ML20212Q676

Forwards PECO-FMS-001, Steady-State Thermal Hydraulic Analysis of Peach Bottom Units 2 & 3 Using Fibwr Computer Code & PECO-FMS-002, Methods for Transient Critical Power Ratio for BWRs (RETRAN-TCPPECO). Fee Paid

ML20212Q676
Person / Time
Site:	Peach Bottom
Issue date:	08/29/1986
From:	Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Muller D Office of Nuclear Reactor Regulation
Shared Package
ML20212Q678	List: ML20212Q676 ML20212Q686 ML20212Q691
References
NUDOCS 8609050350
Download: ML20212Q676 (2)

Text

PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 swistos L DAtinorr

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August 29, 1986 Docket No. 50-278 Mr. D. R. Muller, Director BWR PD #2 Division of BWR Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

SUBJECT:

Philadelphia Electric Company In-House Reload Licensing

Dear Mr. Muller:

Enclosed for NRC review and approval are 40 copies each of topical reports PECO-FMS-001, " Steady-State Thermal Hydraulic Analysis of Peach Bottom Units 2 and 3 Using the FIBWR Computer Code" and PECO-FMS-002, " Method for Transient Critical Power Ratios for Boiling Water Reactors (RETRAN-TCPPECO)". These reports are part of our preparation for performing in-house reload licensing analyses for Peach Bottom Units 2 and 3, commencing with Unit 3, Reload 7 in 1988. An outline of this program was presented to the NRC staff at an informal meeting in Bethesda on July 8, 1986.

We expect to submit four additional topical reports to the NRC for similar review in April of 1987. These six topical reports will completely describe the methodology to be used in performance of PEco in-house reload licensing analyses.

Also enclosed is a partial list of the computer codes to be used by PECo in reload licensing analyses. These codes have been reviewed and approved by the NRC staff for use in the Yankee Atomic Electric Company (YAEC) reload licensing program.

Copies of the applicable SER's are attached. Significant modifications made by PECo to the approved codes are also listed.

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Mr. D. R. Muller, USNRC August 29, 1986 Page 2 of 2 The staff expressed particular interest in the TCPPECO couputer code during the July 8 meeting,.as it appeared this was a completely new, unreviewed code. TCPPECO is, in fact, very similar to YAEC code TCPYA01, which has been reviewed and approved by the staff. Therefore, additional documentation to explain and support TCPPECO has not been included.

In accordance with Section 170.12 of the Commission's regulations, a check for $150 is enclosed.

Should you have any questions or require additional information, please do not hesitate to contact us.

Very truly yours,

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Enclosures

PHILAIELPHIA PrlFYTRIC CCNPANY COIES USED IN REIIRD LICENSING

'IHAT HAVS BEEN REVIEWED BY 'IHE USNRC PECo (YnFS NIC REVIEW DIFFERE2CES CN1 Reference il No majcr changes in the ethodology emplcyed. Changes obtained through EPRI YAEC-1232 and Sttrisvik (co3e vendor) to (1) edit 2-3 cross sections for linkage to (IPHIN/PDQ, (2) utilize ENDFB V delayed neutron data, instemi of the EtOFB III data contained in original code, (3) edit Samarium and in-core detector cross sections, (4) inprove boundary conditions used in transport theory calculations, (5) an assortment of small code fixups to correct code execution problems encountered on IBM cperating systems. Any effects proSuced by above changes have been properly tested anS documented in the PECo CASIO code V&V report.

SIMLATE-E Reference il Nuclear and hydraulics calculations enploy sam basic methods as described YAEC-1238 in YAEC-1238, and YAEC-1234. Changes developed by EPRI and PECo for: (1) installation of FIDWR thermal hydraulics calculations within SINLATE-E, (2) calculation an3 edit of thermal mrgins arri pre-conditioning envelope.

Sese ernploy process cmputer algorithyms, sudi as the GEXL correlation for prediction of CPR, (3) incorporation of mderator temperature dependency in cross sections. Eis is an enhancement to inprove prediction of cold criticality, (4) inproved interpolation schemes for lookup of cross sections and prediction of detector instrument readings, (5) an assortment of small code fixups to provide aS3itional edits, as well as to correct code execution problem encountered on IBM operating systems. Any effects produced by above changes have been properly tested an3 doctznented in the PECo SIMLATE-E code V&V report.

RETRAN-02 Reference 12 Energy Incorporated's new control rod model and error corrections to RE' IRAN-02 since the issuance of the SER.

'ICPPECO Reference il None.

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PHILANTPIIIA ENC 001PANY COIES USED IN RELDAD LICENSING UIAT HAVE BEEN RWIENID BY 'IIIE USNRC PECo CODES NBC R NIEN Di m .ui2CES FIBNR Reference #1 Added edit to printout axial flow density, void fraction, and relative YAT-1234 density.

FRWSTEY Reference #3 Addition of G.E. material properties routines - specifically equations for YAEC-1249-P thermal condtx:tivity ard thermal expansion of U02 and Gd203/UO2.

YAEC-1265-P mud 2CE #1: Ictter, D.B. Vassallo (NIC) to J. B. Sinclair (YAEC) dated 9/15/82, NW 82-157, Docket No. 50-271.

mudiCE #2: Safety Evaluation Report RETRAN - A Program for Transient Thermal-Hydraulic Analysis of Cmplex Fluid Systems, NRC Transmittal Letter from Thomas, C.O. to Schnatz, T.W. , September 23, 1982.

Frtu<BNCE #3: Ictter, D.B. Vassallo (NRC) to R. W. Capstick (YAT) dated 9/27/85, NW 85-205, Docket No. 50-271.

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