Information Notice 1992-27, Thermally Induced Accelerated Aging and Failure of Ite/Gould A.C. Relays Used in Safety-Related Applications: Difference between revisions

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{{#Wiki_filter:P.                       .  I3 UNITED STATES
{{#Wiki_filter:P.


.
I3
===UNITED STATES===
NUCLEAR REGULATORY COMMISSION
NUCLEAR REGULATORY COMMISSION


OFFICE OF NUCLEAR REACTOR REGULATION
===OFFICE OF NUCLEAR REACTOR REGULATION===
WASHINGTON, D.C.
 
20555


WASHINGTON, D.C. 20555 April 3, 1992 NRC INFORMATION NOTICE 92-27:   THERMALLY INDUCED ACCELERATED AGING AND
===April 3, 1992===
NRC INFORMATION NOTICE 92-27: THERMALLY INDUCED ACCELERATED AGING AND


FAILURE OF ITE/GOULD A.C. RELAYS USED
FAILURE OF ITE/GOULD A.C. RELAYS USED
Line 38: Line 47:
failure of 120Y ac relays manufactured by the ITE/Gould Manufacturing Company
failure of 120Y ac relays manufactured by the ITE/Gould Manufacturing Company


(currently Telemecanique). The relay failures rendered portions of the associ- ated safety-related systems inoperable. It is expected that recipients will
(currently Telemecanique).
 
The relay failures rendered portions of the associ- ated safety-related systems inoperable. It is expected that recipients will


review the information for applicability to their facilities and consider
review the information for applicability to their facilities and consider
Line 53: Line 64:
features operability test, the licensee for the Millstone Nuclear Power
features operability test, the licensee for the Millstone Nuclear Power


Station, Unit 3, noted that control power was interrupted to three safety- related motor operated valves (MOYs). The valves were located in the charging, component cooling water, and steam generator atmospheric dump systems. The
Station, Unit 3, noted that control power was interrupted to three safety- related motor operated valves (MOYs). The valves were located in the charging, component cooling water, and steam generator atmospheric dump systems.
 
The


licensee inspected the valves' control power circuitry and determined that
licensee inspected the valves' control power circuitry and determined that


three normally energized auxiliary relays had failed. These relays provided
three normally energized auxiliary relays had failed.


===These relays provided===
control power alarms and thermal overload protection for the MOYs. The relay
control power alarms and thermal overload protection for the MOYs. The relay


Line 66: Line 80:
relays with J20M magnet block assemblies and standard G1OJA126, 120V, 60 cycle
relays with J20M magnet block assemblies and standard G1OJA126, 120V, 60 cycle


coil assemblies manufactured by the ITE/Gould Manufacturing Company. Inspection
coil assemblies manufactured by the ITE/Gould Manufacturing Company.
 
Inspection


of the relays revealed that the movable plastic armature carrier, which surrounds
of the relays revealed that the movable plastic armature carrier, which surrounds


the core and coil, and the retainer for the magnet yoke assembly were discolored, brittle and severely cracked. Insulation degradation was severe, allowing
the core and coil, and the retainer for the magnet yoke assembly were discolored, brittle and severely cracked.


===Insulation degradation was severe, allowing===
electrical shorts to develop within the coils. The licensee concluded that the
electrical shorts to develop within the coils. The licensee concluded that the


Line 87: Line 104:
cluster. The relays were originally qualified, individually, for the life of
cluster. The relays were originally qualified, individually, for the life of


the plant. However, the qualification process did not account for the use of
the plant.
 
However, the qualification process did not account for the use of


the relays in the ganged arrangement. The licensee stated that the potential
the relays in the ganged arrangement. The licensee stated that the potential
Line 151: Line 170:
of the failure of any of the other J-class relays, these relays could be suscep- tible to similar heat induced degradation when gang mounted.
of the failure of any of the other J-class relays, these relays could be suscep- tible to similar heat induced degradation when gang mounted.


IN 92-27 April 3, 1992 This information notice requires no specific action or written response. If
IN 92-27 April 3, 1992 This information notice requires no specific action or written response.
 
