2CAN060504, Unit 2, Submittal of Report to Provide Information Re Replacement Valve Disc Manufactured by Crane-Aloyco

Unit 2, Submittal of Report to Provide Information Re Replacement Valve Disc Manufactured by Crane-Aloyco

ML051710357
Person / Time
Site:	Arkansas Nuclear
Issue date:	06/16/2005
From:	James D Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
2CAN060504
Download: ML051710357 (4)

Text

Entergy Operations, Inc.

A Entergy .1448 S.R. 333 RusselIville, AR 72802 Tel 501 858 5000 2CAN060504 June 16, 2005 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

Subject:

10CFR21 Report Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6

Dear Sir or Madam:

The attached report is being submitted in accordance with the provisions of IOCFR21 to provide information regarding a replacement valve disc manufactured by Crane-Aloyco.

There are no commitments contained in this submittal. If you have any questions regarding the report, contact Richard Scheide at 479-858-4618.

Sincerely, Dal . James Ac ng Director, Nuclear Safety Assurance DEJ/rhs Attachment III2

2CAN060504 Page 2 cc: Dr. Bruce S. Mallett Regional Administrator U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 NRC Senior Resident Inspector Arkansas Nuclear One P.O. Box 310 London, AR 72847 U. S. Nuclear Regulatory Commission Attn: Mr. Drew Holland Mail Stop 0-7 D1 Washington, DC 20555-0001

Attachment to 2CAN060504 IOCFR21 Report

Attachment to 2CAN060504 Page 1 of 1 On March 19, 2005, during refueling Outage 2R17, it was identified that a Flex-wedge valve disc drawn from inventory and intended for installation in a Containment Sump isolation valve did not have a machined slot around the disc edge, as required by the purchase specifications. A feature of the flex-wedge design is to allow the disc faces to flex, thereby reducing the potential for thermal binding.

The inboard and outboard containment sump isolation valves (2CV-5647-1, 2CV-5648-2, 2CV-5649-1, and 2CV-5650-2) for Arkansas Nuclear One, Unit 2 (ANO-2), are 24 inch motor operated gate valves manufactured by Crane-Aloyco. The outboard containment sump isolation valve is normally closed and receives a Recirculation Actuation Signal (RAS) to open when the Refueling Water Tank volume is depleted (post-LOCA) in order to shift the Emergency Core Cooling System (ECCS) suction to the containment sump. Had the subject disc been installed in this valve, the discrepancy could have resulted in thermal binding of the disc, thereby potentially preventing the valve from opening and rendering a complete train of ECCS inoperable upon initiation of a RAS.

The discrepancy was identified during pre-installation inspection; therefore, the disc was not installed in the plant. Considering that extensive machining and handling of the disc is necessary during installation, it is extremely unlikely that the discrepancy could have gone undetected. This type valve disc is not utilized in any other safety related applications at ANO.

The subject disc was delivered to Arkansas Nuclear One as a spare part in 1991.

This condition was determined to be reportable pursuant to 10CFR21 on 5/17/2005 and the NRC Operations Center was notified at 1024 CDT on that date (EN# 41702).