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| | issue date = 12/21/1993 | | | issue date = 12/21/1993 |
| | title = Undervoltage Relay & Thermal Overload Setpoint Problems | | | title = Undervoltage Relay & Thermal Overload Setpoint Problems |
| | author name = Grimes B K | | | author name = Grimes B |
| | author affiliation = NRC/NRR | | | author affiliation = NRC/NRR |
| | addressee name = | | | addressee name = |
Line 14: |
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| | page count = 12 | | | page count = 12 |
| }} | | }} |
| {{#Wiki_filter:UNITED STATES NUCLEAR REGULATORY | | {{#Wiki_filter:UNITED STATES |
|
| |
|
| COMMISSION | | NUCLEAR REGULATORY COMMISSION |
|
| |
|
| ===OFFICE OF NUCLEAR REACTOR REGULATION===
| | OFFICE OF NUCLEAR REACTOR REGULATION |
| WASHINGTON, D.C. 20555 December 21, 1993 NRC INFORMATION
| |
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| |
|
| NOTICE 93-99: UNDERVOLTAGE | | WASHINGTON, D.C. 20555 December 21, 1993 NRC INFORMATION NOTICE 93-99: UNDERVOLTAGE RELAY AND THERMAL OVERLOAD |
|
| |
|
| RELAY AND THERMAL OVERLOAD SETPOINT PROBLEMS
| | SETPOINT PROBLEMS |
|
| |
|
| ==Addressees== | | ==Addressees== |
| All holders of operating | | All holders of operating licenses or construction permits for nuclear power |
|
| |
|
| licenses or construction
| | plants. |
| | |
| permits for nuclear power plants.
| |
|
| |
|
| ==Purpose== | | ==Purpose== |
| The U.S. Nuclear Regulatory | | The U.S. Nuclear Regulatory Commission (NRC) is issuing this information |
|
| |
|
| Commission (NRC) is issuing this information
| | notice to alert addressees to continuing discoveries of undervoltage relay and |
|
| |
|
| notice to alert addressees
| | thermal overload setpoints that are set too low. It is expected that |
|
| |
|
| to continuing | | recipients will review the information for applicability to their facilities |
|
| |
|
| discoveries
| | 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. |
|
| |
|
| of undervoltage
| | Background |
|
| |
|
| relay and thermal overload setpoints
| | In August 1976, the NRC wrote generic letters to all LWR licensees regarding |
|
| |
|
| that are set too low. It is expected that recipients
| | the need for licensees to evaluate any generic implications of several events |
|
| |
|
| will review the information
| | at the Millstone site involving episodes of sustained degraded grid voltage. |
|
| |
|
| for applicability
| | On June 2, 1977, as part of multiplant action MPA-23, the staff stated its |
|
| |
|
| to their facilities
| | position that all licensees must have a second level of undervoltage |
|
| |
|
| and consider actions, as appropriate, to avoid similar problems. | | protection with a time delay. (During degraded grid voltage episodes, undervoltage relays and thermal overload protective relays protect the safety |
|
| |
|
| However, suggestions
| | equipment.) In a generic letter dated August 8, 1979, the NRC requested all |
|
| |
|
| contained
| | licensees to determine the capability of the offsite power system to operate |
|
| |
|
| in this Information
| | all required loads within their voltage ratings under all conditions within |
|
| |
|
| notice are not NRC requirements;
| | their design basis. The licensees reviewed their undervoltage relay setpoints |
| therefore, no specific action or written response is required.Background
| |
|
| |
|
| In August 1976, the NRC wrote generic letters to all LWR licensees | | on each of these occasions. In 1981, the NRC issued Branch Technical |
|
| |
|
| regarding the need for licensees
| | Position, Power System Branch-1, "Adequacy of Station Electric Distribution |
|
| |
|
| to evaluate any generic implications
| | System Voltages," which discussed, among other things, the addition of a |
|
| |
|
| of several events at the Millstone
| | second undervoltage relay with an associated time delay. Between 1981 and |
|
| |
|
| site involving
| | 1992, the NRC issued two information notices, in which it discussed |
|
| |
|
| episodes of sustained
| | undervoltage relay setpoints and other concerns: |
| | 1. IN 84-02, "Operating a Nuclear Power Plant at Voltage |
|
| |
|
| degraded grid voltage.On June 2, 1977, as part of multiplant
| | Levels Lower than Analyzed," issued January 10, 1984. |
|
| |
|
| action MPA-23, the staff stated its position that all licensees
| | 2. IN 91-29, "Deficiencies Identified During Electrical Distribution |
|
| |
|
| must have a second level of undervoltage
| | System Functional Inspections," issued April 15, 1991. |
|
| |
|
| protection
| | 9312150073 PDR E No4tEC 93-0 1 e ' , t |
|
| |
|
| with a time delay. (During degraded grid voltage episodes, undervoltage
| | IN 93-99 December 21, 1993 3. IN 91-29, Supplement 1, TDeficiencies Identified During |
|
| |
|
| relays and thermal overload protective
| | -- 93-99 |
| | "VIN |
|
| |
|
| relays protect the safety equipment.)
| | December 21, 1993 This information notice requires no specific action or written response. If |
| In a generic letter dated August 8, 1979, the NRC requested
| |
|
| |
|
| all licensees
| | you have any questions about the information in this notice, please contact |
|
| |
|
| to determine
| | the technical contact listed below or the appropriate Office of Nuclear |
|
| |
|
| the capability
| | Reactor Regulation (NRR) project manager. |
|
| |
|
| of the offsite power system to operate all required loads within their voltage ratings under all conditions
| | Bran K. rimes, Director |
|
| |
|
| within their design basis. The licensees
| | Division of Operating Reactor Support |
|
| |
|
| reviewed their undervoltage
| | Office of Nuclear Reactor Regulation |
|
| |
|
| relay setpoints on each of these occasions.
