Information Notice 1993-25, Electrical Penetration Assembly Degradation: Difference between revisions

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{{#Wiki_filter:I'- 'UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF NUCLEAR REACTOR REGULATIONWASHINGTON, D.C. 20555April 1, 1993NRC INFORMATION NOTICE 93-25: ELECTRICAL PENETRATION ASSEMBLY DEGRADATION
{{#Wiki_filter:I'- 'UNITED STATES NUCLEAR REGULATORY
 
COMMISSION
 
===OFFICE OF NUCLEAR REACTOR REGULATION===
WASHINGTON, D.C. 20555 April 1, 1993 NRC INFORMATION
 
NOTICE 93-25: ELECTRICAL
 
PENETRATION
 
===ASSEMBLY DEGRADATION===


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


==Purpose==
==Purpose==
The U.S. Nuclear Regulatory Commission (NRC) is issuing this informationnotice to alert addressees to problems that could result in degradation ofelectrical penetration assembly seals. This information notice focuses on thecontainment integrity function of these seals. It is expected that recipientswill review the information for applicability to their facilities and consideractions, as appropriate, to avoid similar problems. However, suggestionscontained in this information notice are not NRC requirements; therefore, nospecific action or written response is required.
The U.S. Nuclear Regulatory
 
Commission (NRC) is issuing this information
 
notice to alert addressees
 
to problems that could result in degradation
 
of electrical
 
penetration
 
assembly seals. This information
 
notice focuses on the containment
 
integrity
 
function of these seals. It is expected that recipients
 
will review the information
 
for applicability
 
to their facilities
 
and consider actions, as appropriate, to avoid similar problems.
 
===However, suggestions===
contained
 
in this information
 
notice are not NRC requirements;  
therefore, no specific action or written response is required.Description
 
of Circumstances
 
In July 1987 and in October 1989, the licensee for the Trojan Nuclear Plant, the Portland General Electric Company, reported problems with containment
 
air leakage through its Bunker-Ramo
 
electrical
 
penetration
 
assembly seals[licensee
 
event reports (LERs) 50-344/87-11 and 50-344/89-23].
 
In July and August 1991, the NRC inspected
 
the use of containment
 
electrical
 
penetration
 
assembly seals at Trojan and concluded
 
that the licensee had not established
 
an effective
 
program for trending and evaluating
 
electrical
 
penetration
 
assembly seal leakage (Inspection
 
Report 50-344/91-27).
 
On October 28, 1991, while the plant was in a refueling
 
outage, the licensee reported to the NRC that in the originally
 
installed
 
electrical
 
penetration
 
assemblies, the seal (polyurethane)
and lubricant (Celvacene
 
or Glycerin)
materials
 
were inappropriate
 
for the application (LER 50-344/91-11-01).
 
The licensee concluded
 
that these materials
 
may cause seal degradation
 
and that the seals may become degraded if subjected
 
to design basis accident conditions
 
for moisture or temperature.
 
The licensee replaced the electrical
 
penetration
 
assembly seal with an environmentally
 
qualified
 
ethylene propylene
 
rubber seal and added a silicone rubber backup O-ring to the outer face of each electrical
 
penetration
 
assembly module. The licensee subsequently
 
replaced all the Bunker-Ramo
 
electrical
 
penetration
 
assemblies
 
with Conax assemblies.
 
Discussion
 
Electrical
 
penetration
 
assemblies
 
provide electrical
 
continuity
 
for field cables penetrating
 
the containment
 
and maintain containment
 
integrity.
 
9303250146
-PW a: f1) t arC;02S ISoC'aoI I \l
 
.a IN 93-25 April 1, 1993 Degraded electrical
 
penetration
 
assemblies
 
can adversely
 
affect containment
 
integrity
 
by allowing excessive
 
leakage from the containment
 
under accident conditions.
 
The Bunker-Ramo
 
electrical
 
penetration
 
assembly consists of a cylindrical
 
structure
 
with circular header plates at each end. One header plate is designed to be bolted to a flange on the containment
 
liner plate penetration
 
nozzle. Containment
 
integrity
 
is achieved by two C-cup seals between the flanges. In the Bunker-Ramo
 
design, a helical spring-loaded
 
polyurethane
 
seal is mounted at each end of the-electrical
 
penetration
 
assembly.
 
Each electrical
 
penetration
 
assembly has two seals, an outer one, nominally
 
of 8.9 cm [3.5 inch] diameter, and an inner one, of nominally
 
6.4 cm [2.5 inch]diameter.
 
The outer seal functions
 
as part of the containment
 
boundary while the inner seal functions
 
as an outer seal test pressure boundary.
 
The electrical
 
penetration
 
assembly header plate is equipped with a connection
 
to which a pressure indicating
 
gauge can be attached to monitor seal leakage.At the Trojan plant, the qualified
 
life of the seal had not been accurately
 
established.
 
The simultaneous
 
effects of corrosion
 
and moisture at normal temperature
 
had not been taken into account. The established
 
longevity
 
was not corrected
 
after factoring
 
in the actual degradation
 
observed during periodic surveillance
 
of the individual
 
seals.' Also, an administrative
 
mechanism
 
was not in place to replace the seals before their estimated qualified
 
life expired. The original seal material in the Bunker-Ramo
 
electrical
 
penetration
 
assembly has polyester''urethane
 
manufactured
 
by Parker Packing Company (Parker) under the trade name of Parkerthane (Parker Compound No. P4611). Parker, which manufactures
 
both polyester
 
urethane and polyether urethane seals, indicated
 
in its catalog that polyester
 
urethane maintains critical characteristics
 
up to 6 years while polyether
 
urethane maintains critical characteristics
 
up to 10 years.The polyester
 
urethane (the originally
 
installed
 
seal material)
was determined
 
inadequate
 
for several reasons: Short expected life (independently
 
estimated
 
at 2-5 years under some conditions)
Incompatibility
 
with water (hydrolysis
 
shortens life)Incompatibility
 
with high temperature (acceleration
 
of hydrolysis)
Susceptibility
 
to compression-set (a slowly acquired permanent deformation)
The licensee used different
 
lubricants
 
over the years. In 1987, the licensee determined
 
that three seals had failed because they were erroneously
 
lubricated
 
with an incompatible (silicone)
grease. After examination
 
of seal failures that occurred in 1991, Parker determined
 
that the failed seals had castor oil residue on the exterior, indicative
 
of the use of Celvacene lubricant', which'includes
 
castor oil and cellulose
 
acetate butyrate.Celvacene, specified
 
for use by the original penetration
 
supplier, can cause
 
IN 93-25 April 1, 1993 degradation
 
of polyurethane
 
as follows. The cellulose
 
acetate butyrate component
 
breaks down in the presence of moisture, producing
 
butyric acid, which in turn catalyses
 
hydrolysis
 
of the seal polymer. The hydrolysis
 
slowly degrades the polyurethane
 
material.
 
