ML19308D552

RO-77-76:on 770707,auxiliary Bldg Exhaust Fan AHF-14D Failed to Restart After Charcoal Filter Sampling.Caused by AHF-14D Low Flow Switch Shifting Calibr.Switch Calibr & Fan Operability Restored

ML19308D552
Person / Time
Site:	Crystal River
Issue date:	07/29/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D548	List: ML19308D547 ML19308D552
References
NUDOCS 8002280984
Download: ML19308D552 (2)

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EVENT DESCRPTION 33 l The Auxiliary Building exhaust fan AHF-14D would'not restart after being secured for 7 89 t

g l charcoal' filter sampling resulting in a condition contrary to Technical Specification 7 89 L

M l 3. 7.8.1.

Redundancy was maintained with fans AHF-14A & 14C. This occurrence was non-7 89 t.

g l repetitive. The low flow switch for AHF-14D was calibrated and fan restored operable 7 09 E

gtg lwithin 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

(LER 77-76)

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7 89 10 11 12 17 43 44 47 48 CAUSE OESCR!PTION

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l This occurrence was due to the ARF-14D low flow switch shifting calibration. The low flow e

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a9 l switch was cali', rated and AHF-14D restored operable.-

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% POWER oTHER STATUS Cs VE OSCoVERY CESC3PT:CN y

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SC o O ELEASE AMOUNT OF ACTMTY LOCATON CF RELEASE W

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10 11 44 45 Bi PERSONNEL EXPOSURES NUMBER TYPE DESCRPTCN M l 0l 0l 0l (Z_j l

NA 7 89 11 12 13 66 PERSONNEL IN. LURES s

NUMBER DESCRPTON M l0l0l0l l

NA 7 89 11.1 2 BC OF'FSITE CONSECUENCES nl NA 7 89 UL LOSS OR OAMAGE TO FACILITY TYPE DESCRPTON Ql NA 1

7 80 10 LC PUBLICITY 17 l va 7 89 UC ADOITIONAL FACTORS 80'29on9M9 l

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.See Attached Supplementary Information 7 89 l

W. P. Stewart PHONE: (813) 866-4159 NAME*.

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SUPPLEMENTARY INFORMATION C.

Repoet No.:

50-302/77-76 2.

Facility:

Crystal River Unit #3 3.

Report Date:

29 July 1977 4.

Occurrence Date:

7 July 1977 5.

Identification of Occurrence:

Less than the minimum required number of Auxiliary Building exhaust fans in operation contrary to Technical Specification 3.7.8.1.

6.

Conditions Prior"to Occurrence:

Mode 1 power operation.

7.

Description of Occurrence:

At 1450 the Auxiliary Building ventilation fan AHF-14D was secured for required charcoal ll filter sampling. Upon completion of sampling, AHF-14D would not restart. AHF-14D nor-mally is utilized with AHF-14B as one pair of required exhaust fans. With the loss of one pair of fans the 7 day action statement of Tech. Spec. 3.7.8.1 was entered. Mainten-ance was performed and ARF-14D was restored operable in approximately 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

i. Designation of Apparent Cause:

The cause of this event was due to the fan's low flow switch being out of calibration.

9.

Analysis of Occurrences The safety and health of the plant and public were not affected, as redundant auxiliary ventilation fans AHF-14A and AHF-14C were operable and in service.

10.

Corrective Action:

The Auxiliary Building exhaust fan AHF-14D low flow switch was recalibrated and fan restored operable.

11.

Failure Data:

This was the first occurrence of this event.

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