ML19350C463
| ML19350C463 | |
| Person / Time | |
|---|---|
| Site: | Rensselaer Polytechnic Institute |
| Issue date: | 02/14/1981 |
| From: | Nelson P RENSSELAER POLYTECHNIC INSTITUTE, TROY, NY |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8104010824 | |
| Download: ML19350C463 (1) | |
Text
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Deptrtm:nt of Nuct:ar Enginesring C.>h Rensselaer Polytechnic Institute Troy, New York 12181 4
Y February 14, 1981 Y
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Director, Region I D
Nuclear Regulatory Comission King of Prussia, PA 19406
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Subject:
Safety system component failure at the RPI CEF (CX-22)
Daar Sir:
During a pre-startup check it was discovered that the Moderator Dump valve solenoid was failed.
The normal attempt to energize the solenoid for Moderator fill was unsuccessful.
The solenoid positions a two position air valve to pneumatically hold the Moderator butterfly shut when the safety amplifier circuits are energized. A scram signal drops the Moderator level by deenergizing the solenoid.
The system serves as a supplementary scram function since the control rod shutdown margin surpasses License specification.
NRC Region I headquarters was notified by telephone of the event.
There existed no question of safety significance since tne reactor was not operating and the coil failed in a manner which would cause a reactor shutdown.
The component has been repaired and reinstalled.
Tests of the system were satisfactory.
The facility is in a normal operational mode.
Sincerely yours,
. fi 0-?Yj l
11/'
Peter R. Nelson
'/
' Supervisor Critical Experiments Facility L.D. Walthousen Laboratory PRN:jm cc: D.R. Harris
_f 8104010824