ML19210E363

LER 79-056/03L-0:on 791030,seven of Eleven Helium Circulator Seal Malfunction Pressure Differential Switch Units Tripped Outside Tech Specs.Caused by Dirt Accumulation in Electrical Switches.Switches Cleaned,Readjusted & Checked Monthly

ML19210E363
Person / Time
Site:	Fort Saint Vrain
Issue date:	11/29/1979
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19210E364	List: ML19210E363
References
LER-79-056-03L, LER-79-56-3L, NUDOCS 7912040406
Download: ML19210E363 (1)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION 1747). + -

LICENSEE EVENT REPORT CONTROL BLOCK: l 1

l l l l l lh 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 o i 8 9 lCl0IrlSlvi1l@l0l0 - 1010 l0 l010 l- 1010 l@l4 Il Il i210 l@l LICENSEE CODE 14 15 LICENSE NUMSER 25 26 LICENSE TYPE JO l

$7 CAT $8 l@

CON'T o

7 1

8 SOURCE l60L @l610 l 5 l 0 l 0 l 0 l 2 l 6 l 687 @l OOCKET NUMBER 69 1 l EVENT 0 l 3OATE 10 l 7 l749 @l 75 1 REPORT l 1 l 2DATE l 9 7l9[@ 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 l During testing, it was discovered that seven of twelve helium circulator seal mal- l 0 3 l function pressure differential switch units tripped outside l 0 4 l the limits of LCO 4.4.1, Table 4.4-3. Reportable per Technical Specification AC l O s 7.5.2(b)1 and AC 7.5.2(b)2. No effect on public health or safety. Redundant system l p l available and operable. Similar reports RO 77-47, preliminary reports RO 78-27 and l yl l RO 79-32. ]

O a i l 7 8 9 80 COI:'E "#iE C0 SU8CiOE COMPONENT CODE SL8C O'E SU E 7

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l Cl B lh Wh E lh l Il Nl Sl Tl Rl Ulh l S l@ l Zlh 9 to 11 12 13 18 19 20 SEQUE NTI AL OCCUR R E NCE REPORT REVISION

_ EVENT YEAR REPORT No. CODE TYPE NO.

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_,21 22 23 24 26 27 28 29 30 31 32 T K N A ON ON P NT M HOURS 22 S8 i FOR 8. SUPPL E MANUFAC RER l33 X lg 34X lg l35Zlg [M Zl@ 31

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lY lg 41 42 N[g l4 Nj@ lBl0l8l0l@ 4 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i O lITT Barton Model 289 pressure differential switches failed to actuate et trip point I p, , due to dirt accumulatien in electrical switches. Affected switches cleaned and read ;

, ,  ; justed to proper trip points. Surveillance test successfully cOcpleted. Trip  ;

settings being checked on a monthly basis. Problem under investigation.  ;

i 4 l l 7 8 9 80 SA  % POWER OTHER STATUS 015 0 RY OISCOVERY DESCRIPTION i s W@ l0 l 0 l 0 l@l N/A ~

l l B l@l Surveillance Test l AbVITY CO TENT aELEASED OP RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6

@ lZ l l N/A l l N/A l PERSONNEL EXPOS ES NUMBER TYPE DESCRIPTION i 7 l 0 l 0 l 0 l@l Z l@l N/A l PERSONN E L INJURIES NuMsER OESCRIPTION @

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a 8 9 l 0l 0 l 0l@l 12N/A 11 l

80 LOSS OF OR DAMAGE TO FACILITY I TYPE DESCRIPTION M y

7 8 9 Z l@l 10 N/A hh11V 80 l

e 2 O lN ISSUEf@lOE N/A CRIPTION l lllllllll ll lj 7 8 9 10 68 69 80 ;

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