Failure of Packing Nuts on One-Inch Uranium Hexafluoride Cylinder ValvesML031180771 |
Person / Time |
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Site: |
Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant |
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Issue date: |
11/22/1989 |
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From: |
Cunningham R NRC/NMSS/IMNS |
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To: |
|
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References |
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IN-89-078, NUDOCS 8911160028 |
Download: ML031180771 (6) |
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Similar Documents at Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant |
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Category:NRC Information Notice
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Mclaughlin on NRC, Regarding NRC Information Notice 2006-13: Groundwater Contamination 2020-09-03 The following query condition could not be considered due to this wiki's restrictions on query size or depth: <code> [[:Beaver Valley]] OR [[:Millstone]] OR [[:Hatch]] OR [[:Monticello]] OR [[:Calvert Cliffs]] OR [[:Dresden]] OR [[:Davis Besse]] OR [[:Peach Bottom]] OR [[:Browns Ferry]] OR [[:Salem]] OR [[:Oconee]] OR [[:Nine Mile Point]] OR [[:Palisades]] OR [[:Palo Verde]] OR [[:Perry]] OR [[:Indian Point]] OR [[:Fermi]] OR [[:Kewaunee]] OR [[:Catawba]] OR [[:Harris]] OR [[:Wolf Creek]] OR [[:Saint Lucie]] OR [[:Point Beach]] OR [[:Oyster Creek]] OR [[:Watts Bar]] OR [[:Hope Creek]] OR [[:Grand Gulf]] OR [[:Cooper]] OR [[:Sequoyah]] OR [[:Byron]] OR [[:Pilgrim]] OR [[:Arkansas Nuclear]] OR [[:Three Mile Island]] OR [[:Braidwood]] OR [[:Susquehanna]] OR [[:Summer]] OR [[:Prairie Island]] OR [[:Columbia]] OR [[:Seabrook]] OR [[:Brunswick]] OR [[:Surry]] OR [[:Limerick]] OR [[:North Anna]] OR [[:Turkey Point]] OR [[:River Bend]] OR [[:Vermont Yankee]] OR [[:Crystal River]] OR [[:Haddam Neck]] OR [[:Ginna]] OR [[:Diablo Canyon]] OR [[:Callaway]] OR [[:Vogtle]] OR [[:Waterford]] OR [[:Duane Arnold]] OR [[:Farley]] OR [[:Robinson]] OR [[:Clinton]] OR [[:South Texas]] OR [[:San Onofre]] OR [[:Cook]] OR [[:Comanche Peak]] OR [[:Yankee Rowe]] OR [[:Maine Yankee]] OR [[:Quad Cities]] OR [[:Humboldt Bay]] OR [[:La Crosse]] OR [[:Big Rock Point]] OR [[:Rancho Seco]] OR [[:Zion]] OR [[:Midland]] OR [[:Bellefonte]] OR [[:Fort Calhoun]] OR [[:FitzPatrick]] OR [[:McGuire]] OR [[:LaSalle]] OR [[:05000000]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] </code>.
