Closeout of IE Bulletin 79-28: Possible malfunction of NAMCO Model EA180 limit switches at elevated temperatures

Technical Report · Tue Aug 01 04:00:00 EDT 1989

OSTI ID:5685213

Foley, W J; Dean, R S; Hennick, A

Documentation is provided in this report for the closeout of IE Bulletin 79-28 regarding the possible malfunction of NAMCO Model EA180 limit switched in safety-related systems at elevated temperatures. Closeout is based on the implementation and verification of four (4) required actions by holders of operating licenses or construction permits for nuclear power facilities. Evaluation of utility responses and NRC/Region inspection reports indicated that the bulletin is closed for all of the 119 facilities to which it was issued for action. It is concluded from the results that although the potential problem was widespread, supporting documentation shows that the bulletin concern has been resolved.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (USA). Div. of Operational Events Assessment; Parameter, Inc., Elm Grove, WI (USA)
• OSTI ID: 5685213
• Report Number(s): NUREG/CR-5290; PARAMETER/IE-181; ON: TI89016026
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220400* -- Nuclear Reactor Technology-- Control Systems
BWR TYPE REACTORS
COOPER REACTOR
ELECTRICAL EQUIPMENT
EQUIPMENT
FAILURES
INSPECTION
NATIONAL ORGANIZATIONS
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
POWER PLANTS
POWER REACTORS
REACTORS
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THERMAL POWER PLANTS
US NRC
US ORGANIZATIONS
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WATER MODERATED REACTORS