ML051880025
| ML051880025 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/01/2005 |
| From: | Katz B Southern California Edison Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML051880025 (2) | |
Text
SOUIHERN CALIrORNIA EDISON AnI E)ISON IN1IRNATIO\\NA I. Comnpany Brian Katz Vice President July 1, 2005 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
SUBJECT:
References:
San Onofre Nuclear Generating Station, Units 2 and 3 Docket Nos. 50-361 and 50-362 Additional Information Regarding Proposed Change Number (PCN) 561 Degraded Voltage Setpoints
- 1. Letter from Brian Katz (SCE) to Document Control Desk (NRC), dated May 27, 2005,
Subject:
"San Onofre Nuclear Generating Station, Units 2 and 3, Docket Nos. 50-361 and 50-362, Proposed Change Number (PCN) 561, Degraded Voltage Setpoints"
- 2. Letter from Brian Katz (SCE) to Document Control Desk (NRC), dated June 7, 2005,
Subject:
'San Onofre Nuclear Generating Station, Units 2 and 3, Docket Nos. 50-361 and 50-362, Additional Information Regarding Proposed Change Number (PCN) 561, Degraded Voltage Setpoints"
Dear Sir or Madam:
Reference 1 (PCN-561) requested changes to Technical Specification (TS) Surveillance Requirement (SR) 3.3.7.3.a to revise the allowable values for the degraded voltage relays. During a phone call with the Nuclear Regulatory Commission (NRC) on July 1, 2005, additional information was requested regarding PCN-561.
As stated in Reference 2, SCE has been making every effort to ensure that all actions necessary to implement the final proposed option (218 kV) are completed such that implementation would occur July 5, 2005. SCE also stated that if the final proposed option is not ready for implementation, the interim proposed option (219.5 kV) would be implemented.
At this time, SCE is prepared to implement the final proposed option (218 kV) without first implementing the interim proposed option (219.5 kV).
P.O. Box 128 San Clerncntc, CA 92674-0128 949-368-9275 Fax 949-368-9881 DCI
Document Control Desk July 1, 2005 Reference I stated that evaluation of the effect of the proposed change on voltages at the 120V level was ongoing, and would be completed by July 1, 2005. The evaluation determines what additional modifications similar to those described in Reference 1 would be necessary to ensure operation consistent with the calculations of voltages at the 4160 V level. This evaluation has been completed. The evaluation identified two additional tests of Control Power Transformers that should be completed prior to implementation of the final proposed option (218 kV). There is also a previously identified termination of a cable modification that must be completed prior to implementation. As committed to in Reference 1, all necessary testing and modifications will be completed prior to implementation of the proposed change.
If you have any questions or require additional information, please contact Jack Rainsberry at (949) 368-7420.
Sincerely, cc:
B. S. Mallett, Regional Administrator, NRC Region IV C. C. Osterholtz, NRC Senior Resident Inspector, San Onofre Units 2 & 3 B. M. Pham, NRC Project Manager, San Onofre Units 2 and 3