ML13330B533
| ML13330B533 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/16/1991 |
| From: | Nandy F SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9107250263 | |
| Download: ML13330B533 (3) | |
Text
Southern California Edison Company 23 PARKER STREET IRVINE, CALIFORNIA 92718 F. R. NANDY July 16, 1991 TELEPHONE MANAGER, NUCLEAR LICENSING (714) 454-4504 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Thermal Shield Replacement Support System Neutron and Acoustical Noise Acceptance Criteria San Onofre Nuclear Generating Station, Unit 1 This letter revises our schedule for submitting the thermal shield neutron and acoustical noise acceptance criteria. Due to unscheduled outages it is necessary to extend the submittal schedule to September 20, 1991. This letter also provides a consolidated schedule for the remaining thermal shield issues combining the remaining responses to Amendment No. 140 and the responses required as a result of a meeting with the NRC staff on October 3, 1990.
NRC Amendment No. 140, issued on December 19, 1990, provided NRC approval of the replacement thermal shield support system design, but also required resolution of several open issues. We submitted a schedule for responding to these issues in our February 20, 1991 letter. The enclosure to this letter provides an update and status of the items discussed in the February 20, 1991 letter as well as a schedule for submittal of the items required as a result of the October 3, 1990 meeting.
The submittal of the acceptance criteria for acoustic and neutron noise monitoring was scheduled for July 22, 1991, which is 120 days after return to service. This schedule allowed time for 60 days of monitoring during operation at 85% power or greater as required by license condition 3.M.
Due to an outage following the return to service, it will take longer than anticipated to achieve 60 days of operation at 85% power or greater. As a result, the schedule to submit the acceptance criteria will be extended to September 20, 1991. There are no other revisions to the schedule presented in our February 20, 1991 letter.
9107250263 910710 PDR
-ADOCK 05000206 P
Document Control Desk
-2 If you have any questions concerning this matter, please call me.
Very truly yours,
Enclosure:
cc:
George Kalman, NRC Senior Project Manager, San Onofre Unit 1 J. 0. Bradfute, NRC Project Manager, San Onofre Unit 1 J. B. Martin, Regional Administrator, NRC Region V C. W. Caldwell, NRC Senior Resident Inspector, San Onofre Units 1, 2&3 SCHEDULE FOR REMAINING THERMAL SHIELD SUBMITTALS Submittal Description Source Date
- 1.
Evaluation of the thermal shield support NRC Amendment 7/15/91 system analytical model considering the No. 140, dated as-found condition of the supports.
12/19/90, Item (a)
- 2.
Submit the totals for the radiation NRC issued 7/30/91 exposure received during the various Meeting Minutes parts of the thermal shield project.
dated 10/11/90
- 3.
Report on improvements to be made to our NRC Amendment 8/15/91 loose parts monitoring capability for No. 140, dated operation beyond Cycle 11.
12/19/90, Issue (g)
- 4.
Submit the final Westinghouse report for NRC issued 9/20/91 the thermal shield replacement support Meeting Minutes system design including any major design dated 10/11/90 changes made during the installation process.
- 5.
- Report documenting the postulated NRC Amendment 9/20/91 thermal shield support failures and the No. 140, dated corresponding frequency and amplitude 12/19/90, Issues changes.
(e) and (f)
- Submit the acceptance criteria for neutron and acoustical noise monitoring, based on 60 days of monitoring at 85% or greater power.
- 6.
Prepare Technical Specifications for NRC Amendment 12/20/91 monitoring the thermal shield during No. 140, dated plant operation.
12/19/90 Issue (c)