Diesel Engine Damage Caused by Hydraulic Lockup Resulting from Fluid Leakage Into CylindersML031190183 |
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-91-062, NUDOCS 9109240248 |
Download: ML031190183 (7) |
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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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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 91-62: DIESEL ENGINE DAMAGE CAUSED BY HYDRAULIC LOCKUP
RESULTING PROM FLUID'LEAKAGE INTO CYLINDERS
Addressees
All holders of operating licenses or construction permits for nuclear power
reactors.
Purpose
The U.S. Nuclear Regulatory Commissionj(NRC) is issuing this information notice
to alert addressees to the possibility of severe damage to the emergency diesel
generator (EDG) engine caused by hydraulic lockup resulting from fluid which
has leaked into cylinders of the diesel engine. It is-expected that recipients
will review the information for'applicability to their facilities and consider
actions, as appropriate, to avoid similar problems. However, suggestions
contained in this information notice are not NRC requirements; therefore, no.,..:
specific action or written response is required.
Description of Circumstances
On June 16, 1991, during a precautionary check in preparation for a routine
surveillance test of a Unit 2 emergency diesel generator (EDG), Southern
California Edison, the licensee at the San Onofre Nuclear Generating Station, found several pints of water in an engine cylinder. This precautionary check
allowed the licensee to avert severe engine damage. The licensee immediately
stopped the surveillance, declared the EDG inoperable, and initiated a work
order to determine the cause..'After removing the cylinder module, the licensee
found that a small leak path had slowly developed on the head gasket, allowing
the jacket 'cooling water to intrude.into the cylinder. The licensee had
operated this engine 7 days earlier without difficulty. Apparently, a suf-.
ficient amount of fluid had leaked after this previous test to partially fill
the cy-li.nder with water. The licensee determined that if the EDG had been
~9O2428ZA
IN 91-62 September 30, 1991 started on this occasion without first being checked for water in the cylin- ders, the EDG would have been severely damaged by hydraulic lockup of the
cylinder. While performing a similar precautionary check in 1987, the licensee
discovered a similar condition on a Unit 1 EDG that was caused by a cracked
cylinder. Furthermore, an EDG at the Palo Verde Nuclear Generating Station was
severely damaged in 1986 because it was started after water leaked into a
cylinder through a cracked cylinder wall.
Discussion
Because of the incompressible nature of water and fuel oil, the presence of
significant amounts of fluid in an engine cylinder can cause hydraulic lockup
during the compression stroke. When the force from the starter and other
firing cylinders tries to overcome this lockup, the engine could be severely
damaged. The fluid can come from a number of sources such as a leaking head
gasket, a cracked cylinder or head, or a defective fuel injector or lube oil
system. EDG vendors such as Transamerica Delaval, Incorporated (TDI
Instruction Manual, Volume 1, Model DSRV-20-4 Diesel Engine/Generator, page 4-2) and the General Motors Company, Electro-Motive Division (GM/EMD
Scheduled Maintenance Program, Stationary Power Units with Turbocharged
Engines, Maintenance Instruction 1728, Revision C, November 1977), have
recognized the significance of this hazard and have recommended that their
clients first check for fluid in the cylinders before starting the engine if
the-engine-has -been-shut-down-and-coo-led-for-aprolonged-periokd The- NRC
has discussed this problem with experienced diesel engine operators and
understands that this is also a common practice in non-nuclear industries.
To prepare the engine for each surveillance start, the operators at San Onofre
lock out the engine's automatic-start feature, open the indicator petcocks
(test valves) on all cylinders, and rotate the engine slowly to check for
fluid in the cylinders. After verifying the absence of fluid in the cylinders, the operators start the EDG. The NRC conducted an informal survey of resident
inspectors at plants of other NRC licensees and found that not all NRC
licensees are following this practice, possibly because the EDG becomes tempo- rarily inoperable while it is locked out with the cylinder petcocks open.
The NRC has also addressed this issue in its "Safety Evaluation Report Related
to the Operability and Reliability of Emergency Diesel Generators Manufactured
by Transamerica Delaval, Inc.," NUREG-1216, August 1986, beginning on page B-4, and in a contract study "Review of Resolution of Known Problems in Engine
Components for Transamerica Delaval Inc. Emergency Diesel Generators," PNL-5600,
December 1985, on page 4.160. These documents are available in the NRC Public
Document Room at 2120 L Street N.W., Washington, D.C. 20555.
