Overgreasing of Electric Motor BearingsML031150512 |
Person / Time |
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Site: |
Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant |
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Issue date: |
04/12/1988 |
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From: |
Rossi C E Office of Nuclear Reactor Regulation |
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To: |
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References |
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IN-88-012, NUDOCS 8804060370 |
Download: ML031150512 (9) |
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Similar Documents at Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant |
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Category:NRC Information Notice
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Mclaughlin on NRC, Regarding NRC Information Notice 2006-13: Groundwater Contamination 2020-09-03 The following query condition could not be considered due to this wiki's restrictions on query size or depth: <code> [[:Beaver Valley]] OR [[:Millstone]] OR [[:Hatch]] OR [[:Monticello]] OR [[:Calvert Cliffs]] OR [[:Dresden]] OR [[:Davis Besse]] OR [[:Peach Bottom]] OR [[:Browns Ferry]] OR [[:Salem]] OR [[:Oconee]] OR [[:Nine Mile Point]] OR [[:Palisades]] OR [[:Palo Verde]] OR [[:Perry]] OR [[:Indian Point]] OR [[:Fermi]] OR [[:Kewaunee]] OR [[:Catawba]] OR [[:Harris]] OR [[:Wolf Creek]] OR [[:Saint Lucie]] OR [[:Point Beach]] OR [[:Oyster Creek]] OR [[:Watts Bar]] OR [[:Hope Creek]] OR [[:Grand Gulf]] OR [[:Cooper]] OR [[:Sequoyah]] OR [[:Byron]] OR [[:Pilgrim]] OR [[:Arkansas Nuclear]] OR [[:Three Mile Island]] OR [[:Braidwood]] OR [[:Susquehanna]] OR [[:Summer]] OR [[:Prairie Island]] OR [[:Columbia]] OR [[:Seabrook]] OR [[:Brunswick]] OR [[:Surry]] OR [[:Limerick]] OR [[:North Anna]] OR [[:Turkey Point]] OR [[:River Bend]] OR [[:Vermont Yankee]] OR [[:Crystal River]] OR [[:Haddam Neck]] OR [[:Ginna]] OR [[:Diablo Canyon]] OR [[:Callaway]] OR [[:Vogtle]] OR [[:Waterford]] OR [[:Duane Arnold]] OR [[:Farley]] OR [[:Robinson]] OR [[:Clinton]] OR [[:South Texas]] OR [[:San Onofre]] OR [[:Cook]] OR [[:Comanche Peak]] OR [[:Yankee Rowe]] OR [[:Maine Yankee]] OR [[:Quad Cities]] OR [[:Humboldt Bay]] OR [[:La Crosse]] OR [[:Big Rock Point]] OR [[:Rancho Seco]] OR [[:Zion]] OR [[:Midland]] OR [[:Bellefonte]] OR [[:Fort Calhoun]] OR [[:FitzPatrick]] OR [[:McGuire]] OR [[:LaSalle]] OR [[:05000000]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] </code>.