Under accident conditions, the seal degradation
 
may be accelerated.
 
The original penetration
 
supplier, Bunker-Ramo, no longer supplies such assemblies.
 
Similar electrical
 
penetration
 
assemblies
 
have been supplied by Amphenol, but this company also no longer supplies such assemblies.
 
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, Director Division of Operating
 
===Reactor Support Office of Nuclear Reactor Regulation===
Technical
 
contacts:
C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachment:
List of Receitly Issued NRC Information
 
Notices
 
14 Attachment
 
IN 93-25 April 1, 1993 Page I of I LIST OF RECENTLY ISSUED KRC INFORMlATION
 
NOTICES a 4c 40L '0 I UJ :3 0 A.UflU Inrormation
 
Notice No.93-24 93-23 93-22 93-21 93-20 93-19 93-18)93-17 93-16 Subject Distribution
 
of Revision 7 of PURE6-1021.
 
0Operator
 
Licensing Examiner Standards" Weschler Instruments
 
===Nodel 252 Switchboard===
Peters Triping of Klockner-Nfoeller Molded-Case
 
Circuit Breakers due to Support Level Failure Summary of NRC Staff Observations
 
Compiled during Engineering
 
Audits or Inspections
 
of Licen-see Erosion/Corrosion
 
Programs Thermal Fatigue Cracking of Feedwater
 
Piping to*Steam Generators
 
Slab Hopper Bulging Portable Moisture-Density
 
===Gauge User Responsibilities===
during Field Operations
 
Safety Systems Response to Loss of Coolant and Loss of Offs1te Power Failures of Nut-Locking
 
Devices in Check Valves Issuane Issued to 03/31/93 All holders of orater and senior operator eienses at nuclear power reactors.03/31/93 All holders of OLs or CPs for nuclear power reactors.03/26/93 All holders of OLs or CPs for nuclear power reactors.03/25/93 All holders of OLs or CPs for light water nuclear power reactors.I i 03/24/93 All holders of OLs or CPs for PWRs supplied by Westinghouse
 
or Combustion
 
Engineering.
 
03/17/92 All nuclear fuel cycle licensees.
 
03/10/93 All U.S. Nuclear Regulatory
 
Commission
 
licensees
 
that possess moisture-density
 
gauges.03/08/93 All holders of OLs or CPs for nuclear power reactors.02/19/93 All holders of OLs or CPs for nuclear power reactors.2 I(00 00 W O 1 c1 n 2 IL I-I U 4): zU Z a FA.~OL -Operating
 
License CP -Construction
 
Permit
 
IN 93-25 April 1, 1993 degradation
 
of polyurethane
 
as follows. The cellulose
 
acetate butyrate component
 
breaks down in the presence of moisture, producing
 
butyric acid, which in turn catalyses
 
hydrolysis
 
of the seal polymer. The hydrolysis
 
slowly degrades the polyurethane
 
material.
 
Under accident conditions, the seal degradation
 
may be accelerated.
 
The original penetration
 
supplier, Bunker-Ramo, no longer supplies such assemblies.
 
Similar electrical
 
penetration
 
assemblies
 
have been supplied by Amphenol, but this company also no longer supplies such assemblies.
 
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.orig /s/'d by BKGrimes Brian K. Grimes, Director Division of Operating
 
===Reactor Support Office of Nuclear Reactor Regulation===
Technical
 
contacts: C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachment:
List of Recently Issued NRC Information
 
Notices*SEE PRMV a CONCURRENCES
 
*C/OGCB:DORS:NRR*RPB:ADM
 
GHMarcus TechEd 03/05/93 04/13/92*D/DRIL:NRR
 
CERossi 03/03/93*C/RVIB:DRIL:NRR
 
LJNorrholm
 
02/27/93*OGCB: DORS:NRR CVHodge 06/03/92*RESINSP/RV
 
RBarr 06/03/92*RVIB:DRIL:NRR
 
KNaidu 01/11/93*SC/RVIB:DRIL:NRR
 
GCwallna 02/27/93 DOCUMENT NAME: 93-25.IN
 
IN 93-XX March xx, 1993 castor oil residue on the exterior, indicative
 
of the use of Celvacene lubricant, which includes castor oil and cellulose
 
acetate butyrate.Celvacene, specified
 
for use by the original penetration
 
supplier, can cause degradation
 
of polyurethane
 
as follows. The cellulose
 
acetate butyrate component
 
breaks down in the presence of moisture, producing
 
butyric acid, which in turn catalyses
 
hydrolysis
 
of the seal polymer. The hydrolysis
 
slowly degrades the polyurethane
 
material.
 
Under accident conditions, the seal degradation
 
may be accelerated.
 
The original penetration
 
supplier, Bunker-Ramo, no longer supplies such assemblies.
 
Si ilar electrical
 
penetration
 
assemblies
 
have been supplied by Amphenol6w-butThis
 
company also no longer supplies such assemblies. -A 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, Director Division of Operating
 
===Reactor Support Office of Nuclear Reactor Regulation===
Technical
 
contacts:
C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachment:
List of Recently Issued NRC Information
 
Notices Document Name: PRESBOUN.IN
 
*SEE PREVIOUS CONCURRENCES
 
D/DORS:NRR
 
BKGrimes 03/ /93U*C/OGCB:DORS:NRR*RPB:ADM
 
*D/DRIL:NRR
 
C/RVIB:DRIL:NRR
 
===GHMarcus TechEd CERossi LJNorrholm===
03/05/93 04/13/92 03/03/93 02/271/93*OGCB:DORS:NRR
 
*RESINSP/RV
 
*RVIB:DRIL:NRR
 
*SC/RVIB:DRIL:NRR
 
CVHodge RBarr KNaidu GCwalina 06/03/92 06/03/92 01/11/93 02/27/93 IN 93-XX March xx, 1993 degradation
 
of polyurethane
 
as follows. Ihe cellulose
 
acetate butyrate ccuponent
 
breaks dawm in the presence of irsture, producing
 
butyric acid, whici in turn catalyses
 
hydrolysis
 
of the seal polymer. The hydrolysis
 
slowly degrades the polyurethane
 
material.
 
Mier accident cmditins,, the seal degradation
 
may be accelerated.
 
The original penetration
 
supplier, Bunker-Ramo, is no longer in the business.Similar electrical
 
penetraticn
 
assemblies
 
have been splied -by Anphenol, but this ccapany also is no lcnger in the hksiness.
 
Ihe licensee at Trojan replaced its Eunker-Ramo
 
electrical
 
penetration
 
assemblies
 
with Ckmax electrical
 
penetration
 
assemblies.
 
