ML20236B883
| ML20236B883 | |
| Person / Time | |
|---|---|
| Site: | Kansas State University |
| Issue date: | 03/02/1989 |
| From: | Faw R KANSAS STATE UNIV., MANHATTAN, KS |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| NUDOCS 8903210351 | |
| Download: ML20236B883 (1) | |
Text
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3 @' @ {R UN8 [S T wa - 61989]l
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- g '1 Department of Nuclear Engineering
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1 6
3GlQqEAS Ward Hall h.;
ansas N N
9 3h"f, UNIVECRSITY I
2 March 1989 '
U. S. Nuclear Regulatory Commission, Region IV 611 Ryan Pla::a Drive, Suite 1000 Arlington, TX 70011 Re: License R-68 Docket 50-188 I
Dear Sina.
1 This is to report a malfunction of the drive for a standard control rod.which j
took : place on 1 Mar 1989. at the KSU TRIG A MkII. Nuclear Reactor
' Facility, Reector startup was in progress after previous operation earlier in
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the day.
The safety rod was withdrawn fully and one standard rod, the I
shim ' rod,.- was partically withdrawn. As the second' of two standard rods,
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the reg rod, was' being withdrawn, the other two rods were automatically
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"ectammed.". At that point,, the reg rod was manually driven into the core.
l Then, with the safety and shim rods fully inserted, an attempt was made to withdraw the reg rod. The reg rod could only be partially withdrawn and automatically.was " scrammed" at approximately the same rod position that the prior shim and safety rod insertion had been triggered. A second test l
revealed that the manual scram capability was not impaired and at no time was a safety system prevented from performing its function. The reactor was then secured and an investigation undertaken.
' Inspection of the ' reg ' rod drive mechanism revealed frayed. wires and an apparent short circuit in the. magnet-power supply line, it is our intention to remove, disassemble, inspect, and test the control-rod drive mechanism or the entire and, as necessary, to replace the -electromagnet supply line electromagnet assembly.
To prevent re-occurence, we plan. to modify our procedure for biennial control rod inspection to' include inspection of the f
entire rod-drive mechanism and,' as well, the console's rod-drive switch assembly.
[
Sincerely, I
- f..
Richard E. Faw, Director KSU Nuclear Reactor Facility i
l cc: Reactor Safeguards Committee j!
i 8903210351 090302 PDR ADOCK 05000108 S
PNU:
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