If


you have any questions about the information in this notice, please contact
you have any questions about the information in this notice, please contact
Line 159: Line 180:
Reactor Regulation (NRR) project manager.
Reactor Regulation (NRR) project manager.


Charles E. Rossi, Director
===Charles E. Rossi, Director===
 
Division of Operational Events Assessment
Division of Operational Events Assessment


Office of Nuclear Reactor Regulation
===Office of Nuclear Reactor Regulation===
Technical contacts: N. Fields, NRR


Technical contacts:  N. Fields, NRR
(301) 504-1173
 
(301) 504-1173 K. Naidu, NRR


===K. Naidu, NRR===
(301) 504-2980
(301) 504-2980
                      R. Spence, AEOD


===R. Spence, AEOD===
(301) 492-8609 Attachment: List of Recently Issued NRC Information Notices
(301) 492-8609 Attachment: List of Recently Issued NRC Information Notices


2 IC
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Attachment
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IN 92-27


IN 92-27 April 3, 1992 CI in W
===April 3, 1992 LIST OF RECENTLY ISSUED===
NRC INFORMATION NOTICES


I *0      a
Information


LIST OF RECENTLY ISSUED
Date of


11                                            NRC INFORMATION NOTICES
Notice No.


Information                                    Date of
Subject


Notice No.          Subject                    Issuance Issued to
Issuance


5 Cl
Issued to


92-26         Pressure Locking of Motor- Operated Flexible Wedge
92-26 Pressure Locking of Motor-  
04/02/92


04/02/92 All holders of OLs or CPs
===All holders of OLs or CPs===
Operated Flexible Wedge


for nuclear power reactors.
for nuclear power reactors.


(
Gate Valves
          2                      Gate Valves
 
92-25 Potential Weakness in


92-25          Potential Weakness in          03/31/92 All holders of OLs or CPs
03/31/92  


Licensee Procedures for A               for nuclear power reactors.
===All holders of OLs or CPs===
Licensee Procedures for A


Loss of the Refueling
for nuclear power reactors.


===Loss of the Refueling===
Cavity Water
Cavity Water


92-24         Distributor Modification to     03/30/92 All holders of OLs or CPs
92-24 Distributor Modification to
 
03/30/92  
 
===All holders of OLs or CPs===
Certain Coemercial-Grade
 
for nuclear power reactors.
 
===Agastat Electrical Relays===
92-23 Results of Validation Test-
03/27/92
 
===All holders of OLs or CPs===
ing of Motor-Operated Valve
 
for nuclear power reactors
 
Diagnostic Equipment
 
and all vendors of motor- operated valve (MOV) diag- nostic equipment.
 
92-22 Criminal Prosecution and


Certain Coemercial-Grade                for nuclear power reactors.
03/24/92


Agastat Electrical Relays
===All holders of OLs or CPs===
Conviction of Wrongdoing


92-23          Results of Validation Test-    03/27/92 All holders of OLs or CPs
for nuclear power reactors.


ing of Motor-Operated Valve              for nuclear power reactors
Committed by A Coeuercial-


Diagnostic Equipment                    and all vendors of motor- operated valve (MOV) diag- nostic equipment.
===Grade Valve Supplier===
92-21 Spent Fuel Pool Reactivity


92-22          Criminal Prosecution and        03/24/92 All holders of OLs or CPs
03/24/92  
 
===All holders of OLs or CPs===
Calculations
 
for nuclear power reactors.


Conviction of Wrongdoing                for nuclear power reactors.
92-20
Inadequate Local Leak Rate


Committed by A Coeuercial- Grade Valve Supplier
03/03/92


92-21          Spent Fuel Pool Reactivity      03/24/92 All holders of OLs or CPs
===All holders of OLs or CPs===
Testing


Calculations                            for nuclear power reactors.
for nuclear power reactors.


