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On 8/14/2009 at 19:58, the Unit 1 High Pre … On 8/14/2009 at 19:58, the Unit 1 High Pressure Coolant Injection (HPCI) System inboard isolation valves automatically isolated. Inboard isolation was caused by an inadvertent high ambient temperature signal from the HPCI steam leak detection module. Local temperatures were confirmed to be normal and no steam leak was identified. With the HPCI system steam supply isolated, the HPCI system is inoperable in accordance with Technical Specification 3.5.1. HPCI is a single-train safety function system. </br>The initial safety significance of this condition is considered to be minimal. The Reactor Core Isolation Cooling (RCIC) system, Automatic Depressurization System (ADS), and Low Pressure Emergency Core Cooling systems (ECCS) remain operable at this time. Actions have been taken to protect redundant safety systems. Unit 1 risk condition is currently yellow due to the concurrent inoperability of a single loop of Residual Heat Removal (RHR) Service Water for system maintenance.</br>The HPCI system remains isolated and inoperable pending further troubleshooting of the inboard isolation.</br>The NRC resident has been notified.ation.
The NRC resident has been notified. +
23:58:00, 14 August 2009 +
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00:51:00, 15 August 2009 +
23:58:00, 14 August 2009 +
On 8/14/2009 at 19:58, the Unit 1 High Pre … On 8/14/2009 at 19:58, the Unit 1 High Pressure Coolant Injection (HPCI) System inboard isolation valves automatically isolated. Inboard isolation was caused by an inadvertent high ambient temperature signal from the HPCI steam leak detection module. Local temperatures were confirmed to be normal and no steam leak was identified. With the HPCI system steam supply isolated, the HPCI system is inoperable in accordance with Technical Specification 3.5.1. HPCI is a single-train safety function system. </br>The initial safety significance of this condition is considered to be minimal. The Reactor Core Isolation Cooling (RCIC) system, Automatic Depressurization System (ADS), and Low Pressure Emergency Core Cooling systems (ECCS) remain operable at this time. Actions have been taken to protect redundant safety systems. Unit 1 risk condition is currently yellow due to the concurrent inoperability of a single loop of Residual Heat Removal (RHR) Service Water for system maintenance.</br>The HPCI system remains isolated and inoperable pending further troubleshooting of the inboard isolation.</br>The NRC resident has been notified.ation.
The NRC resident has been notified. +
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100 +
00:00:00, 15 August 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>.
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23:58:00, 14 August 2009 +
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