Sources of Unexpected Occupational Radiation Exposures at Spent Fuel Storage PoolsML031210552 |
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: |
05/09/1990 |
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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-90-033, NUDOCS 9005030120 |
Download: ML031210552 (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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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>. |
I/
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555 May 9, 1990
NRC INFORMATION NOTICE NO. 90-33: SOURCES OF UNEXPECTED OCCUPATIONAL RADIATION
EXPOSURES AT SPENT FUEL STORAGE POOLS
Addressees
All holders of operating licenses or construction permits for nuclear power
reactors.
Purpose
This information notice is intended to alert addressees to potential sources of
unexpected occupational radiation exposures at spent fuel storage (SFS) pools.
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 do not
constitute NRC requirements; therefore, no specific action or written response
is required.
Description of Circumstances
SFS pools provide a water-shielded location for the storage of spent fuel and
other highly radioactive materials that are potential sources of high radiation
exposures. SFS pools also may be contaminated with highly radioactive particles
having activities of tens of millicuries (mCi) or more. This information notice
identifies a number of events in which sources of unexpected occupational radi- ation exposures were encountered in the activities associated with SFS pools.
Events.Involving-Highly.Radioactive-Objects-That Floated ip SFS-Paols
In June 1989, several individuals involved in SFS pool cleanup activities at
the James A. FitzPatrick Nuclear Power Plant received unexpected radiation
exposures (within NRC limits) from an object floating near the surface of
the SFS pool near their work location. Subsequent radiation surveys of the
object indicated contact radiation exposure rates of about 1000 roentgens per
hour (R/hour). The licensee believes that the source of the radiation was a
small fragment of radioactive material imbedded in a piece of floating material.
The floating material probably was a piece of a 5-gallon polyethylene container
in which irradiated components had been stored underwater for more than a year.
Apparently, the polyethylene container began to disintegrate as a result of
radiation from the irradiated components stored inside it.
The problem of contaminated objects floating to the surface of SFS pools is
not new. In December 1984, complete canister filters from a portable under- water vacuuming system floated at least 15 feet toward the top of the spent
9005030120
IN 90-33 May 9, 1990 fuel racks at the Peach Bottom Atomic Power Station. Licensee personnel specu- lated that the filters may have surfaced and then sank to the spent fuel storage
racks. Although no personnel received unexpected exposures, this event could
have caused significant exposure to personnel.
In May 1987, floating vacuum cleaner filters were also involved in a similar
event at the Millstone Nuclear Power Station, Unit 1. During that event, the
radiation level on the refueling floor increased momentarily to more than 100
mR/hour, then quickly returned to a normal level of about 10 mR/hour. The high
radiation level occurred at the same time that the spent fuel pool cooling system
was returned to use following valve maintenance. Refilling of the system forced
air into the SFS pool through the sparger. The bubbles rose in the pool, causing
agitation. The licensee postulated that the agitation forced highly contaminated
vacuum cleaner filter cartridges stored in the pool to the surface. These filters
contained debris from past cleaning evolutions of the reactor vessel and were
suspended by nylon line in the SFS pool. After this event, the licensee decided
to remove disposable items from the pool and to replace nylon lines, used for
suspending items in the pool, with wire cables.
Events.Involving .Highly .Radioactive-Particles-or.Fragments-of Radioactive
Material Removed from. SVS.ools
During reracking operations in the SFS pool at the Diablo Canyon Nuclear Power
Plant, Unit 1, in December 1987, a highly radioactive particle (45.5 mCi of Co-60)
was inadvertently removed from the SFS pool. The particle was attached to an air
grinder hose that was partially pulled from the pool by the diver tender when the
grinder hose became entangled with the diver's hose. When the Co-60 particle was
removed from the pool, the radiation from the particle caused the fuel handling
building (FHB) area radiation monitor to alarm, resulting in a shift of the FHB
ventilation system to the iodine removal mode. The air grinder hose was not
monitored for radiation while it was being removed from the pool. Conservative
estimates by the licensee indicated that had the diver tender come in contact
(0.5 second) with the Co-60 particle with his hands, he could have received an
extremity dose of 895 mrem.