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 aPqrcpriate
 
Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Cperating
 
===Reactor Support Office of Nuclear Reactor Regulation===
Technical
 
contacts:
C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naid, NRR (301) 504-2980 Attachment:
List of Recently Issued NR Information
 
Notices D x:mnt Name: PRESBCEXI
 
IN*SEE PREVIOUS aONCNRRENcS
 
D/DORS:NRR
 
C/OGCB:DORS:MMR*RPB:ADM
 
*D/MlUL:NfR
 
BI~rimes Grfrcus64W
 
Tech~d CEossi 02/ /93 03/S /93 04/13/92 03/03/93*OGCB:DORS:NRR
 
*PMINSP/RV
 
*REV :RI:NR:R *SC/RVIB:DR:M;R*C/RIB:WIL:NRR
 
CvHodge RBarr .Naidu Gwalina mJ~orrhobii
 
06/03/92 06/03/92 01/11/93 02/27/93 02/27/93
-IN 93-XX February 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 Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
 
===Reactor Support Office of Nuclear Reactor Regulation===
Technical
 
contacts: C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachment:
List of Recently Issued NRC Information
 
Notices Document Name: PRESBOUN.IN
 
*SEE PREVIOUS CONCURRENCES
 
*OGCB:DORS:NRR
 
CVHodge 06/03/92 D/DORS:NRR
 
BKGrimes 02/ /93*RESINSP/RV
 
RBarr 06/03/92 C/OGCB:DORS:NRR*RPB:ADM
 
GHMarcus TechEd 02/ /93 04/13/92*RVIB:DRIL:NRR
 
SC/RVIB:DRIL:NRR
 
KNaidu GCwalina 01/11/93 02/ /93 CYRU:DRIL:NRR
 
LJNorrholm
 
02/ /93 IN 93-XX January 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 Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
 
===Reactor Support Office of Nuclear Reactor Regulation===
Technical
 
contacts: C. Vernon Hodge, (301) 504-1861 NRR Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachment:
List of Recently Issued NRC Information
 
Notices Document Name: PRESBOUN.IN
 
*SEE PREVIOUS*OGCB: DORS:NRF CVHodge 06/03/92 CONCURRENCES
 
D/DORS:NRR
 
BKGrimes 01/ /93 Z *RESINSP/RV
 
RBarr 06/03/92 C/OGCB:DORS:NRR*RPB:ADM
 
GHMarcus TechEd 01/ /93 04/13/92*RVIB:DRIL:NRR
 
IB:DRIL:NRR
 
KNaidu Gaina 01/11/93 /93 D/DRIL:NRR
 
C--#-CERossi g gmlL:NRR 01/j /93 DD:DRIL:NRR
 
RZimmerman
 
01/ /93 IN 93-XX January , 1993 ., under loss of coolant accident (LOCA) conditions.
 
Premature
 
degradation
 
of the insulation
 
covering the electrical
 
connections
 
can expose the connections
 
to an adverse environment
 
during a LOCA. A brief survey of these LERs is included in Attachment
 
1.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
 
Off ce of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
 
Reactor Office of Nuclear Reactor Regu Support lation Technical
 
contacts: C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal (301)Naidu, NRR 504-2980 Attachments:
1. Survey of Licensee Event Reports (LERs)2. List of Recently Issued NRC Information
 
Notices Document Name: PRESBOUN.IN
 
*SEE PREVIOUS CONCURRENCES
 
*OGCB:DORSONRR
 
*RESINSP/RV
 
CVHodge USA RBarr 06/03/92 0413 06/03/92 D/DORS:NRR
 
BKGrimes 01/f /93! n IB:DRIL:NRR
 
KNai du 01/11/93 C/OGCB:DORS:NRR*RPB:ADM
 
GHMarcus TechEd 01/ /93 04/13/92 C/RVIB:DRIL:NRR
 
D/DRIL:NRR
 
LJNorrholm
 
CERossi 01/ /93 01/ /93..I zi' k I '. ,.-: I , :
K>IN 93-XX January xx, 1993 identify excessive
 
leakage of EPA seals indicating
 
possible degradation
 
from moisture intrusion.
 
Degraded seals can cause breach of containment
 
integrity under loss of coolant accident (LOCA) conditions.
 
Premature
 
degradation
 
of the insulation
 
covering the electrical
 
connections
 
can expose the connections
 
to an adverse environment
 
during a LOCA. A brief survey of these LERs is included in Attachment
 
1.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, Director Division of Operating
 
===Reactor Support Office of Nuclear Reactor Regulation===
Technical
 
contacts: C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachments:
1. Survey of Licensee Event Reports (LERs)2. List of Recently Issued NRC Information
 
Notices Document Name: PRESBOUN.IN
 
*SEE PREVIOUS CONCURRENCES
 
OGCB:DORS:NRR
 
CVHodge V@06/o3/92 01 /Iq/3 D/DORS:NRR
 
BKGrimes 01/ /93 RESINSP/RV
 
RBarr w C/OGCB:DORS:NRR*RPB:ADM
 
GHMarcus TechEd 01/ /93 04/13/92*RVIB:DRIL:NRR
 
SC/RVIB:DRIL:NRR
 
KNaidu GCwalina 01/11/93 01/ /93 D/DRIL:NRR
 
CERossi 01/ /93 C/RVIB:DRIL:NRR
 
LJNorrholm
 
01/ /93 of EPA seals represent
 
violations
 
of Containment
 
integrity
 
and environmental
 
qualification
 
deficiencies
 
in EPA components
 
indicatepe
 
s m -/~u4n-deiiP
 
coddia")loss~bf(oolant
 
accident (LOCA) co'nditions.
 
A brief survey of these LERs I4B'Cincluded
 
in .ttachmet
 
A im This information
 
notice requires you have any questions
 
about the of the technical
 
contacts listed Reactor Regulation (NRR) project no specific action or written response.
 