[Table view]The following query condition could not be considered due to this wiki's restrictions on query size or depth: <code> [[:Beaver Valley]] OR [[:Millstone]] OR [[:Hatch]] OR [[:Monticello]] OR [[:Calvert Cliffs]] OR [[:Dresden]] OR [[:Davis Besse]] OR [[:Peach Bottom]] OR [[:Browns Ferry]] OR [[:Salem]] OR [[:Oconee]] OR [[:Nine Mile Point]] OR [[:Palisades]] OR [[:Palo Verde]] OR [[:Perry]] OR [[:Indian Point]] OR [[:Fermi]] OR [[:Kewaunee]] OR [[:Catawba]] OR [[:Harris]] OR [[:Wolf Creek]] OR [[:Saint Lucie]] OR [[:Point Beach]] OR [[:Oyster Creek]] OR [[:Watts Bar]] OR [[:Hope Creek]] OR [[:Grand Gulf]] OR [[:Cooper]] OR [[:Sequoyah]] OR [[:Byron]] OR [[:Pilgrim]] OR [[:Arkansas Nuclear]] OR [[:Three Mile Island]] OR [[:Braidwood]] OR [[:Susquehanna]] OR [[:Summer]] OR [[:Prairie Island]] OR [[:Columbia]] OR [[:Seabrook]] OR [[:Brunswick]] OR [[:Surry]] OR [[:Limerick]] OR [[:North Anna]] OR [[:Turkey Point]] OR [[:River Bend]] OR [[:Vermont Yankee]] OR [[:Crystal River]] OR [[:Haddam Neck]] OR [[:Ginna]] OR [[:Diablo Canyon]] OR [[:Callaway]] OR [[:Vogtle]] OR [[:Waterford]] OR [[:Duane Arnold]] OR [[:Farley]] OR [[:Robinson]] OR [[:Clinton]] OR [[:South Texas]] OR [[:San Onofre]] OR [[:Cook]] OR [[:Comanche Peak]] OR [[:Yankee Rowe]] OR [[:Maine Yankee]] OR [[:Quad Cities]] OR [[:Humboldt Bay]] OR [[:La Crosse]] OR [[:Big Rock Point]] OR [[:Rancho Seco]] OR [[:Zion]] OR [[:Midland]] OR [[:Bellefonte]] OR [[:Fort Calhoun]] OR [[:FitzPatrick]] OR [[:McGuire]] OR [[:LaSalle]] OR [[:05000000]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] </code>. |
UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF NUCLEAR REACTOR REGULATIONWASHINGTON, D.C. 20555April 12, 1988NRC INFORMATION NOTICE NO.' 88-12: OVERGREASING OF ELECTRIC MOTOR BEARINGS
Addressees
- All holders of operating licenses or construction permits for nuclear powerreactors.
Purpose
- This information notice is being provided to alert addressees to problemscaused by accumulation of grease on electric motors used to drive rotatingequipment in nuclear power plants. It is expected that recipients willreview the information for applicability to their facilities and consider-actions, as appropriate, to avoid similar problems. However, suggestionscontained in-this information notice do not constitute NRC requirements;therefore, no specific action or written response is required.
Description of Circumstances
- NRC personnel observed accumulations of grease on the air vent screens ofelectric motors used for driving such rotating equipment as fans and pumpsat the Millstone and Calvert Cliffs nuclear power plants. The grease ap-peared to have come from overgreasing of the electric motor bearings. Greasewas forced out of the bearing seals, onto the stator windings and rotor, fromwhere it either fell or was thrown onto the inside'of the motor housing. Be-cause of these observations, the NRC began an investigation 'into problems thathave been caused in the past, or could be caused in the future, by the over-greasing of electric motor bearings.Several electric motor overgreasing events were identified that have led tofailures of nuclear plant components:°- 'At a nuclear plant in 1975, overgreasing of the motor bearings caused thefailure of the containment cooler fans when 'a bearing failed and seized.° At Susquehanna Unit 1, on July 24, 1984, excessive'grease buildup in theSelectric motor of a motor generator set caused the set to'shut down andresulted in the spurious emergency actuations of the standby gas treatmentsystem and the control room emergency outside air system (LER 387/84-036).( 8000370
IN 88-12April 12, 1988 At Palisades Unit 1, overgreasing of the motor bearings caused the contain-ment cooler fans to fall on three different occasions: On July 7, 1986,overgreasing of the motor shaft bearings caused the bearings to skid in-stead of roll. This caused the motor to overheat and automatically shutdown. On August 8, 1986, and again on August 11, 1986, overgreasing causedthe motor bearings to deteriorate which, in turn, caused the motor and fanto vibrate, and bolts on the equipment to loosen and fall (LER 255/86-031).In addition to these overgreasing events, a number of cases have been reportedin which excessive motor bearing grease caused problems that were