In October 1989, personnel at the Byron Station found unexpectedly high activity
Co-60 particles (8 mCi and 77 mCi) during efforts to decontaminate and remove a
portable filter assembly that had been used in an underwater vacuum cleaner to
clean the bottom of the SFS pool. Three individuals received unexpected doses
to their hands and forearms from these highly radioactive particles. These doses
were calculated to be 1.25, 1.95, and 11.6 rem.
Highly radioactive materials also have been lifted, unexpectedly, to the surface
of SFS pools. At the FitzPatrick plant in February 1987, a worker received an
overexposure to the hand during the cutting and removal of in-core instrumentation
dry tubes from the reactor vessel. During this operation, the cutting tool was
removed from the water for inspection. A piece of highly radioactive dry tube
that had been stuck in the tool fell out on the refueling floor. A worker im- mediately picked up the piece of dry tube and threw it back into the water. As
a result of this brief contact with the dry tube, the worker received a radiation
dose of about 30 rem to his hand, which exceeds the NRC limit of 18.75 rem per
calendar quarter.
IN 90-33 May 9, 1990 had been
At the Callaway Plant, personnel discovered that an inadequate survey SFS pool on
made on an underwater fuel elevator following its removal fromto the read 1000 R/hour
April 23, 1989. On April 29, 1989, a metal object was found so that only a
at contact, but the object was shielded by the elevator structure object was
localized area exceeded 100 mR/hour. The highly radioactive metal that had been
found to be a piece of a torn grid strap from a fuel assembly
on April 21, 1989. Personnel had attempted to
repaired in the fuel elevator
flush the piece out of the bottom of the fuel basket. However, because the
piece was never seen in the fuel elevator basket and because no abnormal radiation
readings were reported, personnel incorrectly assumed that the piece had been
flushed from the elevator basket and was at the bottom of the fuel pool.
Event Involving Inadvertent Lifting-.f-Mlghly-Radicactive-Materialby.Moist
In April 1982 at the Peach Bottom Atomic Power Station, Unit 2,range) personnel in- (in the million R/hour control
advertently lifted a highly radioactive seconds. This event
rod blade (CRB) near the surface of the water for 5 to 10
was to be moved from the fuel prepara- occurred when a hafnium test blade (HFB) by a
tion machine to a CRB rack location. This evolution was being supervised HFB using the
senior licensed operator. When an operator attempted to move the on the HFB.
fuel grapple, the operator could not engage the temporary C clamp
successfully move the HFB to the
An auxiliary hoist was subsequently used to the operator proceeded
CRB rack location. After completing the HFB movement, to pull the hoist grapple to its normal storage location out ofan the water.
and picked up adjacent CRB.
While the hoist was rising, its grapple engaged grapple was still
The hoist limit switch stopped the upward movement when the
under 8 to 10 feet of water. At that time the operator, without grapple looking, used
the 'override" button to bypass the limit switch and raised the with
the attached CRB. The area radiation monitor started alarming as the grapple
the
with the CRB approached the surface of the water. Upon hearing the alarm, the water
refueling floor supervisor looked and saw a brown object approaching
surface and yelled, "Put it down, put it down." The grapple was stopped before
the CRB reached the surface. No radiological surveys were performed during
this evolution. However, individuals at the pool area were unnecessarily ex- posed to radiation. Although these doses were about 300 mrem or less, if the
CRB had reached the surface, the doses could have been much greater.
Event Involving Radiation Streaming
Underwater tools are designed with flood holes to allow water to fill the
hollow sections of tubes. These flood holes provide shielding against
radiation streaming from highly radioactive materials that are stored
under water. At Indian Point Station, Unit 3, in July 1989, a worker
using a tool to perform reconstitution of a spent fuel assembly noticed
that a 12-foot-long 3/4-inch-diameter hollow section of the tool did not
have a flood hole. As a result of this equipment design deficiency, the
worker received an unplanned exposure. Although the licensee estimated
that the worker received a radiation dose of only 30 mrem as a result of
this incident, a hollow tool filled with air rather than water can result
in much higher doses when the lower end bf the tool is under water and near
a highly radioactive source.
IN 90-33 May 9, 1990 Additional -Information:
Additional information on these events is provided in the documents listed in
Attachment 1. The NRC and licensee documents are available in the NRC Public
Document Room.
Discussion:
Although the events described above were associated with SFS pools, similar
problems can occur during the removal and handling of material from flooded
reactor cavities.
