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At 1834 hours on 7/14/10, the Unit 1 'C' R … At 1834 hours on 7/14/10, the Unit 1 'C' Reactor Coolant Loop was declared inoperable due to small unisolable leaks on the 'C' Steam Generator secondary side surface sample line. Two small through-wall flaws were identified in the piping upstream of 1 -SS-217, 'C' Steam Generator surface sample line manual isolation valve. The piping is Class 2 and the non-conforming condition could not be evaluated with the steam generator pressurized. Based on the condition of the piping and the inability to evaluate the flaw, the 'C' Steam Generator was declared inoperable per Technical Requirements Manual 3.4.6, ASME Code Class 1, 2 and 3 Components. Subsequently, Technical Specification 3.4.4 was entered to place Unit 1 in Mode 3 within 6 hours.</br>At 1934 hours on 7/14/10, North Anna Unit 1 initiated a shutdown in accordance with Technical Specification 3.4.4. The unit will be shutdown and the line will be evaluated and repaired.</br>The licensee is presently at 82% power and coasting down in power. All safety systems are fully operable.</br>The licensee has notified the NRC Resident Inspector.</br>* * * UPDATE FROM PAUL TRENT TO DONALD NORWOOD AT 0015 HRS ON 7/15/2010 * * *</br>North Anna Unit 1 entered mode 3 at 2353 hrs. There were no complications during shutdown. One source range monitor failed downscale low. The other source range monitor is operating correctly. The failure of this source range monitor did not affect shutdown capabilities.</br>Notified R2DO (Seymour).own capabilities.
Notified R2DO (Seymour). +
23:34:00, 14 July 2010 +
19:53:00, 14 July 2010 +
23:34:00, 14 July 2010 +
At 1834 hours on 7/14/10, the Unit 1 'C' R … At 1834 hours on 7/14/10, the Unit 1 'C' Reactor Coolant Loop was declared inoperable due to small unisolable leaks on the 'C' Steam Generator secondary side surface sample line. Two small through-wall flaws were identified in the piping upstream of 1 -SS-217, 'C' Steam Generator surface sample line manual isolation valve. The piping is Class 2 and the non-conforming condition could not be evaluated with the steam generator pressurized. Based on the condition of the piping and the inability to evaluate the flaw, the 'C' Steam Generator was declared inoperable per Technical Requirements Manual 3.4.6, ASME Code Class 1, 2 and 3 Components. Subsequently, Technical Specification 3.4.4 was entered to place Unit 1 in Mode 3 within 6 hours.</br>At 1934 hours on 7/14/10, North Anna Unit 1 initiated a shutdown in accordance with Technical Specification 3.4.4. The unit will be shutdown and the line will be evaluated and repaired.</br>The licensee is presently at 82% power and coasting down in power. All safety systems are fully operable.</br>The licensee has notified the NRC Resident Inspector.</br>* * * UPDATE FROM PAUL TRENT TO DONALD NORWOOD AT 0015 HRS ON 7/15/2010 * * *</br>North Anna Unit 1 entered mode 3 at 2353 hrs. There were no complications during shutdown. One source range monitor failed downscale low. The other source range monitor is operating correctly. The failure of this source range monitor did not affect shutdown capabilities.</br>Notified R2DO (Seymour).own capabilities.
Notified R2DO (Seymour). +
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00:00:00, 15 July 2010 +
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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23:34:00, 14 July 2010 +
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