caught beforethe systems actually failed. For example, at a nuclear plant in 1978, exces-sive grease in a motor bearing in the service-water system caused the bearingto become abnormally hot and noisy. At another nuclear plant in 1986, greasefrom a bearing in the component cooling pump motor ran into the motor, causingit to smoke.Discussion:The NRC staff has solicited technical information and operating experience onthe problems caused by the overgreasing of electric motor bearings from motorand bearing manufacturers, as well as from other licensees. Their responsesare summarized in this discussion.Two basic mechanisms involving overgreasing of bearings can lead to the failureof electric motors:(1) The excess grease will leak out from the bearing seal and be depositedon the stator and rotor windings. The grease deposits create a thermalbarrier between the windings and their cooling air, leading to an increasein motor temperature. For motors designed to use outside air to cool thewindings, the temperature is increased still more by the buildup of dirt,dust, and other foreign materials that adhere to the grease. It is esti-mated that for every 10F rise in motor temperature, the insulation lifeof the windings is reduced by half. The deterioration of the windinginsulation then causes the motor to "short out".(2) The excess grease causes a "churning" action of the ball bearings withintheir housing, increasing the temperature of the grease and bearings.As the temperature approaches the upper functional design limit of thegrease, viscous or hard residues form, causing a breakdown of the lubri-cating characteristics of the grease. The bearing temperature then riseshigher, and eventually causes a reduction in bearing hardness and a sub-sequent breakdown of the bearing. A rule of thumb, based on certain
IN 88-12April 12, 1988 manufacturers1 tests, is that grease life is halved for every 250Fincrease in temperature and is doubled for every 250F decrease intemperature.High bearing temperature may also cause the inner race of the bearing toexpand and slip on the rotor shaft. The expansion and slippage of thebearing's inner race leads to a misalignment between the rotor shaft andthe bearing; this misalignment can cause contact between the rotor andstator. Once contact occurs, the windings short and burn out.One frequent cause of excess grease problems is the failure to provide an exitpath for the displaced grease when new grease is added. This can result fromthe failure to remove the grease drain plug, or from failure to unblock drainlines that have become plugged by hardened grease or dirt. Another frequentcause is the addition of too much grease. The correct amount must be deter-mined for each situation. Bearing manufacturers generally recommend fillingthe motor bearing void space from one-third to one-half full of grease. How-ever, the optimum amount can vary from 20% to 80% full, depending on suchfactors as the application of the motor, the environment of the motor, theretainer design, and the type of grease.The following actions can be taken to correct or prevent motor overgreasingand related problems:(1) Review motor lubrication procedures to ensure that they identify thetype and quantity of grease to use, the specific fill and drain nozzlesto uncap, and the length of time motors should be run with drain plugsoff after greasing the bearings.(2) To prevent foreign materials from contaminating the grease, ensure thatgrease containers are covered during periods of storage and that nozzlesand grease fittings are cleaned.(3) Determine the optimum quantity and correct type of grease required foreach motor by examining the manufacturer's recommendations and by monitor-Ing the behavior of grease added to motors.(4) Consider using prelubricated sealed bearings in applications where re-lubrication is difficult, where contaminants can adulterate the grease,or where overgreasing might damage safety systems.It should be noted that the vast majority of the reported lubrication-relatedincidents have been the result of underlubrication rather than overlubrication.This notice is not intended to discourage the adequate lubrication of motorbearings, but to prevent overgreasing problems by encouraging a thorough under-standing of correct lubrication procedures.
