Preliminary Results of Validation Testing of Motor-Operated Valve Diagnostic EquipmentML031190195 |
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: |
09/30/1991 |
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From: |
Rossi C Office of Nuclear Reactor Regulation |
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To: |
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References |
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IN-91-061, NUDOCS 9109240245 |
Download: ML031190195 (6) |
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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 Contamination2006-07-13013 July 2006 E-mail from M. 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 STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555 September 30, 1991 NRC INFORMATION NOTICE 91-61: PRELIMINARY RESULTS OF.VALIDATION TESTING OF
MOTOR-OPERATED VALVE DIAGNOSTIC EQUIPMENT
Addressees
All holders of operating licenses or construction permits for nuclear power
reactors and motor-operated valve (MOV) diagnostic equipment vendors-identified
herein.
Purpose
The U.S. Nuclear Regulatory Commission(NRC) 'is'issuing this information notice
to alert addressees to the'preliminary: results of the validation testing of MOV
diagnostic equipment.conducted..by.the MOV.user's group (MUG) of nuclear power:
plant licensees. It is expected that recii'ents will review the information,.
for applicability to their facilities and consider actions, as appropriate, to
avoid operability problems with MOVs. However, suggestions contained in this
information notice are not NRC requirements; therefore, no-specific action or
written response is required. _ .
Description of Circumstances
'
In 1990, the MUG initiated a program to conduct tests of MOV diagnostic equip- ment to validate'the accuracy of the equipment asserted by the diagnostic
equipment vendors. .The MUG requested the Idaho National Engineering-Laboratory
(INEL) to provide a test.stand for the 'progrIam and to collect test data. The- NRC Office of..Nuclear Regulatory Research (RES.) provided funds for INEL to
participate, with the stipulation that the resu'lts'of the testing would be made
available to the NRC and the public. .
The diagnostic equipment vendors participating in.the MUG test program were
ASEA-Brown'Boveri (ABB) Impell, ITI-MOVATS, Liberty Technologies, Siemens/KWU,
Teledyne, and Wyle Laboratories.
The INEL test'stand included a Limitorque motor operator which drives a valve
stem into a water reservoir with a compressed air overcharge. INEL obtained
accurate measurements of actuator torque and'tthrust using a torque arm and a
stem-mounted load cell, respectively. Each diagnostic equipment vendor
installed and operated its own equipment to obtain measurements of torque, thrust, and various other parameters.
Several diagnostic system vendors did not meet all of their stated claims of
accuracy. Differences in the time response of the INEL test stand equipment
dia nostic systems being tested may have contributed to deviations in
0924O24 Z
IN 91-61 September 30, 1991 the observed thrust measurements. Further, some of the diagnostic equipment
exhibited problems and anomalies, such as failed sensors or difficulties in
calibration, during the testing program. Of particular concern to the NRC is
that these time inaccuracies, problems, and anomalies may not have been
detected during normal use of the diagnostic equipment at a nuclear facility.
The MUG is comparing the data collected by INEL with the data collected by each
of the diagnostic equipment vendors. At a meeting in Richmond, Virginia, on
July 30, 1991, the MUG released a progress report of the validation
testing. The NRC has placed this report, "MOV User's Group - Progress Report
of the Validation Committee," in the NRC Public Document Room (PDR),
2120 L Street, N.W., Washington, D.C. 20555 (telephone (202) 634-3273). The
MUG is continuing to review the test data and intends to release a final report
in January 1992. The NRC will place the final MUG report in the PDR.
During its July meeting, the MUG stated that licensees and diagnostic equipment
vendors should review the progress report for its applicability to the MOVs
installed in nuclear power plants. The MUG also alerted licensees and diagnos- tic equipment vendors to their responsibilities under "Reporting of Defects and
Noncompliance," Part 21 of Title 10 of the Code of Federal Regulations.
Discussion of Safety Significance
In NRC Bulletin 85-O37"'Rot6fr-Operated Valve Common Mode-F-ai flres During Plant
Transients Due to Improper Switch Settings," and its supplement, the NRC
recommended that licensees develop and implement a program to ensure that
motor-operator switch settings for MOVs in several specified systems are
selected, set, and maintained so that the MOYs will operate under design-basis
conditions for the life of the plant. In NRC Generic Letter 89-10,
"Safety-Related Motor-Operated Valve Testing and Surveillance," and its supple- ments, the NRC recommended that the program to verify switch settings be
extended to ensure MOVs.operate properly in all safety-related fluid systems.
To meet the recommendations of the bulletin and the generic letter, licensees
have placed increasing reliance on diagnostic equipment to set the motor
operator switches and to ensure the operability of MOVs. The accuracy of the
diagnostic equipment has a direct impact on the operability of entire safety
systems because the same diagnostic equipment is generally used to set the
motor operator switches of the valves in all trains of a safety system.