| | Technical contact: C. Morris, NRR |
|
| |
|
| In 1981, the NRC issued Branch Technical Position, Power System Branch-1, "Adequacy
| | (301) 504-2778 Attachments: |
| | 1. Representative List of Undervoltage |
|
| |
|
| of Station Electric Distribution | | Relay Setpoint Revisions 1988-1993 |
| | 2. List of Recently Issued NRC Information Notices |
|
| |
|
| System Voltages," which discussed, among other things, the addition of a second undervoltage
| | Attachment 1 IN 93-99 December 21, 1993 Representative List of Undervoltaqe Relay Set Point Revision Notifications and |
|
| |
|
| relay with an associated
| | Technical Specification Change Proposals for 1988-1993 Event Notification Licensee Event Notification Date |
|
| |
|
| time delay. Between 1981 and 1992, the NRC issued two information
| | Number |
|
| |
|
| notices, in which it discussed undervoltage
| | 11374 Pilgrim 1 January 30, 1988 1 |
| | 14043 Pilgrim 1 November 18, 1988 5 |
| | 00000 Pilgrim 1 June 30, 1988 1 |
| | 14780 Cooper 1 February 17, 1989 5 |
| | 16540 Crystal River 3 September 8, 1989 1 |
| | 17121 Robinson 2 November 16, 1989 1 |
| | 18322 Oconee 1, 2 and 3 April 24, 1990 5 |
| | 18466 McGuire 1 and 2 May 14, 1990 1 |
| | 18892 St. Lucie 2 July 14, 1990 2 |
| | 19023 Haddam Neck 1 August 2, 1990 5 |
| | 20021 Calvert Cliff 1 and 2 December 6, 1990 1 |
| | 20435 Ft. Calhoun February 12, 1991 1 |
| | 20503 Kewaunee 1 February 20, 1991 5 |
| | 20542 Salem 2 February 27, 1991 2 |
| | 21691 Dresden 2 and 3 August 23, 1991 5 |
| | 22281 Dresden 2 November 20, 1991 1 |
| | 22498 Zion 1 and 2 December 19, 1991 5 |
| | 22580 Indian Point 3 January 9, 1992 |
| | 22658 Dresden 3 January 22, 1992 |
| | 22847 (TOL) Washington Nuclear 2 February 19, 1992 |
| | 22918 Washington Nuclear 2 March 1, 1992 |
| | 23148 Vermont Yankee April 1, 1992 |
| | 23191 Quad Cities 1 and 2 April 7, 1992 |
| | 23338 LaSalle 1 and 2 April 27, 1992 |
| | 23365 LaSalle 2 April 29, 1992 |
| | 23385 Crystal River 3 May 1, 1992 |
| | 23439 (TOL) Grand Gulf May 11, 1992 |
| | 23452 Comanche Peak 2 May 13, 1992 |
| | 23576 Crystal River 3 June 4, 1992 |
| | 23784 Zion 1 and 2 July 2, 1992 |
| | 23932 Byron 1 and 2 July 24, 1992 |
| | 00000 Callaway July 23, 1992 |
| | 24229 Crystal River 3 September 14, 1992 |
| | 24384 Dresden 2 and 3 October 6, 1992 |
| | *TOL - Thermal Overload |
|
| |
|
| relay setpoints
| | Attachment 1 IN 93-99 December 21, 1993 Event Notification Licensee Event Notification Date Class |
|
| |
|
| and other concerns: 1. IN 84-02, "Operating
| | Number |
|
| |
|
| a Nuclear Power Plant at Voltage Levels Lower than Analyzed," issued January 10, 1984.2. IN 91-29, "Deficiencies
| | 00000 Prairie Island 1 & 2 November 6, 1992 1 |
| | 00000 St. Lucie 1 November 30, 1992 1 |
| | 24757 Maine Yankee December 15, 1992 5 |
| | 00000 Diablo Canyon 1 and 2 December 22, 1992 1 |
| | 24845 Point Beach 1 and 2 January 7, 1993 1 |
| | 25248 (TOL) Pilgrim March 29, 1993 5 |
| | 25362 South Texas April 6, 1993 5 Events Notification Number-00000 Licensees whose undervoltage relay setpoint |
|
| |
|
| Identified
| | notifications to the NRC were reported by LERs, licensee letter, etc., and |
|
| |
|
| During Electrical
| | event notification numbers if any, were not known. |
|
| |
|
| ===Distribution===
| | Class Definitions: |
| System Functional
| | 1. Undervoltage Relay setpoints were found to be incorrect because of |
|
| |
|
| Inspections," issued April 15, 1991.9312150073 PDR E No4tEC 93-0 1 e ' , t
| | design errors. |
|
| |
|
| IN 93-99 December 21, 1993 3. IN 91-29, Supplement
| | 2. Undervoltage Relay setpoints, as found, were not the same as required by |
|
| |
|
| 1, TDeficiencies
| | the technical specification. |
|
| |
|
| Identified
| | 3. Safety load circuit breaker thermal overloads or other trip setpoints |
|
| |
|
| During
| | were too low because of design errors. |
|
| |
|
| --"VIN 93-99 December 21, 1993 This information
| | 4. Safety load circuit breaker thermal overload, or other trip setpoints, as found, were not the same as required by the technical specification. |
|
| |
|
| notice requires no specific action or written response.
| | 5. Membership in one of the preceding four classes could not be definitely |
|
| |
|
| If you have any questions
| | established because of incomplete information in the event notification. |
|
| |
|
| about the information
| | Att~ehment 2 IN 93-99 December 21, 1993 LIST OF RECENTLY ISSUED |
|
| |
|
| in this notice, please contact the technical
| | NRC INFORMATION NOTICES |
|
| |
|
| contact listed below or the appropriate
| | Information Date of |
|
| |
|
| Office of Nuclear Reactor Regulation (NRR) project manager.Bran K. rimes, Director Division of Operating
| | Notice No. Subject Issuance Issued to |
|
| |
|
| ===Reactor Support Office of Nuclear Reactor Regulation===
| | 93-98 Motor Brakes on Valve 12/20/93 All holders of OLs and CPs |
| Technical
| |
|
| |
|
| contact: C. Morris, NRR (301) 504-2778 Attachments:
| | Actuator Motors for nuclear power reactors. |
| 1. Representative
| |
|
| |
|
| ===List of Undervoltage===
| | 93-97 Failures of Yokes 12/17/93 All holders of OLs or CPs |
| Relay Setpoint Revisions
| |
|
| |
|
| 1988-1993 2. List of Recently Issued NRC Information
| | Installed on Walworth for nuclear power reactors. |
|
| |
|
| Notices
| | Gate and Globe Valves |
|
| |
|
| Attachment
| | 93-96 Improper Reset Causes 12/14/93 All holders of OLs or CPs |
|
| |
|
| 1 IN 93-99 December 21, 1993 Representative
| | Emergency Diesel for nuclear power reactors. |
|
| |
|
| List of Undervoltaqe
| | Generator Failures |
|
| |
|
| Relay Set Point Revision Notifications
| | 93-95 Storm-Related Loss of 12/13/93 All holders of OLs or CPs |
|
| |
|
| and Technical
| | Offsite Power Events for nuclear power reactors |
|
| |
|
| Specification
| | due to Salt Buildup located close to a large |
|
| |
|
| Change Proposals
| | on Switchyard Insulators body of salt water. |
|
| |
|
| for 1988-1993 Event Notification
| | 93-94 Unauthorized Forced 12/09/93 All holders of OLs or CPs |
|
| |
|
| Number Licensee Event Notification
| | Entry into the Pro- for nuclear power reactors. |
|
| |
|
| Date 11374 14043 00000 14780 16540 17121 Pilgrim Pilgrim Pilgrim 1 1 1 January 30, 1988 November 18, 1988 June 30, 1988 1 5 1 Cooper 1 Crystal River 3 Robinson 2 February 17, September
| | tected Area at Three |
|
| |
|
| 8, November 16, 1989 1989 1989 5 1 1 18322 18466 18892 19023 20021 Oconee 1, 2 and 3 McGuire 1 and 2 St. Lucie 2 Haddam Neck 1 Calvert Cliff 1 and 2 Ft. Calhoun Kewaunee 1 Salem 2 Dresden 2 and 3 Dresden 2 Zion 1 and 2 April 24, 1990 May 14, 1990 July 14, 1990 August 2, 1990 December 6, 1990 February 12, 1991 February 20, 1991 February 27, 1991 August 23, 1991 November 20, 1991 December 19, 1991 5 1 2 5 1 20435 20503 20542 21691 22281 22498 1 5 2 5 1 5 22580 22658 22847 (TOL)22918 23148 23191 23338 23365 23385 23439 (TOL)23452 23576 23784 23932 00000 24229 24384 Indian Point 3 Dresden 3 Washington
| | Mile Island Unit 1 on |
|
| |
|
| Nuclear 2 Washington
| | February 7, 1993 |
| | 93-93 Inadequate Control of 12/08/93 All holders of OLs or CPs |
|
| |
|
| Nuclear 2 Vermont Yankee Quad Cities 1 and 2 LaSalle 1 and 2 LaSalle 2 Crystal River 3 Grand Gulf Comanche Peak 2 Crystal River 3 Zion 1 and 2 Byron 1 and 2 Callaway Crystal River 3 Dresden 2 and 3 January 9, 1992 January 22, 1992 February 19, 1992 March 1, 1992 April 1, 1992 April 7, 1992 April 27, 1992 April 29, 1992 May 1, 1992 May 11, 1992 May 13, 1992 June 4, 1992 July 2, 1992 July 24, 1992 July 23, 1992 September
| | Reactor Coolant System for nuclear power reactors. |
|
| |
|
| 14, 1992 October 6, 1992*TOL -Thermal Overload
| | Conditions During Shutdown |
|
| |
|
| Attachment
| | 93-92 Plant Improvements to 12/07/93 All holders of OLs or CPs |
|
| |
|
| 1 IN 93-99 December 21, 1993 Event Notification
| | Mitigate Common Depend- for nuclear power reactors. |
|
| |
|
| Licensee Event Notification
| | encies in Component |
|
| |
|
| Date Class Number 00000 Prairie Island 1 & 2 November 6, 1992 1 00000 St. Lucie 1 November 30, 1992 1 24757 Maine Yankee December 15, 1992 5 00000 Diablo Canyon 1 and 2 December 22, 1992 1 24845 Point Beach 1 and 2 January 7, 1993 1 25248 (TOL) Pilgrim March 29, 1993 5 25362 South Texas April 6, 1993 5 Events Notification
| | Cooling Water Systems |
|
| |
|
| Number-00000
| | 91-21, Inadequate Quality 12/07/93 All holders of OLs or CPs |
| Licensees
| |
|
| |
|
| whose undervoltage
| | Supp. 1 Assurance Program of for nuclear power reactors |
|
| |
|
| relay setpoint notifications
| | Vendor Supplying and all recipients of |
|
| |
|
| to the NRC were reported by LERs, licensee letter, etc., and event notification
| | Safety-Related Equipment NUREG-0040, 'License Con- tractor and Vendor Inspec- tion Status ReportR (White |
|
| |
|
| numbers if any, were not known.Class Definitions:
| | Book).. |
| 1. Undervoltage
| |
|
| |
|
| Relay setpoints
| | OL - Operating License |
|
| |
|
| were found to be incorrect
| | CP = Construction Permit |
|
| |
|
| because of design errors.2. Undervoltage
| | IN 93-99 December 21, 1993 This information notice requires no specific action or written response. If |
|
| |
|
| Relay setpoints, as found, were not the same as required by the technical
| | you have any questions about the information in this notice, please contact |
|
| |
|
| specification.
