ML19323D259

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Forwards Response to IE Bulletin 80-04, Analysis of PWR Main Steam Line Break W/Continued Feedwater Addition. Response Was Sent to a Schwencer on 791130.Postulated Event Would Not Result in Excess Containment Pressure
ML19323D259
Person / Time
Site: Beaver Valley
Issue date: 04/28/1980
From: Dunn C
DUQUESNE LIGHT CO.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-80-04, IEB-80-4, NUDOCS 8005210340
Download: ML19323D259 (1)


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April 28, 1980 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Attn: Boyce H. Grier, Regional Director Region I 631 Park Avenue King of Prussia, Pennsylvania 19406

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 IE Bulletin 80-04

Dear Mr. Grier:

We have completed the reviews required by the referenced bulletin. We l previously transmitted the results of our analysis related to Item 1 of the bulletin to Mr. A. Schwencer on November 30, 1979, a copy of which is attached hereto for your convenience. As set forth in the November 30, 1979, letter, the results of the analysis indicated that the postulated event will not result in a containment pressure greater than that for which the structure has been designed. No other potential water sources were identified during the review, which also considered isolation of the affected steam enerator and extended pump operation at runout flow.

The review of Item 2 has determined that the assumptions in the FSAR are unchanged and that the reactivity is not greater than the reactivity reached in the analysis performed in the FSAR. Based on the results of our review, no corrective action is required.

If you have any questions concerning this response, please contact my ofLice.

Very truly yours, C S/ L C. N. Dunn Vice President, Operations Attachment ec: Office of Inspection and Enforcement Washington, DC 20555 8005210 g, g

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Nove=ber 30, 1979 Director of Nuclear Raactor Regulation United Statas Nuclear Regulatory Commission Attu: A. Schwencer, Chief .

Operating Reactors Branch No. 1 Division of Operating Reactors Washington, DC 20555

Reference:

Beaver Valley Power Station, Unic No. 1 Docket No. 50-334 Auxiliary Feedwater/Contain=ent Pressure Analysis Gentlemen:

Enclosed are six (6) copies of tne results of an analysis of the response of contain=ent pressure to a steam break accident inside contain=ent with extended auxiliary feedwater flow to the affected steam generator.

This analysis was performed as a result of questions asked by members of your staff during the =enth of September, 1979.

The results of this analysis indicate that the postulated event will not result in a containment pressure greater than that for which the structure has been designed.

Very truly yours,

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C. N. Dunn Vice President, Operations Enclosures

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Beaver Valley Power Station, Unit No.-1 racket No. 50-334 Auxiliary Feedwater/ Containment Pressure Analysis Page 2 BLIND COPIES TO: ORC Members I OSC Members i

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.t. Gilbert V. Moore Novenber 7, 1979 Duquesne Light Company 435 Sixth Avenue J.O. NO. 13352.03 Pittaburgh, PA 15219 DLS 15169

Dear Sir:

BEAVER VALIZI PC'dIR STATION - UNIT NO.1 J.O. 30. 13352.03 AUXILIAR$ FIEDVATZR/COHTAINNELT PPSSSURE ANALYSIS This transmittal completes a Stone & Webster analysis affort relative to the effects of a main steamline break (MSLB) on conb4 -ant pressure considering unisolated a W 14= 7 feedvater system (AFS) flows for up to thirty (30) minutes after initiation, as requested by the RRC staff in a : ecent meeting.

At Duquesne's est, S&W attended an NRC meeting on the above subject in Bethesda on 21 / 79 In addition to S&W and Duquasne, VEPCO repre-sentatives were in attendance. As a result of the 9/21/79 meeting, S&W has completed analys is that demonstrate the acceptability of the existing BY-1 AFS with respect to a MSLB and the resulting containne=t pressure transients.

The results of the completed analyses are presented in Attach =ent 1.

These results ars =4M1=* to the prelimicary resulta telecopied by S&W to the NRC on 10/1/79 and supplemented by additional information concerning analysis parameters cn 10/3/79 Both of the telecopied trans=ittals are included as Atta % t 2. The final results (Attachment 1) show a lover peak containment pressure than the pre 14* nan results (Attachment 2).

This reduction is due to the e14*4 nation of mass and energy blevdown that was added to cont =4 mant from the two intact steam genarators in the pre 14=4 n=*y azulysis.

Attachment 2 also contains the important assumptions used in the analyses.

Attach =ent 3 presents the more significant plant parameters for BV-1 that might be useful as a basis to judge the applicability of the BV-1 analysis to sinilar plants. Attachnent 4 shows a simplified sketch of the Auxiliary Feedvater system functicnal arrangenent.