A review of licensee evaluations of these events, the licensee corrective
actions, and feedback from NRC inspectors indicate that the following radio- logical control considerations can help minimize the possibility of unexpected
exposures from radiation sources in SFS pools:
O Thorough evaluations of the contents of, and activities involving, SFS
pools from a radiological perspective to identify potential unexpected
exposure situations.
o Measures such as task analysis and training to ensure awareness of the
potential for uncontrolled, unplanned transfer of highly radioactive
materials, including highly radioactive particles, to the surface of
SFS pools with the attendant potential for high radiation exposure of
workers.
o Measures to ensure awareness of the need for thorough radiation surveys
of all materials being removed from SFS pools.
o Measures to eliminate or secure floatable material in SFS pools.
o Avoidance of the use of containers made of materials (particularly
plastics) that are subject to radiation damage and disintegration
for the storage of highly radioactive materials in SFS pools. If
such containers are used, limiting the radiation dose to the container
can be used to prevent disintegration of the container as a result of
radiation damage.
o Measures to ensure that highly radioactive objects stored under water
at one end of a line whose other end is secured above the surface of
the pool are not unexpectedly pulled to the surface.
o Measures to ensure awareness of the need to prevent radiation streaming
through hollow sections of handling tools.
O Enhanced use of alarming personal dosimeters and of alarming area radia- tion monitors around SFS pools.
IN 90-33 May 9, 1990 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 NRR project manager.
C ariles- ~E. i1,Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contacts: John D. Buchanan, NRR
(301) 492-1097 Ronald L. Nimitz, RI
(215) 337-5267 Attachments:
1. -Documents Providing Information on Events
Involving Spent Fuel Storage Pools
2. List of Recently Issued NRC Information Notices
- s_ Attachment 1 IN 90-33 May 9, 1990 Documents Providing Information on Events Involving
Spent Fuel Storage Pools
James A. FitzPatrick, June-1989-Event
° Inspection Report Nos. 50-333/89-08, August 10, 1989; 50-333/89-13, August 2, 1989; and 50-333/89-21, December 29, 1989.
Peach Bottom, -December-1984 Event
o Memorandum from R. R. Bellamy, Region I, to L. J. Cunningham, NRR,
August 16, 1989.
Millstone Unit-1, May 1987-Event
O Inspection Report No. 50-245/87-11, July 1, 1987.
Diablo Canyon,-December-1987.Event
o Inspection Report No. 50-275/88-01, February 12, 1988.
° LER 87-27-00 (Docket No. 50-275).
Byron, October 1989-Event
o Inspection Report No. 50-454/89-21, December 8, 1989.
James-A. Fitzpatrick, .February-1987 Event
° Inspection Report No. 50-333/87-07, March 11, 1987.
o Letter from John C. Brons, New York Power Authority, to the Director, Office of Inspection and Enforcement, NRC, May 21, 1987.
Callaway.-April- 1989-Event
O Inspection Report No. 50-483/89-16, September 8, 1989.
Peach Bottom,-April 1982.Event
o Inspection Report No. 50-277/82-11, July 13, 1982.
Indian Point Unit-3,-July-1989-Event
° Inspection Report No. 50-286/89-18, September 12, 1989.
t..
Attachmpnt 2 IZ 90-33 May 9. 1990
Page I of I
LIST OF RECENTLY ISSUED
RRC INFORMATION NOTICES
.ssau.ce
, Date CT IssaeW.te.
Tntorniron
lotic NoR. Subject Issueedte .... .
90-32 Surface Crack and Subsurface 5/3/90 All holders of OLs
Indications in the Weld of or CPsfor nuclear
A ReactorVessel Head powerreactors.
90-31 Update on Waste Form and 5/4/90 All holders of OLS
High Integrity Container or CPs for nucleer
Topical Report Review power reectors. fuel
Status. Identification cycle licenses, and
of Problems with Ceount certain by-product
Solidification. and materialslicenses.
Reporting of Waste Mishaps
90-30 Ultrasonic Inspection 5/11/90 All holdersof OLS
Techniques for Dissimilar or Cps for nuclear
Metal Welds power reactors.
90-29 Cracking of Cladding and 4/30/9C All holders of OLs
Its Heat-Affected Zone in or Cps for nuclear
the Base metal of a Reactor power reactors.
