Information Notice 1996-24, Preconditioning of Molded-Case Circuit Breakers Before Surveillance Testing: Difference between revisions

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{{#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. 20555-0001 April 25, 1996 NRC INFORMATION


NOTICE 96-24: PRECONDITIONING
WASHINGTON, D.C. 20555-0001 April 25, 1996 NRC INFORMATION NOTICE 96-24:   PRECONDITIONING OF MOLDED-CASE CIRCUIT BREAKERS


OF MOLDED-CASE
BEFORE SURVEILLANCE TESTING
 
CIRCUIT BREAKERS BEFORE SURVEILLANCE
 
TESTING


==Addressees==
==Addressees==
All holders of operating
All holders of operating licenses or construction permits for nuclear power


licenses or construction
reactors.
 
permits for nuclear power reactors.


==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 the detrimental
 
effect that preconditioning
 
of molded-case
 
circuit breakers could have on the diagnostic
 
validity of surveillance
 
tests. It is expected that recipients
 
will review this information
 
for applicability
 
to their facilities
 
and consider actions, as appropriate, to avoid similar problbms.
 
However, suggestions
 
contained
 
in this information
 
notice are not NRC requirements;
therefore, no specific action or written response is required.DescriDtion
 
of Circumstances
 
During an inspection
 
at the Diablo Canyon Nuclear Power Plant (IR 50-275, 323/94-27 dated December 21, 1994), NRC inspectors
 
noted that the licensee preconditioned
 
circuit breakers before performing
 
surveillance
 
testing.Before the overcurrent
 
trip testing, Diablo Canyon staff exercised
 
the circuit breakers by manually opening and closing them three times. The plant staff'did not record the as-found condition
 
of the breakers in terms of unexercised
 
trip currents and times.During another inspection
 
at the South Texas Project (IR 50-498, 499/94-35 dated January 19, 1995), NRC inspectors
 
noted that the licensee exercised similar circuit breakers manually at least five times before testing the overcurrent
 
trip unit.Discussion
 
A molded-case
 
circuit breaker is one of the most widely used protective
 
devices for electrical
 
circuits at nuclear power plants. Its proper operation is essential
 
for the protection
 
and safe operation
 
of plant electrical
 
equipment.
 
Many circuit breakers are continuously
 
energized
 
for long periods.Often they are in service for years and are rarely, if ever, called upon to perform a protective
 
function.
 
Nevertheless, when needed, they must rapidly isolate a faulted or overloaded
 
circuit to prevent equipment
 
damage.Therefore, for the safe operation
 
of the electrical
 
distribution
 
system equipment
 
of a nuclear power plant, it is important
 
to periodically
 
verify their continued
 
reliability..K VE uor~cEya-0OZ
 
%6qZ 'I
 
K>I IN 96-24 April 25, 1996 Periodic inspection
 
and testing of circuit breakers in their as-found condition
 
is an appropriate
 
way of demonstrating
 
the functional
 
operability
 
of the breaker and of detecting
 
any degradation.
 
However, the practice of preconditioning
 
before testing (e.g., lubricating
 
pivot points and manually cycling the breaker) defeats the purpose of the periodic test. Such preconditioning
 
does not confirm continued


operability
notice to alert addressees to the detrimental effect that preconditioning of


between tests nor does it provide information
molded-case circuit breakers could have on the diagnostic validity of


on the condition
surveillance tests. It is expected that recipients will review this


of the circuit breaker for trending purposes.
information for applicability to their facilities and consider actions, as


Testing some circuit breakers in the as-found condition
appropriate, to avoid similar problbms. However, suggestions contained in


can provide useful data on which to base decisions
this information notice are not NRC requirements; therefore, no specific


on surveillance
action or written response is required.


intervals
DescriDtion of Circumstances


and the ability of the untested circuit breakers to perform their intended function.Since only a fraction of the circuit breakers are tested each refueling
During an inspection at the Diablo Canyon Nuclear Power Plant (IR 50-275,
323/94-27 dated December 21, 1994), NRC inspectors noted that the licensee


outage to justify the operability
preconditioned circuit breakers before performing surveillance testing.


of the remaining
Before the overcurrent trip testing, Diablo Canyon staff exercised the circuit


circuit breakers, preconditioning
breakers by manually opening and closing them three times. The plant staff


before testing does not provide the expected assurance
'did not record the as-found condition of the breakers in terms of unexercised


of the operability
trip currents and times.


of remaining
During another inspection at the South Texas Project (IR 50-498, 499/94-35 dated January 19, 1995), NRC inspectors noted that the licensee exercised


breakers which are not tested. By preconditioning
similar circuit breakers manually at least five times before testing the


circuit breakers, useful information
overcurrent trip unit.


may be lost because the breaker may not have been capable of performing
Discussion


its intended function without preconditioning.
A molded-case circuit breaker is one of the most widely used protective


To correct this situation, Diablo Canyon Power Plant plans to revise the electrical
devices for electrical circuits at nuclear power plants. Its proper operation


maintenance
is essential for the protection and safe operation of plant electrical


procedure
equipment. Many circuit breakers are continuously energized for long periods.


before the next surveillance
Often they are in service for years and are rarely, if ever, called upon to


test has to be performed.
perform a protective function.     Nevertheless, when needed, they must rapidly


The revised procedures
isolate a faulted or overloaded circuit to prevent equipment damage.


will state that electrical
Therefore, for the safe operation of the electrical distribution system


testing should be performed
equipment of a nuclear power plant, it is important to periodically verify


before any intentional
their continued reliability.


manual exercising
.K


of the breakers, and to ensure that electrical
VE        uor~cEya-0OZ              %6qZ                      'I


testing on breakers with removable
I


trip units is performed
K>
                                                              IN 96-24 April 25, 1996 Periodic inspection and testing of circuit breakers in their as-found


before removing the trip unit.Some plants have older technical
condition is an appropriate way of demonstrating the functional operability of


specification
the breaker and of detecting any degradation. However, the practice of


bases that cite National Electrical
preconditioning before testing (e.g., lubricating pivot points and manually


Manufacturers
cycling the breaker) defeats the purpose of the periodic test. Such


Association (NEMA) Standard AB 2-1980. This version of the standard specifies
preconditioning does not confirm continued operability between tests nor does


mechanical
it provide information on the condition of the circuit breaker for trending


cycling of circuit breakers prior to electrical
purposes. Testing some circuit breakers in the as-found condition can provide


testing. In later versions of this standard, this procedure
useful data on which to base decisions on surveillance intervals and the


was deleted. There appears to be no valid technical
ability of the untested circuit breakers to perform their intended function.


need for mechanical
Since only a fraction of the circuit breakers are tested each refueling outage


cycling prior to electrical
to justify the operability of the remaining circuit breakers, preconditioning


surveillance
before testing does not provide the expected assurance of the operability of


testing.The NRC has issued other generic communications
remaining breakers which are not tested. By preconditioning circuit breakers, useful information may be lost because the breaker may not have been capable


on molded-case
of performing its intended function without preconditioning.


circuit breaker applications
To correct this situation, Diablo Canyon Power Plant plans to revise the


and testing: NRC Information
electrical maintenance procedure before the next surveillance test has to be


Notice (IN) 92-51, and its Supplement
performed. The revised procedures will state that electrical testing should


1, "Misapplication
be performed before any intentional manual exercising of the breakers, and to


and Inadequate
ensure that electrical testing on breakers with removable trip units is


Testing of Molded-Case
performed before removing the trip unit.


