ML20236C866
| ML20236C866 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon, 05000000 |
| Issue date: | 05/08/1975 |
| From: | Allison D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20236A877 | List:
|
| References | |
| FOIA-87-214 OL, NUDOCS 8707300222 | |
| Download: ML20236C866 (5) | |
Text
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MAY 081975 v/
Docket Hos.:
50415' and 50-323
)
i Applicant:
Pacific Gas and Electric Company (PG&E)
Facility:
. Diablo Canyon Nuclear Power Station, Units 1 & 2 (OL)
I SUtMARY OF MEETING HELD APRIL 4,1975 TO DISCUSS SEISMIC DESIGN OF-
)
DIABLO CANYON j
i On April 4,1975, representatives of PG&E and their contractors met' I
with the NRC staff in Bethesda, Maryland to discuss seismic design of J
Diablo Canyon, j
A list of attendees is enclosed.
l Significant points discussed are summarized below.
l The staff stated that it intended to perform a review in. depth of the
)
Diablo Canyon seismic design. This would include a visit of about one week to PG&E headquarters to review detailed information and meet with individuals responsible for various design aspects. This review would include:
i 1.
A review of how the criteria in the FSAF( were satisfied.
2.
A review of what structures and equipment are qualified and by what means.
3.
A review, in detail, of the design of certain selected
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structures and components.
Structures would include the
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containment building. Int' ke structure and turbine building.
j a
Components would include the steam generators, reactor
+ coolant pumps, and supports for both.
4.
A review of design control measures.
PG&E and Westinghouse made presentations on the following aspects of the~
l
- l seismic design
i 1.
Containment analysis. This was performed using a finite element method, including a portion of tne rock foundation.
It was also : performed using a lumped spring-mass model.
which agreed well with the finite element results.
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MAY 0 81975 -
t Pacific Gas and Electric Company,
2.
Auxiliary Building-Analysis. This was perfomed using a lumped mass / spring method.
Soil / structures. interactions were accounted for by modeling the soil as springs.
3.
Turbine Building Analysis. This structure was originally designed to the Unifom Building Code.
In order to demonstrate that the building (would not failin the event of a design basis _ earthquake 0.4g), a time history analysis 1
i was perfomed. Some modifications to the original design I
were made_as a result of this approach.
In December 1974, when typical structures were analyzed for certain 0.5g:
earthquakes, the turbine building was not included.
4.
Salt Water Cooling Pipe Design., These pipes, along 'with the circulating water conduits, are contained in a concrete sheath -
poured in competent rock. Dresser couplings provide flex-ibility at the connections to buildings. The staff expressed i
an interest in discussing the. flexibility provisions further at the next meeting.
I j
S.
Westinghouse Methods and Criteria. Westinghouse described the General Methods of perforting system and component i
analyses and the structural criteria' utilized. Generally, these components are designed for envelope loads which assume peak loads from a loss of coolant accident and a design basis earthquake occurring simultaneously. They are then checked to ensure that these' envelope loads assure qualification for each particular application.
If needed, a specific analysis for the particular appli-cation would then be perfomed.
6.
Reactor Coolant System piping and Supports Analysis.
Westinghouse described these analyses and the results.
Regarding the steam generator supports, Westinghouse
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j confirmed that they are designed for coincident LOCA reaction forces, jet impingement forces.and design basis earthquake forces. The staff expressed interest in l
discussing the capability of the steam generator supports j
for a 0.5g earthquake at the next meeting.
i 7.
Primary Equipment Component Analysis. Westinghouse j
described the analyses and results for the steam generators, pressurizer, reactor coolant pumps, control rod drive mechanisms, reactor pressurg vessel, reactor i
i vessel internals and fuel.
1
'l MAY 081975 1
Pacific Gas and j
Electric Company I il 8.
Auxiliary Equipment Seismic Analyses. Westinghouse described
)
the analyses and results for pumps, tanks, heat exchangers I
and valves.
1 1
9.
Instrumentation and Control Seismic Qualifications.
l Westinghouse described the qualification program. The staff expressed an interest in discussing the hot shutdown l
panel and the seismic qualification program for balance of plant equipment further at the next meeting; particular interest was expressed in items qualified by analysis.
It was agreed that a further review would be conducted April 28,1975, to May 2,1975.
Original Signed By f
Dennis P. Allison l
Dennis P. Allison, Project Manager i
Light Water Reactors Project Branch 1-3 I
Division of Reactor Licensing
Enclosure:
Attendance List cc w/ enclosures:
Pacific Gas and Electric Company Philip A. Crane, Jr., Esq.
Andrew J. Skaff Esq.
Mr. Frederick Eissler, President Ms Elizabeth E. Apfelberg l
Ms. Sandra A. Silver Mr. John Forster Mr. Lonnie Valentine i
Mr. William P. Cornwell I
Mr. W. J. Lindblad, Project Engineer I
i 8
LWR p... f..
R..1 O F FIC i
- EAn tsoni
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DAT= *
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/.[h... P b..O Form AEC-318 (Rev. 9 $3) AECM 0240 4
W u. B. GOVERNM ENT PRINTING OFFICEa 1974 826186
.MAY'0 8 197S ENCLOSURE N0. 1 LIST OF ATTENDEES PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON 1 &-2 MEETING APRIL 4, 1975 NRC Staff PG&E WESTINGHOUSE D. Allison F. Brady P.. ' Bl au G. Bagchi V. Ghio R. Balwanz i
J. Costello H. Ghormley '
J. Dorycott P. Chen W. Lindblad-
'G.
Downes R. C. DeYoung E. Wollak T. Esselman R. Hoffman S. Jarecki D.-Jeng JOHN BLUME & ASSOCIATES L. Knapp K. Kapur A. Kuenz J. Knight R. Gallagher S. Legge R. Maccary C. Lin R. Lipinski D. Miller L. Shao E. Rusnica R. Stuart P. Smith A. Villasor E. Vogoeling-L. Wohker i
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, DISTRIBUTION s/
Docket FilqpF R. Tedesco.
R. Maccary NRR Reading (M. Groff)
H. Denton R. DeYoung V. Benaroya
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V. Moore J. Collins D. Skovholt J. Kastner i
D. Muller G. Lainas j
R. Denise D. Ross i
K. Goller T. Ippolito G. Lear J. Knight W. Butler S. Pawlicki j
J. Stolz L. Shao 2
R. Clark B. Grimes T. Spies W. Gannill 1
D. Vassallo R. Ballard l
K. Kniel P. Fine
]
O. Parr T. Novak A. Schwencer M. Spangler j
D. Ziemann EP Project Manager -
W. J. Ross 1
P. Collins Attorney, ELD R. Purple IE (3)
G. Knighton V. Wilson G. Dicker ACRS' (14)
)
B. J. Youngblood Project Manager - D. Allison W. H. Regan, Jr.
LWR l-3 File R. Vollmer T. J. Hirons W. Houston G. Bagchi S. varga J. Costello R. Klecker P. Chen F. Schroeder R. Hoffman K. Kapur D. Jeng R. Lipinski R. Stuart 1
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