BSEP 12-0128, Special Report - Technical Requirements Manual Section 3.4, Accident Monitoring Instrumentation

Special Report - Technical Requirements Manual Section 3.4, Accident Monitoring Instrumentation

ML12340A404
Person / Time
Site:	Brunswick
Issue date:	11/14/2012
From:	Pope A Duke Energy Corp
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
BSEP 12-0128
Download: ML12340A404 (3)

Text

PDuke WEnergy NOV 14 2012 Serial: BSEP 12-0128 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

Subject:

Brunswick Steam Electric Plant, Unit No. 1 Docket No. 50-325 Special Report - Technical Requirements Manual Section 3.4, Accident Monitoring Instrumentation In accordance with Technical Requirements Manual Section 3.4, "Accident Monitoring Instrumentation," for the Brunswick Steam Electric Plant (BSEP), Unit No. 1, Carolina Power & //

Light Company (CP&L) is submitting the enclosed Special Report associated with the Unit 1 Safety/Relief Valve Position Indication.

This document contains no regulatory commitments.

Please refer any questions regarding this submittal to Mr. Lee Grzeck, Manager - Regulatory Affairs, at (910) 457-2487.

Sincerely, Aqnntt .Pp Manager - Organizational Effectiveness Brunswick Steam Electric Plant MAT/mat

Enclosure:

Special Report - Unit 1 Safety/Relief Valve Position Indication

U.S. Nuclear Regulatory Commission Page 2 of 2 cc (with enclosure):

U. S. Nuclear Regulatory Commission, Region II ATTN: Mr. Victor M. McCree, Regional Administrator 245 Peachtree Center Ave, NE, Suite 1200 Atlanta, GA 30303-1257 U. S. Nuclear Regulatory Commission ATTN: Ms. Michelle P. Catts, NRC Senior Resident Inspector 8470 River Road Southport, NC 28461-8869 U. S. Nuclear Regulatory Commission (Electronic Copy Only)

ATTN: Mrs. Farideh E. Saba (Mail Stop OWFN 8G9A) 11555 Rockville Pike Rockville, MD 20852-2738 Chair - North Carolina Utilities Commission P.O. Box 29510 Raleigh, NC 27626-0510

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BSEP 12-0128 Enclosure Page 1 of 1 Special Report - Unit I SafetylRelief Valve Position Indication

Background

On October 4, 2012, one channel of the Brunswick Steam Electric Plant (BSEP), Unit No. 1 Safety/Relief Valve Position Indication, Secondary-Temperature (i.e., Function 3.b. of Technical Requirements Manual (TRM) Table 3.4-1, "Accident Monitoring Instrumentation") was declared inoperable due to cycling of the tailpipe temperature indication (i.e., temperature element 1-B21-TE-NO04C) for Safety/Relief Valve (SRV) 1-B21-F013C (i.e., SRV 1C. As a result, Condition A of TRM Section 3.4, "Accident Monitoring Instrumentation," was entered, which required the position indication to be restored to operable status within 31 days. Repair of temperature element 1-B21-TE-N004C cannot be completed with the unit online and, as a result, Condition C of TRM Section 3.4 was entered on November 4, 2012. This Special Report is submitted in accordance with Condition C of TRM Section 3.4.

Cause of Inoperability On October 4, 2012, the temperature point for SRV 1C was noted to be erratic on the temperature recorder. The temperature element 1-B21-TE-N004C appeared to be failing and was declared inoperable when indicated Safety/Relief Valve tailpipe temperature was observed to be cycling 10 degrees F (peak to peak).

The temperature element is located inside the Unit 1 drywell. Further troubleshooting of the element is scheduled for the Unit 1 refueling outage in spring 2014, currently scheduled to begin on March 1, 2014. The cause of the erratic temperature element cannot be conclusively determined until the troubleshooting activities are completed. However, based on investigation efforts completed to date, the degraded condition is most likely a result of a degraded connection within the cabling inside primary containment or a degraded component internal to the temperature element. As such, the repair of temperature element 1-B21-TE-NO04C cannot be completed with Unit 1 online. Required repairs will be completed during the upcoming spring 2014 Unit 1 refueling outage.

Preplanned Alternate Monitoring Method During the time period that the 1-B21-TE-N004C is inoperable, the redundant Primary-Sonic Safety/Relief Valve Position Indication (i.e., Function 3.a. of TRM Table 3.4-1) instrumentation provides monitoring capability. Additionally, although inoperable, SRV C tailpipe temperature indication remains available using 1-B21-TE-NO04C.

Plans for Restoring the Instrumentation Any required repairs of temperature element 1-B21-TE-NO04C will be completed no later than the spring Unit 1, 2014, refueling outage.