-3:during Refueling Outage from 751116-760108,nine Valves Exhibited Leak Rate in Excess of 2000 Cc/Minute. Caused by Loose Body to Bonnet Joint.Bolting Tightened | |
| ML20087K938 | 8 March 1975 | AO 50-266/75-4:on 750226,air Ejector Discharge Gas Monitor R15 Pegged High,Then Dropped Low.Operator Manually Secured RCS Letdown & Went to Auxiliary Bldg to Assist in Locating Suspected Leak | |
| ML20087L091 | 18 February 1975 | AO 75-3:on 750208,mechanical Latching Mechanism on Redundant Solenoid Trip Vent Valve 2018C on Main Steam Stop Valve a Failed to Unlatch When Solenoid Deenergized.Caused by Improper Rotation of Rollers as Designed | |
| ML20087L209 | 28 January 1975 | AO 75-1:on 750120,first of 4 Tanks of Sludge Lancing Waste Sampled & Iodine Levels Found Approx 9 Times Max Permissable Concentration.Caused by Fuel Cladding Leaks Plus Small primary-to-secondary Leak in Steam Generator a | Fuel cladding |
| ML20087L266 | 22 November 1974 | Ao:On 741009,while Personnel Exiting Containment Via 66 Ft Level Personnel Airlock,Air Heard Escaping Following Closing of Inner Door.Caused by Open 3/8-inch Valve on Pressure Gauge Instrument Line.Valve Removed.Served No Purpose | |
| ML20087L310 | 30 August 1974 | Ao:On 740821,recheck of Control Panel Indicated Above Normal Operating Pressure & Water Level Conditions Existed in Blowdown Evaporator.Caused by Steam Leaking at Steam Supply Control Valve | |
| ML20087L319 | 27 August 1974 | Ao:On 740815,during Monthly Surveillance Test,Steam Generator B Level Channel 472,lo-lo Level Bistable Would Not Trip When Tested.Caused by Failed Silicon Controlled Rectifier.Rectifier Replaced | |
| ML20087L325 | 22 July 1974 | Ao:On 740711,rereview of Tech Spec Changes Allowed part-length Rods to Be Inserted Not More than 70%.On 740529,part-length Rods Inserted to Max Integral Worth, 82.5% & Remained in That Position Until 740608 | |
| ML20087L344 | 13 June 1974 | Ao:On 740325,valve Permitting 150 Gallons of Reactor Coolant to Enter Waste Holdup Tank Inadvertently Opened.Caused by Personnel Error.Operator Reprimanded & Reminded That Utmost Care Must Be Exercised on Valve Lineup Operations | |
| ML20087L336 | 8 June 1974 | Ao:On 740529,minor Leak Discovered in Main Steam Safety Valve & Secondary Side Steam Pressure Substantially Reduced to Reseat Safety Valve & Terminate Minor Leak. Caused by Incorrect Concentration of Borated Water | Boric Acid Shutdown Margin |
| ML20087L548 | 14 May 1974 | Ao:On 740509,auxiliary Bldg Stack Monitor R14 Alarmed at Setpoint During Refueling Activities of 4,000 Counts Per Minute Indicating Release of Radioactivity.Caused by Isolation of Vol Control Tank for Venting | |
| ML20087L593 | 3 May 1974 | Ao:On 740406,during Performance of Containment Isolation Valves Leak Tests,Two second-off Valves from Containment Found to Leak in Excess of 2000 Cc/Minute.Cause Not Stated. Leak Tests Ongoing.Valves Will Be Repaired & Retested | |
| ML20087L603 | 17 April 1974 | Ao:On 740407,while Running Motor Driven Auxiliary Feed Pump a to Maintain Steam Generator Water Levels,Operator Noted Pump Not Delivering at Adequate Feedwater Flow Rate.Caused by Strainer Fitted in Flanged Position | |
| ML20087L611 | 11 April 1974 | Ao:On 740404,following Completion of Operations Refueling Tests,Isolation Valves 1AOV-2084 & 1AOV-2083 Closed Automatically on Signal from R-19 Process Monitor,Indicating Liquid W/Radioactivity Above Normal Levels | |
| ML20087L620 | 4 April 1974 | Ao:On 730329,when Drain Cap Removed from Penetration 32,air Blew Lightly for Several Seconds & Showed No Signs of Diminishing.Caused by Leak of Sensing Line within Penetration Boundary.Line Will Be Repaired | |
| ML20087L626 | 6 February 1974 | Ao:On 740125,auxiliary Bldg Stack Monitor R-14 Alarmed Indicating Release of Radioactivity.Caused by Increased Pressure Attained in Holdup Tanks & Suction of Waste Gas Compressors | |
| ML20087L697 | 3 November 1973 | Ao:On 731013,boric Acid Storage Tank B Placed in Svc & Boric Acid Tank a Concentration Known to Have Fallen Below Tech Spec Limit Immediately Prior to Transfer of Tanks. Caused by Two Personnel Errors | Boric Acid |
| ML20084A090 | 29 October 1973 | Ao:On 730915,following Investigation of Excess Letdown Line Leak,Valve 1MOV-1299 Downstream Seat Protruded from Valve Body & Crack Discovered in Upper Portion of Downstream Seat Ring.Cause Unknown.Vendor Notified of Valve Problem | |
| ML20087L629 | 16 July 1973 | Ao:On 730708,high Level Alarm on Facade Sump Received in Main Control Room.Caused by Small But Steady Flow Into Sump from Unknown Source.Retransfer of Borated Water from Refueling Water Storage Tank Instigated | |
| ML20087L631 | 28 May 1973 | Ao:On 730512,to Expedite Shutdown & Draining of Radwaste Sys Waste Evaporator,Operating Personnel Manually Lifted One of Two Evaporator Safety Valves.Following Shutdown,Valve Remained in Raised Condition.Procedure Pbnp 4.17 Expanded | |
| ML19317D466 | 11 August 1971 | Ao:On 710803,release of Radioactive Liquid Into Sewage Retention Pond Resulted from Overflow of Unit 2 Facade Sump During Filling Operation.Caused by Problems W/Facade Drain | Boric Acid |