TABLE OF CONTENTS This appendix contains two NRC documents on the subject of oil loss in nuclear power plant pressure transmitters. These documents are:
| (1990)- | NRC Bulletin No. 90-01: Loss of Fill-Oil in Transmitters Manufactured By Rosemount |
| (2004)- | NRC ISSUE 176 Document: Loss Of Fill-Oil in Rosemount Transmitters |
The first document above (Bulletin No. 90-01) describes the nature of the oil loss problem and its potential consequences, and the second document (Issue 176) is provided by the NRC to close the oil loss issue for the nuclear power industry.
OMB No.: 3150-0011
NRCB 90-01
United States
Nuclear Regulatory Commission
Office of Nuclear Reactor Regulation
Washington, D.C. 20555
March 9, 1990
NRC Bulletin No. 90-01:
Loss of Fill-Oil in Transmitters
Manufactured by Rosemount
Addressees:
All holders of operating licenses or construction permits for nuclear power reactors.
Purpose:
This bulletin requests that addressees promptly identify and take appropriate corrective actions for Model 1153 Series B, Model 1153 Series D, and Model 1154 transmitters manufactured by Rosemount that may be leaking fill-oil.
Description of Circumstances:
NRC Information Notice No. 89-42, "Failure of Rosemount Models 1153 and 1154 Transmitters," dated April 21,1989, was issued to alert industry to a series of reported failures of Rosemount Models 1153 and 1154 pressure and differential pressure transmitters. The reported failures occurred at Northeast Utilities' Millstone Unit 3 between March and October 1987. Subsequent investigation into the cause of the failures by Rosemount confirmed that the failure mode was a gradual loss of fill-oil from the transmitter's sealed sensing module.
