05000456/LER-2010-003

11-15-2010

On September 15, 2010, at 0758, Operations was notified that a potential for leakage existed on a weld on a 3/4-inch diameter stainless steel line which extends from the reactor coolant pump seal water injection filter to the 1B seal water injection filter vent valve. Limiting Condition for Operation (LCO) 3.5.5, "Seal Injection Flow," was conservatively entered based on a postulated failure of this line due to pressure boundary leakage. The LCO was exited at 0939 when the 1B seal injection filter, including the potentially leaking vent pipe, was isolated from the chemical volume and control system within the allowed completion time of the LCO. At 1121 on September 15, 2010, following cleaning, a through-weld leak was confirmed on one weld through visual inspection.

The cause of the leakage was determined to be transgranular stress corrosion cracking (TGSCC) that was accelerated' by the existence of an original fabrication flaw. The corrective action was to repair the through-weld leak. This action has been completed.

There were no actual safety consequences impacting plant or public safety as a result of the event.

This event is reportable under 10 CFR 50.73(a)(2)(i)(B), any operation or condition which is prohibited by the plant's Technical Specifications.

LER-2010-003, Through-weld Leak of the Line from the 1B Seal Injection Filter to the Vent Valve
Braidwood Station
Event date:	09-15-2010
Report date:	11-15-2010
Reporting criterion:	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
4562010003R00 - NRC Website
v • d • e

A. Plant Operating Conditions Before The Event:

Event Date: September 15, 2010� Event Time: 0758 CDT Unit: 1 MODE: 1� Reactor Power: 100 percent Unit 1 Reactor Coolant System (RC) [AB]:� Norma

Licensee Event Report

Braidwood Station

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		Reporting criterion
05000457/LER-2010-001	Essential Service Water Pump 2A Braided Hose Failure Resulted in a Condition Prohibited by Technical Specifications
05000456/LER-2010-003	Through-weld Leak of the Line from the 1B Seal Injection Filter to the Vent Valve	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications

05000456/LER-2010-003

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