Circuit Breakers;" IN 93-26, "Grease Solidification
Some plants have older technical specification bases that cite National


Causes Molded Case Circuit Breaker Failure to Close;" and IN 93-64, "Periodic
Electrical Manufacturers Association (NEMA) Standard AB 2-1980. This version


Testing and Preventive
of the standard specifies mechanical cycling of circuit breakers prior to


Maintenance
electrical testing. In later versions of this standard, this procedure was


of Molded-Case
deleted. There appears to be no valid technical need for mechanical cycling


Circuit Breakers."
prior to electrical surveillance testing.
If I IN 96-24 April 25, 1996 This information


notice requires no specific action or written response.
The NRC has issued other generic communications on molded-case circuit breaker


If you have any questions
applications and testing: NRC Information Notice (IN) 92-51, and its


about the information
Supplement 1, "Misapplication and Inadequate Testing of Molded-Case Circuit


in this notice, please contact one of the technical
Breakers;" IN 93-26, "Grease Solidification Causes Molded Case Circuit Breaker


contacts listed below or the appropriate
Failure to Close;" and IN 93-64, "Periodic Testing and Preventive Maintenance


Office of Nuclear Reactor Regulation (NRR) project manager. /a L.." Brian K. Grimes, Acting Director Division of Reactor Program Management
of Molded-Case Circuit Breakers."


===Office of Nuclear Reactor Regulation===
If I
Technical


contacts: Sikhindra
IN 96-24 April 25, 1996 This information notice requires no specific action or written response. If


Mitra, NRR (301) 415-2783 Internet:skml@nrc.gov
you have any questions about the information in this notice, please contact


Steve Alexander, NRR (301) 415-2995 Internet:sda@nrc.gov
one of the technical contacts listed below or the appropriate Office of


Christopher
Nuclear Reactor Regulation (NRR) project manager.          /a


Myers, RIV (817) 860-8144 Internet:cjm@nrc.gov
L.."
                                      Brian K. Grimes, Acting Director


Attachment:
Division of Reactor Program Management
List of Recently Issued NRC Information


Notices-tw@ / "Y
Office of Nuclear Reactor Regulation


===K Attachment===
Technical contacts:  Sikhindra Mitra, NRR
IN 96-24 April 25, 1996 LIST OF RECENTLY ISSUED NRC INFORMATION


NOTICES Information
(301) 415-2783 Internet:skml@nrc.gov


Date of Notice No. Subject Issuance Issued to 96-23 96-22 96-21 96-20 Fires in Emergency
Steve Alexander, NRR


Diesel Generator
(301) 415-2995 Internet:sda@nrc.gov


Exciters During Operation
Christopher Myers, RIV


Following
(817) 860-8144 Internet:cjm@nrc.gov


Unde-tected Fuse Blowing Improper Equipment
Attachment:  List of Recently Issued NRC Information Notices


Set-tings Due to the Use of Nontemperature-Compensated
-tw@      / "Y


Test Equipment Safety Concerns Related to the Design of the Door Interlock
K


Circuit on Nucletron
Attachment


High-Dose
IN 96-24 April 25, 1996 LIST OF RECENTLY ISSUED


===Rate and Pulsed Dose Rate Remote Afterloading===
NRC INFORMATION NOTICES
Brachytherapy


Devices Demonstration
Information                                  Date of


of Associ-ated Equipment
Notice No.            Subject                Issuance    Issued to


Compliance
96-23        Fires in Emergency Diesel      04/22/96      All holders of OLs or CPs


with 10 CFR 34.20 Failure of Tone Alert Radios to Activate When Receiving
Generator Exciters During                    for nuclear power reactors


a Shortened Activation
Operation Following Unde- tected Fuse Blowing


Signal Compliance
96-22          Improper Equipment Set-        04/11/96    All holders of OLs or CPs


with 10 CFR Part 20 for Airborne Thorium Loss of Reactor Coolant Inventory
tings Due to the Use of                      for nuclear power reactors


and Potential Loss of Emergency
Nontemperature-Compensated


Mitiga-tion Functions
Test Equipment


While in a Shutdown Condition 04/22/96 04/11/96 04/10/96 04/04/96 04/02/96 03/25/96 03/25/96 All holders of OLs or CPs for nuclear power reactors All holders of OLs or CPs for nuclear power reactors All U.S. NRC Medical to the Licensees
96-21          Safety Concerns Related        04/10/96     All U.S. NRC Medical to the


authorized
to the Design of the Door                  Licensees authorized to use


to use brachytherapy
Interlock Circuit on                        brachytherapy sources in


sources in high- and pulsed-dose-rate
Nucletron High-Dose Rate                    high- and pulsed-dose-rate


remote afterloaders
and Pulsed Dose Rate                        remote afterloaders


All industrial
Remote Afterloading


radiography
Brachytherapy Devices


licensees
96-20          Demonstration of Associ-      04/04/96    All industrial radiography


and radiography
ated Equipment Compliance                  licensees and radiography


equipment
with 10 CFR 34.20                          equipment manufacturers


manufacturers
96-19          Failure of Tone Alert          04/02/96    All holders of OLs or CPs


All holders of OLs or CPs for nuclear power reactors All material licensees authorized
Radios to Activate When                    for nuclear power reactors


to possess and use thorium in unsealed form All holders of OLs or CPs for PWR power plants 96-19 96-18 95-03 Supp. 1 OL = Operating
Receiving a Shortened


License CP -Construction
Activation Signal


Permit
96-18          Compliance with 10 CFR        03/25/96    All material licensees


K2 2 IN 96-24 April 25, 1996 This information
Part 20 for Airborne                        authorized to possess and


notice requires no specific action or written response.
Thorium                                    use thorium in unsealed


If you have any questions
form


about the information
95-03          Loss of Reactor Coolant        03/25/96    All holders of OLs or CPs


in this notice, please contact one of the technical
Supp. 1        Inventory and Potential                    for PWR power plants


contacts listed below or the appropriate
Loss of Emergency Mitiga- tion Functions While in a


Office of Nuclear Reactor Regulation (NRR) project manager.original signed by Brian K. Grimes, Acting Director Division of Reactor Program Management
Shutdown Condition


===Office of Nuclear Reactor Regulation===
OL = Operating License
Technical


contacts: Sikhindra
CP - Construction Permit


Mitra, NRR (301) 415-2783 Internet:skml@nrc.gov
K2                                                2        IN 96-24 April 25, 1996 This information notice requires no specific action or written response. If


Steve Alexander, NRR (301) 415-2995 Internet:sda@nrc.gov
you have any questions about the information in this notice, please contact


Christopher
one of the technical contacts listed below or the appropriate Office of


Myers, RIV (817) 860-8144 Internet:cjm@nrc.gov
Nuclear Reactor Regulation (NRR) project manager.


