ML20148H086

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Submits Info Re Plant Operation W/Three Loops Per 720823 Telcon
ML20148H086
Person / Time
Site: Yankee Rowe
Issue date: 08/25/1972
From: Vandenburgh D
YANKEE ATOMIC ELECTRIC CO.
To:
US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8011170142
Download: ML20148H086 (5)
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Text

{{#Wiki_filter:. e e i i YANKEE ATOMIC ELECTRIC COMPANY ,YAN-. l 20 TURNPIKE ROAD, WESTBORO, MASSAC AUSETTS 01581 TELEPHONE 617 366 9011 l i August 25, 1972 Rfgulatory Filo Cy. 01 f@ United States Atomic Energy Commission g Washington, D. C. 20545 t s &gQ.g.1.h l ? Attention: Directorate of Licensing Y y Q '< f 9

Reference:

License No. DPR-3 (Docket No. 50-29) c' s, b

Dear Sirs:

,g O lf l With reference to a telephone conversation on August 23,1972 between your Mr. Burger and our Mr. Andognini, Yankee Atomic Electric Company offers l the following information relative to the operation of the plant with three l loops. During the Yankee - A.E.C. discussion of Proposed Cha'nge No. 96, Yankee l indicated that a study had been initiated for plant operation with three reactor coolant loops operating and that preliminary'.teviews indicated that this mode of operation was not limiting. However, Yankee did agree not to operate in the three loop mode.until the study had been. completed. On July 14, 1972, the study was completed confirming that the pre-liminary reviews for this mode of operation were correct and that no special surveillance such as ECCS line-up was required when operating in this mode. As a result of the analysis and the operational need to isolate a ) l reactor coolant loop, Yankee operated the plant on three reactor coolant i loops. l t i 3 l We trust that this information is satisfactory; however, should you j desire additional information feel free to contact us. t Very truly yours, t 9-k YANKEE ATOMIC ELECTRIC COMPANY f C y A ~MLE h. (, l 1j pjjGE.1752*'h Donald E. Vandenburgh l 1 b.) Y& Vice President q () !..i 1 GCA/amw b V U'U ' l Attachment // .y 7y73 g0CU dpG2J 3 CCHTA%n w cc: J. O'Reilly P00R Q"/.'JTy et. iha j 8 011170 /Q p ~%- .W

,,E w s-u h MEMORANDUM h To L. IJoider July 1h, 1972 COMP AMV OR LDC41 TOM FnoM A. Ladieu FILC _ I 3*3*b SucaccT 3 p Loss of Coolant Accident Analysis for Yankee Nuclear Pouer Station _ -- _ _. = = - - - -

==-=- -= P1FERENCES

  1. 'I WI - 10 05 1.

" Criteria for Emergency Coro Cooling Systema for Light Water Power Reactors", AEC Int rim Policy Statement published in the Federal Register, Vol. 36, June 29, 1971. 2. " Yankee Nuclear Power Station Revised Loss of Coolant Analysis", Submitted to the AEC on January 15,1972. DISCUSSION This memo is in reopenso to a request by E111 Jones for results of the analysis of the Yankee Safety Injection System performanco during 3-Loop plant operation. The analysis has been done by Westinghouse and is based 3 on the analytical methods and aos nptions listed in Appendix A, Part 3 of the AEC Interim Policy Statement. .) A complete lict of accur.ptions is / given in Reference 2. COMENTS The above annlynis has oeen completect and resulte nre informnlly available. i Telephoto copico of celected pages of the final report are attached. SAFETY EVALUATIOU It is concluded from the results of the analysis that the Yankee Nuclear Pouer Station during 3-Loop operation at 75% power complica with the cri',cria enur. crated in Section ll.A of the AEC Interim Policy Statement. cc: UGJ (Rowe) ERW WDH RJC i, lnbYAD A. E. Ladieu - Originator Nuclear Engineering Section [f, v W. D. Hinkle - noviewer Section Head 1 k

