Potential Problems in Generators Manufactured by Electrical Products IncorporatedML031220661 |
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, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant, Skagit, Marble Hill |
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Issue date: |
04/17/1986 |
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From: |
Jordan E L NRC/IE |
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To: |
|
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References |
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IN-86-026, NUDOCS 8604150542 |
Download: ML031220661 (5) |
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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, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant, Skagit, Marble Hill |
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Category:NRC Information Notice
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Appendix VI: NRC FOIA Responses (B-51 Through B-53); Turkey Point Event Report; NRC Information Notice 2010-12: Containment Liner Cor Information Notice 2010-12, Intervenors' Fifth Motion to Amend And/Or Supplement Proposed Contention No. 5 (Shield Building Cracking). Appendix VI: NRC FOIA Responses (B-51 Through B-53); Turkey Point Event Report; NRC Information Notic2012-08-17017 August 2012 Intervenors' Fifth Motion to Amend And/Or Supplement Proposed Contention No. 5 (Shield Building Cracking). 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Mclaughlin on NRC, Regarding NRC Information Notice 2006-13: Groundwater Contamination2006-07-13013 July 2006 E-mail from M. Mclaughlin on NRC, Regarding NRC Information Notice 2006-13: Groundwater Contamination 2020-09-03 The following query condition could not be considered due to this wiki's restrictions on query size or depth: <code> [[:Beaver Valley]] OR [[:Millstone]] OR [[:Hatch]] OR [[:Monticello]] OR [[:Calvert Cliffs]] OR [[:Dresden]] OR [[:Davis Besse]] OR [[:Peach Bottom]] OR [[:Browns Ferry]] OR [[:Salem]] OR [[:Oconee]] OR [[:Mcguire]] OR [[:Nine Mile Point]] OR [[:Palisades]] OR [[:Palo Verde]] OR [[:Perry]] OR [[:Indian Point]] OR [[:Fermi]] OR [[:Kewaunee]] OR [[:Catawba]] OR [[:Harris]] OR [[:Wolf Creek]] OR [[:Saint Lucie]] OR [[:Point Beach]] OR [[:Oyster Creek]] OR [[:Watts Bar]] OR [[:Hope Creek]] OR [[:Grand Gulf]] OR [[:Cooper]] OR [[:Sequoyah]] OR [[:Byron]] OR [[:Pilgrim]] OR [[:Arkansas Nuclear]] OR [[:Three Mile Island]] OR [[:Braidwood]] OR [[:Susquehanna]] OR [[:Summer]] OR [[:Prairie Island]] OR [[:Columbia]] OR [[:Seabrook]] OR [[:Brunswick]] OR [[:Surry]] OR [[:Limerick]] OR [[:North Anna]] OR [[:Turkey Point]] OR [[:River Bend]] OR [[:Vermont Yankee]] OR [[:Crystal River]] OR [[:Haddam Neck]] OR [[:Ginna]] OR [[:Diablo Canyon]] OR [[:Callaway]] OR [[:Vogtle]] OR [[:Waterford]] OR [[:Duane Arnold]] OR [[:Farley]] OR [[:Robinson]] OR [[:Clinton]] OR [[:South Texas]] OR [[:San Onofre]] OR [[:Cook]] OR [[:Comanche Peak]] OR [[:Yankee Rowe]] OR [[:Maine Yankee]] OR [[:Quad Cities]] OR [[:Humboldt Bay]] OR [[:La Crosse]] OR [[:Big Rock Point]] OR [[:Rancho Seco]] OR [[:Zion]] OR [[:Midland]] OR [[:Bellefonte]] OR [[:Fort Calhoun]] OR [[:FitzPatrick]] OR [[:McGuire]] OR [[:LaSalle]] OR [[:05000000]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] OR [[:Skagit]] OR [[:Marble Hill]] </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 [[:05000000]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] OR [[:Skagit]] OR [[:Marble Hill]] </code>. |
SSINS No.: 6835 IN 86-26 UNITED STATES NUCLEAR REGULATORY
COMMISSION
OFFICE OF INSPECTION
AND ENFORCEMENT
WASHINGTON, D.C. 20555 April 17, 1986 INFORMATION
NOTICE NO. 86-26: POTENT1AL
PROBLEMS IN GENERATORS
MANUFACTURED
BY ELECTRICAL
PRODUCTS INCORPORATED
Addressees
All nuclear power reactor facilities
holding an operating
license (OL) or a construction
permit (CP).