| | the technical contact listed below or the appropriate Office of Nuclear |
|
| |
|
| 3. Safety load circuit breaker thermal overloads
| | Reactor Regulation (NRR) project manager. |
|
| |
|
| or other trip setpoints were too low because of design errors.4. Safety load circuit breaker thermal overload, or other trip setpoints, as found, were not the same as required by the technical
| | Odginal signed by |
|
| |
|
| specification.
| | Brian K.Grimes |
|
| |
|
| 5. Membership
| | Brian K. Grimes, Director |
|
| |
|
| in one of the preceding
| | Division of Operating Reactor Support |
|
| |
|
| four classes could not be definitely
| | Office of Nuclear Reactor Regulation |
|
| |
|
| established
| | Technical contact: C. Morris, NRR |
|
| |
|
| because of incomplete
| | (301) 504-2778 Attachments: |
| | 1. Representative List of Undervoltage |
|
| |
|
| information
| | Relay Setpoint Revisions 1988-1993 |
| | 2. List of Recently Issued NRC Information Notices |
|
| |
|
| in the event notification.
| | E plion: |
| | The stress laid by the initial reviewer on the degree of concern that |
|
| |
|
| Att~ehment
| | licensees and the staff should feel for such a widespread and persistent |
|
| |
|
| 2 IN 93-99 December 21, 1993 LIST OF RECENTLY ISSUED NRC INFORMATION
| | preblem, viz. low UVR set points, has been all but eliminated from the |
|
| |
|
| NOTICES Information
| | present IN. |
|
| |
|
| Date of Notice No. Subject Issuance Issued to 93-98 93-97 93-96 93-95 93-94 93-93 Motor Brakes on Valve Actuator Motors Failures of Yokes Installed
| | *C.MORRIS (S/D) (SEE PREVIOUS CONC.) |
| | 15 NOV. 93 |
| | *SEE PREVIOUS CONCURRENCES |
|
| |
|
| on Walworth Gate and Globe Valves Improper Reset Causes Emergency
| | *DO RS/OGCB |
|
| |
|
| Diesel Generator
| | * C/OGCB:DORS:NRR D/DORS:NRR |
|
| |
|
| Failures Storm-Related
| | NCampbell GHMarcus |
|
| |
|
| Loss of Offsite Power Events due to Salt Buildup on Switchyard
| | 07/30/93 08/10/93 12//$193 |
| | *EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *D/DE: NRR *RPB:ADM |
|
| |
|
| Insulators
| | CMorris EWWeiss CHBerlinger JTWiggins Tech Ed |
|
| |
|
| Unauthorized
| | 04/28/93 95/19/93 05/19/93 07/23/93 07/13/93 |
| | # Concurred in electronically by JMain. |
|
| |
|
| Forced Entry into the Pro-tected Area at Three Mile Island Unit 1 on February 7, 1993 Inadequate
| | DOC NAME: 93-99.IN |
|
| |
|
| Control of Reactor Coolant System Conditions
| | IN 93-XX |
|
| |
|
| During Shutdown Plant Improvements
| | November XX, 1993 This information notice requires no specific action or written response. If |
|
| |
|
| to Mitigate Common Depend-encies in Component Cooling Water Systems Inadequate
| | you have any questions about the information in this notice, please contact |
|
| |
|
| Quality Assurance
| | the technical contact listed below or the appropriate Office of Nuclear |
|
| |
|
| Program of Vendor Supplying Safety-Related
| | Reactor Regulation (NRR) project manager. |
|
| |
|
| Equipment 12/20/93 12/17/93 12/14/93 12/13/93 12/09/93 12/08/93 12/07/93 12/07/93 All holders of OLs and CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors located close to a large body of salt water.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors and all recipients
| | Brian K. Grimes, Director |
|
| |
|
| of NUREG-0040, 'License Con-tractor and Vendor Inspec-tion Status ReportR (White Book)..93-92 91-21, Supp. 1 OL -Operating | | Division of Operating Reactor Support |
|
| |
|
| License CP = Construction
| | Office of Nuclear Reactor Regulation |
|
| |
|
| Permit
| | Technical contact: C. Morris, NRR |
|
| |
|
| IN 93-99 December 21, 1993 This information
| | (301) 504-2778 Attachments: |
| | 1. Representative List of Undervoltage |
|
| |
|
| notice requires no specific action or written response.
| | Relay Setpoint Revisions 1988-1993 |
| | 2. List of Recently Issued NRC Information Notices |
|
| |
|
| If you have any questions
| | Exception: |
| | The stress laid by the initial reviewer on the degree of concern that |
|
| |
|
| about the information
| | licensees and the staff should feel for such a widespread and persistent |
|
| |
|
| in this notice, please contact the technical
| | problem, viz. low UVR set points, has been all but eliminated from the |
|
| |
|
| contact listed below or the appropriate
| | present IN. G4' |
| | C.MORRIS |
|
| |
|
| Office of Nuclear Reactor Regulation (NRR) project manager.Odginal signed by Brian K. Grimes Brian K. Grimes, Director Division of Operating
| | 15 NOV. 93 Document Name: G:\SHARED\R3UNRELS.IN |
|
| |
|
| ===Reactor Support Office of Nuclear Reactor Regulation===
| | *SEE PREVIOUS CONCURRENCES # Concurred in electronically by JMain. |
| Technical
| |
|
| |
|
| contact: C. Morris, NRR (301) 504-2778 Attachments:
| | D/DORS:NRR *C/OGCB: DORS:NRR *OGCB:DORS:NRR |
| 1. Representative
| |
|
| |
|
| ===List of Undervoltage===
| | BKGrimes GHMarcus NCampbell |
| Relay Setpoint Revisions
| |
|
| |
|
| 1988-1993 2. List of Recently Issued NRC Information
| | 11/ /93 A 08/10/93 07/30/93 |
| | *EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *D/DE:NRR *RPB:ADM |
|
| |
|
| Notices E plion: The stress laid by the initial reviewer on the licensees
| | CMorris EWWeiss CHBerlinger JTWiggins Tech Ed |
|
| |
|
| and the staff should feel for such a preblem, viz. low UVR set points, has been all present IN.degree of concern that widespread
| | 04/28/93 05/19/93 05/19/93 07/23/93 07/13/93 |
| | &Wp: 4 & Lso1 |
|
| |
|
| and persistent
| | IN 93-XX |
|
| |
|
| but eliminated
| | November XX, 1993 This information notice requires no specific action or written response. If |
|
| |
|
| from the (SEE PREVIOUS CONC.)*C.MORRIS 15 NOV. 93 (S/D)*SEE PREVIOUS CONCURRENCES
| | you have any questions about the information in this notice, please contact |
|
| |
|
| *DO RS/OGCB
| | the technical contact listed below or the appropriate Office of Nuclear |
|
| |
|
| * C/OGCB:DORS:NRR
| | Reactor Regulation (NRR) project manager. |
|
| |
|
| D/DORS:NRR
| | Brian K. Grimes, Director |
|
| |
|
| NCampbell
| | Division of Operating Reactor Support |
|
| |
|
| GHMarcus 07/30/93 08/10/93 12//$193*EELB:DE:NRR
| | Office of Nuclear Reactor Regulation |
|
| |
|
| CMorris 04/28/93*SC/EELB:DE:NRR
| | Technical contact: C. Morris, NRR |
|
| |
|
| EWWeiss 95/19/93*C/EELB:DE:NRR
| | (301) 504-2778 Attachments: |
| | 1. Representative List of Undervoltage |
|
| |
|
| CHBerlinger
| | Relay Setpoint Revisions 1988-1993 |
| | 2. List of Recently Issued NRC Information Notices |
|
| |
|
| 05/19/93*D/DE: NRR JTWiggins 07/23/93*RPB:ADM Tech Ed 07/13/93# Concurred
| | Document Name: G:\SHARED\R3UNRELS.IN |
|
| |
|
| in electronically | | *SEE PREVIOUS CONCURRENCES # Concurred in electronically by JMain. |
|
| |
|
| by JMain.DOC NAME: 93-99.IN
| | D/DORS:NRR *C/OGCB:DWRS:NRR *OGCB: DORS:NRR |
|
| |
|
| IN 93-XX November XX, 1993 This information
| | BKGrimes GHMarcus NCampbell |
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| notice requires no specific action or written response.