If information
 
in this notice, please contact one below or the appropriate
 
Office of Nuclear manager.Charles E. Rossi, Director Division of Operational
 
===Events Assessment===
Office of Nuclear Reactor Regulation
 
Technical
 
contacts: Vern Hodge, NRR (301) 504-1861 Rob Barr, RV (503) 556-3751 Attachments:
1. Survey of Licensee Event Reports (LERs)2. List of Recently Issued NRC Information
 
Notices Document Name: BUNK0403 REV 19 OGCB:DOEA:NRR
 
CVHodge 04/ /92 RESINSP/RV


==Description of Circumstances==
RBarr 04/ /92 D/DOEA:NRR
In July 1987 and in October 1989, the licensee for the Trojan Nuclear Plant,the Portland General Electric Company, reported problems with containment airleakage through its Bunker-Ramo electrical penetration assembly seals[licensee event reports (LERs) 50-344/87-11 and 50-344/89-23]. In July andAugust 1991, the NRC inspected the use of containment electrical penetrationassembly seals at Trojan and concluded that the licensee had not establishedan effective program for trending and evaluating electrical penetrationassembly seal leakage (Inspection Report 50-344/91-27). On October 28, 1991,while the plant was in a refueling outage, the licensee reported to the NRCthat in the originally installed electrical penetration assemblies, the seal(polyurethane) and lubricant (Celvacene or Glycerin) materials wereinappropriate for the application (LER 50-344/91-11-01). The licenseeconcluded that these materials may cause seal degradation and that the sealsmay become degraded if subjected to design basis accident conditions formoisture or temperature. The licensee replaced the electrical penetrationassembly seal with an environmentally qualified ethylene propylene rubber sealand added a silicone rubber backup O-ring to the outer face of each electricalpenetration assembly module. The licensee subsequently replaced all theBunker-Ramo electrical penetration assemblies with Conax assemblies.DiscussionElectrical penetration assemblies provide electrical continuity for fieldcables penetrating the containment and maintain containment integrity.9303250146 -PW a: f1) t arC;02S ISoC'aoII \l


.aIN 93-25April 1, 1993 Degraded electrical penetration assemblies can adversely affect containmentintegrity by allowing excessive leakage from the containment under accidentconditions.The Bunker-Ramo electrical penetration assembly consists of a cylindricalstructure with circular header plates at each end. One header plate isdesigned to be bolted to a flange on the containment liner plate penetrationnozzle. Containment integrity is achieved by two C-cup seals between theflanges. In the Bunker-Ramo design, a helical spring-loaded polyurethane sealis mounted at each end of the-electrical penetration assembly. Eachelectrical penetration assembly has two seals, an outer one, nominally of8.9 cm [3.5 inch] diameter, and an inner one, of nominally 6.4 cm [2.5 inch]diameter. The outer seal functions as part of the containment boundary whilethe inner seal functions as an outer seal test pressure boundary. Theelectrical penetration assembly header plate is equipped with a connection towhich a pressure indicating gauge can be attached to monitor seal leakage.At the Trojan plant, the qualified life of the seal had not been accuratelyestablished. The simultaneous effects of corrosion and moisture at normaltemperature had not been taken into account. The established longevity wasnot corrected after factoring in the actual degradation observed duringperiodic surveillance of the individual seals.' Also, an administrativemechanism was not in place to replace the seals before their estimatedqualified life expired. The original seal material in the Bunker-Ramoelectrical penetration assembly has polyester''urethane manufactured by ParkerPacking Company (Parker) under the trade name of Parkerthane (Parker CompoundNo. P4611). Parker, which manufactures both polyester urethane and polyetherurethane seals, indicated in its catalog that polyester urethane maintainscritical characteristics up to 6 years while polyether urethane maintainscritical characteristics up to 10 years.The polyester urethane (the originally installed seal material) was determinedinadequate for several reasons:Short expected life (independently estimated at 2-5 years under someconditions)Incompatibility with water (hydrolysis shortens life)Incompatibility with high temperature (acceleration of hydrolysis)Susceptibility to compression-set (a slowly acquired permanentdeformation)The licensee used different lubricants over the years. In 1987, the licenseedetermined that three seals had failed because they were erroneouslylubricated with an incompatible (silicone) grease. After examination of sealfailures that occurred in 1991, Parker determined that the failed seals hadcastor oil residue on the exterior, indicative of the use of Celvacenelubricant', which'includes castor oil and cellulose acetate butyrate.Celvacene, specified for use by the original penetration supplier, can cause
CERossi 04/ /92 RVIB:DRIS:NRR


IN 93-25April 1, 1993 degradation of polyurethane as follows. The cellulose acetate butyratecomponent breaks down in the presence of moisture, producing butyric acid,which in turn catalyses hydrolysis of the seal polymer. The hydrolysis slowlydegrades the polyurethane material. Under accident conditions, the sealdegradation may be accelerated.The original penetration supplier, Bunker-Ramo, no longer supplies suchassemblies. Similar electrical penetration assemblies have been supplied byAmphenol, but this company also no longer supplies such assemblies.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contacts: C. Vernon Hodge, NRR(301) 504-1861Robert C. Barr, Region V(509) 377-2627Kamal Naidu, NRR(301) 504-2980Attachment:List of Receitly Issued NRC Information Notices
KNaidu 04/ /92 C/OGCB:DOEA:NRR


14AttachmentIN 93-25April 1, 1993Page I of ILIST OF RECENTLY ISSUEDKRC INFORMlATION NOTICESa4c40L '0I UJ :30A.UflU InrormationNotice No.93-2493-2393-2293-2193-2093-1993-18)93-1793-16SubjectDistribution ofRevision 7 of PURE6-1021.0Operator LicensingExaminer Standards"Weschler InstrumentsNodel 252 SwitchboardPetersTriping of Klockner-Nfoeller Molded-CaseCircuit Breakers due toSupport Level FailureSummary of NRC StaffObservations Compiledduring Engineering Auditsor Inspections of Licen-see Erosion/CorrosionProgramsThermal Fatigue Crackingof Feedwater Piping to*Steam GeneratorsSlab Hopper BulgingPortable Moisture-DensityGauge User Responsibilitiesduring Field OperationsSafety Systems Responseto Loss of Coolant andLoss of Offs1te PowerFailures of Nut-LockingDevices in Check ValvesIssuane Issued to03/31/93 All holders of orater andsenior operator eienses atnuclear power reactors.03/31/93 All holders of OLs or CPsfor nuclear power reactors.03/26/93 All holders of OLs or CPsfor nuclear power reactors.03/25/93 All holders of OLs or CPsfor light water nuclearpower reactors.Ii03/24/93 All holders of OLs or CPsfor PWRs supplied byWestinghouse or CombustionEngineering.03/17/92 All nuclear fuel cyclelicensees.03/10/93 All U.S. Nuclear RegulatoryCommission licensees thatpossess moisture-densitygauges.03/08/93 All holders of OLs or CPsfor nuclear power reactors.02/19/93 All holders of OLs or CPsfor nuclear power reactors.2I(0000W O1 c1n 2IL I-I U4):zUZ aFA.~OL -Operating LicenseCP -Construction Permit
CHBerlinger