[Table view]The following query condition could not be considered due to this wiki's restrictions on query size or depth: <code> [[:Beaver Valley]] OR [[:Millstone]] OR [[:Hatch]] OR [[:Monticello]] OR [[:Calvert Cliffs]] OR [[:Dresden]] OR [[:Davis Besse]] OR [[:Peach Bottom]] OR [[:Browns Ferry]] OR [[:Salem]] OR [[:Oconee]] OR [[:Nine Mile Point]] OR [[:Palisades]] OR [[:Palo Verde]] OR [[:Perry]] OR [[:Indian Point]] OR [[:Fermi]] OR [[:Kewaunee]] OR [[:Catawba]] OR [[:Harris]] OR [[:Wolf Creek]] OR [[:Saint Lucie]] OR [[:Point Beach]] OR [[:Oyster Creek]] OR [[:Watts Bar]] OR [[:Hope Creek]] OR [[:Grand Gulf]] OR [[:Cooper]] OR [[:Sequoyah]] OR [[:Byron]] OR [[:Pilgrim]] OR [[:Arkansas Nuclear]] OR [[:Three Mile Island]] OR [[:Braidwood]] OR [[:Susquehanna]] OR [[:Summer]] OR [[:Prairie Island]] OR [[:Columbia]] OR [[:Seabrook]] OR [[:Brunswick]] OR [[:Surry]] OR [[:Limerick]] OR [[:North Anna]] OR [[:Turkey Point]] OR [[:River Bend]] OR [[:Vermont Yankee]] OR [[:Crystal River]] OR [[:Haddam Neck]] OR [[:Ginna]] OR [[:Diablo Canyon]] OR [[:Callaway]] OR [[:Vogtle]] OR [[:Waterford]] OR [[:Duane Arnold]] OR [[:Farley]] OR [[:Robinson]] OR [[:Clinton]] OR [[:South Texas]] OR [[:San Onofre]] OR [[:Cook]] OR [[:Comanche Peak]] OR [[:Yankee Rowe]] OR [[:Maine Yankee]] OR [[:Quad Cities]] OR [[:Humboldt Bay]] OR [[:La Crosse]] OR [[:Big Rock Point]] OR [[:Rancho Seco]] OR [[:Zion]] OR [[:Midland]] OR [[:Bellefonte]] OR [[:Fort Calhoun]] OR [[:FitzPatrick]] OR [[:McGuire]] OR [[:LaSalle]] OR [[:05000000]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] </code>. |
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR MATERIAL SAFETY AND SAFEGUARDS
WASHINGTON, D.C. 20555 November 22, 1989 NRC INFORMATION NOTICE NO. 89-78: FAILURE OF PACKING NUTS ON ONE-INCH
URANIUM HEXAFLUORIDE CYLINDER VALVES
Addressees
All U.S. Nuclear Regulatory Commission (NRC) licensees authorized to possess
and use source material and/or special nuclear material for the heating, emptying, filling, or shipping of uranium hexafluoride in 30- and 48-inch
diameter cylinders.
Purpose
This notice is provided to advise licensees about incidents in which packing
nuts on one-inch uranium hexafluoride cylinder valves were found to be cracked.
It is expected that recipients will review the information for applicability
to their activities, distribute it to responsible operations staff, and consider
actions, if appropriate, to identify and correct similar occurrences at their
facilities. However, suggestions contained in this Notice do not constitute any
new NRC requirements, and no written response is required.
Description of Circumstances
Allied-Signal, Inc., has reported that cracks were observed in packing nuts
on three one-inch valves designed for use in 30- and 48-inch diameter uranium
hexafluoride cylinders. The cracks were discovered when the valves were removed
from storage and visually inspected by the licensee. The affected valves were
unused and had been in storage since receipt in early 1987 from the French firm, Descote. Both the U.S. Department of Energy (DOE) and the Canadian Atomic
Energy Control Board have reported similar cracking in packing nuts on one-inch
valves supplied by Superior Valve Company. However, unlike the Descote valves, the Superior valves were in service at the time the cracks were observed.
Cracked nuts on uranium hexafluoride cylinder valves can result in leakage of
uranium hexafluoride through the packing material and valve stem.
DOE's contractor, Martin Marietta Energy Systems, Inc. (MMES), examined one
of the affected Descote valves to determine possible causes of the cracking.
Its investigation found that the failure mode of the packing nut was inter- granular cracking. The metallographic structure of the examined nut was
different from Descote and Superior nuts produced from other bar stock.
89111
-r
IN 89-78 November 22, 1989 The cracked packing nuts were produced from material designated heat lot R91.
The MMES investigation also indicated that the nut had significant residual
stresses, possibly resulting from surface finishing operations. These findings
suggest that the packing nuts produced from heat lot R91 and/or subjected to
surface grinding are susceptible to stress corrosion cracking.
