ML20039H242
| ML20039H242 | |
| Person / Time | |
|---|---|
| Site: | 05000561 |
| Issue date: | 12/20/1976 |
| From: | Knight J Office of Nuclear Reactor Regulation |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML111090060 | List:
|
| References | |
| FOIA-80-515, FOIA-80-555 NUDOCS 8201190760 | |
| Download: ML20039H242 (4) | |
Text
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"NITED STATES y*
NUCLEAR t ' 7ULATORY cOMMisslON i
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j' WA D i 'i. ION, D. C. 20555 A_
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Docket No. STN 50-561 DEC 90'.376 MEM0PANDUM FOR:
D. Vassallo, Assistant Director for Light Water Reactors, Division.of Project Management s
l-FROM:
J. Knight, ' Assistant Director for Engineering, j
Division of Systems Safety i
j
SUBJECT:
BABC0CK & WILC0X STANDARD SAFETY ANALYSIS REPORT BSAR-205, SAFETY EVALUATION REPORT - SSAR REVIEW.
(SEB:1221) i h
Plant Name:
N/A Licensing Stage:
SSAR-SER Docket No.:
STN 50-561 i
Responsible Branch and Project Manager:
LWR-3. T. Cox Requested Completion Date:
December 6, 1976 Applicant's Response Date Necessary for Completion of Next Action Planned on Project:
Unknown j
Description of Response:
N/A i
Review Status:
Complete licant has been reviewed and evaluated The SSAR submitted by the apktructural Engineering Branch.
by S. P. Chan of Section A, Our sections of the safety evaluation report are enclosed. This evaluation is based on information provided by the applicant in the application j
through Amendment No. 6, dated November 15,.1976.
I
. P. Knight, Assistant Director
'for Engineering l
Jivision of Systems Safety l
Enclosure:
Structural Evaluation for B & W. BSAR-205 '
cc w/o encl:
cc w/ encl:
R. Boyd R. Heineman T. Cox W. Mcdonald S. Varga D. Jeng I
- 1. Sihweil S. Chan
. 0/Parr 8201190760 810403 PDR FOIA MADDEN 80-515 PDR
i 4 -..
a BABC0CK & WILCOX COMPANY STANDARD SAFETY ANALYSIS REPORT _
BSAR-205 l'
DOCKET N0. STN 50-561 STRUCTURAL ENGINEERING BRANCH SAFETY EVALUATION REPORT 3.3 WIND AND TORNADO LOADINGS I.
l BSAR-205 does not contain data _on wind and tornado loadings, l
design criteria, and design procedure for these loadings. They will be provided in the BOP applicant's Safety Analysis Report.
All systems and components within.the scope of BSAR-205 should be protected from the effect of these loadings.
3.4 WATER LEVEL (FLOOD) DESIGN j
All B & W scope-of-supply safety-related systems and components will j
be located above the probable maximum flood level or placed in struc-tures that cannot be flooded.
Information on water level (flood) design will be provided in the B0P applicant's Safety Analysis Report.
f 3.5 MISSILE PROTECTION CRITERIA j
All B & W scope-of-supply safety-related systems and components l
will be protected against potential missiles.
BSAR-205 has provided interface criteria for missile protection, but does not include the design analysis and criteria used for structures or barriers that pro-tect essential systems and components from missiles generated inside or outside the containment structure.
The B0P applicant must, there-fore, consider the effects of postulated missiles (both externally and internally generated missiles), and provide the necessary infor-mation in the Safety Analysis Report.
3.7 SEISMIC DESIGN The seismic design response spectra (0BE and SSE) and the damping values applied in the design of Seismic Category I structures, systems and components comply with the requirements'of Regulatory Guides 1.60, " Design Response Spectra for Nuclear Power Plants,"
and 1.61, " Damping Values for Seismic Design of Nuclear Power Plants", respectively.
The nominal values of maximum ground f
acceleration are 0.3g for SSE and 0.159 for OBE.
B&W uses l
'different break points in response spectra and a soil interaction amplification factor of 2 for basemat accelerations, resulting in a set of response spectra more conservative than those of Regula-tory Guide 1.60 The synthetic time, history to be used for Seismic Category I plant component design is adjusted in amplitude and frequency to envelop the BSAR-205 response spectra.
Conformance with the recommendation of Regulatory Guides 1.60 and 1.61 provides reasonable assurance that earthquake accelerations imposed on Seismic Category I structures, systems and components are adequately defined to assure a conservative basis for the design of such structures, systems and components to withstand the consequent seismic loadings.
Compliance with these guides constitutes an acceptable basis for satisfying the provisions of Criterion No. 2 of the NRC General Design Criteria.
Modal response spectrum and time history methods for multi-degree-of-freedom systems will form the bases for analyses of all major Seismic Category I systems and components.
Governing response parameters will be combined by the square root of the sum of squares to obtain maxima when the modal response spectrum method is used.
Corrective terms involving double summation of products j
of responses will be used for modes with closely spaced frequencies.
s f
Tlirce components of seismic motion are considered:
two horizontal and one vertical. The total response is obtained by the square root of the sum of squares of the three components for the modal I
i response spectrum method.
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B & W has committed to provide all necessary NSS-80P interface in-formation including envelope spectra for the RCS supports. These support spectra inputs to be used for design and test verification of B&W systems and components will be checked with the support re-sponse spectra provided in the applicant's Safety Analysis Report to ensure interface compatibility between BSAR-205 and the balance.
of plant.
System and subsystem analyses will be performed on an elastic basis.
We conclude that the dynamic methods and procedures for seismic systems proposed by Babcock and Wilcox provide an acceptable basis for seismic design.
BSAR-205 does not include a seismic instrumentation program.
Therefore, a description of the seismic instrumentation pro-gram should be provided in the B0P applicant's Safety Analysis
]
Report.
The issue on advisability of adoption of a seismic scram system remains unresolved.
The subject will be addressed in the B0P applicant's PSAR and in the staff's evaluation thereof.
3.8 DESIGN OF CATEGORY I STRUCTURES BSAR-205 provides the interface criteria in Section 3.7.6 and the B0P applicant has the responsibility for the design of the con-tainment structure, internal structures, and other Category I structures. Therefore, the B0P applicant should provide the infor-mation on the design of Category I structures in the B0P Safety Analysis Report.
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