IN 93-25April 1, 1993 degradation of polyurethane as follows. The cellulose acetate butyratecomponent breaks down in the presence of moisture, producing butyric acid,which in turn catalyses hydrolysis of the seal polymer. The hydrolysis slowlydegrades the polyurethane material. Under accident conditions, the sealdegradation may be accelerated.The original penetration supplier, Bunker-Ramo, no longer supplies suchassemblies. Similar electrical penetration assemblies have been supplied byAmphenol, but this company also no longer supplies such assemblies.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.orig /s/'d by BKGrimesBrian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contacts:C. Vernon Hodge, NRR(301) 504-1861Robert C. Barr, Region V(509) 377-2627Kamal Naidu, NRR(301) 504-2980Attachment:List of Recently Issued NRC Information Notices*SEE PRMV a CONCURRENCES*C/OGCB:DORS:NRR*RPB:ADMGHMarcus TechEd03/05/93 04/13/92*D/DRIL:NRRCERossi03/03/93*C/RVIB:DRIL:NRRLJNorrholm02/27/93*OGCB: DORS:NRRCVHodge06/03/92*RESINSP/RVRBarr06/03/92*RVIB:DRIL:NRRKNaidu01/11/93*SC/RVIB:DRIL:NRRGCwallna02/27/93DOCUMENT NAME: 93-25.IN
04/ /92 RPB:ADM TechEd J'Ma;, )04/13 /92 ROAB:DSP:NRR


IN 93-XXMarch xx, 1993 castor oil residue on the exterior, indicative of the use of Celvacenelubricant, which includes castor oil and cellulose acetate butyrate.Celvacene, specified for use by the original penetration supplier, can causedegradation of polyurethane as follows. The cellulose acetate butyratecomponent breaks down in the presence of moisture, producing butyric acid,which in turn catalyses hydrolysis of the seal polymer. The hydrolysis slowlydegrades the polyurethane material. Under accident conditions, the sealdegradation may be accelerated.The original penetration supplier, Bunker-Ramo, no longer supplies suchassemblies. Si ilar electrical penetration assemblies have been supplied byAmphenol6w-butThis company also no longer supplies such assemblies. -AThis information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contacts: C. Vernon Hodge, NRR(301) 504-1861Robert C. Barr, Region V(509) 377-2627Kamal Naidu, NRR(301) 504-2980Attachment:List of Recently Issued NRC Information NoticesDocument Name: PRESBOUN.IN*SEE PREVIOUS CONCURRENCESD/DORS:NRRBKGrimes03/ /93U*C/OGCB:DORS:NRR*RPB:ADM *D/DRIL:NRR C/RVIB:DRIL:NRRGHMarcus TechEd CERossi LJNorrholm03/05/93 04/13/92 03/03/93 02/271/93*OGCB:DORS:NRR *RESINSP/RV *RVIB:DRIL:NRR *SC/RVIB:DRIL:NRRCVHodge RBarr KNaidu GCwalina06/03/92 06/03/92 01/11/93 02/27/93 IN 93-XXMarch xx, 1993 degradation of polyurethane as follows. Ihe cellulose acetate butyrateccuponent breaks dawm in the presence of irsture, producing butyric acid,whici in turn catalyses hydrolysis of the seal polymer. The hydrolysis slowlydegrades the polyurethane material. Mier accident cmditins,, the sealdegradation may be accelerated.The original penetration supplier, Bunker-Ramo, is no longer in the business.Similar electrical penetraticn assemblies have been splied -by Anphenol, butthis ccapany also is no lcnger in the hksiness. Ihe licensee at Trojanreplaced its Eunker-Ramo electrical penetration assemblies with Ckmaxelectrical penetration assemblies.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the aPqrcpriate Office ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Cperating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contacts: C. Vernon Hodge, NRR(301) 504-1861Robert C. Barr, Region V(509) 377-2627Kamal Naid, NRR(301) 504-2980Attachment:List of Recently Issued NR Information NoticesD x:mnt Name: PRESBCEXI IN*SEE PREVIOUS aONCNRRENcSD/DORS:NRR C/OGCB:DORS:MMR*RPB:ADM *D/MlUL:NfRBI~rimes Grfrcus64W Tech~d CEossi02/ /93 03/S /93 04/13/92 03/03/93*OGCB:DORS:NRR *PMINSP/RV *REV :RI:NR:R *SC/RVIB:DR:M;R*C/RIB:WIL:NRRCvHodge RBarr .Naidu Gwalina mJ~orrhobii06/03/92 06/03/92 01/11/93 02/27/93 02/27/93
SMazumdar 04/ /92}}
-IN 93-XXFebruary xx, 1993 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contacts:C. Vernon Hodge, NRR(301) 504-1861Robert C. Barr, Region V(509) 377-2627Kamal Naidu, NRR(301) 504-2980Attachment:List of Recently Issued NRC Information NoticesDocument Name:PRESBOUN.IN*SEE PREVIOUS CONCURRENCES*OGCB:DORS:NRRCVHodge06/03/92D/DORS:NRRBKGrimes02/ /93*RESINSP/RVRBarr06/03/92C/OGCB:DORS:NRR*RPB:ADMGHMarcus TechEd02/ /93 04/13/92*RVIB:DRIL:NRR SC/RVIB:DRIL:NRRKNaidu GCwalina01/11/93 02/ /93CYRU:DRIL:NRRLJNorrholm02/ /93 IN 93-XXJanuary xx, 1993 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contacts:C. Vernon Hodge,(301) 504-1861NRRRobert C. Barr, Region V(509) 377-2627Kamal Naidu, NRR(301) 504-2980Attachment:List of Recently Issued NRC Information NoticesDocument Name:PRESBOUN.IN*SEE PREVIOUS*OGCB: DORS:NRFCVHodge06/03/92CONCURRENCESD/DORS:NRRBKGrimes01/ /93Z *RESINSP/RVRBarr06/03/92C/OGCB:DORS:NRR*RPB:ADMGHMarcus TechEd01/ /93 04/13/92*RVIB:DRIL:NRR IB:DRIL:NRRKNaidu Gaina01/11/93 /93D/DRIL:NRR C--#-CERossig gmlL:NRR01/j /93DD:DRIL:NRRRZimmerman01/ /93 IN 93-XXJanuary , 1993 .,under loss of coolant accident (LOCA) conditions. Premature degradation ofthe insulation covering the electrical connections can expose the connectionsto an adverse environment during a LOCA. A brief survey of these LERs isincluded in Attachment 1.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Off ce ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating ReactorOffice of Nuclear Reactor ReguSupportlationTechnical contacts:C. Vernon Hodge, NRR(301) 504-1861Robert C. Barr, Region V(509) 377-2627Kamal(301)Naidu, NRR504-2980Attachments:1. Survey of Licensee Event Reports (LERs)2. List of Recently Issued NRC Information NoticesDocument Name: PRESBOUN.IN*SEE PREVIOUS CONCURRENCES*OGCB:DORSONRR *RESINSP/RVCVHodge USA RBarr06/03/92 0413 06/03/92D/DORS:NRRBKGrimes01/f /93! n IB:DRIL:NRRKNai du01/11/93C/OGCB:DORS:NRR*RPB:ADMGHMarcus TechEd01/ /93 04/13/92C/RVIB:DRIL:NRR D/DRIL:NRRLJNorrholm CERossi01/ /93 01/ /93..I zi' k I '. ,.-: I , :
K>IN 93-XXJanuary xx, 993identify excessive leakage of EPA seals indicating possible degradation frommoisture intrusion. Degraded seals can cause breach of containment integrityunder loss of coolant accident (LOCA) conditions. Premature degradation ofthe insulation covering the electrical connections can expose the connectionsto an adverse environment during a LOCA. A brief survey of these LERs isincluded in Attachment 1.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contacts:C. Vernon Hodge, NRR(301) 504-1861Robert C. Barr, Region V(509) 377-2627Kamal Naidu, NRR(301) 504-2980Attachments:1. Survey of Licensee Event Reports (LERs)2. List of Recently Issued NRC Information NoticesDocument Name:PRESBOUN.IN*SEE PREVIOUS CONCURRENCESOGCB:DORS:NRRCVHodge V@06/o3/9201 /Iq/3D/DORS:NRRBKGrimes01/ /93RESINSP/RVRBarr wC/OGCB:DORS:NRR*RPB:ADMGHMarcus TechEd01/ /93 04/13/92*RVIB:DRIL:NRR SC/RVIB:DRIL:NRRKNaidu GCwalina01/11/93 01/ /93D/DRIL:NRRCERossi01/ /93C/RVIB:DRIL:NRRLJNorrholm01/ /93 of EPA seals represent violations of Containment integrity and environmentalqualification deficiencies in EPA components indicatepe s m -/~u4n-deiiP coddia")loss~bf(oolant accident (LOCA) co'nditions. A brief survey of these LERs I4B'Cincluded in .ttachmet A imThis information notice requiresyou have any questions about theof the technical contacts listedReactor Regulation (NRR) projectno specific action or written response. Ifinformation in this notice, please contact onebelow or the appropriate Office of Nuclearmanager.Charles E. Rossi, DirectorDivision of Operational Events AssessmentOffice of Nuclear Reactor RegulationTechnical contacts:Vern Hodge, NRR(301) 504-1861Rob Barr, RV(503) 556-3751Attachments:1. Survey of Licensee Event Reports (LERs)2. List of Recently Issued NRC Information NoticesDocument Name: BUNK0403 REV 19OGCB:DOEA:NRRCVHodge04/ /92RESINSP/RVRBarr04/ /92D/DOEA:NRRCERossi04/ /92RVIB:DRIS:NRRKNaidu04/ /92C/OGCB:DOEA:NRRCHBerlinger04/ /92RPB:ADMTechEd J'Ma;, )04/13 /92ROAB:DSP:NRRSMazumdar04/ /92  
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Revision as of 13:53, 31 August 2018

