ML20084H716

AO BFAO-7432W:between 740408 & 0514,Unit 2 Turbine Roof Exhaust Not Monitored for Gaseous Release Activity When Exhaust Fans Operated.Caused by Incorrect Assembly of Two Continuous Air Monitors So Sample Bypassed Monitors

ML20084H716
Person / Time
Site:	Browns Ferry
Issue date:	05/24/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084H719	List: ML20084H716 ML20084H720
References
AO-BFAO-7432W, NUDOCS 8305040781
Download: ML20084H716 (3)

Text

.

1. TENNESSEE VAL.L t CHATTANOOGA, TENNESSEE / AUTHO AITY t > t'"31Q 7. /'-

37401 L i/ ..

r 42 O N. gRgO ,4 ..

T.

May 24, 1974 s j h $$[g3

,6- bh h $IhhN i jw

1. g<39to 9 K 7 aC-i j

4 pe Mr. John F. O' Leary, Director 1,

cs. t,{'[frv.1

^ y^

g Directorate of Licensing g > g, g ',

- Office of Regulation ,

g y U.S. Atomic Energy Co::=11ssion Washington, DC 20545 ,

Dear Mr. O' Leary:

TENNESSEE VALTM AUTHORITY - BROWS FERRY NUCLEAR PLANT UNIT 1 -

DOCKET NO. 50-259 - FACILITY OPERATING LICENSE DPR ABNORMAL OCCURRENCE REPORT BFAO-7432W The enclosed report is to provide details concerning failure to monitor gaseous effluent from unit 2 turbine roof exhausts and is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973. This event occurred on Browns Ferry Nuclear Plant unit 1 on Ucy 14, 1974 Very truly yours, TENNESSEE VALLEY AUTHORITY E. F. Thomas Director of Power Production Enclosure CC (Enclosure):

Mr. Normen C. Moseley, Director Region II Regulatory Operations Office, USAEC 230 Peachtree Street, IM. , Suite 818 Atlanta, Georgia 30303 I

8305040781 740524 PDR ADDCK 05000259 S PDR 4757 _ ..,

e ta

. O .

.O r . .. ..  ;

• * ~~

ABNORMAL OCCURREtiCE REPORT Report ITo.: BFAO-7432W Report Date: May 24, 1974 Occurrence Date: Fay 14, 1974 Facility: Browns Ferry I.'uclear Plant unit 1 ,

Identification of Occurrence Failure to monitor gaseous effluent frca unit 2 turbine roof exhausts.

Conditions Prior to Occurrence Unit 1 was in its startup test program and unit 2 was being readied for initial fuel loading. Unit 1 was in the cold shutdown condition at the time of discovery.

Description of Occurrence The turbine roof exhaust on unit 2 is required to be monitored for gaseous release activity when exhaust fans are operated. This monitoring was not done between April 8th and May 14th for an accu =alated operating period of 16-1/2 days. The two continuous air monitors (CAM) in use on unit 2 were found incorrectly assembled, allowing the sa=ple to bypass the radiation monitors (see sketch).

Analysis of Occurrence The two CMi's were installed on January 23, 1974, to allow preoperational testing of the unit 2 turbine roof exhaust fans which were operated for short periods on April 8, April 16 through 23. I0:7 7 through 12, cnd May 14. During this time, the unit 1 turbine roof exhaust fans were not operated. Since the measured unit 1 release rate was t.0.15 percent of the technical specification limit during the time unit 2 turbine roof exhaust fans were operated and since no significant airborne activity occurred in the unit 1 turbine building during periods of fan operation, there is reasonable assurance that the release through unit 2 turbine room roof exhausts did not appreciably change the total site release rate.

Corrective Action All other CMI's of this type were inspected and found correctly assembled. The CAM manufacturer was notified of the problem. Instructions will be revised to verify correct assembly before initial installation and after any CAM modification or repair that may affect the hose assembly.

Failure Data CAM's: 2-RM-90-249 and 2-RM-90-251 Manufacturer: ITuclear Measure =ents Corporation Model: AM-33IF(EF)

, - - -- g,--, - - ~ .,7- , . --

. sn

. .. . . ~ . . . . . . . . . . . . . . .

. . . . .. _ . . A. . . . . . . . .

c.

\ . t

., k . -.. 7. ~.. . . , I...

• .. , I r

... .. . . .. .T..j. ..a . .. .. . i

.,p ,

. . . . . . - ~ - - _ .-

,I l

k . . - .. .

4 I

(} l g . .. , . - . . . . . . . ,  !

w

.. ..p . . . .

r .

4 4

A... .

s

_C . -...}

. . . . .. s . . . to .

. . .k. . . . . . . . g g .,

• N..

.  ;.s - 4 u .t .

. . ... _ 4__

n v 4 c: . ..

. . . . ~ . -

s yC . .

u.

e% v m $ .

ig pc2 . m . . ~ . . .. . .

. y, $ . ~

. q, n

Z

. . . . . . .. s 4 . .

. . 5 .- . .%._..

k  ;

,,. q g]g *.. As s s sssMAQ }_d M-

• F.

a *. A s m s t....a s t Was Ns.N w m s*AA'o.t*

.q y . . . ... . . . . . .

..~... . . . . .. - . . . . . . - . .

z

.. - . . . . . . 9 4

. .. . . . , . . . . . .. . . . i -

or . . ,. . ..y%. .. .i

.I. .3 a m

, y . . . . - . . . ..

2 ,

VV + 1

( pa

.. y

- - g, 9 T t.

- .- - . 4, N, L*

g . .

g,e

. . . . . . . 6 e

...v. i

, _ 3' . .. 6 , . . .  !

.. . . 1A . . . .

g'

.. . .. y 1

. . .. a. .

< 4 9

• , . ... . .. . . . . . s 4

...1 .

g t

7 . . ag . .. .

>h. __ %_ ,e v, . . . . .

4 W g , $, l .. ...L.... .

. . .. . ... . . OA. .. .. . . . . . . . . . ,

W

.y,. .

.f , . x<

= s

!(. y) t./

=

..j g . . .

I . . ~ . . . . . . . . . .

l e

. . . . . . . . . . . I 1

. . e . . . .. . . -.e. . w .m an .

l

. wag .&.y % .' _ ^ ~f Y

,...n--- - -- - - ---

- , , , '. - - - , - - - n... , , , +