Purpose
- This notice is to alert recipients
to a potentially
significant
problem involving the failure of Electrical
Products Incorporated (EPI) diesel generators
without prior warning during an emergency
demand. Actions taken by licensees
to prevent recurrence
also are discussed.
It is expected that recipients
will review this information
for applicability
to their facilities
and consider actions, if appropriate, to preclude a similar problem occurring
at their facilities.
However, suggestions-contained
in this information
notice do not constitute
NRC requirements;
therefore, no specific action or written response is required.Description
of Circumstances:
Washington
Public Power Supply System (WPPSS) Unit 2 On July 21, 1983, emergency
diesel generator (DG) 1A had high vibration
level readings accompanied
by sparks from the rotor shaft bearing area. Upon disas-sembly it was determined
that a shim, required to maintain clearance
at the thrust bearing, was missing. Inspection
of DG 1B showed that the same shim was missing. The two generators
were returned to EPI (Cleveland, Ohio) where the missing shim was installed
and the damaged areas refurbished.
The original design, which placed electrical
insulation
between the rotor shaft and the slip-ring
end bearing inner race, was maintained.
On July 9, 1984, during monthly surveillance
testing, a high vibration
alarm was observed on emergency
DG 1B. Investigation
after completion
of the 4-hour test revealed that the slip-ring
end bearing had turned on the shaft insulation
destroying
the insulation.
The reduction
in insulation
cross sectional
thick-ness allowed the rotor shaft to drop slightly and rub on the bearing housing.The corrective
action employed after this failure was a design modification.
The insulation
between the bearing and the shaft was removed and the bearing was mounted directly on the shaft. The bearing housing was insulated
to provide the required electrical
insulation.
No failure has-been reported since the reported test failure in July 1984.8604150542
testing, the generator
failed and was observed to be emitting sparks. Power Systems Division (PSD) of Morrison Knudsen, the supplier of the DG unit, determined
that the electrical
insulation
between the inner race of the cylindrical
roller bearing at the slip-ring
end and the rotor shaft had degraded.
The degradation
allowed the shaft to drop down and rub the inner and outer oil seals causing the sparks. EPI and PSD have developed a procedure
to implement
the same design modification
at Grand Gulf as used previously
at WPPSS.Watts Bar Unit 2 On June 10, 1983, during the performance
of a test, the generator
shaft was observed to be rubbing against the inner and outer oil seals at the slip-ring end. Examination
after disassembly
revealed that the thickness
of the oil thrower was less than specified, causing a mismatch between the inner and outer races of the slip-ring
end bearing that resulted in the inner race breaking loose and turning on the underlying
electrical
insulation.
The repairs at a Tennessee
Valley Authority (TVA) workshop consisted
of rebuil-ding oil seals, polishing
the shaft under the oil seals, replacing
the insula-tion material under the bearing, machining
the bearing housing cap to correct the alignment, adding a shim to restrain the outer race, and installing
new bearings.
TVA inspected
four other generators
and made similar modifications.
Background:
The failures occurred in electrical
generators
manufactured
at EPI located in Cleveland, Ohio. EPI was a division of Portec from 1969-1979.
In 1979, Portec sold EPI to Northern Electrical
Industries-Parsons
Peebles (NEI-Peebles)
of Great Britain. The manufacturing
operations
at Cleveland
ceased in the Fall of 1984. Currently, EPI furnishes
spare parts and modifications
to existing units.Discussion:
The failures described
above have all occurred at the slip-ring
end of the tandem diesel engine configurations.
