ML19308D287

RO-77-64:on 770616,auxiliary Bldg Exhaust Fans Ahf 14A & 14C Inoperable.Caused by Sys Ductwork Vibration Causing Hole Between Fans & Discharge Damper.Laminated Patch Installed to Strengthen Ductwork

ML19308D287
Person / Time
Site:	Crystal River
Issue date:	07/08/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D095	List: ML19308D094 ML19308D287
References
NUDOCS 8002270733
Download: ML19308D287 (2)

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. PE TYPE 7 89 F l L l~ C'l R l P l 3 l 14 l 0 l 0-l-l 0l 0 l 0 l 0 l 0 l-l 0 l 0 l 15 l 4l 1l 1l 1l 1l l 0l 3l 25 26 30 31 32 CATECCRY T7PU S5 N COCKET NUMOER EVENT DATE AEPOAT CATE

@ CON'T l - l - l lLl lLl l0l5l0l-l0l3l0l2l l 0l 6l 1l 6 l7 l7 l l0 l 7l 0 l 8 l 7 l 7 l 7 0 57 50 59 60 61 68 69 74 75 00 EVEtjT DESCR:PTION o2 l Inoperability of one pair of Auxiliary Building exhaust fans contrary to Technical l 7 89 00 03 l Specification 3.7.8.#1. Redundant fans were operable and available. First occurrence l 7 89

• 00 04 l of this event. Repairs to ductwork restored fans operable on 21 June 1977. l 7 89

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CCMPoNENT COCE U t VOLADou h lAl Al d 7 89 10 11 lZlZlZlZlZlZl17 12

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43 44 47 CAUSE DESCRIPTION O

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3C l Ductwork vibration caused a leak in duct between the fan exhaust and the discharee l 7 89 GO O9 l damper.

Leak was reoaired with a laminated catch 'to strenethen the ductwork and l 7 09 60 P' preclude reoccurrence.

l 5 TUS  % POWER bfHERSTATUS D3COVERY OCCOVERY CESCRIPTON 70 1

9 W 10 l 0l9 l5 l l 12 13 NA l lAl l NA l 44 40 46 60 EASED OF ASE AMOUNT OF ACTMTY 1

7 8 W

9 dl10 NA l 44' l

LOCATON OF AELEASE NA l 11 45 00 PERSONNEL E\'POSURES NUMBER TYPE DESCAiPTON 8 l 0 l 0 l 01 [Z_J l NA l

7 89 11 12 13 60 PERSONNEL INJunlES NUMDER DESCRPTCN 8 10l0l01.11 12 7 09 I NA l

60 OFFSITE CONSEQUENCES 3D l ' NA l

7 0D 00 LOSS OR CAP.1AGF TO FAC!UTY TYPE DESCA:P'ON

@dl NA 7 89 10 _l LO PUDLfCITY 8I

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L:0 "GOITIONAL FACT 0nS

!1 See attached Supolementarv Information ,j ,

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800227o 73 3 I

' UU l , nu NAME: N. D. S t e'm rt

, THONE: (813) 866-4159

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• SUPPLEMENTARY INFORMATION

1. Report No.: 50-302/77-64

2. Facility: Crystal River Unit #3

3. Report Date: 8 July 1977

4. Occurrence Date: 16 June 1977

5. Identification of Occurrence:

Inoperability of one pair of Auxiliary Building erhaust fans contrary to Technical Specification 3.7.8.1.

6. Conditions Prior to Occurrence:

Mode 1 power operation ,-

7. Description of occurrence: s At 2120 the Auxiliary Building exhaust fans AHF 14A and AHF 14C were removed from service due to a duct leak located between the fans and the discharge damper. Entered a seven day Action Statement and the duct was repaired with a laminated patch. The system was restored operable on 21 June 1977.

'# 8. Designation of Apparent Cause:

The cause of this event was determined to be vibration of the system ductwork causing ' a hole between the fans and the discharge damper.

9. Analysis of Occurrence:

There was no safety significance in that redundant buiiding exhaust system was available and operable.

10. Corrective Action:

A laminated patch was installed and is expected to strengthen the ductwork to prevent reoccurrence.

11. Failure Data:

This was the first occurrence of such an event.

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