05000373/LER-1982-169-03, /03L-0:on 821201,suppression Pool Narrow Range Sightglass Isolation Valves 1CM039-1CM045 Found Locked Open. Caused by Communication Breakdown Between Unit Nso & Equipment Attendant.Valves Realigned

/03L-0:on 821201,suppression Pool Narrow Range Sightglass Isolation Valves 1CM039-1CM045 Found Locked Open. Caused by Communication Breakdown Between Unit Nso & Equipment Attendant.Valves Realigned

ML20028C154
Person / Time
Site:	LaSalle
Issue date:	12/30/1982
From:	Pulak B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028C142	List: 05000373/LER-1982-169, Forwards LER 82-169/03L-0 05000373/LER-1982-169-03, /03L-0:on 821201,suppression Pool Narrow Range Sightglass Isolation Valves 1CM039-1CM045 Found Locked Open. Caused by Communication Breakdown Between Unit Nso & Equipment Attendant.Valves Realigned
References
LER-82-169-03L, LER-82-169-3L, NUDOCS 8301070123
Download: ML20028C154 (2)

LER-1982-169, /03L-0:on 821201,suppression Pool Narrow Range Sightglass Isolation Valves 1CM039-1CM045 Found Locked Open. Caused by Communication Breakdown Between Unit Nso & Equipment Attendant.Valves Realigned

Event date:
Report date:
3731982169R03 - NRC Website

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60 61 CoCKET NJe8 ER 68 69 EVENT CATE 74 75 REPORT DATE 80 EVENT DESCRIPTICN AND PROSABLE CONSEQUENCU h Supp pool narrow range sightglass n olation valves 1CM039 through 1CM045 were found y

,,;;j locked open when these valves are required to be locked closed per LAP 240-1.

No significant airborne activity existed during the time that tlfesightglasseswere f-valveu in, and the sightglasses have demonstrated their ability to withstand contain-i5II I

ment design pressure during ILRT, so no danger to public was present.

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40 41 41 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Tia; j Apparent corcmunication breakdown between unit NSO and equipment attendant prevented g

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LER NUMBER:

82-169/03L-0 II.

L'.SALLE COUNTY STATION: Unit 1 III. DOCKET NUMBER: 050-373 IV.

EVENT DESCRIPTION

On 12/1/82 the suppression pool narrow range level'sightglass isolation valves 1CM039-45 were found in the locked open position by a shift engineer.

These valves are required to be maintained in the locked closed position per LAP 240-1.

The sightglasses had been valved in on 11/24/82 in order to check a questionable control room indication, and the equipment attendant performing the icvel reading left the valves in the locked open position according to his interpretation of instructions given by the unit NSO.

V.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

Since there was no significant amount of airborne activity in the primary containment during the time that the sightglasses were valved in and the unit was at power operation and since the sightglasses have demonstrated the ability to withstand the containment's peak accident pressure during the Unit 1 ILRT, the health and safety of the public was not affected as a result of this event.

VI.

CAUSE

The cause of this event is an apparent communication failure between the unit NSO and the equipment attendant performing the valving. The EA claims to have been instructed by the unit NSO to leave the sight-glass isolation valves open, while the NSO does not recall giving those instructions.

There exists no documentation to verify either case.

VII.

CORRECTIVE ACTION

Valves 1CM039 through ICM045 were immediately returned to the locked closed position on 12/1/82. Results of a pro investigation conducted by station management is being reviewed by shift personnel in tailgate training sessions (AIR 1-82-592).

In addition, an operating procedure is being drafted to provide a means of verification and documentation of final position of locked valves following temporary position changes (AIR 1-82-593).

Prepared by:

B. Pulak