ML19257B778

LER 79-036/03L-0:on 791219,during Testing of Reactor Core Isolation Cooling High Steam Line Differential Pressure Switches,Differential Pressure Switch Actuated at -196 Inches of Water.Caused by Setpoint Drift.Switch Adjusted

ML19257B778
Person / Time
Site:	Vermont Yankee
Issue date:	01/15/1980
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19257B776	List: ML19257B775 ML19257B778
References
LER-79-036-03L, LER-79-36-3L, NUDOCS 8001180311
Download: ML19257B778 (2)

Text

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LICENSEE EVENT REPORT LER 79-36/3L CONTROL BLOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 0 1 8 9 lV TlVlYIS 1l@l0 0 -l0l0l0l0l0l- 0l01@l4l1l1l1l1 LICENSEE CODE 14 15 LICENSE NUM8ER 25 26 LICENSE TYPE J0

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i O l The event was due to setpoint drift on a BartOn MOdel 288 differential pressure I1 ii l l indicating switch. The corrective action was to imediately adjust the switch to l i 2 l actuate at an equivalent steam line tap trip setting of -180" plus or minus 5" of i 3 l water and verify satisfactory operation. l LLLJ 7 8 9 l 80 STA  % POWER OTH ER STATUS OIS O RY DISCOVERY DESCRIPTION l

i s W@ l 1 0]0l@l NA l l B l@l Surveillance Test A T1VITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE M W @ d@l 7 8 9 10 11 NA 44 l

45 NA 80 l

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION i 7 l0l0l0l@lZl@l NA l PERSONNE L INJURIES oESCR,P1,0~h i a NUM8eR 10101018i NA 1770 296 80 i

7 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION 7

1 9 8 9 Whl 10 NA 80 ISSUE DESCRIPTION 7

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W. F. Conwav 8001180 /4 ' (PHONE. 802-257-7711 NAME OF PREPARER

VTVYS1 05000271 LER 79-36/3L EVENT DESCRIPTION AND PROBABLE CONSEOUENCES During routine surveillance testing of the RCIC high steam line dif-ferential pressure switches, it was discovered that Dif ferential Pressure Switch DPIS 13-84 actuated at -196" of water. The switch is designed to show a high flow in either direction in the event of a steam line break and is required to actuate at a differential pressu e less than or equal to 195" of water (as per Tech. Spec. Table 3.2.2). The redundant High Differential Pressure Switch 13-83 wcs available and operable. Based on the above, there were no adverse consequences to the public health or safety as a result of this event. Similar events were reported as A0 72-09, A0 79-15, A0 73-18, RO 76-42, and RO 78-07.

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