ML20199C414
| ML20199C414 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/14/1997 |
| From: | Nunn D SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20199C419 | List: |
| References | |
| RTR-NUREG-0800, RTR-NUREG-800 NUDOCS 9711200008 | |
| Download: ML20199C414 (2) | |
Text
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7 m"h sotnHERN CAlllORNIA
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. An wav mm.anout canc.ar November 14, 1997-U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington D.C.
20555 Gentlemen:
Subject:
Docket Nos. 50-361 and 50-362 Supplement 1 to Amendment Application Nos.138 and 122 Use of NUREG-0800 St.ndard Review Plan Guidance in Evaluating Tornado-Generated Missiles San Onofre Nuclear Generating Station Units 2 and 3
References:
- 1. NUREC-0800 Standard Review Plan, (Revisions 0, 1, and 2)
Section 3.5.1.4, Missiles-Generated by Natural Phenomena
- 2. Letter dated November 24, 1980, from Mr. K. P. Baskin (SCE) to Mr. F. Miraglia (NRC)
- 3. Licensee Event Report 2-93-006, Licensing Basis for Units 2 and 3 Auxiliary feedwater Piping Tornado Missile Barriers Not f
Fully Met - Voluntary Report
- 4. Letter ' dated February 1,1994, from Mr. R.M. Rosenblum (SCE) to Document Control Desk (NRC).
Subject:
Amendment Application Nos. 138-and 122, Use of NUREG-0800 Standard Review Plan Guidance in Evaluating Tornado-Generated Missile Barriers l
Enclosed is Supplement I to Amendment Application Nos.138 and 122 to Facility Operating Licenses NPF-10 and NPF-15, for the San Onofre Nuclear Generating Station '(SONGS), Units 2 and 3, respectively. The Amendment Applications consist of Proposed Change Number :433 (PCN-433), which is a request _ to revise the licensing basis as-described in the Updated Final Safety Analysis Report (UFSAR) Section 3.5, " Missile Protection."
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-This proposed change to the licensing basis of SONGS 2&3, which is a complete replacement for the original PCN 433 (Reference 4), will allow the use of NUREG-0800, " Standard Review Plan" (SRP) methodology in evaluating 1
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In particular, a probability based criteria is used to evaluate missile barrier requirements consistent with SRP Section 3.5.1.4.
This change _to the licensing basis of the plant is a corrective action resulting from 1.icensee Event Report 2-93-006.
Supplement I to this FCN is being submitted to add new cases to the previously submitted analysis. These cases were identified following the original submittal of PCN 433 (Reference 4). Also, because NRC guidance on using.
Probabilistic Risk Analysis (PRA) to support licensing issues is currently under development, Supplement. to PCN 433 no longer uses probability of core damage as a basis for this change.
Supplement I uses a basis of probability of damage to critical components due to tornado-generated missiles to meet the acceptance criteria as stated in the SRP.
If you need additional information on this UFSAR change request, please let me know.
Sincerely, 1
0 A
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Enclosures l
cc:
E. W. Merschoff, Regional Administrator, NRC Region IV K. E. Perkins, Jr., Director, Walnut Creek Field Office, NRC Region IV J. A. Sloan, NRC Senior Resident Inspector, San Onofre Units 2 & 3 M. B. Fields NRC Project Manager, San Onofre Units 2 and 3 l~
S. Y. Hsu, Department of Health Services, Radiologic Health Branch l
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