| | ll/ /93 08/10/93 07/30/93 |
| | *EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *D/DE:NRR *RPB:ADM |
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| If you have any questions
| | CMorris EWWeiss CHBerlinger JTWiggins Tech Ed |
|
| |
|
| about the information
| | 04/28/93 05/19/93 05/19/93 07/23/93 07/13/93 |
|
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| in this notice, please contact the technical
| | IN 93-XX |
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| |
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| contact listed below or the appropriate
| | August XX, 1993 This information notice requires no specific action or written response. If |
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| Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
| | you have any questions about the information in this notice, please contact |
|
| |
|
| ===Reactor Support Office of Nuclear Reactor Regulation===
| | the technical contact listed below or the appropriate Office of Nuclear |
| Technical
| |
|
| |
|
| contact: C. Morris, NRR (301) 504-2778 Attachments:
| | Reactor Regulation (NRR) project manager. |
| 1. Representative
| |
|
| |
|
| ===List of Undervoltage===
| | Brian K. Grimes, Director |
| Relay Setpoint Revisions
| |
|
| |
|
| 1988-1993 2. List of Recently Issued NRC Information
| | Division of Operating Reactor Support |
|
| |
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| Notices Exception:
| | Office of Nuclear Reactor Regulation |
| The stress laid by the initial reviewer on the degree of concern that licensees
| |
| | |
| and the staff should feel for such a widespread
| |
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| and persistent
| | Technical contact: C. Morris, NRR |
|
| |
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| problem, viz. low UVR set points, has been all but eliminated
| | (301) 504-2778 Attachments: |
| | 1. Representative List of Undervoltage |
|
| |
|
| from the present IN. G4'C.MORRIS 15 NOV. 93 Document Name: G:\SHARED\R3UNRELS.IN
| | Relay Setpoint Revisions 1988-1993 |
| | 2. List of Recently Issued NRC Information Notices |
|
| |
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| *SEE PREVIOUS CONCURRENCES | | *SEE PREVIOUS CONCURRENCES |
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| # Concurred
| | Document Name: UNRELSET.IN DORS/OGCB D/DORS: C/OGCB: DORS:NRR |
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| in electronically
| | NCampbell BKGrime GHMarcus6#/W |
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| by D/DORS:NRR
| | 07/30/93 08/ /93 08/to /93 |
| | *EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *D/DE :NRR *RPB:ADM |
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| *C/OGCB: DORS:NRR BKGrimes GHMarcus 11/ /93 A 08/10/93*C/EELB:DE:NRR
| | CMorris EWWeiss CHBerlinger JTWiggins Tech Ed |
|
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| *D/DE:NRR CHBerlinger
| | 04/28/93 05/19/93 05/19/93 07/23/93 07/13/93 |
| | # Concurred in electronically by JMain. |
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| JTWiggins 05/19/93 07/23/93 JMain.*OGCB:DORS:NRR
| | IN 93-XX |
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| |
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| NCampbell 07/30/93*RPB:ADM Tech Ed 07/13/93*EELB:DE:NRR
| | August XX, 1993 This information notice requires no specific action or written response. If |
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| CMorris 04/28/93*SC/EELB:DE:NRR
| | you have any questions about the information in this notice, please contact |
|
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| EWWeiss 05/19/93&Wp: & 4 Lso1 IN 93-XX November XX, 1993 This information
| | the technical contact listed below or the appropriate Office of Nuclear |
|
| |
|
| notice requires no specific action or written response.
| | Reactor Regulation (NRR) project manager. |
|
| |
|
| If you have any questions
| | Brian K. Grimes, Director |
|
| |
|
| about the information
| | Division of Operational Events |
|
| |
|
| in this notice, please contact the technical
| | Assessment |
|
| |
|
| contact listed below or the appropriate
| | Office of Nuclear Reactor Regulation |
|
| |
|
| Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
| | Technical contact: C. Morris, NRR |
|
| |
|
| ===Reactor Support Office of Nuclear Reactor Regulation===
| | (301) 504-2778 Attachments: |
| Technical
| | 1. Representative List of Undervoltage Relay Setpoint Revisions 1988-1993 |
| | | 2. List of Recently Issued NRC Information Notices |
| contact: C. Morris, NRR (301) 504-2778 Attachments:
| |
| 1. Representative | |
| | |
| ===List of Undervoltage===
| |
| Relay Setpoint Revisions | |
| | |
| 1988-1993 2. List of Recently Issued NRC Information | |
| | |
| Notices Document Name: G:\SHARED\R3UNRELS.IN | |
|
| |
|
| *SEE PREVIOUS CONCURRENCES | | *SEE PREVIOUS CONCURRENCES |
|
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| # Concurred
| | Document Name: UNRELSET.IN DRS/OGCB D/DORS:NRR C/OGCB:DORS:NRR |
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| in D/DORS:NRR
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| BKGrimes ll/ /93*C/EELB:DE:NRR
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| CHBerlinger
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| 05/19/93 electronically
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| by*C/OGCB:DWRS:NRR
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| GHMarcus 08/10/93*D/DE:NRR JTWiggins 07/23/93 JMain.*OGCB: DORS:NRR NCampbell 07/30/93*RPB:ADM Tech Ed 07/13/93*EELB:DE:NRR
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| CMorris 04/28/93*SC/EELB:DE:NRR
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| EWWeiss 05/19/93 IN 93-XX August XX, 1993 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.Brian K. Grimes, Director Division of Operating
| |
| | |
| ===Reactor Support Office of Nuclear Reactor Regulation===
| |
| Technical
| |
| | |
| contact: C. Morris, NRR (301) 504-2778 Attachments:
| |
| 1. Representative
| |
| | |
| ===List of Undervoltage===
| |
| Relay Setpoint Revisions
| |
| | |
| 1988-1993 2. List of Recently Issued NRC Information
| |
| | |
| Notices*SEE PREVIOUS CONCURRENCES
| |
| | |
| Document Name: UNRELSET.IN | |
| | |
| DORS/OGCB NCampbell 07/30/93 D/DORS: BKGrime 08/ /93 C/OGCB: DORS:NRR GHMarcus6#/W
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| 08/to /93*EELB:DE:NRR
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| CMorris 04/28/93*SC/EELB:DE:NRR
| | NCampbell BKGrimes GHMarcus |
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| EWWeiss 05/19/93*C/EELB:DE:NRR
| | 07/8* /93 07/ /93 07/ /93 |
| | *EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *D/DE:NRR *RPB:ADM |
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|
| CHBerlinger | | CMorris EWWeiss CHBerlinger JTWiggins Tech Ed |
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| 05/19/93*D/DE : NRR JTWiggins 07/23/93*RPB:ADM Tech Ed 07/13/93# Concurred | | 04/28/93 05/19/93 05/19/93 07/23/93 07/13/93 |
| | # Concurred in electronically by JMain. |
|
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| in electronically
| | _> K_> IN 93-XX |
|
| |
|
| by JMain.