<- -oIN 88-12April 12, 1988 No specific action or written response is required by this information notice.If you have any questions about this matter, please contact the technicalcontact listed below or the Regional Administrator of the appropriate regionaloffice.Zarles E. Rossi DirectorDivision of Operational Events AssessmentOffice of Nuclear Reactor RegulationTechnical Contacts: James A. Prell, RI(215) 337-5108Donald C. Kirkpatrick, NRR(301) 492-1152Attachment: List of Recently Issued NRC Information Notices
IY-AttachmentIN 88-12April 12, 1988 LIST OF RECENTLY ISSUEDNRC INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to88-1188-1087-44,Supp. 188-0988-0888-0788-0688-05Potential Loss of MotorControl Center and/orSwitchboard Function Dueto Faulty Tie BoltsMaterials Licensees: Lackof Management Controls OverLicensed ProgramsThimble Tube Thinning inWestinghouse ReactorsReduced Reliability ofSteam-Driven AuxiliaryFeedwater Pumps Causedby Instability of WoodwardPG-PL GovernorsChemical Reactions withRadioactive WasteSolidification AgentsInadvertent Transfer ofLicensed Material toUncontrolled LocationsForeign Objects in SteamGeneratorsFire in Annunciator ControlCabinets4/7/883/28/883/28/883/18/883/14/883/7/882/29/882/11/88All holders of OLsor CPs for nuclearpower reactors.All NRC licenseesauthorized to usebyproduct material.All holders of OLsor CPs for nuclearpower reactors thatemploy a WestinghouseNSSS.All holders of OLsor CPs for nuclearpower reactors.All NRC licenseesgenerating or pro-cessing low levelradioactive waste.All NRC broad licenseesand licensees authorizedto possess byproductmaterial as sealedsources in teletherapyunits or 'self-contained"irradiators.All holders of OLsor CPs for PWRs.All holders of OLsor CPs for nuclearpower reactors.OL = Operating LicenseCP = Construction Permit
-IN 88-12April 12, 1988 No specific action or written response is required by this information notice.If you have any questions about this matter, please contact the technicalcontact listed below or the Regional Administrator of the appropriate regionaloffice.Charles E. Rossi, DirectorDivision of Operational Events AssessmentOffice of Nuclear Reactor RegulationTechnical Contacts:James A. Prell, RI(215) 337-5108Donald C. Kirkpatrick, NRR(301) 492-1152Attachment:List of Recently Issued NRC Information Notices*SEE PREVIOUS CONCURRENCES04/h/88 \*SELB:DEST:NRRFRosa03/28/88*OGCB:DOEA:NRRDCKirkpatrick03/24/88*C/OGCB:DOEA:NRR*PPMB:ARMCHBerlinger TechEd04/04/88 03/30/88*TPAB:DSP:AEOD *D/DEST:NRRMRHarper LCShao03/28/88 04/05/88*RIJAPrell03/25/88
1.1 4 -IN 88-XXApril xx, 1988 No specific action or written response is required by this information notice.If you have any questions about this matter, please contact the technicalcontact listed below or the Regional Administrator of the appropriate regionaloffice.Charles E. Rossi, DirectorDivision of Operational Events AssessmentOffice of Nuclear Reactor RegulationTechnical Contacts:James A. Prell, RI(215) 337-5108Donald C. Kirkpatrick, NRR(301) 492-1152Attachment:List of Recently Issued NRC Information Notices*SEE PREVIOUS CONCURRENCESD/DWEA:NRRCERossi04/ /88*SELB:DEST:NRRFRosa03/28/88*OGCB:DOEA:NRRDCKirkpatrick03/24/88*RIJAPrel 103/25/88*C/OGCB:DOEA:NRR*PPMB:ARMCHBerlinger TechEd04/04/88 03/30/88*TPAB:DSP:AEOD D/DEST:NRRMRHarper LCShao03/28/88 04 {_8' I