Attachment:
original signed by
List of Recently Issued NRC Information


Notices DOCUMENT NAME: 96-24.IN Tech Editor reviewed 9/21/95 To receive a copy of this document, Indicate In the box: 'C' -Copy without enclosures
Brian K. Grimes, Acting Director


'E" = Copy with sncloRre l -= No copy OFFICE Contacts C IEELB NAME CMyers
Division of Reactor Program Management


* JCalvo
Office of Nuclear Reactor Regulation


* AChatfee s SMitra * /SAlexander*
Technical contacts:                Sikhindra Mitra, NRR
7 , DATE 4/22/96 4/15/96 4/22/96 4/LT/96 OFFICIAL RECORD COPY


IN 96-XX April XX, 1996 This information
(301) 415-2783 Internet:skml@nrc.gov


notice requires no specific action or written response.
Steve Alexander, NRR


If you have any questions
(301) 415-2995 Internet:sda@nrc.gov


about the information
Christopher Myers, RIV


in this notice, please contact one of the technical
(817) 860-8144 Internet:cjm@nrc.gov


contacts listed below or the appropriate
Attachment:          List of Recently Issued NRC Information Notices


Office of Nuclear Reactor Regulation (NRR) project manager.Dennis M. Crutchfield, Director Division of Reactor Program Management
DOCUMENT NAME:            96-24.IN              Tech Editor reviewed 9/21/95 To receive a copy of this document, Indicate In the box: 'C'  - Copy without enclosures 'E" = Copy with sncloRre -l = No copy


===Office of Nuclear Reactor Regulation===
OFFICE        Contacts                    C                                          IEELB
Technical


contacts: Sikhindra
NAME          CMyers *                    JCalvo *                AChatfee                            s


Mitra, NRR (301) 415-2783 Internet:
SMitra *                                                                                  /
skmlnrc.gov
              SAlexander*                                              7      ,
DATE          4/22/96                      4/15/96                  4/22/96                    4/LT/96 OFFICIAL RECORD COPY


Christopher
IN 96-XX


Myers, RIV (817) 860-8144 Internet:
April XX, 1996 This information notice requires no specific action or written response. If
cjm@nrc.gov


Steve Alexander, NRR (301) 415-2995 Internet:
you have any questions about the information in this notice, please contact
sda@nrc.gov


Attachment:
one of the technical contacts listed below or the appropriate Office of
List of Recently Issued NRC Information


Notices DOCUMENT NAME: 95-XX.IN To receive a copy of this document.
Nuclear Reactor Regulation (NRR) project manager.


Indicate In the box: Tech Editor reviewed 9/21/95'C' -Copy without enclosures
Dennis M. Crutchfield, Director


fEw -Copy wi th enclosures
Division of Reactor Program Management


'N' -No copy OFFICE IContacts
Office of Nuclear Reactor Regulation


C/EELB I D/DRPI l NAME CMyers
Technical contacts: Sikhindra Mitra, NRR                                          Christopher Myers, RIV


* JCalvo
(301) 415-2783                                    (817) 860-8144 Internet: skmlnrc.gov                            Internet: cjm@nrc.gov


* AChaffee DCrutchfield
Steve Alexander, NRR


SMitra *SAlexanderLnfi_
(301) 415-2995 Internet: sda@nrc.gov
DATE 4 /15/96 7' 4/15/96 4/ /96 4/ /96.-------UICLIAL KECOKR COPY ,44 I 1 i< -' IN 96-XX April XX, 1996 This information


notice requires no specific action or written response.
Attachment:        List of Recently Issued NRC Information Notices


If you have any questions
DOCUMENT NAME:          95-XX.IN              Tech Editor reviewed 9/21/95 To receive a copy of this document. Indicate In the box: 'C' - Copy without enclosures fEw - Copy with enclosures 'N' - No copy


about the information
OFFICE      IContacts                    C/EELB                                              D/DRPI lI


in this notice, please contact one of the technical
NAME          CMyers *                    JCalvo *                AChaffee                  DCrutchfield


contacts listed below or the appropriate
SMitra *
              SAlexanderLnfi_
DATE          4 /15/96          7'        4/15/96                  4/ /96                  4/ /96
                                      . -        -    - -  -  - -
                                    UICLIAL KECOKR            COPY


Office of Nuclear Reactor Regulation (NRR) project manager.Dennis M. Crutchfield, Director Division of Reactor Program Management
,44


===Office of Nuclear Reactor Regulation===
I                                          1  i
Technical


contacts: Sikhindra
<-'      IN 96-XX


Mitra, NRR (301) 415-2783 Internet:
April XX, 1996 This information notice requires no specific action or written response. If
skmlnrc.gov


Christopher
you have any questions about the information in this notice, please contact


Myers, RIV (817) 860-8144 Internet:
one of the technical contacts listed below or the appropriate Office of
cjm~nrc.gov


Attachment:
Nuclear Reactor Regulation (NRR) project manager.
List of Recently Issued NRC Information


Notices DOCUMENT NAME: 95-XX.IN Tech Editor reviewed 9/21/95 To receive a copy of this document, Indicate In the box: 'C' -Copy without enclosures
Dennis M. Crutchfield, Director


'E' -Copy with enclosures
Division of Reactor Program Management


'No = No copylOFFICE Contacts I C/EELB l C/PECB I DRPM I NAME CMyers
Office of Nuclear Reactor Regulation


* JCalvo
Technical contacts: Sikhindra Mitra, NRR                                            Christopher Myers, RIV


* AChaffee DCrutchfield
(301) 415-2783                                    (817) 860-8144 Internet: skmlnrc.gov                              Internet: cjm~nrc.gov


SMitra *DATE 4 /I5/96 4/11 /96 4/ 4/ /96 OFFICIAL RECORD COPY
Attachment:          List of Recently Issued NRC Information Notices


IN 96-XX April XX, 1996 This information
DOCUMENT NAME:            95-XX.IN              Tech Editor reviewed 9/21/95 To receive a copy of this document, Indicate In the box: 'C' - Copy without enclosures 'E' - Copy with enclosures 'No = No copy


notice requires no specific action or written response.
lOFFICE        Contacts          I        C/EELB          l      C/PECB            I          DRPM        I


If you have any questions
NAME          CMyers *                    JCalvo *                AChaffee                    DCrutchfield


about the information
SMitra *
DATE            4 /I5/96                    4/11 /96                  4/                        4/ /96 OFFICIAL RECORD COPY


in this notice, please contact one of the technical
IN 96-XX


contacts listed below or the appropriate
April XX, 1996 This information notice requires no specific action or written response. If


Office of Nuclear Reactor Regulation (NRR) project manager.Dennis M. Crutchfield, Director Division of Reactor Program Management
you have any questions about the information in this notice, please contact


===Office of Nuclear Reactor Regulation===
one of the technical contacts listed below or the appropriate Office of
Technical


contacts: Christopher
Nuclear Reactor Regulation (NRR) project manager.


Myers, RIV (817) 860-8144 Sikhindra
Dennis M. Crutchfield, Director


Mitra, NRR (301) 415-2783 Attachment:
Division of Reactor Program Management
List of Recently Issued NRC Information


Notices DOCUMENT NAME: 95-XX.IN Tech Editor reviewed 9/21/95 To receive a copy of this document.
Office of Nuclear Reactor Regulation


Indicate In the box: wCw = Copy without enclosures
Technical contacts:               Christopher Myers, RIV


'E" -Copy with enclosures
(817) 860-8144 Sikhindra Mitra, NRR


'N'= No copy OFFICE Contacts C/EELB I NAME Myers JCalvoJy r AChaffee DCrutchfield
(301) 415-2783 Attachment:        List of Recently Issued NRC Information Notices


I ~SMi tra_ _ _ _ _ _ _DATE 4 /16796 4/ I7 /96 4/ /96 4/ /96 OFFICIAL RECORD COPY
DOCUMENT NAME:          95-XX.IN              Tech Editor reviewed 9/21/95 To receive a copy of this document. Indicate In the box: wCw  =  Copy without enclosures 'E" - Copy with enclosures 'N'= No copy


IN 96-XX April xx, 1996 This information
OFFICE        Contacts                  C/EELB            I


notice requires no specific action or written response.
NAME          Myers                      JCalvoJy        r          AChaffee                  DCrutchfield


