ML20028F392

LER 82-026/03L-0:on 821220,while Shifting from Reactor Bldg Closed Cooling Water HX B to A,Closed Cooling Water Temp Rapidly Dropped 20 F.Caused by Increased Efficiency of HX Upon Cleaning

ML20028F392
Person / Time
Site:	Vermont Yankee
Issue date:	01/19/1983
From:	Pelletier J VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028F383	List: ML20028F382 ML20028F392
References
LER-82-026-03L, LER-82-26-3L, NUDOCS 8302010318
Download: ML20028F392 (1)

Text

NEC FOIM 366 U. S. NUCLE A2 RE!ULATORY COMMISSION LICENSEE EVENT REPORT LER 82-26/3L CONTAOL BLOCK: l l

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@ lV i a 9IT l LICENSEE V l Y IC00g S l 1to l@l 0 l 0 l -l 0LICENSE 15 l 0l NuM8ER 0l 0l 0l -l 0l 0l@l4 2S 26 l1LICENSE l1 l1TYPE l 1JQl@l67 CAT l 68 lg CON'T 10111 7 8 3[.,% l L l@l 0 l 5 l 010 l 0 l 2l 7 l 1 @l1 l2 l2 l0 l 8 l 2 l@l0 l 1 l 1 l 9 l 8 l 3 l@

60 61 DOCK ET NUM8ER 68 69 EVENT DATE 74 75 REPORT OATE 80 -

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h ITT'n IWhile shif ting from RBCCW Heat Exchanger B to A, the closed cooling water tempera-  ;

[TTT1 l ture rapidly dropped 20? F. This caused Drywell Air Temp. to fall and caused the ,

l o l .1 l Drywell to Torus AP to drop below 1.7 psi. This drop in AP was in excess of that  ;

l o i s i l permitted by Tech. Spec. Section 3.7._A.9. As a result of this event, there were no g lolelladverse consequefces to the public health and safety. There were no similar events ; -

IIITl Ireported to the commission within the past five years. l 10181I l 7 8 9 80 E CODE SB E COMPONENT CODE SUSCODE S E 10191 7 8 9l Sl Al@ l Xl@ lZ l@ [ Zl Zl Zl Zl Zl Zl@ {@ ]@

10 11 12 13 Us 19 20 SEOufNTIAL OCCURRENCE REPORT REVISION

_ EVE =T# EAR REPORT NO. CODi TYPE NO.

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47 CAUSE DESCRIPTION AND CORRECTIVE ACrlONS h lijol]The cause of this event was due to the increased efficiency of the RBCCW Heat Ex- l 8 l changer upon cleaning. Af ter. switching to a cleaned Heat Exchanger, the cooling i iil2i l water was rapidly cooled at an increased heat transfer rate. The increased rate was; Iil3l l unanticipated and caused the drop in the Drywell to Torus AP. AP was promptly re- l m I stored and personnel have been instructed to anticipate this effect. l 7 8 9 80 ST S *. POWE R OTHER STATUS 015 O RY DISCOVERY DESCRIPTION l1 15* l'l El@ l 0 l 9 l 9"l@l" NA l lAl@lOperatorObservation l i

' " " '8 80 ACTIVITY ColTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY ION OF RELEASE NA j LOYA I' I6 *l d * @ l Z l@l l

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