x'* j _IN 88-XXApril xx, 1988 No specific action or written response is required by this information notice.If you have any questions about this matter, please contact the technicalcontact listed below or the Regional Administrator of the appropriate regionaloffice.Charles E. Rossi, DirectorDivision of Operational Events AssessmentOffice of Nuclear Reactor ReaulationTechnical Contacts:James A. Prell, RI(215) 337-5108Donald C. Kirkpatrick, NRR(301) 492-1152Attachment:List of Recently Issued NRC Information Notices*SEE PREVIOUS CONCURRENCESD/DOEA:NRRCERossi04/ /88*TPAB:DSP:AEODMRHarper03/28/88C 4C/OGCB: DOEA: NRRCHBerlinger044 /88*P4B:ARMTechEd03/30/88*OGCB:DOEA:NRRDCKirkpatrick03/24/88*RIJAPrel 103/25/88*SELB:DEST:NRRFRosa03/28/88 IN 88-XXMarch xx, 1988 No specific action or written response is required by this information notice.If you have any questions about this matter, please contact the technicalcontact listed below or the Regional Administrator of the appropriate regionaloffice.Charles E. Rossi, DirectorDivision of Operational Events AssessmentOffice of Nuclear Reactor RegulationTechnical Contacts:James A. Prell, RI(215) 337-5108Donald C. Kirkpatrick, NRR(301) 492-1152Attachment:List of Recently Issued NRC Information Notices*Transmitted bydatedOGCB:DOEA:NRRDCKlirkpatric03i /88 D?/RI A5L *4SELB:DEST:NRRJAPrell FRosa fIt Phefi03/AQ788 03/2t/88D/DOEA:NRRCERossi03/ /88TPAB:DSP:AEODMRHarper i03/2[r/88 AC/OGCB:DOEA:NRRCHBerlinger03/ /88PPMB:ARMTechEd i 903/Jo/88 Wo '
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list | - Information Notice 1988-01, Safety Injection Pipe Failure (27 January 1988, Topic: Unidentified leak, Water hammer)
- Information Notice 1988-03, Cracks in Shroud Support Access Hole Cover Welds (2 February 1988, Topic: Stolen)
- Information Notice 1988-04, Inadequate Qualification and Documentation of Fire Barrier Penetration Seals (5 February 1988, Topic: Fire Barrier, Fire Watch, Stolen)
- Information Notice 1988-05, Fire in Annunciator Control Cabinets (12 February 1988, Topic: Stolen)
- Information Notice 1988-06, Foreign Objects in Steam Generators (29 February 1988, Topic: Stolen)
- Information Notice 1988-07, Inadvertent Transfer of Licensed Material to Uncontrolled Locations (7 March 1988, Topic: Stolen)
- Information Notice 1988-08, Chemical Reactions with Radioactive Waste Solification Agents (14 March 1988, Topic: Process Control Program, Stolen)
- Information Notice 1988-09, Reduced Reliability of Steam-Driven Auxiliary Feedwater Pumps Caused by Instability of Woodward PG-PL Type Governors (18 March 1988)
- Information Notice 1988-10, Memo of Understanding Between NRC and OSHA Relating to NRC-Licensed Facilities (53 FR 43950, October 31, 1988) (23 December 1988)
- Information Notice 1988-10, Memo of Understanding Between NRC and OSHA Relating to NRC-Licensed Facilities (53 Fr 43950, October 31, 1988) (23 December 1988, Topic: Fatality, Overexposure)
- Information Notice 1988-10, Memorandum of Understanding Between NRC and Osha Relating to NRC-Licensed Facilities (53 Fr 43950, October 31, 1988. (23 December 1988, Topic: Fatality, Overexposure)
- Information Notice 1988-11, Potential Loss of Motor Control Center And/Or Switchboard Function Due to Faulty Tie Bolts (7 April 1988)
- Information Notice 1988-12, Overgreasing of Electric Motor Bearings (12 April 1988)
- Information Notice 1988-13, Water Hammer & Possible Piping Damage Caused by Misapplication of Kerotest Packless Metal Diaphragm Globe Valves (18 April 1988)
- Information Notice 1988-14, Potential Problems with Electrical Relays (18 April 1988)
- Information Notice 1988-15, Availability of Us Food & Drug Administration (FDA) Approved Potassium Iodide for Use in Emergencies Involving Radioactive Iodine (18 April 1988)
- Information Notice 1988-15, Availability of Us Food & Drug Administration (Fda) Approved Potassium Iodide for Use in Emergencies Involving Radioactive Iodine (18 April 1988)
- Information Notice 1988-16, Identify Waste Generators in Shipments of Low-Level Waste to Land Disposal Facilities (22 April 1988, Topic: Water hammer)
- Information Notice 1988-17, Summary of Responses to NRC Bulletin 87-01, Thinning of Pipe Walls in Nuclear Power Plants. (22 April 1988, Topic: Safe Shutdown, Weld Overlay, Feedwater Heater, Through-Wall Leak, Water hammer)
