ML19319A831
| ML19319A831 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/14/1975 |
| From: | Purple R Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 7912190860 | |
| Download: ML19319A831 (5) | |
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q OCT 1 4 WD Docket Nos. 5Q-2f1 50-270 and 50-287
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, Duke Power Company '
ATTN Mr. William 0. Parker, Jr.
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Steam Production J '.
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Tef.'the Oconee WeelearlStation ECCS ' analysis ~.0 " D. ;.
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> '. With reference to item 2) above, w:e, have concluded that there is not
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outlet mosslesLand the core support shield will be available to allow ~
" sufficient:boren dilution 6Accordingly, it will be necessary thatly
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' establish ~a'dilutieu.~ system l concept that;is not vu n
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, f >, in 'your April 16,.1975jletter..~1ho ~esclosure identifies (information we H,.
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Duke Power Capany I4E make this comelusion prior to issuing the license amendment that would i
Ameorporate rod withdrawal-limit surves for' operation of Unit 1 bey
': 250 BFPD.
12, 1975 #, MWe understand that timit 1 vill reach 250 EFPD
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Duke Power Company 2-OCT 14 W5 B..
this conclusion prior to issuing th inco
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rate rod withdrawat limit curves for opeWe 250 E D.
Decem
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ration of Unit 1 beyo 12, 1975 wnmat an as soo.
EFPD by about n as possible. you are urged to furnh uestwd-- -
-Sincerely,
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s, e-i REQUEST FOR ADDITIONAL 'INFORMATION CCONEE 1,- 2 AND 3 1.
With regard to the partial loop analysis; a.'. Provide a discussion of the consequences of a break in an active' cold leg of the_ fully active loop.-
- b. - An ~ analysis of 2-pump operatlon. is required to support this mode.of' operation. !/ithout this analysis, the Technical Specifications will prohibit 2-pump operation.
I Indicate and justify the worst-case pump status assumed.at c.
- the time' of the LOCA (tripped vs. powered).
d.
Provide assurance 'that the PCT-versus Break Size curve in i
'BAW-10103 would not be significantly altered by any r, ode of partial loop operation.
e.
Submit 1the LOCA parameters of interest identified in the
" Minimum Requirements for ECCS Break Spectrum Submittals"
. dated April 25,1975 (previously furnished to you by letter
~ dated June'13, 1975).
- 2..With regard to long-term cooling capability:
a.
Submit a large-scale-PGID 'of the decay heat removal system and.ECCS. - The drawing should cledrly show the flow paths for.
?
.thethreemodesofoperation.propdsedtolimitboronconcentrations
'during the.long-ters.
Lb. Provide the elevation of. the highest. point in the decay heat
- d' rop line relative to the hot' leg nozzle.
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The contention is made'that Modes 1,:-2
, and 3, in combination, are single failure proof and that a l' backup" el
^
ectri~ cal supply is present'to run the' pumps and actuate th e motor-driven valves
- for all: modes in case of. electrical failure List all pumps and valves included.in the three dilution mode s with their associated power supplies.
Specify their power requirements and relate to:the capacity of the " backup" powe
~
r supply.
Indicate the 16 cation of this power supply in the plan confirm its' safety classification as being appro and priate to an engineered safety' feature.
-d.
~ Provide a discussion of the specific manual actions
- 0 by the operator' for each mode of operatio required actions.are performed outside the control room 'nandd
'onfirm that remote readouts of dilution fl e.
ows for each mode are available in the control roGm.
f; Mode 3:
. Justify the 40 gpm predicted to occur ~ th I
rough the i
. auxiliary pressuria.er spray line. ' Since water is b from:the containment floor,. discuss the abili
. umped ty of the spray to i
-pass all materia 11 admitted through the sump ~ scree I
_ Discuss the capability to functionally test th'e dilu g.
ns.
o es.
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Provide a ~ discussion of measures you h'avo taken or plan to take to minimize the time required.to complete the necessary
. valve modifications.
Also, consider and provide a discussion of.-temporary measures (modifications and/or procedures)'that can be taken to provide added assurance of. long-term cooling
~ capability'during the period of time required to complete the
' permanent modifications.
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