92-20          Inadequate Local Leak Rate      03/03/92 All holders of OLs or CPs
92-19 Misapplication of Potter 5
03/02/92  


Testing                                  for nuclear power reactors.
===All holders of OLs or CPs===
Brumfield MDR Rotary Relays


92-19          Misapplication of Potter 5      03/02/92 All holders of OLs or CPs
for nuclear power reactors.


Brumfield MDRRotary Relays              for nuclear power reactors.
92-18 Potential for Loss of Re-
02/28/92


92-18          Potential for Loss of Re-      02/28/92 All holders of OLs or CPs
===All holders of OLs or CPs===
mote Shutdown Capability


mote Shutdown Capability                for nuclear power reactors.
for nuclear power reactors.


during A Control Room Fire
during A Control Room Fire


OL - Operating License
CP - Construction Permit
(
. X
. X


OL - Operating License
X
 
I>
a


X        I> CP - Construction Permit
a


0a  a I;5
0
I5
;


IN 92-27 April 3, 1992 This information notice requires no specific action or written response. If
IN 92-27 April 3, 1992 This information notice requires no specific action or written response. If
Line 267: Line 347:
Reactor Regulation (NRR) project manager.
Reactor Regulation (NRR) project manager.


Charles E. Rossi, Director
===Charles E. Rossi, Director===
 
Division of Operational Events Assessment
Division of Operational Events Assessment


Office of Nuclear Reactor Regulation
===Office of Nuclear Reactor Regulation===
Technical contacts:


Technical contacts:        N. Fields, NRR
===N. Fields, NRR===
 
(301) 504-1173
(301) 504-1173 K. Naidu, NRR


===K. Naidu, NRR===
(301) 504-2980
(301) 504-2980
                                          R. Spence, AEOD


(301) 492-8609 Attachment:       List of Recently Issued NRC Information Notices
===R. Spence, AEOD===
(301) 492-8609 Attachment:


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


OFC   :DOEA:OEAB         :AEOD:ROAB       :DRIS:RVIB   :ADM:RPB     :RI                       :SC:DOEA:OEAB:
OFC
NAME :NFields*         :RSpence*         :KNaidu*     :JMain*       :RBarkley*                 :DFischer*   :
 
DATE :03/04/92         :03/04/92         :03/09/92     :01/23/92     :03/05/92                 :03/11/92 OFC   :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA                 :             :                         :
:DOEA:OEAB
_____ _______
 
      ___----------:-     -------
:AEOD:ROAB
                            A                          :------------ :------------:------------               :---------
 
NAME :AChaffee*         :CBerlinger* :                   :
:DRIS:RVIB
DATE :03/11/92         :03/18/92         :03/2;792     :             :                         :
 
                OFFICIAL RECORD COPY
:ADM:RPB
 
:RI
 
:SC:DOEA:OEAB:
NAME :NFields*  
:RSpence*  
:KNaidu*  
:JMain*  
:RBarkley*  
:DFischer*  
:
DATE :03/04/92  
:03/04/92  
:03/09/92  
:01/23/92  
:03/05/92  
:03/11/92 OFC :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA
 
:  
:  
:
_____ _______  
___----------:-  
A
 
-------
:------------  
:------------:------------  
:---------
NAME :AChaffee*  
:CBerlinger* :  
:
DATE :03/11/92  
:03/18/92  
:03/2;792  
:  
:  
:
 
===OFFICIAL RECORD COPY===
Document Name:


Document Name: IN DRAFT MILLSTONE
===IN DRAFT MILLSTONE===


IN 92-XX
IN 92-XX
Line 306: Line 428:
Reactor Regulation (NRR) project manager.
Reactor Regulation (NRR) project manager.