Electrical Penetration Assembly Degradation
ML031080020
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: 04/01/1993
From: Grimes B K
Office of Nuclear Reactor Regulation
To:
References
IN-93-025, NUDOCS 9303250146
Download: ML031080020 (12)
v • d • e


I'- 'UNITED STATES NUCLEAR REGULATORY

COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 April 1, 1993 NRC INFORMATION

NOTICE 93-25: ELECTRICAL

PENETRATION

ASSEMBLY DEGRADATION

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 problems that could result in degradation

of electrical

penetration

assembly seals. This information

notice focuses on the containment

integrity

function of these seals. It is expected that recipients

will review the information

for applicability

to their facilities

and consider actions, as appropriate, to avoid similar problems.

However, suggestions

contained

in this information

notice are not NRC requirements;

therefore, no specific action or written response is required.Description

of Circumstances

In July 1987 and in October 1989, the licensee for the Trojan Nuclear Plant, the Portland General Electric Company, reported problems with containment

air leakage through its Bunker-Ramo

electrical

penetration

assembly seals[licensee

event reports (LERs) 50-344/87-11 and 50-344/89-23].

In July and August 1991, the NRC inspected

the use of containment

electrical

penetration

assembly seals at Trojan and concluded

that the licensee had not established

an effective

program for trending and evaluating

electrical

penetration

assembly seal leakage (Inspection

Report 50-344/91-27).

On October 28, 1991, while the plant was in a refueling

outage, the licensee reported to the NRC that in the originally

installed

electrical

penetration

assemblies, the seal (polyurethane)

and lubricant (Celvacene

or Glycerin)

materials

were inappropriate

for the application (LER 50-344/91-11-01).

The licensee concluded

that these materials

may cause seal degradation

and that the seals may become degraded if subjected

to design basis accident conditions

for moisture or temperature.

The licensee replaced the electrical

penetration

assembly seal with an environmentally

qualified

ethylene propylene

rubber seal and added a silicone rubber backup O-ring to the outer face of each electrical

penetration

assembly module. The licensee subsequently

replaced all the Bunker-Ramo

electrical

penetration

assemblies

with Conax assemblies.

Discussion

Electrical

penetration

assemblies

provide electrical

continuity

for field cables penetrating

the containment

and maintain containment

integrity.

9303250146

-PW a: f1) t arC;02S ISoC'aoI I \l

.a IN 93-25 April 1, 1993 Degraded electrical

penetration

assemblies

can adversely

affect containment

integrity

by allowing excessive

leakage from the containment

under accident conditions.

The Bunker-Ramo

electrical

penetration

assembly consists of a cylindrical

structure

with circular header plates at each end. One header plate is designed to be bolted to a flange on the containment

liner plate penetration

nozzle. Containment

integrity

is achieved by two C-cup seals between the flanges. In the Bunker-Ramo

design, a helical spring-loaded

polyurethane

seal is mounted at each end of the-electrical

penetration

assembly.

Each electrical

penetration

assembly has two seals, an outer one, nominally

of 8.9 cm [3.5 inch] diameter, and an inner one, of nominally

6.4 cm [2.5 inch]diameter.

The outer seal functions

as part of the containment

boundary while the inner seal functions

as an outer seal test pressure boundary.

The electrical

penetration

assembly header plate is equipped with a connection

to which a pressure indicating

gauge can be attached to monitor seal leakage.At the Trojan plant, the qualified

life of the seal had not been accurately

established.

