2CAN100404, Unit 2, Special Report - Main Steam Line Radiation Monitor

Unit 2, Special Report - Main Steam Line Radiation Monitor

ML042890014
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/11/2004
From:	James D Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
2CAN100404
Download: ML042890014 (2)

Text

EnLterg {a Entergy Operations, Inc.

1448 S R. 333 Russellville, AR 72802 Tel 501 8585000 2CAN100404 October 11, 2004 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

Subject:

Special Report - Main Steam Line Radiation Monitor Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6

Dear Sir or Madam:

Arkansas Nuclear One - Unit 2 (ANO-2) Technical Specification (TS) 3.3.3.1, Radiation Monitoring Instrumentation, Table 3.3-6 Item 2.c. requires a minimum of one Main Steam Line Radiation Monitor per steam line to be operable in Modes 1, 2, 3, and 4. Action 19 of Table 3.3-6 stipulates, "With the number of OPERABLE channels less than required by the Minimum Channels OPERABLE requirements, initiate the preplanned alternate method of monitoring the appropriate parameter(s) within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, and: 1) either return the inoperable channel(s) to OPERABLE status within 7 days of the event, or 2) prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within 14 days following the event outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE status."

On September 27, 2004, with ANO-2 in Mode 1 (Power Operation), the "B" Main Steam Line Radiation Monitor (2RE-1057) was declared inoperable as a result of intermittent spiking. TS 3.3.3.1 Action 19 was entered at approximately 2015. Troubleshooting and repair efforts were initiated and Chemistry was notified to initiate alternate sampling (once per shift) within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, as required.

Troubleshooting efforts to date have included detector replacement and channel calibration, ratemeter replacement, and electronic component replacements.

As of this date, the cause of the failure has not yet been determined and repair efforts continue. It should be noted that these efforts are complicated by the intermittent nature of the failure of 2RE-1057.

2CAN100404 Page 2 Alternate sampling of the Main Steam System will continue until 2RE-1057 is returned to operable status.

Additionally, 2RE-0201, the UB" Main Steam Line N16 radiation monitor, remains operable and in service.

There are no commitments contained in this report.

Sincerely 7Dale James

& Dire tor, Nuclear Safety Assurance (Acting)

DEJ/rhs 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. 0. Box 310 London, AR 72847 U. S. Nuclear Regulatory Commission Attn: Mr. Thomas W. Alexion MS O-7D1 Washington, DC 20555-0001 Mr. Bernard R. Bevill Director Division of Radiation Control and Emergency Management Arkansas Department of Health 4815 West Markham Street Little Rock, AR 72205