05000369/LER-2009-001, For McGuire Nuclear, Unit 1, Regarding Nuclear Service Water System (Nsws) a Trains Past Inoperable When Aligned to the Standby Nuclear Service Water Pond (Snswp) Due to Corrosion
| ML091820327 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 06/24/2009 |
| From: | Hamiton B Duke Energy Carolinas, Duke Energy Corp |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| M-09-02216 LER 09-001-00 | |
| Download: ML091820327 (10) | |
| Event date: | |
|---|---|
| Report date: | |
| 3692009001R00 - NRC Website | |
text
BRUCE H HAMILTON Vice President Poklnergy McGuire Nuclear Station Duke Energy Corporation MGO1 VP /12700 Hagers Ferry Road Huntersvyule, NC 28078 704-875-5333 704-875-4809 fax bhhamilton@duke-energy. corn June 24, 2009 U.S. Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, D.C.
20555
Subject:
Duke Energy Carolinas, LLC McGuire Nuclear Station, Units 1 and 2 Docket Nos.
50-369, 50-370 Licensee Event Report 369/2009-01, Revision 0 Problem Investigation Process (PIP) M-09-02216 Pursuant to 10 CFR 50.73 Sections (a)
(1) and (d),
attached is Licensee Event Report 369/2009-01, Revision 0, regarding the past inoperability of the Nuclear Service Water System "A"
Trains due to potential for strainer fouling.
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.
This event is considered to be of no significance with respect to the health and safety of the public.
There are no regulatory commitments contained in this LER.
If questions arise regarding this LER, contact Rick Abbott at 980-875-4685.
Very truly yours, Bruce H. Hamilton Attachment www.duke-energy.com jAJ(Lv.
U.S. Nuclear Regulatory Commission Date Page 2 cc:
L.
A.
Reyes, Regional Administrator U.S. Nuclear Regulatory Commission, Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW, Suite 23T85
- Atlanta, GA 30303 J.
H. Thompson, Jr. (Addressee Only)
Senior Project Manager (McGuire)
U.S. Nuclear Regulatory Commission Mail Stop O-8G9A Washington, DC 20555 J.
B. Brady Senior Resident Inspector U.S. Nuclear Regulatory Commission McGuire Nuclear Station B. 0. Hall, Section Chief Radiation Protection Section 1645 Mail' Service Center,
- Raleigh, NC 27699
1*
Abstract
Unit Status: Unit 1 and Unit 2 were in Mode 1 at 100% power.
Event Description
On April 27, 2009, the Unit 1 "A" (1A) and Unit 2 "A" (2A)
NSWS Trains suctions were realigned to the SNSWP, the automatic backwash function of the strainers upstream of the pumps was disabled and the pumps were declared inoperable as prerequisites to perform testing.
During the test, unexpected fouling of the 2A NSWS Strainer was caused by corrosion products which collected on the strainer and resulted in reduced 2A RN train flow rate. A subsequent evaluation of this condition determined operator actions specified for strainer fouling were not considered time critical and would not have assured previous "A" Train NSWS pump operability for loss of Instrument Air events and "A" Trains pump suction are also manually realigned to the SNSWP.
Event Cause
Corrosion products accumulated on the surface of the "A" Trains SNSWP pump suction header piping due to an inadequate frequency, duration and flow rate specified in the periodic flush procedure.
Corrective Actions
Immediate action was taken to assure "A" Trains NSWS operability if "A"
Train is required to be manually aligned to the SNSWP.
Actions will be taken to revise the flush procedure.
NRC FORM 366 (7-2001)
(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)
In
- 2007, a similar event occurred as documented in Problem IdentifiCation M-07-04313, "Inability to manually backwash RN strainers during post-accident conditions." This event was caused by macro fouling due to alewife fish intrusion and questioned the ability to manually backwash the NSWS Strainers in the event of an accident.
Fouling from corrosion products was not evaluated in this report; however, the site did evaluate fouling from macro-fouling sources in the SNSWP.
NRC b'URM 366AX (ý)-2UU/)