ML052660232

Post Accident Monitoring Instrumentation Report

ML052660232
Person / Time
Site:	North Anna
Issue date:	09/15/2005
From:	Jennifer Davis Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
05-608
Download: ML052660232 (2)

Text

VIRGINIA ELECTRIC AND POWVERl COMPANY RIcIIONIoI, VIRGINIA 23261 September 15, 2005 United States Nuclear Regulatory Commission Serial No.05-608 Attention: Document Control Desk NAPS: MPW Washington, D.C. 20555 Docket Nos. 50-338/339 License Nos. NPF-4/7 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS 1 & 2 POST ACCIDENT MONITORING INSTRUMENTATION REPORT Pursuant to North Anna Technical Specification (TS) 3.3.3.B and TS 5.6.6 a Post Accident Monitoring (PAM) Instrumentation Report is hereby submitted due to an excore source range neutron flux indication channel being out of service for greater than thirty days.

At 2227 hours0.0258 days <br />0.619 hours <br />0.00368 weeks <br />8.473735e-4 months <br /> on August 5, 2005, North Anna Unit 2 experienced an automatic reactor trip from 100 percent power during a severe thunderstorm. Following the trip the Channel III Excore Source Range Neutron Flux Indicator failed. Subsequent troubleshooting and cable testing determined a fault on the A3 cable at approximately 596 feet from the cable test point. This location is at a junction box in the basement of the Unit 2 containment building. The cable fault condition was not determined until after Unit 2 was returned to full power operation. The location of the junction box is not accessible during normal power operations. Repairs to the A3 cable have been scheduled during the 2005 Unit 2 fall refueling outage.

The Station Nuclear Safety and Operating Committee has reviewed this report. Should you have any questions regarding this report, please contact us.

Sincerely, J. M. Davf/'

Site Vice President Commitments made in this letter: Indicator repairs will be scheduled during the 200, Unit 2 fall refueling outage. Wi

cc: U. S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center Suite 23T85 61 Forsyth St., SW, Atlanta, Georgia 30303 Mr. J. T. Reece NRC Senior Resident Inspector North Anna Power Station