Browse wiki
Jump to navigation
Jump to search
The inspectors identified that Pacific Gas … The inspectors identified that Pacific Gas and Electric provided the NRC control room envelope in-leakage test results that were inconsistent with plant testing records. Generic Letter 2003-01, Control Room Habitability, requested that the licensee verify that the most limiting unfiltered in-leakage into the control room envelope was no more than the value assumed in the design basis radiological analyses. The Diablo Canyon radiological analyses assumed zero in-leakage into the envelope and concluded that operators would receive the 5 rem equivalent regulatory limit established by General Design Criteria 19, Control Room. In response to the Generic Letter, the licensee performed Control Room Habitability Tracer Gas Leak Testing of the Diablo Canyon Power Plant, in January 2005. The licensee reported to the NRC that the test resulted in no unfiltered in-leakage (Pacific Gas and Electric Letter DCL-05-042, April 22, 2005, Control Room Envelope In-Leakage Test Results Relative to Generic Letter 2003-01, Control Room Habitability ); however, the available documentation of the actual test results did not provide a valid technical basis for this conclusion. On December 26, 2007, Pacific Gas and Electric submitted License Amendment Request 07-03 (Letter DCL-07-144, Revision to Technical Specification 3.7.10, Control Room Ventilation System ) to the NRC for approval. The licensee\\\'s technical justification included the successful tracer gas test conducted in January 2005. On December 23, 2008, the NRC approved the request as Licensee Amendments 201 and 202. These amendments established License Condition C.12 for control room ventilation, Technical Specification 5.5.19, Control Room Envelope Habitability Program, and modified Technical Specification 3.7.10, Control Room Ventilation System. NRC approval was based, in part, on the licensee\\\'s statement that measured unfiltered air in-leakage was less than or equal to the in-leakage value assumed in the control room dose analysis. On September 12, 2011, the licensee declared the control room envelope inoperable. The licensee plans to re-perform the in-leakage tracer gas test in November 2011. This issue is unresolved pending additional NRC review of the control room in-leakage test results: Unresolved Item 05000275; 05000323/2011004-02, Inconsistent Control Room In-Leakage Tests Results Reported to the NRC.Leakage Tests Results Reported to the NRC.
23:59:59, 30 September 2011 +
23:59:59, 30 September 2011 +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 +, 05000275/FIN-2011004-02 + and 05000275/FIN-2011004-02 +
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>.
04:17:20, 22 February 2018 +
23:59:59, 30 September 2011 +