ENS 45289
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ENS Event | |
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18:15 Aug 24, 2009 | |
Title | Station Safety Grade Pneumatic Supply Issue |
Event Description | This event is being reported pursuant to the requirements of 10 CFR 50.72(b)(3)(v) as an event or condition that at the time of discovery could have prevented the fulfillment of the safety function of systems supplied by the station safety-grade pneumatic supply. The systems affected include the primary containment isolation valves (i.e., large primary containment isolation valve boot seals) and the reactor-building to suppression pool vacuum breakers.
On 8/24/09 at 1330, while troubleshooting the receipt of unexpected alarms during containment valve stroking the previous week, Exelon personnel discovered a valve closed instead of the expected open position. Licensed personnel concluded at 1415 that the out of position valve was restricting the Containment Atmospheric Dilution tank from supplying operating nitrogen to the Safety Grade Instrument Gas (SGIG) system headers for Peach Bottom Units 2 and 3. The valve was re-opened at 1445 (within the one hour action time required by Technical Specifications) and other system valves were verified to be in the required positions. The licensee notified the NRC Resident Inspector. |
Where | |
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Peach Bottom ![]() Pennsylvania (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+3.1 h0.129 days <br />0.0185 weeks <br />0.00425 months <br />) | |
Opened: | Jason Murphy 21:21 Aug 24, 2009 |
NRC Officer: | Pete Snyder |
Last Updated: | Aug 24, 2009 |
45289 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 3 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (95 %) |
After | Power Operation (95 %) |
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