Information Notice 1993-95, Storm-Related Loss of Offsite Power Events Due to Salt Buildup on Switchyard Insulators: 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 December 13, 1993 NRC INFORMATION


NOTICE 93-95: STORM-RELATED
WASHINGTON, D.C. 20555 December 13, 1993 NRC INFORMATION NOTICE 93-95:   STORM-RELATED LOSS OF OFFSITE POWER EVENTS


LOSS OF OFFSITE POWER EVENTS DUE TO SALT BUILDUP ON SWITCHYARD
DUE TO SALT BUILDUP ON SWITCHYARD INSULATORS
 
INSULATORS


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


licensees
reactors located close to a large body of salt water.


or construction
PurDose


permits for nuclear power reactors located close to a large body of salt water.PurDose 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 potential for loss of offsite power due to


notice to alert addressees
salt contamination of switchyard insulators. It is expected that recipients


to the potential
will review the information for applicability to their facilities and consider


for loss of offsite power due to salt contamination
actions, as appropriate, to avoid similar problems. However, no specific


of switchyard
action or written response is required.


insulators.
==Description of Circumstances==
On March 17, 1993, the Florida Power Corporation Crystal River Unit 3 experienced a loss of the 230 kV switchyard (normal offsite power to safety- related busses) when a light rain caused arcing across salt-laden 230 kV


===It is expected that recipients===
insulators and opened breakers in the switchyard. At the time, the unit was
will review the information


for applicability
in cold shutdown during a maintenance outage. The 'Al emergency diesel


to their facilities
generator was used to power safety-related loads including shutdown cooling


and consider actions, as appropriate, to avoid similar problems.
until the 230 kV switchyard was restored. The ABE emergency diesel generator


However, no specific action or written response is required.Description
was unavailable due to maintenance. The 500 kV switchyard supplied nonvital


of Circumstances
loads throughout the event.


On March 17, 1993, the Florida Power Corporation
On March 16 through 18, 1993, Carolina Power and Light Company's Brunswick


Crystal River Unit 3 experienced
Units 1 and 2 experienced a loss of the 230 kV switchyards (all offsite power)
when light rain caused arcing across salt-laden insulators and opened breakers


a loss of the 230 kV switchyard (normal offsite power to safety-related busses) when a light rain caused arcing across salt-laden
in the switchyard. At the time, both units were in cold shutdown during an


230 kV insulators
extended outage. Emergency diesel generators were used to power safety- related loads including shutdown cooling until the offsite power was restored.


and opened breakers in the switchyard.
Since 1982, the Boston Edison Company Pilgrim station has also experienced


At the time, the unit was in cold shutdown during a maintenance
several loss of offsite power events when heavy ocean storms deposited salt on


outage. The 'Al emergency
the 345 kV switchyard causing the insulators to arc to ground.


diesel generator
9312070298 LAe~ffL.A~1241{3/f3P


was used to power safety-related
tE


loads including
X1P4        N4 e, 93-95*                777


shutdown cooling until the 230 kV switchyard
k IN 93-95 K>
                                                            December 13, 1993 Discussion


was restored.
Intense and unusual storms on March 13 and 14, 1993, produced high tides and


The ABE emergency
high winds (average of 80 to 97 kilometers/hour high winds (50 to 60
miles/hour], with gusts up to 160 kilometers/hour [100 miles/hour] blowing


diesel generator was unavailable
ashore from the ocean i.e., Gulf of Mexico and Atlantic Ocean. These storms


due to maintenance.
caused an unusual buildup of salt on the switchyard insulators at


The 500 kV switchyard
Crystal River Unit 3 and Brunswick Units 1 and 2. The storms were unusual in


supplied nonvital loads throughout
that they included high winds but little or no precipitation. As a result, salt from ocean spray built up on the switchyard insulators and was not washed


the event.On March 16 through 18, 1993, Carolina Power and Light Company's
away by rain.


Brunswick Units 1 and 2 experienced
Days later, light rain increased the electrical conductivity of the salt, resulting in arcing across the insulators at both sites. To remove the salt


a loss of the 230 kV switchyards (all offsite power)when light rain caused arcing across salt-laden
from the insulators, Florida Power Corporation and Carolina Power and Light


insulators
Company deenergized the affected switchyards, washed the insulators with high


and opened breakers in the switchyard.
pressure demineralized water, then returned the switchyards to service. The


At the time, both units were in cold shutdown during an extended outage. Emergency
washing stopped the electrical arcing across the insulators.


diesel generators
The 500 kV switchyard for Crystal River Unit 3 is located adjacent to the


were used to power safety-related loads including
230 kV switchyard. It was relatively unaffected. The 500 kV switchyard is


shutdown cooling until the offsite power was restored.Since 1982, the Boston Edison Company Pilgrim station has also experienced
used for main generator output when Unit 3 is operating and is used for an


several loss of offsite power events when heavy ocean storms deposited
alternate source of offsite power (i.e., backfeeding of nonvital loads) during


salt on the 345 kV switchyard
Unit 3 outages. The 500 kV switchyard experienced less arcing across the


causing the insulators
insulators than the 230 kV switchyard and no tripped breakers. As a


to arc to ground.9312070298
precautionary measure, the licensee also deenergized and washed the 500 kV
1P4 X tE N4 e, 9 3-95* 777 LAe~ffL.A~1241{3/f3P


K> k IN 93-95 December 13, 1993 Discussion
switchyard insulators. Factors that may have reduced the storm inpact on the


Intense and unusual storms on March 13 and 14, 1993, produced high tides and high winds (average of 80 to 97 kilometers/hour
500 kV switchyard included location (farther away from the shore) and higher


high winds (50 to 60 miles/hour], with gusts up to 160 kilometers/hour
insulation level (the 500 kV insulators were designed for up to 700 kV


[100 miles/hour]
operation while the 230 kV insulators were designed for up to 242 kV
blowing ashore from the ocean i.e., Gulf of Mexico and Atlantic Ocean. These storms caused an unusual buildup of salt on the switchyard


insulators
operation). In addition, the licensee observed that, of the two types of


at Crystal River Unit 3 and Brunswick
230 kV insulators installed, the newer post type had less arcing than the


Units 1 and 2. The storms were unusual in that they included high winds but little or no precipitation.
older cap and pin type.


