05000275/FIN-2014002-03
Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Technical Specification (TS) 3.6.3 requires that each manual containment isolation valv
is verified closed prior to entry into Mode 4, unless open under administrative controls TS 3.0.4.a specifies that entry into a Mode shall only be made when associated TS-required actions permit continued operation in that Mode for an unlimited period of time. TS 3.6.3, Required Action A.2, requires Diablo Canyon to verify that containment penetration 56 flow path is isolated prior to entering Mode 4 from Mode 5 for isolation devices inside containment. Contrary to this, on March 18, 2013, DCPP personnel failed to verify the flow path was isolated prior to a transition from Mode 5 to Mode 4, when a operator discovered that Unit 2 service air containment isolation valve AIR-S-2-200 wa open. The performance deficiency was more than minor because it was associated with the human performance attribute of the Barrier Systems Cornerstone, and it adversel affected the cornerstone objective to provide reasonable assurance that physical desig barriers protect the public from radionuclide releases caused by accidents or events, an is therefore a finding. This finding was determined to be of very low safety significanc (Green) because the service air system is not a structure, system, or component, onl the radiological barrier function of the containment was affected in Mode 4 and Mode 5 the event did not occur during an early time window, and did not occur within eight day of the start of the outage. The licensee entered the issue into the corrective actio program as Notification 50549533. |
| 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 | |
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Finding - Diablo Canyon - IR 05000275/2014002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2014Q1
Self-Identified List (Diablo Canyon)
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