05000413/LER-2002-001, Both Trains of Control Room Area Chilled Water System Were Inoperable Simultaneously as a Result of Inadequate Troubleshooting Follow-up
| ML021280367 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 04/24/2002 |
| From: | Gordon Peterson Duke Power Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER 02-001-00 | |
| Download: ML021280367 (10) | |
| Event date: | |
|---|---|
| Report date: | |
| 4132002001R00 - NRC Website | |
text
Duke Duke Power Pd~owere4800 Concord Rd.
SS~owersYork, SC 29710 A Duke Energy Company (0
251 O
(803) 831-4251 oFFicE (803) 831-3221 FAx Gary R. Peterson grpeters@duke-energy.com Vice President Catawba Nuclear Station April 24, 2002 U.S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C. 20555
Subject:
Catawba Nuclear Station, Units 1 and 2 Docket Nos. 50-413 and 50-414 Licensee Event Report 413./02-001 Attached is Licensee Event Report 413/02-001 titled "Both Trains of Control Room Area Chilled Water System Were Inoperable Simultaneously as a Result of Inadequate Troubleshooting Follow-Up.1" There are no regulatory commitments contained in this letter or its attachment.
This event is considered to be of no significance with respect to the health and safety of the public.
If there are any questions on this report, please contact L.J. Rudy at (803) 831-3084.
Sincerely, Gary R. Peterson Attachment
Document Control Desk Page 2 April 24, 2002 xc (with attachment):
Mr. Luis A. Reyes Regional Administrator, Region II U.S. Nuclear Regulatory Commission 61 Forsyth Street, S.W., Suite 23T85 Atlanta, GA 30303 Mr. Chandu P. Patel (addressee only)
U.S. Nuclear Regulatory Commission Mail Stop 08-H12 11555 Rockville Pike Rockville, MD 20852-2738 Mr. Darrell J. Roberts NRC Senior Resident Inspector Catawba Nuclear Station INPO Records Center 700 Galleria Place Atlanta, GA 30339-5957 Marsh & McLennan, Inc.
Mr. Kenneth W. Gannaway 100 N. Tryon Street Charlotte, NC 28202
Abstract
From February 24, 2002 at 1735 hours0.0201 days <br />0.482 hours <br />0.00287 weeks <br />6.601675e-4 months <br /> until February 27, 2002 at 2255 hours0.0261 days <br />0.626 hours <br />0.00373 weeks <br />8.580275e-4 months <br />, both trains of the Control Room Area Chilled Water System (CRACWS) were inoperable simultaneously, resulting in Units 1 and 2 being unknowingly in Technical Specification (TS) 3.0.3.
At the time, CRACWS Train B was out of service for preventive maintenance.
It was retroactively determined that during the early morning hours of February 21, 2002, the CRACWS Train A chiller had become inoperable due to relay leads that had loosened over time and had made intermittent contact.
The leads eventually disconnected.
The problem with the leads was not identified prior to taking CRACWS Train B out of service as a result of inadequate troubleshooting follow-up.
This event resulted in a violation of TS 3.0.3, as well as a violation of TS 3.7.11 for the CRACWS.
Corrective actions taken in response to this event include communicating the troubleshooting aspects of this event to appropriate station personnel so that suspected problem causes are validated prior to considering equipment operable.
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 NRC Forn 366A) (17) 2/27/02/1857 2/27/02/2255 2/27/02/2326 2/28/02/Dayshift 2/28/02/1557 2/28/02/Dayshift 2/28/02/1948 2/28/02/Nightshift 2/28/02/2218 2/28/02/2333 3/5/02 CRACWS Train B chiller was started for functional verification and CRACWS Train A chiller was shut down.
Critical trouble annunciator for CRACWS Train A chiller would not clear.
A work request was initiated to investigate.
CRACWS Train B chiller was declared operable.
CRACWS Train A chiller was started.
Critical trouble annunciator cleared.
Personnel inspected CRACWS Train A chiller; found cooler low flow light energized; relay K106 was observed to be deenergized.
CRACWS Train A chiller was shut down for troubleshooting.
Personnel found disconnected wiring on relay K101 for CRACWS Train A chiller.
CRACWS Train A chiller was declared inoperable for repair.
Personnel initiated work request to inspect CRACWS Train B chiller for loose wiring.
Personnel completed inspection of CRACWS Train A chiller for other loose wiring.
No other terminal screws were discovered backed off by more than approximately one-quarter turn.
CRACWS Train A chiller was started.
CRACWS Train A chiller was declared operable.
Personnel completed inspection of CRACWS Train B chiller for loose wiring.
No terminal screws were discovered backed off by more than approximately one-quarter turn.
NRC; (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) (17)
Figure la CRACWS Chiller Control Circuitry (Chiller Running/Normal Operation)
Figure lb CRACWS Chiller Control Circuitry (Chiller Running/As-Found 2/21/02) 120 VAC 120 VAC 1
l 2
3 4
2 3
4 5
5 Chiller Start Circuitry Chiller Start Circuitry
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