This concern for the effect that the use of diagnostic equipment can have on
overall system operability prompted NRC to participate in the MUG validation
testing. The NRC will continue to monitor the activities of licensees and
diagnostic equipment vendors in evaluating the results of the MUG test program.
IN 91-61 September 30, 1991 This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact one
of the technical contacts listed below or the appropriate Office of Nuclear
Reactor Regulation project manager.
ckg
Charles E. Rossi, Director
<4't
t 1J
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical contacts: Thomas G. Scarbrough, NRR
(301) 492-0794 Owen 0. Rothberg, RES
(301) 492-3924 Attachment: List of Recently Issued NRC Information Notices
Attachment - --
I . F -. 1 9141 September 30, 1991 page I of I
LIST OF RECENTLY ISSUED
NRCINFORMATION NOTICES
Information Date of
Notice No. Subject Issuance Issued to
91-60 False Alarms of Alarm 09/24/91 All Nuclear Resulatory Cor- Ratemeters Because of mission (NRC) icensees
aediofrequency Inter- authorized to use saled
ference sources for industrial
rediography.
91-59 Problems with Access 09/23/91 All holders of 0US or CPs
Authorization Progras for nuclear power reactors.
91-58 Dependency of Offset 09/20/91 All holders of OLs or CPs
Disc Butterfly Valves for nuclear power reactors.
Operation on Orientation
with Respect to Flow
91-57 Operational Esperienc 09/19/91 All holders of OLs or CPs
on us Tnrnsfers for nuclear power reactors.
91-56 Potential Radioactive 09/19/91 All holders of OLsor CPs
Leakage to Tank Vented for nuclear power reactors.
to Atmosphenr
S1-S5 Failures Caused by An 09/16/91 All holders of OLsor CPs
Improperly Adjusted Test for nuclear power reactors.
Link In 4.16 KW6eneral
Electric Switchgear
BS-16. Failures of Undernoltcge 09/10/91 All holders of OLSor CPs for
Supp. I Output Circuit Boards In Westinghouse (W1)-designed
the NestinghouseDesaigned nuclear power reactors.
Solid State Protection
System
91-54 Foreign Experience begard- 09/06191 All holders of OLs or CPs
lng Boron Dilution for pressurized water
reactors (PtRS).
- 9-90 Pressurizer Safety Vnlve 09/05/91 All holders of OLSor CPs.
Supp. 2 Lift Setpoint Shift for nuclear power reactors.
eL
CP
IN 91-XX
August XX, 1991 This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact
one of the technical contacts listed below or the appropriate Office of
Nuclear Reactor Regulation project manager.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical contacts: Thomas G. Scarbrough, NRR
(301) 492-0794 Owen 0. Rothberg, RES
(301) 492-3924 Attachment: List of Recently Issued NRC Information Notices
OFC :C:EIB:DSIR:RES:D:DS v RES:C:OGCB:DOEA:NRR:D:DOEA:NRR:
NAME :RL6 iel 2 : ers :CHBerlinger :CERossi
DATE: /; /91 -09/I /91 :08/ /91 :08/ /91 :
OFC :OGCB:DOEA:NRR:TEd:FIPS:ADM:EMEB * :NRR:CE :NRR:D :EIB:DSIR:RES:
-------- : ---- :-C ik ----- : a.s i,-: ------------
NAME :RJKiessel :JMain 9 n :TG carbrough:J : ERcha
sg d's'n:OORothberg :
----- ------
DATE :08/) 91X :08/2C/91 :P7/3 /91 WK7i /91i--/- -/ ; /91/1 $X
ocument am UJ VALIDAT N W/amwiv-"k
IN 91-XX
September XX, 1991 This Information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact one
of the technical contacts listed below or the appropriate Office of Nuclear
Reactor Regulation project manager.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical contacts: Thomas G. Scarbrough, NRR
(301) 492-0794 Owen 0. Rothberg, RES
(301) 492-3924 Attachment: List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
OFC *C:EIB:DSIR:RES*D:DSIR:RES:C:OGCB:DOEA:NRR:D:DOEA:NRR:
__ _ _- ------------------------
-- -----------
NAME :RLBaer :WMinners :CH~ar gt---J :CERoss -- ::
DATE :09/06/91 :09/06/91 :09/17/91 :09/ /91 :
OFC *OGCB:DOEA:NRR*TEd:FIPS:ADM*EMEB:DET:NRR*C/EMEB:DET:NRR*D:DET:NRR *EIB:DSIR:RES:
____- ___------___-___-_______ -__ -___ -_-___:-------------_:_-----------:------------:
NAME :RJKiessel :JMain :TGScarbrough:JANorberg :JERichardson:OORothberg :
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DATE :08/26/91 :08/26/91 :09/03/91 :09/03/91 :09/03/91 :09/04/91 Document Name: MUG VALIDATION TESTING IN
- .IN 91-61 September 30, 1991 This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact one
of the technical contacts listed below or the appropriate Office of Nuclear
Reactor Regulation project manager.