As a result, salt from ocean spray built up on the switchyard
Licensee followup action in response to these events, to improve the future


insulators
performance of non-safety switchyard equipment, included: investigating


and was not washed away by rain.Days later, light rain increased
available salt buildup monitoring systems, evaluating insulator washing


the electrical
methods/capabilities, considering the use of room temperature vulcanized (RTV)
silicon rubber coatings, installing newer metal oxide gapless surge arrestors


conductivity
to replace older silicon carbide gap type surge arrestors, and replacing


of the salt, resulting
cellon-treated wood transmission towers.


in arcing across the insulators
The 345 kV switchyard insulators at Pilgrim were coated with RTV silicon


at both sites. To remove the salt from the insulators, Florida Power Corporation
rubber (Sylgard) in 1987. It was expected that the RTV coating, when applied


and Carolina Power and Light Company deenergized
in 1987, would be effective for a period of 15 years. However, actual


the affected switchyards, washed the insulators
experience at Pilgrim indicates that the coating is effective for a much


with high pressure demineralized
`-  IN 93-95 December 13, 1993 shorter period of time. Consequently, the Insulators at Pilgrim were cleaned


water, then returned the switchyards
and coated with RTV again during the spring 1993 refueling outage. As a long- term option, the licensee is considering a replacement of the existing 345 kV


to service. The washing stopped the electrical
switchyard with a modern compactly designed switchyard which would be more


arcing across the insulators.
resistant to the coastal environment.


The 500 kV switchyard
These events illustrate the significance of maintaining reliable offsite and


for Crystal River Unit 3 is located adjacent to the 230 kV switchyard.
onsite power sources during outages as well as during operation.


It was relatively
This information notice requires no specific action or written response. If


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


The 500 kV switchyard
one of the technical contacts listed below or the appropriate Office of


is used for main generator
Nuclear Regulation (NRR) project manager.


output when Unit 3 is operating
Bran . Grimes, Director


and is used for an alternate
Division of Operating Reactor Support


source of offsite power (i.e., backfeeding
Office of Nuclear Reactor Regulation


of nonvital loads) during Unit 3 outages. The 500 kV switchyard
Technical contacts:  R. Schin, RII          P. Fillion, RII


experienced
(404) 331-5561          (404) 331-7288 P. Holmes-Ray, RII      P. Kang, NRR


less arcing across the insulators
(904) 795-7677          (301) 504-2779 R. Prevatte, RII


than the 230 kV switchyard
(919) 457-9531 Attachment:


and no tripped breakers.
===List of Recently Issued NRC Information Notices===


As a precautionary
Attachment
 
measure, the licensee also deenergized
 
and washed the 500 kV switchyard
 
insulators.
 
Factors that may have reduced the storm inpact on the 500 kV switchyard
 
included location (farther away from the shore) and higher insulation
 
level (the 500 kV insulators
 
were designed for up to 700 kV operation
 
while the 230 kV insulators
 
were designed for up to 242 kV operation).
 
In addition, the licensee observed that, of the two types of 230 kV insulators
 
installed, the newer post type had less arcing than the older cap and pin type.Licensee followup action in response to these events, to improve the future performance
 
of non-safety
 
switchyard


equipment, included:
IN 93-95 December 13, 1993 LIST OF RECENTLY ISSUED
investigating


available
NRC INFORMATION NOTICES


salt buildup monitoring
Informati on                                  Date of


systems, evaluating
Notice No.            Subject                Issuance    Issued to


insulator
93-94          Unauthorized Forced            12/09/93    All holders of OLs or CPs


washing methods/capabilities, considering
Entry into the Pro-                        for nuclear power reactors.


the use of room temperature
tected Area at Three


vulcanized (RTV)silicon rubber coatings, installing
Mile Island Unit 1 on


newer metal oxide gapless surge arrestors to replace older silicon carbide gap type surge arrestors, and replacing cellon-treated
February 7, 1993
93-93          Inadequate Control of          12/08/93  All holders of OLs or CPs


wood transmission
Reactor Coolant System                    for nuclear power reactors.


towers.The 345 kV switchyard
Conditions During Shutdown


insulators
93-92          Plant Improvements to          12/07/93  All holders of OLs or CPs


at Pilgrim were coated with RTV silicon rubber (Sylgard)
Mitigate Common Depend-                    for nuclear power reactors.
in 1987. It was expected that the RTV coating, when applied in 1987, would be effective


for a period of 15 years. However, actual experience
encies in Component


at Pilgrim indicates
Cooling Water Systems


that the coating is effective
91-21,          Inadequate Quality            12/07/93    All holders of OLs or CPs


for a much
Supp. 1        Assurance Program of                      for nuclear power reactors


`- IN 93-95 December 13, 1993 shorter period of time. Consequently, the Insulators
Vendor Supplying                          and all recipients of


at Pilgrim were cleaned and coated with RTV again during the spring 1993 refueling
Safety-Related Equipment                  NUREG-0040, "License Con- tractor and Vendor Inspec- tion Status Report" (White


outage. As a long-term option, the licensee is considering
Book).


a replacement
89-77,        Debris in Containment          12/03/93    All holders of OLs or CPs


of the existing 345 kV switchyard
Supp. 1        Emergency Sumps and                        for nuclear power reactors.


with a modern compactly
Incorrect Screen


designed switchyard
Configurations


which would be more resistant
93-91          Misadjustment Between          12/03/93    All holders of OLs or CPs


to the coastal environment.
General Electric 4.16-KV                  for nuclear power reactors.
 
