05000338/LER-1981-030-03, /03L-0:on 810421,emergency Diesel Generator Fuel Oil Storage Tank Fell Below Tech Spec Limit.Caused by Personnel Error.Tank Filled.Personnel Counseled

/03L-0:on 810421,emergency Diesel Generator Fuel Oil Storage Tank Fell Below Tech Spec Limit.Caused by Personnel Error.Tank Filled.Personnel Counseled

ML19345H437
Person / Time
Site:	North Anna
Issue date:	05/15/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345H436	List: 05000338/LER-1981-030, Forwards LER 81-030/03L-0 05000338/LER-1981-030-03, /03L-0:on 810421,emergency Diesel Generator Fuel Oil Storage Tank Fell Below Tech Spec Limit.Caused by Personnel Error.Tank Filled.Personnel Counseled
References
LER-81-030-03L, LER-81-30-3L, NUDOCS 8105200288
Download: ML19345H437 (3)

LER-1981-030, /03L-0:on 810421,emergency Diesel Generator Fuel Oil Storage Tank Fell Below Tech Spec Limit.Caused by Personnel Error.Tank Filled.Personnel Counseled

Event date:
Report date:
3381981030R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT Q

CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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/V/A/N/A/S/1/ (2)

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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

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DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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On April 21, 1981 the level of an emergency diesel generator fuel oil storage /

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tank dropped below the minimum level required by T.S.

3.8.1.1.

This event is /

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reportable pursuant to T.S. 6.9.1.9.b.

Both Unit 1 and 2 were at 100 percent /

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power when the event occurred. The action statement of the LCO was met.

The /

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public health and safety were not affected.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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SEQUENTIAL OCCURRENCE REPORT REVISION LEri/R0 EVENT YEAR REPORT NO.

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER g/ (18) g/ (19) LZ/ (20) LZ/ (21) /0/0/0/0/ (22) g/ (23) g/ (24) g/ (25) /Z/9/9/9/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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Personnel errors allowed the tank level to fall below T.S. limits before

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effective actions were taken to restore level. The tank was filled above the /

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T.S. minimum level by a tank truck. Personnel involved were instructed to

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closely observe the storage tank level durirg high use periods

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS

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OPERATOR OBSERVATION

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ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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PERSONNEL EXPOSLTES NUMBER TYPE DESCRIPTION (39)

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PERSONNEL INJ1? RIES NUMBER DESCRIPTION (41)

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LOSS OF OR DAMAGE TO FACILITY

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 81052 ng f(g

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Virginia Electric and Power Company 4'

North Anna Power Station, Unit #1 Attachment: Page 1 of 2 Docket No. 50-338 Report No. LER 81-030/03L-0

Description of Event

On April 21, 1981 a level reading taken at 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on an under-ground 50,000 gallon emergency diesel generator fuel oil storage tank, 1-EG-TK-2A, showed the level had dropped below the minimum level required by the T.S. 3.8.1.1.

Both Unit I and 2 were at 100 percent power when'the i

event occurred. This event is reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of' Occurrence Two underground 50,000 gallon storage tanks supply four diesel generator sets, two for each unit, with fuel oil. The level required i

in each tank is 45,000 gallons (approximately 7 days supply for one diesel j

generator set). The level dropped to approximately 44,750 gallons in tank 1

1-EG-TK-2A and was below the T.S. level.for a maximum of 21 hours2.430556e-4 days <br />0.00583 hours <br />3.472222e-5 weeks <br />7.9905e-6 months <br />. The effect of the low level on the expected run times of the emergency diesel generators available from the underground tanks was negligible._ The action statement of the LCO was met. The public health and safety were not affected.

Cause of Event

Several test runs of emergency diesel generators were made during the day and evening of April 21, 1981. Personnel errors allowed the tank level to fall below T.S. limits before effective actions were taken to restore the tank to a normal level.

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Immediate Corrective Action

Normally makeup to the underground emergency diesel generator tanks. is supplied from a 5,000 barrel above ground tank; however, a sample of the fuel oil in the tank taken several hours before the event was discovered showed an unacceptable water content. The sample i

had been taken from a tank drain.as called for by station operating procedures before making up to the below ground tanks. Water in the bottom of 5,000 barrel fuel oil tank is an infrequent but not unexpected event.

The purity of the station emergnecy diesel fuel oil in the above ground tank, both below ground tanks, and each diesel generator day tank is periodically checked via the periodic test program.

Since the purity of the fuel oil in the 5,000 barrel at the transfer line level (4 inches above the drain level) had not been established, a tank truck was ordered. After a sample of fuel oil from the tank truck was analyzed with satisfactory results, 1-EG-TK-2A was filled above the minimum level required by the Techniesl Specifications at 0430 on April 22.

3 Subsequent Corrective Action i

After down loading a small amount of fuel oil into a tank truck from the 5,000 barrel above ground tank, a fuel oil sample taken from the tank drain was clean and water free. After completion of down loading operations and confirmatica from chemistry that the above ground tank fuel oil was satisfactory, underground tank 1-EG-TK-2A was filled to a normal level at 0620

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on April 23.

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- o Attachment: Page 2 af 2 Scheduled Corrective Action No scheduled corrective actions are required.

Actions Taken to Prevent Recurrence Personnel involved were instructed to closely watch the levC 1n the underground emergency diesel storage tanks during periods of extensive emergency diesel generator testing.

Generic Implications This event had no generic implications.

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