Installation
of the insulation
between the rotor shaft and the bearing also is used for single engine applications
and in some cases it is installed
under the shaft bearing at the other end of the generator as well. The purpose of the insulation
(3M Scotchply
brand, type 1009, glass/epoxy
composite
tape) is to prevent circulating
currents through the generator
shaft.This insulation
method was limited by EPI to 8-pole 900-rpm machines.
The initiating
failure mechanism
of the insulation
has been attributed
by various sources to insulation
creep fatigue, misalignment
of the engines, poor insulation
workmanship, or inadequate
original design. The first WPPSS and the Watts Bar failures appear-to
be isolated cases of improperly
machined pieces; however, the failures manifest themselves
in a similar manner and may be discovered
during the checks for insulation
damage.
IN 86-26 April 17, 1986 PSD has stated that a procedure
to monitor shaft movement will have to be specific for each plant because of design differences
that impact the allowable
movement and the jacking force. Jacking the shaft up and down and recording
the movement will determine
the vertical play between the shaft and bearing housing, out care should be taken to use a load cell or circle force gauge between the jack and the generator
shaft to prevent damage.Other suppliers
that have used EPI generators
include Stewart & Stevenson, Alco and Bruce GM (EMD). See Attachment
1 for a list of facilities
identified
oy EPI and PSD as recipients
of the subject generators.
Some of the generators
nave been resold from the original customer or user and some have been cancelled;
therefore
specific plant applications
may be different
than originally
supplied.No specific action or written response is required by this notice. If you nave any questions
regarding
this notice, please contact the Regional Aaministrator
of the appropriate
NRC regional office or this office.X\visli/f Edward L ordan, Director Divisior of Emergency
Preparedness
and Engineering
Response Office of Inspection
and Enforcement
Tecnnical
Contacts:
James C. Stewart, IE (301) 492-9061 K.R. Naidu, IE (301) 492-4179 Attachments:
I. List of EPI 900 RPM Generators
2. List of Recently Issued IE Information
Notices
Attachment
1 IN 86-26 April 17, 1986 Domestic EPI 900 RPM Generators
Customer/Site
No. Units D/G Supplier Arkansas P&L/Nuclear
1 Boston Edison/Pilgrim
1 Duke Power/Oconee
Florida P&L/St. Lucie Houston L&P/Allens
Creek Jersey Central P&L/Oyster
Creek Mississippi
P&L/Grand
Gulf Mississippi
P&L/Grand
Gulf New York State Power Authority/FitzPatrick
Pacific G&E/Diablo
Canyon Portland G&E/Trojan
Public Service of Oklahoma/Black
Fox Puget Sound/Skaggit
SMUD/Rancho
Seco TVA/Hartsville, Phipps Bend TVA/Sequayah
TVA/Sequayah
TVA/Watts
Bar Vepco/North
Anna WPPSS/Hanford
1 2 2 1 2 1 2 2 2 4 5 2 2 1 2 6 4 1 6 4 2 (See Note 1)(See Note 2)(See Note 3)(See Note 4)Stewart & Stevenson ALCO PSD PSD PSD PSD PSD Bruce GM (EMD)Bruce GM (EMD)ALCO PSD PSD PSD Bruce GM (EMD)PSD Bruce GM (EMD)PSD PSD Stewart & Stevenson Stewart & Stevenson Notes: 1. Generator
returned to PSD 2. Obtained from TVA 3. One unit sent to foreign plant, one unit spare 4. Two units to Oyster Creek, three units sent to foreign plants, one unit sent to NASA
Attachnient
2 IIN 86-26 April 17, 1986 LIST OF RECENTLY ISSUED IE INFORMATION
NOTICES Information
Date of Notice No. Subject Issue __Issued to-86-25 Traceability
And Material Control Of Material And Equipment, Particularly
Fasteners 4/11/86 86-24 Respirator
Users Notice: 4/11/86 Increased
Inspection
Frequency For Certain Self-Contained
Breathing
Apparatus
Air Cylinders 86-23 86-22 86-21 Excessive
Skin Exposures
Due To Contamination
With Hot Particles Underresponse
Of Radition Survey Instrument