These events illustrate
 
the significance
 
of maintaining
 
reliable offsite and onsite power sources during outages as well as during operation.
 
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 Regulation (NRR) project manager.Bran .Grimes, Director Division of Operating
 
===Reactor Support Office of Nuclear Reactor Regulation===
Technical
 
contacts: R. Schin, RII (404) 331-5561 P. Fillion, RII (404) 331-7288 P. Holmes-Ray, RII (904) 795-7677 P. Kang, NRR (301) 504-2779 R. Prevatte, RII (919) 457-9531 Attachment:
List of Recently Issued NRC Information
 
Notices
 
Attachment


IN 93-95 December 13, 1993 LIST OF RECENTLY ISSUED NRC INFORMATION
Circuit Breakers and Their


NOTICES Informati
Associated Cubicles


on Date of Notice No. Subject Issuance Issued to 93-94 93-93 93-92 91-21, Supp. 1 89-77, Supp. 1 93-91 Unauthorized
93-90          Unisolatable Reactor          12/01/93   All holders of OLs or CPs


Forced Entry into the Pro-tected Area at Three Mile Island Unit 1 on February 7, 1993 Inadequate
Coolant System Leak                        for nuclear power reactors.


Control of Reactor Coolant System Conditions
Following Repeated


During Shutdown Plant Improvements
Applications of Leak


to Mitigate Common Depend-encies in Component Cooling Water Systems Inadequate
Sealant


Quality Assurance
OL - Operating License


Program of Vendor Supplying Safety-Related
CP - Construction Permit


===Equipment Debris in Containment===
IN 93-95 December 13, 1993 shorter period of time. Consequently, the Insulators at Pilgrim were cleaned
Emergency


Sumps and Incorrect
and coated with RTV again during the spring 1993 refueling outage. As a long- term option, the licensee is considering a replacement of the existing 345 kV


===Screen Configurations===
switchyard with a modern compactly designed switchyard which would be more
Misadjustment


Between General Electric 4.16-KV Circuit Breakers and Their Associated
resistant to the coastal environment.


Cubicles Unisolatable
These events Illustrate the significance of maintaining reliable offsite and


Reactor Coolant System Leak Following
onsite power sources during outages as well as during operation.


Repeated Applications
This information notice requires no specific action or written response. If


of Leak Sealant 12/09/93 12/08/93 12/07/93 12/07/93 12/03/93 12/03/93 12/01/93 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
you have any questions about the information in this notice, please contact


of NUREG-0040, "License Con-tractor and Vendor Inspec-tion Status Report" (White Book).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.93-90 OL -Operating
one of the technical contacts listed below or the appropriate Office of


License CP -Construction
Nuclear Regulation (NRR) project manager.


Permit
OgItf Ognefw    5 Brian K. Grimeg


IN 93-95 December 13, 1993 shorter period of time. Consequently, the Insulators
Brian K. Grimes, Director


at Pilgrim were cleaned and coated with RTV again during the spring 1993 refueling
Division of Operating Reactor Support


outage. As a long-term option, the licensee is considering
Office of Nuclear Reactor Regulation


a replacement
Technical contacts:          R. Schin, RII            P. Fillion, RII


of the existing 345 kV switchyard
(404) 331-5561            (404) 331-7288 P. Holmes-Ray, RII        P. Kang, NRR


with a modern compactly
(904) 795-7677            (301) 504-2779 R. Prevatte, RII


designed switchyard
(919) 457-9531 Attachment:


which would be more resistant
===List of Recently Issued NRC Information Notices===
*SEE PREVIOUS CONCURRENCE


to the coastal environment.
OFFICE      *RII                  *TECH ED        *EELB            *C:EELB:NRR


These events Illustrate
NAME        RSchin                JBeeson          PKang            CBerlinger


the significance
DATE            _07/13/93        08/09/93        11/03/93            /03/93 I_                                                      1077    1 nlnr              *OGCB!DORS            *C:OGCB:DORS


of onsite power sources during outages as well maintaining
JTWiggins        NECampbell            GHMarcus    /      /IIIl


reliable offsite and as during operation.
11/04/93          11/18/93            11/23/93          12/1'5/93
1LOUMtNi  NAIt: Ns-V*.zN


This information
IN 93-XX


notice requires no specific action or written response.
December xx, 1993 shorter period of time. Consequently, the insulators at Pilgrim were cleaned


If you have any questions
and coated with protective RTV coating again during the spring 1993 refueling


about the information
outage. As an alternate long term option, the licensee is considering a


in this notice, please contact one of the technical
replacement of the existing 345 kV switchyard with a modern compactly designed


contacts listed below or the appropriate
switchyard which would be more resistant to the coastal environment.


Office of Nuclear Regulation (NRR) project manager.OgItf Ognefw 5 Brian K. Grimeg Brian K. Grimes, Director Division of Operating
These events illustrate the significance of maintaining reliable offsite and


===Reactor Support Office of Nuclear Reactor Regulation===
onsite power sources during outages as well as during operation.
Technical


contacts: R. Schin, RII (404) 331-5561 P. Fillion, RII (404) 331-7288 P. Holmes-Ray, RII (904) 795-7677 P. Kang, NRR (301) 504-2779 R. Prevatte, RII (919) 457-9531 Attachment:
This information notice requires no specific action or written response. If
List of Recently Issued NRC Information


Notices*SEE PREVIOUS CONCURRENCE
you have any questions about the information in this notice, please contact


OFFICE *RII *TECH ED *EELB *C:EELB:NRR
one of the technical contacts listed below or the appropriate Office of


===NAME RSchin JBeeson PKang CBerlinger===
Nuclear Regulation (NRR) project manager.
DATE _07/13/93
08/09/93 11/03/93 /03/93 I_ 77 1 10 nlnr*OGCB!DORS


