ML20052E876

LER 82-016/03X-1:on 820312,door 108 Found W/Both Door Closure Mechanisms Broken.Caused by Improper Operation of Door Closure Mechanisms by Personnel.Mechanisms Temporarily Repaired & New Parts Ordered

ML20052E876
Person / Time
Site:	Davis Besse
Issue date:	04/29/1982
From:	TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052E874	List: ML20052E872 ML20052E876
References
LER-82-016-03X, LER-82-16-3X, NUDOCS 8205110497
Download: ML20052E876 (2)

Text

NRf: FORMJ)66 , U. S. NUCLEAR REGULATORY COMMISSION (7 77)

• ;- LICENSEE EVENT REIORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 lo l1]8 9l 0 l11 l D l B l S14 l 1 l@l 0 l0 l- LICENSE 15 l 0 l0NUVBER l0 l0 l0 l- l0 [0 25 l@l 26 4ILICENSE 1l ll TYPE 1l 1l@l JO l

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7 8 61 NUMBFa EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 121 l (NP-33-82-17) On 3/12/82 at 1155 hours0.0134 days <br />0.321 hours <br />0.00191 weeks <br />4.394775e-4 months <br /> Door 108 was found . 'th both door closure mech-l lo lal l anisms broken. These mechanisms are turned after the door is shut to form a water- l

[o la l l tight seal. T.S. 3.6.5.2 requires this door to be functional for shield building in- I lo lsl ltegrity in Modes 1, 2, 3, and 4. The plant started a shutdown for a planned refueling l lo oj joutage and was in Mode 5 at 0710 hours0.00822 days <br />0.197 hours <br />0.00117 weeks <br />2.70155e-4 months <br /> on 3/14/82 which met the action statement re- l l o l 7 l I quirements. There was no danger to the public or station personnel. The door would l io,g; ;still close and provide some protection against flooding. l SYSTEY CAUSE CAUSE COYP. VALVE CODE CODE SUSCOOE COVPONENT CODE SUSCODE SUBCODE l0l9]

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1 i l o j lThe cause was improper operation of the door closure mechanisms. Apparently personnel l Ii li j l attempted to push the door open with the door closure mechanisms closed and eventually I g,;7glthe mechanisms broke. The mechanisms were temporarily repaired and new parts were 1 i,i3; l ordered. The parts will be installed when received. Signs will be placed on both l

[1 jai l sides of the door with instructions on the proper operation of the mechanisms. 80 I

7 8 9 oTHE R STATUS iSCO RY DISCOVERY DESCR;PTioN STA S  % POWER NA l lAl@l Operator Observation l

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-TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-82-17 DATE OF GCCURRENCE: -March 12, 1982 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Door.108, the access door from the #2 Emergency Core Cooling System (ECCS) Pump Room 115 to the. Detergent Waste Drain Tank (DWDT) and Pump Room.125 could not be scaled i

Conditions Prior to Occurrence: The unit was in Mode 1 with Power (MWT) = 1885 '

and Load (Gross MWE) = 610 Description of Occurrence: On March 12, 1982, at 1155 hours0.0134 days <br />0.321 hours <br />0.00191 weeks <br />4.394775e-4 months <br />, Door 108 was found to have both latching door closure mechanisms broken. These mechanisms are turned when the door is closed to create a watertight seal on the door. Technical Specification 3.6.5.2 requires.this door to be functional as part of shield building integrity.

The action statement requires integrity be restored within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least hot standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. The plant was reducing power for a planned refueling outage. .The plant was in Mode'3 (Hot Shutdown) at 0438 hours0.00507 days <br />0.122 hours <br />7.242063e-4 weeks <br />1.66659e-4 months <br /> on March 13, 1982, and then in Mode 5 (Cold Shutdown) at 0710 hours0.00822 days <br />0.197 hours <br />0.00117 weeks <br />2.70155e-4 months <br /> on March 14, 1982. The action statement was met.

Designation of Apparent Cause of Occurrence: The cause of the door mechanism fail-

- ure was improper opening. Apparently, perronnel pushed against the door without having both door closure mechanisms in the open position. Eventually, the mechan-isms broke off.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. Even without the door closure mechanisms, the door would close and slow down any flooding into the ECCS Pump Room 115.

Corrective Action: The door mechanisms were temporarily fixed and new parts ordered.

The new parts will be installed when received. A precautionary sign will be placed on both sides of the door reminding personnel to open both door closure mechanisms before attempting to open the door.

Failure Data: Previous similar occurrences were reported in NP-33-81-06 (81-007),

1 NP-33-81-47 (81-042), NP-33-81-67 (81-055), NP-33-81-91 (81-076) and NP-33-82-04 (82-003).

LER #82-016