ML20052G531

LER 82-028/03L-0:on 820410,during Cold Shutdown,While Removing Pipe Insulation to Access RHR Fill Line Valves for Maint,External Corrosion Found on RHR Fill Pump 1P-70 Min Flow Line.Caused by Moisture Retention by Pipe Insulation

ML20052G531
Person / Time
Site:	Duane Arnold
Issue date:	05/10/1982
From:	Hill K IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052G453	List: ML20052G452 ML20052G531
References
LER-82-028-03L, LER-82-28-3L, NUDOCS 8205180440
Download: ML20052G531 (1)

Text

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lo 1211 During cold shutdown, while removinq pipe insulation to access RHR fill I Lo_Ltl I line valves for maintenance, external corrosion was found on RHR fill nii I Io 1. i 1 mp 1P-70 minimum flow line (1"-GBB-26). The Dioe is a 1-inch diamnto,- Al I to , , , i 06 carbon steel pipe with a min. acceptable wall thickness of 0.154 inch I

,oiii es. Portions of the min. flow line were found to have wall thicknesses 1 I go,7, l ess than the min. acceptable value. The smallest wall thickness found wa I go,,,i s 0.017 inches. There have been no previous similar occurrences. I 1 ..

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li # o 1 l Corrosion attributed to moisture retention by the pipe insulation. Appro I ii li i ! ximately 18 ft. of piping was replaced, painted, and left uninsulated to 1 ii2i l preclude future external corrosion. No further corrective action is plan ,

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