ML20207E102

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Telcon W/Util,Nrc & Westinghouse to Discuss Bart Code Assessment
ML20207E102
Person / Time
Site: South Texas  STP Nuclear Operating Company icon.png
Issue date: 07/02/1986
From: Powell M
HOUSTON LIGHTING & POWER CO.
To:
References
NUDOCS 8607220262
Download: ML20207E102 (3)


Text

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HOUSTON UGHTING & POWER COMPANY f d hMf SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION 60M4 y TELEPHONE MINUTES CORRESPONDENCE SERI AL NUMBE R M. R. Wisenburg ST-HL-HL-35793 TO:

"" 0 FROM:

/

July 2, 1986 PRIMARY. G25 SECONDARY-DATE OF CALL:

BART Code Assessment TELECON PARTICIPANTS: M. R. Wisenburg (HIAP) S. Ehrenpreis (H)

(INCLUDE NAME AND M. E. Powell (HL&P) B. McIntyre (W)

ORG ANIZATION OF EACH) D. Ashton (BEC) J. Wilson (USNRC)

W. Spezialetti (H) P. Kadambi (USNRC) PAGE 1 OF 3 A conference call was held to discuss the recent discussions between Westinghouse (H) and the NRC on the changes to the BART code and the impact, if -

any, to the South Texas Project (STP). The BART code is used in the H ECCS evaluations. The call was requested by the NRC Licensing Project Manager.

B. McIntyre (W) r.ummarized the recent events regarding the BART code. By letter dated June 2,1986, H notified the NRC of an assessment completed by W regarding the removal of a hot assembly power adjustment, originally included to account for thimbles, from the BART code methodology. The effect of thimbles on flooding rate was found to have a small (6-12 F) effect on plants analyzed with the 1978 and 1981 versicas of the H ECCS evaluation model. H found that the ue tel heat model in these analyses is, overl[consersative ,

compared with thc approved model used in the analyses using BART. If a more accurate calculation of the metal heat flow is included in the analysis the net ettect ot the above changes is a reduced peak clad temperature (PCT).

'ine ellect of thimbles on 11ooding rate was found to have a somewhat larger effect on plants analyzed with BART and could not be reduced by taking

( credit for reduced metal heat flow. The effect ranged from 10 F to 20 F. In addition, these plants were further impacted by the need to remove a hot assembly power adjustment (originally included to account for thimbles) which I

was found to be inappropriate for BART. The combined effect of the thimbles on flooding rate and of removing the hot assembly power adjustment was found Ll/Telmin/pb 8607220262 860702 PDR ADOCK 05000498 A PDR STP-103 (6-79)

. HOUSTON UGHTING & POWER COMPANY SOUTH TEXAS PROJECT ELECTRIC CENERATING STATION j TELEPHONE MINUTES CORRESPONDENCE SE RI AL NUMBE R M. R. Wisenburg ST-HL-HL-35793 TO:

FROM: M. E. Powell SUBJECT FILE NUMBERS July 2, 1986 PRIMARY. G25 SECONDARY -

DATE OF CALL:

SUBJECT:

TELECON PARTICIPANTS: M. R. Wisenburg (HL&P) S. Ehrenpreis (E)

(INCLUDE NAME AND M. E. Powell (H14P) B. McIntyre (H)

ORGANIZATION OF EACH) D. Ashton (BEC) J. Wilson (USNRC) PAGE 2 OF 3 W. Spezialetti (H) P. Kadambi (USNRC) to be offset by conservatisms currently contained in BART, resulting in a net benefit. Thus, an analysis repeated with the required model changes and with ,

the identified conservatisms removed will result in a lower peak clad temperature than the one currently on record. For example, in the case of STP, the previously calculated PCT was approximately 1999 F. Using the revised BART code, the calculated PCT is approximately 1991 F.

Mr. McIntyre also stated that the changes to BART have also been discussed in a recent meeting with the NRC.

Mr. Wilson (USNRC) acknowledged the above information and was familiar with the issue. He stated that there is currently no safety concern but a regulatory concern in that 10CFR50.46 requires the use of approved codes and that the latest revision of BART is not yet considered to be approved. He stated that the NRC needs to " straighten out" whether or not y plants meet 10CFR5').46 using approvec codes. He concluded that the NRC is currently reviewing the E submittal of June 2,1986 and anticipates that there will not be any impacts to the licensing of the STP. He stated that the only plant being impacted by this issue is Seabrook which is trying to get an 0.L. this month.

Mr. Kadambi indicated that his concerns on this issue were resolved.

nr.r/yo Ll/Telmin/pb STP-103 (6-79)

, HOUSTON UGHTING & POWER COMPANY SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION TELEPHONE MINUTES 1

CORRESPONDENCE SERI AL NUMBER M. R. Wisenburg ST-HL-HL-35793 TO:

FROM: M. E. Powell SUBJECT FILE NUMBERS uy , 1986 PRIMARY: G25 SECONDARY-DATE OF CALL:

BART Code Assessment 3

TELECON PARTICIPANTS: M. R. Wisenburg (HIAP) S. Ehrenpreis (H)

(INCLUDE NAME AND M. E. Powell (HL&P) B. McIntyre (H)

ORGANIZATION OF EACH) D. Ashton (BEC) J., Wilson (USNRC)

PAGE 3 OF 3 W. Spezialetti (H) P. Kadambi (USNRC)-

cc: J. N. Bailey J. S. Phelps ,

A. W. Harrison M. A. McBurnett L. Schlazer D. Ashton (BEC)

P. G. Trudel (BEC)

J. K. Atwell (BEC W. Spezialetti (W)

R. Sweeney (Bethesda Licensing Office)

T. Roberson (Bethesda Licensing Office)

STP RMS (2)

Ll/Telmin/pb STP 103 (6-79)