ML18019A395

Forwards Addl Info Re Revised Pressure/Temp Curves in Response to SER Confirmatory Item 11.Allowances for Differences Between RCS Temp & Reactor Vessel Flange Region Temp Discussed

ML18019A395
Person / Time
Site:	Harris
Issue date:	09/26/1985
From:	Zimmerman S CAROLINA POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NLS-85-337, NUDOCS 8510010041
Download: ML18019A395 (8)

Text

REGU TORY 1NFORMATION DISTRIBU N

SYSTEM (RIOS)

ACCESSION NBR 'r85.1 0010041 OOC, DATE: 85/09/26 NOTARIZED; NO FACIL:50 400 Shearon Harris Nuclear Power Plant'E Unit 1E Carolina 4UTH ~ NAMEl AUTHOR AFFILIAT'ION ZIHHERMANPS ~ R, Carolina Power L Light Co ~

REC IP ~ NAME>>

RECIPIENT AFFILIATION DENTONiH.RS Office'f Nuclear Reactor Regulationi Director POCKET 05000400

SUBJECT:

Forwards addi info re revised pressure/temp curves*in.

response to SER Confirmatory I.tern 11.Allowances for differences between RCS temp L reactor. vessel flange>> region temp discussed, DISTRIBUTION CODE:

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CNK Carolina Power 8 Light Company SEP 3 6.1985 SERIAL: NLS-85-337 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO.

1 - DOCKET NO.50-000 REVISED PRESSURE/TEMPERATURE CURVE

Dear Mr. Denton:

Carolina Power dc Light Company hereby submits additional information concerning revised pressure/temperature curves for the Shearon Harris Nuclear Power Plant (SHNPP).

This information is submitted in response to Safety Evaluation Report (SER)

Confirmatory Item 1 1 from the Materials Engineering Branch and supplements our previous response dated November 11, 1980.

The attached information responds to a follow-up question from the NRC reviewer concerning allowances for differences between the Reactor Coolant System temperature and the Reactor Vessel Flange region temperature.

If you have any further questions on the subject or require additional information, please contact me.

3DK/crs (19393DK)

Attachment Yours very truly,

/pe~~~

S. R. Zi merman Manager Nuclear Licensing Section CC:

Mr. B. C. Buckley (NRC Mr. B. 3. Elliot (NRC-MTEB)

Mr. G. F. Maxwell (NRC-SHNPP)

Dr. 3. Nelson Grace (NRC-RII)

Mr. Travis Payne (KUDZU)

Mr. Daniel F. Read (CHANGE/ELP)

Wake County Public Library Mr. Wells Eddelman Mr. 3ohn D. Runkle Dt.. Richard D. Wilson Mr. G. O. Bright (ASLB)

Dr. 3. H. Carpenter (ASLB)

Mr. 3. L. Kelley (ASLB) 8510010041 85092b PDR ADOCK 05000440 E

PDR 411 Fayettevilte Street

~ P. O. Box 1551

~ Raleigh, N. C. 27602 pya /

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Shearon Harris Nuclear Power Plant SER Confirmatory Item No. 11 Pressure/Tem erature Curve Provide additional information concerning the allowance for temperature differences between the RCS coolant temperature and the Reactor Vessel Flange region temperature.

~Res onse The critical regions of interest for the temperature lag during normal heatup in the closure head and vessel flange regions are cross sections I and 2 shown in Figure 1. A finite element model was used for the analysis to obtain temperature gradients caused by heatup transients.

Allexterior surfaces of the model were assumed to be perfectly insulated and, therefore, adiabatic.

Figure 2 shows the thermal boundary conditions.

The temperature lags in the reactor vessel closure head flange and vessel flange were determined for the lower temperature region of heatup transients where the new 10 CFR 50 rule is applicable.