*C:OGCB:DORS
Brian K. Grimes, Director


JTWiggins
Division of Operating Reactor Support


NECampbell
Office of Nuclear Reactor Regulation


GHMarcus / /IIIl 11/04/93 11/18/93 1 1/23/93 12/1'5/93 1L OUMtNi NAIt: Ns-V*.zN
Technical contacts:     R. Schin, RII                  P. Fillion, R11
                        (404) 331-5561                (404) 331-7288 P. Holmes-Ray, RII            P. Kang, NRR


IN 93-XX December xx, 1993 shorter period of time. Consequently, the insulators
(904) 795-7677                (301) 504-2779 R. Prevatte, RII


at Pilgrim were cleaned and coated with protective
(919) 457-9531 Attachment:
List of Recently Issued NRC Information Notices


RTV coating again during the spring 1993 refueling outage. As an alternate
*SEE PREVIOUS CONCURRENCE


long term option, the licensee is considering
OFFICE      *RII              *TECH ED            *EELB            *C:EELB:NRR


a replacement
NAME        RSchin            JBeeson            PKang            CBerlinger


of the existing 345 kV switchyard
DATE        07/13/93        -08/09/93            ,11/03/93          11/03/93 D: DE          I *OGCB:DORS          *C:OGCB:DORS    D: DORS


with a modern compactly
JTWiggins        NECampbell        l GHMarcus        BKGrimes        l


designed switchyard
11/04/93          11/18/93            11/23/93        112/  /93
                                                                            -J


which would be more resistant
r


to the coastal environment.
UCLUMNI  NAMt: bWIl1H1N.NMC                                            /Wr PD


These events illustrate
IN 93-XX


the significance
November xx, 1993 NRC review of these events concluded that the safety-related equipment at the


of maintaining
affected units performed as designed and there were no increased risks to the


reliable offsite and onsite power sources during outages as well as during operation.
public.


This information
This information notice requires no specific action or written response. If


notice requires no specific action or written response.
you have any questions about the information in this notice, please contact


If you have any questions
one of the technical contacts listed below or the appropriate Office of


about the information
Nuclear Regulation (NRR) project manager.


in this notice, please contact one of the technical
Brian K. Grimes, Director


contacts listed below or the appropriate
Division of Operating Reactor Support


Office of Nuclear Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Office of Nuclear Reactor Regulation


===Reactor Support Office of Nuclear Reactor Regulation===
Technical contacts:        R. Schin, RII            P. Fillion, RII
Technical


contacts: R. Schin, RII (404) 331-5561 P. Fillion, R11 (404) 331-7288 P. Holmes-Ray, (904) 795-7677 RII P. Kang, NRR (301) 504-2779 R. Prevatte, RII (919) 457-9531 Attachment:
(404) 331-5561           (404) 331-7288 P. Holmes-Ray, RII       P. Kang, NRR
List of Recently Issued NRC Information


Notices*SEE PREVIOUS CONCURRENCE
(904) 795-7677          (301) 504-2779 R. Prevatte, R11
                            (919) 457-9531 Attachment:


OFFICE *RII *TECH ED *EELB *C:EELB:NRR
===List of Recently Issued NRC Information Notices===
*SEE PREVIOUS CONCURRENCE


===NAME RSchin JBeeson PKang CBerlinger===
OFFICE          *RII              *TECH ED        *EELB          *C:EELB:NRR
DATE 07/13/93 -08/09/93
,11/03/93
11/03/93 D: DE I *OGCB:DORS


*C:OGCB:DORS
NAME            RSchin            JBeeson          PKang          CBerlinger


D: DORS JTWiggins
DATE          J07/13/93 o08/09/93 i11/03/930,                                    11/03/93
                                                                    1I


NECampbell
~1*
  D: DE                *OGCB:DORS        C:OGCB:DORS    D: DORS


l GHMarcus BKGrimes l 11/04/93 11/18/93 11/23/93 112/ /93-J r UCLUMNI NAMt: bWIl1H1N.NMC
JTWiggins            NECampbell        GHMarcus         BKGrimes L


/Wr PD
11/04/93          111/18/93          11/Z/93          11/ /93
  -    - -- -- - -    - -- - -
DOCUMENT NAME: SWITCHIN.NEC


IN 93-XX November xx, 1993 NRC review of these events concluded
IN 93-XX


that the safety-related
November xx, 1993 NRC review of these events concluded that the safety-related equipment at the


equipment
affected units performed as designed and there were no increased risks to the


at the affected units performed
public.


as designed and there were no increased
This information notice requires no specific action or written response. If


risks to the public.This information
you have any questions about the information in this notice, please contact


notice requires no specific action or written response.
one of the technical contacts listed below or the appropriate Office of


If you have any questions
Nuclear Regulation (NRR) project manager.


about the information
Brian K. Grimes, Director


in this notice, please contact one of the technical
Division of Operating Reactor Support


contacts listed below or the appropriate
Office of Nuclear Reactor Regulation


Office of Nuclear Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Technical contacts:            R. Schin, RII              P. Fillion, RII            P. Kang, NRR


===Reactor Support Office of Nuclear Reactor Regulation===
(404) 331-5561              (404) 331-7288              (301) 504-2779 P. Holmes-Ray, SRI, Crystal River
Technical


contacts: R. Schin, RII (404) 331-5561 P. Fillion, RII (404) 331-7288 P. Holmes-Ray, RII (904) 795-7677 P. Kang, NRR (301) 504-2779 R. Prevatte, R11 (919) 457-9531 Attachment:
(904) 795-7677 R. Prevatte, SRI, Brunswick
List of Recently Issued NRC Information


Notices*SEE PREVIOUS CONCURRENCE
(919) 457-9531 Attachment:
  List of Recently Issued NRC Information Notices