| | July XX, 1993 This information notice requires no specific action or written response. If |
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|
| IN 93-XX August XX, 1993 This information
| | you have any questions about the information in this notice, please contact |
|
| |
|
| notice requires no specific action or written response.
| | the technical contact listed below or the appropriate Office of Nuclear |
|
| |
|
| If you have any questions
| | Reactor Regulation (NRR) project manager. |
|
| |
|
| about the information
| | Brian K. Grimes, Director |
|
| |
|
| in this notice, please contact the technical
| | Division of Operational Events |
|
| |
|
| contact listed below or the appropriate
| | Assessment |
|
| |
|
| Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operational
| |
|
| |
| ===Events Assessment===
| |
| Office of Nuclear Reactor Regulation | | Office of Nuclear Reactor Regulation |
|
| |
|
| Technical | | Technical contact: C. Morris, NRR |
|
| |
|
| contact: C. Morris, NRR (301) 504-2778 Attachments:
| | (301) 504-2778 Attachments: |
| 1. Representative | | 1. Representative List of Undervoltage Relay Setpoint Revisions 1988-1993 |
| | 2. List of Recently Issued NRC Information Notices |
|
| |
|
| List of Undervoltage
| | *SEE PREVIOUS CONCURRENCES |
| | |
| Relay Setpoint Revisions
| |
| | |
| 1988-1993 2. List of Recently Issued NRC Information
| |
| | |
| Notices*SEE PREVIOUS CONCURRENCES
| |
| | |
| Document Name: UNRELSET.IN
| |
| | |
| DRS/OGCB NCampbell 07/8* /93 D/DORS:NRR
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| BKGrimes 07/ /93 C/OGCB:DORS:NRR
| |
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| GHMarcus 07/ /93*EELB:DE:NRR
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| CMorris 04/28/93*SC/EELB:DE:NRR
| |
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| EWWeiss 05/19/93*C/EELB:DE:NRR
| |
| | |
| CHBerlinger
| |
| | |
| 05/19/93*D/DE:NRR JTWiggins 07/23/93*RPB:ADM Tech Ed 07/13/93# Concurred
| |
| | |
| in electronically
| |
| | |
| by JMain.
| |
| | |
| _> K_> IN 93-XX July XX, 1993 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.Brian K. Grimes, Director Division of Operational
| |
| | |
| ===Events Assessment===
| |
| Office of Nuclear Reactor Regulation
| |
| | |
| Technical
| |
| | |
| contact: C. Morris, NRR (301) 504-2778 Attachments:
| |
| 1. Representative
| |
| | |
| List of Undervoltage
| |
| | |
| Relay Setpoint Revisions
| |
| | |
| 1988-1993 2. List of Recently Issued NRC Information
| |
| | |
| Notices*SEE PREVIOUS CONCURRENCES
| |
| | |
| Document Name: UNRELSET.IN
| |
| | |
| DORS/OGCB
| |
| | |
| D NCampbell
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| BI 07/ /93 0,*C/EELB:DE:NRR
| |
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| CHBerlinger
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|
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|
| 05/19/93/DORS:NRR KGrimes 7/ /24*EELB:DE:NRR
| | Document Name: UNRELSET.IN DORS/OGCB D/DORS:NRR |
|
| |
|
| CMorris 04/28/93*SC/EELB:DE:NRR
| | NCampbell BIKGrimes Marcus |
|
| |
|
| EWWeiss 05/19/93 Marcus T/ /93*RPB:ADM Tech Ed 07/13/93# Concurred
| | 07/ /93 0,7/ /24 T/ /93 |
| | *EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *RPB:ADM |
|
| |
|
| in electronically
| | CMorris EWWeiss CHBerlinger Tech Ed |
|
| |
|
| by JMain.}} | | 04/28/93 05/19/93 05/19/93 07/13/93 |
| | # Concurred in electronically by JMain.}} |
|
| |
|
| {{Information notice-Nav}} | | {{Information notice-Nav}} |
Undervoltage Relay & Thermal Overload Setpoint ProblemsML031060586 |
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 |
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Issue date: |
12/21/1993 |
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From: |
Grimes B Office of Nuclear Reactor Regulation |
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To: |
|
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References |
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IN-93-099, NUDOCS 9312150073 |
Download: ML031060586 (12) |
|
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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 2012-13, Boraflex Degradation Surveillance Programs and Corrective Actions in the Spent Fuel Pool2012-08-10010 August 2012 Boraflex Degradation Surveillance Programs and Corrective Actions in the Spent Fuel Pool Information Notice 2012-13, Boraflex Degradation Surveillance Programs And Corrective Actions In The Spent Fuel Pool2012-08-10010 August 2012 Boraflex Degradation Surveillance Programs And Corrective Actions In The Spent Fuel Pool Information Notice 2012-11, Age Related Capacitor Degradation2012-07-23023 July 2012 Age Related Capacitor Degradation ML12031A0132012-02-0606 February 2012 U.S. Nuclear Regulatory Commission Investigation Report No. 2-2010-058, Cpn International, Inc Information Notice 2011-19, Licensee Event Reports Containing Information Pertaining to Defects to Basic Components2011-09-26026 September 2011 Licensee Event Reports Containing Information Pertaining to Defects to Basic Components Information Notice 2011-15, Steel Containment Degradation and Associated License Renewal Aging Management Issues2011-08-0101 August 2011 Steel Containment Degradation and Associated License Renewal Aging Management Issues Information Notice 2011-17, Calculation Methodologies for Operability Determinations of Gas Voids in Nuclear Power Plant Piping2011-07-26026 July 2011 Calculation Methodologies for Operability Determinations of Gas Voids in Nuclear Power Plant Piping Information Notice 2011-13, Official Exhibit - NYS000329-00-BD01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (NRC in 2011-13)2011-06-29029 June 2011 Official Exhibit - NYS000329-00-BD01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (NRC in 2011-13) Information Notice 2011-13, Official Exhibit - Nys000329-00-Bd01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (Nrc in 2011-13)2011-06-29029 June 2011 Official Exhibit - Nys000329-00-Bd01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (Nrc in 2011-13) Information Notice 2011-13, OFFICIAL EXHIBIT - NYS000329-00-BD01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (NRC in 2011-13)2011-06-29029 June 2011 OFFICIAL EXHIBIT - NYS000329-00-BD01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (NRC in 2011-13) Information Notice 2011-04, IN: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors2011-02-23023 February 2011 IN: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors Information Notice 2011-04, In: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors2011-02-23023 February 2011 In: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors Information Notice 2011-04, in: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors2011-02-23023 February 2011 in: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors Information Notice 2010-26, New England Coalition'S Motion for Leave to Reply to NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 and Entergy'S Response to the Supplement to Nec'S Petition for Commission Review of LBP-10-2010-12-30030 December 2010 New England Coalition'S Motion for Leave to Reply to NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 and Entergy'S Response to the Supplement to Nec'S Petition for Commission Review of LBP-10-19 Information Notice 2010-26, New England Coalition'S Motion for Leave to Reply to NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 and Entergy'S Response to the Supplement to Nec'S Petition for Commission Review2010-12-30030 December 2010 New England Coalition'S Motion for Leave to Reply to NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 and Entergy'S Response to the Supplement to Nec'S Petition for Commission Review of LBP-10-19 Information Notice 2010-26, 2010/12/21-NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-262010-12-21021 December 2010 2010/12/21-NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 ML13066A1872009-12-16016 December 2009 Draft