Water Hammer & Possible Piping Damage Caused by Misapplication of Kerotest Packless Metal Diaphragm Globe ValvesML031150503 |
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 |
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Issue date: |
04/18/1988 |
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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-88-013, NUDOCS 8804110007 |
Download: ML031150503 (6) |
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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 |
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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 [[: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 [[: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]] </code>. |
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON D.C. 20555 April 18, 1988 NRC INFORMATION NOTICE NO. 88-13: WATER HAMMER AND POSSIBLE PIPING DAMAGE
CAUSED BY MISAPPLICATION OF KEROTEST
PACKLESS METAL'DIAPHRAGM GLOBE VALVES
Addressees
All holders of operating licenses or construction permits for nuclear power
reactors.
Purpose
This information notice is being provided to alert-addressees to potential
problems resulting from the-improper application of packless metal diaphragm
valves supplied by the Kerotest Manufacturing Corp. It isexpected 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
Kerotest Y-pattern packless metal diaphragm globe valves are used in a variety
of applications innuclear power plant reactor systems. These valves are de- signed to meet each owner's equipment specifications. However, incidents have
occurred involving flow throttling and reverse flow as a result of the misap- plication of these valves.
On August 6, 1984, McGuire Unit 2 operators discovered a broken weld on the let- down line of the residual heat removal system. The system was inuse at.the time
and contaminated water was spraying from the broken pipe and from the stem of a
valve. A subsequent inspection revealed a number of damaged supports/restraints
and a broken socket weld that had completely separated. On April 5, 1985, seven
socket welds with crack indications were discovered on additional piping in this
- system, although no welds had failed as they had inthe August 1984 event. The
root cause of these problems was attributed to excessive piping vibration induced
by "'chugging" during reverse flow through Kerotest Y-pattern packless metal
diaphragm globe valves.
On May 12, 1987, while Trojan operators were transferring water from the "All ac- cumulator via backflow through the fill line to the I'D" accumulator, the fill
line ruptured at the "A"accumulator nozzle-to-pipe weld. On May ?3, 1987, after
the broken line Ifad been repaired, operators again attempted to transfer water, and the fill line ruptured at the same location. The cause of the event was
attributed to backflow through the Kerotest Y-patter'n packless metal diaphragm
globe valve in the "A"l accumulator fill line. This backflow created a cyclic
8804110007
IN 88-13 April 18, 1988 Page ? of 2 vibration of the valve disk. This vibration induced high enough stresses in
the fill line to cause the pipe rupture.
On February 22, 1988, while Braidwood Unit 1 was draining the "D" accumulator, the fill line ruptured at a location similar to the location of a break pre- viously reported at Byron, which was not analyzed by the licensee. The break
location was also similar to that at Trojan. This line has a Kerotest Y-pattern
packless metal diaphragm globe valve installed. Analysis of the break determined
that it was caused by high cycle fatigue. The licensee has not been able to rule
out valve "chugging" as the cause of the high cycle fatigue.
Discussion:
Reverse flow through Kerotest Y-pattern packless metal diaphragm globe valves
has caused broken piping welds at two nuclear plants and may be responsible for
other broken welds where the root cause has not been identified. Because of
the stem and disk design used in Kerotest Y-pattern packless metal diaphragm
globe valves, these valves are not intended for applications that require flow
throttling or that subject the valves to reverse flow. Reverse flow in these
valves can result in "chugging" that induces flow vibrations and water hammer.
It may not be clear to plant operating personnel that violating these appli- cation criteria can result in serious consequences such as weld cracks and
pipe ruptures that breach the primary coolant pressure boundary.
The manufacturer's product literature did not clearly state that certain valve
types;s-hould notbe subjected to reverse flow or used for flow throttling. Older
issues of Kerotest instruction and engineernfgq manuals do not-worn usrs of-thei- valves' unidirectional flow properties. More recent editions have corrected this
deficiency; however, licensees may not have the corrected manual.
Purchase specifications may have been written without regard to flow direc- tionality because the manufacturer's literature did not note its importance.
This may have caused the improper use of these valves in applications where
bi-directional flow is anticipated either in normal operation or in coping
with emergency situations that require other-than-normal plant lineups.
No specific action or written response is required by this information notice.
