ML19308D374

LER 77-159/03L-0:on 771228,reactor Bldg Purge Exhaust Valve AHV-1B Did Not Auto Close Upon Reactor Bldg Purge Initiation.Caused by Purge Exhaust Valve AHV-1B Not Being Open Enough to Activate Automatic Closure Matrix

ML19308D374
Person / Time
Site:	Crystal River
Issue date:	01/17/1978
From:	Stewart W FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19308D366	List: ML19308D365 ML19308D374
References
LER-77-159-03L, LER-77-159-3L, NUDOCS 8002270825
Download: ML19308D374 (2)

Text

- _

.. . . , n, -

NRC FoMa4 384

• t. U.S. NUCLEAR RCCULA3oRY Comuassiom s LICENSEE EVENT REPORT EXHIDIT A y CoNTRob Stoci.: l 3 (PLEASE Pf.3NT oR TYPE ALL RioU RLo iNFoRMATloN3 l- l l l . lh

['4"iTl lF l Ll q Rl P13 l 0101- l 01 OJ

. . , m.~,.._. .. ,

0g 0;O ; ;0;O; m.~..~... ., .g .4l 1;1l1 1 g ;_g ,; g m . m .... - , , . . ,

con'T i

f7TT1 o .

C ' @ lo; Sio r -!OI 3f 0 2 gi 1 2..sa...

., aae.., w . . .

2 ; 8,7 7 gl0 ; li 1;7 7; Sig r. s ...c. , a . . ..

av Nr cesCairTioN ANo

• Roe AsLa CoNsacurNCes @

o l Upon initiation of a Reactor BuilA4nir nurtre. a M crh vmA4m,4nn m i s r.n f

,was received from purge monitor RM-A1. RB purge exhaust valve AHV-1B did

,, , i ,not auto close contrary to T' ch e Spec 3.6.3.1. No safety hazard as redundant ,

, exhaust valve ARV-1A operated as designed. First occurrence of this event. ,

,With valves AHV-1A,1C, & 1D closed, valve ARV-1B was openad, auto closed Iot,IIand closure was timed. The valve operated as desinned and closure time I

,,,,,,was 5 seconds. AHV-1B was restored operable.

.49 . CD*'80%.4,0001 Sba Cf Sw : .

I

io i .i i 1 0 @ CE .L,, l@

I L,, *J @ l V' ^8 L ' V! I P!@ @@mg @ ,

.. I

......L

. m .... , ..

coo sc

,,.... .. .. m ... ,o  :

W

@ .,u.g."

y

' ,,,7171 l [J l 11 519 i W L(_l u b,, (gj l

_,, ,: u  :. .. ,, ., ., u cr: um .a n v. m ., @o a.w .;;:,n T:=

W@ I =

Jua'::..

I 3 i si o Iq ,

L_Z!@ L, .,9@ LZj@ I.O I O I 0 LIJ@ t.s,j@ ., ,

>. . u . .,

CAUSE oESCRISTICN ANo CORRECfl% E ACTIO%3 exhaust valve ARV-1B had been opened J

,,,,,g Upon initiation of RB purge, ,

,slightly when RM-Al high alarmed. The "open" limit switch had not been ,

, activated and the auto closure matrix had not been completed. When the high ,

alarm from RM-Al was received, auto closure was not effected. A Request. ,

, for Engineering Information has been submitted to evaluate this occurrence. ,

' ' ~

s g [c.j @ l1 [ 0 [ 0l @,a

. . . . om.. .,m, NA

@ s.'Mif:

l g gl

ur. ... :n:....

Operator observatio@n I r . , , , , ,gg,,,

i: .i - as a

..u .u . -. ..u .o ..r.,,... Loc...s....u.o @

W [,_Zj @ [Z_jg l NAm,- @l l NA l

, . , i ,,

- .f.,0%% .l gvws.e L 0 4 0,.b . 1 7 54.'.T,#,

lW l 010 ! O l@lZ.,j@l 'A l

. .-m.. il'.,..'ineus.=es@

i .; . l l 010 l 0 l@[ NA l e.t" 0;*,g'i,';,= c"'" @

NA 8, L, Il@l . ..

I v- umt w

a

.,d,, l@1;;....,..,,@ NA M  ! It !ItIiiI' t, !

NAvee. uAR R '1 o e. / ost (813) 866-4159 W/ l

- (SEE ATTACHED SUPPLEMENTARY INFORMATION SHEET) gggggqq s

- - - , - - - - - .,-,,em,- ,,-,,e-,,,,,w-

. _ , , - ,-,,~,,,,,,,r,-,,

SUPPL 2 MEN 1*AIG INFORMATION

1. Report No.: 50-302/77-159 /03L-0 ,

2. Facility: Crystal River Unit #3

3. Report Date: 17 January 1978

4. Occurrence Date: 28 December 1977

5. Identification of Occurrence:

Containment isolation valve ARV-1B failed to close upon RM-Al high radiation alarm contrary to Technical Specification 3.6.3.1, Table 3.6-1.

t

6. Conditions Prior to Occurrence:

Mode 1 power operation.

7. Description of Occurrence: (

At 1745, a Reactor Building purge was initiated. Reactor Building purge monitor 5 RM-Al alar:ned high and the containment purge exhaust valve AHV-13 did not close.

The valve was closed by using the control switch on the ES control panel. Redundant valve AHV-1A operated as designed. Investigation revealed that valve AHV-13 had been opened slightly when initiating the purge and had not activated its open limitsvitch.

The closure matrix was not complete and when RM-Al high alarmed the closure of AHV-13 was not effected. With purge supply valves AHV-lc and AHV-lD closed and purge exhaust valve AHV-1A closed, valve AHV-13 was fully opened. The valve was closed by iniciating a high alarm on EM-A1. The closure was timed and the results of closing and timing were satisfactory and the valve was restored operable.

S. Designation of Apparent Cause:

The cause of this event was due to purge exhaust valve AHV-13 not being opeo enough i to activate its automatic closure matrix.  !

l

9. Analysis of Occurrence:

There was no safety hazard to the plant or general public as redundant purge exhaust valve AHV-1A was operable and closed as designed.

10. Corrective Action: .

A request for Engineering Information (REI) has been submitted to investigate and evaluate this occurrence and to recommend action to ensure auto closure of valve upon receiving a high radiatica alarm from RM-A6.

11. Failure Data:

This is the first occurrence of this event.

s

-