If you have any questions
I          ~SMi tra_                        _  _    _  _    _  _
DATE            4 /16796                    4/ I7/96                    4/ /96                  4/ /96 OFFICIAL RECORD COPY


about the information
IN 96-XX


in this notice, please contact one of the technical
April xx, 1996 This information notice requires no specific action or written response. If


contacts listed below or the appropriate
you have any questions about the information in this notice, please contact


Office of Nuclear Reactor Regulation (NRR) project manager.Dennis M. Crutchfield, Director Division of Reactor Program Management
one of the technical contacts listed below or the appropriate Office of


===Office of Nuclear Reactor Regulation===
Nuclear Reactor Regulation (NRR) project manager.
Technical


contacts: Tom Westerman, RIV (817) 860-8145 Christopher
Dennis M. Crutchfield, Director


Myers, RIV (817) 860-8144 Stephen Alexander, NRR (301) 415-2995 Sikhindra
Division of Reactor Program Management


Mitra, NRR (301) 415-2783 Attachment:
Office of Nuclear Reactor Regulation
List of Recently Issued NRC Information


Notices DOCUMENT NAME: 95-XX.IN T - 5 .LL.1. .I *k. i hn,.. tC = -Cnnu without enclosures
Technical contacts:           Tom Westerman, RIV                                              Christopher Myers, RIV


rcv
(817) 860-8145                                                  (817) 860-8144 Stephen Alexander, NRR                                          Sikhindra Mitra, NRR


* wprs r^uumn, juciva lwi'Jw. --r,. ...........................
(301) 415-2995                                                  (301) 415-2783 Attachment:        List of Recently Issued NRC Information Notices


,* .See previous concurrence
DOCUMENT NAME: 95-XX.IN                                                                * . See previous concurrence


=E' CoDv with enclosures
* wprs


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                                                                      ...........................      =E' CoDv with enclosures 'N' = No copy


E NAME LTWesterman
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A CMyers k _ TP Gwyn* SAlexander
OFFICE RIV                        liE RIV                  E lRIV                                l E      RIV                E    PSIB:DISP    E


DATE I1 / g/95 t /, /95 / /95 01/25/95 / /95 OFFICE TECH ED N SC:SIB:DISP
NAME            LTWesterman A          CMyers        k        _                                            TP Gwyn*                SAlexander


l EE:DE E SC:EELB:DE
DATE            I1/ g/95                t /,/95                    /        /95                            01/25/95                  / /95 OFFICE TECH ED                      N SC:SIB:DISP l EE:DE                                             E       SC:EELB:DE           E C:EELB:DEl E


E C:EELB:DEl
NAME            WRSanders                                      SKMitra 't                                    ASGill*                  JACalvo*
DATE            109/21/95*                  / /95              41,1/2o%96 I/Y.1                                09/21/95                  9/27/95 OFFICE IPECB:DRPM                      PECB:DRPM              PECB:DRPM                          I        C:PECB:DRPM            l D:DRPM


E NAME WRSanders
NAME           JTKoshy                EFGoodwin*                                                          AChaffee                  DMCrutchfield


SKMitra 't ASGill* JACalvo*DATE 109/21/95*
DATE             IJ/f/96                10/04/95                     I /95                                          /95                       /95 OFFICIAL RECORD COPY
/ /95 41,1/2o%96 I/Y.1 09/21/95 9/27/95 OFFICE IPECB:DRPM


PECB:DRPM
IN 96-XX


PECB:DRPM
January xx, 1995 This information notice requires no specific action or written response. If


I C:PECB:DRPM
you have any questions about the information in this notice, please contact


l D:DRPM NAME JTKoshy EFGoodwin*
one of the technical contacts listed below or the appropriate Office of


===AChaffee DMCrutchfield===
Nuclear Reactor Regulation (NRR) project manager.
DATE IJ /f/96 10/04/95 I /95 /95 /95 OFFICIAL RECORD COPY


IN 96-XX January xx, 1995 This information
Dennis M. Crutchfield, Director


notice requires no specific action or written response.
Division of Reactor Program Management


If you have any questions
Office of Nuclear Reactor Regulation


about the information
Technical contacts:              Tom Westerman, RIV                              Christopher Myers, RIV


in this notice, please contact one of the technical
(817) 860-8145                                  (817) 860-8144 Stephen Alexander, NRR                          Sikhindra Mitra, NRR


contacts listed below or the appropriate
(301) 415-2995                                  (301) 415-2783 Attachment:        List of Recently Issued NRC Information Notices


Office of Nuclear Reactor Regulation (NRR) project manager.Dennis M. Crutchfield, Director Division of Reactor Program Management
DOCUMENT NAME:          95-XX.IN                                          * . See previous concurrence


===Office of Nuclear Reactor Regulation===
To receive a copv ol this document. indicate Inthe box:  C - Coov without enclosures      .
Technical


contacts: Tom Westerman, RIV (817) 860-8145 Christopher
-E' CoDV with enclosures "N"  - No coDY


Myers, RIV (817) 860-8144 Stephen Alexander, NRR (301) 415-2995 Sikhindra
lOFFICE        RI              Tf          RI                E                                  I                          BDS _I


Mitra, (301) 415-2783 NRR Attachment:
NAME          TWesterman                  CMyers                _        _        _        TP Gwyn*                SAl exander
List of Recently Issued NRC Information


Notices DOCUMENT NAME: 95-XX.IN To receive a copv ol this document.
DATE            / /95                  1    I / /9                  IL/5                    01_/25/95                  / /95 OFFICE lTECH ED                      N SC:SIB:DISP          E EELB:DE                  E SC:EELB:DE I E lC:EELB:DEl E


indicate In the box: C -Coov without enclosures
NAME l RSanders                                                  SKMi tra                        ASGill*              JJACalvo*
DATE        l09/21/95*                      / /95                I / 1/96                      09/21/95                  9/27/95 OFFICE JIPECB:DRPM                                      PECB:DRPM                      I C:PECB:DRPMl D:DRPM


* .See previous concurrence-E' .CoDV with enclosures "N" -No coDYlOFFICE RI Tf RI E _I I BDS NAME TWesterman
NAME          TKoshy                      EFGoodwin*                                           AChaffee                  DMCrutchfi eld


CMyers _ _ _ TP Gwyn* SAl exander DATE / /95 1 I / /9 IL/5 01_/25/95  
DATE        I /oF/9              _       10/04/95                 / /95                        / /95                   / /95 OFFICIAL RECORD COPY
/ /95 OFFICE lTECH ED N SC:SIB:DISP


E EELB:DE E SC:EELB:DE
IK                                              'I


I E lC:EELB:DEl
IN 95-XX


E NAME l RSanders SKMi tra ASGill* JJACalvo*DATE l09/21/95*
September xx, 1995 This information notice requires no specific action or written response. If
/ /95 I / 1/96 09/21/95 9/27/95 OFFICE JIPECB:DRPM


PECB:DRPM
you have any questions about the information in this notice, please contact


I C:PECB:DRPMl
one of the technical contacts listed below or the appropriate Office of


D:DRPM NAME TKoshy EFGoodwin*
Nuclear Reactor Regulation (NRR) project manager.
AChaffee DMCrutchfi


eld DATE I /oF/9 _ 10/04/95 / /95 / /95 / /95 OFFICIAL RECORD COPY
Dennis M. Crutchfield, Director


IK 'I IN 95-XX September
Division of Reactor Program Management


xx, 1995 This information
Office of Nuclear Reactor Regulation


notice requires no specific action or written response.
Technical contacts:              Tom Westerman, RIV                                Christopher Myers, RIV


