NRC 2013-0061, 10 CFR 50.59 Summary Report for 2012

10 CFR 50.59 Summary Report for 2012

ML13179A452
Person / Time
Site:	Point Beach
Issue date:	06/28/2013
From:	Millen M Point Beach
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NRC 2013-0061
Download: ML13179A452 (2)

Text

June 28, 2013 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Point Beach Nuclear Plant, Units 1 and 2 Dockets 50-266 and 50-301 Renewed License Nos. DPR-24 and DPR-27 10 CFR 50.59 Summary Report for 2012 NEXTera POINT BEACH NRC 2013-0061 10 CFR 50.59( d)(2) NextEra Energy Point Beach (NextEra), LLC, is submitting the 10 CFR 50.59 Summary Report for the Point Beach Nuclear Plant (PBNP), Units 1 and 2, for calendar year 2012. This letter contains no new commitments and no revisions to existing commitments.

Very truly yours, NextEra Energy Point Beach, LLC Michael Millen Licensing Manager cc: Administrator, Region Ill, USNRC Resident Inspector, Point Beach Nuclear Plant, USNRC Project Manager, Point Beach Nuclear Plant, USNRC PSCW NextEra Energy Point Beach, LLC, 6610 Nuclear Road, Two Rivers, WI 54241 ENCLOSURE NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 10 CFR 50.59

SUMMARY

REPORT FOR 2012 10 CFR 50.59 Evaluations Modification:

Replacement of the Unit 1 and Unit 2 Circulating Water Pumps Activity

Description:

Modifications EC 262514 and EC 262515 replaced the Unit 1and 2 Circulating Water (CW) pumps (1/2P-30A and 1/2P-30B) and replaced one (1) Unit 2 CW pump motor (2P-30A-M).

The 10 CFR 50.59 Screenings performed in support of these modifications (SCR 2010-0201 for Unit 1 and SCR 2011-0234 for Unit 2), concluded a 10CFR50.59 Evaluation be performed to evaluate the hydraulic characteristics of the replacement pumps. Summary of Evaluation:

The replacement CW pumps have a flat area on their head-capacity curves, where operation of the pumps should be avoided. During normal plant operation, the replacement pumps will operate away from the flat area in a reliable, predictable and stable manner. However, heavy fouling within the CW system has the potential to add sufficient resistance to the CW system such that CW pump operation may shift to the flat area of the head-capacity curve. This, in turn, could result in unstable operation of the CW pumps and unreliable operation of the generator resulting in a plant transient.

To minimize the potential for unstable CW pump operation, an additional CW pump trip criterion was added to plant operating procedures to supplement existing manual CW pump trip criteria.

The new criterion is to manually trip a CW pump, when two pumps are operating per Unit, at the onset of significant fouling of the traveling water screens (4ft level differential between the pump house forebay and pump bay). Operational alignment that isolates a condenser water box with two CW pumps operating was also prohibited to prevent unstable CW pump operation.

A new administrative activity was established to perform system monitoring to identify the degree of fouling that occurs during an operating cycle.

Conclusion:

Operating procedure revisions and administrative activities were implemented for the replacement CW pumps. Manual CW pump trip is not credited in the safety analyses.

Operation of the replacement CW pumps will not result in more than a minimal increase in the frequency of previously evaluated accidents or more than a minimal increase in the likelihood of a malfunction of SSCs important to safety. The modifications will not increase in consequences of previously evaluated accidents or malfunctions of SSCs important to safety. The replacement CW pumps will not create the possibility for new accidents or the possibility of malfunctions of SSCs important to safety. The replacement CW pumps do not affect design basis limits for fission product barriers or depart from a method of evaluation described in the Current Licensing Basis. [EVAL 2011-009-001]

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