ML20010C729

Updated LER 80-041/03X-2:on 801229,routine Surveillance Discovered Water Leaking from 4-inch Reactor Water Cleanup Line Between Regen & Nonregen Heat Exchangers.Caused by Stress Corrosion Cracking.Affected Portion of Pipe Replaced

ML20010C729
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	08/05/1981
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20010C726	List: ML20010C725 ML20010C729
References
LER-80-041-03X, LER-80-41-3X, NUDOCS 8108200354
Download: ML20010C729 (2)

Text

QFony ass Correction to UPDATE REF9RT - Previous Report 1/28 /810. S. NUCLEAR R EGULATOQY COMMISSION UPDATE REPORT 7/8/81 LICENSEE EVENT REPORT LER 80-41/3X CONTROL BLOCK: l i

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EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h 10121 l During startup at 24 percent power, routine operation surveillance d scovered water I lo I31 i leaking f rom the 4 inch. Reactor Water Cleanup Line between the Regen and the Non- J 101411 Regen heat oxchangers. Upon close inspection, two areas of water weepage were l I o I 51 i found. There were no consequences to the public health and safety as a result of I I O 16 I i this event. Similar occurrences were reoorted to the commission as T ER 80-37 and I I o I 7 I I 1 FR 79-01. I I o 181 1 I F 8 9 80 CE CODE Su8CO E COMPONENT CODE

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VTVYS1 Correction to UPDATE REPORT 7/8/81 O 00 Previous Report 1/28/81 L 80 41/3X Cause Descriptica and Corrective Actions:

The Reactor Cicanup Line was isolated and the affected portion of the pipe was replaced with a low carbon stainless steel pipe. The pipe material f rom the regenerative to the Non Regenerative Heat Exchanger was ASTM-A-312. Type 304.

An examination by Battelle Laboratories revealed branching, trans-granular cracks originating f rom pitted areas on the outside diameter surface of the pipe. Scanning electron microscope and metallographic examinations confirmed the transgranular nature of the cracks. X-ray defraction revealed high amounts of chloride in the corrosion product on the outside surface of the pipe. The corrodent indicated the cracks were a result of chloride-stress-corrosion cracking. It appears that the long-term leaching of the asbestos insulation by a high purity water leak f rom a faulty fitting brought i a sufficient amount of chlorides to sne surface of the not pipe (575"F) to f result in Stress Corrosion Cracking.

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