To High Radiation
Fields Recognition
Of American Society Of Mechanical
Engineers
Accreditation
Program For N Stamp Holders Low-Level
Radioactive
Waste Scaling Factors, 10 CFR Part 61 Reactor Coolant Pump Shaft Failure At Crystal River NRC On-Scene Response During A Major Emergency 4/9/86 3/31/86 3/31/86 3/28/86 3/21/86 3/26/86 All power reactor facilities
holding an OL or CP All power reactor facilities
holding an OL or CP; research and test reactor facilities;
fuel cycle licensees
and Priority 1 material licensees All power reactor facilities
holding an OL or CP All power reactor facilities
holding an OL or CP and research and test reactors All power reactor facilities
holding an OL or CP and all recipients
of NUREG-0040 (white book)All power reactor facilities
holding an OL or CP All power reactor facilities
holding an OL or CP All power reactor facilities
holding an OL or CP 86-20 86-19 86-18 OL = Operating
License CP = Construction
Permit
|
---|
|
list | - Information Notice 1986-01, Failure of Main Feedwater Check Valves Causes Loss of Feedwater System Integrity and Water-Hammer Damage (6 January 1986)
- Information Notice 1986-02, Failure of Valve Operator Motor During Environmental Qualification Testing (6 January 1986)
- Information Notice 1986-03, Potential Deficiencies in Enviromental Qualification of Limitorque Motor Valve Operator Wiring (14 January 1986)
- Information Notice 1986-04, Transient Due to Loss of Power to Intergrated Control System at a Pressurized Water Reactor Designed by Babcock & Wilcox (31 January 1986)
- Information Notice 1986-05, Main Steam Safety Valve Test Failures and Ring Setting Adjustments (31 January 1986)
- Information Notice 1986-06, Failure of Lifting Rig Attachment, While Lifting Upper Guide Structure at St. Lucie Unit 1 (3 February 1986, Topic: Control of Heavy Loads)
- Information Notice 1986-06, Failure of Lifting Rig Attachment, while Lifting Upper Guide Structure at St. Lucie Unit 1 (3 February 1986)
- Information Notice 1986-07, Lack of Detailed Instruction & Inadequate Observance of Precautions During Maintenance & Testing of Diesel Generator Woodward Governors (3 February 1986)
- Information Notice 1986-08, Licensee Event Report (LER) Format Modification (3 February 1986)
- Information Notice 1986-09, Failure of Check & Stop Check Valves Subjected to Low Flow Conditions (3 February 1986)
- Information Notice 1986-10, Degradation of Reactor Coolant System Pressure Boundary Resulting From Boric Acid Corrosion. (5 January 1995, Topic: Boric Acid)
- Information Notice 1986-10, Feedwater Line Break (10 November 1988, Topic: Coatings, Anchor Darling)
- Information Notice 1986-10, Degradation of Reactor Coolant System Pressure Boundary Resulting from Boric Acid Corrosion. (5 January 1995, Topic: Boric Acid)
- Information Notice 1986-11, Anomalous Behavior of Recirculation Loop Flow in Jet Pump BWR Plants (31 December 1986)
- Information Notice 1986-13, Standby Liquid Control System Squib Valves Failure to Fire (21 February 1986, Topic: Squib)
- Information Notice 1986-13, Standby Liquid Control Squib Valves Failure to Fire (5 August 1986, Topic: Squib)
- Information Notice 1986-14, Overspeed Trips of AFW, HPCI & RCIC Turbines (26 August 1991, Topic: Fire Barrier)
- Information Notice 1986-14, Overspeed Trips of Afw, HPCI & RCIC Turbines (26 August 1991)
- Information Notice 1986-15, Loss of Offsite Power Caused by Problems in Fiber Optics Systems (10 March 1986, Topic: Squib)
- Information Notice 1986-16, Failures to Identify Containment Leakage Due to Inadequate Local Testing of BWR Vacuum Relief System Valves (11 March 1986, Topic: Squib)
- Information Notice 1986-17, Update of Failure of Automatic Sprinkler System Valves to Operate (24 March 1986, Topic: Squib)
- Information Notice 1986-18, NRC On-Scene Response During a Major Emergency (26 March 1986, Topic: Squib, Backfit)
- Information Notice 1986-19, Reactor Coolant Pump Shaft Failure at Crystal River (21 March 1986, Topic: Squib)
- Information Notice 1986-20, Low-Level Radioactive Waste Scaling Factors, 10 CFR Part 61 (28 March 1986, Topic: Squib)
- Information Notice 1986-21, Recognition of American Society of Mechanical Engineers Accreditation Program for N Stamp Holders (31 March 1986, Topic: Squib)
- Information Notice 1986-22, Underresponse of Radiation Survey Instrument to High Radiation Fields (31 March 1986, Topic: High Radiation Area, Squib)
- Information Notice 1986-23, Excessive Skin Exposures Due to Contamination with Hot Particles (9 April 1986)
- Information Notice 1986-23, Excessive Skin Exposures due to Contamination with Hot Particles (9 April 1986)
- Information Notice 1986-24, Respirator Users Notice: Increased Inspection Frequency for Certain Self-Contained Breathing Apparatus Air Cylinders (11 April 1986, Topic: Hydrostatic)
- Information Notice 1986-25, Traceability and Material Control of Material and Equipment, Particularly Fasteners (11 April 1986)
- Information Notice 1986-26, Potential Problems in Generators Manufactured by Electrical Products Incorporated (17 April 1986)
- Information Notice 1986-27, Access Control at Nuclear Facilities (21 April 1986, Topic: Contraband)
- Information Notice 1986-28, Telephone Numbers to the NRC Operations Center and Regional Offices (24 April 1986)
- Information Notice 1986-29, Effects of Changing Valve Moter-Operator Switch Settings (25 April 1986)
- Information Notice 1986-30, Design Limitations of Gaseous Effluent Monitoring Systems (29 April 1986)
- Information Notice 1986-31, Unauthorized Transfer and Loss of Control of Industrial Nuclear Gauges (14 July 1986)
- Information Notice 1986-32, Request for Collection of Licensee Radioactivity Measurements Attributed to Chernobyl Nuclear Plant Accident (2 May 1986, Topic: Chernobyl)
- Information Notice 1986-33, Information for Licensee Regarding the Chernobyl Nuclear Plant Accident (6 May 1986, Topic: Chernobyl)
- Information Notice 1986-34, Improper Assembly, Material Selection, & Test of Valves & Their Actuators (13 May 1986)
- Information Notice 1986-34, Improper Assembly, Material Selection, & Test of Valves & their Actuators (13 May 1986)
- Information Notice 1986-35, Fire in Compressible Material at Dresden Unit 3 (15 May 1986, Topic: Chernobyl)
- Information Notice 1986-36, Change in NRC Practice Regarding Issuance of Confirming Letters to Principal Contractors (16 May 1986, Topic: Chernobyl)
- Information Notice 1986-37, Degradation of Station Batteries (16 May 1986, Topic: Chernobyl)
- Information Notice 1986-38, Deficient Operator Actions Following Dual Function Valve Failures (20 May 1986, Topic: Chernobyl)
- Information Notice 1986-39, Failures of RHR Pump Motors and Pump Internals (20 May 1986, Topic: Chernobyl)
- Information Notice 1986-40, Degraded Ability to Isolate the Reactor Coolant System from Low-Pressure Coolant Systems in Bwrs (5 June 1986, Topic: Chernobyl)
- Information Notice 1986-40, Degraded Ability to Isolate the Reactor Coolant System from Low-Pressure Coolant Systems in BWRs (5 June 1986, Topic: Chernobyl)
- Information Notice 1986-41, Evaluation of Questionable Exposure Readings of Licensee Personnel Dosimeters (9 June 1986, Topic: Chernobyl)
- Information Notice 1986-42, Improper Maintenance of Radiation Monitoring Systems (9 June 1986, Topic: Temporary Modification, Chernobyl)
- Information Notice 1986-43, Problems with Silver Zeolite Sampling of Airborne Radioiodine (10 June 1986, Topic: Chernobyl)
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