ML19320A255
| ML19320A255 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 04/06/1972 |
| From: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Phillips J ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 8004210546 | |
| Download: ML19320A255 (4) | |
Text
e 4
~s
.-..ce..~
-e 9
_m (k[\\,f~C '5%', I n-y-
.., v 7 7 Q.1 ' "* ' ' 9
[
ISTRIBUTION:. VfS (,
.,.; [ I};
~[ hr '
,l DE W
.~Y i
'-F'}f
~
ugg
.ecket t
s
_; [,
_.[_,1
). 13ermerp. DEL
{
g.j' H
y
_ _ _. - - - " -ACRS (16)'
Dhkat' Ne'.~50-313 '_
PWR-4 Reading SHHanauer, DR FSchroeder, DRL TRWilson, DRL gpg 9
RSBoy<l, DRL RCDeYoung, DRL Mr. J. D. Phillips DJSkovholt, DRL Yice President sad Chief hagineer RLTedesco, DRL Arkansas Power & Light Company HRDenton, DRL Sixth and Pine Streets RWKlecker, DRL Piae Risif, Arkansae 71601 EGCase, DRS RRMaccary, DRS
Dear Mr. Phillips:
DFKnuth, DRS RBMinogue, DRS Ve have sampleted our initial review of Section 9 of t!EFFSElf,nq and Energemey Systems; the additional information described is the emelosure to this letter 1a needed before we sam complate our' review of this section.
Our review schedule is based en the assumpties that this additional infor-nation will be avai1=hle for sur review by April 28, 1972. If you * - t meet this data, pisase inform as withia 7 days after receipt of this letter so that me may revise our se' Pta=== eastect us'if you how any questions regardias the additional information required.
Sincerely.
- t. C. DeYoung, Assistaat Director for Pressurized Water ?.esetors Division of Reactor Licensing
Enclosure:
Additional Information Required es: See attached omcr >
DR(; WR-4
- DgI,
_,4 r DRT-:ADJPPs b dn
'8004' '. 1 0 f g d
RBe e km RCD g
sunnaeu w o m >.4/.f/.7.2 4((f72 4/[f7_2,
~
Forum ABC-Ste (Rev.9-53) ABCM 0240
- u s aovemanaev emw7we oreca. toto-a27 7se
- + f.. e
_e -
s e-
~
(
Mr. J. D. Phillips.
cc: Mr. Harlan T. Holmes Nuclear Project Manager Arkansas Power & Light Company Sixth & Pine Streets Pine Bluff, Arkansas 71601 Mr. Horace Jewell House, Holas, & Jewell 1550 Tower Building Little Rock, Arkansas 72201 Mr. Roy B. Snapp 1725 K Street, N. W.
Washington, D. C.
20006 s
D**]D 7 ]D
' 3
' Ml-o o m b m. fJ hl/L N13 0,,
%RL:P)dt R
7 N_
hi /6 R....e..
- n.. a_
DATE >
Feena ABC-Ste (Rev.9 53) ABCM 0240
- u. s.oovacasant emurwo orpes: 1,w?.7se L.
3 m
i
. ADDITIONAL INFORMATION REQUIRED ARKANSAS POWER & LIGHT COMPANY ARKANSAS NUCLEAR ONE - UNIT 1 DOCKET NO. 50-313
.t The requests for additional information listed herein relate to Section 9 of the FSAR, Auxiliary and Emergency Systems. These requests are numbered in sequence with those previously made by our letters of November 1 and December 13, 1971.
j 9.5 Design criteria for assuring the capability of the emergency cooling pond to perform its function during a safe shutdown earthquake (SSE) and during combinations of local floods and earthquakes were stated
}
in Section 9.7.2.3 of the Unit 2 PSAR. Provide sufficient information for an independent review of the functional capability of the pond during severe natural phenomena, reasonable combinations of less severe 1
natural phenomena, and site related events that may be caused by natural phenomena.
4 9.5.1 Provide a description of the emergency pond design and include plan and elevation views of all structures, including the spillway and the 1
intake and discharge structures. Provide a topographical map of the area south and west of the pond for a distance of at least 500 feet.
1 i
9.5.2 Provide the rainfall, rainfall distribution, unit hydrographs, runoff hydrograph, loss rates, drainage areas, pond routing hydregraphs and rating curves for the design flood selected in conformance with the criterion stated in Section 9.7.2.3 of the Unit 2 PSAT., i.e. the spill-way is designed to accommodate one half the local probably maximum
.i precipitation and remain stable under a concurrent OBE condition.
Identify the design margin in terms of the flow capacity of the spill-l way. Will the remainder of the pond remain functional for these i
conditions?
9.5.3 If earthfill is to be placed beneath the spillway or anywhere along the margin of the pond, provide the design bases and the construction J.
specifications for selection and placement. Either demonstrate the applicability of your earlier slope stability analysis to the spillway
- area or furnish a summary of additional slope stability analyses for
. this area.
<Ve
--,4
-pg.
,-,c 4
m 2-9.5.4 Section 9.3.2.4 of the Unit 1 FSAR states that weathered shale which extends to or above the pond bottom, will be excavated to a depth of two feet below the pond bottom and
. replaced with well compacted impervious clay material and that the pond sides will be handled in a similar manner as required. Describe the design bases and the construction specifications for this procedure, and provide the results of an analysis of the slope stability of these areas during a Safe Shutdown Earthquake (SSE). Also, demonstrate that assurance is provided that seepage will not exceed rates J
assumed in performance analyses.
i 9.5.5 In addition to earthquakes and floods identify other natural phenomena that have been considered in the design of the pond, e.g., wave action, and describe how the design' provides as-surance that loss of function will not be caused by these events.
9.5.6 Describe any design provisions to assure that phenomena as-I.
sociated with the pond will not cause a loss of function of the servics water system, e.g., inclusion of soil or foreign objects in the water delivered from the pond.
9.6 Provide the results of an analysis of the performance of_the service water system and ultimate heat sink, including heat rejection from the emergency cooling pond follouing loss of the capability of the Dardanelle Reservoir to provide service water. Provide sufficient information for an independent evaluation and include at least the following:
9.6.1 Id' ntify all operating modes that will be permitted by technical e
specifications for Unit 1 operation alone and for-concurrent operation of Unit 1 and Unit i, e.g., a loss-of-coolant ac-cident in either unit with concurrent shutdown of the other unit and the most rapid concurrent normal shutdown permitted for both units.
Include in the list of operating modes ali combinations of pump operation possible with and without affeite =c.ir.
t 9.6.2 State a11' assumptions and describe the calculational model including -(1) the model for calculating heat addition to the
],
. service water; (2) the initial water level in the pond; (3) the loss rate due to seepage from the pond, leakage from s
,, -