Site Area Emergency Resulting from a Loss of Non-Class 1E Uninterruptible Power SuppliesML031190491 |
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: |
10/09/1991 |
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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-91-064, NUDOCS 9110030270 |
Download: ML031190491 (10) |
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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 STATES
NUCLEAR REGULATORY-COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555 October 9, 1991 NRC INFORMATION NOTICE 91-64: SITE AREA EMERGENCY RESULTING FROM A LOSS OF
NON-CLASS 1E UNINTERRUPTIBLE POWER SUPPLIES
Addressees
nuclear power
All holders of operating licenses or construction permits for
reactors.
Purpose
information notice
The U.S. Nuclear Regulatory Commission (NRC) is issuing this failure of
to alert addressees to problems resulting from the common mode
nonsafety-related applications at Unit 2 uninterruptible power supplies used in recipients will
of the Nine Mile Point Nuclear Station. It is expected that
to their facilities and consider
review the information for applicability suggestions
actions, as appropriate, to avoid similar problems. However, therefore, no
contained in this information notice are not NRC requirements;
specific action or written response is required.
Description of Circumstances
On August 13, 1991, Nine Mile Point.Unit 2 was operating caused at full power when a
main transformer which the generator, fault occurred on phase B of the automatically
turbine, and reactor to trip. Station loads were transferred
power from the
from the normal station service transformer, which receives power from the
generator, to the reserve station transformer, which-receives
voltage on the
grid. During the transient which lasted for about 12 cycles, of normal value
station's phase B buses decreased to approximately .50 percent
before returning to normal.
five of eight
The voltage transient resulted in loss of the power output from power supplies
nonsafety-related uninterruptible power supplies. 'Loss of these control rod posi- caused the loss of control room annunciators,.indication of the safety
tions, the core thermal limits computer, the process computer, some instru- parameter display system computer, the feedwater control system, the plant
mentation for balance-of-plant systems, some instrument recorders, Some of the
the plant.
radio and paging systems, and some of the lighting forFor.example, the average
instrument recorders that were lost failed "as is."
tripped.
power range monitors continued to indicate 100% after the reactor average power
Nevertheless, control room operators were able to verify from panels'and from other
range meters and local power range lights mounted on back down...
indications that the reactor actually had tripped and.was shut
2A.
9110030
IN91-64 October 9, 1991 Because of the loss of control room annunciators
resulting from automatic tripping of the generator, and the reactor transient
Niagara Mohawk Power Corporation (the licensee) turbine, and reactor, in conformance with the emergency plan. The declared a site area emergency
accordance with emergency operating procedures. operators shut down the plant in
trip, plant personnel had restored power output Thirty-four minutes after the
uninterruptible power supplies using the alternate from the five nonsafety-related
Thirteen hours after the trip, the reactor maintenance power sources.
was
and an hour later, the licensee ended the site in the cold shutdown condition, area emergency.
As shown in Attachment 1, each uninterruptible
3-phase 600-Vac power from the plant's electrical power supply cabinet receives
system is connected to either the generator distribution system. This
the 600-Vac input power passes through an or the grid. Inside the cabinet, ac-to-dc
mately 140-Vdc power which then passes through converter to obtain approxi-
3-phase 2 08/120-Vac power that is within specified an inverter to generate quality
tude, frequency, and phase. The output from limits for voltage ampli- critical loads, many of which are sensitive the cabinet is distributed to
are sometimes present with normal ac power. to the voltage irregularities that
power to these loads when the normal supply To prevent the interruption of
is connected to the uninterruptible power of power is lost, a 125-Vdc battery
and the dc-to-ac inverter. supply between the ac-to-dc converter
The uninterruptible power supply cabinet also
208/120-Vac maintenance power. This power receives three-phase
regulator and is used to supply critical loadsis provided through a voltage
ruptible power from the inverter is not available. when the supply of uninter- control logic system selects either inverter Within the cabinet, a
tion to the critical loads. or maintenance power for distribu- Prior to and at the time of the event, the
received power from phase B of the maintenancecontrol logic power supply normally
power was not available, the input for the power source. If maintenance
control
cally transferred to the output of the inverter. logic power supply automati- the control logic tripped the uninterruptible However, on August 13, 1991, transient on phase B of the maintenance power power supply in response to the
expected that the control logic power supply source. The licensee had
the inverter and, when inplant electrical would transfer to the output of
distribution system voltages returned
to normal, would transfer back to the maintenance
the uninterruptible power supply would have source. Had this happened, loads. continued'to supply the critical
If the control logic power supply had
from the inverter and backup power frombeen wired to receive its normal power
the maintenance source, the control
logic would have had a continuous source
of power and the loss of power output
from the uninterruptible power supplies would
not have occurred. The control
logic power supplies for the three nonsafety-related
uninterruptible power supplies that were and the two safety-related
receive dc power for control logic through not lost during the event normally
a dc-to-dc converter.
