05000327/LER-1980-184-01, /01T-0:on 801120,in Mode 1,at 94% Power,Auxiliary Bldg Gas Treatment Sys Was Declared Inoperable.Caused by Nitrogen Supply Line Being Run Under Railroad Door to Cask Loading Area,Preventing Door from Completely Closing

/01T-0:on 801120,in Mode 1,at 94% Power,Auxiliary Bldg Gas Treatment Sys Was Declared Inoperable.Caused by Nitrogen Supply Line Being Run Under Railroad Door to Cask Loading Area,Preventing Door from Completely Closing

ML19345D135
Person / Time
Site:	Sequoyah
Issue date:	12/02/1980
From:	Cottle W, Kirk G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345D134	List: 05000327/LER-1980-184, Forwards LER 80-184/01T-0 05000327/LER-1980-184-01, /01T-0:on 801120,in Mode 1,at 94% Power,Auxiliary Bldg Gas Treatment Sys Was Declared Inoperable.Caused by Nitrogen Supply Line Being Run Under Railroad Door to Cask Loading Area,Preventing Door from Completely Closing
References
LER-80-184-01T, LER-80-184-1T, NUDOCS 8012090358
Download: ML19345D135 (2)

LER-1980-184, /01T-0:on 801120,in Mode 1,at 94% Power,Auxiliary Bldg Gas Treatment Sys Was Declared Inoperable.Caused by Nitrogen Supply Line Being Run Under Railroad Door to Cask Loading Area,Preventing Door from Completely Closing

Event date:
Report date:
3271980184R01 - NRC Website

text

.

. (O

+

v At ell t-LICENSEE EVENT REPORT CONTROL OLOCK: l l

l

}

l l

lh (PLE ASE PRINT OR TYPE ALL nEQUIRED er!FORMATIONI i

e lo l l l Tl Nl S l Nl Pl 1 l@l 0 [0 l-l0 l0 l0 l0 l0 l-l0 l 0 l@l 4 l 1 l1 l 1 l 1 ]@_ l jg 7

8 9 LICENSEE CooE IO 35 LICENSE NUMSER 2b 26 LILENst TVPE 40

$7 G 4 4 M.

CON'T lolil 5[,,

gl 0l 5 l0 } 0 l0 l3 l2 l7 @l 1l 1l 2 l 0 l 8 l 0 @[1 l2 10 !2 l8 10 l@

af l'

8 60 61 DoCKE T NJYDEM M

69 EVENT oATE 34 iS A4PQRf Da.e, 33 EVENT DESCntPTION AND PROSA8LE CONSEQUENCES h

o ;2l l Unit 1 in made 1 at 49% reactor power. The auxiliary building gas treatment

,o;3, ; system (ABGTS) was' declared inoperable at 0930 CST due to a nitrogen supply line g

g o,,,, l being run under the railroad door to the cask loading area preventing the door from l

og3; l completely closing. The ABGTS was again declared inoperable at 2315 CST due to l

[o g ; l uuum relief damper, 0-FCO-30-149, failing open. LCO 3.7.8.1 was entered on both g

gaj,jl occasions. There was no effect upon public health or safety. Previous occurrences-l l o is i l "

"G-I es so sYstEu CAust CAust Covp.

vatyt CcoE Coct '

susCcot Co *oNE47Ccot suetcCE sueCc:E lo691

- l Sl Cl@ W@ l3 l@ l Z l 3 l Z l 3 l 3 l3 l@ l 3l@ '[ 3 l@

9 10 11 12 13 18 19 20 8

t SE OutN YI AL CCCunaENCE REFORT REV17eN 4

. EVENT YE AR R EPOn T No.

4CDE TYPE No.

garon

@,a(y,g 18 10 I l-1 I 11 31 '.l M

10 11 I IT l g

g

_2, n

n 24 2

n n

n n

2 n

$ pate E i

Et A T Cr o PLANT T

HoV33s s8 et t Foni a.

MAN s ACTu Esa Ix l@l 31@

131@

is l@

10 1010101 Irl@

l N l@

lL l@

l3 l9 l9l9l JJ Ja JS 26 37 40 4t 42 43 44 47 CAUSE DESCntPTION AND COAAECitVE ACTIONS h IiloII The nitrocen line was removed from 'mder the railrcad door at 0452 CST.

The

)

I i l i i ! drner un re aired within the time limit of the TCO.

The entire aux 111arv buildine i

l i l 2 I l secondarv containment enclosure was subseauentiv inspected and no additional I i 13 J l tinauthorized nenetrations were found.

11 ief(

8 E 9 80

1. ^*Eti eY 01HEnsTATus h,

$isNel sr

%eowta otsCoVERY otsCRIPTION I1i$I W @ loI4I9l@l NA l

IA l@l Encineer observation AC ytvi ty Cor TENT

$4f Lf a%ED Or nELE Ats!

AuouNT oF ACTIVITY LOCAf ton oF RELEAst l i 16 I L.g_l @ Lal@l NA I

I NA i

1 io 44 4,

s.

FEnsoNNEL ExPCsunEs 1

Nu9e E n TYPE DEsCaspisoq J l i I r i l o I o 10 l@l ZI@l Nt

,E so NE!',N,..'4Es otsCniefioN@

Nuvet a li js t 101 o lo l@l NA I

. 2 so toss or on cauAct TO FACILITY Tv'E D E sClit* TION d, - [,3_j@l NA-l e s to 90 o'EsCRip tion h N A C US E ON L.

i.; set l J j e,j [,3,,j l

n l

llll lll111 ll l 1

7-a s to se -se Name of Preparer W. f. Cottle/G. B. Kirk _

Phone ( A1 'a 8!.2-8317 801209035F

i

/

Tennessee Valley Authority Sequovah Nuclear Plant i

LER SUPPLEMENTAL INFORMATION SORO-50-327/80184 Technical Specification Involved:

3.7.8.1 Reported r:nder Technical Specification:

6.9.1.12.b Date of Occurrence: 11/20/80 Time of Occurrence: 0930 CST Identification and Description of Occurrence:

The auxiliary building gas treatment system (ALGTS) was declared inoperable due to a nitrogen supply line being run under the railroad door to the cask loading area preventing the door from completely closing.

It was unknown whether or not the ABGTS would maintain the required k" H 0 vacuum under this 3

condition.

~

During subsequent testing of the ABGTS at 2315 CST, vacuum relief damper, 0-FCo-30-149, failed in the open position. The ABGTS was again delcared inoperable sic.ce the k" H 0 vacuum could not be maintained.

3 Conditions Prior to Occurrence:

Mode 1 with reactor power at 49%.

Apparent Cause of Occurrence:

The nitrogen line having to be run under the railroad door was a recoenized con-dition.

Investigation discovered that this condition had not been tested during either preoperational or surveillance testing to verify the ABGTS would maintain the required k" H 0 vacuum with the line running under the railroad door.

3 The vacuum relief damper failed due to a faulty flow control operator.

Corrective Action

The nitrogen line was removed from under the railroad door at 0952 CST and the door closed completely. The ABGTS was later tested with the pipe reinstalled under the railroad door to establish if the required k" H,0 vacuum could be naintained under this condition. During the test the vacuum relief damper failed apen and was repaired within Technical Specification tine limits.

Af ter the damper was repaired the ABGTS was tested with the pipe run under the railroad door and the k

H O vacuum could not be maintained at the required 2

system flow rates specified in the surveillance requirements. The pipe was removed and the door closed. The A3GTS was retested and the k" H;0 vacuum was maintained.

_ Failure Da a:

N/A