If you have any questions about this matter, please contact the technical
contact listed below or the Regional Administrator of the appropriate regional
office.
Charles . Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Rudy 0. Karsch, NRR
(301) 492-1178 Attachment: List of Recently Issued NRC Information Notices
K)
Attachment
IN 88-13 April.18e , 1988
.. f. . .
tIST OF RECENTLY ISSUED
NRC INFORMATION NOTICES
Information Date of
Notice No. Subject Issuance Issued to
88-12 Overgreasing of Electric 4/12/88 All holders of ULs
Motor Bearings or CPs for nuclear
power reactors.
88-11 Potential Loss of Motor 4/7/88 All holders of OLs
Control Center and/or or CPs for nuclear
Switchboard Function Due power reactors..
to Faulty Tie Bolts
88-10 Materials Licensees: Lack 3/28/88 All NRC licensees
of Management Controls Over authorized to use
Licensed Programs byproduct material.
87-44, Thimble Tube Thinning in 3/28/88 All holders of OLs
Supp. 1 Westinghouse Reactors or CPs for nuclear
power reactors that
employ a Westinghouse
NSSS.
88-09 Reduced Reliability of 3/18/88 All holders of OLs
Steam-Driven Auxiliary or CPs for nuclear
Feedwater Pumps Caused power reactors.
by Instability of Woodward
PG-PL Governors
88-08 Chemical Reactions with 3/14/88 All NRC licensees
Radioactive Waste generating or pro- Solidification Agents cessing low level
radioactive waste.
88-07 Inadvertent Transfer of 3/7/88 All NRC broad licensees
Licensed Material to and licensees authorized
Uincontrolled Locations to possess byproduct
material as sealed
sources in teletherapy
units or "self-contained"
irradiators.
88-06 Foreign Objects in Steam 2/29/88 All holders of OLs
Generators or CPs for PV!Rs.
OL = Operating License
CP = Construction Permit
IN 88-13 April 18, 1988 vibration of the valve disk. This vibration induced high enough stresses in
the fill line to cause the pipe rupture.
On February 22, 1988, while Braidwood Unit 1 was draining the "D" accumulator, the fill line ruptured at a location similar to the location of a break pre- viously reported at Byron, which was not analyzed by the licensee. The break
location was also similar to that at Trojan. This line has a Kerotest Y-pattern
packless metal diaphragm globe valve installed. Analysis of the break determined
that it was caused by high cycle fatigue. The licensee has not been able to rule
out valve "chugging" as the cause of the high cycle fatigue.
Discussion:
Reverse flow through Kerotest Y-pattern packless metal diaphragm globe valves
has caused broken piping welds at two nuclear plants and may be responsible for
other broken welds where the root cause has not been identified. Because of
the stem and disk design used in Kerotest Y-pattern packless metal diaphragm
globe valves, these valves are not intended for applications that require flow
throttling or that subject the valves to reverse flow. Reverse flow in these
valves can result in "chugging" that induces flow vibrations and water hammer.
It may not be clear to plant operating personnel that violating these appli- cation criteria can result in serious consequences such as weld cracks and
pipe ruptures that breach the primary coolant pressure boundary.
The manufacturer's product literature did not clearly state that certain valve
types should not be subjected to reverse flow or used for flow throttling. Older
issues of Kerotest instruction and engineering manuals do not warn users of the
valves' unidirectional flow properties. More recent editions have corrected this
deficiency; however, licensees may not have the corrected manual.
Purchase specifications may have been written without regard to flow direc- tionality because the manufacturer's literature did not note its importance.
This may have caused the improper use of these valves in applications where
bi-directional flow is anticipated either in normal operation or in coping
with emergency situations that require other-than-normal plant lineups.
No specific action or written response is required by this information notice.
If you have any questions about this matter, please contact the technical
contact listed below or the Regional Administrator of the appropriate regional
office.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Rudy 0. Karsch, NRR
(301) 492-1178 Attachment: List of Recently Issued NRC Information Notices
EAB:NRR* EAB:NRR* C:EAB:NRR* Tech:Ed* C:OGCB:NRR* A 4 i.
