ML20094F788
| ML20094F788 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/06/1995 |
| From: | Rosenblaum R SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20094F791 | List: |
| References | |
| NUDOCS 9511090068 | |
| Download: ML20094F788 (3) | |
Text
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Southem Califomia Edison Company P.O.BOxE28 SAN CLEMENTE, CALWORNIA 92674 0128
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November 6, 1995 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C.
20555 Gentlemen:
Subject:
Docket Nos. 50-361 and 50-362 i
Amendment Application Nos. 152 and 136 Extension of the Allowed Outage Time for Safety Injection Tanks San Onofre Nuclear Generating Station Units 2 and 3
Reference:
CE0G CE NPSD-994 " Joint Applications Report for Safety Injection System Tank A0T/STI Extension," May 1995 Enclosed are Amendment Application Nos. 152 cnd 136 to Facility Operating Licenses NPF-10 and NPF-15 for the San Onofre Nuclear Generating Station Units 2 and 3, respectively.
These amendment applications consist of Proposed Change Number (PCN)-451.
PCN-451 proposes to modify post PCN-299 (Technical Specification Improvement Prog) ram) Technical Specification (TS) 3.5.1 to extend the Allowed Outage Time (A0T for a single inoperable Safety Injection Tank (SIT) from I hour to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Additionally, PCN-451 proposes to extend the SIT A0T from I hour to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> if a single SIT becomes inoperable due to malfunctioning water level indication or nitrogen cover pressure indication or both, i
This license amendment is a collaborative effort by participating Combustion I
Engineering Owners Group (CE0G) members based on a review of plant operations, deterministic and design basis considerations, and plant risk, as well as previous generic studies and conclusions from the NRC staff in NUREG-1366,
" Improvements to Technical Specifications Surveillance Requirements," and NUREG-1432, " Standard Technical S)ecifications Combustion Engineering Plants."
The above reference, which was su)mitted to the NRC staff for review and approval under separate cover, supports this change.
Edison requests this amendment be issued effective as of its date of issuance, and be implemented within 30 days from the date of issuance. This will provide adequate time for the necessary procedure changes and training on the new Technical Specifications.
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9511090068 951106 PDR ADDCK 05000361 l1 P
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Document Control Desk This license amendment is expected to save in excess of $100,000 over the remaining life of the San Onofre units from avoidance of a shutdown due to an overly restrictive TS A0T.
For example, Licensee Event Report No.88-022 reported that on August 21, 1988, a Unit 2 shutdown was initiated and an Unusual Event declared when the nitrogen cover pressure in one of the four SITS could not be restored and maintained within the one hour A0T. Since 1983, there have been four reported LCO 3.0.3 entries for Unit 2 and one entry l
reported for Unit 3 due to the inability to verify SIT water level and/or cover pressure. During this same period, Unit 3 had invoked LC0 3.5.1 Action "a' six times and in several instances approached the one hour A0T to return S'.T water level and/or cover pressure to the prescribed limits. As such, this i'
license amendment request is considered a Cost Beneficial Licensing Action (CBLA) due to the significant cost involved in shutting down the plant in addition to the potential for challenging the plant's safety systems.
If you would like additional infonnation on this Technical Specification change request, please let me know.
Sincerely, I
Enclosures cc:
L. J. Callan, Regional Administrator, NRC Region IV J. E. Dyer, Director, Divisier, of Reactor Projects, Region IV K. E. Perkins, Jr., Director, Walnut Creek Field Office, Region IV J. A. Sloan, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3 M. B. Fields, NRC Project Manager, San Onofre Units 2 and 3 H. Kocol, California Department of Health Services j
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ENCLOSURE (PCN-451)