ML102110048

Special Report of Inoperability of High Range Noble Gas Monitor

ML102110048
Person / Time
Site:	Palisades
Issue date:	07/28/2010
From:	Patricia Anderson Entergy Nuclear Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RIA-2327
Download: ML102110048 (2)

Text

Entergy Nuclear Operations, Inc.

Palisades Nuclear Plant

ý--Eniergy. 27780 Blue Star Memorial Highway Covert, MI 49043 Tel 269 764 2000 Paula K. Anderson Licensing Manager July 28, 2010 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

SUBJECT:

Special Report of Inoperability of High Range Noble Gas Monitor Palisades Nuclear Plant Docket 50-255 License No. DPR-20

Dear Sir or Madam:

The Palisades Plant Offsite Dose Calculation Manual, Appendix A, Table A-i, Action 4, requires that'a special report be submitted to the Nuclear Regulatory Commission within 30 days for the inoperability of RIA-2327, High Range Noble Gas Monitor, when the instrument is not restored to operable status within 7 days. The enclosed report summarizes the actions taken, the cause of the inoperability, and the plans and schedule for restoring the instrument to operable status.

Summary of Commitments This letter contains no new commitments and no revisions to existing commitments.

Sincerely, PKA/TAD Enclosure (1)

CC Administrator, Region III, USNRC Project Manager, Palisades, USNRC Resident Inspector, Palisades, USNRC IN1UL

ENCLOSURE SPECIAL REPORT FOR INOPERABLE RIA-2327 HIGH RANGE NOBLE GAS MONITOR BACKGROUND RIA-2327, High Range Noble Gas Monitor, was declared inoperable on July 4, 2010, after annunciation of its associated control room alarm. The monitor's fail light was illuminated and the digital display indicated "E0007."

ACTIONS TAKEN The preplanned alternate method of monitoring is in place as a compensatory measure,'

CAUSE OF INSTRUMENT INOPERABILITY The source of the problem with RIA-2327 has been attributed to aging, causing degraded internal connections that result in communication failures between components. RIA-2327 has been in-service approximately 20 years.

PLANS AND SCHEDULE FOR RESTORING INSTRUMENT OPERABILITY RIA-2327 is targeted for replacement with equivalent components by September 22, 2010.

After replacement, RIA-2327 will be monitored for an appropriate period of time, with the compensatory measure remaining in place, before being declared operable.

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