05000275/FIN-2014002-05
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Technical Specification (TS) 3.7.12 requires two auxiliary building ventilation syste
trains be operable in Modes 1, 2, 3, and 4. TS 3.0.3 specifies, in part, that a failure t meet a limited condition for operation requires that actions shall be initiated within on hour to place the unit in Mode 5 within a specific time period. Contrary to this, between September 2009 and August 2012, DCPP personel allowed one or both auxiliary building ventilation system supply fans to be inoperable during various periods, resulting in violations of TS 3.7.12 and TS 3.0.3. This performance deficiency was more than minor because it was associated with the mitigating systems cornerstone attribute of design control and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events. A detailed risk evaluation was required to determine the significance of the finding. The risk analyst reviewed the licensees assumption that adequate cooling would be provided to the emergency core cooling systems by operation of both supply fans from either of the two units. Because the auxiliary building ventilation function was always available; the risk significance of the auxiliary building ventilation system was low; and the periods of time that the system was not operable were relatively short, the risk analyst concluded that the subject finding was of very low safety significance (Green). The licensee entered the issue into the corrective action program as Notification 50507930. |
| Site: | Diablo Canyon  |
|---|---|
| Report | IR 05000275/2014002 Section 4OA7 |
| Date counted | Mar 31, 2014 (2014Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | B Parks C Smith J Reynoso P Jayroe P Kaufman T Hipschman W Walker |
| Violation of: | Technical Specification |
| INPO aspect | |
| ' | |
Finding - Diablo Canyon - IR 05000275/2014002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Diablo Canyon) @ 2014Q1
Self-Identified List (Diablo Canyon)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||