05000390/FIN-2015010-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | 420 Minute Operator Manual Action to Provide Source Range Monitoring Capability |
| Description | The inspectors identified an unresolved item associated with a fire protection safe shutdown OMA that established a time requirement of 420 minutes to provide a functional source range monitor. The inspection team noted that procedure 1-AOI-30.2 C36, Fire Safe Shutdown Room 737-A1A, Rev. 0005 included a 420 minute operator manual action (OMA) to establish a functional source range monitor. The OMA was listed as OMA 649 in Calculation EDQ00099920090016, Appendix R Unit 1 & 2 Manual Action, Rev. 4. The inspectors also noted the following: - Westinghouse Owners Group letter, WOG-05-36 (dated 01/28/2005), Section 6.2, Long Term Cold Shutdown Capability, stated that typical instrumentation to achieve a shutdown condition during Appendix R event included the source range monitors. - Technical Specification 3.3.1.L required an operable source range neutron flux channel in Modes 3, 4, and 5; and stipulated that positive reactivity additions (such as plant cooldown) be suspended when the instrument was inoperable. - Procedure 1-AOI-30.2, Fire Safe Shutdown, Rev. 0005, Step 5.3.15, stated that at least one channel of nuclear instrumentation indication must be available to monitor shutdown neutron population. - Procedure 1-AOI-30.2 C36 included a note that stated that RCS cooldown should not be initiated until source range monitoring capability can be assured. - Procedure 1-AOI-30.2 C36 directed operators to depressurize and cooldown an action that was typically required at 60 75 minutes. The 420 minute OMA would allow shutdown and subsequent cooldown of the reactor plant without operators having the ability to monitor neutron population. The licensee contended that OMA 649 was part of the sites licensing bases and thus the capability to monitor source range was not required until 420 minutes. The inspection team determined that this issue required additional inspection because the licensee did not provide an alternative method to monitor neuron population and did not provide adequate restrictions to prevent cooldown activities until monitoring capability was restored. Additionally, the OMA conflicted with the technical specification requirements for source range availability. The issue is unresolved pending additional review to determine if a performance deficiency exists. Required actions to resolve this issue include a detailed review of applicable docketed licensing bases correspondence; consultation with NRRs fire protection and technical specification branches; and an assessment to determine the applicable fire areas if the issue is to be determined to be a more-than-minor performance deficiency. This issue will be tracked as URI 05000290/2015010-01, 420 Minute Operator Manual Action to Provide Source Range Monitoring Capability. |
| Site: | Watts Bar  |
|---|---|
| Report | IR 05000390/2015010 Section 1R05 |
| Date counted | Sep 30, 2015 (2015Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | A Blamey A Lerch C Young D Dumbacher D Jones G Callaway J Eargle J Hamman J Jandovitz J Nadel L Micewski N. Pitoniak R Fanner S Sanchezd Jonesj Dymek O Lopez-Santiago R Fanner S Shaeffer W Monk |
| INPO aspect | |
| ' | |
Finding - Watts Bar - IR 05000390/2015010 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Watts Bar) @ 2015Q3
Self-Identified List (Watts Bar)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||