ML19305D709

LER 80-016/03L-0:on 800322,during Testing,Four of Twelve Helium Circulator Seal Malfunction Pressure Differential Switch Units Tripped Outside Specs.Caused by Dirt Accumulation in Electrical Switches.Readjusted Switches

ML19305D709
Person / Time
Site:	Fort Saint Vrain
Issue date:	04/09/1980
From:	PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19305D708	List: ML19305D707 ML19305D709
References
LER-80-016-03L, LER-80-16-3L, NUDOCS 8004150438
Download: ML19305D709 (1)

Text

\/N NRC FCCM 366 U.S. NUCLEAR RECULATCOY COMMISSION

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LICEIVSEE EVENT REPORT O CONTROL BLOCK: l 1

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CATE 61 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121 l During testing. it was discovered that four of twelve helfum Mrculator saal mal fime- 1 I O l a I i tion pressure differential switch units tripped outside the limits of LCO 4.4.1, l IO l4 l l Table 4.4-3. Reactor operation during test interval. Reportable per Technical Speci-!

l0l5l t fication AC 7.5.2(b)1 and AC 7.5.2(b)2. No effect on public health or safety. Re- l 10lsl l dundant system available and operable. Similar reports are RO 77-47. Final. and" Pre- 1 ITTTl l liminary reports RO 78-27, RO 79-32, RO 79-56, and R0 80-07. I 10181 l I 80 7 8 9 COI:'E C0$E SNCO$E COMPONENT CODE Sus O'E $ Q lM 7 8 l Cl Blh W@ l E l@ l Il Nl Sl Tl Rl Ul@ W@ l zl@

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33 34 36 37 40 41 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I i 10 I I ITT Barton Model 289 pressure differential switches failed to actuate at trip point I g l due to dirt accumulation in electrical switches. Affected switches re-adiusted to l lii7; I proper trip points. Trip settings being checked on a mcinthly basis. Redesign of I l3 l3l l system being evaluated. l 11 141 l l 7 8 9 80 ST  % POWER OTHER STATUS Dis Y DISCOVERY DESCRIPTION Ii l5 l l Glh l 0 l 0 l 0 l@l N/A l l C l@l Operability Test i ACTIVITY CO TENT RELEASED OP RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Ii Is 8I 9W @ l z10 l@l N/A l lN/A l i 7 ft 44 46 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION i l1 l 7 l l 0l 0 l 0l@l zl@l N/A

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