Charles E. Rossi, Director
===Charles E. Rossi, Director===
 
Division of Operational Events Assessment
Division of Operational Events Assessment


Office of Nuclear Reactor Regulation
===Office of Nuclear Reactor Regulation===
 
Technical contacts: N. Fields, NRR
Technical contacts:       N. Fields, NRR


(301) 504-1173 K. Naidu, NRR
(301) 504-1173


===K. Naidu, NRR===
(301) 504-2980
(301) 504-2980
                                    R. Spence, AEOD


(301) 492-8609 Attachment:       List of Recently Issued NRC Information Notices
===R. Spence, AEOD===
(301) 492-8609 Attachment: List of Recently Issued NRC Information Notices


*SEE PREVIOUS CONCURRENCE
*SEE PREVIOUS CONCURRENCE


OFC :DOEA:OEAB     :AEOD:ROAB     :DRIS:RVIB                   :ADM:RPB     :RI         :SC:DOEA:OEAB:
OFC
NAME :NFields*     :RSpence*       :KNaidu*                     :JMain*     :RBarkley*   :DFischer*           :
 
DATE :03/04/92     :03/04/92       :03/09/92                     :01/23/92   :03/05/92   :03/11/92 OFC :C:DOEA:OEAB :C:D0E 9yt         D:DOEA                                    :            :
:DOEA:OEAB
      ________---------:----1---    ----------------------------                            ------------        ---------
 
NAME :AChaffee*    :CBer          :CRossi
:AEOD:ROAB
 
:DRIS:RVIB
 
:ADM:RPB
 
:RI
 
:SC:DOEA:OEAB:
NAME :NFields*  
:RSpence*  
:KNaidu*  
:JMain*  
:RBarkley*  
:DFischer*  
:
DATE :03/04/92  
:03/04/92  
:03/09/92  
:01/23/92  
:03/05/92  
:03/11/92 OFC :C:DOEA:OEAB :C:D0E 9yt


DATE :03/11/92      ./        9    : /          /92            :
D:DOEA
          OFFICIAL RECORD COPY


Document Name: IN DRAFT MILLSTONE
:
:
________---------:----1---
----------------------------
------------
---------
NAME :AChaffee*
:CBer
 
:CRossi
 
DATE :03/11/92
./
9
: /
/92
:
 
===OFFICIAL RECORD COPY===
Document Name:  
 
===IN DRAFT MILLSTONE===


*SEE PREVIOUS CONCURRENCE
*SEE PREVIOUS CONCURRENCE


OFC   :DOEA:OEAB   :AEOD:ROAB     :DRIS:RVIB    :ADM:RPB      :RI          :S  OEA:OEAB:
OFC
NAME :NFields*    :RSpence*      :KNaidu*      :JMain*        :RBarkley*    :DF scner    :
 
DATE :03/04/92    :03/04/92      :03/09/92      :01/23/92      :03/05/92    :3/gi/92 OFC  :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA
:DOEA:OEAB
 
:AEOD:ROAB


-----      : <F;    ------------ :------------:------------:-- ---------:--- ------------  ___
:DRIS:RVIB
NAME :AC~affee    :CBerlinger    :CRossi        :              :            :
DATE :3 /11/92    : /    /92    : /    /92    :              :            :
          OFFICIAL RECORD COPY


:ADM:RPB
:RI
:S
OEA:OEAB:
NAME :NFields*
:RSpence*
:KNaidu*
:JMain*
:RBarkley*
:DF scner
:
DATE :03/04/92
:03/04/92
:03/09/92
:01/23/92
:03/05/92
: 3/gi/92 OFC :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA
-----
: <F;
------------ :------------:------------:-- ---------:--- ------------
___
NAME :AC~affee
:CBerlinger :CRossi
:
:
:
DATE :3 /11/92
: /
/92
: /
/92
:
:
:
===OFFICIAL RECORD COPY===
Document Name: IN DRAFT MILLSTONE
Document Name: IN DRAFT MILLSTONE


*SEE PREVIOUS CONCURRENCE
*SEE PREVIOUS CONCURRENCE


OFC :DOEA:OEAB   :AEOD:ROAB   :DRIS:RVIB   :ADM:RPB :RI       :SC:DOEA:OEAB:
OFC
NAME :NFields*    :RSpence*    :            :JMain*  :RBarkley* :DFischer
 
