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During a Unit 1 containment walkdown the i … During a Unit 1 containment walkdown the inspectors identified a boric acid leak on sample valve 1PS9365B located on the 426 elevation. The 426 elevation of containment utilized floor grating; therefore the inspectors inspected the lower levels of containment to determine if any other equipment had been impacted by the leak. On the 377 elevation, the inspectors identified a large area of boric acid accumulation. The inspectors subsequently made the licensee staff aware of this additional boric acid accumulation. Photographs were subsequently taken by the licensee and provided to the Outage Control Center. The licensee entered this issue into their CAP as IR 1339957, 1PS9365 Has Leak From Either Packing or Bonnet. In preparation for a Mode 5 to Mode 4 change, the licensee was required to perform an inspection and assessment of containment in accordance with 1BOSR Z.5.b.1-1, Unit 1 Containment Loose Debris Inspection, to ensure that the material condition of containment was adequate to support at-power operations. The inspectors performed an independent inspection following the licensees inspection and assessment. During this independent inspection, the inspectors identified that boric acid associated with boric acid leakage on the 377 elevation documented in IR 1339957 was still present. Specifically, boric acid had accumulated in a trough that was located along the wall of the inner containment structure. The accumulated boric acid completely covered the drain located in the trough. The purpose of this trough was to collect any potential leakage and direct that leakage to a drain that led to a sump. The flow of water into the sump as well as the level of this sump was monitored to facilitate the prompt identification of containment leakage. The leakage detection instrumentation for the RCS was required to be operable in Modes 1-4. Unit 1 was in Mode 4 at the time of this discovery. This issue was entered into the licensees CAP as IR 1341380, NRC Identified Boric Acid Covering Floor. The impact of this issue on the leakage detection instrumentation was still being assessed by the licensee at the end of the inspection period. This URI will remain open pending the licensees completion of their assessment of the issue and the inspectors review of that assessment. This issue is also discussed in Section 71111.20 of this report.cussed in Section 71111.20 of this report.
23:59:59, 31 March 2012 +
23:59:59, 31 March 2012 +
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>.
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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>.
00:45:14, 21 February 2018 +
23:59:59, 31 March 2012 +