ML050190256
| ML050190256 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry, LaSalle  |
| Issue date: | 01/14/2005 |
| From: | Holm J Framatome ANP |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| 41335 | |
| Download: ML050190256 (4) | |
Text
1 0111412005 U.S. Nuclear Regulator Commission Operations Center Event Report Pace I General Information or Other (PAR)
Event #
41335 Rep Org: FRAMATOME ANP Notification Date I Time: 01/14/2005 14:10 (EST)
Supplier! FRAMATOME ANP Event Date I Time: 01/14/2005 (PST)
Last Modification: 01/14/2005 Region: 4 Docket #:
City: RICHLAND Agreement State: Yes County:
License #:
State: WA NRC Notified by: JERALD HOLM Notifications: RUSSELL BYWATER R4 HQ Ops Officer: BILL GOTT Emergency Class: NON EMERGENCY 10 CFR Section:
21.21 UNSPECIFIED PARAGRAPH PART21 REPORT The following information was provided by Framatome ANP "The turbine generator load rejection with failure of the turbine bypass valves to open event (LRNB) is a potentially limiting anticipated operational occurrence (AOO) considered in establishing the MCPR operating limit and confirming that the linear heat generation rate (LHGR) limits are adequate. Framatome ANP analyses for the LRNB event assume that the load rejection will initiate a fast closure of the turbine control valves (TCV) at all power levels. Some plants have indicated that the fast closure of the TCV is not initiated below a plant specific power level. The fast closure of the TCV initiates a scram and minimizes turbine over speed. If a fast closure of the TCV does not occur, the TCV will close at a slower rate, scram will be delayed, and the turbine will overspend. This may increase the severity of the event. The turbine overspend may result in an increase in recirculation pump speed that will also increase the severity of the event."
The affected plants LaSalle Unit 2 Cycle 10 and Browns Ferry Unit 3 Cycle 12 have been notified. A set of revised operating limits, which are appropriate for the conditions when a fast closure of the TCV does not occur, have been provided to the affected plants.
J C, -ZCl
Jan 14 05 11:l0a A
AR EVA RIREVR FRIFMRTME RNoP 5093758965
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Framatome ANP, Inc. AnAREVAandSiemens Company FAX To: NRC Operations Center Company:
U. S. Nuclear Regulatory Commission Receiving fax: 301-816-5151 Telephone: 301-816-5100 Extra Distribution to:
Date: 1/14/2005 Time in: 11:01 AM Pages to follow: 2 i
From: Jerald S. Holm uo w
Telephone: 509-375-8146 MB: 18 El Original to be mailed
[
Via fax only Sending fax: 509-375-8965 Fax verification: 509-375-8308 Message:
Please see attached notice of defect.
This facsimile transmission is intended only the Individual(s) named above. It may contain Information which is legally privileged.
confidential, or otherwise protected from disclosure by law. Any use of this transmission by Individuals other than those named above is strictly prohibited. If you receive this transmission in error, please call the fax verification number above immediately, and mail the original transmission to us at the address set forth below. Thank you.
Framatome ANP, Inc.
2101 Horn Rapids Road Richland, WA 99354-5102 Telephone: (509) 375-8100 Operator:
Log No.:
Time Sent:
01/14/2005 FRI 14:09
[TX/RX NO 8854] iU01
Jan 14 05 11:11la RREVR FRF1MATME FINP 5093758965 P. 3 regulations in this part.
The plants for which Framatome ANP performs analyses ard which are impacted by this defect are LaSalle Unit 2 Cycle 10 and Browns Ferry Unit 3 Cycle 12. The operators of the other plants for which Framatome ANP performs analyses have indicated that they are not impacted by this defect.
(vii)
The corrective action which has been, is being, or will be taken; the name of the individual or organization responsible for this action; and the length of time that has been or will be taken to complete the action.
The affected plants have all been notified. A set of revised operating limits, which are appropriate for the conditions when a fast closure of the TCV does not occur, have been provided to the affected plants.
The plants are currently monitoring to these limits. Framatome ANP future analyses for these plants will correctly model the TCV closure characteristics.
.1*
(viii)
Any advice related to the defect or failure to comply about the facility, activity, or basic component that has been, is being, or willibe given to purchasers or licensees.
See (vii) above.
- .i 01/14/2005 FRI 14
- 09
[TX/RX NO 8854] lD003
Jan 14 05 11:l0a AREVA FRRMRTME RNP bU/375ib; Reportable Defect (i)
Name and address of the individual informing the Commission Jerald S. Holm, Framatome ANP, 2101 Horn Rapids Road, Richland, WA 99354 (ii)
Identification of the facility, the activity, or the basic component supplied for such facility or such activity within the United States which fails to comply or contains a defect.
The minimum critical power ratio (MCPR) operating limit and linear heat generation rate (LHGR) operating limit.
(iii)
Identification of the firm constructing the facility or supplying the basic component which falls to comply or contains a defect.
Framatome ANP (iv)
Nature of the defect or failure to comply and the safety hazard which is created or could be created by such a defect or failure to comply.
The turbine generator load rejection with failure of the turbine bypass valves to open event (LRNB) is a potentially limiting anticipated operational occurrence (AOO) considered in establishing the MCPR operating limit and confirming that the linear heat generation rate (LHGR) limits are adequate. Framatome ANP analyses for the LRNB event assume that the load rejection will initiate a fast closure of the turbine control valves (TCV) at all power levels. Some plants have indicated that the fast closure of the TCV is not initiated below a plant specific power level. The fast closure of the TCV initiates a scram and minimizes turbine overspeed. If a fast closure of the TCV does not occur, the TCV will close at a slower rate, scram will be delayed, and the turbine will overspeed. This may increase the severity of the event.
The turbine overspeed may result in an increase in recirculation pump speed that will also increase the severity of the event.
(v)
The date on which the information of such a defect or failure to comply was obtained.
This issue was determined to be a deviation on November 18, 2004.
(vi)
In the case of a basic component which fails to comply, the-number and the location of all such components in use at, supplied for, or being supplied for one or more facilities or activities subjectto the P.. r 01/14/2005 FRI 14:09
[TX/RI NO 8854]
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