ML20073S177
| ML20073S177 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 04/26/1983 |
| From: | Mineck D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| DAEC-83-338, NUDOCS 8305060472 | |
| Download: ML20073S177 (1) | |
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Iowa Electric Light and Power Company April 26, 1983 DAEC-83 338 Mr. James G. Keppler Regional Administrator Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn,'IL 60137
Subject:
Prompt Notification of a Reportable Occurrence File: A-ll8a
Dear Mr. Keppler:
This letter, telecopied to your office, is intended to satisfy the re-quirement for prompt notification of a Reportable Occurrence in accordance with Specification 6.ll.2.a of the Duane Arnold Energy Center Technical Specifi-cations.
Technical Specification paragraph (s) violated:
3.1.A Description of Occurrence:
While in cold shutdown, with all rods inserted, the reactor mode switch was moved from the " Refuel" position to the " Shutdown" position. This should have caused a full scram. However, the "A" logic did not trip. A manual scram was inserted and a full scram was achieved.
Preliminary cause was determined to be failure of the "A" system shutdown scram reset interlock due to faulty solder connections.
This failure caused the Mode switch shutdown contacts to be bypassed.
Investigation into the root cause is continuing. The reactor is being maintained in cold shutdown.
Very truly yours, Daniel L. Mineck Plant Superintendent Duane Arnold Energy Center DLM/DRK/sg cc: N Resident Inspector 3599 8
5060472 030426 PDR ADOCK 05000331 S
MAY 9 983 Duane Arnold Energy Center e IW. Ikn 351. Cedar llapids, Iowa 52106 e 3IS'3517GII