ENS 46175
ENS Event | |
|---|---|
05:45 Aug 15, 2010 | |
| Title | Ts Required Shutdown Entered Due to High Containment Temperature |
| Event Description | Due to failure of Service Water from RCP Motor Air Cooler valve MOV3134 to stroke satisfactorily during scheduled surveillance testing, [the licensee] entered TS 3.6.3 Condition A for Containment Isolation Valves. MOV3134 did not indicate full closed by remote indication in the Control Room when time-stroked at 0119, 8/14/10. Consequently, the isolation valve inside containment, MOV3131, was closed and deenergized to provide containment isolation. This isolated a source of Service Water cooling for containment, and the average temperature of containment started trending up from 117.5F at 0000, 8/14/10. At 1400, 8/14/10, containment average temperature exceeded 120F and entry into TS 3.6.5 Condition A was required. At 2200, 8/14/10, containment average temperature had not been restored to [less than or equal to] 120F, and TS 3.6.5 Condition B was entered. To ensure compliance with TS 3.6.5 Condition B, a ramp down to MODE 3 was initiated at 0045, 8/15/10.
At 0057, 8/15/10, the NRC authorized enforcement discretion for Farley Nuclear Plant Unit 1 with regard to LCO 3.6.5 and containment temperature in excess of 120F. The ramp down was halted and power stabilized at 96% Rx power. The enforcement discretion duration is 18 hours2.083333e-4 days <br />0.005 hours <br />2.97619e-5 weeks <br />6.849e-6 months <br /> starting from 2200, 8/14/10. There were two stipulations on the discretion: 1. If the LLRT [Local Leak Rate Test] on MOV3134 fails, a controlled shutdown will be initiated. Time from the enforcement discretion will be used as necessary to achieve a controlled shutdown. 2. If containment average temperature exceeds 122F, a controlled shutdown will be initiated. Time from the enforcement discretion will be used as necessary to achieve a controlled shutdown. An update will be sent if a ramp down is recommenced. There is no radiological release in progress. The licensee will notify the NRC Resident Inspector.
The LLRT of valve MOV3134 was completed satisfactorily at 0500 CDT on 8/15/10. The valve was declared OPERABLE (but degraded due to the need for additional limit switch and/or torque switch adjustments that do not affect its isolation capability). At 0800 CDT, service water cooling flow was re-established to the RCP Motor Air Coolers. The current containment temperature is 120.4 degrees Fahrenheit. The licensee plans to remain at 96% power until containment temperature drops below 120 degrees. The licensee has notified the NRC Resident Inspector. R2DO (Rudisail) notified. |
| Where | |
|---|---|
Farley  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| LER: | 05000348/LER-2010-003 |
| Time - Person (Reporting Time:+-1.5 h-0.0625 days <br />-0.00893 weeks <br />-0.00205 months <br />) | |
| Opened: | John Lewis 04:15 Aug 15, 2010 |
| NRC Officer: | Dong Park |
| Last Updated: | Aug 15, 2010 |
| 46175 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (96 %) |
WEEKMONTHYEARENS 523742016-11-18T00:59:00018 November 2016 00:59:00
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