NRC Information Notice 2009-xx - Underestimate of Dam Failure Frequency Used in Probabilistic Risk Assessments ML1007804482009-11-23023 November 2009 Email from Peter Bamford, NRR to Pamela Cowan, Exelon on TMI Contamination Control Event Information Notice 2009-11, NSP000059-Revised Prefiled Testimony of Northard/Petersen/Peterson-NRC Information Notice 2009-112009-07-0707 July 2009 NSP000059-Revised Prefiled Testimony of Northard/Petersen/Peterson-NRC Information Notice 2009-11 Information Notice 2009-10, Official Exhibit - NYS000019-00-BD01- NRC Information Notice 2009-10, Transformers Failures - Recent Operating Experience (Jul. 7, 2009) (NRC in 2009-10)2009-07-0707 July 2009 Official Exhibit - NYS000019-00-BD01- NRC Information Notice 2009-10, Transformers Failures - Recent Operating Experience (Jul. 7, 2009) (NRC in 2009-10) Information Notice 2009-09, Improper Flow Controller Settings Renders Injection Systems Inoperable and Surveillance Did Not Identify2009-06-19019 June 2009 Improper Flow Controller Settings Renders Injection Systems Inoperable and Surveillance Did Not Identify Information Notice 2008-12, Reactor Trip Due to Off-Site Power Fluctuation2008-07-0707 July 2008 Reactor Trip Due to Off-Site Power Fluctuation Information Notice 2008-11, Service Water System Degradation at Brunswicksteam Electric Plant Unit 12008-06-18018 June 2008 Service Water System Degradation at Brunswicksteam Electric Plant Unit 1 Information Notice 2008-04, Counterfeit Parts Supplied to Nuclear Power Plants2008-04-0707 April 2008 Counterfeit Parts Supplied to Nuclear Power Plants Information Notice 1991-09, Counterfeiting of Crane Valves2007-09-25025 September 2007 Counterfeiting of Crane Valves Information Notice 2007-28, Potential Common Cause Vulnerabilities in Essential Service Water Systems Due to Inadequate Chemistry Controls2007-09-19019 September 2007 Potential Common Cause Vulnerabilities in Essential Service Water Systems Due to Inadequate Chemistry Controls Information Notice 2007-29, Temporary Scaffolding Affects Operability of Safety-Related Equipment2007-09-17017 September 2007 Temporary Scaffolding Affects Operability of Safety-Related Equipment Information Notice 2007-14, Loss of Offsite Power and Dual-Unit Trip at Catawba Nuclear Generating Station2007-03-30030 March 2007 Loss of Offsite Power and Dual-Unit Trip at Catawba Nuclear Generating Station Information Notice 2007-06, Potential Common Cause Vulnerabilities in Essential Service Water Systems2007-02-0909 February 2007 Potential Common Cause Vulnerabilities in Essential Service Water Systems Information Notice 2007-05, Vertical Deep Draft Pump Shaft and Coupling Failures2007-02-0909 February 2007 Vertical Deep Draft Pump Shaft and Coupling Failures Information Notice 2006-31, Inadequate Fault Interrupting Rating of Breakers2006-12-26026 December 2006 Inadequate Fault Interrupting Rating of Breakers Information Notice 2006-29, Potential Common Cause Failure of Motor-operated Valves as a Result of Stem Nut Wear2006-12-14014 December 2006 Potential Common Cause Failure of Motor-operated Valves as a Result of Stem Nut Wear Information Notice 2006-29, Potential Common Cause Failure of Motor-operated Valves As a Result of Stem Nut Wear2006-12-14014 December 2006 Potential Common Cause Failure of Motor-operated Valves As a Result of Stem Nut Wear Information Notice 2006-13, E-mail from M. 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 [[: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 21, 1993 NRC INFORMATION NOTICE 93-99: UNDERVOLTAGE RELAY AND THERMAL OVERLOAD
SETPOINT PROBLEMS
Addressees
All holders of operating licenses or construction permits for nuclear power
plants.
Purpose
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information
notice to alert addressees to continuing discoveries of undervoltage relay and
thermal overload setpoints that are set too low. 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.
Background
In August 1976, the NRC wrote generic letters to all LWR licensees regarding
the need for licensees to evaluate any generic implications of several events
at the Millstone site involving episodes of sustained degraded grid voltage.
On June 2, 1977, as part of multiplant action MPA-23, the staff stated its
position that all licensees must have a second level of undervoltage
protection with a time delay. (During degraded grid voltage episodes, undervoltage relays and thermal overload protective relays protect the safety
equipment.) In a generic letter dated August 8, 1979, the NRC requested all
licensees to determine the capability of the offsite power system to operate
all required loads within their voltage ratings under all conditions within
their design basis. The licensees reviewed their undervoltage relay setpoints
on each of these occasions. In 1981, the NRC issued Branch Technical
Position, Power System Branch-1, "Adequacy of Station Electric Distribution
System Voltages," which discussed, among other things, the addition of a
second undervoltage relay with an associated time delay. Between 1981 and
1992, the NRC issued two information notices, in which it discussed
undervoltage relay setpoints and other concerns:
1. IN 84-02, "Operating a Nuclear Power Plant at Voltage
Levels Lower than Analyzed," issued January 10, 1984.
2. IN 91-29, "Deficiencies Identified During Electrical Distribution
System Functional Inspections," issued April 15, 1991.
9312150073 PDR E No4tEC 93-0 1 e ' , t
IN 93-99 December 21, 1993 3. IN 91-29, Supplement 1, TDeficiencies Identified During
-- 93-99
"VIN
December 21, 1993 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.
Bran K. rimes, Director
Division of Operating Reactor Support
Office of Nuclear Reactor Regulation
Technical contact: C. Morris, NRR
(301) 504-2778 Attachments:
1. Representative List of Undervoltage
Relay Setpoint Revisions 1988-1993
2. List of Recently Issued NRC Information Notices
Attachment 1 IN 93-99 December 21, 1993 Representative List of Undervoltaqe Relay Set Point Revision Notifications and
Technical Specification Change Proposals for 1988-1993 Event Notification Licensee Event Notification Date
Number
11374 Pilgrim 1 January 30, 1988 1
14043 Pilgrim 1 November 18, 1988 5
00000 Pilgrim 1 June 30, 1988 1
14780 Cooper 1 February 17, 1989 5
16540 Crystal River 3 September 8, 1989 1
17121 Robinson 2 November 16, 1989 1
18322 Oconee 1, 2 and 3 April 24, 1990 5
18466 McGuire 1 and 2 May 14, 1990 1
18892 St. Lucie 2 July 14, 1990 2
19023 Haddam Neck 1 August 2, 1990 5
20021 Calvert Cliff 1 and 2 December 6, 1990 1
20435 Ft. Calhoun February 12, 1991 1
20503 Kewaunee 1 February 20, 1991 5
20542 Salem 2 February 27, 1991 2
21691 Dresden 2 and 3 August 23, 1991 5
22281 Dresden 2 November 20, 1991 1
22498 Zion 1 and 2 December 19, 1991 5
22580 Indian Point 3 January 9, 1992
22658 Dresden 3 January 22, 1992
22847 (TOL) Washington Nuclear 2 February 19, 1992
22918 Washington Nuclear 2 March 1, 1992
23148 Vermont Yankee April 1, 1992
23191 Quad Cities 1 and 2 April 7, 1992
23338 LaSalle 1 and 2 April 27, 1992
23365 LaSalle 2 April 29, 1992
23385 Crystal River 3 May 1, 1992
23439 (TOL) Grand Gulf May 11, 1992
23452 Comanche Peak 2 May 13, 1992
23576 Crystal River 3 June 4, 1992
23784 Zion 1 and 2 July 2, 1992
23932 Byron 1 and 2 July 24, 1992
00000 Callaway July 23, 1992
24229 Crystal River 3 September 14, 1992
24384 Dresden 2 and 3 October 6, 1992
Attachment 1 IN 93-99 December 21, 1993 Event Notification Licensee Event Notification Date Class
Number
00000 Prairie Island 1 & 2 November 6, 1992 1
00000 St. Lucie 1 November 30, 1992 1
24757 Maine Yankee December 15, 1992 5
00000 Diablo Canyon 1 and 2 December 22, 1992 1
24845 Point Beach 1 and 2 January 7, 1993 1
25248 (TOL) Pilgrim March 29, 1993 5
25362 South Texas April 6, 1993 5 Events Notification Number-00000 Licensees whose undervoltage relay setpoint
notifications to the NRC were reported by LERs, licensee letter, etc., and
event notification numbers if any, were not known.
