ML053320312

Reactor Vessel CMTRs (Non-Proprietary)

ML053320312
Person / Time
Site:	Point Beach
Issue date:	11/18/2005
From:	Westinghouse
To:	Office of Nuclear Reactor Regulation
References
WEP-05-318 NP
Download: ML053320312 (17)

Text

WESTINGHOUSE NON-PROPRIETARY CLASS 3 WEP-05-318 NP-Attachment Point Beach Unit 2 Reactor Vessel CMTRs Westinghouse Electric Company LLC P.O. Box 355 Pittsburgh, PA 15230-0355 0 2005 Westinghouse Electric Company LLC All Rights Reserved Page I of 13

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9

ENCLOSURE 2 WESTINGHOUSE REPORT "POINT BEACH UNIT 1, CYCLE 29 - REACTOR VESSEL UPPER CLOSURE HEAD VOLUME BEST-ESTIMATE MEAN FLUID TEMPERATURE",

WEP-05-168, REVISION 1, DATED JUNE 20,2005 (NON-PROPRIETARY)

(3 pages follow)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 Westinghouse Westinghouse Electric Company Nuclear Services P.O. Box 355 Pittsburgh, Pennsylvania 15230-0355 USA June 20 2005 WEP-05-168, Rev. 1-NP Mr. Rob Chapman Nuclear Management Company Point Beach Nuclear Plant 6610 Nuclear Road Two Rivers, WI 54241 Nuclear Management Company Point Beach Unit 1 Point Beach Unit 1, Cycle 29 - Reactor Vessel Upper Closure Head Volume Best-Estimate Mean Fluid Temperature

References:

1. Westinghouse Letter LTR-EMT-0 1-52, "Point Beach Units 1 and 2 - RSG/Fuel Upgrade Reactor Internals Engineering Report," April 2, 2001.

2. Westinghouse Letter LTR-EMT-02-258, "Point Beach Units I and 2 - Upper Head Mean Fluid Temperature for Flaw Handbook Calculation," September 16, 2002.

3. WCAP-14000-P, Rev. 2, "Structural Integrity Evaluation of Reactor Vessel Upper Head Penetrations to Support Continued Operation: Point Beach Units 1 and 2," September 2004.

4. Point Beach Nuclear Plant Letter NPL 2005-0084, Original Issue, "Transmittal Of Design Information Relating To Purchase Order P304307 Line Item 7 For Unit I Cycle 29 Reactor Vessel Upper Head Mean Fluid Temperature Analysis," May 2, 2005.

5. WCAP-16233-P, Rev. 0, "The Nuclear Design and Core Management of the Point Beach Unit I Nuclear Reactor, Cycle 29," March 2004.

6. Westinghouse Calculation Note CN-RCDA-05-53, Rev. 0, "Calculation of the Reactor Vessel Upper Closure Head Volume Best-Estimate Mean Fluid Temperature for Point Beach Unit 1 Cycle 29," May 17, 2005.

7. LTR-RCDA-05-379, Rev. 1

8. NMC Purchase Order No. P304307 Rev. 4, Line Item 7 -

9. Westinghouse Sales Order No. 34273 Westinghouse Electric Company LLC P.O. Box 355 Pittsburgh, PA 15230-0355

© 2005 Westinghouse Electric Company LLC All Rights Reserved A BNFL Group company

Page 2of3 WEP-05-168, Rev. I-NP

Dear Mr. Chapman:

The following evaluation is being provided in response to the Reference 8 NMC purchase order.

In September 2002, the mean temperature of the primary coolant that occupies the reactor vessel upper closure head volume was estimated to be 5981F at 100% steady-state full-power operation for Point Beach Unit 1. This estimated temperature was developed for use in the Flaw Handbook and took into account the effects of a low-leakage core loading pattern with hafnium absorbers, the 1.7% mini power uprate, and the effect of utilizing the best-estimate flow.

The 5980F value was estimated as follows:

1)

The mean fluid temperature of the reactor vessel upper closure head volume reported in Reference [1] was [

]' ¢F and was based on the following reactor coolant system (RCS) conditions.

Core power of 1650 MWt Core inlet temperature of 542.50F Thermal design flow of 89,000 gpm/loop Pressure of 2250 psia

2)

The effect of the low-leakage core loading pattern with hafnium absorbers is an increase to the mean fluid temperature of the reactor vessel upper closure head volume. It was estimated that this effect was approximately [ ] c 'F.

3)

The effect of the 1.7% mini power uprate is an increase to the mean fluid temperature of the reactor vessel closure head volume. It was estimated that this effect is approximately

[

]COF

4)

The effect of the using the best-estimate flow instead of the thermal design flow is a decrease to the mean fluid temperature of the reactor vessel closure head volume. It was estimated that this effect is approximately [

C 0F.

As a result, the estimated mean fluid temperature of the reactor vessel upper closure head volume, transmitted by Reference [2], for use in the Flaw Handbook calculation (Reference [3])

for Point Beach Unit 1 was:

[

]cOF+[ ]coF+[]coF-[

]coF=598OF Recently, a request was received from the Nuclear Management Company (NMC) to estimate the mean fluid temperature of the reactor vessel upper closure head volume based on the actual operating conditions for Point Beach Unit 1, cycle 29. These actual operating conditions for Point Beach Unit 1 were provided in Reference [4] and are presented below. The effect of the average cycle 29 core power distributions was also included in the calculations for the cycle 29 specific estimated mean fluid temperature of the reactor vessel upper closure head volume. The cycle 29 core assemblywise power distributions were obtained from Reference [5].

Official record electronically approved in EDMS A BN FL Group company

Page 3of3 WEP-05-168, Rev. I-NP Point Beach Unit 1 - Actual Operating Conditions (Reference [4])

Core thermal power 1540 MWt RCS total flow 190,912 gpm Vessel inlet temperature 541.610F RCS Pressure 2232.0 psig Removal of the part-length control rod drive mechanisms (CRDMs) with no upper guide tube flow restrictors installed.

Using the Point Beach Unit 1 actual operating conditions (shown above) and the cycle 29 core assemblyxvise power distributions, the best-estimate mean fluid temperature of the reactor vessel upper closure head volume averaged over the cycle was calculated to be 593.90F. This value is not an estimated value like the 5980F temperature, but is calculated using the methodology developed by Westinghouse and verified through scale model testing and in-plant measurements.

The Point Beach Unit 1 best-estimate mean fluid temperature of the reactor vessel upper closure head volume for cycle 29 is documented in Reference [6].

If you have any questions regarding the above please call Kevin Neubert at 412-374-6608 or the undersigned.

Very truly yours, WESTINGHOUSE ELECTRIC COMPANY Kerry B. Hanahan Customer Project Manager Official record electronically approved in EDMS A BNFL Group company