ML17320A233

Responds to Question Re Basis for Full ECCS Flow Used in LOCA-ECCS Analysis in XN-NF-82-35,Suppl 1,per 821208 Telcon

ML17320A233
Person / Time
Site:	Cook
Issue date:	12/09/1982
From:	Jensen S SIEMENS POWER CORP. (FORMERLY SIEMENS NUCLEAR POWER
To:	Orr F Office of Nuclear Reactor Regulation
References
SEJ:034:82, SEJ:34:82, NUDOCS 8212140167
Download: ML17320A233 (6)

Text

REGULATE INFORMATION DISTRIBUTIO STEM (RIDS)

ACCESSION NBR;8212140167 DOC ~ DATE: 82/12/09 NOTARIZED! 'NO DOCKET FACIL;50-316 Donald C> Cook Nuclear Power Plantr Unit 2p Indiana 05000316 AUTH'AME AUTHOR Af FILIATION JENSENgS ~ Ey Exxon Nuclear Co.i Inc. (subs, of Exxon orp,)

RECIP NAME . RECIPIENT AFFILIATION ORRgF, Reactor Systems Branch

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SUBJECT:

Responds to question re basis for ful l ECCS flo used n LOCA ECCS analysis in XN"NF-82"35gSuppl leaper 8-1208 t leon.

DISTRIBUTION CODE: YG01S COPIES RECEIVED:LTR ENCL I Z EtSk.

TITLE: Generic Material with no Specific Distribution S NOTES:

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21g1 Hom Bapids Rood P. 0 Box 13g Eidiland, 8'ashington N352 Phone: (509) 375-8100 Telex: l 5-2878 December 9, 1982 SEJ:034:82 Nr. Frank Orr Reactor Systems Branch Division of Systems Integration Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 SUBJECT'NRC QUESTION REGARDING FULL ECCS FLOW

Dear Hr. Orr:

The following documents ENC's response to your question regarding full ECCS flow as discussed in our telephone conversation of December 8, 1982.

guestion In XN-NF-82-35, Supplement 1, ENC documented a LOCA-ECCS analysis assuming no single failure using full ECCS flow. What is the basis for the full ECCS flow used in this analysis?

~Res ense The full ECCS flow is a conservatively high ECCS flow rate vs system backpressure assuming all ECCS systems operate and accounting for all ECCS water sources. The data were generated by Westinghouse calculations specifically for D.C. Cook Unit 2 and were supplied to Exxon Nuclear Company by American Electric Power Company. The maximum safeguards flow or full ECCS flow is based on total pumped ECCS flow with all trains operating and all lines injecting. Specific assumptions include:

(1) The pump head curve was increased uniformly over the entire curve by lOX of the design head at design flow.

(2) The calculated system resistance was decreased by 20K.

(3) The SI and charging pump throttle valves were set to limit flow to 650 and 550 gpm, respectively, considering the reduced system resistance and design pump head curve.

(4) The RCP seal injection flow was included as a part of the total injection flow to the RCS.

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Nr. Frank Orr (USNRC) December 9, 1982 If you have any further questions, please feel free to call, telephone (509) 375-8477.

Sincerely, S. E. Jensen, Manager NSSS System Analysis (ECCS)

SEJ:gf CC: Nr. D. L. Wigginton (USNRC)

Dr. J. I. Castresana (AEP)

Nr. H. G. Shaw (ENC)

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