ML060960642
| ML060960642 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 11/04/2005 |
| From: | - No Known Affiliation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2006-0115 | |
| Download: ML060960642 (2) | |
Text
r AR. - Assignment Report Page I ot I Go Back Print I New Search I Home Assignment Report Assign #: 02 AR #: 00371248 Aff Fac:
Braidwood Assign Type:
ACIT Status:
COMPLETE Priority:
Assigned To:
VANOIX Due Date:
11/04/2005 Schedule Ref:
Prim Grp:
A8930TT Original Date:
10/07/2005 Unit Condition:
Sec Grp:
Assignment Request Subject/Description: document the...response to the questions and also that fee Assignment Completion In Progress Notes:
ATI 371248-02 John Kijowski, 10/07/05; ATI extended to 11/4/05 due to emergent activities (ie; SX strainer increased backwash resolution) and BOP Branch Manager off-site for two weeks at INPO. Extension approved by the BOP Branch Manager.
Justin Vano 11/4/2005; A follow-up was done with the active NRC resident inspector on 11/4/2005 to answer a question about the status of the Blowdown Vacuum Breaker Valves. The question asked by the inspector was as follows; Subsequent to 0CW058 leakage identified in May 2005, were the root cause actions reviewed for adequacy? If so, what was the conclusion?
The response given during the follow-up covered all applicable aspects of the CW blowdown vacuum breaker valves, starting off with the verification that the actions that came out of the root cause written on the CW blowdown valve failure in 2000 were still adequate. The actions that came from the root cause were also reviewed by engineering to verify all were completed and all the PM's created were completed and have since been performed as specified. The current status of the vacuum breaker valves was also discussed. Engineering has a high confidence level there will be no future failures of the system pressure boundary components causing a catastrophic failure. It was also specified that the confidence is not as high on the elastomer components of the valve based on the fact that some of the valves are cycled more frequently than others causing it to wear at a faster rate. It was also discussed that the vendor was contacted regarding the PM frequency and that their recommendation was to create a PM frequency based on previous system history because no formal vendor recommended PM frequency exists since elastomer performance is based on system operation (ie; system pressure, cycles, temperature). The NRC resident inspector was also informed about the current plan to help minimize the risk of elastomer component leaks. Discussed actions to adjust the PM frequency to replace the air release valves that see higher system pressures, increase the frequency of valve seat replacements, increase the blowdown vacuum breaker walkdown frequency as performed by Engineering and OPS (with strong consideration to once per month). A walkdown was completed by Engineering in Oct. 2005 and operations is scheduled to perform a walkdown in Nov. 2005. As for a walkdown in December and moving forward, Operations and Engineering will discuss resources for future inspections in support of increased frequency.
The NRC resident inspector was satisfied with the update and no further follow-up is required. This action can be closed with no further actions required.
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