If you have any questions
(817) 860-8145                                    (817) 860-8144 Stephen Alexander, NRR                            Sikhindra Mitra, NRR


about the information
(301) 415-2995                                    (301) 415-2783 Attachment:        List of Recently Issued NRC Information Notices


in this notice, please contact one of the technical
DOCUMENT NAME:          95-XX.IN                                          *  *  See previous concurrence


contacts listed below or the appropriate
Te raclva a etonw of thb document Indicate hI Om box: 'C' - Copv without enclosures 'E - Copy with enclosures 'N- - No copy


Office of Nuclear Reactor Regulation (NRR) project manager.Dennis M. Crutchfield, Director Division of Reactor Program Management
OFFICE        R                  E RIV                    E R                              RIV              E PSIB:DISP      E


===Office of Nuclear Reactor Regulation===
NAME          TWesterman c              CMyers                    /                        T/5 6_      n      SAlexander
Technical


contacts: Tom Westerman, RIV (817) 860-8145 Christopher
_      _w


Myers, (817) 860-8144 RIV Stephen Alexander, NRR (301) 415-2995 Sikhindra
DATE          I /Teean/95  jC/1y/95                              / /95              _      T/ZS/95              I /95 OFFICE        TECH ED              N SC:SIB:DISP l                      DEE            E    SC:EELB:DE      E C:EELB:DE E


Mitra, NRR (301) 415-2783 Attachment:
NAME          RSanders                                          SKMitra*                      ASGill*              JACalvo*
List of Recently Issued NRC Information
DATE          09/21/95*                    / /95              09/20/95                      09/21/95                / /95 OFFICE        PECB:DRPM        I E PECB:DRPM /                l-JLIPEIBhRPM            IZC:PECB:DRPM              ID:DRPM


Notices DOCUMENT NAME: 95-XX.IN Te raclva a etonw of thb document Indicate hI Om box: 'C' -Copv without enclosures
NAME         TKoshy                    EFGoodwin              RJK                          AChaffee              DMCrutchfield


*
DATE          9/26/95                      y 95                  V //                          /95                /    /95 OFFICIAL RECORD COPY
* See previous concurrence


'E -Copy with enclosures
IN 95-XX


'N- -No copy OFFICE R E RIV E R RIV E PSIB:DISP
September xx, 1995 This information notice requires no specific action or written response. If


E NAME TWesterman
you have any questions about the information in this notice, please contact


c CMyers / T/5 6_ _ _w n SAlexander
one of the technical contacts listed below or the appropriate Office of


DATE I /Teean/95 jC/1y/95 / /95 _ T/ZS/95 I /95 OFFICE TECH ED N SC:SIB:DISP
Nuclear Reactor Regulation (NRR) project manager.


l DEE E SC:EELB:DE
Brian K. Grimes, Deputy Director


E C:EELB:DE
Division of Reactor Program Management


E NAME RSanders SKMitra* ASGill* JACalvo*DATE 09/21/95*
Office of Nuclear Reactor Regulation
/ /95 09/20/95 09/21/95 / /95 OFFICE PECB:DRPM


I E PECB:DRPM
Technical Contacts:               Tom Westerman, RIV


/ l-JLIPEIBhRPM
(817) 860-8145 Christopher Myers, RIV


IZ C:PECB:DRPM
(817) 860-8144 Stephen Alexander, NRR


ID:DRPM NAME TKoshy EFGoodwin
(301) 415-2995 Sikhindra Mitra, NRR


===RJK AChaffee DMCrutchfield===
(301) 415-2783 Attachment:        List of Recently Issued NRC Information Notices
DATE 9/26/95 y 95 V // /95 / /95 OFFICIAL RECORD COPY


IN 95-XX September
DOCUMENT NAME:          95-XX.IN                                        * , See previous concurrence


xx, 1995 This information
To receive a copy of this document. Indicate In the box: 'C' Copy without enclosures  E' - Copy with enclosures  N - No copy


notice requires no specific action or written response.
OFFICE        RIY        I          E    RIY              E    RIV


If you have any questions
RIYE                                          E  PSIB:DISP    E


about the information
NAME          TWesterman                  CMyers                ____                  _                          SAlexander


in this notice, please contact one of the technical
DATE            / /LE95                      / /95                  I /95                        /95                / /95 OFFICE        TECH ED            I N SC:SIB:DISP              E EELB:DE              I E    SC:EELB:DEl E C:EELB:DEI E


contacts listed below or the appropriate
NAME          RSanders                                          SKMitra*                    ASGill*                JACalvo I/ACj


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Deputy Director Division of Reactor Program Management
DATE          09/21/95*                      / /95              09/20/95                    09/21/95                f /17/95 qI~d'3 OFFICE        PECB:DRPM          l        C:PECB:DRPM l        DD:DRPM


===Office of Nuclear Reactor Regulation===
NAME                                      AChaffee              BKGrimes
Technical


Contacts:
DATE            I /95                        / /95                                                                                  l//
Tom Westerman, RIV (817) 860-8145 Christopher
                                    OFFICIAL RECORD COPY


Myers, RIV (817) 860-8144 Stephen Alexander, NRR (301) 415-2995 Sikhindra
i


Mitra, NRR (301) 415-2783 Attachment:
IN 95-XX
List of Recently Issued NRC Information


Notices DOCUMENT NAME: 95-XX.IN * , See previous concurrence
August XX, 1995 one of the technical contacts listed below or the appropriate Office of


To receive a copy of this document.
Nuclear Reactor Regulation (NRR) project manager.


Indicate In the box: 'C' Copy without enclosures
Brian K. Grimes, Deputy Director


E' -Copy with enclosures
Division of Reactor Program Management


N -No copy OFFICE RIY I E RIY E RIYE RIV E PSIB:DISP
Office of Nuclear Reactor Regulation


E NAME TWesterman
Technical Contacts:          Tom Westerman, RIV


CMyers ____ _ SAlexander
(817) 860-8145 Christopher Myers, RIV


DATE / /LE95 / /95 I /95 /95 / /95 OFFICE TECH ED I N SC:SIB:DISP
(817) 860-8144 Stephen Alexander, NRR


E EELB:DE I E SC:EELB:DEl
(301) 415-2995 Sikhindra Mitra, NRR


E C:EELB:DEI
(301) 415-2783 Attachment:     List of Recently Issued NRC Information Notices


E NAME RSanders SKMitra* ASGill* JACalvo I/ACj DATE 09/21/95*  
DOCUMENT NAME:        95-XX.IN                                            * . See previous concurrence
/ /95 09/20/95 09/21/95 f /17/95 qI~d'3 OFFICE PECB:DRPM


l C:PECB:DRPM
To rAceivA a Cf nv    donument. indicate Inthe box: 'C'
                    thids                                -  Coov without enclosures 'E' - Copy with enclosures 'N' . No copy


l DD:DRPM NAME AChaffee BKGrimes DATE I /95 / /95 l//95 OFFICIAL RECORD COPY
l1El                              R                    EE    RIV


IN 95-XX August XX, 1995 one of the technical
RE              I E lPSIB:DISP I E


contacts listed below or the appropriate
OFFICE


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Deputy Director Division of Reactor Program Management
NAME


===Office of Nuclear Reactor Regulation===
DATE
Technical


Contacts: Tom Westerman, RIV (817) 860-8145 Christopher
RIV


Myers, RIV (817) 860-8144 Stephen Alexander, NRR (301) 415-2995 Sikhindra
TWesterman