Class Definitions:
1. Undervoltage Relay setpoints were found to be incorrect because of
design errors.
2. Undervoltage Relay setpoints, as found, were not the same as required by
the technical specification.
3. Safety load circuit breaker thermal overloads or other trip setpoints
were too low because of design errors.
4. Safety load circuit breaker thermal overload, or other trip setpoints, as found, were not the same as required by the technical specification.
5. Membership in one of the preceding four classes could not be definitely
established because of incomplete information in the event notification.
Att~ehment 2 IN 93-99 December 21, 1993 LIST OF RECENTLY ISSUED
NRC INFORMATION NOTICES
Information Date of
Notice No. Subject Issuance Issued to
93-98 Motor Brakes on Valve 12/20/93 All holders of OLs and CPs
Actuator Motors for nuclear power reactors.
93-97 Failures of Yokes 12/17/93 All holders of OLs or CPs
Installed on Walworth for nuclear power reactors.
Gate and Globe Valves
93-96 Improper Reset Causes 12/14/93 All holders of OLs or CPs
Emergency Diesel for nuclear power reactors.
Generator Failures
93-95 Storm-Related Loss of 12/13/93 All holders of OLs or CPs
Offsite Power Events for nuclear power reactors
due to Salt Buildup located close to a large
on Switchyard Insulators body of salt water.
93-94 Unauthorized Forced 12/09/93 All holders of OLs or CPs
Entry into the Pro- for nuclear power reactors.
tected Area at Three
Mile Island Unit 1 on
February 7, 1993
93-93 Inadequate Control of 12/08/93 All holders of OLs or CPs
Reactor Coolant System for nuclear power reactors.
Conditions During Shutdown
93-92 Plant Improvements to 12/07/93 All holders of OLs or CPs
Mitigate Common Depend- for nuclear power reactors.
encies in Component
Cooling Water Systems
91-21, Inadequate Quality 12/07/93 All holders of OLs or CPs
Supp. 1 Assurance Program of for nuclear power reactors
Vendor Supplying and all recipients of
Safety-Related Equipment NUREG-0040, 'License Con- tractor and Vendor Inspec- tion Status ReportR (White
Book)..
OL - Operating License
CP = Construction Permit
IN 93-99 December 21, 1993 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.
Odginal signed by
Brian K.Grimes
Brian K. Grimes, Director
Division of Operating Reactor Support
Office of Nuclear Reactor Regulation
Technical contact: C. Morris, NRR
(301) 504-2778 Attachments:
1. Representative List of Undervoltage
Relay Setpoint Revisions 1988-1993
2. List of Recently Issued NRC Information Notices
E plion:
The stress laid by the initial reviewer on the degree of concern that
licensees and the staff should feel for such a widespread and persistent
preblem, viz. low UVR set points, has been all but eliminated from the
present IN.
- C.MORRIS (S/D) (SEE PREVIOUS CONC.)
15 NOV. 93
- SEE PREVIOUS CONCURRENCES
- C/OGCB:DORS:NRR D/DORS:NRR
NCampbell GHMarcus
07/30/93 08/10/93 12//$193
- EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *D/DE: NRR *RPB:ADM
CMorris EWWeiss CHBerlinger JTWiggins Tech Ed
04/28/93 95/19/93 05/19/93 07/23/93 07/13/93
- Concurred in electronically by JMain.
DOC NAME: 93-99.IN
IN 93-XX
November XX, 1993 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.
Brian K. Grimes, Director
Division of Operating Reactor Support
Office of Nuclear Reactor Regulation
Technical contact: C. Morris, NRR
(301) 504-2778 Attachments:
1. Representative List of Undervoltage
Relay Setpoint Revisions 1988-1993
2. List of Recently Issued NRC Information Notices
Exception:
The stress laid by the initial reviewer on the degree of concern that
licensees and the staff should feel for such a widespread and persistent
problem, viz. low UVR set points, has been all but eliminated from the
present IN. G4'
C.MORRIS
15 NOV. 93 Document Name: G:\SHARED\R3UNRELS.IN
- SEE PREVIOUS CONCURRENCES # Concurred in electronically by JMain.
D/DORS:NRR *C/OGCB: DORS:NRR *OGCB:DORS:NRR
BKGrimes GHMarcus NCampbell
11/ /93 A 08/10/93 07/30/93
- EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *D/DE:NRR *RPB:ADM
CMorris EWWeiss CHBerlinger JTWiggins Tech Ed
04/28/93 05/19/93 05/19/93 07/23/93 07/13/93
&Wp: 4 & Lso1
IN 93-XX
November XX, 1993 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.
Brian K. Grimes, Director
Division of Operating Reactor Support
Office of Nuclear Reactor Regulation
Technical contact: C. Morris, NRR
(301) 504-2778 Attachments:
1. Representative List of Undervoltage
Relay Setpoint Revisions 1988-1993
2. List of Recently Issued NRC Information Notices
Document Name: G:\SHARED\R3UNRELS.IN
- SEE PREVIOUS CONCURRENCES # Concurred in electronically by JMain.
D/DORS:NRR *C/OGCB:DWRS:NRR *OGCB: DORS:NRR
BKGrimes GHMarcus NCampbell
ll/ /93 08/10/93 07/30/93
- EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *D/DE:NRR *RPB:ADM
CMorris EWWeiss CHBerlinger JTWiggins Tech Ed
04/28/93 05/19/93 05/19/93 07/23/93 07/13/93
IN 93-XX
August XX, 1993 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.
Brian K. Grimes, Director
Division of Operating Reactor Support
Office of Nuclear Reactor Regulation
Technical contact: C. Morris, NRR
(301) 504-2778 Attachments:
1. Representative List of Undervoltage
Relay Setpoint Revisions 1988-1993
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
Document Name: UNRELSET.IN DORS/OGCB D/DORS: C/OGCB: DORS:NRR
NCampbell BKGrime GHMarcus6#/W
07/30/93 08/ /93 08/to /93
- EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *D/DE :NRR *RPB:ADM
CMorris EWWeiss CHBerlinger JTWiggins Tech Ed
04/28/93 05/19/93 05/19/93 07/23/93 07/13/93
- Concurred in electronically by JMain.
IN 93-XX
August XX, 1993 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.
Brian K. Grimes, Director
Division of Operational Events
Assessment
Office of Nuclear Reactor Regulation
Technical contact: C. Morris, NRR
(301) 504-2778 Attachments:
1. Representative List of Undervoltage Relay Setpoint Revisions 1988-1993
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
Document Name: UNRELSET.IN DRS/OGCB D/DORS:NRR C/OGCB:DORS:NRR
NCampbell BKGrimes GHMarcus
07/8* /93 07/ /93 07/ /93
- EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *D/DE:NRR *RPB:ADM
CMorris EWWeiss CHBerlinger JTWiggins Tech Ed
04/28/93 05/19/93 05/19/93 07/23/93 07/13/93
- Concurred in electronically by JMain.
_> K_> IN 93-XX
July XX, 1993 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.
