05000327/FIN-2008004-01
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Finding | |
|---|---|
| Title | Notice of Enforcement Discretion 08-2-001 For Both Control Room Air Conditioning System Trains Inoperable |
| Description | On September 26, 2008, TVA requested the NRC exercise discretion to not enforce compliance with the actions required in Sequoyah Nuclear Plant, Units 1 and 2, TS LCO 3.0.5. The NRC granted the request to exercise discretion. On September 25, 2008, at 10:55 p.m., a failure of the motor for the B train MCR air handling unit (AHU) caused the B train of control room air conditioning system (CRACS) to be inoperable. TS LCO 3.7.15 required two independent CRACS trains to be operable. Due to scheduled maintenance on the 1A EDG, the A train of CRACS was also inoperable at this time solely due to its emergency backup power supply being inoperable. Under these conditions, TS LCO 3.0.5 required that action be initiated within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> to place both Units 1 and 2 in hot standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. On September 26, 2008, at 4:04 a.m., the NRC verbally granted the request to extend the 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> time requirement to be in hot standby by an additional 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />, based in part on the 1A EDG being in a functional condition pending the verification of the parameters required for TS operability. At 2:00 p.m. on September 26, 2008, the 1A EDG was declared operable, and the NOED was exited. In response to this issue, the inspectors verified that the licensee protected equipment, as discussed with the NRC, and that the functional determination of the 1A EDG was valid. The licensee entered this condition into their corrective action program as PER 153304. Pending the licensees completion of the apparent cause evaluation, LER submittal, and the NRCs review of the circumstances and the evaluation, this issue is considered as Unresolved Item (URI) 05000327,328/2008004-01, Notice of Enforcement Discretion 08-2-001 for Both Control Room Air Conditioning System Trains Inoperable |
| Site: | Sequoyah  |
|---|---|
| Report | IR 05000327/2008004 Section 4OA3 |
| Date counted | Sep 30, 2008 (2008Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | E Michel E Guthrie C Young M Speckh Gepfordr Moore R Aiello C Young M Speck D Mas-Penaranda B Caballero C Even J Hamman J Eargle P Braxton |
| INPO aspect | |
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Finding - Sequoyah - IR 05000327/2008004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Sequoyah) @ 2008Q3
Self-Identified List (Sequoyah)
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