Leaking Shutdown Cooling Isolation Valves at Cooper Nuclear StationML031060492 |
Person / Time |
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Site: |
Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Mcguire, 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, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant ![Entergy icon.png](/w/images/7/79/Entergy_icon.png) |
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Issue date: |
08/19/1994 |
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From: |
Grimes B K Office of Nuclear Reactor Regulation |
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To: |
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References |
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IN-94-030, Suppl 1, NUDOCS 9408160070 |
Download: ML031060492 (9) |
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Similar Documents at Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Mcguire, 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, 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 [[:Mcguire]] 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 [[: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 [[:Mcguire]] 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 [[: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. 20555August 19, 1994NRC INFORMATION NOTICE 94-30, SUPPLEMENT 1: LEAKING SHUTDOWN COOLINGISOLATION VALVES ATCOOPER NUCLEAR STATION
Addressees
All holders of operating licenses or construction permits for nuclear powerreactors.
Purpose
The U.S. Nuclear Regulatory Commission (NRC) is issuing this informationnotice (IN) supplement to clarify the type of valve discussed in the originalnotice and to alert recipients to the potential that local leak rate testingof primary containment isolation valves with pressure applied in the directionopposite of the accident direction may not be conservative. It is expectedthat recipients will review the information for applicability to theirfacilities and consider actions, as appropriate, to avoid similar problems.However, suggestions contained in this information notice are not NRCrequirements; therefore, no specific action or written response is required.BackgroundThe NRC issued IN 94-30, "Leaking Shutdown Cooling Isolation Valves at CooperNuclear Station," on April 12, 1994, to alert addressees to a precursor to anunisolable rupture of shutdown cooling piping with the potential for coredamage and release of radioactive material outside the containment. In thatevent, after receiving a high-pressure alarm for the suction piping in theresidual heat removal system, the licensee measured the leakage through theinboard isolation valve, established a bleedoff path into the pressuremaintenance system and continued operations. About 10 months later, thelicensee disassembled the inboard and outboard valves and found cracks in theseating surfaces of both valves.During the preparation of IN 94-30, the staff determined that a concern mayexist regarding the method used for testing of primary containment isolationvalves. This concern is described below. In addition, the NRC has receivedinformation from Anchor/Darling Valve Company that the description of thevalves in IN 94-30, "Anchor-Darling 20-inch nominal, double-disk, flex-wedge,gate valves," is incorrect. The correct description is, "a 20 inch, 900class, flex wedge gate valve," manufactured by the Anchor Valve Company beforethe merger that formed the Anchor/Darling Valve Company. In IN 94-30, the NRCstaff was concerned about the actions of the licensee after the valve leakagewas identified regardless of the valve type or manufacturer.Gs tAiJ4-:&ge q 3 0199408160070illpt- -( IN 94-30, Supplement 1August 19, 1994
Description of Circumstances