Descote has also investigated the cracking problem and concluded that the
cracking is the combined result of the following:
1. Excessive stresses placed on the nut by cold flow and thermal expansion
of the teflon packing rings, resulting from retightening of the nut and
repeated heating of the valve;
2. Mechanical and structural characteristics of the packing nut material are
incompatible with these stresses; and
3. The presence of uranium hexafluoride, hydrofluoric acid, and nascent
hydrogen facilitates cracking.
Based on its findings and those of MMES, Descote has recalled all one-inch
valve packing nuts produced from heat lot R91.
Discussion:
The American National Standards Institute (ANSI) provides criteria or packaging
of uranium hexafluoride for transport. The criteria are found in ANSI
N14.1-1987, NUranium Hexafluoride-Packaging for Transport." This standard
provides, in part, specific information on design, fabrication, and assembly
requirements for the one-inch valve installed in uranium hexafluoride cylinders.
The standard states that the valve packing nut is initially to be torqued in
the range of 120 to 150 foot-pounds, to compact the teflon packing rings. If
leakage at the valve stem occurs, the packing nut may be retightened. However, excessive force is not to be used in an attempt to eliminate the leak. The
maximum torque permitted by the standard for retightening the packing nut is
150 foot-pounds.
Although NRC does not consider the cracked packing nut to be a major safety
issue, licensees should consider actions to identify and reduce the occurrence
of cracking. Licensees should review their retightening procedures to ensure
that operators are not misapplying the ANSI torquing requirement by retightening
packing nuts to the maximum torque with each valve use. Furthermore, since
packing nuts are more likely to crack while in service, licensees should have
operators check for cracked packing nuts before and after each valve use.
I .
IN 89-78 November 22, 1989 No written response is required by this information notice. If you have any
questions about this matter, please direct them to the technical contacts
listed below or to the appropriate NRC regional office.
chard E. Cunningm, Directo /
ivision of Industrial and
Medical Nuclear Safety
Technical Contacts: i. Scott Pennington, HMSS
(301) 492-0693 George H. Bidinger, 1MSS
(301) 492-0683 Attachments:
1. List of Recently Issued NMSS Information Notices
2. List of Recently Issued NRC Information Notices
Attachmnt I Attacument 2 November 22. 1883 "wooer 2t. 198 Page1sof I PeA"1 of I
LIST OFRtCCEXIL ISSUED LIST OFRECZn LT ISSUED
M"SS IFOMION NOTICES IIFOIUATION NOTICES
KRC
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Notice Na. Subject Issuance Issued to Noice Nto. t&4-
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8,n Debris IN donteirmeet 1/1n/3 All holders of OLs
8340 Naintance of Toletherapy D1/."U Al U.S. NRC redical Emergency Sums a" or CPsfor Pis.
UnitU Telotherepy Licanseei. Incorrect Screr
Coaflgerations
5.7 Potential Problems Vith DUA1/1/ All heldera of operating
Iorn or Distorted Me licenses or construction 8iofouling Ageet: zebra 11/21/83 All holders of OLs
permits for nuclear poawr fluseel or Cps for nucler
Clas On Self-contained
Branching Apparatus reactors and fuel power roeteors.
facilities. 8N-75 Falsificetion of Melder 11/23/89 All holders of DLs
05111/8 All holders of licenses Qualifications for or CPs for nuclear
8U4 Confidentiality of
Contractor Eeployprn Poser reactors.
Exercise Saereos for fuel cycle facilities
sad byproduct materiel
licensees hewing en 83-74 Clarificetitn of Trans- l1n1a/ All masufecturers
epprovd emrgancy portation Rtquiremnts and distributors of
response plea. Applicable to ltura eof radiophereeciuticels
Spent Radiophemacy Dossges for medicel use.
? ProposedAsX nts to 40 04/04/E9 All U.S. I licensees. from Users to Suppliers nuclear phrmacies, an mdicel licensees.