RKarsch:db RLobel WLanning AThomas CBerlinger
3/4/88 3/11/88 3/22/88 3/31/88 4/8/88 4// /88
IN 88-XX
April XX, 1988 No specific action or written response is required by this information
notice. If you have any questions about this matter, please contact the
technical contact listed below or the Regional Administrator of the
appropriate regional office.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Rudy 0. Karsch, NRR
(301) 492-1178 Attachment: List of Recently Issued NRC Information Notices
Cii44 EAB:NRR* EAB: NRR* C:EAB:NRR* Tech: Ed* C:OGCB:NRR
RKarsch:db RLobel WLanning AThomas CBerlinger
3/4/88 3/11/88 3/22/88 3/31/88 cl//5/88 D:DOEA:NRR
CERossi
/ /88
IN 88-XX
March XX, 1988 No specific action or written response is required by this information
notice. If you have any questions about this matter, please contact the
technical contact listed below or the Regional Administrator of the
appropriate regional office.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Rudy 0. Karsch, NRR
(301) 492-1178 Attachment: List of Recently Issued NRC Information Notices
DISTRIBUTION
CERossi
EAB r/f
WLanning
RLobel
RKarsch r/f
Central File
EAB:NRR C: 6RR Tech:Edffr C:OGCB:NRR
RR a c:db RLobel WI ining AThomas'W CBerlinger
~3 /4 /88 3 /t(/88 3 /tV/88 5/f/i88 / /88 D:DOEA:NRR
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list | - Information Notice 1988-01, Safety Injection Pipe Failure (27 January 1988, Topic: Unidentified leak, Water hammer)
- Information Notice 1988-03, Cracks in Shroud Support Access Hole Cover Welds (2 February 1988, Topic: Stolen)
- Information Notice 1988-04, Inadequate Qualification and Documentation of Fire Barrier Penetration Seals (5 February 1988, Topic: Fire Barrier, Fire Watch, Stolen)
- Information Notice 1988-05, Fire in Annunciator Control Cabinets (12 February 1988, Topic: Stolen)
- Information Notice 1988-06, Foreign Objects in Steam Generators (29 February 1988, Topic: Stolen)
- Information Notice 1988-07, Inadvertent Transfer of Licensed Material to Uncontrolled Locations (7 March 1988, Topic: Stolen)
- Information Notice 1988-08, Chemical Reactions with Radioactive Waste Solification Agents (14 March 1988, Topic: Process Control Program, Stolen)
- Information Notice 1988-09, Reduced Reliability of Steam-Driven Auxiliary Feedwater Pumps Caused by Instability of Woodward PG-PL Type Governors (18 March 1988)
- Information Notice 1988-10, Memo of Understanding Between NRC and OSHA Relating to NRC-Licensed Facilities (53 FR 43950, October 31, 1988) (23 December 1988)
- Information Notice 1988-10, Memo of Understanding Between NRC and OSHA Relating to NRC-Licensed Facilities (53 Fr 43950, October 31, 1988) (23 December 1988, Topic: Fatality, Overexposure)
- Information Notice 1988-10, Memorandum of Understanding Between NRC and Osha Relating to NRC-Licensed Facilities (53 Fr 43950, October 31, 1988. (23 December 1988, Topic: Fatality, Overexposure)
- Information Notice 1988-11, Potential Loss of Motor Control Center And/Or Switchboard Function Due to Faulty Tie Bolts (7 April 1988)
- Information Notice 1988-12, Overgreasing of Electric Motor Bearings (12 April 1988)
- Information Notice 1988-13, Water Hammer & Possible Piping Damage Caused by Misapplication of Kerotest Packless Metal Diaphragm Globe Valves (18 April 1988)
- Information Notice 1988-14, Potential Problems with Electrical Relays (18 April 1988)
- Information Notice 1988-15, Availability of Us Food & Drug Administration (FDA) Approved Potassium Iodide for Use in Emergencies Involving Radioactive Iodine (18 April 1988)
- Information Notice 1988-15, Availability of Us Food & Drug Administration (Fda) Approved Potassium Iodide for Use in Emergencies Involving Radioactive Iodine (18 April 1988)
- Information Notice 1988-16, Identify Waste Generators in Shipments of Low-Level Waste to Land Disposal Facilities (22 April 1988, Topic: Water hammer)
