ML19308D280

RO-77-63:on 770615,reactor Bldg Cooling Fan AHF-6A Failed, Rendering Containment Hydrogen Purge Sys Inoperable.Caused by Loose Electrical Connection.No Adverse Safety Effects

ML19308D280
Person / Time
Site:	Crystal River
Issue date:	07/07/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D102	List: ML19308D101 ML19308D280
References
NUDOCS 8002270726
Download: ML19308D280 (2)

Text

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@l 7 il 9 inoperable contrary co Technieal Specification 3.6.4. 2.

Redundancy maintained by

@l IU AHF-68. First occurrence. AHF-6B employed as necessary until AHF-6A returned to 7 ti u El operability.

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'f l loose connection on thermal overload heater prevented fan operation. Connection l 7 n9 oce u l tightened and' fan returned to service after operat'ional check.

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$UPPLEMEffrARY INFORMATION 4

1. Report No. : 50-30L. 1-63

2. Facility: Crystal River Unit #3

3. Report Date: 7 July 1977 4 Occurrence Date: 15 June 1977

5. Identification of Occurrence:

Failure of AHF-6A to start rendering the containment hydrogen purge system inoperable contrary to Technical Specification 3.6.4.2.

6. Conditions Prior to Occurrence:

Normal Mode 1 power operation. _.

7. Description of Occurrence:

At 1300, in the process of purging the Reactor Building, the Reactor Building cooling fan AHF-6A could not be started from the Control Room. Investigation revealed loose e' lectrical connector on thermal overload heater. After tighten-s ing connection and operational check, fan was returned to service.

8. Designation of Apparent Cause:

Loose electrical connection.

9. Analysis of Occurrence:

The safety to the plant and general public was not affected as redundant Reactor Building cooling fan AHF-6E was operable and available.

10. Corrective Action:

None required as this was.an isolated event.

11. Failure Data:

This is the first occurrence of this event.

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