OFFICE *RII *TECH ED *EELB *C:EELB:NRR
-
  *SEE PREVIOUS CANCUIRRFNCr


===NAME RSchin JBeeson PKang CBerlinger===
OFFICE            *RII              *TECH ED                *EELB                *C:EELB:NRR
DATE J07/13/93 o08/09/93 i11/03/930, 11/03/93 1I~1*D: DE*OGCB:DORS


C:OGCB:DORS
NAME              RSchin            JBeeson                PKang                  CBerlinger


D: DORS JTWiggins
DATE              07/13/93          08/09/93                11/03/93              11/03/93 D: DE                  OGCB:DORS         c:OGCB:RSfl            n-nnl* z


NECampbell
JTWiggins              NECampbell         GHMacus                BKGrimes


GHMarcus BKGrimes L 11/04/93 111/18/93  
11/04/93               11/1!/93     'f I II/       /93         II/     /93 n 1flPkrilIT  ,k*IAr-   tLI      .-
11/Z/93 11/ /93-------------DOCUMENT NAME: SWITCHIN.NEC
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IN 93-XX November xx, 1993 NRC review of these events concluded
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that the safety-related
no,&  AAW&WetfA.                              7


equipment
IN 93-XX


at the affected units performed
November xx, 1993 This information notice requires no specific action or written response. If


as designed and there were no increased
you have any questions about the information in this notice, please contact


risks to the public.This information
one of the technical contacts listed below or the appropriate Office of


notice requires no specific action or written response.
Nuclear Regulation (NRR) project manager.


If you have any questions
Brian K. Grimes, Director


about the information
Division of Operating Reactor Support


in this notice, please contact one of the technical
Office of Nuclear Reactor Regulation


contacts listed below or the appropriate
Technical contacts:    R. Schin, RII            P. Fillion, RII


Office of Nuclear Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
(404) 331-5561          (404) 331-7288 P. Holmes-Ray, SRI, Crystal River


===Reactor Support Office of Nuclear Reactor Regulation===
(904) 795-7677 R. Prevatte, SRI, Brunswick
Technical


contacts: R. Schin, RII (404) 331-5561 P. Fillion, RII (404) 331-7288 P. Kang, NRR (301) 504-2779 P. Holmes-Ray, SRI, Crystal River (904) 795-7677 R. Prevatte, SRI, Brunswick (919) 457-9531 Attachment:
(919) 457-9531 Attachment:
List of Recently Issued NRC Information


Notices*SEE PREVIOUS CANCUIRRFNCr
===List of Recently Issued NRC Information Notices===
*SEE PREVIOUS CONCURRENCE


-OFFICE *RII *TECH ED *EELB *C:EELB:NRR
OFFICE     *RII             *TECH ED             *EELB         *C:EELB:NRR


===NAME RSchin JBeeson PKang CBerlinger===
NAME       RSchin           JBeeson             PKang         CBerlinger
DATE 07/13/93 08/09/93 11/03/93 11/03/93 D: DE OGCB:DORS c:OGCB:RSfl


n-nnl* z JTWiggins
DATE      1 07/13/93        - 08/09/93            11/03/93        ,11/03/93 D:DE              OGCB:DORS            C:OGCB:DORS      D:DORS


N ECampbell
JTWiggins      l NECampbell          GHMarcus        BKGrimes


GHMacus BKGrimes 11/04/93 11/1!/93 'f I II/ /93 II/ /93 1flPkrilIT ,k*IAr- tLI .-n UUvUtICNI
A /f/9/                 /93       -9I/     /93         U/   /93 DOCUME    3E: SWITCHIN.NEC


MIAMEi: 3Wl1tlnrN.NLLv
IN 93-XX


7Vt C , I,/-? d2., Pe ~z no,& AAW&WetfA.
August xx, 1993 This information notice requires no specific action or written response. If


7 IN 93-XX November xx, 1993 This information
you have any questions about the information in this notice, please contact


notice requires no specific action or written response.
one of the technical contacts listed below or the appropriate Office of


If you have any questions
Nuclear Regulation (NRR) project manager.


about the information
Brian K. Grimes, Director


in this notice, please contact one of the technical
Division of Operating Reactor Support


contacts listed below or the appropriate
Office of Nuclear Reactor Regulation


Office of Nuclear Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Technical contacts:        R. Schin, RII


===Reactor Support Office of Nuclear Reactor Regulation===
(404) 331-5561 P. Fillion, RII
Technical


contacts: R. Schin, RII (404) 331-5561 P. Fillion, RII (404) 331-7288 P. Holmes-Ray, SRI, Crystal River (904) 795-7677 R. Prevatte, SRI, Brunswick (919) 457-9531 Attachment:
(404) 331-7288                                     di
List of Recently Issued NRC Information


Notices*SEE PREVIOUS CONCURRENCE
P. Holmes-Ray, SRI, Crystal River


OFFICE *RII *TECH ED *EELB *C:EELB:NRR
(904) 795-7677
                                                                                                  6 4'
                          R. Prevatte, SRI, Brunswick


===NAME RSchin JBeeson PKang CBerlinger===
(919) 457-9531 Attachment:
DATE 1 07/13/93 -08/09/93 11/03/93 ,11/03/93 D:DE OGCB:DORS C:OGCB:DORS
List of Recently Issued NRC Information Notices


D:DORS JTWiggins
*SFF PREVIOUS CONCURRENCE


l NECampbell
---
  OFFICE


GHMarcus BKGrimes A / f/9/ /93 -9I/ /93 U/ /93 DOCUME 3E: SWITCHIN.NEC
- I____
                *RII


IN 93-XX August xx, 1993 This information
I-
                                    W'
                                      IttLLx


notice requires no specific action or written response.
I


If you have any questions
__          I_ .,-n


about the information
LLL;V,
                                                                  e


in this notice, please contact one of the technical
"Ir


contacts listed below or the appropriate
I o..erg BUD.