The simultaneous

effects of corrosion

and moisture at normal temperature

had not been taken into account. The established

longevity

was not corrected

after factoring

in the actual degradation

observed during periodic surveillance

of the individual

seals.' Also, an administrative

mechanism

was not in place to replace the seals before their estimated qualified

life expired. The original seal material in the Bunker-Ramo

electrical

penetration

assembly has polyesterurethane

manufactured

by Parker Packing Company (Parker) under the trade name of Parkerthane (Parker Compound No. P4611). Parker, which manufactures

both polyester

urethane and polyether urethane seals, indicated

in its catalog that polyester

urethane maintains critical characteristics

up to 6 years while polyether

urethane maintains critical characteristics

up to 10 years.The polyester

urethane (the originally

installed

seal material)

was determined

inadequate

for several reasons: Short expected life (independently

estimated

at 2-5 years under some conditions)

Incompatibility

with water (hydrolysis

shortens life)Incompatibility

with high temperature (acceleration

of hydrolysis)

Susceptibility

to compression-set (a slowly acquired permanent deformation)

The licensee used different

lubricants

over the years. In 1987, the licensee determined

that three seals had failed because they were erroneously

lubricated

with an incompatible (silicone)

grease. After examination

of seal failures that occurred in 1991, Parker determined

that the failed seals had castor oil residue on the exterior, indicative

of the use of Celvacene lubricant', which'includes

castor oil and cellulose

acetate butyrate.Celvacene, specified

for use by the original penetration

supplier, can cause

IN 93-25 April 1, 1993 degradation

of polyurethane

as follows. The cellulose

acetate butyrate component

breaks down in the presence of moisture, producing

butyric acid, which in turn catalyses

hydrolysis

of the seal polymer. The hydrolysis

slowly degrades the polyurethane

material.

Under accident conditions, the seal degradation

may be accelerated.

The original penetration

supplier, Bunker-Ramo, no longer supplies such assemblies.

Similar electrical

penetration

assemblies

have been supplied by Amphenol, but this company also no longer supplies such assemblies.

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, Director Division of Operating

Reactor Support Office of Nuclear Reactor Regulation

Technical

contacts:

C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachment:

List of Receitly Issued NRC Information

Notices

14 Attachment

IN 93-25 April 1, 1993 Page I of I LIST OF RECENTLY ISSUED KRC INFORMlATION

NOTICES a 4c 40L '0 I UJ :3 0 A.UflU Inrormation

Notice No.93-24 93-23 93-22 93-21 93-20 93-19 93-18)93-17 93-16 Subject Distribution

of Revision 7 of PURE6-1021.

0Operator

Licensing Examiner Standards" Weschler Instruments

Nodel 252 Switchboard

Peters Triping of Klockner-Nfoeller Molded-Case

Circuit Breakers due to Support Level Failure Summary of NRC Staff Observations

Compiled during Engineering

Audits or Inspections

of Licen-see Erosion/Corrosion

Programs Thermal Fatigue Cracking of Feedwater

Piping to*Steam Generators

Slab Hopper Bulging Portable Moisture-Density

Gauge User Responsibilities

during Field Operations

Safety Systems Response to Loss of Coolant and Loss of Offs1te Power Failures of Nut-Locking

Devices in Check Valves Issuane Issued to 03/31/93 All holders of orater and senior operator eienses at nuclear power reactors.03/31/93 All holders of OLs or CPs for nuclear power reactors.03/26/93 All holders of OLs or CPs for nuclear power reactors.03/25/93 All holders of OLs or CPs for light water nuclear power reactors.I i 03/24/93 All holders of OLs or CPs for PWRs supplied by Westinghouse

or Combustion

Engineering.

03/17/92 All nuclear fuel cycle licensees.

03/10/93 All U.S. Nuclear Regulatory

Commission

licensees

that possess moisture-density

gauges.03/08/93 All holders of OLs or CPs for nuclear power reactors.02/19/93 All holders of OLs or CPs for nuclear power reactors.2 I(00 00 W O 1 c1 n 2 IL I-I U 4): zU Z a FA.~OL -Operating

License CP -Construction

Permit

IN 93-25 April 1, 1993 degradation

of polyurethane

as follows. The cellulose

acetate butyrate component

breaks down in the presence of moisture, producing

butyric acid, which in turn catalyses

hydrolysis

of the seal polymer. The hydrolysis

slowly degrades the polyurethane

material.

Under accident conditions, the seal degradation

may be accelerated.

The original penetration

supplier, Bunker-Ramo, no longer supplies such assemblies.

Similar electrical

penetration

assemblies

have been supplied by Amphenol, but this company also no longer supplies such assemblies.

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.orig /s/'d by BKGrimes Brian K. Grimes, Director Division of Operating

Reactor Support Office of Nuclear Reactor Regulation

Technical

contacts: C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachment:

List of Recently Issued NRC Information

Notices*SEE PRMV a CONCURRENCES

  • C/OGCB:DORS:NRR*RPB:ADM

GHMarcus TechEd 03/05/93 04/13/92*D/DRIL:NRR

CERossi 03/03/93*C/RVIB:DRIL:NRR

LJNorrholm

02/27/93*OGCB: DORS:NRR CVHodge 06/03/92*RESINSP/RV

RBarr 06/03/92*RVIB:DRIL:NRR

KNaidu 01/11/93*SC/RVIB:DRIL:NRR

GCwallna 02/27/93 DOCUMENT NAME: 93-25.IN

IN 93-XX March xx, 1993 castor oil residue on the exterior, indicative

of the use of Celvacene lubricant, which includes castor oil and cellulose

acetate butyrate.Celvacene, specified

for use by the original penetration

supplier, can cause degradation

of polyurethane

as follows. The cellulose

acetate butyrate component

breaks down in the presence of moisture, producing

butyric acid, which in turn catalyses

hydrolysis

of the seal polymer. The hydrolysis

slowly degrades the polyurethane

material.

Under accident conditions, the seal degradation

may be accelerated.

The original penetration

supplier, Bunker-Ramo, no longer supplies such assemblies.

Si ilar electrical

penetration

assemblies

have been supplied by Amphenol6w-butThis

company also no longer supplies such assemblies. -A 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, Director Division of Operating

Reactor Support Office of Nuclear Reactor Regulation

Technical

contacts:

C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachment:

List of Recently Issued NRC Information

Notices Document Name: PRESBOUN.IN

  • SEE PREVIOUS CONCURRENCES

D/DORS:NRR

BKGrimes 03/ /93U*C/OGCB:DORS:NRR*RPB:ADM

  • D/DRIL:NRR

C/RVIB:DRIL:NRR

GHMarcus TechEd CERossi LJNorrholm

03/05/93 04/13/92 03/03/93 02/271/93*OGCB:DORS:NRR

  • RESINSP/RV
  • RVIB:DRIL:NRR
  • SC/RVIB:DRIL:NRR

CVHodge RBarr KNaidu GCwalina 06/03/92 06/03/92 01/11/93 02/27/93 IN 93-XX March xx, 1993 degradation

of polyurethane

as follows. Ihe cellulose

acetate butyrate ccuponent

breaks dawm in the presence of irsture, producing

butyric acid, whici in turn catalyses

hydrolysis

of the seal polymer. The hydrolysis

slowly degrades the polyurethane

material.

