ML20012D667

LER 90-001-00:on 900223,discovered Controlled Ventilation Area Sys Airlock Doors D-170 & D-171 Open.Caused by Inadequate Administrative Controls.Procedural Instructions Will Be developed.W/900323 Ltr

ML20012D667
Person / Time
Site:	Waterford
Issue date:	03/23/1990
From:	Mcgaha J, Starkey R LOUISIANA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-001, LER-90-1, W3A90-0124, W3A90-124, NUDOCS 9003280213
Download: ML20012D667 (5)

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la March 23, 1990 .;

U.S. Nuclear. Regulatory Commission i ATTENTION: Document Control Desk j Washington, D.C. 20555 l 1

Subject ,Waterford 3 SES .;

Docket No. 50-382 I License No.-NPF-38 i Reporting of Licensee Event Report  !

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Centlemen t j Attached is Licensee Event Report Number LER-90-001-00 for Waterford l Steam Electric Station Unit 3. This Licensee Event Report is' submitted

pursuant to'10CFR50.73(a)(2)(iv).

Very truly yours, ll J.R.:McGaha Plant Manager - Nuclear i: :JRM/KTW/rk (w/ Attachment) r cc s - Messrs. R.D. Martin y J.T. Wheelock - INPO Records Center E.L. Blake- i W.M. Stevenson D.L. Wigginton ,

NRC Resident Inspectors Office

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At a'pproximately 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> on February 23, 1990, Waterford Steam Electric Station Unit 3 was operating at 100% power when engineering personnel discovered L Controlled Ventilation Area System (CVAS) airlock doors D-170 and D-171 open.

The doors were open to extend a service air line into safeguards pump room A i for fire seal repairse With both door 170 and 171 open, the CVAS would have

been unable to fully perform its design safety function of establishing -0.25 l inches water gage (vg) negative pressure in the 60 seconds following a safety l

injection actuation signal (SIAS).

t The root cause of this event is inadequate administrative controls over airlock doors. Insufficient formal controls over airlock doors allowed doors 170 and 171 to be propped open simultaneously. Procedural instructions will be developed to govern the control of air lock doors and prevent recurrence of this event.

Because the CVAS was capable of aligning and initiating filtration of exhaust ventilation this event did not threaten the health and safety of the general public or plant personnel.

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( LICENSEE EVENT REPORT (LER) TEXT C^NTINUATION A*eaoveo ove wo mo-om exeints: awe f* P ACILITY .sAAAt 01 DOCK E T $$UGS4 R 83) gga gevesta it) t&OL (3)

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i At approximately 1330 hour0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br />.s on February 23, 1990 Waterford Steam Electric Station Unit 3 was operating at 100% power when engineering personnel conducting

-a routine system walkdown discovered Controlled Ventilation Area System (CVAS) airlock doors (EIIS Identifier VF-AL-DR) D-170 and D-171 open. With doors 170 and 171 open the CVAS would have been unable to fully perform its design safety function of establishing -0.25 inches water gage (vg) negative pressure in the 60 seconds following a safety injection actuation signal (SIAS) (EIIS Identifier

- JE). This event is reportable as a condition which could have prevented a safety system from performing its design safety function in controlling the release of radioactive material.

The CVAS is designed to provide filtration of exhaust air from the areas of the Reactor Auxiliary Building (RAB) (E1IS Identifier - NF) which contain Emergency Core Cooling System (ECCS) (EIIS Identifier BE-Bp-BO) components f6ilowing a design basis loss of coolant accident (LOCA). Upon actuation of an SIAS, the CVAS functions to evacuate the controlled ventilation area to

-0.25 inches wg within 60 seconds, limiting post accident radiological releases to below 10CFR100 guidelines.

Doors 170 and 171 had been opened to perform minor bolt repairs on each door.

These repairs were authorized by the shift supervisor (SS) via the maintenance supervisor under work authorization (WA) 01049469. Repairs commenced at approximately 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br />, at which time contractor personnel carried an air pump (EIIS, Identifier - p) and the associated service air hose (EIIS Identifier

- LF) through doors 170 and 171. Door 170 is a fire door, security door, and an airlock door. The air pump and hose were needed to complete fire barrier repairs under WA 01051474 and included fire impairment authorization and

' security posting for door 170. Fire impairment 90-054 stated that door 170 was required to be lef t ajar for the passage of air hoses. Door repairs were completed at approximately 1015 hours0.0117 days <br />0.282 hours <br />0.00168 weeks <br />3.862075e-4 months <br /> but both air lock doors remained open to allow air hose passage into safeguards pump room A. At approximately 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> the CVAS system engineer discovered this condition, immediately notified the control room, and initiated action to properly secure both doors. E geoau au .v.s. c w. i.e. oie4ev.coavo

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'All plant airlock doors have attached warning signs which read "D0 NOT BLOCK OPEN OR PROP OPEN THIS DOOR WITHOUT PROPER AUTHORIZATION, AIR LOCK DOOR."

Because authorization to prop open the doors for both repairs was obtained from the SS, the fire seal workers involved did not question the signs after permission had been granted for the door repairs.

Prior to this event, the warning signs were employed as the primary means of administrative controls over air lock doors. Because the warning signs did not ensure positive control over the airlock doors, the root cause of this event is inadequate administrative control over plant airlock doors.

The following corrective actions are planned

1. Procedural instructions will be developed to establish more stringent controls over plant airlock dooru. These instructions will provide requirements to verify that airlock doors which could adversely affect the operation of plant systems important to safety are not improperly propped or held open.

2. Existing door signs will be replaced with signs which reference the governing procedure and specifically direct individuals to contact the SS for permission to prop or hold open an airlock door.

3. _ This event will be reviewed with plant perr.onnel during upcoming safety meetings.

4. Current procedures for other plant doors which are administrative 1y controlled (security doors, firedoors) will be reviewed for adequacy and revised as necessary to ensure positive control over the applicable doors.

The estimated completion date for this corrective action is May 31, 1990.

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.Because both CVAS exhaust fans (EIIS Identifier - FAN) would have started upon initiation of an SIAS and exhaust ventilation would have diverted to the high .

efficiency particulate air.(HEPA) filtered path as designed, this event did not '

threaten the health and safety of the general public or plant personnel, l

SIMILAR EVENTS.

NONE 1-l' PLANT CONTACT R.S. Starkey, Operations Superintendent - 504/464-3134. ,

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