ML19317F163
| ML19317F163 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 11/12/1974 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317F149 | List: |
| References | |
| NUDOCS 8001080883 | |
| Download: ML19317F163 (1) | |
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DL*KE POL'ER CO::PANY OCONEE UNIT 3 Report No.:
A0-287/74-6 Report Date:
Nove=her 12, 1974 Occurrence Date: October 29, 1974 Facility: oconee Unit 3, Seneca, Scuch Carolina Identification of Occurrence:
Low Pressure Injection System Sample Line Failure Conditions Prior to Occurrence:
Unit in Cold Shutdown Description of Occurrence:
On October 29, 1974, an Oconee Unit 3 utility operator discovered a leak in the Low Pressure Injection Systes piping in the decay heat re= oval room.
The leak was from a co= son sa=ple line for the A and B low pressure injection discharge headers.
Ihe isolation valve for the operating A header, 3LP-38, was closed while the isolation valve 3LP-39 for the idle header was open because sa:pling was in progress.
Valve 3LP-39 was closed to isolate the B header and stop the leakage. Approximately 40 gallons of water.had gravity drained from the B discharge header.
Desienation of Apparent Cause of Occurrence:
The leak occurred approximately two inches from the A header isolation valve.
The piping, 3/8 inch stainless steel, appears to have failed due to vibration of the low pressure injection discharge header.
I Analysis of Occurrence:
Oconce Unit 3 was in a cold shutdown condition with the A Lo
- Pressure In-jection (LPI) Systes operating in the decay heat re= oval modi..
The leak in the sa=ple line did not affect operation of the operating LPI train and was isolable from the idle train.
The small siae of the piping involved would not have affected the decay heat recoval operatica nor operation of the system in the unlikely event of an Engineered Safeguards actuation.
This sample line is normally isolated except when sampling is in progress.
It is concluded that this occurrence did not affect the health and safety of the public.
Corrective Action:
The sample line has been repaired and a coil added to absorb vibrational st ress. A design evaluation is underway to deter =ine the best solution for eliminating vilratory problems in the LPI Systes during operation in the decay heat removal mode.
8001080 k3 h