ML19353A186
| ML19353A186 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 12/22/1980 |
| From: | Ohanlon J ARKANSAS POWER & LIGHT CO. |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| ANO-80-6068, RO-80-91, NUDOCS 8101070399 | |
| Download: ML19353A186 (1) | |
Text
ARKANSAS POWER & LIGHT COMPANY Arkansas Nuclear One Russellville, Arkansas December 22, 1980 ANO-80-6068
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Mr. Karl Seyfrit, Director Office of Inspection & Enforcement Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011
SUBJECT:
Arkansas Nuclear One - Units 1 & 2 r
Reportable Event 50-368/80-91 0,
Dear Mr. Seyfrit:
This is to confirm the conversation between Mr. Bill Johnson (NRC, Resident Inspector) and Mr. T. L. Bell (Arkansas Nuclear One (Opera-tions Superintendent) at approximately 0730 on December 20, 1980.
This is reported to you in accordance with Unit Two Technical Speci-fication 6. 9.1. 8.b.
While performing the required Technical Specification channel checks on the Refueling Water Tank (RWT) level indication, it was observed that Channel A, C, and D were indicating 100% and Channel B was reading 82%. Previous readings indicated from 93 to 95% on all RWT level in'dications. The discrepancy was diagnosed as frozen RWT level t
I transmitters due to 15 F ambient temperature. An immediate plant shutdown per Technical Specification 3.0.3 was commenced at 0540 CST 12-20-80.
The NRC was notified per 10 CFR50.73 at 0545 CST on 12-20-80, l
and the Arkansas Office of Emergency Services was notified at 0605 CST on 12-20-80. The unit was tripped from 30% power at 0625 in order to achieve Mode 3 conditions required by Technical Specification 3.0.3.
Investigation into this incident revealed that the transmitter bodies were frozen. The heat tracing circuit was found de-energized because the main line fuse was removed.
Investigation into the cause of fuse removal is continuing. All transmitters were thawed, calibrated and returned to service at 1124 CST 12-20-80.
Very truly yours, 0-^~
J. P. O'Hanlon 40 j
General Manager g Q JPO:sbp 8101070 3 9 7
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