ML20012C246

LER 90-008-00:on 900209,latching Mechanism for Door Entering Containment Encl Bldg Failed,Rendering Emergency Air Cleanup Sys Inoperable.Plant Cooldown Initiated,Latching Mechanism Repaired & Door Returned to svc.W/900312 Ltr

ML20012C246
Person / Time
Site:	Seabrook
Issue date:	03/12/1990
From:	Belanger R, Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-008, LER-90-8, NYN-90063, NUDOCS 9003200378
Download: ML20012C246 (4)

Text

. _ _ . ___ z GL z

New Hampshire

, Ted C. .m

'[' t

. Senior Vice Preddent and i Chief Operating C6cer  ;

l NYN- 90063 March 12, 1990 l

h United States Nuclear Regulatory Commission i Washington, DC 20555 Attention: Document Control Desk .

References:

Facility Operating License No. NPF-67. Docket No. 50 443 Subjects Licensee Event Report (LER) No.90-008 000: Initiation of Plant '

Shutdown due to Loss of Both Containment Enclosure Emergency Air j Cleanup Systems '

Gentlemen: i Enclosed please find Licensee Event Report (LER) No.90-008 00 for Seabrook Station. This submittal documents an event which was identified on s February 9, 1990, and is being reported pursuant to 10CFR50.73(a)(2)(1).

Should you require further information regarding this matter, please '

' contact Mr. Richerd R. Belanger at (603) 474-9521, extension 4048.

Sincerely yours, gff, / J+* b " '

Ted C. Feigenbaum Enclosures NRC Forms 366, 366A '

i 9003200370 900312 PDR S

ADOCK 05000443 PDC

[fifsll\ k New Hampshire Yankee Division of Public Service Company of New Hampshire P.O. Box 300

• Seabrook, NH 03874

• Telephone (603) 474 9521

c -,

. w

.= .

!^

. United States Nuclear Regulatory Commission Phrch 12, 1990

' Attention: Document Control Desk Page two e

cc Mr. William T. Run.cIl Regional Administrator United States Nuclear Regulatory Commission

-Region I 475 Allendale Road King of Prussia, PA 19406 Mr. Victor Herses, Project Manager-Project Directorate I-3 United States Nuclear Regulatory Commission Division of Reactor Projects Washington, DC 20555 Mr. Noel Dudley NRC Senior Resident Inspector P.O. Box 1149 Seabrook, NH 03874 INPO Records Center 1100 Circle 75 Parkway Atlanta, GA 30339

\

I-.

L

Nat s e'sa 306 U.S. NUCLLh LECULAT0kY COMul5460N tt 431

• APPZVf D OMB (*0. 3%8108

• 5 5 55 *"3 LICENSEE EVENT REPORT (LER)

F AC,LITY hAME (1) 00CEti NUMBER L24 I A0 0 '38 Scabrook Station o l5 l 0 l0 l 0 l 414 ]3 1lorl0 l 2 Initiation of Plant Shutdown due to Loss of Both Containment Enclosure Emergency Air Cleanup Systems tVINT DAf t (Si Lt A NUMtt R 16) REPORT Datt (71 OTHE R 5 ACILITIES INVOLVID Ill MONTM OAY YEAR Y(AR 5t q

Ak gggyg ( DAY Y[ ASL f ACiklTV h AMt3 OUCKEY NUM96Ri$1 015101010 1 1 1 0:2 Oi9 9 0 9 i0 -

0:0 18 -

01 0 0:3 1 :2 910 l I I I I I I I I 0 15 0:0,0, i 1

,,,,,,,, TNis atP0a7 is sututTito PUnsuANT To TMt atovlatMINT: OP 10 CF R 0 (Ca.ee . ., .., ,,*, i ii...si ou MODE tel 4 30.402 tti 20 a0$lel 60 736el(25tivl 73.71161 a 20,40$lett1HI) 50.36tsH18 60 73telttilet 73.? Ital n o, i p .0 0.ieln.

.02.ieH ,

.0n.,qi.ii, g=,.,g,g,y, 20 4061sl0Heill 60,73te H2H4) 50.731elttilv6411tAl J66Al 20 405te H1Hwl lo.731eH2 0 lie) 60.73leH2Hvelitt to 40$leH1Hel 60.73te H2His61 60.73teit2Hal LICENst t CONT ACT FOR TMit Lth 03 NAM ( TE LtPMONE NVVSER Richard R. Belanger, Lead Engineer - Compliance - Extension 4048 6 i 03 1 4;7 i 4 i i 95I i 2; 1 COMPLif t ONt LINI FOR R ACH COMPONENT F AILUPt DESCmittD IN THis atPORT H31 CAvst 5YSTiv COMv0NENT

• • % ^C' "$[g",'n'fs t CAU58 S Y ST E W COM*CNI NT "'"[g AC. n RiA E pn I I i 1 I I I I I 1 I I I i 1 1 l ! l 1 l 1 I I I I I l

$UPPLEMENT AL REPORT EXPECTED ti4l MONT M CAY YtAR SUBMf 5510N YES lit ee.

