ML20138A752
| ML20138A752 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point, River Bend, 05000000 |
| Issue date: | 10/08/1985 |
| From: | Baer R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Denham F LIMITORQUE CORP. |
| References | |
| NUDOCS 8510090492 | |
| Download: ML20138A752 (1) | |
Text
,
OCT 8195 7*
Mr. Frank Denham Executive Vice President Limitorque Corporation 5114 Woodal Road P.O. Box 11318 Lynchburg, Virginia 24506
Dear Mr. Denham,
Subject:
Environmental Qualification Failure of Reliance Class RH AC Motors as used with Limitorque SB-3-150(AC) Motor Actuators General Electric has rccently informed the NRC that they have experienced test anomalies of the Reliance Class RH AC motors during the environmental qualifi-cation testing at Wyle Labs of the Limitorque fast acting SB-3-150 valve motor operator for their River Bend (CSU) and Nine Mile Point 2 (Niagara Mohawk) customers. The test anomalies, in particular what appears to be a failure of the magnesium rotors to withstand the test LOCA profile, have raised concern with the long term availability of valve operator motors with magnesium rotors.
General Electric has evaluated their plant applications and has issued a service information letter with their recommended actions.
It is our understanding that Limitorque was not a participant in the planning or conduct of the testing.
It is also our understanding that your company has been appraised of the results and have had an opportunity to review them.
Since several non-GE plants have LOCA profiles approaching that of the General Electric /Wyle test and your valve operators may have been qualified for Nuclear use by other companies or utilities without your participation, we request a listing of those customers which have purchased or ordered valve operators that contain magnesium motor rotors.
This information will allow us to compare the test failure data, the plant specific accident profiles, the plant specific applications and other EQ tests involving magnesium rotors. We will then determine the need, if any, for action by the NRC. We appreciate your coopera-tion in this matter.
Sincerely, ovintnv131me de Robert L. Baer, Chief Engineering and Generic Communications Branch y'_
N Division of Emergency Preparedness s
')
and Engineering Response
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Office of Inspection and Enforcement cc: M Daniel S. Warsing, Limitorque DISTRIBUTION JMTaylor RHVollmer ELJordan SASchwartz JGPartlow BKGrimes JAxelrad RLBaer AWDromerick JCStewart CERossi GGZech EBaker HGarg GHubbard J6R DCS DEPER R/F EGCB R/F JCStewart R/F
- See previous concurrences
/fv6
- DEPER:IE
- DEPER:IE DEPER:IE JCStewart AWDromerick RLBaer 10/ /85 10/ /85 10///85