(~e go
114Lkharles E. Rossi, Director
( Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical contacts: Thomas G. Scarbrough, NRR
(301) 492-0794 Owen 0. Rothberg, RES
(301) 492-3924 Attachment: List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES e
OFC *C:EIB:DSIR:RES*D:DSIR:RES:*C:OGCB:DbOEA:NRR:D-.DUEA:NR X- :
NAME :RLBaer :WMinners : CHBerlinger :CERossi :
DATE :09/06/91 :09/06/91 : 09/17/91 :09 f 90 : :
OFC *OGCB:DOEA:NRR*TEd:FIPS:ADM*EMEB:DET:NRR*C/EMEB:DET:NRR*D:DET:NRR *EIB:DSIR:RES:
____ ___------__--__-------____ -_-_-_-_-___:_ ------------ :------------:-------- :-
NAME :RJKiessel :JMain :TGScarbrough:JANorberg :JERichardson:OORothberg :
___
DATE :08/26/91 :------------:09/03/91 -:9/03/91 -:090/1 :09--1--------
DATE :08/26/91 :08/26/91 :09/03/91 :09/03/91 :09/03/91 :09/04/91 :
Document Name: IN 91-61
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list | - Information Notice 1991-01, Supplier of Misrepresented Resistors (4 January 1991, Topic: Fitness for Duty)
- Information Notice 1991-02, Brachytherapy Source Management (7 January 1991, Topic: Fitness for Duty, Brachytherapy)
- Information Notice 1991-03, Management of Wastes Contaminated with Radioactive Materials (Red Bag Waste & Ordinary Trash) (7 January 1991, Topic: Fitness for Duty, Brachytherapy)
- Information Notice 1991-04, Reactor Scram Following Control Rod Withdrawal Associated with Low Power Turbine Testing (28 January 1991, Topic: Fitness for Duty)
- Information Notice 1991-05, Intergranular Stress Corrosion Cracking in Pressurized Water Reactor Safety Injection Accumulator Nozzles (30 January 1991, Topic: Fitness for Duty, Hydrostatic, Liquid penetrant)
- Information Notice 1991-06, Lock-up of Emergency Diesel Generator and Load Sequencer Control Circuits Preventing Restart of Tripped Emergency Diesel Generator (31 January 1991, Topic: Fitness for Duty, Brachytherapy)
- Information Notice 1991-07, Maintenance Deficiency Associated with General Electric Horizontal Custom 8000 Induction Motors (4 February 1991, Topic: Fitness for Duty, Brachytherapy)
- Information Notice 1991-08, Medical Examinations for Licensed Operators (5 February 1991, Topic: Brachytherapy)
- Information Notice 1991-09, Counterfeiting of Crane Valves (25 September 2007)
- Information Notice 1991-10, Summary of Semiannual Program Performance Reports on Fithess-For-Duty (FFD) in the Nuclear Industry (12 February 1991)
- Information Notice 1991-12, Potential Loss of Net Positive Suction Head (NPSH) of Standby Liquid Control System Pumps (15 February 1991)
- Information Notice 1991-13, Inadequate Testing of Emergency Diesel Generators (Edgs) (4 March 1991)
- Information Notice 1991-13, Inadequate Testing of Emergency Diesel Generators (EDGs) (4 March 1991)
- Information Notice 1991-14, Recent Safety-Related Incidents at Large Irradiators (5 March 1991, Topic: Fitness for Duty, Coatings, Incorporated by reference, Brachytherapy, Uranium Hexafluoride)
- Information Notice 1991-15, Incorrect Configuration of Breaker Operating Springs in General Electric AK-Series Metal-Clad Circuit Breakers (6 March 1991)
- Information Notice 1991-16, Unmonitored Release Pathways from Slightly Contaminated Recycle and Recirculation Water Systems at a Fuel Facility (6 March 1991, Topic: Fitness for Duty, Brachytherapy)
- Information Notice 1991-17, Fire Safety of Temporary Installation or Services (11 March 1991)
- Information Notice 1991-18, High-Energy Piping Failures Caused by Wall Thinning (18 December 1991)
- Information Notice 1991-19, Steam Generator Feedwater Distribution Piping Damage (12 March 1991)
- Information Notice 1991-20, Electrical Wire Insulation Degradation Caused Failure in a Safety-Related Motor Control Center (19 March 1991)
- Information Notice 1991-21, Inadequate Quality Assurance Program of Vendor Supplying Safety-Related Equipment (19 March 1991)
- Information Notice 1991-22, Four Plant Outage Events Involving Loss of AC Power or Coolant Spills (19 March 1991)