IN 91-62 ^.
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.
Charles E. Rossi, Director
Division of Operational Even ssessment
Office of Nuclear Reactor Regulation
Technical contacts: Andrew Hon, RV
(714) 492-2641 Peter Prescott, NRR
(301) 492-1011 Vern Hodge, NRR
(301) 492-1861 Attachment: List of Recently Issued NRC Information Notices -
Attachsent
IN 91-62 Septeber 30, 1991 LIST OF RECEINTLY ISSUED
IlRt IFORIATION NOTICES.
Imforertion Date of
Rotice No. Subject Issuance Issued to
9141 Preliminary Results of 09/30/91 All holders of OLs or CPs
telidation Testing of for nuclear power reactors
Motor-O ated Valve and metor-operated valve
Diagnostic Equipment (NOV)diagnostic equiprent
vendors identified herein.
91-60 False Alarms of Alarm 09/24/91 All Nuclear Regulatory Com- Aat ters Because of mission (NRC licensees
Radiofrquency Inter- authorized to ase sealed
ference sources for Industrial
radioragphy.
91-59 Probles with Access 09/23/91 All holders of OLs or CPs
Authorization Progres 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
9147 Operational Exparience 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
91-65 Failures Causedby An 09/16/91 All holders of OLs or CPs
Improperly Adjusted Test for nuclear power reactors.
Link In 4.16 KYGeneral
Electric Switchgear
- 5-18 Failures of lndervoltage 09/10/91 All holders of OLsor CPsfor
Supp. I Output Circuit Boards In Westinghouse (i)-designed
the Mestinghouse4esigted nuclear power reactors.
Solid State Protection
Systse
914 Feresn Experience Regard- 09/06/91 All holders of OLsor CPs
Ing moron Dilution for pressurized water
reactors (PWRs).
DL
CF
IN 91-XX
S-eptember xx, 1991
_,Ege 2 of 2 Discussion
Because of the incompressible nature of water and fuel oil, the presence of
significant amounts of fluid in an engine cylinder can cause hydraulic lockup
during the compression stroke. When the force from the starter and other
firing cylinders tries to overcome this lockup, the engine could be severely
damaged. The fluid can come from a number of sources such as a leaking head
gasket, a cracked cylinder or head, or a defective fuel injector or lube oil
system. EDG vendors such as Transatnerica Delaval, Incorporated (TDI) and the
General Motors Company, Electro-Motive Division (GM/EMD), have recognized the
significance of this hazard and have recommended that their clients first check
for fluid in the cylinders before starting the engine if the engine has been
shut down and cooled for a prolonged period (8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or more). This is also a
common practice among EDG users in non-nuclear industries.
To prepare the engine for each surveillance start, the operators at San Onofre
lock out the engine's automatic-start feature, open the indicator petcocks
(test valves) on all cylinders, and rotate the engine slowly to check for
fluid in the cylinders. After verifying the absence of fluid in the cylinders, the operators start the EDG. The NRC conducted an informal survey of resident
inspectors at plants of other NRC licensees and found that not all NRC
licensees are following this practice, possibly because the EDG becomes tempo- rarily inoperable while it is locked out with the cylinder petcocks open.
The NRC has also addressed this issue in its "Safety Evaluation Report Related
to the Operability and Reliability of Emergency Diesel Generators Manufactured
by Transamerica Delaval, Inc.," NUREG-1216, August 1986, beginning on page B-4, and in a contract study "Review of Resolution of Known Problems in Engine
Components for Transamerica Delaval Inc. Emergency Diesel Generators,"
PNL-5600, December 1985, on page 4.160.