Office of Nuclear Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
II


===Reactor Support Office of Nuclear Reactor Regulation===
NAME        RSchin              JBeeson              VS/ PKang                CBerlinger
Technical


contacts: R. Schin, RII (404) 331-5561 P. Fillion, RII (404) 331-7288 P. Holmes-Ray, SRI, Crystal River (904) 795-7677 R. Prevatte, SRI, Brunswick (919) 457-9531 di 6 4'I o. .erg BUD. II Attachment:
DATE        07/13/ 93            093                          ________      __#
List of Recently Issued NRC*SFF PREVIOUS CONCURRENCE
                                                                                  __93  _ _/93
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Information
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                                                                      __ ._
  JTWiggins          NECampbell          GHMarcus                BKGrimes


Notices--- -I____ I- __ I_ ., -n e OFFICE *RII W' I ttLLx LLL; "Ir I V, NAME RSchin JBeeson VS/ PKang CBerlinger
08/    /93        08/  /93          08/    /93              08/      /93 DOCUMENT NAML: SMILHIN.iLL


DATE 07/13/ 93 093 ________ __93 __# _ _/93--39 nffF I Onrr FtlORS C !OGCR :DORS D: DORS vI o .-.__ ____ ._ _JTWiggins
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NECampbell
-  IN 93-XX


GHMarcus BKGrimes 08/ /93 08/ /93 08/ /93 08/ /93 DOCUMENT NAML: SMILHIN.iLL
August xx, 1993 This information notice requires no specific action or written response. If


* w-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.
one of the technical contacts listed below or the appropriate Office of


If you have any questions
Nuclear Regulation (NRR) project manager.


about the information
Brian K. Grimes, Director


in this notice, please contact one of the technical
Division of Operating Reactor Support


contacts listed below or the appropriate
Office of Nuclear Reactor Regulation


Office of Nuclear Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Technical contacts:    R. Schin, RII            P. Fillion, RII


===Reactor Support Office of Nuclear Reactor Regulation===
(404) 331-5561            (404) 331-7288 P. Holmes-Ray, SRI, Crystal River
Technical


contacts: R. Schin, RII (404) 331-5561 P. Fillion, RII (404) 331-7288 P. Holmes-Ray, SRI, Crystal River (904) 795-7677 R. Prevatte, SRI, Brunswick (919) 457-9531 Attachment:
(904) 795-7677 R. Prevatte, SRI, Brunswick
List of Recently Issued NRC Information


Notices*SFF PREVIOUS CONCURRENCE
(919) 457-9531 Attachment:
    List of Recently Issued NRC Information Notices


OFFICE RII *TECH ED EELB C:EELB:NRR
*SFF PREVIOUS CONCURRENCE


NAME .RSchin JBeeson SSaba (I .¢ CBerlinger
OFFICE      RII              *TECH ED              EELB              C:EELB:NRR


DATE ______08/7
NAME      . RSchin          JBeeson                SSaba    (I. ¢  CBerlinger
/93 08/ /93 08/ /93-~.1 D: DE OGCB:DORS C:OGCB:DORS


D: DORS JTWiggins
DATE                                /93
                                      ______08/7        08/  /93        08/  /93
                                                                  -~.1 D: DE            OGCB:DORS        C:OGCB:DORS            D: DORS


NECampbell
JTWiggins        NECampbell       GHMarcus              BKGrimes


GHMarcus BKGrimes 08/ /93 08/ /93 08/ /93 1 08/ /93 DOCUMENT NAME: SWITCHIN.NEC}}
08/ /93         08/ /93           08/       /93       1 08/     /93 DOCUMENT NAME: SWITCHIN.NEC}}


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

Revision as of 03:23, 24 November 2019

Storm-Related Loss of Offsite Power Events Due to Salt Buildup on Switchyard Insulators
ML031070158
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, 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, Crane  
Issue date: 12/13/1993
From: Grimes B
Office of Nuclear Reactor Regulation
To:
References
IN-93-095, NUDOCS 9312070298
Download: ML031070158 (11)
v • d • e


UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 December 13, 1993 NRC INFORMATION NOTICE 93-95: STORM-RELATED LOSS OF OFFSITE POWER EVENTS

DUE TO SALT BUILDUP ON SWITCHYARD INSULATORS

Addressees

All holders of operating licensees or construction permits for nuclear power

reactors located close to a large body of salt water.

PurDose

The U.S. Nuclear Regulatory Commission (NRC) is issuing this information

notice to alert addressees to the potential for loss of offsite power due to

salt contamination of switchyard insulators. It is expected that recipients

will review the information for applicability to their facilities and consider

actions, as appropriate, to avoid similar problems. However, no specific

action or written response is required.

Description of Circumstances

On March 17, 1993, the Florida Power Corporation Crystal River Unit 3 experienced a loss of the 230 kV switchyard (normal offsite power to safety- related busses) when a light rain caused arcing across salt-laden 230 kV

insulators and opened breakers in the switchyard. At the time, the unit was

in cold shutdown during a maintenance outage. The 'Al emergency diesel

generator was used to power safety-related loads including shutdown cooling

until the 230 kV switchyard was restored. The ABE emergency diesel generator

was unavailable due to maintenance. The 500 kV switchyard supplied nonvital

loads throughout the event.

On March 16 through 18, 1993, Carolina Power and Light Company's Brunswick

Units 1 and 2 experienced a loss of the 230 kV switchyards (all offsite power)

when light rain caused arcing across salt-laden insulators and opened breakers

in the switchyard. At the time, both units were in cold shutdown during an

extended outage. Emergency diesel generators were used to power safety- related loads including shutdown cooling until the offsite power was restored.

Since 1982, the Boston Edison Company Pilgrim station has also experienced

several loss of offsite power events when heavy ocean storms deposited salt on

the 345 kV switchyard causing the insulators to arc to ground.