FR Port 1. Air Emission
StandardS for Radionuclides
8-73 Potential Overpresserization 11/I/89 All holders of OLs
1 Loss V Theft of Unsecured 03/30/ All U.S. lOdbyproduct. of Los Pressure System or CPs for nuclear
Licenses Noatrial aource and swcil ponr ractors.
nuclear material licensees
L93 Dsoslo AbritiM 8-.72 failure of Licensed Senior 10/2t/89 All holders of OLs
Q3/3V/S All holders of U.S. NRC Operators to Classify or Crs for nmcleer
specific licenses Einrgency Events Properly poser reactors.
authorising well-loning
activities. "-71 Diversion of the Residual 10/13/83 All holders of OLs
Het RemoI PumpSeal or CPs for nuclear
03/07/5 All NCsource, byproduct. cooling Water Flow Ouring poser reactors.
Unauthorized Transfer of
Ownership or Control of ad spWetel macleer Recirculation Operation
Licensed Activities material licensees. Followin a Loss-of- Coolnt Acoident
lcler
Nu24 Criticality Safely 03/04/33 All full qcle licensees
uadother 1icensnes 89f Possible Indicetions of 10/11/8I All holders of O.s
possssing mre then isreprasnted dr or Ctr for macleer
Products pver reactors.
aitiel miss quantities
of special necleer mitorsi
Loss of Thermal Rurli 9/23/83 All holders Of OLS
Caused kb Channel Bon or Cps for BYRS.
am
0
CU* Const n Pexuit
UNITED STATES FIRT LAS AI
POSTAGE As FEES PAID
NUCLEAR REGULATORY COMMISSION USSNRC
WASHINGTON, D.C. 20555 OFFICIAL BUSINESS
PENALTY FOR PRIVATE USE, $300
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR MATERIAL SAFETY AND SAFEGUARDS
WASHINGTON, DC 20555 NOVEMBER , 1989 NRC INFORMATION NOTICE NO. 89- : FAILURE OF PACKING NUTS ON ONE-INCH
URANIUM HEXAFLUORIDE CYLINDER VALVES
Addressees
All U. S. Nuclear Regulatory Commission (NRC) licensees authorized to possess
and use source material and/or special nuclear material for the heating, emptying, filling, or shipping of uranium hexafluoride in 30- and 48-inch
diameter cylinders.
Purpose
This Notice is provided to advise licensees about incidents in which packing
nuts on one-inch uranium hexafluoride cylinder valves were found to be cracked.
It is expected that recipients will review the information for applicability to
their activities, distribute it to responsible operations staff, and consider
actions, if appropriate, to identify and correct similar occurrences at their
facilities. However, suggestions contained in this Notice do not constitute any
new NRC requirements, and no written response is required.
Description of Circumstances
Allied-Signal, Inc., has reported that cracks were observed in packing nuts on
three one-inch valves designed for use in 30- and 48-inch diameter uranium
hexafluoride cylinders. The cracks were discovered when the valves were removed
from storage and visually inspected by the licensee. The affected valves were
unused and had been in storage since receipt in early 1987 from the French firm, Descote. Both the U.S. Department of Energy (DOE) and the Canadian Atomic
Energy Control Board have reported similar cracking in packing nuts on one-inch
valves supplied by Superior Valve Company. However, unlike the Descote valves, the Superior valves were in service at the time the cracks were observed.
Cracked nuts on uranium hexafluoride cylinder valves can result in leakage of
uranium hexafluoride through the packing material and valve stem.
DOE's contractor, Martin Marietta Energy Systems, Inc. (MMES), examined one of
the affected Descote valves to determine possible causes of the cracking.
Its investigation found that the failure mode of the packing nut was intergranular
cracking. The metallographic structure of the examined nut was different
from Descote and Superior nuts produced from other bar stock. The cracked
IN 89- November , 1989 No written response is required by this Information Notice. If you have any
questions about this matter, please direct them to the technical contacts listed
below or to the appropriate NRC Regional Office.
