ML19256A867

LER 78-070/03L-0 on 781215:low Flow Condition Noted on Auxiliary Bldg Exhaust.Investigation Showed That AHF-14D Had Ejected All Blades.Caused by Possible Damage That Occurred During Event 78-064/03L-0

ML19256A867
Person / Time
Site:	Crystal River
Issue date:	01/08/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256A866	List: ML19256A865 ML19256A867
References
LER-78-070-03L, LER-78-70-3L, NUDOCS 7901160253
Download: ML19256A867 (2)

Text

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, , ,19 December 1978. This event is contrary to Technical Specification 3.7.8.1, o , l No effect on public health anil safety as redundant fans AHF-14A and AHF-14C i o44 I were operable. Seven oreviotis occurrences of this tvne. I sci [a" T$e's sus'E$$a ceveoNawr:cos su'sS"[cr sENNs oi.

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• SUPPLEMENTARY INFORMATION

1. Report No.: 50-302/78-70/03L-0

2. Facility: Crystal River Unit #3

3. Report Date: 8 January 1979 4 Occurrence Date: 15 December 1978

5. Identification of Occurrence:

One pair of Auxiliary Building exhaust fans inoperable contrary to Technical Specification 3.7.8.1.

6. Conditions Prior to Occurrence:

Mode 1 power operation (98%).

7. Description of Occurrence:

At 0530 while performing Surveillance ?rocedure SP-335A (Radiation Monitoring Functional) a low flow condition was noticed on Auxiliary Building exhaust AHF 14 A and AHF-14 C were started and AHF-14.B and AHF-14.D secured. Subsequent investigations revealed that AHF-14D had ejected all blades. AHF-14D was repaired, tested, and returned to service 19 December 1978.

8. Designation of Apparent Cause:

The cause of this event is attributed to possible damage that occurred during event 78-064/03L-0.

9. Analysis of Occurrence:

There was no safety hazard to the plant or general public as redundant fans AHF-14A & C were operable.

10. Corrective Action:

No corrective action necessary as all fan blades were replaced.

11. Failure Data:

Seven previous occurrences, but first occurrence of this type.

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