On May 1, 1993, after evaluating the results of local leak rate testing forseveral inboard primary containment isolation valves, the licensee for theCooper Nuclear Station (Cooper) determined that the testing methodology usedfor Appendix J, Type C tests of certain flex-wedge gate valves could not berelied on to be equivalent to or more conservative than testing the valves inthe accident direction. The Type C tests for several such valves had beenperformed with the pressure applied in the direction opposite to the accidentdirection (reverse direction). The licensee began corrective actions andnotified the NRC in Licensee Event Report (LER)93-019, dated June 1, 1993.In LER 93-019, the licensee reported that the testing of these valves in thereverse direction was based on an incorrect interpretation of information fromthe valve manufacturer. In response to a question from the licensee regardingthe acceptability of valve test methods, the manufacturer had indicated thattesting in the reverse direction would not be expected to affect test results,but an unqualified answer could not be provided. Results of recent tests bythe licensee of some of the primary containment isolation valves with pressureapplied in the accident direction, indicate that testing in the reversedirection may not be equivalent to or more conservative than testing in theaccident direction; therefore earlier test results may not be valid.LER 93-019 indicated that Cooper Nuclear station has 65 inboard primarycontainment valves of various types and from various manufacturers. Thelicensee found that 24 of those valves were of concern. Of the 24 valves,8 could be tested in the accident direction but, before the 1993 refuelingoutage, were not. The other 16 valves could not be tested in the accidentdirection nor had testing in the reverse direction been qualified to beequivalent or more conservative than testing in the accident direction. Formost of these valves, the licensee qualified testing in the reverse directionto be equivalent or more conservative or modified the testing configuration toallow testing the valve in the accident direction. For the remaining valves,the licensee requested exemptions from certain Appendix J requirements toallow leak .rate testing in the reverse' direction.Discussion'Appendix J to Title 10 of the Code of Federal Regulations Part 50 requires aprogram for leak testing the primary reactor containment and related systemsand components penetrating the primary containment pressure boundary.Section III.C.1 of Appendix J specifies that, for Type C tests of valves(local leak rate tests), the pressure shall be applied in the same directionas that when the valve would be required to perform its safety function,unless it can be determined that the results from the tests for a pressureapplied in a different direction will provide equivalent or more conservativeresults. This requirement is intended to ensure that test leak rates arerepresentative of leak rates that would be experienced under actual accidentconditions. As described above, the licensee for Cooper found that, for someof the primary containment isolation valves, testing in the reverse directionwas not equivalent to or more conservative than testing in the accidentdirectio IN 94-30, Supplement 1August 19, 1994 Related Generic Communications* NRC IN 86-16, "Failures to Identify Containment Leakage Due toInadequate Local Leak Rate Testing," March 11, 1986.* NRC IN 92-20, Inadequate Local Leak Rate Testing,' March 3, 1992.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian s, Director QDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact: Jim Pulsipher, NRR(301) 504-2811
Attachment:
List of Recently Issued NRC Information Noticess&C 3 Lo AttachmentIN 94-30, Supp. 1August 19, 1994 LIST OF RECENTLY ISSUEDNRC INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to94-5994-5894-5794-5694-55Accelerated Dealloying ofCast Aluminum-BronzeValves Caused by Micro-biologically InducedCorrosionReactor Coolant PumpLube Oil FireDebris in Containmentand the Residual HeatRemoval SystemInaccuracy of Safety ValveSet Pressure DeterminationsUsing Assist DevicesProblems with Copes-Vulcan PressurizerPower-Operated ReliefValvesDeficiencies Found inThermo-Lag Fire BarrierInstallationFailures of GeneralElectric Magne-BlastCircuit Breakers toLatch ClosedPossible Malfunction ofWestinghouse ARD, BFD,and NBFD Relays, andA200 DC and DPC 250Magnetic Contactors08/17/9408/16/9408/12/9408/11/9408/04/9408/04/9408/01/9407/29/94All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor pressurized waterreactors.All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactors.91-79,Supp. 194-5491-45,Supp. 194-42,Supp. 1Cracking in the LowerRegion of the Core Shroudin Boiling-Water Reactors07/19/94All holdersfor boiling(BWRs).of OLs or CPswater reactorsOL = Operating LicenseCP = Construction Permit V IN '-30, Supplement 1August 19, 1994 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.orig /s/'d by CIGrimes/forBrian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact: Jim Pulsipher, NRR(301) 504-2811
Attachment:
List of Recently Issued NRC Information NoticesSPraa Proevintic rnnmirronreOFFICE SCSB:DSSA:NRR SCSB:DSSA:NRR C/SCSB:DSSA:NRR D/DSSA:NRRNAME I JPulsifer* RLobel* RBarrett* GHolahan*DATE 07/17/94 1 07/19/94 08/03/94 08/04/94OFFICE I TECH ED OGCB:DORS:NRR AC/OGCB:DORS:NRR D/DORS:JNI2,aNAME RSanders* JBirmingham* ELDoolittle* BKGrimesDATE 6/14/94 1 08/03/94 08/04/94 ,08/ t194UN .-ILALUUU A'4 rptt ^t- u IitOFFIIAL UULUMMNI NAMEL:Y4-30SH .AN I " 4-30, Supplement 1August XX, 1994 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact:Jim Pulsipher, NRR(301) 504-2811
Attachment:
List of Recently Issued NRC Information Notices* See Previnus ConcurrenceOFFICE SCSB:DSSA:NRR SCSB:DSSA:NRR C/SCSB:DSSA:NRR D/DSSA:NRRNAME JPulsifer* RLobel* RBarrett* GHolahan*DATE 07/17/94 07/19/94 , 08/03/94 08/04/94OFFICE TECH ED OGCB:DORS:NRR AC/OGCB:DORS:NRR D/DORS:NRRNAME RSanders* JBirmingham* ELDoolittle* BKGrimesDATE 06/14/94 08/03/94 1 08/04/94 08/ /94v_ -ace--- --..- .^ ... _ eae .-.n ... ... -AOFFICIAL OUCUMNI NArt:U:\1N Y4JUb.LUb IN"4-30, Supplement 1August XX, 1994 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact:Jim Pulsipher, NRR(301) 504-2811
Attachment:
List of Recently Issued NRC Information NoticesA* See Previnut CnncurrenceOFFICE SCSB:DSSA:NRR SCSB:DSSA:NRR C/SCSB:DSSA:NRR RRNAME JPulsifer* RLobel* RBarrett* GHolahanDATE 07/17/94 07/19/94 08/03/94 08/e/94OFFICE TECH ED OGCB:DORS:NRR AC lBO DORS:NRR D/DORS:NRRNAME RSanders* JBirmingham* E 6 ttle BKGrimesDATE 06/14/94 08/03/94 08/4 /94 08/ /94OICA DO. MN NAE G.. ._ ..4. ..JOFFICIAL DOCUMENT NAME:6:\IN 9430S.JLB IN 44-30, Supplement 1August XX, 1994 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact:Jim Pulsipher, NRR(301) 504-2811
Attachment:
List of Recently Issued NRC Information Notices* See Previous ConcurrenceAOFFICE lSCSB:DSSA:NRR SCSB:DSSA:NRR C/SCS A:NRR AD/DSSA:NRRNAME JPulsifer* RLobel* l aWVrgllolDATE 07/17/94 07/19/94 !08/;7/94 08/ /94OFFICE TECH ED OGCB:DORS:NRR AC/OGCB:DORS:NRR D/DORS:NRRNAME RSanders* JBirmingham ELDoolittle BKGrimesDATE 06/14/94 08/ 3 /94 .08/ /94 08/ /94a.-.-. a. a. anna ...r&*, a.r. **a A 1A .i 1 DoUMLI16AL UUUUMtN1 I `t:IN Y4JV3 .UL0 IN 94-30, Supplement 1June XX, 1994 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact:Jim Pulsipher, NRR(301) 504-2811
Attachment:
List of Recently Issued NRC Information Notices* See Previous Concurrence 1i'OFFICE S 5 SCSB:DSSA:NRR C/SCSB:DSSA:NRR D/DSSA:NRRNAME JPulsige ZtG RBarrett MVirgiliol DATE _ _06/17/94 i /94/06/ /94 06/ /94OFFICE TECH ED 9 OGCB:DORS:NRR C/OGCB:DORS:NRR D/DORS:NRRNAME RSander JBirmingham RDennig BKGrimesDATE 06/14/94 I06/ /94 06/ /94 06/ /94OFF116lAL VULUMtNI NAMLiNr3 JU1.dJLU