9312070298 LAe~ffL.A~1241{3/f3P

tE

X1P4 N4 e, 93-95* 777

k IN 93-95 K>

December 13, 1993 Discussion

Intense and unusual storms on March 13 and 14, 1993, produced high tides and

high winds (average of 80 to 97 kilometers/hour high winds (50 to 60

miles/hour], with gusts up to 160 kilometers/hour [100 miles/hour] blowing

ashore from the ocean i.e., Gulf of Mexico and Atlantic Ocean. These storms

caused an unusual buildup of salt on the switchyard insulators at

Crystal River Unit 3 and Brunswick Units 1 and 2. The storms were unusual in

that they included high winds but little or no precipitation. As a result, salt from ocean spray built up on the switchyard insulators and was not washed

away by rain.

Days later, light rain increased the electrical conductivity of the salt, resulting in arcing across the insulators at both sites. To remove the salt

from the insulators, Florida Power Corporation and Carolina Power and Light

Company deenergized the affected switchyards, washed the insulators with high

pressure demineralized water, then returned the switchyards to service. The

washing stopped the electrical arcing across the insulators.

The 500 kV switchyard for Crystal River Unit 3 is located adjacent to the

230 kV switchyard. It was relatively unaffected. The 500 kV switchyard is

used for main generator output when Unit 3 is operating and is used for an

alternate source of offsite power (i.e., backfeeding of nonvital loads) during

Unit 3 outages. The 500 kV switchyard experienced less arcing across the

insulators than the 230 kV switchyard and no tripped breakers. As a

precautionary measure, the licensee also deenergized and washed the 500 kV

switchyard insulators. Factors that may have reduced the storm inpact on the

500 kV switchyard included location (farther away from the shore) and higher

insulation level (the 500 kV insulators were designed for up to 700 kV

operation while the 230 kV insulators were designed for up to 242 kV

operation). In addition, the licensee observed that, of the two types of

230 kV insulators installed, the newer post type had less arcing than the

older cap and pin type.

Licensee followup action in response to these events, to improve the future

performance of non-safety switchyard equipment, included: investigating

available salt buildup monitoring systems, evaluating insulator washing

methods/capabilities, considering the use of room temperature vulcanized (RTV)

silicon rubber coatings, installing newer metal oxide gapless surge arrestors

to replace older silicon carbide gap type surge arrestors, and replacing

cellon-treated wood transmission towers.

The 345 kV switchyard insulators at Pilgrim were coated with RTV silicon

rubber (Sylgard) in 1987. It was expected that the RTV coating, when applied

in 1987, would be effective for a period of 15 years. However, actual

experience at Pilgrim indicates that the coating is effective for a much

`- IN 93-95 December 13, 1993 shorter period of time. Consequently, the Insulators at Pilgrim were cleaned

and coated with RTV again during the spring 1993 refueling outage. As a long- term option, the licensee is considering a replacement of the existing 345 kV

switchyard with a modern compactly designed switchyard which would be more

resistant to the coastal environment.

These events illustrate the significance of maintaining reliable offsite and

onsite power sources during outages as well as during operation.

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 Regulation (NRR) project manager.

Bran . Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: R. Schin, RII P. Fillion, RII

(404) 331-5561 (404) 331-7288 P. Holmes-Ray, RII P. Kang, NRR

(904) 795-7677 (301) 504-2779 R. Prevatte, RII

(919) 457-9531 Attachment:

List of Recently Issued NRC Information Notices

Attachment

IN 93-95 December 13, 1993 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Informati on Date of

Notice No. Subject Issuance Issued to

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 Report" (White

Book).

89-77, Debris in Containment 12/03/93 All holders of OLs or CPs

Supp. 1 Emergency Sumps and for nuclear power reactors.

Incorrect Screen

Configurations

93-91 Misadjustment Between 12/03/93 All holders of OLs or CPs

General Electric 4.16-KV for nuclear power reactors.

Circuit Breakers and Their

Associated Cubicles

93-90 Unisolatable Reactor 12/01/93 All holders of OLs or CPs

Coolant System Leak for nuclear power reactors.

Following Repeated

Applications of Leak

Sealant

OL - Operating License

CP - Construction Permit

IN 93-95 December 13, 1993 shorter period of time. Consequently, the Insulators at Pilgrim were cleaned

and coated with RTV again during the spring 1993 refueling outage. As a long- term option, the licensee is considering a replacement of the existing 345 kV

switchyard with a modern compactly designed switchyard which would be more

resistant to the coastal environment.

These events Illustrate the significance of maintaining reliable offsite and

onsite power sources during outages as well as during operation.

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 Regulation (NRR) project manager.

OgItf Ognefw 5 Brian K. Grimeg

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: R. Schin, RII P. Fillion, RII

(404) 331-5561 (404) 331-7288 P. Holmes-Ray, RII P. Kang, NRR

(904) 795-7677 (301) 504-2779 R. Prevatte, RII

(919) 457-9531 Attachment:

List of Recently Issued NRC Information Notices

  • SEE PREVIOUS CONCURRENCE

OFFICE *RII *TECH ED *EELB *C:EELB:NRR

NAME RSchin JBeeson PKang CBerlinger

DATE _07/13/93 08/09/93 11/03/93 /03/93 I_ 1077 1 nlnr *OGCB!DORS *C:OGCB:DORS

JTWiggins NECampbell GHMarcus / /IIIl

11/04/93 11/18/93 11/23/93 12/1'5/93

1LOUMtNi NAIt: Ns-V*.zN

IN 93-XX

December xx, 1993 shorter period of time. Consequently, the insulators at Pilgrim were cleaned

and coated with protective RTV coating again during the spring 1993 refueling

outage. As an alternate long term option, the licensee is considering a

replacement of the existing 345 kV switchyard with a modern compactly designed

switchyard which would be more resistant to the coastal environment.

