ML19326C242
| ML19326C242 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 03/03/1976 |
| From: | Phillips J ARKANSAS POWER & LIGHT CO. |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19326C243 | List: |
| References | |
| 2316, NUDOCS 8004220815 | |
| Download: ML19326C242 (3) | |
Text
- -
L%
NR.C,POHu 195 U.S. NUCLEAR P.EcULATOT;Y CO'4 MISSION DOCKET NUMIE R T
g 50-313 c'
NRC DISTRIBUTION ron PART 50 DOCKET MATERIAL TO:
FROM: Arkansas Power & Light Co.
ATE OF OOCUMENT Mr. D.L. Ziemann 3-3-76 Little Rock, Ark. 72203 J.D. Phillips DATE RECEIVED 3-8-76 ELETTEn ONOTORIZED PROP INPUT FORM NUMBER OF COPIES RECElVED CORiclNAL E UNC LASSIPIE D OcOPY 40 oficRIPTION Ltr re their 10-17-75 submittal...
Enclosure Revised Pages tcr the 10-7-75 submitta submitting a revision to include a limit 6 in re to Tech Spec.s?.....
~
related surveillance on the temperature of thepond....&trans the following:
(40 cys enc 1 rec.'d)
~
)
J.P
._ THIS DOCUMENT CONTAINp.
.c POOR QUAUTY PAGES PLANT NAME:
Arkansas Unit.1 SAkETY FOR ACTION /INFORMATION ENVIRO DHL 3-9-76
~
ASSIGNED AD :
ASSIGNED AD.
[ W BRANC:t CHIEP :
Es)
&,iMANA7 BRANCH CHIEF :
g PROJECT MANAGER:
ggalg g im PROJECT.
'A C Z R :
g LIC. ASST. :
DM41 LIC. ASST. :
INTERNAL DISTRIBUTION
[ REG FI h SYSTEMS SAFETY PI_A?rP RVRTEMR FWTun TPNt F
nw run _ m HETf!MtAN TFDERcn ERNST F I&E (1)
SCHRonnER BENAROYA BALLARD M
OELD LAINAS SPANGLER
^
- COSSICK & STAFF ENGINEERING IPPOLITO fiIPC
____MACCARy SITE TECH CASE KNIGHT OPERATING REACTORS GAMMILL IMIMUER SIINEIL STELLO STEPP HARLESS PAWLICKI HUDIAN OPERATING TECH PROJECT MANAGEMENT REACTOR SAFETY M
EISENHUT SITE ANALYSIS BOYD ROSS M
SHA0 VOLLMER P. COLLINS NOVAK W
BAER BUNCH HOUSTON ROSZTCCZY SCINENCtg
( J. COLLINS PETERSON CHECK W' GRIMES KREGER MELTZ HisLTEMES AT & I SITE SAFETY & ENVIRC-SKOVHOLT SA_LTZMAN ANALYSIS RUTBERG DENTON & MUT.LER PDb ^u3 8 '"V '"c ',. EXTERNAL DISTRIBUTION CONTROL NUMBER
- m NATL LAB BROOKHAVEN NATL LAB
^
. TIC REG. V-IE ULRIKSON(ORSL)
_ fdikC LAlPDR ASLn CONSULTANTS
.: 'f_AcaswzsEur re 4.a.
6oo4 220 @ g NicFOnM 195(2 76)
2egulatory Dccket EiL4 H EL PIN G BUILO ARKANSAS AR A
S AS POWER & LIGHT COMPA NY 97H & LOUISIAN A STAEETS. LITTLE ACCK, A AKANSAS 72203.(5011 371-4000 l
March 3,1976
\\ \\ "'s
[$pE/{l,;.89 s?
\\V DirectorIf Nuclear Reactor Regulation p3 %lQ
- 0., hs...
/pyO w (j F;r ATTN:
Mr. D. L. Ziemann, Chief Operating Reactor Branch #2 E
4,,g4 *%, p U. S. Nuclear Regulatory Commission
'//
Nashington, D. C.
20555 4
g Subj ect: Arkansas Power 6 Light Company Arkansas Nuclear One-Unit 1 Docket No. 50-313 License No. DPR-51 Technical Specification Change Request Emergency Cooling Pond Gentlemen:
On October 7,1975, we submitted a proposed change to Technical Specifi-
~
cations 3.11 and 4.13 related to the emergency cooling pond.
Based on discussions with the NRC staff on that request, we have revised the pro-posed change to include a limit and related surveillance on the tempera-ture of the pond. 'lhis change request supersedes that portion of the request submitted on October 7,1975, which relates to the emergency cooling pond.
In developing this change, it was found that the maximum initial pond temperature used in the FSAR was overly conservative. As a result, a re-analysis of the pond was perfomed to determine a more realistic pond temperature limit using a refined calculational technique.
The following plant information and data were used as input for the tempera-t"re study:
1.
Initial pond depths of 3, 4 and 5 feet; 2.
Service water flow of either one loop at 5250 gpm (nomal case) or two loops at 10,500 gpm (possible case);
3.
A pond surface area of 14 acres; noro 6 tJ.).O T A x P AvlN G. INV E S TC A OWN E O
)
MEMBER MlOOLE SOUTM UTILITIE S SYSTEM
Mr. D. L. Ziemi n March 3,1976 4.
Unit 1 Design Basis Accident (DBA) heat load (Unit 2 not yet in service); and 5.
Maximum allowable pond discharge tempe 4ture into the Service Water System of 120F.
The analysis conforms to Regulatory Guide 1.27, Rev.1, requirements and the methods are described in Section 9.2.5.3 of the ANO-2 FSAR (Docket No. 50-368).
The methods described in the ANO-2 FSAR were modified for the single unit analysis to accommodate the lower flow rate thr> ugh the pond from ANO-1 alone. The modification involved the assumption that the pond discharge is taken from both the surface and bottom layers of the pond.
In 'the ANO-2 FSAR analysis, only the surface layer was discharged.
This change eliminates the excessive conservatism fo ad in the original model for the low flow rates through the pond for one unit and realis-tically simulates the pond outlet structure which takes water from all depths of the pond.
The results of this study indicate that the limit on initial. pond temper-ature can be raised from the 94F now shown in the ANO-1 FSAR to 105F. The study also showed that this temperature limitation is not sensitive to water depth in the 3 to 5 foot range. Thus the 105F limit would apply with any pond depth in that range. The 105F limit includes an allowance for a margin of safety to account for limitations in predictive capabilities.
This change in the initial pond temperature does not affect the performance of the safety systems since the maximum pond discharge temperature remained at 120F as noted in item 5 above.
Your prompt review and approval of this chart is requested.
Very truly yours, i/
~
'J, D. Phillips Senior Vice President JDP:tw Attachment
,