Mitra, NRR (301) 415-2783 Attachment:
/ /95 t
List of Recently Issued NRC Information


Notices DOCUMENT NAME: 95-XX.IN a nv Cf thids donument.
CMyers


indicate In the box:* .See previous concurrence
I /95 ISAlexander


'C' -Coov without enclosures
/    /95                      /95                    /95 OFFICE        TECH ED            N    SC:SIB:DISP I E EELB:DE                          E  SC:EELB-DE          E  C:EELB:DEl E


'E' -Copy with enclosures
NAME          BCalure                                          SKMitra YOM&                ASGill t                JACalvo


'N' .No copy To rAceivA OFFICE RIV l1 El t E RE R E RIV I E lPSIB:DISP
DATE          08/03/95*                j-/ /95                      / O/95                    /04/95                  / /95 OFFICE         PECB:DRPM      l        C:PECB:DRPMT            DD:DRPM


I E NAME TWesterman
NAME                                   AChaffee                BKGrimes


===CMyers ISAlexander===
DATE             I /95                   / /95                   / /95 OFFICIAL      RECORD    COPY
DATE / /95 I /95 / /95 /95 /95 OFFICE TECH ED N SC:SIB:DISP


I E EELB:DE E SC:EELB-DE
K-/
                                                                                                  IN 95-XX


E C:EELB:DEl
August XX, 1995 one of the technical contacts listed below or the appropriate Office of


E NAME BCalure SKMitra YOM& ASGill t JACalvo DATE 08/03/95*
Nuclear Reactor Regulation (NRR) project manager.
j-/ /95 / O/95 /04/95 / /95 OFFICE PECB:DRPM


l C:PECB:DRPMT
Brian K. Grimes, Deputy Director


DD:DRPM NAME AChaffee BKGrimes DATE I /95 / /95 / /95 OFFICIAL RECORD COPY
Division of Reactor Program Management


K-/IN 95-XX August XX, 1995 one of the technical
Office of Nuclear Reactor Regulation


contacts listed below or the Nuclear Reactor Regulation (NRR) project manager.appropriate
Technical Contacts:              Tom Westerman, RIV


Office of Brian K. Grimes, Deputy Director Division of Reactor Program Management
(817) 860-8145 Christopher Myers, RIV


===Office of Nuclear Reactor Regulation===
(817) 860-8144 Stephen Alexander, NRR
Technical


Contacts: Tom Westerman, RIV (817) 860-8145 Christopher
(301). 415-2995 Sikhindra Mitra, NRR


Myers, RIV (817) 860-8144 Stephen Alexander, NRR (301). 415-2995 Sikhindra
(301) 415-2783 Attachment:          List of Recently Issued NRC Information Notices


Mitra, NRR (301) 415-2783 Attachment:
DOCUMENT NAME:          95-XX.IN                                            *  =  See previous concurrence
List of Recently Issued NRC Information


Notices DOCUMENT NAME: 95-XX.IN To receive a copy of this document.
To receive a copy of this document. Indicate In the box: NCR - Copy without endosurms wEd - Copy with oncosurss  rW- No copy


Indicate In the box:* = See previous concurrence
OFFICE        RIV            I E RIY                          E    RIV                  E    RIV              I E    PSIB:DISP I E


wEd -Copy with oncosurss
NAME          TWesterman                  CMyers                  I                          jSAlexander


rW -No copy NCR -Copy without endosurms OFFICE RIV I E RIY E RIV E RIV I E PSIB:DISP
DATE            / /95                        / /95                1/. /95                            /95                  / /95 OFFICE       TECH ED              N SC:SIB:DISP I E               EELB:DE                E     SC:EELB:DE        E   C:EELB:DEI E


I E NAME TWesterman
NAME          BCalure K54a" 1SKMitra                                                            ASGill                  JACalvo      I


===CMyers I jSAlexander===
DATE         08/03/95* gf(gfIq / /95                                 / /95                           /95                 / /95 OFFICE       PECB:DRPM                  C:PECB:DRPM              DD:DRPM
DATE / /95 / /95 1/. /95 /95 / /95 OFFICE TECH ED N SC:SIB:DISP


I E EELB:DE E SC:EELB:DE
NAME


E C:EELB:DEI
DATE/                /95            1
                                        1AChaffee


E NAME BCalure K54a" 1SKMitra ASGill JACalvo I DATE 08/03/95*
/ /95 BKGrimes
gf(g fIq / /95 / /95 /95 / /95 OFFICE PECB:DRPM


C:PECB:DRPM
/ /95            II


DD:DRPM NAME 1AChaffee
_                                      l


BKGrimes _ lDATE/ /95 1 / /95 / /95 II OFFICIAL RECORD COPY}}
OFFICIAL RECORD COPY}}


{{Information notice-Nav}}
{{Information notice-Nav}}

Latest revision as of 04:37, 24 November 2019

Preconditioning of Molded-Case Circuit Breakers Before Surveillance Testing
ML031060110
Person / Time
Site: Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Mcguire, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant  Entergy icon.png
Issue date: 04/25/1996
From: Grimes B
Office of Nuclear Reactor Regulation
To:
References
IN-96-024, NUDOCS 9604220229
Download: ML031060110 (14)
v • d • e


UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555-0001 April 25, 1996 NRC INFORMATION NOTICE 96-24: PRECONDITIONING OF MOLDED-CASE CIRCUIT BREAKERS

BEFORE SURVEILLANCE TESTING

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 to the detrimental effect that preconditioning of

molded-case circuit breakers could have on the diagnostic validity of

surveillance tests. It is expected that recipients will review this

information for applicability to their facilities and consider actions, as

appropriate, to avoid similar problbms. However, suggestions contained in

this information notice are not NRC requirements; therefore, no specific

action or written response is required.

DescriDtion of Circumstances

During an inspection at the Diablo Canyon Nuclear Power Plant (IR 50-275,

323/94-27 dated December 21, 1994), NRC inspectors noted that the licensee

preconditioned circuit breakers before performing surveillance testing.

Before the overcurrent trip testing, Diablo Canyon staff exercised the circuit

breakers by manually opening and closing them three times. The plant staff

'did not record the as-found condition of the breakers in terms of unexercised

trip currents and times.

During another inspection at the South Texas Project (IR 50-498, 499/94-35 dated January 19, 1995), NRC inspectors noted that the licensee exercised

similar circuit breakers manually at least five times before testing the

overcurrent trip unit.

Discussion

A molded-case circuit breaker is one of the most widely used protective

devices for electrical circuits at nuclear power plants. Its proper operation

is essential for the protection and safe operation of plant electrical

equipment. Many circuit breakers are continuously energized for long periods.

Often they are in service for years and are rarely, if ever, called upon to

perform a protective function. Nevertheless, when needed, they must rapidly

isolate a faulted or overloaded circuit to prevent equipment damage.

Therefore, for the safe operation of the electrical distribution system

equipment of a nuclear power plant, it is important to periodically verify

their continued reliability.

.K

VE uor~cEya-0OZ %6qZ 'I

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IN 96-24 April 25, 1996 Periodic inspection and testing of circuit breakers in their as-found

condition is an appropriate way of demonstrating the functional operability of

the breaker and of detecting any degradation. However, the practice of

preconditioning before testing (e.g., lubricating pivot points and manually

cycling the breaker) defeats the purpose of the periodic test. Such

preconditioning does not confirm continued operability between tests nor does

it provide information on the condition of the circuit breaker for trending

purposes. Testing some circuit breakers in the as-found condition can provide

useful data on which to base decisions on surveillance intervals and the

ability of the untested circuit breakers to perform their intended function.

