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| {{Adams
| | #REDIRECT [[05000369/LER-2011-001, Regarding Shutdown of Two Units Due to Entry Into LCO 3.0.3 Caused by the Inoperability of All Four Trains of the Nuclear Service Water System Due to Strainer Macro-Fouling]] |
| | number = ML111020305
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| | issue date = 04/01/2011
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| | title = Regarding Shutdown of Two Units Due to Entry Into LCO 3.0.3 Caused by the Inoperability of All Four Trains of the Nuclear Service Water System Due to Strainer Macro-Fouling
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| | author name = Repko R
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| | author affiliation = Duke Energy Carolinas, LLC
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| | addressee name =
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| | addressee affiliation = NRC/Document Control Desk, NRC/NRR
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| | docket = 05000369, 05000370
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| | license number = NPF-009, NPF-017
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| | contact person =
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| | case reference number = M-11-00329
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| | document report number = LER 11-001-01
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| | document type = Letter, Licensee Event Report (LER)
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| | page count = 15
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| }}
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| {{LER
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| | Title = Regarding Shutdown of Two Units Due to Entry Into LCO 3.0.3 Caused by the Inoperability of All Four Trains of the Nuclear Service Water System Due to Strainer Macro-Fouling
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| | Plant =
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| | Reporting criterion = 10 CFR 50.73(a)(2)(i)(B), 10 CFR 50.73(a)(2)(v)(B)
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| | Power level =
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| | Mode =
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| | Docket = 05000369
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| | LER year = 2011
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| | LER number = 1
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| | LER revision = 1
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| | Event date =
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| | Report date =
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| | ENS =
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| | abstract =
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| }}
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| =text=
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| {{#Wiki_filter:REGIS T. REPKO Duke Vice President E Energy McGuire Nuclear Station Duke Energy MG01VP /12700 Hagers Ferry Rd.
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| Huntersville, NC 28078 980-875-4111 980-875-4809 fax regis. repko@duke-energy. corn April 1, 2011 U.S. Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, D.C. 20555
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| ==Subject:==
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| Duke Energy Carolinas, LLC McGuire Nuclear Station, Units 1 and 2 Docket No. 50-369, 50-370 Licensee Event Report 369/2011-01, Revision 1 Problem Investigation Process Number M-1 1-00329 Pursuant to 10 CFR 50.73 Sections (a) (1) and (d), attached is Licensee Event Report (LER) 369/2011-01, Revision 0, regarding the shutdown of both McGuire operating Units due to entry into Technical Specification Limiting Condition for Operation 3.0.3, caused by the inoperability of all four trains of the Nuclear Service Water (RN) System as a result of RN strainer macro-fouling. This event was originally reported on March 21, 2011. Revision 1 is being submitted at this time to provide the NRC with additional details regarding the dates of vulnerability of RN System macro-fouling.
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| This report is being submitted in accordance with 10 CFR 50.73 (a) (2) (i) (B), an operation prohibited by Technical Specifications and 10 CFR 50.73 (a) (2) (v) (B), any event or condition that could have prevented fulfillment of the safety function.
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| The completion of the Unit 1 and Unit 2 nuclear plant shutdowns and the resultant Unit 1 Reactor Protection System actuation is being reported separately under McGuire LER 369/2011-02.
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| This event is considered to be of no significance with respect to the health and safety of the public. There are no regulatory commitment's contained in this LER.
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| If questions arise regarding this LER, contact Lee A. Hentz at 980-875-4187.
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| Sincerely, Regis T. Repko Attachment www. duA e-energy. corn
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| U.S. Nuclear Regulatory Commission April 1, 2011 Page 2 cc:
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| V. M. McCree, Regional Administrator U.S. Nuclear Regulatory Commission, Region II Marquis One Tower 245 Peachtree Center Ave., NE, Suite 1200 Atlanta, Georgia 30303-1257 Jon H. Thompson (Addressee Only)
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| Senior Project Manager (McGuire)
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| U.S. Nuclear Regulatory Commission 11555 Rockville Pike Rockville, MD 20852-2738 J. B. Brady Senior Resident Inspector U.S. Nuclear Regulatory Commission McGuire Nuclear Station W. L. Cox Ill, Section Chief North Carolina Department of Environment and Natural Resources Division of Environmental Health Radiation Protection Section 1645 Mail Service Center Raleigh, NC 27699-1645
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| =Abstract=
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| Unit Status: At the time of the event, Units 1 and 2 were in Mode 1 at 100% power.
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| ==Event Description==
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| On January 18, 2011, during testing of the lB Nuclear Service Water (RN) pump while aligned to the Standby Nuclear Service Water Pond (SNSWP),
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| its associated strainer became fouled with small, bluegill fish.
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| After further investigation and testing, it was determined that both RN trains on each Unit were potentially inoperable due to macro-fouling from the SNSWP.
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| Both Units entered TS LCO 3.0.3 and initiated shutdowns.
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| McGuire requested and received a Notification of Enforcement Discretion (NOED) for both Units to remain in Mode 3 until the macro-fouling source was eliminated.
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| ==Event Cause==
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| The causes of this event were lack of an effective macro fouling barrier in the SNSWP, deferral of the fish eradication treatment of the SNSWP in 2010, and lack of risk recognition.
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| ==Corrective Actions==
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| The SNSWP was chemically treated to eliminate the macro-fouling source and the RN intake lines were flushed.
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| A periodic chemical treatment was established and a macro-fouling barrier modification is planned.
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| NRC FORM 366 (10-2010)
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| (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A) was performed after the 1B and 2B RN Strainers had been cleaned and restored to service, and before the Rotenone was applied to the SNSWP.
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| In the above alignment, the reverse flow from the A Train suction piping to the SNSWP intake was drawn into the B Train that was aligned and operating only on the SNSWP.
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| This has been verified by the temperature transient on the B Train Essential Header supply temperature during this operation.
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| The temperature transient confirms that the warmer water in the previously stagnant A Train suction piping was drawn into the B Train piping.
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| This would have included any bluegill fish if they had been present in the piping.
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| The B Train RN Strainers differential pressure response during this alignment shows that there was no significant fouling of either the 1B or 2B RN Strainers, as the differential pressure changed less than 0.1 psid during this evolution; therefore there were no bluegill fish in the A Train suction piping.
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| In summary, the B RN Train suction piping was verified clean on January 20, 2011 with the restoration of lB and 2B RN Strainers.
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| The A RN Train was not affected by bluegill fish as evidenced by the January 21, 2011 RN B Train Strainer backwashes.
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| Recurring Event Evaluation The 2011 RN strainer macro-fouling event is not considered recurring.
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| Although there have been previous macro-fouling challenges to the RN strainers, notably the July 2007 and April 2009 events, these events did not overwhelm the strainers (with backwash in service) rendering the RN system inoperable.
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| To determine if a recurring or similar event exists, a search of the McGuire Problem Identification Process (PIP) database was conducted for a time period covering 5 years prior to the date of this event.
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| Based on Duke Energy's definition of a recurring event, similar significant event with the similar event and cause codes; no recurring events were identified associated with macro-fouling of important raw water systems at McGuire.
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| }}
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| {{LER-Nav}}
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