05000327/LER-1981-077-03, /03L-0:on 810628,refueling Water Storage Tank Was Found to Have Approx 45,000 Gallons Less than Required 370,000 Gallon Vol.Caused by Valve 1-62-500 Being Left Open from Earlier Boron Concentration Equalization Process

/03L-0:on 810628,refueling Water Storage Tank Was Found to Have Approx 45,000 Gallons Less than Required 370,000 Gallon Vol.Caused by Valve 1-62-500 Being Left Open from Earlier Boron Concentration Equalization Process

ML20009G376
Person / Time
Site:	Sequoyah
Issue date:	07/24/1981
From:	Harding M, Kirk G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G373	List: 05000327/LER-1981-077, Forwards LER 81-077/03L-0 05000327/LER-1981-077-03, /03L-0:on 810628,refueling Water Storage Tank Was Found to Have Approx 45,000 Gallons Less than Required 370,000 Gallon Vol.Caused by Valve 1-62-500 Being Left Open from Earlier Boron Concentration Equalization Process
References
LER-81-077-03L, LER-81-77-3L, NUDOCS 8108040186
Download: ML20009G376 (2)

LER-1981-077, /03L-0:on 810628,refueling Water Storage Tank Was Found to Have Approx 45,000 Gallons Less than Required 370,000 Gallon Vol.Caused by Valve 1-62-500 Being Left Open from Earlier Boron Concentration Equalization Process

Event date:
Report date:
3271981077R03 - NRC Website

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3i2j l 3ia1 l Thi:. event required entry into LCO 3.1.2.6 and 3.5.5.

There was no effect upon 3 3; j public health or s5fety. Previous Occurrences - 2 (Reference SQRO-30-327/80070 and 3,,; ; t 80115)

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Valve 1-62-500 had been left open f-ii2l l an earlier unit 1 boron concentration equalization recire process which allowed the RWP iiaii pump to pump water from the unit 1 RWST. The RWST level has restored within. 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />.

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LER SUPPLEMENTAL INFORMAIION SQRO-50-327/81077 Technical Specification Involved:

3.1.2.6 and 3.5.5 Reported Under Technical Specification:

6.9.1.13.b Date of Occurrence:

6-28-81 Time of Occurrence: 0400 CDT Identification and Description of Occurrence:

i The refueling water storage tank was discovered to contain 45,000 gallons less than the required volume of 370,000 gallons. This event required entry into LCO 3.1.2.6 and 3.5.5.

Conditions Prior to Occurrence:

Unit 1 in mode 1 at 30% RTP.

Apparent Cause 6f Occurrence:

Refiteling water purification (RWP) pump had been previously used to recire to unit 1 RNST for boron concentration equalization. Valve 1-62-500 was left open following this operation.

Analysis of Occurrence:

Unit 2 reactor cavity was lined up to pump cavity water to the spent fuel pit, but with valve 1-62-500 open the RWP pump pumped approximately 45,000 gallons of borated water out of the Unit 1 RWST into the spent fuel pit.

Corrective Action

Upon discovery of low RWST level the RWP pump was stopped and valve 1-62-500 was closed.- nit 1 RWST was refilled to 375,000 gallons and verified to have a boron concentration of 2025 ppm.

Operating instructions will be' revised to add position verification of valves 1-62-500 and 2-62-500 for future operations of this type.

Failure Data:

None m " mm fW **