Since only a fraction of the circuit breakers are tested each refueling outage

to justify the operability of the remaining circuit breakers, preconditioning

before testing does not provide the expected assurance of the operability of

remaining breakers which are not tested. By preconditioning circuit breakers, useful information may be lost because the breaker may not have been capable

of performing its intended function without preconditioning.

To correct this situation, Diablo Canyon Power Plant plans to revise the

electrical maintenance procedure before the next surveillance test has to be

performed. The revised procedures will state that electrical testing should

be performed before any intentional manual exercising of the breakers, and to

ensure that electrical testing on breakers with removable trip units is

performed before removing the trip unit.

Some plants have older technical specification bases that cite National

Electrical Manufacturers Association (NEMA) Standard AB 2-1980. This version

of the standard specifies mechanical cycling of circuit breakers prior to

electrical testing. In later versions of this standard, this procedure was

deleted. There appears to be no valid technical need for mechanical cycling

prior to electrical surveillance testing.

The NRC has issued other generic communications on molded-case circuit breaker

applications and testing: NRC Information Notice (IN) 92-51, and its

Supplement 1, "Misapplication and Inadequate Testing of Molded-Case Circuit

Breakers;" IN 93-26, "Grease Solidification Causes Molded Case Circuit Breaker

Failure to Close;" and IN 93-64, "Periodic Testing and Preventive Maintenance

of Molded-Case Circuit Breakers."

If I

IN 96-24 April 25, 1996 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager. /a

L.."

Brian K. Grimes, Acting Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical contacts: Sikhindra Mitra, NRR

(301) 415-2783 Internet:skml@nrc.gov

Steve Alexander, NRR

(301) 415-2995 Internet:sda@nrc.gov

Christopher Myers, RIV

(817) 860-8144 Internet:cjm@nrc.gov

Attachment: List of Recently Issued NRC Information Notices

-tw@ / "Y

K

Attachment

IN 96-24 April 25, 1996 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information Date of

Notice No. Subject Issuance Issued to

96-23 Fires in Emergency Diesel 04/22/96 All holders of OLs or CPs

Generator Exciters During for nuclear power reactors

Operation Following Unde- tected Fuse Blowing

96-22 Improper Equipment Set- 04/11/96 All holders of OLs or CPs

tings Due to the Use of for nuclear power reactors

Nontemperature-Compensated

Test Equipment

96-21 Safety Concerns Related 04/10/96 All U.S. NRC Medical to the

to the Design of the Door Licensees authorized to use

Interlock Circuit on brachytherapy sources in

Nucletron High-Dose Rate high- and pulsed-dose-rate

and Pulsed Dose Rate remote afterloaders

Remote Afterloading

Brachytherapy Devices

96-20 Demonstration of Associ- 04/04/96 All industrial radiography

ated Equipment Compliance licensees and radiography

with 10 CFR 34.20 equipment manufacturers

96-19 Failure of Tone Alert 04/02/96 All holders of OLs or CPs

Radios to Activate When for nuclear power reactors

Receiving a Shortened

Activation Signal

96-18 Compliance with 10 CFR 03/25/96 All material licensees

Part 20 for Airborne authorized to possess and

Thorium use thorium in unsealed

form

95-03 Loss of Reactor Coolant 03/25/96 All holders of OLs or CPs

Supp. 1 Inventory and Potential for PWR power plants

Loss of Emergency Mitiga- tion Functions While in a

Shutdown Condition

OL = Operating License

CP - Construction Permit

K2 2 IN 96-24 April 25, 1996 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

original signed by

Brian K. Grimes, Acting Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical contacts: Sikhindra Mitra, NRR

(301) 415-2783 Internet:skml@nrc.gov

Steve Alexander, NRR

(301) 415-2995 Internet:sda@nrc.gov

Christopher Myers, RIV

(817) 860-8144 Internet:cjm@nrc.gov

Attachment: List of Recently Issued NRC Information Notices

DOCUMENT NAME: 96-24.IN Tech Editor reviewed 9/21/95 To receive a copy of this document, Indicate In the box: 'C' - Copy without enclosures 'E" = Copy with sncloRre -l = No copy

OFFICE Contacts C IEELB

NAME CMyers * JCalvo * AChatfee s

SMitra * /

SAlexander* 7 ,

DATE 4/22/96 4/15/96 4/22/96 4/LT/96 OFFICIAL RECORD COPY

IN 96-XX

April XX, 1996 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Dennis M. Crutchfield, Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical contacts: Sikhindra Mitra, NRR Christopher Myers, RIV

(301) 415-2783 (817) 860-8144 Internet: skmlnrc.gov Internet: cjm@nrc.gov

Steve Alexander, NRR

(301) 415-2995 Internet: sda@nrc.gov

Attachment: List of Recently Issued NRC Information Notices

DOCUMENT NAME: 95-XX.IN Tech Editor reviewed 9/21/95 To receive a copy of this document. Indicate In the box: 'C' - Copy without enclosures fEw - Copy with enclosures 'N' - No copy

OFFICE IContacts C/EELB D/DRPI lI

NAME CMyers * JCalvo * AChaffee DCrutchfield

SMitra *

SAlexanderLnfi_

DATE 4 /15/96 7' 4/15/96 4/ /96 4/ /96

. - - - - - - -

UICLIAL KECOKR COPY

,44

I 1 i

<-' IN 96-XX

April XX, 1996 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Dennis M. Crutchfield, Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical contacts: Sikhindra Mitra, NRR Christopher Myers, RIV

(301) 415-2783 (817) 860-8144 Internet: skmlnrc.gov Internet: cjm~nrc.gov

Attachment: List of Recently Issued NRC Information Notices

DOCUMENT NAME: 95-XX.IN Tech Editor reviewed 9/21/95 To receive a copy of this document, Indicate In the box: 'C' - Copy without enclosures 'E' - Copy with enclosures 'No = No copy

lOFFICE Contacts I C/EELB l C/PECB I DRPM I

NAME CMyers * JCalvo * AChaffee DCrutchfield

SMitra *

DATE 4 /I5/96 4/11 /96 4/ 4/ /96 OFFICIAL RECORD COPY

IN 96-XX

April XX, 1996 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Dennis M. Crutchfield, Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical contacts: Christopher Myers, RIV

(817) 860-8144 Sikhindra Mitra, NRR

(301) 415-2783 Attachment: List of Recently Issued NRC Information Notices

DOCUMENT NAME: 95-XX.IN Tech Editor reviewed 9/21/95 To receive a copy of this document. Indicate In the box: wCw = Copy without enclosures 'E" - Copy with enclosures 'N'= No copy

OFFICE Contacts C/EELB I

NAME Myers JCalvoJy r AChaffee DCrutchfield

I ~SMi tra_ _ _ _ _ _ _

DATE 4 /16796 4/ I7/96 4/ /96 4/ /96 OFFICIAL RECORD COPY

IN 96-XX

April xx, 1996 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Dennis M. Crutchfield, Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical contacts: Tom Westerman, RIV Christopher Myers, RIV

(817) 860-8145 (817) 860-8144 Stephen Alexander, NRR Sikhindra Mitra, NRR

(301) 415-2995 (301) 415-2783 Attachment: List of Recently Issued NRC Information Notices

DOCUMENT NAME: 95-XX.IN * . See previous concurrence

  • wprs

T 5 .LL.1. .I i *k.hn,.. tC =-Cnnu without enclosures,

........................... =E' CoDv with enclosures 'N' = No copy

rcv r^uumn, juciva lwi'Jw. -r,.