Richard E. Cunningham, Director
Division of Industrial and
Medical Nuclear Safety
Technical Contacts: W. Scott Pennington, NMSS
(301) 492-0693 George H. Bidinger, NMSS
(301) 492-0683 Attachments:
1. List of Recently Issued
NMSS Information Notices
2. List of Recently Issued
NRC Information Notices
Editor &
EKraus: 11/9 /89 OFC:IMUF: IMUF IMUF: X
WI --------------- 6->--------- IA-------
NAME:WSPennington:mh: VL harpe: GHBidinger: LCRouse:
DATE:11/14/89: 11/v7/89: 11/):/89: 11/)
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list | - Information Notice 1989-01, Valve Body Erosion (4 January 1989)
- Information Notice 1989-02, Criminal Prosecution of Licensee'S Former President for Intentional Safety Violations (9 January 1989)
- Information Notice 1989-03, Potential Electrical Equipment Problems (11 January 1989)
- Information Notice 1989-04, Potential Problems from the Use of Space Heaters (17 January 1989)
- Information Notice 1989-05, Use of Deadly Force by Guards Protecting Nuclear Power Reactors Against Radiological Sabotage (19 January 1989)
- Information Notice 1989-06, Bent Anchor Bolts in Boiling Water Reactor Torus Supports (24 January 1989)
- Information Notice 1989-07, Failures of Small-Diameter Tubing in Control Air, Fuel Oil & Lube Oil Systems Render Emergency Diesel Generators Inoperable (25 January 1989)
- Information Notice 1989-08, Pump Damage Caused by Low-Flow Operation (26 January 1989)
- Information Notice 1989-09, Credit for Control Rods Without Scram Capability in the Calculation of Shutdown Margin (26 January 1989, Topic: Shutdown Margin)
- Information Notice 1989-10, Undetected Installation Errors in Main Steam Line Pipe Tunnel Differential Temperature-Sensing Elements at Boiling Water Reactors (27 January 1989)
- Information Notice 1989-11, Failure of DC Motor-Operated Valves to Develop Rated Torque Because of Improper Cable Sizing (2 February 1989, Topic: Shutdown Margin)
- Information Notice 1989-12, Dose Calibrator Quality Control (9 February 1989)
- Information Notice 1989-13, Alternative Waste Management Procedures in Case of Denial of Access to Low-Level Waste Disposal Sites (8 February 1989, Topic: Shutdown Margin, Authorized possession limits)
- Information Notice 1989-15, Second Reactor Coolant Pump Shaft Failure at Crystal River (16 February 1989, Topic: Shutdown Margin)
- Information Notice 1989-16, Excessive Voltage Drop in DC Systems (16 February 1989, Topic: Shutdown Margin, Battery sizing)
- Information Notice 1989-17, Contamination and Degradation of Safety-Related Battery Cells (22 February 1989)
- Information Notice 1989-18, Criminal Prosecution of Wrongdoing Committed by Suppliers of Nuclear Products or Services (24 August 1990)
- Information Notice 1989-20, Weld Failures in a Pump of Byron-Jackson Design (24 February 1989, Topic: Health Physics Network)
- Information Notice 1989-21, Changes in Performance Characteristics of Molded-Case Circuit Breakers (27 February 1989, Topic: Health Physics Network)
- Information Notice 1989-23, Environmental Qualification of Litton-Veam Cir Series Electrical Connectors (3 March 1989, Topic: Health Physics Network)
- Information Notice 1989-24, Nuclear Criticality Safety (6 March 1989, Topic: Health Physics Network)
- Information Notice 1989-25, Unauthorized Transfer of Ownership or Control of Licensed Activities (7 March 1989, Topic: Health Physics Network)
- Information Notice 1989-26, Instrument Air Supply to Safety-Related Equipment (7 March 1989, Topic: Health Physics Network)
- Information Notice 1989-27, Limitations on the Use of Waste Forms and High Integrity Containers for the Disposal of Low-Level Radioactive Waste (8 March 1989, Topic: Process Control Program)
