05000280/LER-1982-081-03, /03L-0:on 820823,steam Flow Transmitter FT-1-495 Failed Low.Caused by Faulty Power Supply.Power Supply Replaced.Affected Instrument Channel Checked Satisfactorily & Returned to Svc

/03L-0:on 820823,steam Flow Transmitter FT-1-495 Failed Low.Caused by Faulty Power Supply.Power Supply Replaced.Affected Instrument Channel Checked Satisfactorily & Returned to Svc

ML20027B293
Person / Time
Site:	Surry
Issue date:	09/10/1982
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027B291	List: 05000280/LER-1982-048-03, /03L-0:on 820813,discovered That Uncollected Leakage of 2-CH-P-1C Was in Excess of Tech Spec Limit.Two Pumps Simultaneously Inoperable,Contrary to Tech Specs.Leak Caused by Loose Flange Bolt.Bolt Lubricated 05000280/LER-1982-050-03, /03L-0:on 820817,charging Pump Svc Water Low Pressure Alarm Sounded.Svc Water Pump 10B Auto Started But Did Not Restore Sys Pressure.Caused by Insufficient Npsh. Svc Water to Chiller Reduced & Pump Vented 05000280/LER-1982-081-03, /03L-0:on 820823,steam Flow Transmitter FT-1-495 Failed Low.Caused by Faulty Power Supply.Power Supply Replaced.Affected Instrument Channel Checked Satisfactorily & Returned to Svc ML20027B290
References
LER-82-081-03L, LER-82-81-3L, NUDOCS 8209200236
Download: ML20027B293 (2)

LER-1982-081, /03L-0:on 820823,steam Flow Transmitter FT-1-495 Failed Low.Caused by Faulty Power Supply.Power Supply Replaced.Affected Instrument Channel Checked Satisfactorily & Returned to Svc

Event date:
Report date:
2801982081R03 - NRC Website

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I ATTACHMENT 1 SURRY POWER STATION, UNIT NO.1 DOCKET NO:

50-280 REPORT NO:

82-081/03L-0 EVENT DATE:

08-23-82 TITLE OF THE EVENT: FT-1-495 Failed 1.

DESCRIPTION OF THE EVENT:

With the unit at 100% power, steam flow detector FT-1-495 failed low.

This is contrary to Tech. Spec. Table 3.7.2 and is reportable per T.S.

6. 6. 2. b (2).

2.

PROBABLE CONSEQUENCES and STATUS of REDENDANT EQUIPMENT:

Each main steam line has 2 steam flow detectors that are used in conjunction with a low Tavg or low steam line pressure signal t6 initiate safety injection for steam line break protection.

The redundant steam flow channel was operable, therefore the health and safety of the public were not affected.

s 3.

CAUSE

Steam flow detector FT-1-495 failed low because the channel power supply fail ed.

4.-

IMMEDIATE CORRECTIVE ACTION

The associated bistables were placed in the trip mode and remained tripped until the channel was returned to service.

5.

SUBSEQUENT CORRECTIVE ACTION:

The failed power supply was replaced.

• 6.

ACTION TAKEN TO PREVENT RECURRENCE:

The faulty power supply was installed in February of this year. This power supply is a new type installed in conjunction with a design change and is the first of this type to fail, therefore this event is considered random and no further actions are necessary.

7.

GENERIC IMPLICATIONS:

None.

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