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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20086F426 | 16 June 1977 | Environ RO 77-14:on 770606 & 08,ph for Settling Basin Effluent Exceeded ETS Limit.Cause Not Identified.Settling Basin Isolated & Neutralized.Ph Checked & Sys Returned to Normal Operation | Grab sample |
| ML20086F470 | 27 January 1976 | Ro:On 760117,gaseous Activity Release Rate Exceeded 4% of Tech Spec 3.8.C.1 for More than 48 H.Caused by Increase in Offgas Activity Due to Fuel Cladding Perforations | Fuel cladding Power change |
| ML20086F473 | 23 December 1975 | Ro:On 751123,during Insp of Upper Portions of Drywell,Two of Eight Reactor Vessel Stabilizers Appeared to Have Been Slightly Deformed.Caused by Stabilizer Bindup & Cyclic Loading During Vessel Heatup or Cooldown | |
| ML20086F815 | 25 February 1977 | Environ RO 77-8:on 770217,total Suspended Solids for Sewage Plant Effluent Exceeded ETS Limit.Caused by Sys Upset Brought About by Reduced Bacterial Action within Activated Sludge Aeration Tank | |
| ML20086F818 | 18 February 1977 | Environ RO 77-6:on 770208,total Suspended Solids for Sewage Plant Effluent Exceeded ETS Limit.Caused by High Flow Carrying Solids Over from Aeration Tank.Chlorine Contact Tank Cleaned & Solids Removed | |
| ML20086F826 | 28 January 1977 | Environ RO 77-4:on 770118,total Suspended Solids for Sewage Plant Effluent Exceeded Environ Tech Spec Limit.Caused by High Flow Period Carrying Solids Over Aeration Tank Into Chlorine Contact Tank | |
| ML20086F828 | 27 January 1977 | Environ RO 77-3:on 770117,pH for Sewage Plant Effluent Exceeded ETS Limit.Caused by Influent W/Ph Slightly Lower than Normal.Sewage Plant Neutralized & Returned to Normal Operation | |
| ML20086F829 | 19 January 1977 | Environ 77-2:on 770109,total Suspended Solids for Settling Basin Effluent Exceeded ETS Limit.Caused by Excessive Flow Combined W/Solids from Clarifier.Settling Basin Isolated & Pumped Out to Reduce Solid Inventory | |
| ML20086F830 | 17 January 1977 | Environ RO 77-1:on 770107,total Suspended Solids for Sewage Plant Effluent Exceeded ETS Limit.Caused by High Flow Carrying Solids Over from Aeration Tank Into Chlorine Contact Tank & Info Effluent | |
| ML20086F833 | 26 October 1976 | Environ 76-41:on 761016,total Suspended Solids for Settling Basin Effluent Exceeded ETS Limit.Caused by Excessive Flow Combined W/Abnormal Solid Input from River Water.Settling Basin Isolated & Pumped Out | |
| ML20086F835 | 8 October 1976 | Environ RO 76-40:on 761001,pH for Settling Basin Effluent Exceeded ETS Limits.Caused by Neutralizing Tank B Overflowing Into Neutralizing Tank A.Settling Basin Isolated & Neutralized | Grab sample |
| ML20086G090 | 8 October 1976 | Environ RO 76-39:on 760929,pH for Settling Basin Effluent Exceeded ETS Limit.Caused by Soda Ash Solution Mix Tank Overflowing Into Raw Water Sump When Suction Line Plugged. Settling Basin Isolated & Neutralized | Grab sample |
| ML20086G098 | 1 October 1976 | Environ RO 76-38:on 760922,pH for Settling Basin Effluent Exceeded ETS Limit.Cause Not Determined.Settling Basin Isolated & Neutralized.Ph Checked & Normal Operation Resumed | Grab sample |
| ML20086G101 | 27 September 1976 | Environ RO 76-37:on 760917,total Suspended Solids for Sewage Plant Effluent Exceeded ETS Limit.Caused by High Flow Carrying Solids Over from Aeration Tank Into Chlorine Contact Tank & Effluent | |
| ML20086G104 | 24 September 1976 | Environ RO 76-36:on 760915,pH for Sewage Plant Effluent Exceeded ETS Limit.Caused by Cleaning Solution Containing 30% Hydrochloric Acid Flushed Into Sewage Plant.Sewage Plant Neutralized & Instructions Issued | Grab sample |
| ML20086G106 | 23 September 1976 | Environ RO 76-35:on 760913,pH for Settling Basin Effluent Exceeded ETS Limit.Caused by Valving Error During Regeneration of Cation Demineralizer.Valving Error Found & Corrected & Basin Isolated & Neutralized | Grab sample |