The new 10 CFR 50 Appendix G rule requires that when the pressure exceeds 20 percent of the preservice hydrostatic test pressure the temperature of the closure head and vessel flange regions must exceed the material RTNDT by at least 120 degrees F for normal operation.

For SHNPP, 20 percent of the preservice hydrostatic test pressure is 621 psig.

The minimum temperature of the SHNPP closure head flange region is 128 degrees F since the limiting RTNDT is 8 degrees F. The minimum temperature of the vessel flange region is 112 degrees s>nce the RTNDT is negative 8 degrees F.

During the 60 degree F per hour heatup transient, the temperature at the outside surface at cross section 1, of Figure 1, lags the coolant temperature by 58.1 degrees F.

In order for the metal temperature at this location to be 128 degrees F, the coolant temperature has to be 58.1 degrees above 128 degrees F or 186.1 degrees F. The Figure 1, cross section 2, temperature lag is 51.2 degrees F during the 60 degrees F per hour heatup transient, and the coolant temperature has to be 163.2 degrees F-for the metal temperature to be 112 degrees F. As a result, the new 10 CFR 50 rule including temperature lag limits the SHNPP pressure to 621 psig until a coolant temperature of 186 degrees F is reached.

Comparison of this pressure-temperature point with Figure 3 shows that the new 10 CFR 50 rule does not impact the SHNPP 60 degrees F per hour heatup curve.

During the 100 degree F per hour heatup transient, the temperature at the outside surface of Figure 1, cross section 1, lags the coolant temperature by 70.1 degrees F.

In order for the metal temperature at this location to be 128 degrees F, the coolant temperature has to be 70.1 degrees F above 128 degrees F or 202.1 degrees F. The Figure 1, cross section 2, temperature lag is 92.8 degrees F during the 100 degree F per hour heatup transient; and the coolant temperature has to be 200.8 degrees F for the metal temperature to be 112 degrees F.

As a result, the new 10 CFR 50 rule including temperature lag limits SHNPP pressure to 621 psig until a coolant temperature of 200.8 degrees F is reached.

Comparison of this pressure-temperature point with Figure 3 shows that the new 10 CFR 50 rule does not impact the SHNPP 100 degree per hour heatup curve.

Based on the above, the current heatup and cooldown curves are more limiting than the new 10 CFR 50 Appendix G rule.

(1939JDK/cr s)

FIGURE 1

CRITICAL CROSS SECTIONS SECTION 1

SECTION 2

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FISIIRE 2 THERNL BOUNDARY'ONDITIONS ADIABATIC ADIABATIC

FZ&MRE 3000 CRITICALITYLIMIT FOR 60 F/HR HEATUP RATE LEAK TEST LIMIT (g

2000 D

tuK D

I-O 0

1000 MATERIALPROPERTY BASIS CONTROLLING MATERIAL:PLATE METAL COPPER CONTENT: 0.10 WT/o PHOSPHORUS CONTENT: 0.006 WT%

RTNDT INITIAL'0F RTNDT AFTER 5 EFPY: 1/4T, 155 F

3/4T, 135oF CURVE APPLICABLE FOR HEATUP RATES UP TO 60 F/HR FOR THE SERVICE PERIOD UP TO 5 EFPY AND CONTAINS MARGINS OF 10 F AND 60 PSIG FOR POSSIBLE INSTRUMENT ERROR CRITICALITY LIMIT FOR 100oF/HR HEATUP RATE HEATUP RATE 60oF/HR 100 F/HR CRITICALITYLIMIT BASED ON INSERVICE HYDROSTATIC TEST TEMPERATURE (295 F)

FOR THE SERVICE PERIOD UP TO 5 EFPY 100 200 300 400 500 INDICATEDTEMPERATuRE

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SHEARON HARRIS NUCLEAR POWER PLANT Carolina Power 5 Light Company SHEARON HARRIS (CQL)

REACTOR COOLANT SYSTEM HEATUP LIMITATIONS APP LICABLE FOR 5 EFP Y