Category:NRC Information Notice[Table view]The following query condition could not be considered due to this wiki's restrictions on query size or depth: <code> [[:Beaver Valley]] OR [[:Millstone]] OR [[:Hatch]] OR [[:Monticello]] OR [[:Calvert Cliffs]] OR [[:Dresden]] OR [[:Davis Besse]] OR [[:Peach Bottom]] OR [[:Browns Ferry]] OR [[:Salem]] OR [[:Oconee]] OR [[:Mcguire]] OR [[:Nine Mile Point]] OR [[:Palisades]] OR [[:Palo Verde]] OR [[:Perry]] OR [[:Indian Point]] OR [[:Fermi]] OR [[:Kewaunee]] OR [[:Catawba]] OR [[:Harris]] OR [[:Wolf Creek]] OR [[:Saint Lucie]] OR [[:Point Beach]] OR [[:Oyster Creek]] OR [[:Watts Bar]] OR [[:Hope Creek]] OR [[:Grand Gulf]] OR [[:Cooper]] OR [[:Sequoyah]] OR [[:Byron]] OR [[:Pilgrim]] OR [[:Arkansas Nuclear]] OR [[:Braidwood]] OR [[:Susquehanna]] OR [[:Summer]] OR [[:Prairie Island]] OR [[:Columbia]] OR [[:Seabrook]] OR [[:Brunswick]] OR [[:Surry]] OR [[:Limerick]] OR [[:North Anna]] OR [[:Turkey Point]] OR [[:River Bend]] OR [[:Vermont Yankee]] OR [[:Crystal River]] OR [[:Haddam Neck]] OR [[:Ginna]] OR [[:Diablo Canyon]] OR [[:Callaway]] OR [[:Vogtle]] OR [[:Waterford]] OR [[:Duane Arnold]] OR [[:Farley]] OR [[:Robinson]] OR [[:Clinton]] OR [[:South Texas]] OR [[:San Onofre]] OR [[:Cook]] OR [[:Comanche Peak]] OR [[:Yankee Rowe]] OR [[:Maine Yankee]] OR [[:Quad Cities]] OR [[:Humboldt Bay]] OR [[:La Crosse]] OR [[:Big Rock Point]] OR [[:Rancho Seco]] OR [[:Zion]] OR [[:Midland]] OR [[:Bellefonte]] OR [[:Fort Calhoun]] OR [[:FitzPatrick]] OR [[:McGuire]] OR [[:LaSalle]] OR [[:05000000]] OR [[:Zimmer]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] OR [[:Crane]] </code>.
All holders of operating licenses or construction permits for nuclear power
reactors.
Purpose
This information notice is being provided to alert addressees to a potentially
generic safety problem involving CIR series electrical connectors manufactured
by the Yeam Division of Litton Industries. These connectors have been supplied
to numerous commercial nuclear plants by Combustion Engineering, Inc. (CE), and
have been obtained by at least three plants through other channels.
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 do not
constitute NRC requirements; therefore, no specific action or written response
is required.
Description of Circumstances
Litton-Veam CIR series multi-pin electrical connectors are used in core exit
thermocouple (CET) and reactor vessel level monitoring (RVLM) systems supplied
to numerous plants by Combustion Engineering, Inc., and are used in other ap- plications in at least three additional plants. A proprietary qualification
test report (CE NPSD-230-P) has been used to document environmental qualifi- cation of the connectors for loss of coolant accident (LOCA) conditions in the
CE-supplied systems.
During LOCA testing, the connector face seal gasket was
completely degraded and elastomeric inserts interacted with simulated contain- ment spray solution which leaked into the connector.
Insulation resistances
near 1,000 ohms were measured.
CE has performed analyses to show that resultant
errors are acceptable in CE-supplied CET and RYLM system thermocouple circuits.
However, the moisture ingress and resultant low insulation resistances are not
advised that one of these remedies has been used for all of the RYLM heater
circuits. Unmodified CIR connectors are believed to be still in use in other
applications.
I1\\~
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I-
IN 89-23 March 3, 1989 Details of this concern, including a list of plants believed to be affected, are contained in NRC Inspection Report 99900401/88-01, dated January 10, 1989.
Discussion:
CE LOCA-tested the Litton-Yeam connectors only in thermocouple circuits, which
tolerate relatively poor electrical characteristics. In other applications
such as transmitter and solenoid valve circuits, licensees are cautioned that
CE's testing (1) does not establish qualification and (2) strongly suggests
qualification problems.
Connector failures could result in the loss of the
functions of connected qualified equipment.
No specific action or written response is required by this information notice.
If you have any questions about this matter, please contact the technical
contact listed below or the Regional Administrator of the appropriate regional
IN 89-23 March 3, 1989 Details of this concern, including a list of plants believed to be affected, are contained in NRC Inspection Report 99900401/88-01, dated January 10, 1989.
Discussion:
CE LOCA-tested the Litton-Veam connectors only in thermocouple circuits, which
tolerate relatively poor electrical characteristics. In other applications
such as transmitter and solenoid valve circuits, licensees are cautioned that
CE's testing (1) does not establish qualification and (2) strongly suggests
qualification problems. Connector failures could result in the loss of the
functions of connected qualified equipment.
No specific action or written response is required by this information notice.
If you have any questions about this matter, please contact the technical
contact listed below or the Regional Administrator of the appropriate regional
office.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact:
Richard C. Wilson, NRR
(301) 492-0997 Attachment:
List of Recently Issued NRC Information Notices
SEE PREVIOUS CONCURRENCE PAGE
VIB:DRIS*
RCWilson:jh
02/17/89 BC:GCB*
CBerlinger
02/27/89 SC:VIB:DRIS*
TECH EDITOR*
UPotapovs
02/21/89
02/17/89 O2/j4/89 EWBrach
BKGrimes
02/21/89
02/22/89 BC:SPLB:DES*
JCraig
02/23/89
IN 89-XX
February XX, 1989 Discussion:
CE LOCA-tested the Litton-Yeam connectors only in thermocouple circuits, which
eircuits, licensees may-wish to consider changing te conncetorz that dt
t
nt
uffer damage and1 moisture ingress during LOCA conditineg.
In other appli- cations such as transmitter and solenoid valve circuits, licensees are cau- tioned that CE's testing (1) does not establish qualification and (2) strongly
suggests qualification problems.
Connector failures could result in the loss
of the functions of connected qualified equipment.
No specific action or written response is required by this information notice.
If you have any questions about this mlatter, please contact the technical
contact listed below or the Regional Administrator of the appropriate regional