IN 91-64 October 9, 1991 e 5Page te
3 of 4 rechargeable lead-acid cells
Six battery packs, each consisting of 3 small the control logic and
ith nInterruptible.Rower.kupply, provide power to
&itfi'io t~ir pio vowerrfs2Isaqisl'bW1 *If the.ibattery packs
Wen~fdr
i
n .1 tfb i
1A rtWIt46Glid hWteprbVided sufficient
NeltdJ &fiebei~rsiti df the
td:h&Viepreveivtedilos
e to hfeoltccnSeerfoundithatsthe
uninterruptible power supplies. After thi9Evhtt
electrolyte in the lead-acid cells was dry.
in the vendor's manual does not
Although the prev nt ve zintenahcg:section
address the bdittNe 0 aSotb Pecti bn of the manual states that theypacks
had installed the battery
stiyl be rb la 4 Si* ry r4i rg .2Tbvendor 2 rtie licensee determined that the battery
z03 r
pac k1s9gb6iI2 9 e' e d q because of the environmental condi- tions within the cabinets.
The licensee obtained the unintaiript~ bEt.iber ideas es:ffomEx-de-slettronics
obtained)-a" eieV-- Wn'ual for the
in 1981. In 1985, the licensee which recognized the
uninterruptible power supplies from Exide Electronics power for the
importance of reversing the connectios o$foWatTWndbackupElectronics did have
control logic power supplies. New unitsb~pl-dtk(,Exide did not specifically
the connections reversed. However, Exide Electronics had obtained the
advise the licensee of this change. The licensee :>-t;mti1A
uninterruptible power supplies as commercial grade products.
Ot'-' miDIG 5 98 xrqqu2 9 , i- i4J .1 f 4Mb p'WdI' zuppliesttOlpravide normal
The licensee has modifi logic power supplies from the output of the inverter
input power to the control The licensee has also
and alternate power from the maintenance source. and has established an annual
logic
replaced the battery packs for the control to evaluate the performance of the
replacement schedule. The licensee intends
to the control logic under
switching circuitry for supplying input power changes to the vendor's manual.
various conditions and to process appropriate
Discussion
turbine, and reactor trips. The
The transformer fault caused the generator, of voltage on the plant's
transformer fault also led to a momentary degradation the common mode failure of the
electrical distribution system and, in turn, of the loss of control rod
five uninterruptible power supplies. Because power supplies, the
position indicators due to loss of the uninterruptibleall control rods had fully inserted
operators could not Immediately verify that difficulty in implementing the
into the reactor core. This resulted in some
was in a safe condition at all
emergency procedures. However, the reactorall safety parameters, except for
times, and operators were able to monitor The two safety-related uninter- control rod positions, throughout the event. a design basis accident occurred in
ruptible power supplies were not lost. Had been available for the instrumen- conjunction with this event, power would have safety systems.
tation and control components in the required
IN 91-64 October 9, 1991 This information notice requires no specific action or writtin 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.
ars E. Rossi, 1rector- Division of Operational Eve ts Agssssment
Office of Nuclear.Reactor Regulation
Technical contacts: Jack E. Rosenthal, AEOD
(301) 492-4440
Roger Woodruff, NRR.
(301) 49Z-1152 Attachments:
1. Unlnterruptible Power Supply Before Design Change
2. List of Recently Issued NRC Information Notices
I
=-- 125-VDC
BATTERY
(i, (D 0 AD 0
. o&s v-,.T amO
UN INTERRUPTIBLE POWER SUPPLY BEFORE DESIGN CHANGE
-A
to
o?
Attachment 2 IN 91-64 October 9, 1991 LIST OF RECENTLY ISSUED
NRC INFORMATION NOTICES
Information Date of
Notice No. Subject Issuance Issued to
91-63 Natural Gas Hazards 10/03/91 All holders of OLs or CPs
at Fort St. Vrain for nuclear power reactors
Nuclear Generating Station
91-62 Diesel Engine Damage 09/30/91 All holders of OLs or CPs
Caused by Hydraulic for nuclear power reactors
Lockup Resulting from
Fluid Leakage Into
Cylinders
91-61 Preliminary Results of 09/30/91 All holders of OLs or CPs
Validation Testing of for nuclear power reactors
Motor-Operated Valve and motor-operated valve
Diagnostic Equipment (MOV) diagnostic equipment
vendors identified herein.
