05000346/LER-1981-007-03, /03L-0:on 810122,door 306 Found Partially Open,So That Spent Fuel Pool Emergency Ventilation Sys Could Not Have Maintained Area at Correct Pressure.Caused by Maladjusted Door Closure.Maint Work Order Issued

/03L-0:on 810122,door 306 Found Partially Open,So That Spent Fuel Pool Emergency Ventilation Sys Could Not Have Maintained Area at Correct Pressure.Caused by Maladjusted Door Closure.Maint Work Order Issued

ML20003B774
Person / Time
Site:	Davis Besse
Issue date:	02/20/1981
From:	Statz J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20003B771	List: 05000346/LER-1981-007, Forwards LER 81-007/03L-0 05000346/LER-1981-007-03, /03L-0:on 810122,door 306 Found Partially Open,So That Spent Fuel Pool Emergency Ventilation Sys Could Not Have Maintained Area at Correct Pressure.Caused by Maladjusted Door Closure.Maint Work Order Issued
References
LER-81-007-03L, LER-81-7-3L, NUDOCS 8102250474
Download: ML20003B774 (2)

LER-1981-007, /03L-0:on 810122,door 306 Found Partially Open,So That Spent Fuel Pool Emergency Ventilation Sys Could Not Have Maintained Area at Correct Pressure.Caused by Maladjusted Door Closure.Maint Work Order Issued

Event date:
Report date:
3461981007R03 - NRC Website

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~ l o l 2 l l (NP-33-81-06) On 1/22/81 at 0850 hours0.00984 days <br />0.236 hours <br />0.00141 weeks <br />3.23425e-4 months <br /> a station personnel reported that door 306 l

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13 l6 l l statement of T.S. 3.9.1.2 prohibits fuel handling operations and movements of loads l

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40 41 42 43 a.4 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li l o l l The door was irmediately closed and latched. The cause of the finding was a door i

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It was not closinn hard enouch to latch the docr.

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TOLEDO EDISON COMMNY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUDPLEMENTAL INFORMATION COR LER NP-33-81-06 DATE OF EVENT: January 22, 1981 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Spent Fuel Pool Emergency Ventilation System inopera-ble due to unlatched door 306 Conditions Prior to Occurrence: The unit was in Mode 5 with Power (MRT) << 0 and Load (Gross MWE) = 0.

Description of Occurrence: On January 22, 1981 at 0850 hours0.00984 days <br />0.236 hours <br />0.00141 weeks <br />3.23425e-4 months <br />, an Instrument and Con-trols mechanic reported that door 306 (fuel handling area, elevation 585') was not latched. The door closing device did not fully close the door. Since the door opens into the area that'the spent fuel pool energency ventilation system draws from, the door would be. pulled further open when the system started. With the door open, the system would not be able to maintain the storage pool area at a negative pressure of 211/8 inches water gauge relative to_ the outside atmosphere. Technical Specification 3.9.1.2 requires tec independent emergency ventilation systems servicing the storage pool area to be operable whenever irradiated fuel is in the pool. The action state-m:nt prohibits the movement of fuel and crane operation with loads over the storage pool until at least one system is' restored to operable status. These restrictions ware not violated.

Designation of Apparent Cause of Occurrence: The cause of the occurrence was a door closing device which needed adjustment. Idaen -the door was pulled shut by the person that f.ound it ajar, it did latch ano recain closed. Apparently, the door had been opened and then allowed to close itself but the closing device did not latch the door, Analysis of Occurrence:

There was no danger to the health and safety of the public or e

to station personnel. There were not any fuel movements or crane opetations with loads cver the pool during this time. Had the spent fuci pool emergency-ventilation system been needed, it could have been started and would have created a negative pressure in the area even though it would not have been able to reach the 2 1/8 water gauge nega-tive pressure.

Corrective Action

The door was immediately closed and latched. Maintenance Work Order 81-1187-009 was ir. tad the same day to adjust the door closing device.

The door closures will be included on a preventive maintenance program.

Failure Data: There have been no previous incidents caused by a door closure needing cdjustment. Previous reports of doors being blocked open were reported in Licensee Event Reports NP-33-80-56 (80-047) and NP-33-80-79 (80-066).

LER #81-007 w