- Information Notice 1991-23, Accidental Radiation Overexposures to Personnel Due to Industrial Radiography Accessory Equipment Malfunctions (26 March 1991, Topic: Fitness for Duty, Brachytherapy)
- Information Notice 1991-24, Recent Operating Experience Involving Reactor Operation Without a Licensed Reactor Operator or Senior Reactor Operator Present in the Control Room (26 March 1991)
- Information Notice 1991-25, Commercial-Grade Structural Framing Components Supplied As Nuclear Safety-Related Equipment (1 April 1991)
- Information Notice 1991-25, Commercial-Grade Structural Framing Components Supplied as Nuclear Safety-Related Equipment (1 April 1991)
- Information Notice 1991-26, Potential Nonconservative Errors in the Working Format Hansen-Roach Cross-Section Set Provided with Keno and Scale Codes (2 April 1991, Topic: Fitness for Duty, Brachytherapy)
- Information Notice 1991-27, Incorrect Rotation of Positive Displacement Pump (10 April 1991)
- Information Notice 1991-28, Cracking in Feedwater System Piping (15 April 1991)
- Information Notice 1991-29, Deficiencies Identifie During Electrical Distribution System Functional Inspections (15 April 1991)
- Information Notice 1991-30, Inadequate Calibration of Thermoluminescent Dosimeters Utilized to Monitor Extremity Dose at Uranium Processing and Fabrication Facilities (23 April 1991, Topic: Brachytherapy, Uranium Hexafluoride)
- Information Notice 1991-31, Nonconforming Magnaflux Magnetic Particle (14AM) Prepared Bath (9 May 1991)
- Information Notice 1991-32, Possible Flaws in Certain Piping Systems Fabricated by Associated Piping and Engineering (15 May 1991, Topic: Hot Short, Liquid penetrant)
- Information Notice 1991-33, Reactor Safety Information for States During Exercises and Emergencies (31 May 1991)
- Information Notice 1991-34, Potential Problems in Identifying Causes of Emergency Diesel Generator Malfunctions (3 June 1991)
- Information Notice 1991-35, Labeling Requirements for Transporting Multi-Hazard Radioactive Materials (7 June 1991)
- Information Notice 1991-36, Nuclear Plant Staff Working Hours (10 June 1991)
- Information Notice 1991-37, Compressed Gas Cylinder Missile Hazards (10 June 1991)
- Information Notice 1991-38, Thermal Stratification in Feedwater System Piping (13 June 1991, Topic: Unanalyzed Condition)
- Information Notice 1991-39, Compliance with 10 CFR Part 21, Reporting of Defects and Noncompliance. (17 June 1991)
- Information Notice 1991-40, Contamination of Nonradioactive System and Resulting Possibility for Unmonitored, Uncontrolled Release to the Environment (19 June 1991)
- Information Notice 1991-41, Potential Problems with the Use of Freeze Seals (27 June 1991)
- Information Notice 1991-42, Plant Outage Events Involving Poor Coordination Between Operations and Maintenance Personnel During Valve Testing and Manipulations (27 June 1991)
- Information Notice 1991-43, Recent Incidents Involving Rapid Increases in Primary-To-Secondary Leak Rate (5 July 1991, Topic: Grab sample)
- Information Notice 1991-45, Possible Malfunction of Westinghouse Ard, Bfd, & Nbfd Relays, & A200 DC & DPC 250 Magnetic Contactors (5 July 1991)
- Information Notice 1991-46, Degradation of Emergency Diesel Generator Fuel Oil Delivery Systems (18 July 1991)
- Information Notice 1991-47, Failure of Thermo-Lag Fire Barrier Material to Pass Fire Endurance Test (6 August 1991, Topic: Safe Shutdown, Fire Barrier)
- Information Notice 1991-48, False Certificates of Conformance Provided by Westinghouse Electric Supply Company for Refurbished Commercial-Grade Circuit Breakers (9 August 1991, Topic: Fire Barrier)
- Information Notice 1991-49, Enforcement of Safety Requirements for Radiographers (15 August 1991, Topic: High Radiation Area, Fire Barrier)
- Information Notice 1991-50, a Review of Water Hammer Events After 1985 (20 August 1991, Topic: Fire Barrier)
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