Hydrogen-Embrittlement of Raychem Cryofit CouplinesML031190196 |
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, 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: |
12/27/1991 |
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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-91-087, NUDOCS 9112200262 |
Download: ML031190196 (10) |
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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, 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 [[: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 [[: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 December 27, 1991 NRC INFORMATION NOTICE 91-87: HYDROGEN EMBRITTLEMENT OF RAYCHEM CRYOFIT
COUPLINGS
Addressees
All holders of operating licenses or construction permits for nuclear power
reactors.
Purpose
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information
notice to alert addressees regarding the possible hydrogen embrittlement of
Raychem Cryofit couplings that could result in failure. 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
In July 1991 at the Seabrook Station, the licensee measured an unidentified
leakage rate exceeding the 1.0 gpm technical specification limit from the
Reactor Coolant System while the plant was operating in Mode 1 at 100 percent
power. The source of the leak was determined to be in the vicinity of the
pressurizer and, following plant shutdown, was located specifically in the gas
space sampling line coming from the pressurizer. The leak was caused by a 360-
degree circumferential fracture at the midpoint of a Raychem Cryofit
coupling. During subsequent line inspection, a second Cryofit coupling located
in the same line fractured in a similar manner after an accidental physical
impact. Both couplings are located downstream of the root isolation valve.
Discussion
Raychem Cryofit couplings are hollow cylindrical devices made of a special
alloy (50 percent titanium and 50 percent nickel) called Tinel that expands as
temperature is decreased and contracts as temperature increases (because of a
phase change). When the coupling is properly installed, a rapid joining of
two pipe ends can effectively be performed. The licensee performed a
metallurgical examination of the failed couplings and of other couplings in the
Seabrook Station, correlated the metallurgical findings with the various
exposure environments, and determined that the cause of the coupling failure
was hydrogen embrittlement of the Tinel. The licensee also determined that.
the combination of high hydrogen content in the exposure medium and high
temperature was the critical determining.factor. No other combination of -
(9 22116Z#
KJ
IN 91-87 December 27, 1991 exposure environments resulted in degradation of the Tinel. The vendor had
been unaware of this application limitation for the Cryofit coupling since
testing in these environments had not been performed.
To address the above findings, the licensee removed and replaced
approximately 400 of the 3000 or more Cryofit couplings in the Seabrook
Station with socket-welded joints or compression fittings. Many of the
replacements were conservatively selected because of the safety implications
if they should fail (closely connected to the Reactor Coolant System
or located on containment penetrations).
This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact
the technical contact listed below or the appropriate Office of Nuclear
Reactor Regulation (NRR) project manager.
irles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical contact: Walter P. Haass, NRR
(301) 504-3219 Attachment: List of Recently Issued NRC Information Notices
Attachment
IN 91-87 December 27, 1991 LIST OF RECENTLY ISSUED
NRC INFORMATION NOTICES
Information Date of
Notice No. Subject Issuance Issued to
91-86 New Reporting Requirements 12/27/91 All licensees authorized
for Contamination Events at to use byproduct materials
Medical Facilities for human use.
(10 CFR 30.50)
91-85 Potential Failures of 12/26/91 All holders of OLs or CPs
Thermostatic Control Valves for nuclear power reactors.
for Diesel Generator Jacket
Cooling Water
91-84 Problems with Criticality 12/26/91 All Nuclear Regulatory
Alarm Components/Systems Commission (NRC) fuel
cycle licensees, interim
spent fuel storage licens- ees, and critical mass
licensees.
91-83 Solenoid-Operated Valve 12/20/91 All holders of OLs or CPs
Failures Resulted in for nuclear power reactors.
Turbine Overspeed
91-18, High-Energy Piping Failures 12/18/91 All holders of OLs or CPs
Supp. 1 Caused by Wall Thinning for nuclear power reactors.
91-82 Problems with Diaphragms 12/18/91 All holders of OLs or CPs
in Safety-Related Tanks for nuclear power reactors.
91-81 Switchyard Problems that 12/16/91 All holders of OLs or CPs
Contribute to Loss of for nuclear power reactors.
Offsite Power
91-80 Failure of Anchor 12/11/91 All holders of OLs or CPs
Head Threads on Post- for nuclear power reactors.
Tensioning System During
Surveillance Inspection
91-79 Deficiencies in the 12/06/91 All holders of OLs or CPs
Procedures for Instal- for nuclear power reactors.
ling Thermo-Lag Fire
Barrier Materials
OL = Operating License
CP = Construction Permit
UNITED STATES K-)s FIRST CLASS MAIL
NUCLEAR REGULATORY COMMISSION POSTAGE b FEES PAID
WASHINGTON, D.C. 20555 USNRC
PERMIT No G-7 OFFICIAL BUSINESS
PENALTY FOR PRIVATE USE, $300
IN 91-87 December 27, 1991 exposure environments resulted in degradation of the Tinel. The vendor had
been unaware of this application limitation for the Cryofit coupling since
testing in these environments had not been performed.