Vessel Head
90-28 Potential Error In High 4,30/90 All holders of OLs
Steamline Flow Setpoint or CPs for 3WRs.
90-27 ClarifIcation of the 4/30/90 All uranium fuel
Recent Revisions to the fabrication and
Regulatory Requirements conversion facilities.
for Packaging of Uranisum
Hexafluoride (UF6 ) for
Transportation
89-70, PossiblaIndications of 4/26/90 Ali holders of OLS
Supp. I Nsirepresented Vendor or Cps for nuclear
Products power reactors.
90-25 Inadequate Flow of 4/24/90 All holders of OLs
Essentiel ServiceWater or Cps for nuclear
to RoomCoolers and Heat power reactors.
Exchangers for Engineered
Safety-Feature System
.. .. . . .. . .. .. . ... .. .... .... ... ......... ....
OL
CP* Construction Permit
UNITED STATES FIRST CLASS MAIL
NUCLEAR REGULATORY COMMISSION POSTAGE & FEES PAID
USNRC
WASHINGTON, D.C. 2055 PERMIT No. 047 OFFICIAL BUSINESS
PENALTY FOR PRIVATE USE, $300,
12055500395 6 1. A11B1CO01- US NRC-OIR Cs
DIV OF I NFO SUP SVCS EC
CHEFS I ARCHIVES SVCS SC
W/F P1Z12 2 WASHINGTON D O5
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list | - Information Notice 1990-01, Importance of Proper Response to Self-Identified Violations by Licensees (12 January 1990, Topic: Uranium Hexafluoride)
- Information Notice 1990-02, Potential Degradation of Secondary Containment (22 January 1990)
- Information Notice 1990-03, Malfunction of Borg-Warner Bolted Bonnet Check Valves Caused by Failure of the Swing Arm (23 January 1990, Topic: Liquid penetrant)
- Information Notice 1990-04, Cracking of the Upper Shell-to-Transition Cone Girth Welds in Steam Generators, (26 January 1990, Topic: Nondestructive Examination)
- Information Notice 1990-05, Inter-System Discharge of Reactor Coolant (29 January 1990)
- Information Notice 1990-06, Potential for Loss of Shutdown Cooling While at Low Reactor Coolant Levels (29 January 1990)
- Information Notice 1990-07, New Information Regarding Insulation Material Performance and Debris Blockage of PWR Containment Sumps (30 January 1990)
- Information Notice 1990-08, KR-85 Hazards from Decayed Fuel (1 February 1990)
- Information Notice 1990-08, KR-85 Hazards From Decayed Fuel (1 February 1990)
- Information Notice 1990-09, Extended Interim Storage of Low-Level Radioactive Waste by Fuel Cycle and Materials Licensees (5 February 1990, Topic: Decommissioning Funding Plan)
- Information Notice 1990-10, Primary Water Stress Corrosion Cracking (PWSCC) of Inconel 600 (23 February 1990, Topic: Boric Acid, Hydrostatic, Liquid penetrant)
- Information Notice 1990-10, Primary Water Stress Corrosion Cracking of Inconel 600 (23 February 1990, Topic: Boric Acid, Hydrostatic, Nondestructive Examination, Liquid penetrant)
- Information Notice 1990-11, Maintenance Deficiency Associated with Solenoid-Operated Valves (28 February 1990)
- Information Notice 1990-12, Monitoring or Interruption of Plant Communications (28 February 1990)
- Information Notice 1990-13, Importance of Review and Analysis of Safeguards Event Logs (5 March 1990)
- Information Notice 1990-14, Accidental Disposal of Radioactive Materials (6 March 1990, Topic: Brachytherapy)
- Information Notice 1990-15, Reciprocity Notification of Agreement State Radiation Control Directors Before Beginning Work in Agreement States (17 March 1990, Topic: Uranium Hexafluoride)
- Information Notice 1990-16, Compliance with New Decommissioning Rule (7 March 1990)
- Information Notice 1990-17, Weight and Center of Gravity Discrepancies for Copes-Vulcan Valves (8 March 1990, Topic: Earthquake)
- Information Notice 1990-18, Potential Problems with Crosby Safety Relief Valves Used on Diesel Generator Air Start Receiver Tanks (9 March 1990)
- Information Notice 1990-18, Potential Problems With Crosby Safety Relief Valves Used on Diesel Generator Air Start Receiver Tanks (9 March 1990)
- Information Notice 1990-19, Potential Loss of Effective Volume for Containment Recirculation Spray at PWR Facilities (14 March 1990)