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list | - Information Notice 1994-01, Turbine Blade Failures Caused by Torsional Excitation from Electrical System Disturbance (7 January 1994)
- Information Notice 1994-02, Inoperability of General Electric Magne-Blast Breaker Because of Misalignment of Close-Latch Spring (7 January 1994)
- Information Notice 1994-03, Deficiencies Identified During Service Water System Operational Performance Inspections (11 January 1994, Topic: Biofouling)
- Information Notice 1994-04, Digital Integrated Circuit Sockets with Intermittent Contact (14 January 1994)
- Information Notice 1994-05, Potential Failure of Steam Generator Tubes with Kinetically Welded Sleeves (19 January 1994, Topic: Stress corrosion cracking)
- Information Notice 1994-06, Potential Failure of Long-Term Emergency Nitrogen Supply for the Automatic Depressurization System Valves (28 January 1994)
- Information Notice 1994-07, Solubility Criteria for Liquid Effluent Releases to Sanitary Sewerage Under the Revised 10 CFR Part 20 (28 January 1994)
- Information Notice 1994-08, Potential for Surveillance Testing to Fail to Detect an Inoperable Main Steam Isolation Valve (1 February 1994)
- Information Notice 1994-09, Release of Patients with Residual Radioactivity from Medical Treatment & Control of Areas Due to Presence of Patients Containing Radioactivity Following Implementation of Revised 10 CFR Part 20 (3 February 1994, Topic: Brachytherapy)
- Information Notice 1994-10, Failure of Motor-Operated Valve Electric Power Train Due to Sheared or Dislodged Motor Pinion Gear Key (4 February 1994)
- Information Notice 1994-11, Turbine Overspeed and Reactor Cooldown During Shutdown Evolution (8 February 1994)
- Information Notice 1994-12, Insights Gained from Resolving Generic Issue 57: Effects of Fire Protection System Actuation on Safety-Related Equipment (9 February 1994, Topic: Overspeed trip)
- Information Notice 1994-13, Unanticipated and Unintended Movement of Fuel Assemblies and Other Components Due to Improper Operation of Refueling Equipment (28 June 1994)
- Information Notice 1994-14, Failure to Implement Requirements for Biennial Medical Examinations and Notification to the NRC of Changes in Licensed Operator Medical Conditions (24 February 1994)
- Information Notice 1994-15, Radiation Exposures During an Event Involving a Fixed Nuclear Gauge (2 March 1994)
- Information Notice 1994-16, Recent Incidents Resulting in Offsite Contamination (3 March 1994)
- Information Notice 1994-17, Strontium-90 Eye Applicators: Submission of Quality Management Plan (QMP), Calibration, and Use (11 March 1994, Topic: Brachytherapy)
- Information Notice 1994-17, Strontium-90 Eye Applicators: Submission of Quality Management Plan (Qmp), Calibration, and Use (11 March 1994, Topic: Brachytherapy)
- Information Notice 1994-18, Accuracy of Motor-Operated Valve Diagnostic Equipment (Responses to Supplement 5 to Generic Letter 89-10) (16 March 1994)
- Information Notice 1994-19, Emergency Diesel Gemerator Vulnerability to Failure from Cold Fuel Oil (16 March 1994)
- Information Notice 1994-20, Common-Cause Failures Due to Inadequate Design Control and Dedication (17 March 1994)
- Information Notice 1994-21, Regulatory Requirements When No Operations Are Being Performed (18 March 1994)
- Information Notice 1994-22, Fire Endurance & Ampacity Derating Test Results for 3-Hour Fire-Rated Thermo-Lag 330-1 Fire Barriers (16 March 1994, Topic: Fire Barrier)
- Information Notice 1994-23, Guidance to Hazardous, Radioactive and Mixed Waste Generators on the Elements of a Waste Minimization Program (25 March 1994, Topic: Fire Barrier)
