ML20027B888

LER 82-055/03L-0:on 820825,feedwater Ultrasonic Flow Indicator FW-313-FI Found Inoperable.Caused by Instrument Failure Due to High Ambient Temp at Instrument Cabinet Location.Instrument Repaired.Flow Transmitters Replaced

ML20027B888
Person / Time
Site:	Crystal River
Issue date:	09/24/1982
From:	Ford E FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027B875	List: ML20027B874 ML20027B888
References
LER-82-055-03L, LER-82-55-3L, NUDOCS 8209300266
Download: ML20027B888 (2)

Text

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DATE 7. 7s RE, ORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES -

ITTTI I Two occasions on 8/25/82, at 093 and 1630, during daily surveillance .

i g , it was discovered that .Feedwater Ultrasonic Flow Indicator FW-313-FI

, was inoperable. This event apparently causes one train of Emergency Feed I

g , Water to be inoperable which is a degraded mode of operation allowed by ggy , T.S.3.7.1.2. Flow indicator FW-312-FI remained available to indicate o > l Emergency Feedwater Flow if required. There wa's no effect upon public ,

, , , health or safety. These were the 5th and 6th events for this instrument.

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ITTF11 Instrument failure is attrib d to high ambient temperature at the

, , , instrument cabinet location. The instrument was repairedana operability ,

, ,, restored at 1500 on 8/25/82 and again at 0200 on 8/28/82. Investigation ED3 I into relocating the cabinet has been initiated. Long tenn corrective I

g, action will be replacement with conventional flow transmitters.

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61 SUPPLEMENTARY INFORMATION -

REPORT NO: 50-302/82-055/03L-0 FACILITY: Crystal River bnit #3 REPORT DATE: September 24,1982 OCCURRENCE DATE: August 25,1982 IDENTIFICATION OF OCCURRENCE:

Emergency Feedwater Flow Indicator FW-313-FI was inoperable. This event was interpreted to constitute inoperability of an Emergency Feedwater train, which is a degraded mode of operation allowed by Technical Specification 3.7.1.2.

CONDITIONS PRIOR TO OCCURRENCE:

Mode I, Power Operation, (95% Full Power).

DESCRIPTION OF OCCURRENCE: 1 Two occasions on August 25,1982, at 0935 and at 1630, during daily surveillance, Emergency Feedwater Ultrasonic Flow indicat_or FW-313-FI was found to be inoperable. The "B" train of Emergency Feedwater was arbitrarily declared inoperable on both occasions. The flow indicator was repaired and operability was restored at 1500 on August 25, 1982 and again at 0200 on August 28,1982. Flow i indicator FW-312-FI and steam generator level indicating instruments remained operable during these events. All of these instruments are capable of indicating receipt of flow from either train of Emergency Feedwater.

DESIGNATION OF APPARENT CAUSE:

Instrument failure was apparently due to high ambient temperature at the instrument cabinet location.

ANALYSIS OF OCCURRENCE:

There -was no effect upon public health or safety. Indication of Emergency Feedwater flow remained available through other instrumentation.

CORRECTIVE ACTION:

Investigation into relocating the cabinet in an area of lower ambient temperature has been initiated. These instruments will be replaced with conventional flev transmitters in conjunction with the upcoming Emergency Feedwater upgrade.

FAILURE DATA:

These were the fifth and sixth occurrences for this flow indicator and the fifteenth report under specification 3.7.1.2.

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