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On December 22, 2009, at 0845 hours, with … On December 22, 2009, at 0845 hours, with the reactor at 100% core thermal power and steady state conditions, Pilgrim Nuclear Power Station (PNPS) declared Secondary Containment inoperable due to the loss of a water seal on two 14 inch drain lines in the Torus Compartment designed to mitigate the consequences of a flood in the Reactor Auxiliary Bay. An initial assessment of the condition indicates that the cross-sectional area of pipes, as found, have the potential to exceed the analytical value of allowable Secondary Containment leakage pathway size documented in the design calculations. The Limiting Condition for Operation (LCO) for Technical Specification (TS) 3.7.C.2.a, was immediately entered at 0845 until the condition was corrected. The TS LCO was subsequently exited at 0945 hours at which time Secondary Containment was declared operable.</br>As background, each Reactor Auxiliary Bay (2) is equipped with a sump containing two 14 inch drain lines that discharge into separate trough in the Torus Compartment in the event of a flooding condition. The trough is approximately 4 feet by 4 feet by 4 feet deep and is equipped with a high and low level alarm which annunciates in the Control Room. One of the functions of the alarm is to indicate a low level condition prior to the pipes losing their water seal which maintains Secondary Containment for those penetrations. When the water level in the trough dropped below the low level setpoint, the alarm failed to annunciate. This condition was discovered during an engineering walk down of the Torus Compartment.</br>Immediate actions taken were to refill the trough to the correct level, initiate repairs to the level switch, which was found to be defective, and to enhance the weekly tour requirement of the Torus Compartment performed by plant operations.</br>This notification has no impact on the health and safety of the public.</br>The NRC Resident Inspector is onsite and has been notified.</br>This is an 8 hour notification made in accordance with 50.72(b)(3)(v)(C).made in accordance with 50.72(b)(3)(v)(C).
13:45:00, 22 December 2009 +
45,586 +
16:30:00, 22 December 2009 +
13:45:00, 22 December 2009 +
On December 22, 2009, at 0845 hours, with … On December 22, 2009, at 0845 hours, with the reactor at 100% core thermal power and steady state conditions, Pilgrim Nuclear Power Station (PNPS) declared Secondary Containment inoperable due to the loss of a water seal on two 14 inch drain lines in the Torus Compartment designed to mitigate the consequences of a flood in the Reactor Auxiliary Bay. An initial assessment of the condition indicates that the cross-sectional area of pipes, as found, have the potential to exceed the analytical value of allowable Secondary Containment leakage pathway size documented in the design calculations. The Limiting Condition for Operation (LCO) for Technical Specification (TS) 3.7.C.2.a, was immediately entered at 0845 until the condition was corrected. The TS LCO was subsequently exited at 0945 hours at which time Secondary Containment was declared operable.</br>As background, each Reactor Auxiliary Bay (2) is equipped with a sump containing two 14 inch drain lines that discharge into separate trough in the Torus Compartment in the event of a flooding condition. The trough is approximately 4 feet by 4 feet by 4 feet deep and is equipped with a high and low level alarm which annunciates in the Control Room. One of the functions of the alarm is to indicate a low level condition prior to the pipes losing their water seal which maintains Secondary Containment for those penetrations. When the water level in the trough dropped below the low level setpoint, the alarm failed to annunciate. This condition was discovered during an engineering walk down of the Torus Compartment.</br>Immediate actions taken were to refill the trough to the correct level, initiate repairs to the level switch, which was found to be defective, and to enhance the weekly tour requirement of the Torus Compartment performed by plant operations.</br>This notification has no impact on the health and safety of the public.</br>The NRC Resident Inspector is onsite and has been notified.</br>This is an 8 hour notification made in accordance with 50.72(b)(3)(v)(C).made in accordance with 50.72(b)(3)(v)(C).
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100 +
00:00:00, 22 December 2009 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
02:10:35, 2 March 2018 +
16:30:00, 22 December 2009 +
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0.115 d (2.75 hours, 0.0164 weeks, 0.00377 months) +
13:45:00, 22 December 2009 +
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