4 ste~s a asistem ~ominamo c:=emar c~ -

f9 The final resulta shown in Attachment 1 demonstrate that the contmWt design pressure (45 peig) is not exceeded hy the ecuti=ned unisolated AFS flow for more then 30 min. am W M that the affluent discharged to W e:n+=4-~at is steam. The analysis also desmerrtrates that for the 4.9 ft2 pressures are reached as a result of the initial blowdown. For break, the 1 4 ft break, the initial peak pressure h t occurs the po p a few minutes after the break occurs is consid=*sd to be the. limiting peak pressure reached for this accident, however h analysis was continued out to 30 minutes at the request of ths MRC staff.

The terminatioca of the pressure transients abown in Attachment 21 ""#

result from tvo different calculational mechanisma. The 4.9 ft break analyais calculates the decrease in heat sources av=47mMa (heattransfer coefficient assumed constant) until AFS temperature is reached. This result3 n i an abrupt decrease of steam flow to the cen+24-t. The 1 4 ft break analysis == W A7S isolation at 30 min. also resulting in an abrupt decrease in steem flow to the con +24--nt.

It should be 4==4ed that ecct24 t pressures predicted at 30 sin.

are unrealistielly high for the 14 ft break since it was assumed that the available energy in the primary system remains nearly constant with ti:ne. Therefore, the steam flow to the contai= ment equivalent to the AFS flow rate to the affected steam generator results in more stanc being generated than the systen can provide results in more steam being generated than the system can provide over a 30 min. time peci. Eased on the analysis evaluation, isolatica of the M 14= 7 feedvater systa=

is not necessary in ordar to preclude con +=4n~=_t e,mynssurination.

E&W requests DLC ayyma.1 to forward Attachment 3 to YEPCO for use as part of their activities related to this same concern for the Surry plants. A ecuperisor. of B7-1 and Surry 1 & 2 parameters was requested by IRC at the 9/21/79 zoeting attended by Duquesce and 7EPCO.

Following telephone conversation with Mr. J. Carey of Duquesne Light Co.,

S&W has re-evaluated the.unisolated feedvater piping volume and the feed-water control valve closure time used in the pre 14m4n=_v analyais and the ayywydatamass of both parsmeters to Beaver Valley Unit 1. S&W utilised a feedvater control valve closure ti=e correspond %g to greater

! than the average of the Beaver Valley 1 test results. Ecwmr, main feed l ficvs consistent with a depressurized steam generator were assuned.

Thus, the mass of main feet,,ater entering the affected generator has been enveloped in the analysis.

l If you have any questions, do not hesitate to call us.

( Very truly yours, b- h-R.M. Stark

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ATTAC'9ENT 2 s s NCTIS OF TELEPHCNE CCIGi2SA ICN Cate of Call: Cetober 1, 1979 J.O.No. 13352.03

Subject:

- EV-1 MAIN STIAM 3REAK AN;1 ISIS participants:

Duquesne Light Cc=pany - Gil Mccre Clifford Du=

Jack Carey Nuclear Regulatory Cc==ission - David Wiggenten Janice Kerrigan Eliner Adensa:

David Sh=

Stone 1. Webster Engineering Ccrp. - W. C. Drotleff E. A. War =an R. M. Stark C. E. Ader F. A. Elia, Jr.

E. A. Thc=as

3. F. Jones As requested by the !EC at their =eeting, Septe=ber 21, 1979, DLC and Siu repcrted the status of the 37-1 =ain stea= line break (in the contai=ent) analysis.

Ass =ptions used in the a=alysis and the preliminary results of the 5V-1 analysis are attached.

Calculated auxiliary feedvater pu=p run-out flow for the broken locp is approxi-

ately 1600 gp=, for the two intact iceps is approximately 200 g= each, 900 g,

cc=ing frc= the turbine driven pu=p and 550 gp= ce=ing frc= each =cter driven pu=p. A contai=ent backpressure of 20 psig was included in the broken icep syste= resistance. In respcuse to the EC's question regarding the change in auxiliary feedvater pu=p-rue. cut flow, SfN stated that 2200 gp= vas based on pu=p characteristics, whereas the 2000 gp= vas based en a =cre detailed analysis including calculated system resistance.

The EC asked for a telecepy of the attached ass =ptiens and tables which are to be =arked prel*-inarf infor=ation, not for decketing.

In addition, the NRC asked for a response to the following questions:

1. khat =ain feedvater isolation valve closing time was used i= the analysis?
2. Khat is the =axi=um =ain stea line volu=e between the breken stea=

generater and the nearest =ain stea: line stop valve?

3. khat is the =axi=u =ain stes: line vol= e between the da= aged stea:

generator step valve a=d the other stes: generator step valves?

!. . khat is the total of 2 and 3 above?

