ML19317G186

RO-77-83:on 770712,level a Channel Removed from Svc Due to Disagreement Between a & B Level Channels.Caused by Level Indication Transmitter Calibr Shift.Instrument Calibr & Channel Operability Restored

ML19317G186
Person / Time
Site:	Crystal River
Issue date:	08/05/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19317G181	List: ML19317G180 ML19317G183 ML19317G185 ML19317G186
References
NUDOCS 8002280824
Download: ML19317G186 (2)

Text

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, ,, - . .s LICENSEE EVENT REPC'T i{ (,)~ C$NTROL BLOCK.l l l l l l l [PLEASE PRINT ALL REQUIRED inFORT.1AT*CtJ) 1 1 6 Ifaut LcENSE NUMDER

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09 60 61 68 69 74 75 80 EVENT DESCRIPTION Ql Due to a disagreement in the level indication of the "A" and "B" level channels of the l 7 09 60 0 l BWST, the "A" channed. was removed from service. This action resulted in having less than l 7 o9 .

go gl the minimum required level indication channels as defined by Table 3.3-10 of Tech Spec l

05 3.3.3.6. Redundancy was maintained with the ','B" level indication channel. First time e 7 o9 g[ occurrence. "B" level channel restored operable on 13 July 1977. (LER 77-83) 60 7 89 paMe 80 DE CODE COMPONENT CCCE A V N TON b lSlFl 7 89 10 12 lIlN lS lT l RlUI lN l l Bl 0 l4 l5 l l Nl (

11 17 43 44 47 48 .

CAUSE DESCRIPTION )

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@ l This. event was due to a calibration shift of level indication transmitter. Instru=ent was j 7 89 SO O9 l calibrated and channel restored operable.

7 09 l 80 V -

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- FACIUTY METHOD OF STATUS  % POWER oTHER STATUS CGCQVERY DSCOVERY DESCRPT'.CN 1

l El l 1l 0l 0l l NA l W l NA l

7-G 9 10 12 13 44 45 46 60 ACTMTY CONTENT RELEASED AMOUNT OF ACTMTV . LOCATON OF DELEASE 1

7 8 9 l Zl OF ]AELEASE l 10 11 NA 44 l l 45 NA l

PERSONNEL EXPOSURES 80 NUMOEA TYPE CESCRIPTCN 3 l Ol 0l 0l Wl 7 89 12 NA l

11 13 60 -

PERSONNEL INJURIES

• NUMOEA DESCRiPTON -

7 8 89' I ni ni' nl~11 12l NA l

60 OFFSITE CONSEQUENCES 15 l

• NA '

l 7 00 00 LOSS OR DAMAGE TO FACIUTY TYPE CECCR:PTCN .

I 7 89 10  !

60 PUBLICITY 8I 7 80 I 00

^ 'OITIONAL FACTORS gQQg g8Q 11 uo See attached Sucolerentary Information f ,j Ohl 1 C I

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g Hu NAME: N. P. 9 vart Ib PHONE: (813) 866-4159 7

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SUPPLEMENTARY INFORMATION Report No.: 50-302/77-83

2. Facility: Crystal River Unit #3_ -

3. Report Date: ~ 5 August 1977

4. Occurrence Date; 12 July 1977

5. Identification of Occurrence:

Failure to have two chancels of Borated Water Storage Tank level indication operable as required by Table 3.3-10 of Technical Specifications 3.3.3.5.

6. Conditions Prior to Occurrence:

Mode 1 power operation

7. Description of Occurrence:

At 1500 the "A" Borated Water Storage Tank level channel was taken out of service to i perform maintenance, as there had been a disagreement between the indications of the .-

"A" and "B" channels. A determination was made that the "A" channel was in error. "

The action statement of Tech Spec 3.3.3.6 was entered and maintenance restored the "A" channel operability'of 13 July 1977.

% Designation of Apparent Cause:

s This event was due to a calibration shift of the "A" level transmitter.

9. Analysis of Occurrence:

There was no safety hazard to the plant or public, as the redundant "B" channel of level indication was operable and in service.

. 10. Corrective Action:

None required as normal maintenance restored operability.

J 11. Failure Data:

This 'fas the first occurrence of this event.

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