05000280/LER-1981-036, Corrected LER 81-036/03L-0,changing Sequential Date of LER 81-033/03L-0.On 810528,sample of Emergency Diesel Generator Fuel Oil Storage Tanks Revealed Water in Tank 1-EE-TK-2A

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Corrected LER 81-036/03L-0,changing Sequential Date of LER 81-033/03L-0.On 810528,sample of Emergency Diesel Generator Fuel Oil Storage Tanks Revealed Water in Tank 1-EE-TK-2A
ML20009F723
Person / Time
Site: Surry  Dominion icon.png
Issue date: 07/03/1981
From: Joshua Wilson
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F711 List:
References
LER-81-036-03L-01, LER-81-36-3L-1, NUDOCS 8107310458
Download: ML20009F723 (3)
v • d • e


LER-1981-036, Corrected LER 81-036/03L-0,changing Sequential Date of LER 81-033/03L-0.On 810528,sample of Emergency Diesel Generator Fuel Oil Storage Tanks Revealed Water in Tank 1-EE-TK-2A
Event date:
Report date:
2801981036R00 - NRC Website
v • d • e

text

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IA routine sample of the EDG fuel oil storage tanks revealed water in tank 1-EE-TK-2A.

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The fuel oil transfer pumps were placed under administrative control and the water was ;

i is contrary to T.S. 3.16.A.5 and is reportable in accordance with ;

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2 CAUSE CESCRi!T1CN AND CCRnEc xvE A: :Ons The cause of this event has been ermined to be inadequate procedures for removing 1

is ics1 water from the above grouna storage tank and preventing its entry into the underground The water was drained via the transfer pump suction strainer drains.

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CORRECTED COPY-SEQUENTIAL #033 6-26-81 CHANGED TO #036 ATTACHMENT 1 (PAGE 10F 2)

SURRY POWER STATION, UNIT 2 DOCKET No:

50-281 REPORT NO:

81-03.603L-0 EVENT DATE: 05-28-81 TITLE OF THE EVENT: WATER IN TANK 1-EE-TK-2A 1.

DESCRIPTION OF THE EVENT:

On May 10,1981, fire water was used to leak test the reactor lower Laternals shield tank prior to installation. An open valve from the fire main to the-fire protection foam system allowed water to enter the above ground fuel oil storage tank, 1-HS-TK-1.

The tank was isolated and an estimated 4000 gallons of water drained. Samples were taken from the instrument connection, for 1-HS-TK-1, and found to be free of water. The outlet to the underground tanks were verified closed and as a precaution, the valves were tagged cicaed.

The samples that were taken from the instrument connection on 1-HS-TK-1 were not representative. Although the instrument connection on this tank appears to be the lowest connection, both outlets are, in fact, lower. The outlet to the underground tank being 2 inches lower and the outlet to the hose connection 4" lower. During the week (May 10-15), the above ground tank was sampled for water, from the instrument connection, each day before verifying that the under-ground tanks were full. During this time, water apparently entered the 'A' underground tank.

A week later, while filling a vehicle from the hose connection, wat'er was again discovered. Th'e tank was thea drained from the hose connection until all the water was removed.

At 0530 hrs. on May 28, 1981, a routine sample of the underground fuel oil l

tanks revealed water in tank 1-EE-TK-2A.

The fuel oil transfer pumps', asso-ciated with tank 2A, were placed under administrative control and samples taken from the suction strainers showed that. water had not reached the pumps, l

f However, additional draining from this point and the underground tank's mano-meter connection did produce water at both of these locations.

The wall tanks, located in each EDG room, were sampled and no water was found.

l Tne wall tanks were partially drained and then refilled; from the-underground tank 2A, several times. A small quantity of water was subsequently drained f

from the wall tanks.

I At 1525 hrs., samples o,f the wall tanks, the underground tank make up line, f

and the transfer pump suctions were all free of water. The transfer pumps were returned to automatic and the 2A underground' tank refilled.

Af ter the underground tank was filled,. additional water was drained from the manometer connection. To verify that the water level was below the transfer pump suction,' 45 gallons of fuel oil was drained from ' A' pump and 10 gallons from 'B'

& 'C' pumps. Sanples taken from each pump were free of water. How-ever, for the next three shif ts, water was drained from the manometer connection.

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This event is contrary to Tech. Spec. 3.16.A.5 and is reportable per Tech.

Spec. 6.6.2.b. (2).

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ATTACHliENT 1 (PAGE 2 0F 2)

SURRY POWER STATION, UNIT 2 DOCKET NO:

50-281 REPORT NO:

81-036/03L-0 EVENT DATE:

05-28-81 2.

PROBABLE CONSEQUENCES AND STATUS OF REDUlT:' ANT EQUIPMr23 The emergency diesel generators provide power to vital equipment in the event of a loss of normal power. The outlets of the fuel oil tanks are designed to allow for some accumulation of water. Between 5-10-81 and 5-28-81, the EDG's were operated intermittently for about 8 hrs. total without any problems. The redundant flow path from 2B underground tank was operable and free of water.

Therefore. the health and safety of the public were not affected.

3.

yAUSE:

The cause of this event has been deter dned to be inadequate procedures.

Specifically, the lack of guidance for the sampling of fuel oil tanks.

4.

L M IATE CORRECTIVE ACTION:

The fuel oil trcusfer pumps in the affected train were placed under adminis-trative control and the other train was verified free of. water.

5.

SUBSEQUENTJ ORRECTIVE ACTION:

The water was drained from the transfer pump suctions, the wall tank drains and the anometer connection for '2A' underground tank.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

A sampling procedure will be developed and a sampling frequency established for the above ground tank.

I 7.

GENERIC IMPLICATIONS:

l None.

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