ML20012B485

LER 83-039/03X-2:on 830726,discovered That Handwheel for Inner Door of Personnel Airlock in Shut Position & Partially Opened.Caused by Excessive Use of Door During Outages.Door Repaired & Returned to Operable status.W/900306 Ltr

ML20012B485
Person / Time
Site:	Davis Besse, Farley
Issue date:	03/06/1990
From:	Storz L, Stotz J TOLEDO EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-83-039-03X, LER-83-39-3X, YM33-83-045, YM33-83-45, NUDOCS 9003150080
Download: ML20012B485 (3)

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EDISON PLAZA e

300 MADISON AVENUE -

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Log No.: BB90-00144 NP33-83-045, Rev 2 L

Docket No. 50-346 License No'.NPF-3 r

i b United States Nuclear Regulatory Commission Document Control Desk Vashington, D. C. 20555 Gentlemen:

LER 83-039, Revision 2 Davis-Desse Nuclear Power Station, Unit No. 1 '

Date of Occurrence - July 26, 1983 Enclosed please find revision 2 to Licensee Event Report 83-039. This revision eliminated FCR 85-0178 as an intended corrective action. The revisions are indicated by a revision-bar in the left-hand margin. Please discard or. mark superseded any previous copies of this LER.

Yours truly ,

l @ *Q r Louis F. Storz Plant Manager Davis-Besse~ Nuclear Pover Station LFS/plf' Enclosure cc: Mr. A. Bert Davis Regional Administrator USNRC Region III Hr. Paul Byron DB-1 NRC Sr. Resident Inspector l'@

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b LICENSEE EVENT REPORT H -3 C)NTROL BLOCK: l - l

-1 l l l l lh-6 (PLEASE PRINT CR TYPE ALL REEUIRED INFORMATION)

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0 l H l LICENSEE D l BCODE l S l 114l@l16 0 lo l lo lo lo l Ol ol -l 0l 0 l@l LICENSE NUMBER 26 426l 1 LICENSE l 1 l 1TYPE l 1JOl@l67 l CAT l 68 @

CON'T lTITI 3[n] l L l@l 0 l 5 l 0DOCK l 0ETl0NUMBER l 3l 4 l 6 l@l 68 0 l 7 EVENT l 2 l DATE 6 l 8 l 374l@l7b0 l 3REPORT l 0 lDATE6l 9 l 080 l@ ,

' ?- 8 60 61 69 i EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h L 0 2 l (NP-33-83-45) on 7/26/83 at 0710 hours0.00822 days <br />0.197 hours <br />0.00117 weeks <br />2.70155e-4 months <br />, two personnel were exiting the containment I g l-building by way of'the personnel hatch. While in the tunnel, it was discovered l' i o i4 g' l that with the hand whcc1 for the inner door in the shut position, the inner door l go,3p[ was partially open. The hatch was declared inoperable, invoking the criteria of l 1016 l l Technical Specification 3.6.1.3. There was no danger to the health and safety of l

. ya;7i ; the public or station personnel. The outer door was verified shut with the l

- , , , , , g exception of the exiting of the two personnel involved. l 80 7 89 DE CODE S 8C E COMPONENT CODE SU8 CODE 5 E 1019I 7 8 1 z l z l@ in_J@ Lz_1@ I P l r I N It IT in l@ W@ W @

9 10 11 12 13 18 19 20

,,, SE QUE NTI AL OCCURRENCE REPORT REVISION LE R/RO EVENT YE AR REPORT NO. CODE TYPE NO.

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[---J l2l 32 21 22 23 24 26 27 28 29 al KEN AC O L NT HOURS 22 #$B$1T S N FOR$1 B. SUPPLih MANUF CTURER

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33 lJ6Zl@ 31 40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTION 3 h

-11 l 0 l l The cause was excessive use during outages which caused excessive wear. With this l gil3l l wear, it can rebound open while the latching mechanism continues to close. Under l

,,,,,; MWO 83-4009, the personnel lock was returned to operable. During the 1984 Refueling l g g 3, y Outage, a thorough inspection was conducted by the vendor. Under MWO 1-84-2947-01, l the noted problems were corrected.  ;

, ,, g 7 8 9 80 ST S  % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION I115 l lD l@ l 0 l 0 l 0 l@l N/A l lAl@l-Operatorobservation l A TIVITY CO TENT 5

RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE I1 l6' l'[7d h l 'Z l@l N/A l [ N/A l PERSONNE$ EXPOS ES NUMBER TYPE DESCRIPTION l1 l 7 l l0 l0 l0 l@lZ l@] N/A l PE RSONN E L INJU IES NUMBER DESCRIPTION l

It IR8 I9lo 10 l0 l@l12 N/A 7 11 80 LOSS OF OR DAMAGE TO FACILITY l 3 l 9 l lYlgl N7I l 7 8 9 10 80 ISSUE l N/A D_[OJ [z_j@ DESCRIPTION I 68 69 llllIIlIIllllI 80 5

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, Jan C. Stotz (419) 321-7544

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TOLEDO EDISON COMPANY

[ DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO. 1 F SUPPLEMENTAL INFORMATION FOR'LER'NP-33-83-45, REVISION 2

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p DATE OF EVENT: July 26,- 1983 FACILITY ' Davis-Besse, Unit No. 1 IDENTIFICATION OF OCCURRENCE: The Unit was in Mode 3, with Power (MVt) = 0 and Load (Gross MVe) = 0 conditions Prior to occurrence: At 0710 hours0.00822 days <br />0.197 hours <br />0.00117 weeks <br />2.70155e-4 months <br /> on July 26, 1983, two personnel

% vere exiting the_ containment building by vay of the personnel hatch. While in the tunnel, it was found that the hand wheel for the inner door was all the way in the shut position while the inner door was still partially _open. The

' outer door.vould open and both personnel exited the personnel hatch tunnel and reshut the outer door. The Shift Supervisor declared the personnel hatch inoperable, and the Unit entered the action statement of Technical Specification 3.6.1.3. ,

i Designation of Apparent Cause of Occurrence .The cause was excessive use  !

which caused wear of the roller cam bearings. Vith this vear, the door can rebound open while the latching mechanism continues to close. In late May-1983, the personnel hatch manufacturer, Chicago Bridge and Iron, advised Toledo Edison that this is a potential malfunction for their air locks fabricated and installed between 1464 and 1973.- During the 1984 Refueling Outage, the vendor representative inspected the lock and suggested modifications to strengthen areas to reduce wear on the bearings..

Analysis of Occurrences i i

There was'no danger to the health and safety of the public or station  !

personnel. The plant was in Mode 3 in the process of shutting down.for the {

1983 Refueling Outage. The outer door was verified shut with the exception of -!

the exiting of the two personnel involved. j 1

Corrective Action: j j

Under MVO 83-4009, the personnel lock was repaired and returned to operable  !

status. A more indepth preventive maintenance program (PM-0745) has been l implemented. j-During the 1984 Refueling Outage, some suggested refurbishments by Chicago  !

Bridge and Iron (CB&I) vere implemented under MVO 1-84-2947-01. Additional  !

' modifications were considered for implementation during subsequent outages.  !

However, due to the very successful use of temporary doors in the personnel--  !

hatch during outages, vear and tear on the permanent doors has been .

significantly reduced. Therefore, no additional modifications vill be made.  !

Failure Date Previous similar occurrences involving containment personnel  !

air lock door failing to latch were reported in Licensee Event Reports NP-33-77-18 (77-018), NP-33-80-92 (80-073), and NP-33-81-80 (81-167).

LER No.83-039 1, i