- Information Notice 1990-20, Personnel Injuries Resulting from Improper Operation of Radwaste Incinerators (22 March 1990)
- Information Notice 1990-21, Potential Failure of Motor-Operated Butterfly Valves to Operate Because Valve Seat Friction was Underestimated (22 March 1990)
- Information Notice 1990-21, Potential Failure of Motor-Operated Butterfly Valves to Operate Because Valve Seat Friction Was Underestimated (22 March 1990)
- Information Notice 1990-22, Unanticipated Equipment Actuations Following Restoration of Power to Rosemount Transmitter Trip Units (23 March 1990, Topic: Reactor Vessel Water Level)
- Information Notice 1990-23, Improper Installation of Patel Conduit Seals (4 April 1990)
- Information Notice 1990-24, Transportation of Model Spec 2-T Radiographic Exposure Device (10 April 1990)
- Information Notice 1990-24, Transportation of Model SPEC 2-T Radiographic Exposure Device (10 April 1990)
- Information Notice 1990-25, Loss of Vital AC Power With Subsequent Reactor Coolant System Heat-Up (16 April 1990)
- Information Notice 1990-25, Loss of Vital AC Power with Subsequent Reactor Coolant System Heat-Up (16 April 1990)
- Information Notice 1990-26, Inadequate Flow of Essential Service Water to Room Coolers and Heat Exchangers for Engineered Safety-Feature Systems (24 April 1990)
- Information Notice 1990-27, Clarification of the Recent Revisions to the Regulatory Requirements for Packaging of Uranium Hexafluoride (UF6) for Transportation (30 April 1990)
- Information Notice 1990-28, Potential Error In High Steamline Flow Setpoint (30 April 1990)
- Information Notice 1990-28, Potential Error in High Steamline Flow Setpoint (30 April 1990)
- Information Notice 1990-29, Cracking of Cladding and Its Heat-Affected Zone in the Base Metal of a Reactor Vessel Head (30 April 1990, Topic: Nondestructive Examination, Liquid penetrant)
- Information Notice 1990-30, Ultrasonic Inspection Techniques for Dissimilar Metal Welds (1 May 1999, Topic: Dissimilar Metal Weld)
- Information Notice 1990-31, Update on Waste Form and High Integrity Container Topical Report Review Status, Identification of Problems with Cement Solidification, and Reporting of Waste Mishaps (4 May 1990, Topic: Process Control Program)
- Information Notice 1990-31, Update on Waste form and High Integrity Container Topical Report Review Status, Identification of Problems with Cement Solidification, and Reporting of Waste Mishaps (4 May 1990, Topic: Process Control Program)
- Information Notice 1990-32, Surface Crack and Subsurface Indications in the Weld of a Reactor Vessel Head (3 May 1990)
- Information Notice 1990-33, Sources of Unexpected Occupational Radiation Exposures at Spent Fuel Storage Pools (9 May 1990)
- Information Notice 1990-34, Response to False Siren Activations (10 May 1990)
- Information Notice 1990-35, Transportation of Type a Quantities of Non-Fissile Radioactive Materials (24 May 1990)
- Information Notice 1990-37, Sheared Pinion Gear-To-Shaft Keys in Limitorque Motor Actuators (24 May 1990)
- Information Notice 1990-38, License and Fee Requirements for Processing Financial Assurance Submittals for Decommissioning (6 November 1990, Topic: Authorized possession limits)
- Information Notice 1990-39, Recent Problems with Service Water Systems (1 June 1990)
- Information Notice 1990-40, Results of NRC-Sponsored Testing of Motor-Operated Valves (5 June 1990, Topic: Weak link)
- Information Notice 1990-41, Potential Failure of General Electric Magne-Blast Circuit Breakers and Ak Circuit Breakers (12 June 1990)
- Information Notice 1990-42, Failure of Electrical Power Equipment Due to Solar Magnetic Disturbances (19 June 1990)
- Information Notice 1990-43, Mechanical Interference with Thermal Trip Function in GE Molded-Case Circuit Breakers (29 June 1990)
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