Mier accident cmditins,, the seal degradation

may be accelerated.

The original penetration

supplier, Bunker-Ramo, is no longer in the business.Similar electrical

penetraticn

assemblies

have been splied -by Anphenol, but this ccapany also is no lcnger in the hksiness.

Ihe licensee at Trojan replaced its Eunker-Ramo

electrical

penetration

assemblies

with Ckmax electrical

penetration

assemblies.

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 aPqrcpriate

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

Reactor Support Office of Nuclear Reactor Regulation

Technical

contacts:

C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naid, NRR (301) 504-2980 Attachment:

List of Recently Issued NR Information

Notices D x:mnt Name: PRESBCEXI

IN*SEE PREVIOUS aONCNRRENcS

D/DORS:NRR

C/OGCB:DORS:MMR*RPB:ADM

  • D/MlUL:NfR

BI~rimes Grfrcus64W

Tech~d CEossi 02/ /93 03/S /93 04/13/92 03/03/93*OGCB:DORS:NRR

  • PMINSP/RV
  • REV :RI:NR:R *SC/RVIB:DR:M;R*C/RIB:WIL:NRR

CvHodge RBarr .Naidu Gwalina mJ~orrhobii

06/03/92 06/03/92 01/11/93 02/27/93 02/27/93

-IN 93-XX February 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 Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating

Reactor Support Office of Nuclear Reactor Regulation

Technical

contacts: C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachment:

List of Recently Issued NRC Information

Notices Document Name: PRESBOUN.IN

  • SEE PREVIOUS CONCURRENCES
  • OGCB:DORS:NRR

CVHodge 06/03/92 D/DORS:NRR

BKGrimes 02/ /93*RESINSP/RV

RBarr 06/03/92 C/OGCB:DORS:NRR*RPB:ADM

GHMarcus TechEd 02/ /93 04/13/92*RVIB:DRIL:NRR

SC/RVIB:DRIL:NRR

KNaidu GCwalina 01/11/93 02/ /93 CYRU:DRIL:NRR

LJNorrholm

02/ /93 IN 93-XX January 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 Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating

Reactor Support Office of Nuclear Reactor Regulation

Technical

contacts: C. Vernon Hodge, (301) 504-1861 NRR Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachment:

List of Recently Issued NRC Information

Notices Document Name: PRESBOUN.IN

  • SEE PREVIOUS*OGCB: DORS:NRF CVHodge 06/03/92 CONCURRENCES

D/DORS:NRR

BKGrimes 01/ /93 Z *RESINSP/RV

RBarr 06/03/92 C/OGCB:DORS:NRR*RPB:ADM

GHMarcus TechEd 01/ /93 04/13/92*RVIB:DRIL:NRR

IB:DRIL:NRR

KNaidu Gaina 01/11/93 /93 D/DRIL:NRR

C--#-CERossi g gmlL:NRR 01/j /93 DD:DRIL:NRR

RZimmerman

01/ /93 IN 93-XX January , 1993 ., under loss of coolant accident (LOCA) conditions.

Premature

degradation

of the insulation

covering the electrical

connections

can expose the connections

to an adverse environment

during a LOCA. A brief survey of these LERs is included in Attachment

1.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

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

Reactor Office of Nuclear Reactor Regu Support lation Technical

contacts: C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal (301)Naidu, NRR 504-2980 Attachments:

1. Survey of Licensee Event Reports (LERs)2. List of Recently Issued NRC Information

Notices Document Name: PRESBOUN.IN

  • SEE PREVIOUS CONCURRENCES
  • OGCB:DORSONRR
  • RESINSP/RV

CVHodge USA RBarr 06/03/92 0413 06/03/92 D/DORS:NRR

BKGrimes 01/f /93! n IB:DRIL:NRR

KNai du 01/11/93 C/OGCB:DORS:NRR*RPB:ADM

GHMarcus TechEd 01/ /93 04/13/92 C/RVIB:DRIL:NRR

D/DRIL:NRR

LJNorrholm

CERossi 01/ /93 01/ /93..I zi' k I '. ,.-: I , :

K>IN 93-XX January xx, 1993 identify excessive

leakage of EPA seals indicating

possible degradation

from moisture intrusion.

Degraded seals can cause breach of containment

integrity under loss of coolant accident (LOCA) conditions.

Premature

degradation

of the insulation

covering the electrical

connections

can expose the connections

to an adverse environment

during a LOCA. A brief survey of these LERs is included in Attachment

1.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, Director Division of Operating

Reactor Support Office of Nuclear Reactor Regulation

Technical

contacts: C. Vernon Hodge, NRR (301) 504-1861 Robert C. Barr, Region V (509) 377-2627 Kamal Naidu, NRR (301) 504-2980 Attachments:

1. Survey of Licensee Event Reports (LERs)2. List of Recently Issued NRC Information

Notices Document Name: PRESBOUN.IN

  • SEE PREVIOUS CONCURRENCES

OGCB:DORS:NRR

CVHodge V@06/o3/92 01 /Iq/3 D/DORS:NRR

BKGrimes 01/ /93 RESINSP/RV

RBarr w C/OGCB:DORS:NRR*RPB:ADM

GHMarcus TechEd 01/ /93 04/13/92*RVIB:DRIL:NRR

SC/RVIB:DRIL:NRR

KNaidu GCwalina 01/11/93 01/ /93 D/DRIL:NRR

CERossi 01/ /93 C/RVIB:DRIL:NRR

LJNorrholm

01/ /93 of EPA seals represent

violations

of Containment

integrity

and environmental

qualification

deficiencies

in EPA components

indicatepe

s m -/~u4n-deiiP

coddia")loss~bf(oolant

accident (LOCA) co'nditions.

A brief survey of these LERs I4B'Cincluded

in .ttachmet

A im This information

notice requires you have any questions

about the of the technical

contacts listed Reactor Regulation (NRR) project no specific action or written response.

If information

in this notice, please contact one below or the appropriate

Office of Nuclear manager.Charles E. Rossi, Director Division of Operational

Events Assessment

Office of Nuclear Reactor Regulation

Technical

contacts: Vern Hodge, NRR (301) 504-1861 Rob Barr, RV (503) 556-3751 Attachments:

1. Survey of Licensee Event Reports (LERs)2. List of Recently Issued NRC Information

Notices Document Name: BUNK0403 REV 19 OGCB:DOEA:NRR

CVHodge 04/ /92 RESINSP/RV

RBarr 04/ /92 D/DOEA:NRR

CERossi 04/ /92 RVIB:DRIS:NRR

KNaidu 04/ /92 C/OGCB:DOEA:NRR

CHBerlinger

04/ /92 RPB:ADM TechEd J'Ma;, )04/13 /92 ROAB:DSP:NRR

SMazumdar 04/ /92


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