To address the above findings, the licensee removed and replaced
approximately 400 of the 3000 or more Cryofit couplings in the Seabrook
Station with socket-welded joints or compression fittings. Many of the
replacements were conservatively selected because of the safety implications
if they should fail (closely connected to the Reactor Coolant System
or located on containment penetrations).
This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact
the technical contact listed below or the appropriate Office of Nuclear
Reactor Regulation (NRR) project manager. Original Signod b
Charles E.Ro~sg
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical contact: Walter P. Haass, NRR
(301) 504-3219 Attachment: List of Recently Issued NRC Information Notices
OFC :VIB/DRIS :VIB/DRIS :BC:VIB/DRIS :D:DRIS :OGCB/NRR :DOEA/NRR
____- _ __ __ __ _ ___-__ __ _ __ __ __ ___------:--------------
- --------------:---,,-- - - --- --- -- c--
NAME :WHaass :GCwalina :LNorrholm :BGrimes :CBerlinger : m y
DATE :11/7/91* :11/7/91* :11/19/91* : 12/16/91* :12/17/91* :12J~>l
OFC :Tech Editor :RI
NAME :JMain :JDurr : :
DATE :11/01/91* :11/18/91*
OFFICIAL RECORD COPY
Document Name: IN 91-87
INl XX-XX
December XX, 1991 exposure environments resulted in degradation of the Tinel. The vendor had
been unaware of this application limitation for the Cryofit coupling since
testing in these environments had not been performed.
To address the above findings, the licensee removed and replaced
approximately 400 of the 3000 or more Cryofit couplings in the Seabrook
Station with socket-welded joints or compression fittings. Many of the
replacements were conservatively selected because of the safety implications
if they should faile (closely connected to the Reactor Coolant System
or located on containment penetrations).
This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact
the technical contact listed below or the appropriate Office of Nuclear
Reactor Regulation (NRR) project manager.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Walter P. Haass, NRR
301-492-3219 Attachment: List of Recently Issued NRC Information Notices
DISTRIBUTION
CBerlinger VIB R/F DRIS R/F BKGrimes
WHaass ERossi LNorrholm GCwalina
- SEE PREVIOUS CONCURRENCE 6C X
OFC :VIB/DRIS :VIB/DRIS :BC:VIB/DRIS :D:DRIS :OGCB/NRR :DOEA/NRR
NAME :WHaass :GCwalina :LNorrholm :BGrimes :CBerlinger :CRossi
DATE :11/7/91* :11/7/91* :11/19/91* 12/16/91 :UrL/17/91 OFC :Tech Editor :RI
NAME : :JDurr : :
DATE :11/01/91* :11/18/91* : :
OFFICIAL RECORD COPY
Document Name: RAYCHMIN
IN XX-XX
December XX, 1991 exposure environments resulted in degradation of the Tinel. The vendor had
been unaware of this application limitation for the Cryofit coupling since
testing in these environments had not been performed.
To address the above findings, the licensee removed and replaced
approximately 400 of the 3000 or more Cryofit couplings in the Seabrook
Station with socket-welded joints or compression fittings. Many of the
replacements were conservatively selected because of the safety implications
if they should faile (closely connected to the Reactor Coolant System
or located on containment penetrations).
This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact
the technical contact listed below or the appropriate Office of Nuclear
Reactor Regulation (NRR) project manager.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Walter P. Haass, NRR
301-492-3219 Attachment: List of Recently Issued NRC Information Notices
DISTRIBUTION
CBerlinger VIB R/F DRIS R/F BKGrimes
WHaass ERossi LNorrholm GCwalina
OC :IDIS :IDIS :BC:ID:D' :0:DOEA/NRR
NAME :WHaass :GCwalina :LNorrholm /IcG#lp:CBerlinger :CRossi
DATE :11/7/91* :11/7/91* :11/19/91* : 1t-//4/91 : / /91 OFC :Tech Editor :RI
NAME : :JDurr
DATE :11/01/91* :11/18/91* :
OFFICIAL RECORD COPY
Document Name: RAYCHMIN
IN XX-XX
--- November XX, 1991 exposure environments resulted in degradation of the Tinel. The vendor had
been unaware of this application limitation for the Cryofit coupling since
testing in these environments had not been performed.
As a result of the above findin gthe licensee removed and replaced
.approximately 400 of the 3000 more Cryofit couplings in the Seabrook
Station with socket-welded joints or compression fittings. Many of the
replacements were conservatively selected because of the safety implications
related to potential failure (closely connected to the Reactor Coolant System
or located on containment penetrations).