Brian K. Grimes, Director
Division of Operational Events
Assessment
Office of Nuclear Reactor Regulation
Technical contact: C. Morris, NRR
(301) 504-2778 Attachments:
1. Representative List of Undervoltage Relay Setpoint Revisions 1988-1993
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
Document Name: UNRELSET.IN DORS/OGCB D/DORS:NRR
NCampbell BIKGrimes Marcus
07/ /93 0,7/ /24 T/ /93
- EELB:DE:NRR *SC/EELB:DE:NRR *C/EELB:DE:NRR *RPB:ADM
CMorris EWWeiss CHBerlinger Tech Ed
04/28/93 05/19/93 05/19/93 07/13/93
- Concurred in electronically by JMain.
|
---|
|
list | - Information Notice 1993-01, Accuracy of Motor-Operated Valve Diagnostic Equipment Manufactured by Liberty Technologies (4 January 1993)
- Information Notice 1993-02, Malfunction of a Pressurizer Code Safety Valve (4 January 1993, Topic: Loop seal)
- Information Notice 1993-04, Investigation and Reporting of Misadministrations by the Radiation Safety Officer (7 January 1993, Topic: Uranium Hexafluoride, Overexposure)
- Information Notice 1993-05, Locking of Radiography Exposure Devices (14 January 1993, Topic: Uranium Hexafluoride, Inattentive)
- Information Notice 1993-06, Potential Bypass Leakage Paths Around Filters Installed in Ventilation Systems (22 January 1993)
- Information Notice 1993-07, Classification of Transportation Emergencies (1 February 1993, Topic: Uranium Hexafluoride)
- Information Notice 1993-08, Failure of Residual Heat Removal Pump Bearings Due to High Thrust Loading (1 February 1993, Topic: Probabilistic Risk Assessment)
- Information Notice 1993-09, Failure of Undervoltage Trip Attachment on Westinghouse Model DB-50 Reactor Trip Breaker (2 February 1993)
- Information Notice 1993-10, Dose Calibrator Quality Control (2 February 1993, Topic: Uranium Hexafluoride)
- Information Notice 1993-11, Single Failure Vulnerability of Engineered Safety Features Actuation Systems (4 February 1993)
- Information Notice 1993-12, Off-Gassing in Auxiliary Feedwater System Raw Water Sources (11 February 1993)
- Information Notice 1993-13, Undetected Modification of Flow Characteristics in High Pressure Safety Injection System (16 February 1993)
- Information Notice 1993-14, Clarification of 10 CFR 40.22, Small Quantities of Source Material (18 February 1993)
- Information Notice 1993-15, Failure to Verify the Continuity of Shunt Trip Attachment Contacts in Manual Safety Injection and Reactor Trip Switches (18 February 1993)
- Information Notice 1993-16, Failures of Not-Locking Devices in Check Valves (19 February 1993, Topic: Anchor Darling, Flow Induced Vibration)
- Information Notice 1993-17, Safety Systems Response to Loss of Coolant and Loss of Offsite Power (25 March 1994, Topic: Fire Barrier, Backfit)
- Information Notice 1993-18, Portable Moisture-Density Gauge User Responsibilities During Field Operations (10 March 1993, Topic: Moisture Density Gauge, Stolen)
- Information Notice 1993-19, Slab Hopper Bulging (17 March 1993, Topic: Hydrostatic)
- Information Notice 1993-20, Thermal Fatigue Cracking of Feedwater Piping to Steam Generators (24 March 1993, Topic: Thermal fatigue)
- Information Notice 1993-21, Summary of NRC Staff Observations Compiled During Engineering Audits or Inspections of Licensee Erosion/Corrosion Programs (25 March 1993, Topic: Weld Overlay, Thermal fatigue)
- Information Notice 1993-22, Tripping of Klockner-Moeller Molded-Case Circuit Breakers Due to Support Lever Failure (26 March 1993, Topic: Commercial Grade, Thermal fatigue)
- Information Notice 1993-23, Weschler Instruments Model 252 Switchboard Meters (31 March 1993, Topic: Commercial Grade, Thermal fatigue)
- Information Notice 1993-24, Distribution of Revision 7 of NUREG-1021, Operation Licensing Examiner Standards (31 March 1993, Topic: Job Performance Measure, Thermal fatigue)
- Information Notice 1993-25, Electrical Penetration Assembly Degradation (1 April 1993)
- Information Notice 1993-26, Grease Soldification Causes Molded-Case Circuit Breaker Failure to Close (31 January 1994)
- Information Notice 1993-27, Level Instrumentation Inaccuracies Observed During Normal Plant Depressurization (8 April 1993, Topic: Reactor Vessel Water Level)
- Information Notice 1993-28, Failure to Consider Loss of DC Bus in the Emergency Core Cooling System Evaluation May Lead to Nonconservative Analysis (9 April 1993, Topic: Fuel cladding)
- Information Notice 1993-29, Problems with the Use of Unshielded Test Leads in Reactor Protection System Circuitry (12 April 1993)
- Information Notice 1993-30, NRC Requirements for Evaluation of Wipe Test Results; Calibration of Count Rate Survey Instruments (12 April 1993)
- Information Notice 1993-31, Training of Nurses Responsible for the Care of Patients with Brachytherapy Implants (13 April 1993, Topic: Brachytherapy)
- Information Notice 1993-32, Nonconservative Inputs for Boron Dilution Events Analysis (21 April 1993, Topic: Shutdown Margin)
- Information Notice 1993-33, Potential Deficiency of Certain Class Ie Instrumental and Control Cables (28 April 1993)
- Information Notice 1993-33, Potential Deficiency of Certain Class IE Instrumental and Control Cables (28 April 1993, Topic: Brachytherapy)
- Information Notice 1993-34, Potential for Loss of Emergency Cooling Function Due to a Combination of Operational and Post-LOCA Debris in Containment (6 May 1993, Topic: Brachytherapy)
- Information Notice 1993-35, Insights from Common-Cause Failure Events (12 May 1993, Topic: Brachytherapy)
- Information Notice 1993-36, Notifications, Reports, and Records of Misadministrations (7 May 1993, Topic: Brachytherapy)
- Information Notice 1993-37, Eyebolts with Indeterminate Properties Installed in Limitorque Valve Operator Housing Covers (19 May 1993, Topic: Brachytherapy)
- Information Notice 1993-38, Inadequate Testing of Engineered Safety Features Actuation Systems (24 May 1993)
- Information Notice 1993-39, Radiation Beams From Power Reactor Biological Shields (25 May 1993)
- Information Notice 1993-39, Radiation Beams from Power Reactor Biological Shields (25 May 1993)
- Information Notice 1993-40, Fire Endurance Test Results for Thermal Ceramics FP-60 Fire Barrier Material (26 May 1993, Topic: Safe Shutdown, Fire Barrier, Fire Protection Program)
- Information Notice 1993-41, One Hour Fire Endurance Test Results for Thermal Ceramics Kaowool, 3M Company FS-195 and 3M Company Interam E-50 Fire Barrier Systems (28 May 1993, Topic: Safe Shutdown, Fire Barrier)
- Information Notice 1993-42, Failure of Anti-Rotation Keys in Motor-Operated Valves Manufactured by Yelan (9 June 1993)
- Information Notice 1993-43, Use of Inappropriate Lubrication Oils in Satety-Related Applications (10 June 1993, Topic: Commercial Grade)
- Information Notice 1993-44, Operational Challenges During a Dual-Unit Transient (15 June 1993)
- Information Notice 1993-45, Degradation of Shutdown Cooling System Performance (16 June 1993)
- Information Notice 1993-46, Potential Problem with Westinghouse Rod Control System and Inadvertent Withdrawal of Single Rod Control Cluster Assembly (10 June 1993)
- Information Notice 1993-47, Unrecognized Loss of Control Room Annunciators (18 June 1993)
- Information Notice 1993-48, Failure of Turbine-Driven Main Feedwater Pump to Trip Because of Contaminated Oil (6 July 1993, Topic: Water hammer)
- Information Notice 1993-49, Improper Integration of Software Into Operating Practices (8 July 1993)
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