- Information Notice 1994-24, Inadequate Maintenance of Uninterruptible Power Supplies & Inverters (24 March 1994, Topic: Safe Shutdown, Fire Barrier)
- Information Notice 1994-25, Failure of Containment Spray Header Valve to Open Due to Excessive Pressure from Inertial Effects of Water (15 March 1994, Topic: Fire Barrier)
- Information Notice 1994-26, Personnel Hazards and Other Problems from Smoldering Fire-Retardant Material in the Drywell of a Boiling-Water Reactor (28 March 1994, Topic: Fire Barrier)
- Information Notice 1994-27, Facility Operating Concerns Resulting from Local Area Flooding (31 March 1994, Topic: Fire Barrier)
- Information Notice 1994-28, Potential Problems with Fire-Barrier Penetration Seals (5 April 1994, Topic: Fire Barrier)
- Information Notice 1994-29, Charging Pump Trip During a Loss-of-Coolant Event Caused by Low Suction Pressure (11 April 1994, Topic: Boric Acid)
- Information Notice 1994-30, Leaking Shutdown Cooling Isolation Valves at Cooper Nuclear Station (19 August 1994, Topic: Fire Barrier)
- Information Notice 1994-31, Potential Failure of Wilco, Lexan-Type HN-4-L Fire Hose Nozzles (14 April 1994, Topic: Hydrostatic)
- Information Notice 1994-32, Revised Seismic Estimates (29 April 1994, Topic: Earthquake)
- Information Notice 1994-33, Capacitor Failures in Westinghouse Eagle 21 Plant Protection Systems (9 May 1994, Topic: Stress corrosion cracking)
- Information Notice 1994-34, Thermo-LAG 330-660 Flexi-Blanket Ampacity Derating Concerns (13 May 1994, Topic: Fire Barrier)
- Information Notice 1994-35, Niosh Respirator User Notices, Inadvertent Separation of the Mask-Mounted Regulator(Mmr) from the Facepiece on the Mine Safety Appliances (16 May 1994)
- Information Notice 1994-35, Niosh Respirator User Notices, Inadvertent Separation of the Mask-Mounted Regulator(MMR) from the Facepiece on the Mine Safety Appliances (16 May 1994)
- Information Notice 1994-36, Undetected Accumulation of Gas in Reactor Coolant System (24 May 1994, Topic: Reactor Vessel Water Level, Stress corrosion cracking, Integrated leak rate test)
- Information Notice 1994-37, Misadministration Caused by a Bent Interstitial Needle During Brachytherapy Procedure (27 May 1994, Topic: Brachytherapy)
- Information Notice 1994-38, Results of Special NRC Inspection at Dresden Nuclear Power Station, Unit 1 Following Rupture of Service Water Inside Containment (27 May 1994)
- Information Notice 1994-39, Identified Problems in Gamma Stereotactic Radiosurgery (31 May 1994)
- Information Notice 1994-40, Failure of a Rod Control Cluster Assembly to Fully Insert Following a Reactor Trip at Braidwood, Unit 2 (26 May 1994)
- Information Notice 1994-41, Problems with General Electric Type Cr124 Overload Relay Ambient Compensation (7 June 1994)
- Information Notice 1994-41, Problems with General Electric Type CR124 Overload Relay Ambient Compensation (7 June 1994)
- Information Notice 1994-42, Cracking in the Lower Region of the Core Shroud in Boiling-Water Reactors (7 June 1994)
- Information Notice 1994-43, Determination of Primary-to-Secondary Steam Generator Leak Rate (10 June 1994, Topic: Grab sample)
- Information Notice 1994-44, Main Steam Isolation Valve Failure to Close on Demand Because of Inadequate Maintenance and Testing (16 June 1994)
- Information Notice 1994-44, Main Steam Isolation Valve Failure to Close on Demand because of Inadequate Maintenance and Testing (16 June 1994)
- Information Notice 1994-45, Potential Common-Mode Failure Mechanism for Large Vertical Pumps (17 June 1994, Topic: Biofouling)
- Information Notice 1994-46, Nonconservative Reactor Coolant System Leakage Calculation (20 June 1994)
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