| ML20086G108 | 3 September 1976 | Environ RO 76-34:on 760827,total Suspended Solids for Sewage Plant Effluent Exceeded ETS Limit.Caused by High Flow That Carried Solids from Aeration Tank Into Chlorine Contact Tank & Effluent.Tank Cleaned | Temporary Modification |
| ML20086G110 | 23 August 1976 | Environ RO 76-33:on 760813,pH for Settling Basin Effluent Exceeded ETS Limit.Caused by Alum Feeder to Clarifier Overflowing to Raw Water Sump.Settling Basin Isolated & Raw Water Sump Pump Stopped | Grab sample |
| ML20086G114 | 23 August 1976 | Environ RO 76-32:on 760811,pH for Settling Basin Effluent Exceeded ETS Limit.Caused by Faulty Ph Meter on Neutralizing Tank Discharge to Settling Basin.Settling Basin Isolated & Neutralized | |
| ML20086G123 | 13 August 1976 | Environ RO 76-31:on 760804,pH for Settling Basin Effluent Exceeded Range Allowable by Ets.Caused by Faulty Ph Meter on Neutralizing Tank Discharge to Settling Basin.Settling Basin Isolated & Neutralized | Grab sample |
| ML20086G136 | 16 July 1976 | Environ RO 76-30:on 760707,pH for Settling Basin Effluent Exceeded Range Allowable by Ets.Cause Unknown.Memo Clearly Describing Proper Action During Clarifier Malfunction Sent to Operators & Supervisors | Grab sample |
| ML20086G143 | 18 June 1976 | Environ RO 76-29:on 760610,radioactivity in Critical Pathway Exceeded Tech Spec Limit.Caused by Presence of I-131.Surveillance of Roof Vent Iodine Release Rate Increased & Visual Insp & Air Sampling Program Initiated | |
| ML20086G158 | 17 June 1976 | Environ RO 76-28:on 760607,sewage Plant Effluent Suspended Solids Exceeded ETS Limit.Caused by Inoperability of Sludge Return Pump.Sludge Removed from Chlorine Contact Tank & Return Pump Returned to Svc | |
| ML20086G169 | 17 May 1976 | Environ RO 76-27:on 760507,three Cooling Towers Became Simultaneously Inoperable.Caused by Bolts Holding Impeller Housing to Pump Diffuser Section Failing.Investigation Continuing to Determine Corrective Action | |
| ML20086G194 | 14 May 1976 | Environ RO 76-26:on 760505,sewage Plant Effluent Suspended Solids Exceeded ETS Limit.Caused by Inoperability of Sludge Return Pump.Obstruction in Pump Removed & Sludge Removed from Settling Zone | |
| ML20086G213 | 14 May 1976 | Environ RO 76-25:on 760504,three Cooling Towers Became Simultaneously Inoperable.Caused by Tower Lift Pump C Inadvertently Tripping During Bus Switching.Lubricating Water Lines Flushed & Lift Pump C & Tower Returned to Svc | |
| ML20086G237 | 12 May 1976 | Environ RO 76-24:on 760502,two Cooling Towers Became Simultaneously Inoperable.Caused by Failure of Bolts Holding Suction Bell Housing to Pump Casing.Investigation Continuing to Determine Course of Action | |
| ML20086G241 | 7 May 1976 | Environ RO 76-23:on 760429,two Cooling Towers Became Simultaneously Inoperable.Caused by Shaft Line Bearing Housing Thrown Free & Falling Through Structure.Tower C Returned to Svc | Scaffolding |
| ML20086G243 | 7 May 1976 | Environ RO 76-22:on 760428,two Cooling Towers Became Simultaneously Inoperable.Caused by Accumulation of Silt in Lubricating Water Lines.Lines Flushed & Lift Pump C & Cooling Tower Returned to Svc | |
| ML20086G245 | 29 April 1976 | Environ RO 76-21:on 760419,two Cooling Towers Became Simultaneously Inoperable.Caused by Broken Gear Reducer Bracket Resulting in Fan Trip Due to High Vibration.Fans E&F Returned to Svc | |
| ML20086G248 | 19 November 1975 | AO 75-72:on 751109,crack in 3/4-inch Vent Line on RHR Piping Observed.Caused by Throttle of MO-2-10-1548 Valve Resulting in Crack.Repairs Completed in Accordance W/Approved Procedures | |
| ML20086G250 | 5 March 1976 | Environ RO 76-14:on 760224,three Cooling Towers Became Simultaneously Inoperative.Caused by Mechanical Failure. Valve Repaired & Tower Returned to Svc | |
| ML20086G253 | 5 March 1976 | Environ RO 76-13:on 760224,two Cooling Towers Simultaneously Inoperable.Caused by Mechanical Failure.Leaking Section of Distribution Header Repaired | |