:DOEA:OEAB
 
:AEOD:ROAB
 
:DRIS:RVIB
 
:ADM:RPB
 
:RI


DATE :03/04/92    :03/04/92    :5    /92    :01/23/92 :03/05/92  : /  /92 OFC  :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA
:SC:DOEA:OEAB:
NAME :NFields*
:RSpence*
:  
:JMain*
:RBarkley*
:DFischer


NAME :AChaffee    :CBerlinger  :CRoss:                :          :
DATE :03/04/92
DATE:   / /92   : / /92     : /   /92   :         :         :
:03/04/92
          OFFICIAL RECORD COPY
:5
/92
:01/23/92  
:03/05/92  
: /  
/92 OFC :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA


Document Name: IN DRAFT MILLSTONE
NAME :AChaffee
 
:CBerlinger :CRoss:
:
:
DATE: /
/92
: / /92
: /
/92
:
:
:
 
===OFFICIAL RECORD COPY===
Document Name:  
 
===IN DRAFT MILLSTONE===


*SEE PREVIOUS CONCURRENCE
*SEE PREVIOUS CONCURRENCE


OFC :DOEA:OEAB     :AEOD:ROAB       :DRIS:RYIB :ADM:RPB :RI          :SC:DOEA:OEAB:
OFC :DOEA:OEAB
NAME :NFields*      :RSpence*        :KNaidu    :JMain*  :RBark1e!    :DFischer        :
 
                                --------                      - 4---- -------
:AEOD:ROAB
DATE :03/04/92      :03/04/92        : /  /92  :01/23/92 :3/v/92      : / /92 OFC  :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA
 
:DRIS:RYIB
 
:ADM:RPB


___-
:RI
      __ _________  __                                                  ------------
NAME :AChaffee      :CBerlinger      :CRossi    :
DATE ://92          :/    /92        :/    /92            :                            :
            OFFICIAL RECORD COPY


:SC:DOEA:OEAB:
NAME :NFields*
:RSpence*
:KNaidu
:JMain*
:RBark1e!
:DFischer
:
--------
- 4----
-------
DATE :03/04/92
:03/04/92
: /
/92
:01/23/92
:3/v/92
: / /92 OFC :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA
___- __
_________
__
------------
NAME :AChaffee
:CBerlinger :CRossi
:
DATE ://92
:/
/92
:/
/92
:
:
===OFFICIAL RECORD COPY===
Document Name: IN DRAFT MILLSTONE
Document Name: IN DRAFT MILLSTONE


tgm;7it   iy2LIu
tgm;7it
 
iy2LIu
 
OFC :DOEA:OEAB
 
:AEOD:ROAB
 
:DRIS:RVIB
 
:AMM:RPB"
:RI
 
:SC:DOEA:OEAB:
NAME :NFields or :RSpence
 
:KNaidu
 
:JMain
 
:RBarkley
 
:DFischer
 
:
DATE : 3 /T[/92
:3 / / 92
: / /92
: /2-4/92
: / /92
: / /92
:
OFC :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA


OFC    :DOEA:OEAB            :AEOD:ROAB  :DRIS:RVIB :AMM:RPB"        :RI      :SC:DOEA:OEAB:
___-
NAME :NFields        or      :RSpence    :KNaidu    :JMain            :RBarkley :DFischer    :
:  
DATE :3 /T[/92                :3 /  / 92  : / /92    :  /2-4/92        : / /92  : / /92      :
---
OFC    :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA
---
---
_
_______
_
_
------------
NAME :AChaffee


___- _ : _______
:CBerllnger :CRossi
          ---    --- _ --- _                                                    ------------
NAME :AChaffee                :CBerllnger :CRossi


DATE ://92                   :/   /92   :/   /92 :
DATE ://92  
                OFFICIAL RECORD COPY
:/  
/92  
:/  
/92  
:


Document Name: IN DRAFT MILLSTONE}}
===OFFICIAL RECORD COPY===
Document Name:  
IN DRAFT MILLSTONE}}


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

Latest revision as of 10:14, 16 January 2025

Thermally Induced Accelerated Aging and Failure of Ite/Gould A.C. Relays Used in Safety-Related Applications
ML031200594
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  Entergy icon.png
Issue date: 04/03/1992
From: Rossi C
Office of Nuclear Reactor Regulation
To:
References
IN-92-027, NUDOCS 9203270157
Download: ML031200594 (10)
v • d • e


P.