91-60 False Alarms of Alarm 09/24/91 All Nuclear Regulatory Comi
Ratemeters Because of mission (NRC) licensees
Radiofrequency Inter- authorized to use sealed
ference sources for industrial
radiography.
91-59 Problems with Access 09/23/91 All holders of OLs or CPs
Authorization Programs for nuclear power reactors.
91-58 Dependency of Offset 09/20/91 All holders of OLs or CPs
Disc Butterfly Valve's for nuclear power reactors.
Operation on Orientation
with Respect to Flow
91-57 Operational Experience 09/19/91 All holders of OLs or CPs
on Bus Transfers for nuclear power reactors.
91-56 Potential Radioactive 09/19/91 All holders of OLs or CPs
Leakage to Tank Vented for nuclear power reactors.
to Atmosphere
OL = Operating License
CP = Construction Permit
IN 91-64 October 9, 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: Jack E. Rosenthal, AEOD
(301) 492-4440
Roger Woodruff, NRR
(301) 492-1152 Attachments:
1. Uninterruptible Power Supply Before Design Change
2. List of Recently Issued NRC Information Notices
Document Name: IN 91-64
- SEE PREVIOUS CONCURRENCES:
- OEAB *ADM/RPB *SC:OEAB *BC:OEAB *TL:IIT *PM:PD11 RWWoodruff JOMain RLDennig AEChaffee JERosenthal DSBrinkman
9/12/91 9/12/91 9/17/91 9/17/91 9/24/91 9/25/91
SNewberry
CHBerlinger
0I
Ro \W
9/25/91 9/27/91
IN 91-XX
September xx, 1991 condition at all times, and operators were able to monitor all safety
parameters, except for control roa positions, throughout the event. The two
safety-related uninterruptible power supplies were not lost. Had a loss of
coolant accident occurred in conjunction with this event, power would have
been available for the instrumentation and control components in the
emergency core cooling system.
This information notice requires no specific action or written response. If
you have any questionrabout the information in this notice, please contact Y'
one of the cal conta low or the appropria project manager .
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical ntact5 Jack E. Rosenthal, AEOD
(301) 492-4440
I1 Roger Woodruff, NRR
(301) 492-1152 Attachments:
1. Uninterruptible Power Supply Before Design Change
2. List of Recently Issued Information Notices sy_
K#
CONCURRENCE:
- OEAB *ADM/RPB *SC0OEAB *BC: OEAB
RWWoodruff JDrain RLDennig AE~haffee IT I DSB9rn9
9/12/91 9/12/91 9/17/91 9/17/91 9?IAA791 9/ S791 B: OCEC 4ID: DOEA
CHBerlinger CERossi
9gt51 91-1191 9/ /91
- SEE PREVIOUS CONCURRENCES
IN 91-XX
September xx, 1991 lighting. However, the two safety-related uninterruptible power supplies
were not lost. Had a loss of coolant accident occurred in conjunction with
this event, power would have been available for the instrumentation and
control components in the emergency core cooling system.
This information notice requires no specific action or written response. If
you have any question about the information in this notice, please contact
one of the technical contacts listed below or the appropriate project manager
in the Office of Nuclear Reactor Regulation.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Jack E. Rosenthal, AEOD
(301) 492-4440
Roger Woodruff, NRR
(301) 492-1152 Attachments:
1. Uninterruptible Power Supply Before Design Change
2. List of Recently Issued Information Notices
CONCURECE:
- OEAB *ADM/RfB TL: IIT PM:PD11 RWWoodruff JI)Main
9
&6ig
91 AIEChaffee JERosenthal DSBrinkman
9/12/91 9/12/91 /r1/ 9/I1/91 9/ /91 9/ /91 BC:SICB BC:OGCB D:DOEA
SNewberry CHBerlinger CERossi
9/ /91 9/ /91 9/ /91
- SEE PREVIOUS CONCURRENCES
a
IN 91-XX
September xx, 1991 one of the technical contacts listed below or the appropriate project manager
in the Office of Nuclear Reactor Regulation.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Jack E. Rosenthal, AEOD
(301) 492-4440
Roger Woodruff, NRR
(301) 492-1152 Attachment:
1. List of Recently Issued Information Notices
CONCURRECE:
OEAB thWS TECH EDITOR SC: OEAB BC:OEAB TL: IT FM:PD11 RWWoodruff ?fla;i £9A RLDennig AEChaffee JERosenthal DSBrinkman
9/q,/91 9/11/91 9/ /91 9/ /91 9/ /91 9/ /91 BC:OGCB D:DOEA
CHBerlinger CERossi
9/ /91 9/ /91
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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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