ML19250C066

LER 79-032/03X-1:on 790913,during Testing,Four Helium Circulator Seal Malfunction Pressure Differential Switch Units Would Not Trip or Tripped Outside Limits.Caused by Dirt Accumulation in Electrical Switches

ML19250C066
Person / Time
Site:	Fort Saint Vrain
Issue date:	10/03/1979
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19250C064	List: ML19250C063 ML19250C066
References
LER-79-032-03X, LER-79-32-3X, NUDOCS 7911060481
Download: ML19250C066 (2)

Text

.. 7 .

', uCENSEE EVENT REPORT CONTROL BLOCK: l 1

1 l l l l lh 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) o 1 lC l0LICEreSEE lF lS CODE lV l1 l@l 14 0 l 0 l -l 0 l O l 0 l 0 l 0 l - l O l O25 l@l LICENSE NUh'SER 26 4 lLaCENSEllll2 TYPEl 0JO l@l57 CATl 58 7 8 9 15 CON'T REPQR

?

O i 8

9 lL 60

@ 0l 61 S l 0lDOCKET 0 l NUMSER 0 l 2 l 6 l 687 @l 69 0 lEVENT 9 l DATE l l 3 l 719 l@l1 REPORT 74 75 10 10 l3 l780lo l@

DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h c 2 lDuring testing, it was discovered that four of twelve helium circulator seal malfunc- l o 3 [ tion pressure differential switch units either would not trip or tripper outside the 1 0 ,4 l limits of LCO 4. 4.1, Table 4. 4-3. Reportable per Technical Specification AC 7.5.2(b)1 j, o 5 jand AC 7. 5. 2(b) 2. No effect on public health or safety. Redundant system available l 0 6] land operable. Similar reports RO 77-47 and RO 78-27. l 0 7 l d O 8 DE CODE S SC E COMPONENT CODE SUSCODE i .CO E O 9 l C lB lh l_Ejh l E lh l I l N l S l T l R l U lh l Slh lZ_j h 18 19 20 7 8 9 10 11 12 13 SEOUENTI AL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO. CODE TYPE N O.

LE R 'RO b REQRTyu l7l9l l-l 0 3 2l d l013 l lX l l- l_1_j

,,,,, 21 22 23 24 26 27 28 29 30 31 32 KEN AC O ONP NT ME HOURS S8 FOR 8. SUPPLIER MANUFAC RER lX 33 l@l34 Xl@ l35Z l@ l36Z l@ l0l0l0l0l 31 40 l41Y l@ [42N l@ 43 N[@ lBl0l8l0l@

44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O IITT Barton Model 289 pressure differential switches failed to actuate at trip point l i i d6e tc dirt accumulation in electrical switches. Affected switches readiusted to I g jproper trip points. Trip settings being checked on a monthly basis. Problem under I

, 3 investigation. l I

L'_1__I I 7 8 9 80 STA  % POWER OTHER STATUS DISCO RY DISCOVERY DESCRIPTION 1 5 lE lh l 0 l 0 l 0 l@l N/A l l C l@l Operability Test l ACTIVITY CO TENT RELE ASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 6 l N/A l 7

1 8 9 Z l @ l10Z l@l N/A 11 44 45 80 PERSONNEL EXPOSURES NUMPER TYPE DESCRIPTION 1 7 l0 l0 l0 l@l Z l@lN/A . l PERSONNEL INJU IES NUMSER DESCRIPTION i a l0l0 0 l@l12N/A l 7 8 9 11 80 y l Z l@l N/A LOSS TYPE OF OR DAMAGE TO FACILITY (A*)

DESCRIPTION ,

j p7] i 2

J4 7 8 9 10 80 e

2 o N iSSUEf@lDE N/A CRIPTION l llllllllllllj 7 8 9 to 68 69 80 5 NAME OF PREPARER j PHONE: a

. L .-.- - . ..

OCCt1UtINCY REPORT DISTRIBLTION Number of Coeter Depa rtment o f Ener gy - - - - - - - - - - - - - - - - - ' - - - - - - - - - - - - 1 (P Letter)

San Francisco Operations Office Attna California Patent Croup 1333 Broadway Oakland, Cclifornia 94612 Departmen t o f Energy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter)

Office of Nuclear Engineering Programs Washington, D.C. 20545 Depar tment o f Ener gy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter)

Nuclear Rasetor Programs Branch Nuclear Power Development Division Main Stop T309 Washington, D.C. 20545 De p a rtmen t o f Ener gy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter)

Attu: Senior Program Coordinatoe P. O. Boz 81325 -

San Diego, California 92128 ltr. Zarl V. Seyfrit. Director ------------------------- 1 (original of P Letter Region IV and Copy of LER)

Office of Inspection and Enfo cament Nuclear Regulatory Conssission 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 Di r e c to r - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 J Letter, LER)

Office of Management Information and Program Control U. S. Nuclear Regulatory Cotumission Washington, D.C. 20555 W. M. Hawkins, Site Manager --------- ---------------- 10 (Original of 77LC Letter General Atomic Company plus Two Copies, one P. O. Box 426 Copy of P Letter, One Plattavilla, Colorado 80651 Copy of LER)

NRC Resident Site Inspector -------------------------- 1 (P Letter, LIR) 1271 345

.