IR 05000428/2005002
| ML20212M259 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon, 05000000, 05000428 |
| Issue date: | 01/09/1976 |
| From: | Maccary R Office of Nuclear Reactor Regulation |
| To: | Deyoung R NRC |
| Shared Package | |
| ML20150F500 | List:
|
| References | |
| FOIA-86-391 NUDOCS 8608250426 | |
| Download: ML20212M259 (2) | |
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i Docket Nos.:
0-27)/323 l
MS: 27-11
R. C. DeYoung, Assistant Director
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for Light Fater Reacters, Group 1 l
Division of Reactor Licensing l
DIABIA CANYON SITE UNITS 1 & 2 DOCKET NOS. 50-275/323 l
l Plant Name: Diablo Canyon site, Units.1 and 2
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Docket Mos.: 50-275/323 l
Responsible RL Branch & Project Manager: LWR 1-3, D. Allison Responsible SS Branch & Technical Reviewer: MEB, P. Chen Requested Completica Date: N/A Description of Easponse: Supplement to Safety Evaluation Report l
Review Status: Incomplete i
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l Information regarding the potential eartignaka effects of the Hoagri
fault zone was submitted by the applicant in Amendment 37 to the FSAR-l and has been reviewed by the M=ehenie=1 Engineering Branch. The MEB
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has alae performed a selective seismic design adequacy audit of
mechanical and electrical ea-pan==es during the week from April 28th.
..to May 2nd., 1975. The ate =*had mapplement to the Safety Evaluatism.
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' Report' eestaims#thE M1== tom of the audit ~and review.
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1. R. Maccary, Assistant Director l
for *=-4-xing Divistem of Systems Safety ec w/ enc 1:
ac w/o encle D. Wi-l=at, MIR 1. Boyd, EL 1. Bei=====,
SS W. Mcdonald, MIPC 3. Varge, EL'
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l 0. Parr, RL D. Allison, EL Docket Files 50-275 & 323 J. Enight, 33 ER Reading File E. Brassmer, 33 SS:MER File P. Chen, SS o,,.,
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SUPPLEMENT TO THE SAFETY EVALUATION REPORT DIABLO CANYON UNITS 1 & 2 DOCKET NOS. 50-275 AND 50-323 3.9 Mechanical System and Components 3.9.3 Seismic Design Audit A selective seismic design adequacy audit of safety related mechanical components was conducted at the applicant's office.
The audit consisted of an evaluation of the maximum credible earthquake on the Hosgri fault zone (0.5g maximum ground acceleration for the safe shutdown conditions) and its effects on existing safety related mechanical components.
In addition, the applicant has submitted Amendment #37 to the Final Safety Analysis Report concerning the subject. The applicant has stated, and our audit has confirmed, that extra conservatism was built
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into the original input floor response spectra and the method of analysis for safety related mechanical components.
In addition,
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the applicant has complied with the ASME Code design limits in the design of these components. We therefore conclude that the
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seismic analyses and/or testing for the safety related mechanical components in the Diablo Canyon Units 1 & 2 haveprovided reasonable assurance that these components will function properly under the
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loads from vibratory forces imposed by the 0.5g maximum ground
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3.10 Seismic Qualification of Category 1 Instrumentation and Electrical Equipment A selective seismic design adequacy audit of safety related instrumentation and electrical equipment was conducted at the applicant's office.
The audit consisted of an evaluation of the maximum credible earthquake on the Hosgri fault zone (0.5g maximum ground acceleration for the safe shutdown conditions) and its effects on existing safety related instrumentation and electrical equipment.
In addition, the applicant has submitted Amendment
- 37 to the Final Safety Analysis Report concerning the subject.
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The applicant has stated, and our' audit has confirmed, that extra conservatism was built into the original input floor response spectra and the method of analysis for safety related instrumentation and electrical equipment.
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In addition,'the applicant has complied with the IEEE Standard 344, 1971 in the design of these components M
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We therefore conclude that the seismic analyses and/or testing
for the safety related instrumentation and electrical equipment in the Diablo Canyon Units 1 & 2 hare provided reasonable assurance i
that these components will function properly under the loads fro m
vibratory forces imposed by the 0.5g maximum ground acceleration i
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