ML20092C894
| ML20092C894 | |
| Person / Time | |
|---|---|
| Site: | Rensselaer Polytechnic Institute |
| Issue date: | 01/28/1992 |
| From: | Harris D, Muzzey E RENSSELAER POLYTECHNIC INSTITUTE, TROY, NY |
| To: | Block R RENSSELAER POLYTECHNIC INSTITUTE, TROY, NY |
| References | |
| NUDOCS 9202120159 | |
| Download: ML20092C894 (1) | |
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DEPAltTMENT OF NUCLEAll ENGINEEl(ING &
ENGINEERING PHYSICS INTERDEFARTMENTAL S1Eh10RANDUh1 ;
Date: January 28,1992 TO: Dr. Robert C. Block, Department Head &
Chairman, Nuclear Safety Review Board FROht: Dr. D.R. Ilartis, Director RCF e
\ '* + 1 E.F. Muzrey, Associate Enginee/vr N tY M T M i '
RE: Safety Switches Installed l
The installation of the Reactor Rod Drive Safety Switches required by the Nuclear Regulatory Commission is complete and tested. Individual testing of Rod i Drives 3,5,4, and 7 was conducted and completed on January 10,1992 by Associate Engineer, Ernest htuzzey, Facility Supervisor, Kenneth Connor, and David llayes.
The function of the switches is to disconnect "Up Drive" power to the Rod Drive if, in the event of a Rod Drive control malfunction, the Rod Drive raises the Reactor Control Rod past the 36" maximum designed rod extension. The Safety Switch operates independently of the Rod Drive Limit Switches and associated mechanical components. This was accomplished by mounting the Safety Switches to the bottom plate of the Reactor Rod Drive assembly and adjacent to the Rack Gear that pulls the control rod out of the reactor. A bracket directly mounted to the same Rack Gear as the Safety Switch is mounted next to activates the Safety Switch if the Rack Gear travels more than 36 inches. The Safety Switch does not require mechanical or electrical resetting and does not interfere with Scram or Control Rod Drive In function. A visual flashing function of the Up Limit Switch bulb in the control console now alerts the reactor operator to the fact that the Safety Switch has been activated.
DRH:Jjd ec: K. Connor, Supervisor R. Rohr Adjunct Professor D. Hayes hiembers, NSRB g A. Bergies, Dean, School of Eng. G. Judd, Vice Provost, Acad. Affairs
N l 0 9202120159 920120 PDR. ADOCK 05000225 P PDR
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