These events illustrate the significance of maintaining reliable offsite and

onsite power sources during outages as well as during operation.

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 Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: R. Schin, RII P. Fillion, R11

(404) 331-5561 (404) 331-7288 P. Holmes-Ray, RII P. Kang, NRR

(904) 795-7677 (301) 504-2779 R. Prevatte, RII

(919) 457-9531 Attachment:

List of Recently Issued NRC Information Notices

  • SEE PREVIOUS CONCURRENCE

OFFICE *RII *TECH ED *EELB *C:EELB:NRR

NAME RSchin JBeeson PKang CBerlinger

DATE 07/13/93 -08/09/93 ,11/03/93 11/03/93 D: DE I *OGCB:DORS *C:OGCB:DORS D: DORS

JTWiggins NECampbell l GHMarcus BKGrimes l

11/04/93 11/18/93 11/23/93 112/ /93

-J

r

UCLUMNI NAMt: bWIl1H1N.NMC /Wr PD

IN 93-XX

November xx, 1993 NRC review of these events concluded that the safety-related equipment at the

affected units performed as designed and there were no increased risks to the

public.

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 Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: R. Schin, RII P. Fillion, RII

(404) 331-5561 (404) 331-7288 P. Holmes-Ray, RII P. Kang, NRR

(904) 795-7677 (301) 504-2779 R. Prevatte, R11

(919) 457-9531 Attachment:

List of Recently Issued NRC Information Notices

  • SEE PREVIOUS CONCURRENCE

OFFICE *RII *TECH ED *EELB *C:EELB:NRR

NAME RSchin JBeeson PKang CBerlinger

DATE J07/13/93 o08/09/93 i11/03/930, 11/03/93

1I

~1*

D: DE *OGCB:DORS C:OGCB:DORS D: DORS

JTWiggins NECampbell GHMarcus BKGrimes L

11/04/93 111/18/93 11/Z/93 11/ /93

- - -- -- - - - -- - -

DOCUMENT NAME: SWITCHIN.NEC

IN 93-XX

November xx, 1993 NRC review of these events concluded that the safety-related equipment at the

affected units performed as designed and there were no increased risks to the

public.

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 Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: R. Schin, RII P. Fillion, RII P. Kang, NRR

(404) 331-5561 (404) 331-7288 (301) 504-2779 P. Holmes-Ray, SRI, Crystal River

(904) 795-7677 R. Prevatte, SRI, Brunswick

(919) 457-9531 Attachment:

List of Recently Issued NRC Information Notices

-

  • SEE PREVIOUS CANCUIRRFNCr

OFFICE *RII *TECH ED *EELB *C:EELB:NRR

NAME RSchin JBeeson PKang CBerlinger

DATE 07/13/93 08/09/93 11/03/93 11/03/93 D: DE OGCB:DORS c:OGCB:RSfl n-nnl* z

JTWiggins NECampbell GHMacus BKGrimes

11/04/93 11/1!/93 'f I II/ /93 II/ /93 n 1flPkrilIT ,k*IAr- tLI .-

UUvUtICNI MIAMEi: 3Wl1tlnrN.NLLv

7Vt C , I,/-? d2., ~z Pe

no,& AAW&WetfA. 7

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

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

Nuclear Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: R. Schin, RII P. Fillion, RII

(404) 331-5561 (404) 331-7288 P. Holmes-Ray, SRI, Crystal River

(904) 795-7677 R. Prevatte, SRI, Brunswick

(919) 457-9531 Attachment:

List of Recently Issued NRC Information Notices

  • SEE PREVIOUS CONCURRENCE

OFFICE *RII *TECH ED *EELB *C:EELB:NRR

NAME RSchin JBeeson PKang CBerlinger

DATE 1 07/13/93 - 08/09/93 11/03/93 ,11/03/93 D:DE OGCB:DORS C:OGCB:DORS D:DORS

JTWiggins l NECampbell GHMarcus BKGrimes

A /f/9/ /93 -9I/ /93 U/ /93 DOCUME 3E: SWITCHIN.NEC

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

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

Nuclear Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: R. Schin, RII

(404) 331-5561 P. Fillion, RII

(404) 331-7288 di

P. Holmes-Ray, SRI, Crystal River

(904) 795-7677

6 4'

R. Prevatte, SRI, Brunswick

(919) 457-9531 Attachment:

List of Recently Issued NRC Information Notices

  • SFF PREVIOUS CONCURRENCE

---

OFFICE

- I____

  • RII

I-

W'

IttLLx

I

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II

NAME RSchin JBeeson VS/ PKang CBerlinger

DATE 07/13/ 93 093 ________ __#

__93 _ _/93

-- 39 nffF Io Onrr FtlORS C!OGCR :DORS D: DORS

vI . -. ____

__ ._

JTWiggins NECampbell GHMarcus BKGrimes

08/ /93 08/ /93 08/ /93 08/ /93 DOCUMENT NAML: SMILHIN.iLL

  • w

- 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

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

Nuclear Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: R. Schin, RII P. Fillion, RII

(404) 331-5561 (404) 331-7288 P. Holmes-Ray, SRI, Crystal River

(904) 795-7677 R. Prevatte, SRI, Brunswick

(919) 457-9531 Attachment:

List of Recently Issued NRC Information Notices

  • SFF PREVIOUS CONCURRENCE

OFFICE RII *TECH ED EELB C:EELB:NRR

NAME . RSchin JBeeson SSaba (I. ¢ CBerlinger

DATE /93

______08/7 08/ /93 08/ /93

-~.1 D: DE OGCB:DORS C:OGCB:DORS D: DORS

JTWiggins NECampbell GHMarcus BKGrimes

08/ /93 08/ /93 08/ /93 1 08/ /93 DOCUMENT NAME: SWITCHIN.NEC


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