- Information Notice 1989-28, Weight and Center of Gravity Discrepancies for Copes-Vulcan Air-Operated Valves (14 March 1989)
- Information Notice 1989-29, Potential Failure of Asea Brown Boveri Circuit Breakers During Seismic Event (15 March 1989)
- Information Notice 1989-30, High Temperature Environments at Nuclear Power Plants (1 November 1990)
- Information Notice 1989-31, Swelling and Cracking of Hafnium Control Rods (22 March 1989)
- Information Notice 1989-32, Surveillance Testing of Low-Temperature Overpressure-Protection Systems (23 March 1989, Topic: Stroke time)
- Information Notice 1989-33, Potential Failure of Westinghouse Steam Generator Tube Mechanical Plugs (23 March 1989)
- Information Notice 1989-34, Disposal of Americium Well-Logging Sources (30 March 1989)
- Information Notice 1989-35, Loss & Theft of Unsecured Licensed Material, Attachment 1 to NRC Information Notice 1990-014: Accidental Disposal of Radioactive Materials. (Also includes Attachments 2 & 3) (30 March 1989)
- Information Notice 1989-35, Loss & Theft of Unsecured Licensed Material, Attachment 1 to NRC Information Notice 1990-014: Accidental Disposal of Radioactive Materials. (Also Includes Attachments 2 & 3) (30 March 1989, Topic: Moisture-Density Gauge)
- Information Notice 1989-36, Excessive Temperatures in Emergency Core Cooling System Piping Located Outside Containment (4 April 1989)
- Information Notice 1989-37, Proposed Amendments to 40 CFR Part 61, Air Emission Standards for Radionuclides (4 April 1989)
- Information Notice 1989-38, Atmospheric Dump Valve Failures at Palo Verde Units 1, 2, and 3 (5 April 1989, Topic: Emergency Lighting)
- Information Notice 1989-39, List of Parties Excluded from Federal Procurement or Non-Procurement Programs (5 April 1989)
- Information Notice 1989-40, Unsatisfactory Operator Test Results and Their Effect on the Requalification Program (14 April 1989)
- Information Notice 1989-41, Operator Response to Pressurization of Low-Pressure Interfacing Systems (20 April 1989)
- Information Notice 1989-42, Failure of Rosemount Models 1153 and 1154 Transmitters (21 April 1989)
- Information Notice 1989-43, Permanent Deformation of Torque Switch Helical Springs in Limitorque SMA-Type Motor Operators (1 May 1989)
- Information Notice 1989-44, Hydrogen Storage on the Roof of the Control Room (27 April 1989, Topic: Coatings)
- Information Notice 1989-45, Metalclad, Low-Voltage Power Circuit Breakers Refurbished with Substandard Parts (8 May 1989, Topic: Commercial Grade Dedication, Coatings)
- Information Notice 1989-46, Confidentiality of Exercise Scenarios (11 May 1989, Topic: Coatings)
- Information Notice 1989-47, Potential Problems with Worn or Distorted Hose Clamps on Self-Contained Breathing Apparatus (18 May 1989, Topic: Coatings)
- Information Notice 1989-48, Design Deficiency in the Turbine-Driven Auxiliary Feedwater Pump Cooling Water Systems (22 May 1989, Topic: Coatings, Temporary Modification)
- Information Notice 1989-49, Failure to Close Service Water Cross-Connect Isolation Valves (22 May 1989, Topic: Coatings)
- Information Notice 1989-50, Inadequate Emergency Diesel Generator Fuel Supply (30 May 1989)
- Information Notice 1989-51, Potential Loss of Required Shutdown Margin During Refueling Operations (31 May 1989, Topic: Shutdown Margin, Coatings)
- Information Notice 1989-52, Potential Fire Damper Operational Problems (8 June 1989, Topic: Safe Shutdown, Shutdown Margin, Fire Barrier, Fire Protection Program)
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