- Information Notice 1988-18, Malfunction of Lockbox on Radiography Device (25 April 1988, Topic: Overexposure)
- Information Notice 1988-19, Questionable Certification of Class Ie Components (26 April 1988, Topic: Water hammer)
- Information Notice 1988-19, Questionable Certification of Class IE Components (26 April 1988)
- Information Notice 1988-20, Unauthorized Individuals Manipulating Controls and Performing Control Room Activities (5 May 1988)
- Information Notice 1988-21, Inadvertent Criticality Events at Oskarshamn and at U.S. Nuclear Power Plants (9 May 1988, Topic: Shutdown Margin)
- Information Notice 1988-22, Disposal of Sludge from Onsite Sewage Treatment Facilities at Nuclear Power Stations (12 May 1988)
- Information Notice 1988-23, Potential for Gas Binding of High-Pressure Safety Injection Pumps During a Loss-Of-Coolant Accident (12 May 1988)
- Information Notice 1988-24, Failures of Air-Operated Valves Affecting Safety-Related Systems (13 May 1988)
- Information Notice 1988-25, Minimum Edge Distance for Expansion Anchor Bolts (16 May 1988, Topic: Earthquake)
- Information Notice 1988-26, Falsified Pre-Employment Screening Records (16 May 1988)
- Information Notice 1988-27, Deficient Electrical Terminations Identified in Safety-Related Components (18 May 1988)
- Information Notice 1988-28, Potential for Loss of Post-Loca Recirculation Capability Due to Insulation Debris Blockage (19 May 1988, Topic: Coatings)
- Information Notice 1988-29, Deficiencies in Primary Containment Low-Voltage Electrical Penetration Assemblies (24 May 1988)
- Information Notice 1988-30, Target Rock Two-State SRV Setpoint Drift Update (25 May 1988)
- Information Notice 1988-31, Steam Generator Tube Rupture Analysis Deficiency (25 May 1988)
- Information Notice 1988-32, Prompt Reporting to NRC of Significant Incidents Involving Radioactive Material (25 May 1988)
- Information Notice 1988-33, Recent Problems Involving the Model Spec 2-T Radiographic Exposure Device (27 May 1988)
- Information Notice 1988-34, Nuclear Material Control & Accountability of Non-Fuel Special Nuclear Material at Power Reactors (31 May 1988)
- Information Notice 1988-36, Possible Sudden Loss of RCS Inventory During Low Coolant Level Operation (8 June 1988)
- Information Notice 1988-37, Flow Blockage of Cooling Water to Safety System Components (14 June 1988, Topic: Ultimate heat sink)
- Information Notice 1988-38, Failure of Undervoltage Trip Attachment of General Electric Circuit Breakers (15 June 1988)
- Information Notice 1988-39, Loss of Recirculation Pumps with Power Oscillation Event (15 June 1988)
- Information Notice 1988-40, Examiners' Handbook for Developing Operator Licensing Examinations (22 June 1988)
- Information Notice 1988-41, Physical Protection Weaknesses Identified Through Regulatory Effectiveness Reviews (RERs) (22 June 1988)
- Information Notice 1988-41, Physical Protection Weaknesses Identified Through Regulatory Effectiveness Reviews (Rers) (22 June 1988)
- Information Notice 1988-42, Circuit Breaker Failures Due to Loose Charging Spring Motor Mounting Bolts (23 June 1988, Topic: Loctite)
- Information Notice 1988-43, Solenoid Valve Problems (23 June 1988, Topic: Stroke time)
- Information Notice 1988-44, Mechanical Binding of Spring Release Device in Westinghouse Type DS-416 Circuit Breakers (24 June 1988)
- Information Notice 1988-45, Problems in Protective Relay & Circuit Breaker Coordination (7 July 1988, Topic: Safe Shutdown)
- Information Notice 1988-46, Licensee Report of Defective Refurbished Circuit Breakers (8 July 1988)
- Information Notice 1988-47, Slower-than-Expected Rod-drop Times (14 July 1988)
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