| ML20086G256 | 12 April 1976 | Environ RO 76-19:on 760402,two Cooling Towers Became Simultaneously Inoperable.Caused by Worn Motor Bearings & Seized Line Bearing Box.Fan L Returned to Svc,Restoring Cooling Tower to Operable Status | |
| ML20086G258 | 24 March 1976 | Environ RO 76-17:on 760314,two Cooling Towers Become Simultaneously Inoperable.Caused by Plugging of Lubricating Water Lines.Lubricating Water Lines Flushed.Investigation Continuing | |
| ML20086G259 | 30 January 1976 | Environ RO 76-6:on 760120,sewage Plant Effluent Suspended Solids Exceeded ETS Limit.Caused by Solids Carried Over from Settling Zone Into Chlorine Contact Zone & Effluent.Sludge Return Line Blown Back W/Svc Air | |
| ML20086G262 | 23 January 1976 | Environ RO 76-5:on 760114,settling Basin Ph Exceeded ETS Limit.Caused by Neutralizing Tank Discharging Into Settling Basin W/O Being Neutralized Due to Improper Valving Lineup. Settling Basin Isolated & Neutralized | |
| ML20086G265 | 19 January 1976 | Environ RO 76-3:on 760109,Unit 2 Operated Above 20% Power W/All Cooling Towers Inoperable.Caused by Cooling Water Intake Temp Too Low to Facilitate Tower Startup W/O Causing Damage.No Corrective Action Required | |
| ML20086G267 | 15 January 1976 | Environ RO 76-1:on 760105,two Cooling Towers Became Simultaneously Inoperative.Caused by Worn Motor Bearings on Fans K & E.Failure of Fan L Under Investigation.Motor to Fan K Replaced & Repairs to Fan E in Progress | |
| ML20086G281 | 3 October 1975 | Environ RO 75-20:on 750923,second Fan on Cooling Tower C Lost.Caused by Failed Coupling.Fan F Motor Replaced & Balanced.Awaiting Parts for Repair of Fan D | |
| ML20086G308 | 28 February 1976 | Environ RO 76-11:on 760218,settling Basin Effluent Suspended Solids Concentration Exceeded Environ Tech Spec Limit.Caused by High Suspended Solids Level in River Water.Settling Basin Contents Settled & Solids Pumped Out | |
| ML20086G313 | 23 January 1976 | Environ RO 76-5:on 760114,settling Basin Effluent Ph Exceeded Environ Tech Spec Limit.Caused by Neutralizing Tank Discharged to Settling Basin W/O Being Neutralized Due to Improper Valving Lineup.Basin Isolated & Neutralized | |
| ML20086G315 | 22 January 1976 | Environ RO 76-4:on 760112,sewage Plant Effluent Suspended Solids Exceeded Environ Tech Spec Limit.Caused by Solids Carried Over from Settling Zone Into Chlorine Contact Tank. Chlorine Contact Tank Pumped Out | |
| ML20086G336 | 19 January 1976 | Environ RO 76-3:on 760109,Unit 2 Operated Above 20% Power W/All Cooling Towers Inoperable.Caused by Cooling Water Intake Temp Too Low to Facilitate Tower Startup W/O Causing Damage.No Corrective Action Required | |
| ML20086G344 | 15 January 1976 | Environ RO 76-2:on 760105,sewage Plant Effluent Suspended Solids in Excess of Environ Tech Spec Limit.Caused by Inadequate Sludge Return.Chlorine Contact Tank Pumped Out & Sludge Return Line Cleaned | |
| ML20086G353 | 26 November 1975 | Environ RO 75-26:on 751116,two Towers Simultaneously Inoperable.Caused by Failure of Lubricating Water Pump Motor Bearings.Lubricating Water Pump Motor Bearings Replaced | |
| ML20086G355 | 7 November 1975 | Environ RO 75-25:on 751030,sewage Plant Effluent Suspended Solids Exceeded Environ Tech Spec Limit.Caused by Plugged Sludge Return Pump.Sludge Pump Cleared & Returned to Svc | |
| ML20086G357 | 29 October 1975 | RO 75-24:on 751019,all Cooling Towers Removed from Svc. Caused by High Mud Content in River Water.After Mud Content in River Decreased,Cooling Tower a Returned to Svc. Corrective Maint Performed on Cooling Tower C | |
| ML20086G365 | 24 October 1975 | RO 75-23:on 751015,cooling Tower C Removed from Svc for Maint.Caused by Excessive Nitrogen Leakage from Fire Detection Sys.Accessable Connections on Nitrogen Piping Repaired | |
| ML20086G368 | 10 October 1975 | Environ RO 75-22:on 750930,second Fan on Cooling Tower C Failed.Caused by Gear Reducer Pinion Shaft Bearings Failure Resulting in Trip Due to High Vibration.Fan Repaired & Returned to Svc |