5. 'ahat is the =ax1=s feedwater volume between the =ain feedwater isolation valve and the steam generator?
6. Provide '4estinghouse furrJ.shed = ass / energy release for the 1.1. sq ft break for all power levels available.

A copy of SIP s responses to the above questions is attached. S e responses were sent to NRC, attention Elinor Mensam, 301-492-7617, telecopier number 7371, on October 3, 1979.

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. SfodE 4 kk5SMK Answers to ifRC Cuestions on Prelini .arv _Benv,or Valley 1 Containment Pressure Analysin

1. ht rain feedwater isolation valves closing tine was used in the analysis?

Answer 7.5 sec.

2. ht is the paxi=um main steam line volu=e between the broken steam generator and the nearest main saan line stop valve?

Answer: 985 ft 3(Loop A)

3. ht is the mxi=un min steam line volu=e between the daraged steam generator stop valve and the other steam generator stop valves?

Answer: 8,CCO ft3 (0 used in the analysis)

!. . h t is the total of 2 and 3 above?

Answer: 8,985 ft 3(CS5 used in the analysis)

5. '4 hat is the maxinun feedwater volume between the rain feedwater isolation valve and the steam generator?

Answer: 283 ft 3

6. Provide the Vestingheuse furnished mass and energy release data for the 1./. sq. f t. break for all power levels available.

Response

Vestinghcuse data as inputted to our analysis are given in the I at* ached sheets.  !

4 1

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(PRzux:::;ar :xrCry.AnC:: - syg gT / or p' NCT FCR DCCKzTING)

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1-TELECOPIED -

TIM r / ' ,'

DATr '-

m .// / , ,. R Assumetions. - -

1 Mais steam non-return valve functions instantaneously to isolate the faulted steam generator break from reverse main steam flow.

2. Blowdown rate of the faulted steam generator is calculated by S&'i/W, feedwater flow control valve goes to full open, :ero pressure drop through the steam generator for 3Cf. and 1037. cases.
3. The two intact steam generators stay pressurized.
4. Stean generators are isolated by centrols sensing the break.
5. Auxiliary feedwater flow is available within ten seconds, with run-out flow going preferentially to the faulted stea= generater per syste=

hydraulics.

6. Heat transfer coefficient is constant, heat transfer vs. ti=e per computer code. (~ 1200 BTU /lb)
7. Containment backpressure is 20 psig for all cases, e

. 8. Single active failure is one CI3 resulting in mini =us safegua5ds; i.e., failure of one-half of the contain=ent sprays.

9. No operator actier. is assu=ed.
10. All auxiliary pu=ps operational.

Footnotes (1 ) . Initial Conditions - 10.4 PSIA, Service '4ater T = 86 F, Tc = 105 (SAT)

(2). Initial Conditions - 11.6 PSIA, Service 'iater T = 32 F, Tc = "C5 (SAT)

(PP2LI:2 NARY II:FCFy.ATICN -

1:0T FOR DCCKETING)

3R ELIMLNARY Su==ary of R sults of B.V.1 Cont. Pr:ssura Analys^^i Initial Time of Steamline Reactor Peak- Initial Pressure S.G. 31cvdown Power Pressure Peak @ 18CO see

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ATTACllMDIT 3 ,

PAllAMETEllS RELATED .TO HSLB IN CONTAINHENT 2

Break Sizen Considered 4.9, 1 4 ft Steam Generator Inventory 0% power 150,000 lb o 1020 paia, 1192 DTU/lb 30% power 136,000 lb d 929 pain, 1195 BTU /lb 102% power 108,000 lb & 782 psia, 1200 DTU/lb Main Feedwater added to affected St.eam Generator 28,836 lb 8 416 BTU /lb Main Steam line backflow to break 2258 lb e 1192 BTU /lb AFS runout flow to affect.ed St, cam Generator 1594 gpm d 35 pain backpressure Quench Spray Flow Rate 2030 gpm/ train a 55 psia containment, pressuro, full RWST R2 circulation Spray Flow Rate 6300 gpm/ train Quench Spray IIcat Removal Rate 3.42 X 106 BTU / min /t. rain @ 270 F containment Recirculation Spray lleat Removal Rate 6.35 X 106 BTU / min / train a 270 F containment, 240 F ausp Spray Start, Time QS-1 min., RS-5 min.

Containment Free Volume 1,800,000 Ft3 DTU's availablo above 320F 649.8 X 10 DTU (excluding decay beat) lisat, sinks Surface Area .

2 Liner 73,300 ft Stool 156,800 ft 22 Concreto 152,400 ft St. eel Mass 2.65 I 106 73

ATTACHMENT 4 l 1A i n 16"

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