ENS 42185
ENS Event | |
|---|---|
08:00 Nov 15, 2005 | |
| Title | Part 21 Notification - Safety Limit Minimum Critical Power Ratio Calculation |
| Event Description | (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 Safety Limit Minimum Critical Power Ratio (SLMCPR) for Susquehanna Unit 1 Cycle 14. (iii) Identification of the firm constructing the facility or supplying the basic component which fails 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 mean bow and standard deviation from recent channel measurements during a Susquehanna Unit 1 Cycle 14 (SQ1C14) mid-cycle outage exceed the values in the current database used in licensing analyses for Susquehanna Unit 1. The majority of data acquired at Susquehanna Unit 1 during the mid-cycle outage were in the exposure range of 35 to 45 MWd/kgU. In that range, the new measurements exceed both the mean and the standard deviation of bow from the existing database. Preliminary results from the measurements indicate that the mean from the new data is approximately 60% higher and the standard deviation is approximately 50% higher. The SLMCPR Technical Specification limit for Susquehanna Unit 1 Cycle 14 was too low (by about .01) when calculated with the channel bow values from the Framatome ANP channel bow database, since channel bows measured for Cycle 14 exceeded those in the channel bow database. Therefore a safety limit could have been violated. (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 15, 2005. (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 subject to the regulations in this part: Susquehanna Unit 1 Cycle 14. The other plants supported by Framatome ANP analyses, or using Framatome ANP supplied channels, are not impacted. (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: A new SLMCPR for the remainder of the Susquehanna Unit 1 Cycle 14 (denoted Cycle 14a) operation has been provided by Framatome ANP which bounds channel bow experienced during Susquehanna Unit 1 Cycle 14. Susquehanna Unit 1 also applied a conservative interim CPR penalty (.04) during Cycle 14 operation when slow settling of the control blades was encountered. (viii) Any advice related to the defect or failure to comply about the facility, activity, or basic component that has been, is being, or will be given to purchasers or licensees: In order to assure that other plants are not impacted in the future by unanticipated channel bow, recommended surveillance actions will be provided in January 2006 to all customers using Framatome ANP channels. |
| Where | |
|---|---|
| Framatome Anp Richland Richland, Washington (NRC Region 4) | |
| Organization: | Framatome Anp Richland |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+412.83 h17.201 days <br />2.457 weeks <br />0.565 months <br />) | |
| Opened: | Jerald Holm 12:50 Dec 2, 2005 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Dec 2, 2005 |
| 42185 - NRC Website | |
Framatome ANP Richland with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | |
WEEKMONTHYEARENS 421852005-11-15T08:00:00015 November 2005 08:00:00
[Table view]10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Part 21 Notification - Safety Limit Minimum Critical Power Ratio Calculation ENS 414552005-01-27T08:00:00027 January 2005 08:00:00 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Part 21 Report Concerning Mcpr Limits and Mcpr Monitoring 2005-11-15T08:00:00 | |