This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact
the technical contact listed below or the appropriate Office of Nuclear
Reactor Regulation (NRR) project manager.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Walter P. Haass, NRR
301-492-3219 Attachment: List of Recently Issued NRC Information Notices
DISTRIBUTION
CBerlinger VIB R/F DRIS R/F BKGrimes
WHaass ERossi LNorrholm GCwalina
OFC :VIB/DRIS :VIB/DRIS :BC:VIB/DRIS :D I :CB/NRR :DOEA/NRR
NAME :WHaass :GCwalina :LNorrholm / es :CBerlinger :CRossi
DATE :11/7/91* :11/7/91* :11/19/91* :(z//G/91 C : / /91 OFC :Tech Editor :RI
NAME : :JDurr
DATE :11/01/91* :11/18/91* :
OFFICIAL RECORD COPY
Document Name: RAYCHMIN
IN XX-XX
November XX, 1991 Discussion
Raychem Cryofit couplings are hollow cylindrical devices made of a special
alloy (50 percent titanium and 50 percent nickel) called Tinel that expands as
temperature is decreased and contracts as temperature increases (because of a
phase change). When the coupling is properly installed, a rapid joining of
two pipe ends can effectively be performed. The licensee performed a
metallurgical examination of the failed couplings and of other couplings in
the Seabrook Station, correlated the metallurgical findings with the various
exposure environments, and determined that the cause of the coupling failure
was hydrogen embrittlement of the Tinel. The licensee also determined that
the combination of high hydrogen content in the exposure medium and high
temperature was the critical determining factor. No other combination of
exposure environments resulted in degradation of the Tinel. The vendor had
been unaware of this application limitation for the Cryofit coupling since
testing in these environments had not been performed.
As a result of the above findings, the licensee removed and replaced
approximately 400 of the 3000 or more Cryofit couplings in the Seabrook
Station with socket-welded joints or compression fittings. Many of the
replacements were conservatively selected because of the safety implications
related to their potential failure (closely connected to the Reactor Coolant
System or located on containment penetrations).
This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact
the technical contact listed below or the appropriate Office of Nuclear
Reactor Regulation (NRR) project manager.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Walter P. Haass, NRR
301-492-3219 Attachment: List of Recently Issued NRC Information Notices
OFC :VIB:DRIS :VIB:DRIS :BC: B:DRIS :D:DRIS :OGCB/NRR :DOEA/NRR
________________ ______________ ___ _____
_____________
______________ ___ __ __ __
NAME :WHaass :GCwalina :L :BKGrimestid :CBerlinger :CRossi
DATE :\k / /91
/1 : / /9191 : / /91 OFC :Tech. Editor :RI
:---------------:-Af-k i7~-------------- -------------- -------------- -------------
NAME : Jfain / :JD
DATE :11/01/91 0'Il/l/91 : / /91 / /91 OFFICIAL RECORD COPY Document Name: RAYCHTMIN
DISTRIBUTION: VIB Reading DRIS Reading BKGrimes
CBerlinger Rossi LNorrholm GCwalina
VlHaass
K * K J
Discussion
Raychem Cryofit couplings are hollow cylindrical devices made of a special
alloy (50 percent titanium and 50 percent nickel) called Tinel that expands as
temperature is decreased and contracts as temperature increases (because of a
phase change). When the coupling is properly installed, a rapid joining of
two pipe ends can effectively be performed. The licensee performed a
metallurgical examination of the failed couplings and-of other couplings in
the Seabrook Station, correlated the metallurgical findings with the various
exposure environments, and determined that the cause of the coupling failure
was hydrogen embrittlement of the Tinel. The licensee also determined that
the combination of high hydrogen content in the exposure medium and high
temperature was the critical determining factor. No other combination of
exposure environments resulted in degradation of the Tinel. The vendor had
been unaware of this application limitation for the Cryofit coupling since
testing in these environments had not been performed.
As a result of the above findings, the licensee removed and replaced
approximately 400 of the 3000 or more Cryofit couplings in the Seabrook
Station with socket-welded joints or compression fittings. Many of the
replacements were conservatively selected because of the safety implications
related to their potential failure (closely connected to the Reactor Coolant
System or located on containment penetrations).
This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact
the technical contact listed below or the appropriate Office of Nuclear
Reactor Regulation (NRR) project manager.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Walter P. Haass, NRR
301-492-3219 Attachment:
List of Recently Issued NRC Information Notices
OFC :VIB:D~'i :VIB:DRIS :BC:VIB:DRIS :D:DRIS :OGCB/NRR :DOEA/NRR
NAME :WH sE I :GC :LNorrholm :BKGrimes :CBerlinger :CRossi
DATE :I1/ 7 /91 :/ /91 : / /91 /91 : / /91 /91 OFC :Tech. Editor :RI
NAME : :JDurr : :
DATE :11/01/91 : / /91 : / /91 / /91 OFFICIAL RECORD COPY
Document Name: RAYCHMIIN
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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)
... further results |
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