05000271/LER-1982-026-03, /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

/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 File:NorthStar Vermont Yankee icon.png
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: 05000271/LER-1982-026, Forwards LER 82-026/03L-0 05000271/LER-1982-026-03, /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
References
LER-82-026-03L, LER-82-26-3L, NUDOCS 8302010318
Download: ML20028F392 (1)

LER-1982-026, /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

Event date:
Report date:
2711982026R03 - NRC Website

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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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.

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JJ 34 Jb J6 37 40 41 42 43 44 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.

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A 3 10 68 69 80 NAME OF PREPARER James P. Pelletier (802) 257-7711 g

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