ML19256A674

LER 78-066/03L-0 on 781208:during Surveillance Procedure SP-345,low Flow & Imbalance Fan Loads Were Experienced Due to Unknown Cause

ML19256A674
Person / Time
Site:	Crystal River
Issue date:	12/29/1978
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256A673	List: ML19256A672 ML19256A674
References
LER-78-066-03L, LER-78-66-3L, NUDOCS 7901090187
Download: ML19256A674 (2)

Text

.

NaC PonM 364 U. S. NUCLE Aa REGULATOav COMMISSION

• am LICENSEE EVENT REPORT EXHlBIT A

! coNract stoco l l l l I i tet: Ass raiNT on Tves Att accuinto iNeoRMATioNi

. .l@

• I

[UT] l F i Ll q Rj Pl 3 lgl 0 l 01- l 010l 0 ; 0l 0 ; ;0 ; 0 .* lgl:.4 l 1; 1l1 l 1 lgj> >_] _;g

-- r $4

, . . va % u Coot i. n uca% e~ veia uuus r e .a

\ CON-T o i

, s M.ol0[ 5l01ooc.it si -10tsvu. 3l0l2l@l11210l817l w u av e=r o.re 81@l a1121219 re an car o*,e I 71 .a al@

sveNT otscairrioN ANo emos Aats coNstoutNets @

[TTTII At 1430, while performinr Surveillance Proced' ire 9P-345. Ativi l f , r" a n i l d i n <j o i Ventilation Exhaust System Monthlv Test, low flow ard imbalance fan loads ,

o . I were experienced. This is contrary to Tech Spec. 3.7.8.1. Ope rab il i ty I o 3 was restored within two hours. No effects upon public health and safety a1 o , i negative pressure was maintained in the Auxiliary Building and a redundanti o ,  ; system was available and operable. Six previous occurrences reported, 1 iTA t first reported event of this type. l

, eo "

5YST E M CAuSE C.65E Cove vatst C004 COCE $VSC005 CQvPONENT CCDE $LSCCCE SLeCCCE t,s.me LiiJ@ LEJ@ L3_lO L IJ' M of W I El M8 LlJ@

9 'O tt 12 is Id LZJ @ JJ SE CL E Nin AL OCCya.gsca ageoey es.esios Ev5Nfvfem REPCaf40 C00g rv eg so Lt * *O

@ s,Eg;a 718 [_-j l0 16l 61

.s y

v l 0131

s y [J W

_v u u 2 i, sa 2,  :;

at4 4 TO ON PLA%f *7 3 *OuAS 22 50 8 3 FC# a S SL L tm va sa agm "

t;J@L.Z.J@

u L,2J@

L,.IJ@ vl ol d ni of L.,xJ @ L.,.sj@ L.t,J@ l i I 1 I 21 1@ .,

cAuse otscaintioN ANaconnecrive Actioss @

, o lThe cause of this event cannot be determined,an normal operation and air g l flow returned durinr, the initial investigation by operations personnol. I w1 No coTrective action taken as avstem onerabilieu rastnred itself ,nd rho I 3 1 described condition has not recurred. I FAI I

. . .o

$T E  %*?Wie CTwge574Tyg gg a v'  ; SCgv gav Ot3Ca'*f'GN i s L Ej @ l 0 19 l5 l @ l NA l [Aj@loneratorobservition l

. C

..fruuu r., ..u u. ".v3vsv :. .Criurv @ " LoCar 2s o. . au. @

L,' L.J. L. W@l i.

ZJ @o,,

c.it is, NA l l NA l

Pfm50%%

w.,u . tLE**0vvStall ,,  :::...v,o, @

NA

[ T 11010 ' '

I Ol@LZJ@l" .

l

....esul'.s . 'in.

s oth='*nc NA f'Tl l. OIDstaI Ol@l o i: .o LO55 08 04 Davauf 'O 8&Cle T*y hi t* E Ogs;a:e*iog NA l L,' L .J l,_ZJ@l o .o

.,,, ," ' e,'s'; . ,,, os @ N"CUSEC^

a N\ l lIIIIfIilI fI I

. d. 8l 2 .. .. .2 sa.ec= eat Anta J. N ne- -ass $904)795-6486 (SEE AITACHED SUPPLEMENTARY INFORMATION SHEET) 7 9 010 90 /G

SUPPLEMENTARY INFORMATION Report No.: 50-302/78-066/03L-0 Facility: Crystal River U dt #3 Report Date: 29 December 1978 Occurrence Date: 8 December 1978 Identif'ication of Occurrence:

One pair of Auxiliary Building exhaust ventilation fans incperable contrary to Technical Specification 3.7.8.1.

Conditions Prior to Occurrence:

Mode 1 (95%).

Description of Occurrence:

At 1430, while performing Surveillance Procedure SP-345, Auxiliary Building Ventilation Exhaust System Monthly Test, low air flow and imbalanced fan loads were experienced while operating AHF-14B & 14D, Auxiliary Building exhaust fans. An Auxiliary Building supply fan AHF-lla was secured to prevent positive pressures within the Auxiliary Building. Normal air flow and fan operability was restored within two hours.

Designation of Apparent Cause:

The cause of this event cannot be determined as normal operation and air flow returned during the initial investigation by Operations personnel.

Analysis of Occurrence:

There was no hazard to plant or general public as negative pressures were maintained within the Auxiliary Building and a redundant fan system was available and operable.

Corrective Action:

No corrective action taken as system operability restored itself. As a result of a later investigation of the Auxiliary Building ventilation exhaust system, damper #34 in the Spent Fuel area exhaust was found about 85% closed.

Failure Data:

Six previously reported occurrences, but first reported event of this type.

/rc