ML13331A396
| ML13331A396 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/20/1990 |
| From: | Wiesemann R SOUTHERN CALIFORNIA EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML13316A541 | List: |
| References | |
| NUDOCS 9004260215 | |
| Download: ML13331A396 (3) | |
Text
ATTACHMENT 2 PROPOSED LICENSE CONDITION 3.M 9004260215 900420 PDR ADOCK 05000206 P=
F'IC
M. Cycle 11 Thermal Shield Monitoring Program The neutron noise/loose-parts detection system shall be used to monitor the condition of the reactor vessel thermal shield throughout Cycle 11.
Periodic monitoring of both neutron noise and loose-parts vibrations confirms that no long term unacceptable trend of degradation is occurring. The details of this program are described below.
(1) Acceptance criteria for neutron noise/loose-parts monitoring will be established by performing baseline evaluations for 60 days at > 85%
power following return to service for Cycle 11 operation. The base line data will be established by recording a minimum of 16 segments of data information, each of 20 minute duration at > 85% power. Adjustments to the acceptance criteria will be made for cycle burnup and boron concentration changes throughout the cycle.
(2) The neutron noise/loose-parts monitoring system shall be OPERABLE in MODE 1 with:
a)
At least two horizontal loose-parts detectors monitored for at least five (5) minutes 2 times per day; and, b) at least three (3) neutron noise inputs monitored for at least twenty (20) minutes once a week, and be analyzed for cross power spectral density, including phase and coherence.
(3) The data provided by the loose-parts/neutron noise monitor shall be analyzed once per week and compared with the established criteria. If the data exceeds the acceptance criteria:
a) Within 1 day the NRC will be informed of the exceedance.
b)
Within 14 days the conditions will be evaluated and a report provided to the NRC documenting future plans and actions.
(4) Each channel of the loose-part detection system shall be demonstrated OPERABLE in MODE 1 by performance of a:
a) CHANNEL CHECK at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> b) CHANNEL TEST at least once per 31 days The surveillance requirements for neutron noise monitor are covered by the Appendix A Technical Specification 4.1.1 for the Power Range Neutron Flux.
(5) With the neutron noise/loose-parts detection instrumentation inoperable for more than 7 days, licensee shall submit a Special Report to the Commission pursuant to Appendix A Technical Specification 6.9.2 within the next 3 days outlining the cause of the malfunction and the plans for restoring the system to operable status.
(6) The provisions of Appendix A Technical Specification 3.0.4 are not applicable to this license condition.
SAN ONOFRE - UNIT 1
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