.

I3

UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C.

20555

April 3, 1992

NRC INFORMATION NOTICE 92-27: THERMALLY INDUCED ACCELERATED AGING AND

FAILURE OF ITE/GOULD A.C. RELAYS USED

IN SAFETY-RELATED APPLICATIONS

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 resulting from the accelerated aging and

failure of 120Y ac relays manufactured by the ITE/Gould Manufacturing Company

(currently Telemecanique).

The relay failures rendered portions of the associ- ated safety-related systems inoperable. 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

On November 23, 1991, while performing an eighteen month engineered safety

features operability test, the licensee for the Millstone Nuclear Power

Station, Unit 3, noted that control power was interrupted to three safety- related motor operated valves (MOYs). The valves were located in the charging, component cooling water, and steam generator atmospheric dump systems.

The

licensee inspected the valves' control power circuitry and determined that

three normally energized auxiliary relays had failed.

These relays provided

control power alarms and thermal overload protection for the MOYs. The relay

failures rendered each valve inoperable.

The relays, which had been in service for about seven years, were class J10

relays with J20M magnet block assemblies and standard G1OJA126, 120V, 60 cycle

coil assemblies manufactured by the ITE/Gould Manufacturing Company.

Inspection

of the relays revealed that the movable plastic armature carrier, which surrounds

the core and coil, and the retainer for the magnet yoke assembly were discolored, brittle and severely cracked.

Insulation degradation was severe, allowing

electrical shorts to develop within the coils. The licensee concluded that the

failures resulted from the thermal aging of the coil assemblies and plastic

parts near the coil assemblies.

9203270157 ;Z4-

IN 92-27 April 3, 1992 The failed relays were mounted shoulder to shoulder in a horizontal "ganged"

arrangement on a universal mounting strip supplied by the manufacturer. The

three relays that failed were each mounted in the middle of a ganged relay

cluster. The relays were originally qualified, individually, for the life of

the plant.

However, the qualification process did not account for the use of

the relays in the ganged arrangement. The licensee stated that the potential

heat induced degradation of "weak-link" materials such as the plastic armature

carrier was not considered in the qualification test report.

The licensee inspected relays in other safety and nonsafety systems and found

similar discoloration and embrittlement caused by overheating, but found no

additional failures. The Millstone licensee has replaced approximately 260

relays with identical components from spare motor control centers. Long term

corrective actions include periodic monitoring and replacement and/or physical

separation of ganged relays.

During the period April 1987 through August 1987, the licensee for the Seabrook

Generating Station experienced similar failures of ITE/Gould J-10 relays.

Following those failures, Telemecanique submitted a report to the NRC under

Title 10 of the Code of Federal Regulations (10 CFR), Part 21 (Part 21 report)

describing the Uailures at Seabrook. The report attributed the overheating

failures to the special low voltage coils in the J10 relays that were supplied

to the Seabrook Nuclear Station. Telemecanique stated that the relays supplied

to Seabrook were equipped with a non-standard magnet coil (identified as 816 with 50 ohms resistance) and, therefore, the failure mode would not be experi- enced at any other facility. The licensee for the Seabrook Station submitted a

Licensee Event Report (LER) to the NRC under 10 CFR Part 50.73 describing the

relay failures and their root cause analysis. The licensee stated in the LER

that, "...It was originally believed that excessive temperature resulted from

the close proximity of six normally energized relays...Subsequent investigation

led to the identification of relays not in close proximity with other energized

components that showed slight discoloration." However, the Seabrook licensee

accepted the Telemecanique Part 21 report conclusions that the failures were

due to the heat generated by the energized, non-standard coil.

The recent failures at Millstone suggest that the Seabrook licensee's original

conclusion may have been accurate. The gang mounting ("close proximity") of

these relays was likely a major contributor to the accelerated aging with

the condition being exacerbated by the additional heat generated by the contin- uously energized coil.