OFFICE RIV liE RIV E lRIV l E RIV E PSIB:DISP E

NAME LTWesterman A CMyers k _ TP Gwyn* SAlexander

DATE I1/ g/95 t /,/95 / /95 01/25/95 / /95 OFFICE TECH ED N SC:SIB:DISP l EE:DE E SC:EELB:DE E C:EELB:DEl E

NAME WRSanders SKMitra 't ASGill* JACalvo*

DATE 109/21/95* / /95 41,1/2o%96 I/Y.1 09/21/95 9/27/95 OFFICE IPECB:DRPM PECB:DRPM PECB:DRPM I C:PECB:DRPM l D:DRPM

NAME JTKoshy EFGoodwin* AChaffee DMCrutchfield

DATE IJ/f/96 10/04/95 I /95 /95 /95 OFFICIAL RECORD COPY

IN 96-XX

January xx, 1995 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Dennis M. Crutchfield, Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical contacts: Tom Westerman, RIV Christopher Myers, RIV

(817) 860-8145 (817) 860-8144 Stephen Alexander, NRR Sikhindra Mitra, NRR

(301) 415-2995 (301) 415-2783 Attachment: List of Recently Issued NRC Information Notices

DOCUMENT NAME: 95-XX.IN * . See previous concurrence

To receive a copv ol this document. indicate Inthe box: C - Coov without enclosures .

-E' CoDV with enclosures "N" - No coDY

lOFFICE RI Tf RI E I BDS _I

NAME TWesterman CMyers _ _ _ TP Gwyn* SAl exander

DATE / /95 1 I / /9 IL/5 01_/25/95 / /95 OFFICE lTECH ED N SC:SIB:DISP E EELB:DE E SC:EELB:DE I E lC:EELB:DEl E

NAME l RSanders SKMi tra ASGill* JJACalvo*

DATE l09/21/95* / /95 I / 1/96 09/21/95 9/27/95 OFFICE JIPECB:DRPM PECB:DRPM I C:PECB:DRPMl D:DRPM

NAME TKoshy EFGoodwin* AChaffee DMCrutchfi eld

DATE I /oF/9 _ 10/04/95 / /95 / /95 / /95 OFFICIAL RECORD COPY

IK 'I

IN 95-XX

September xx, 1995 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Dennis M. Crutchfield, Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical contacts: Tom Westerman, RIV Christopher Myers, RIV

(817) 860-8145 (817) 860-8144 Stephen Alexander, NRR Sikhindra Mitra, NRR

(301) 415-2995 (301) 415-2783 Attachment: List of Recently Issued NRC Information Notices

DOCUMENT NAME: 95-XX.IN * * See previous concurrence

Te raclva a etonw of thb document Indicate hI Om box: 'C' - Copv without enclosures 'E - Copy with enclosures 'N- - No copy

OFFICE R E RIV E R RIV E PSIB:DISP E

NAME TWesterman c CMyers / T/5 6_ n SAlexander

_ _w

DATE I /Teean/95 jC/1y/95 / /95 _ T/ZS/95 I /95 OFFICE TECH ED N SC:SIB:DISP l DEE E SC:EELB:DE E C:EELB:DE E

NAME RSanders SKMitra* ASGill* JACalvo*

DATE 09/21/95* / /95 09/20/95 09/21/95 / /95 OFFICE PECB:DRPM I E PECB:DRPM / l-JLIPEIBhRPM IZC:PECB:DRPM ID:DRPM

NAME TKoshy EFGoodwin RJK AChaffee DMCrutchfield

DATE 9/26/95 y 95 V // /95 / /95 OFFICIAL RECORD COPY

IN 95-XX

September xx, 1995 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Brian K. Grimes, Deputy Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical Contacts: Tom Westerman, RIV

(817) 860-8145 Christopher Myers, RIV

(817) 860-8144 Stephen Alexander, NRR

(301) 415-2995 Sikhindra Mitra, NRR

(301) 415-2783 Attachment: List of Recently Issued NRC Information Notices

DOCUMENT NAME: 95-XX.IN * , See previous concurrence

To receive a copy of this document. Indicate In the box: 'C' Copy without enclosures E' - Copy with enclosures N - No copy

OFFICE RIY I E RIY E RIV

RIYE E PSIB:DISP E

NAME TWesterman CMyers ____ _ SAlexander

DATE / /LE95 / /95 I /95 /95 / /95 OFFICE TECH ED I N SC:SIB:DISP E EELB:DE I E SC:EELB:DEl E C:EELB:DEI E

NAME RSanders SKMitra* ASGill* JACalvo I/ACj

DATE 09/21/95* / /95 09/20/95 09/21/95 f /17/95 qI~d'3 OFFICE PECB:DRPM l C:PECB:DRPM l DD:DRPM

NAME AChaffee BKGrimes

DATE I /95 / /95 l//

OFFICIAL RECORD COPY

i

IN 95-XX

August XX, 1995 one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Brian K. Grimes, Deputy Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical Contacts: Tom Westerman, RIV

(817) 860-8145 Christopher Myers, RIV

(817) 860-8144 Stephen Alexander, NRR

(301) 415-2995 Sikhindra Mitra, NRR

(301) 415-2783 Attachment: List of Recently Issued NRC Information Notices

DOCUMENT NAME: 95-XX.IN * . See previous concurrence

To rAceivA a Cf nv donument. indicate Inthe box: 'C'

thids - Coov without enclosures 'E' - Copy with enclosures 'N' . No copy

l1El R EE RIV

RE I E lPSIB:DISP I E

OFFICE

NAME

DATE

RIV

TWesterman

/ /95 t

CMyers

I /95 ISAlexander

/ /95 /95 /95 OFFICE TECH ED N SC:SIB:DISP I E EELB:DE E SC:EELB-DE E C:EELB:DEl E

NAME BCalure SKMitra YOM& ASGill t JACalvo

DATE 08/03/95* j-/ /95 / O/95 /04/95 / /95 OFFICE PECB:DRPM l C:PECB:DRPMT DD:DRPM

NAME AChaffee BKGrimes

DATE I /95 / /95 / /95 OFFICIAL RECORD COPY

K-/

IN 95-XX

August XX, 1995 one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Brian K. Grimes, Deputy Director

Division of Reactor Program Management

Office of Nuclear Reactor Regulation

Technical Contacts: Tom Westerman, RIV

(817) 860-8145 Christopher Myers, RIV

(817) 860-8144 Stephen Alexander, NRR

(301). 415-2995 Sikhindra Mitra, NRR

(301) 415-2783 Attachment: List of Recently Issued NRC Information Notices

DOCUMENT NAME: 95-XX.IN * = See previous concurrence

To receive a copy of this document. Indicate In the box: NCR - Copy without endosurms wEd - Copy with oncosurss rW- No copy

OFFICE RIV I E RIY E RIV E RIV I E PSIB:DISP I E

NAME TWesterman CMyers I jSAlexander

DATE / /95 / /95 1/. /95 /95 / /95 OFFICE TECH ED N SC:SIB:DISP I E EELB:DE E SC:EELB:DE E C:EELB:DEI E

NAME BCalure K54a" 1SKMitra ASGill JACalvo I

DATE 08/03/95* gf(gfIq / /95 / /95 /95 / /95 OFFICE PECB:DRPM C:PECB:DRPM DD:DRPM

NAME

DATE/ /95 1

1AChaffee

/ /95 BKGrimes

/ /95 II

_ l

OFFICIAL RECORD COPY


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