ENS 48868
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ENS Event | |
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08:14 Mar 31, 2013 | |
Title | Rcs Flow Instrument Line Through Wall Weld Defect |
Event Description | On 3/31/13 at 0414 EDT, dye penetrant testing identified a 10mm long relevant linear indication on a 3/4 inch RCS flow instrument line weld, between the RCS loop piping and the instrument isolation valve. This constitutes a weld defect in the primary coolant system that cannot be found acceptable per ASME Section XI. This section of piping is unisolable from the Reactor Coolant System. There is no evidence of active leakage currently or during the previous operating cycle, however, based on the dye penetrant testing this is considered a through wall leak.
This event notification is being made in accordance with 10CFR50.72(b)(3)(ii)(A), as a condition that results in the condition of the nuclear power plant, including its principal safety barriers, being seriously degraded. Unit 1 is currently in a scheduled refueling outage in Mode 5 making preparations to transition to Mode 6. The plant is evaluating the appropriate repair method for this condition. The condition will be corrected during the current refueling outage. Unit 2 is in Mode 1 at 100% power and is unaffected by this condition. The NRC Resident Inspector has been notified. |
Where | |
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Cook ![]() Michigan (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
Time - Person (Reporting Time:+0.9 h0.0375 days <br />0.00536 weeks <br />0.00123 months <br />) | |
Opened: | Gregory Kanda 09:08 Mar 31, 2013 |
NRC Officer: | Donald Norwood |
Last Updated: | Mar 31, 2013 |
48868 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Not Critical |
Scram | No |
Before | Cold Shutdown (0 %) |
After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 488682013-03-31T08:14:00031 March 2013 08:14:00
[Table view]10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Rcs Flow Instrument Line Through Wall Weld Defect ENS 441712008-04-26T02:10:00026 April 2008 02:10:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Non-Isolable Rcs Boundary Leakage from Instrument Line 2013-03-31T08:14:00 | |
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