V se porte KK!ECTIO Sv06,*$$ TON DMil No l l l a:T a AC T iv,,,,, ,, , -, , . . .,m ..-...,v ,,, ... sy. -,, ,v,..,,n. A~o o s i On February 9,1990, at 8:47 am EST, the latching mechanism for a door entering the Containment Enclosure Building failed, rendering the Containment Enclosure Emergency Air Cleanup System incapable of producing the negative pressure required by Surveillance Requirement 4.6.5.lb.2d.4.

Therefore both trains of the Containment Enclosure Emergency Air Cleanup e

System were determined to be inoperable and a plant cooldown was initiated at 9:00 am.

The latching mechanism for the door was repaired and the door was returned to service at 9:26 am, restoring compliance with Technical Specification l 3.6.5.1. .

The root cause of the noncompliance with Technical Specifications is the failure of the door latching mechanism. This door opens into the Enclosure l l Building from the Main Steam and Feedwater West Pipe Chase, therefore the l l differential pressure between these areas creates an opening force on the i door. This force, combined with normal wear, resulted in the failure of the latching mechanism.

l There were no adverse safety consequences as a result of this event. The l inoperability of the Containment Enclosure Air Cleanup Systems did not adversely affect the health and safety of the public or onsite personnel.

l l

ung.... n.  !

. . , i

(

• ui =vetin mu6 aron, co wwo=

.e..

• • ' **eaovie ous =o mo-eio.

LICENSEE EVENT REPORT (LER) TEXT CONTINUATION

- uriaisne DDChef wuwtta un gga ayugga 43 pagggy f acettiv haul t.l

,gge 6,0ws % t in g ; myoc=

Scabrook Station j o p to lo lo l4 l 4l3 9]0 --

010l8 --

0l0 0] 2 or 0l2 rsxw . .=ac s mumi 9

On February 9, 1990, at 8:47 am EST, the latching mechanism for a door entering the Containment Enclosure Building failed, rendering the door i incapable of being maintained closed. With this door inoperable, the Containment Enclosure Emergency Air Cleanup System was not capable of producing a negative pressure of greater than or equal to 0.25 inch water gauge within the containment enclosure annulus as required by Surveillance Requirement 4.6.5.lb.2d.4. Therefore, both trains of the Containment Enclosure Emergency Air Cleanup System were determined to be inoperable.

Seabrook Station Technical Specification 3.6.5.1 requires that two Containment Enclosure Emergency Air Cleanup Systems be OPERABLE in MODES 1, 2, 3 and 4. The ACTION associated with this specification does not address the condition of both systems being inoperable, therefore, a plant cooldown in accordance with the requirements of Technical Specification 3.0.3 was initiated at 9:00 am.

CORRECTIVE ACTION The latching mechanism for the door was repaired and the door was returned to service at 9:26 am, restoring compliance with Technical Specification 3.6.5.1. The plant :ooldown was terminated at this time. Revisions to Technical Specification 3.6.5.1 to provide an ACTION requirement addressing the inoperability of two Containment Enclosure Emergency Air Cleanup Systems due to the lack of enclosure building integrity are being evaluated.

l4)2T CAUSE The root cause of the noncompliance with Technical Specifications is the faliure of the door latchJr.g mechanism. This door opens into the Enclosure l

Building from the Hain Stiam and Feedwater West Pipe Chase, therefore the differential pressure between these areas creates an opening force on the door. This force, combined with normal wear, resulted in the failure of the latching mechanism.

! SAFETY CONSEOUENCES There were no adverse safety consequences as a result of this event. The i

Containment Enclosure Emergency Air Cleanup Systems function to ensure that, t

during LOCA conditions, leakage into the annulus is filtered through HEPA l filters and charcoal adsorbers prior to release to ensure that site boundary radiation doses remain with the limits of 10 CFR 100. At the time of this event, the unit had been shutdown since June 22, 1989, following a total of 19.2 effective full power minutes of operation. Therefore, the inoperability of the Containment Enclosure Emergency Air Cleanup Systems did not adversely affect the health and safety of the public or onsite personnel.

This is the first event of this type at Seabroo.h Station.

At the time of this event, Seabrook Station was in MODE 4 with the Reactor Coolant System (AB) at 333 degrees Fahrenheit and pressurized to 925 psig.

aac 'o*" * .u s e.co ie un swEs N Ml