ML20069D277
| ML20069D277 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 09/13/1982 |
| From: | Mineck D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| DAEC-82-638, NUDOCS 8209210024 | |
| Download: ML20069D277 (2) | |
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Iowa Electric 1.ight and Ibwer Company September 13, 1982 DAEC 638 Mr. James G. Keppler Regional Administrator Region III U. S. Nuclear Regulatory Conunission 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Prompt Notification of a Reportable Occurrence File: A-118a, TE-4
Dear Mr. Keppler:
This letter, telecopied to your office, is intended to satisfy the requireinent for prompt notification of a Reportable Occurrence in accordance with Specification 6.11.2.a of the Duane Arnold Energy Center Technical Specifications.
Technical Specification paragraph (s) violated:
3.5.0.
Description of Occurrence:
During normal operation on 9/12/82, the HPCI inboard steam supply isolation valve M0V-2238 closed due to a false leakage signal from malfunctioning temperature differential switch TDS-2260. A 7-day LC0 was entered per Technical Specification (T.S.) 3.5.0.2.
The isolation signal was cleared and HPCI operational testing was begun. During this testing, HPCI fast-started in approximately 38 seconds instead of the required 25 seconds.
HPCI was declared inoperable and the operability of the other ECCS subsystems
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was tested. During testing, the RCIC turbine tripped at rated speed.
A 24-hour LCO was declared per T.S. 3.5.D.3 and reactor shutdown commenced. The 24-hour LC0 was reduced to a 7-day LC0 after approximately 6-3/4 hours when RCIC was tested satisf actorily and declared operable. HPCI was operability tested satisf actorily but the 7-day LC0 was not lifted per management decision. At 1020 on 9/13/82, the RCIC turbine tripped during daily surveillance. A 24-hour LC0 was entered per T.S. 3.5.D.3 and reactor shutdown SO g T3B?.
8209210024 820913 PDR ADOCK 05000331 S
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i Mr. James G. Keppler September 13, 1982 Page 2 connenced.
The 24-hour LC0 reverted to a 7-day LCO after approximately 4-1/2 hours when HPCI was tested satisf actorily and declared operable. The 7-day LCO was ended 9/13/82 at approximately 1600 when RCIC was declared operable.
Very truly yours, Daniel L. Mineck Plant Superintendent-Nuclear Duane Arnold Energy Center DLM/KLH/gr cc: NRC Resident Inspector Ed Cox l
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