ML20107A035

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Ack Receipt of Requesting Revised Curves Representing Limits for Average Planar Linear Heat Generator Rate for GE Type I & II Fuel Assemblies in Plant Reactor
ML20107A035
Person / Time
Site: Oyster Creek
Issue date: 11/05/1973
From: Finfrock I
JERSEY CENTRAL POWER & LIGHT CO.
To: Skovholt D
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML18039A986 List: ... further results
References
FOIA-95-258 NUDOCS 9604120109
Download: ML20107A035 (6)
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MADisO,N AVENUE AT PUNCH BOWL ROAD

  • MORRisTOWN. N. J. 07960
  • 201-539-6111 minNO N TMF General {

Pubhc Uhhties Corporation m,a.

November 5, 1973 2.

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Mr. Donald J. Skovholt

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,@N@W Assistant Director for Operating Reactors Directorate of Licensing r3 ~1 United States Atomic Energy Commission Washington, D. C. 20545

Dear Mr. Skovholt:

By letter dated October 26, 1973, you requested revised curves representing the limits for the average planar linear heat generator rate for GE Type I and II fuel assemblies in the Oyster Creek reactor.

These revised curves are to present the results of detailed heatup calculations following a pos tulated LOCA at exposures greater than 15,003 KJJ/T.

i By letter dated October 31, 1973, you requested similar calcu-lations and curves defining limiting conditions for the EXXON Type III-E fuel in the Oyster Creek reactnr. These calculations were to be dcae under specified conditioris. ' Further, a sensitivity analysis was requested in support of our September 7,1973, Request for Change to the Oyster Creek Technical Specifications.

Attachment I presents the revised limiting curves for Types I, II, and.III-E fuel. The limiting curve for Type III fuel is also shown for completeness. These curves were generated using the conditions specified in your two letters.

1

1 presents the results of a parametric study j

performed to measure the sensitivity of the peak clad temperature to changes in the spray heat transfer coefficients at the time of passive rod quenching and to changes in quenching time, In short, this study shows that under the worst case assumption, reduction of the applicable spray heat. transfer coefficients to a value of zero at the time of passive rod wetting, the calculated peak clad terrperature is increased by only 6 F.

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9604'120109 960213

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PDR FOIA

-DEKOK95-258 PDR

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' Mr. Donald ~ J. 'Skovholt l

Page:11. _

November 5,1973.

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'In~ view of the power derate 'effhet at Oyster Creek as a result of_the August 24. 1973 AEC order to change the Oyster Creek Technical Specifications, it is requested that a timely review be performed and approval be granted in this matter.

Very truly yours, L 6 :/ ~//

(-

O Ivan R. Finfrock, Jr.

Vice President j

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ATTACIDOTT II.

u Requested Parametric Study -- Exxon Type III-E Puel

Parametric studies were performed to illustrate. the sensitivity' ofIthe peak cla'd temperature,to the assumed in'ert spacer capture rod wetting time and.to assumed ~ variations'in the spray heat transfer icoefficients'occuringatthattime.- The ac'suraed spacer capture rod
wetting time-was varied from the, time of rated spray to the previously calculated conservative Yamanouchi quench time. For each case the spray coefficients for rod groups 3 and 4 were halved at the assumed I

spacer capture rod wettinC-time.

The results of these calculations

/ are given in-Table 1.

In addition, as a further. ineature of the sensitivity

. of PCT to the assumed spray' heat tronsfer coefficients, the spray hsat transfer coefficients for rod crcups 3 and 4 were ucs ned to drop to zere i

i concurrently with an assumed spacer capture rod wetting time of 200 sec5nds.

The results of this assumption is shown on the last line of

Table 1.

Ac the analysis indicates, the poch clad tercernt'.tre is

~ relatively insensitive to the time of assuaed spacer capture rod uctting, even uhon it is accampanied by ve:y conservative at::er.ed chanEes in i

the sprey heat transfer coefficients.

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SPRAY COEFFICIDIT AIMLYSIS MAPUiGR = 10 94 kw/ft.

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INPUT SCR Wet PEAK CLAD TIMP i-eff*

Time (sec) eff Time (sec)

Time (sec) Time (sec)-

Rod No**

Terp(+ -

100%

35-m 560 204 2193 100%

35-36 50%

36 -co 36 150 9

2173

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50 - m 50 150 9

2170

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35-75 50%

75 -m 75-150 9

2166 100%

35-100 50%

.100 - cc 100 150 9

2165 100%'35-125 50%

125 - cn 125 150 9

1266

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10u%

35.L50.

50%

150 -cc 150 150 34 2171

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35-175 50%

175 -m 175 175 15 2189 100%-

35-200 50%

200 -co 200 200 15 2200-i 100%

35-225 50%

225 - m 225 204 15-219E 100%

35-250 50%

250 -co 250 204 15 219' 100%

35-375 50%

375 -ce 375 204 15 2193

-100%

35-500 50%

500 -co 500 204 15 2199 100%

35-200 of 200 -co 200 200 15 22:i 2O

  • EffectivospraycoefficientinDtu/hr-ft-F:

h 100% eff: Group 3 = 1 5 Grour 4,1.75 h

50% efr: Group 3 = 0.75 Group 4 = 0.875 h

0% efr: Group'3 = 0.0 Group h = 0.0

+^See Figure 1 for rod w: iib'ering rysten.

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