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: Andrew Hon, RV
(714) 492-2641 Peter Prescott, NRR
(301) 492-1011 Vern Hodge, NRR
(301) 492-1861 Attachment: List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES Document Name: INFO NOTICE - HON, HODGE
D/DOEA:NRR C/OGCB:DOEA:NRR*RPB:ADM D/DLPQ:NRR
CERossi CHBerlinger TechEd JWRoe
09/ /91 09/ /91 09/17/91 09/ /91
- OGCB:DOEA:NRR*RI/RV *SC/RV LPEB:DLPQ:NRR C/LPEB:DLPQ:NRR
CVHodge AHon PJohnson PPrescott4"O EWBrach
09/17/91 09/17/91 09/18/91 09/l'7/91 09/ /91
IN 91-XX
September xx, 1991 during the compression stroke. When the force from the starter and other
firing cylinders tries to overcome this lockup, the engine could be severely
damaged. The fluid can come from a number of sources such as a leaking head
gasket, a cracked cylinder or head, or a defective fuel injector or lube oil
system. EDG vendors such as Transamerica Delaval, Incorporated (TDI) and the
General Motors Company, Electro-Motive Division (GM/EMD), have recognized the
significance of this hazard and have recommended that their clients first check
for fluid in the cylinders before starting the engine if the engine has been
shut down and cooled for a prolonged period (8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or more). This is also a
common practice among EDG users in non-nuclear industries.
To prepare the engine for each surveillance start, the operator at San Onofre
locked the engine's automatic-start feature, opened the indicator petcocks
(test valves) on all cylinders, and rotated the engine slowly to check for
fluid in the cylinders. After verifying the absence of fluid in the cylinders, the operator started the EDG. The NRC conducted an informal survey of resident
inspectors at plants of other NRC licensees and found that not all NRC
licensees are following this practice, possibly because the EDG becomes tempo- rarily inoperable while it is locked with the cylinder petcocks open.
The NRC has also addressed this issue in its "Safety Evaluation Report Related
to the Operability and Reliability of Emergency Diesel Generators Manufactured
by Transamerica Delaval, Inc.," NUREG-1216, August 1986, beginning on page B-4, and in a contract study "Review of Resolution of Known Problems in Engine
Components for Transamerica Delaval Inc. Emergency Diesel Generators,"
PNL-5600, December 1985, on page 4.160.
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: Andrew Hon, RV
(714) 492-2641 Peter Prescott, NRR
(301) 492-1011 Vern Hodge, NRR
(301) 492-1861 Attachment: List of Recently Issued NRC Information Notices
Document Name: INFO NOTICE - HON, HODGE
D/DOEA:NRR C/OGCB:DOEA:NRR RPB:ADM D/DLPQ:NRR
CERossi CHBerlinger TechEd :1'fa;n97hAJWRoe
09/ /9 1 mJi 0 9 / /91 09 f9/91 09/ /91 OGCB:DOEA zRR RI/RV'R'V. , eSC/RV ?
'EftttfA EB:DLPQ:NRR C/LPEB:DLPQ:NRR
CVHodge i AHon 4 PJohnson A PPrescott EWBrach
09/tl/91 09//7/91 09/18/91 09/ /91 09/ /91
IN 91-62 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.
./,Aharles E. Rossi, d Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical contacts: Andrew Hon, RV
(714) 492-2641 Peter Prescott, NRR
(301) 492-1011 Vern Hodge, NRR
(301) 492-1861 Attachment: List of Recently Issued NRC Information Notices
D/dQR:t *C/OGCB:DOEA:NRR*RPB:ADM D/DLPQ:NRR
CERosifo CHBerlinger TechEd JWRoe
09 1 09/23/91 09/17/91 09/ /91
- OGCB:DOEA:NRR*RI V *SC/RV *LPEB:DLPQ:NRR C/LPEB:DLPQ:NRR
CVHodge AHon PJohnson PPrescott EWBrach
09/17/91 09/17/91 09/18/91 09/19/91 09/ /91 DOCUMENT NAME: IN 91-62
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: Andrew Hon, RV
(714) 492-2641 Peter Prescott, NRR
(301) 492-1011 Vern Hodge, NRR
(301) 492-1861 Attachment: List of Recently Issued NRC Information Notices
Document Name: INFO NOTICE - HON, HODGE
- SEE PREVIOUS CONCURRENCES ( 4I--
D/DOEA:NRR C/OGCB:DOEA:NRR*RPB:ADM D(;3SQ:.NRR lac
CERossi CHBerlinger TechEd JWRV)n
09/ /91 09/43/91 09/17/91
- OGCB:DOEA:NRR*RI/RV *SC/RV *LPEB:DLPQ:NRR C 4 /r LPQ:NRR
CVHodge AHon PJohnson PPrescott E9/i9
09/17/91 09/17/91 09/18/91 09/19/91
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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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