p ... V.: Page 3 //,

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1. 1 t Ngurcs 1 through 6-present the transients for signiffcant para-meters of the analyses. The following items should be notod: figures :1-15 Tne system pressure curve shown is the calculated pressure in the lover core region..%e quality curve presents the p values for the hot spot; this is the. larger of the two j values calculated in the core region.' The core flow shown is the actual value for the core midplane. The avera00 mss velocity can be obtained by dividing the flow rate 2 shown by 14.2 ft. The hot spat msst velocity is taken I to be 60 percent of the average mass velocity. The heat ' transfer coefficient sham is for the hot spot. i Figums.17-20 These figures show the hot spot clad temperatura transients. J. t Figures 21-25 These figures show the core reflood transients for the j 2 worst casa, the.5 Ft cold leg split in cn active loop, i The high0 t clad teperature occurred for the.5 Ft" cold 109 split in an activo loop and was 1969 F. This was also the worst brahk ex-perienecd in the four loop LotA analyses. Bessons for this result are presentes in the four loop LOCA analysis. Ccmparison of the four breaks of the loop out of service LOCA indicates the fo110 ting: 1) The break area for the isolated loop break is limited to the crea of the pipe since tha break can be fed from one direction only. 2) During bloudown more flow passes through the core for the isolated l loop break since all flow entoring the upper plenum frrA the intact t loops is directed through the core. 3) For an isolcted loop break, all three injection lincs deliver to RCS { l-pressure. Thus no accumulator u3ter is spilled directiy to the breat, l 4) During reficod the resistance to steam flow being vented to the break j is slightly greater for the isolated loop break because stcam must be t v w .....v ..w. e - v 1 i

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AEC DIGIBUTION FOR PART 50 DOCXET f/KR*IAL ~ (TEMPORARY FORM) CONTROL NO: 4802 FII2 FROM: Yankee Atomic Electric Co. DATE OF DOC: DATE REC'D LTR IGMO RPr CrfER ~ Westboro, Mass.. 01581 Donald E. Vandenburgh 8-25-72 8-31-72 K TO: ORIG CC OfHER SShT AEC FDR / DRL 1 signed 39 SStif LOCAL PDR , h 3 ROP INFO CLASS: INPUT NO CYS REC'D DOCKET NO: 40 50-29 ) DESCRIF2 ION: Ltr re tele / con on 8-23-72.... ENCLOSUE'S: Memorandum ot.o /- a-/4 m is. Laam -furnishing addl info to Proposed Change No. to L. Heider re 3-loop loss of coolant acc6 96 & trans: dent analysis for Yankee Nuclear Power Sta. I (40 con'fcysenc1 rec'd) dl bd$ I cmnmt tna FIANT iia!GS: YAEC W d x 0r!.S0L FOR ACTIO;i/IN/ORMATION DL b.il-7 2 /, ', BUTLER (L ) CIIEL(L) VASSALLO(L) ZIEMANH(L) Kii1GET0li(ENVIRO j W/ Copies W/ Copies W/ Copics W/ Copic.c W/ Copies CLARK (L) SCINENCER(L) H. DENTON CHITWOOD(FM)' YOUNGBID0D(EINII W/ Copies W/ Copies W/ Copics W/ Copies W/ Copies l GOLIIR(L) STOLZ(L) /SClyMEL(L) DICKER (ENVIRO) i W/ Copics W/ Copics W/DCopica W/ Copics W/ Copies j I.DRNAL DISP GBUTION hEG J,5If TECH IUNIEW VOLIER HARLESS W5DE(E) C PDR hrMMIE DElff0N SHAFER(F&M) i GC, RCOM P-506A SCHROEDER GRIMES F&M RROWN(E) E~TZII:G/ STAFF MACCARY G/JGIILL 6;MLEY G. 'WILLING(E) CASE IA!!GE KASTI!ER HUSSBAUMER A/T II3 GI/JGUSSO PAWLICKI BALLARD BwsITM/di BOYD-L(BER) SHA0 FINE LIC ASST. SALTZE/di DUYOU::G-L(P'G) K:,VrH SERVICE L) dKOVEOLT-L STELID EINIRO MASON L) PLA1:S P. COLLII;S N00RE MULLER WILSON L} MCD3NALD THOMPSON DICKER KARI L) /JUBE REG OPR TEDESCO KNIGHTON SMITH L) INFO (r212 L: REGIOil (2) IDI!G YOUtiGBIDOD GEARIN L) C. IGLES KORRIS LAINAS PROJECT IIADER DICGS L) _STF. ELE BEllAROYA '/EETS (L) EX'ihd;hL DibTdidJiiO;i 1-IDCAL FDR d-DTIE(LAUGH 1IN) (1)(5X9).-NATIONAL LAB'S 1-PDR-SAN /LA/NY d-!? SIC (LUCH/G!/C:) AllL/ORNL/PNL l-GERALD I2LLUCHE l-ASLB-YOF2/Sli92 1-R. CARROLIr00, GT-D22'T 3R00KHAVFli !!AT. IAB LOODW/aD/H. ST. 1-R. CATLIN, A-170-GT l-BOL/J:D, IDAHO FALIE,; !16-CYS ACES EOLDII?G l-CONSULtd7f'S IDAH0(50-331 only) NEWMARK/BLUP2/AGABIAN 1-RD.. MULIER.. F-309GT, e}}

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