- Information Notice 1988-17, Summary of Responses to NRC Bulletin 87-01, Thinning of Pipe Walls in Nuclear Power Plants. (22 April 1988, Topic: Safe Shutdown, Weld Overlay, Feedwater Heater, Through-Wall Leak, Water hammer)
- Information Notice 1988-18, Malfunction of Lockbox on Radiography Device (25 April 1988, Topic: Overexposure)
- Information Notice 1988-19, Questionable Certification of Class Ie Components (26 April 1988, Topic: Water hammer)
- Information Notice 1988-19, Questionable Certification of Class IE Components (26 April 1988)
- Information Notice 1988-20, Unauthorized Individuals Manipulating Controls and Performing Control Room Activities (5 May 1988)
- Information Notice 1988-21, Inadvertent Criticality Events at Oskarshamn and at U.S. Nuclear Power Plants (9 May 1988, Topic: Shutdown Margin)
- Information Notice 1988-22, Disposal of Sludge from Onsite Sewage Treatment Facilities at Nuclear Power Stations (12 May 1988)
- Information Notice 1988-23, Potential for Gas Binding of High-Pressure Safety Injection Pumps During a Loss-Of-Coolant Accident (12 May 1988)
- Information Notice 1988-24, Failures of Air-Operated Valves Affecting Safety-Related Systems (13 May 1988)
- Information Notice 1988-25, Minimum Edge Distance for Expansion Anchor Bolts (16 May 1988, Topic: Earthquake)
- Information Notice 1988-26, Falsified Pre-Employment Screening Records (16 May 1988)
- Information Notice 1988-27, Deficient Electrical Terminations Identified in Safety-Related Components (18 May 1988)
- Information Notice 1988-28, Potential for Loss of Post-Loca Recirculation Capability Due to Insulation Debris Blockage (19 May 1988, Topic: Coatings)
- Information Notice 1988-29, Deficiencies in Primary Containment Low-Voltage Electrical Penetration Assemblies (24 May 1988)
- Information Notice 1988-30, Target Rock Two-State SRV Setpoint Drift Update (25 May 1988)
- Information Notice 1988-31, Steam Generator Tube Rupture Analysis Deficiency (25 May 1988)
- Information Notice 1988-32, Prompt Reporting to NRC of Significant Incidents Involving Radioactive Material (25 May 1988)
- Information Notice 1988-33, Recent Problems Involving the Model Spec 2-T Radiographic Exposure Device (27 May 1988)
- Information Notice 1988-34, Nuclear Material Control & Accountability of Non-Fuel Special Nuclear Material at Power Reactors (31 May 1988)
- Information Notice 1988-36, Possible Sudden Loss of RCS Inventory During Low Coolant Level Operation (8 June 1988)
- Information Notice 1988-37, Flow Blockage of Cooling Water to Safety System Components (14 June 1988, Topic: Ultimate heat sink)
- Information Notice 1988-38, Failure of Undervoltage Trip Attachment of General Electric Circuit Breakers (15 June 1988)
- Information Notice 1988-39, Loss of Recirculation Pumps with Power Oscillation Event (15 June 1988)
- Information Notice 1988-40, Examiners' Handbook for Developing Operator Licensing Examinations (22 June 1988)
- Information Notice 1988-41, Physical Protection Weaknesses Identified Through Regulatory Effectiveness Reviews (RERs) (22 June 1988)
- Information Notice 1988-41, Physical Protection Weaknesses Identified Through Regulatory Effectiveness Reviews (Rers) (22 June 1988)
- Information Notice 1988-42, Circuit Breaker Failures Due to Loose Charging Spring Motor Mounting Bolts (23 June 1988, Topic: Loctite)
- Information Notice 1988-43, Solenoid Valve Problems (23 June 1988, Topic: Stroke time)
- Information Notice 1988-44, Mechanical Binding of Spring Release Device in Westinghouse Type DS-416 Circuit Breakers (24 June 1988)
- Information Notice 1988-45, Problems in Protective Relay & Circuit Breaker Coordination (7 July 1988, Topic: Safe Shutdown)
- Information Notice 1988-46, Licensee Report of Defective Refurbished Circuit Breakers (8 July 1988)
- Information Notice 1988-47, Slower-than-Expected Rod-drop Times (14 July 1988)
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