The J10 relay is one of a family of J-class relays currently manufactured by

Telemecanique as commercial grade items. Although the NRC staff is not aware

of the failure of any of the other J-class relays, these relays could be suscep- tible to similar heat induced degradation when gang mounted.

IN 92-27 April 3, 1992 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.

Charles E. Rossi, Director

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Technical contacts: N. Fields, NRR

(301) 504-1173

K. Naidu, NRR

(301) 504-2980

R. Spence, AEOD

(301) 492-8609 Attachment: List of Recently Issued NRC Information Notices

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IN 92-27

April 3, 1992 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information

Date of

Notice No.

Subject

Issuance

Issued to

92-26 Pressure Locking of Motor-

04/02/92

All holders of OLs or CPs

Operated Flexible Wedge

for nuclear power reactors.

Gate Valves

92-25 Potential Weakness in

03/31/92

All holders of OLs or CPs

Licensee Procedures for A

for nuclear power reactors.

Loss of the Refueling

Cavity Water

92-24 Distributor Modification to

03/30/92

All holders of OLs or CPs

Certain Coemercial-Grade

for nuclear power reactors.

Agastat Electrical Relays

92-23 Results of Validation Test-

03/27/92

All holders of OLs or CPs

ing of Motor-Operated Valve

for nuclear power reactors

Diagnostic Equipment

and all vendors of motor- operated valve (MOV) diag- nostic equipment.

92-22 Criminal Prosecution and

03/24/92

All holders of OLs or CPs

Conviction of Wrongdoing

for nuclear power reactors.

Committed by A Coeuercial-

Grade Valve Supplier

92-21 Spent Fuel Pool Reactivity

03/24/92

All holders of OLs or CPs

Calculations

for nuclear power reactors.

92-20

Inadequate Local Leak Rate

03/03/92

All holders of OLs or CPs

Testing

for nuclear power reactors.

92-19 Misapplication of Potter 5

03/02/92

All holders of OLs or CPs

Brumfield MDR Rotary Relays

for nuclear power reactors.

92-18 Potential for Loss of Re-

02/28/92

All holders of OLs or CPs

mote Shutdown Capability

for nuclear power reactors.

during A Control Room Fire

OL - Operating License

CP - Construction Permit

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IN 92-27 April 3, 1992 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.

Charles E. Rossi, Director

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Technical contacts:

N. Fields, NRR

(301) 504-1173

K. Naidu, NRR

(301) 504-2980

R. Spence, AEOD

(301) 492-8609 Attachment:

List of Recently Issued NRC Information Notices

  • SEE PREVIOUS CONCURRENCE

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DATE :03/04/92

03/04/92
03/09/92
01/23/92
03/05/92
03/11/92 OFC :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA

_____ _______

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NAME :AChaffee*

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DATE :03/11/92

03/18/92
03/2;792

OFFICIAL RECORD COPY

Document Name:

IN DRAFT MILLSTONE

IN 92-XX

March xx, 1992 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.

Charles E. Rossi, Director

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Technical contacts: N. Fields, NRR

(301) 504-1173

K. Naidu, NRR

(301) 504-2980

R. Spence, AEOD

(301) 492-8609 Attachment: List of Recently Issued NRC Information Notices

  • SEE PREVIOUS CONCURRENCE

OFC

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DATE :03/04/92

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03/09/92
01/23/92
03/05/92
03/11/92 OFC :C:DOEA:OEAB :C:D0E 9yt

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NAME :AChaffee*

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DATE :03/11/92

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OFFICIAL RECORD COPY

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3/gi/92 OFC :C:DOEA:OEAB :C:DOEA:OGCB :D:DOEA
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DATE :3 /11/92

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OFFICIAL RECORD COPY

Document Name: IN DRAFT MILLSTONE

  • SEE PREVIOUS CONCURRENCE

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DRIS:RVIB
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DATE :03/04/92

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DATE: /

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OFFICIAL RECORD COPY

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DATE :03/04/92

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IN DRAFT MILLSTONE


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