ML090500491
| ML090500491 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 02/18/2009 |
| From: | Yates G AmerenUE |
| To: | Thadani M Plant Licensing Branch IV |
| Thadani, M C, NRR/DORL/LP4, 415-1476 | |
| References | |
| TAC ME0210 | |
| Download: ML090500491 (2) | |
Text
From:
Yates, George G [GYates@ameren.com]
Sent:
Wednesday, February 18, 2009 10:51 AM To:
Mohan Thadani Cc:
Maglio, Scott A; Elwood, Thomas B
Subject:
TAC No. ME0210, one-time ESW B train 14-day outage Importance:
High Mohan:
As we discussed today, the wording of commitment 3 in Attachment 5 to ULNRC-05563 (dated December 1, 2008) should be clarified to avoid literal interpretation misunderstandings. That wording from ULNRC-05563, with emphasis added, is repeated below:
- 3. For the rest of the A ESW train and B ESW train LCO outages (the one-time 14-day Completion Times per ESW train minus the time limits noted above),
the out-of-service ESW train loads will be cooled by normal service water. Credit has been taken in the risk metric calculations for the ESF equipment serviced by the protected ESW train for the entire 14-day LCO outage on the opposite train (and for normal service water supplying the protected train loads if the protected ESW pump were to fail) and for the ESF equipment that can be serviced by normal service water associated with the out-of-service ESW train for the times note above. None of the PRA-modeled equipment in either train will be voluntarily taken out of service during the time that normal service water is available to supply the out-of-service ESW train loads. Non-intrusive TS surveillances and preventive maintenance equipment status verifications that do not affect equipment operability / functionality will be allowed. This commitment applies as long as the one-time 14-day Completion Time extension of TS 3.7.8 Condition A and TS 3.8.1 Condition B is in use; this commitment expires when these TS Conditions are exited.
During the time frame that commitment 3 covers, normal service water will be restored to the out-of-service B train and will be cooling the B train loads. The PRA analysis credits the B engineered safeguards feature (ESF) equipment that will be cooled by normal service water as highlighted in the commitment 3 text above. The portion of the B ESW system upstream of the point where normal service water connects with ESW will still be out-of-service, which is the reason for the 14-day amendment request. Obviously, that portion of the B ESW system that is isolated from the flow path for the piping connection process to the new HDPE piping (B ESW pump, self-cleaning strainer, various manual valves, check valves, instrumentation, etc.) is not credited in the PRA analysis supporting this amendment request.
Therefore, the highlighted sentence that reads:
None of the PRA-modeled equipment in either train will be voluntarily taken out of service during the time that normal service water is available to supply the out-of-service ESW train loads.
would have been clearer if it had been written as:
None of the PRA-credited equipment in either train will be voluntarily taken out of service during the time that normal service water is available to supply the out-of-service ESW train loads.
If you have any questions on this, please call Tom Elwood at (573) 676-6479 or myself at (314) 225-1702.
Note: Disregard the disclaimer that automatically appears at the end of this E-mail message. It is our understanding that the provided information may be placed in ADAMS (and thus on the docket), and this is acceptable to us.
Bert Yates AmerenUE Callaway Plant gyates@ameren.com P.O. Box 620 Junction Hwy CC and Hwy O Mail Code CA-460 Fulton, MO 65251
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Subject:
TAC No. ME0210, one-time ESW B train 14-day outage Sent Date: 2/18/2009 10:50:59 AM Received Date: 2/18/2009 10:50:59 AM From: Yates, George G Created By: GYates@ameren.com Recipients:
Mohan.Thadani@nrc.gov (Mohan Thadani)
Tracking Status: None SMaglio@ameren.com (Maglio, Scott A)
Tracking Status: None TElwood@ameren.com (Elwood, Thomas B)
Tracking Status: None Post Office:
exchgob5.corp.dir.ameren.com Files Size Date & Time MESSAGE 12817 2/18/2009 Options Expiration Date:
Priority: olImportanceHigh ReplyRequested: False Return Notification: False Sensitivity: olNormal Recipients received: