05000277/FIN-2018010-03
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | This violation of very low safety significance was identified by Exelon and has been entered into Exelons corrective action program and is being treated as an NCV, consistent with Section 2.3.2 of the Enforcement Policy. Violation: Peach Bottom Unit 2 and Unit 3 Renewed Facility Operating License Condition 2.C.(4) requires, in part, Exelon to implement and maintain in effect all provisions of the approved fire protection program as described in the Updated Final Safety Analysis Report. Fire Protection Program, Peach Bottom Atomic Power Station, Units 2 and 3, is incorporated by reference into the Updated Final Safety Analysis Report, as discussed in Section 10.12, Fire Protection Program. Fire Protection Program Chapter 5.1, Methodology, assumes that two or more circuit failures resulting in spurious operation of two or more valves in series at a high/low pressure interface may occur due to a postulated fire in any given area.Fire Protection Program Chapter 6.2, Analysis of High/Low Pressure Interfaces, requires Exelon to address the situations for which the isolation valves at a given interface point consists of two electrically controlled valves in series and where the potential may exist for a single fire to cause damage to cables associated with both valves.
8 Contrary to above, as ofMarch 14, 2018, Exelon identified they failed to evaluate two motor-operated valves in series, MO-2-06-2663 and MO-2-06-038B for Unit 2, and MO-3-06-3663 and MO-3-06-038B for Unit 3, where the potential may exist for a single fire to cause damage to cables associated with both valves. Specifically, a postulated fire scenario could cause spurious opening of the valves, which may potentially result in a fire-induced loss of coolant accident through the high/low pressure system interface. Exelons evaluation identified the affected valves cables are routed through Fire Area 6N for the Unit 2 valves, and Fire Area 13N for the Unit 3 valves, and thus, a possibility exists for a single fire to cause damage to cables associated with both valves. This violation is being treated as an NCV, consistent with Section 2.3.2 of the Enforcement Policy. Significance/Severity: The inspectors performed a Phase 2 Significance Determination Process screening for this issue, in accordance with IMC 0609, Appendix F, Fire Protection Significance Determination Process. This finding affected the post-fire safe shutdown category because of spurious operations of safe shutdown components. Based on a walkdown of Fire Areas 6N and 13N, the inspectors did not identify any credible fire ignition source scenarios that could affect both Unit 2 motor-operated valves or both Unit 3 motor operated valves. Therefore, based upon task number 2.3.5, the inspectors determined that this finding screened to very low safety significance (Green).Corrective Action References: IR 04115309, EC 623585, EC 623586 |
| Site: | Peach Bottom  |
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| Report | IR 05000277/2018010 Section 4OA7 |
| Date counted | Jun 30, 2018 (2018Q2) |
| Type: | NCV: Green |
| cornerstone | Emergency Prep |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Bickett E Dipaolo P Ott J Patel C Cahill G Dentel |
| Violation of: | License Condition - Fire Protection |
| INPO aspect | |
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Finding - Peach Bottom - IR 05000277/2018010 | ||||||||||||||||||||||||||||||||||||||||||
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Finding List (Peach Bottom) @ 2018Q2
Self-Identified List (Peach Bottom)
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