ML19249D577
| ML19249D577 | |
| Person / Time | |
|---|---|
| Issue date: | 08/21/1979 |
| From: | Baer R Office of Nuclear Reactor Regulation |
| To: | Scherer A ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY |
| Shared Package | |
| ML19249D578 | List: |
| References | |
| NUDOCS 7909240868 | |
| Download: ML19249D577 (2) | |
Text
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UNITED STATES
!"yg ',j NUCLEAR REGULATORY COMMISSION
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AUG 211979 Mr. A. E. Scherer Combustion Engineering, Inc.
1000 Prospect Hill Road Windsor, Connecticut 06095
Dear Mr. Scherer:
SUBJECT:
STAFF EVALUATION OF CENPD-198-P On January 16, 1978 and November 9,1978, Combustion Engineering (CE) submitted Supplement Nos. I and 2 to CENPD-198-P, "Zircaloy Growth: Application of Zi r-caloy Irradiation Growth Correlations by the Calculation of Fuel Assembly and Fuel Rod Growth Allowances."
These supplements were submitted in response to the staff's initial evaluation of CENPD-198-P issued June 22, 1976 and sub-sequent letters and discussions on the use of zircaloy growth correlations in CENPD-198-P. We have completed our review of Supplement Nos.1-P and 2-P to CENPD-198-P.
Our evaluation is presented in the Enclosure and is summarized below.
We have concluded that the CENPD-198-P and Supplement Nos.1-P and 2-P (CENPD-198-P) acceptable for reference in license applications involving the calcula-tion of allowances for (1) fuel assembly axial growth and (2) differential axial growth between fuel rods and the fuel assembly structure. There are, however, two conditions governing our approval. First, because the growth characteristics of zircaloy cmponents are sensitive to the fabrication process, we will require that, where the approved version of CENPD-198-P is referenced in future applications, a description be given of the metallurgical state of the components being analyzed.
If in our judgement the metallurgical condition of those components does not differ significantly from those described in CENPD-198-P, then the description may be brief and CENPD-198-P may be used; otherwise, the use of CESPD-198-P must be justified. Second, our approval of this topical fast neutron fluences not exceeding 4X10' fn/cm{ responding to axially averaged report is limited to zircaloy growth strqns co (E>0.321 Mev), an exposure above which CE has not reported growth strain data on CE zircaloy core compo-nent We gnticipate that growth strains due to exposures in excess of 4X10g /ccr(22500 mwd /t) will not exceed those strains predicted by the extra-fn polation of the CE growth correlations. However, individual safety analysis reports that reference CENPD-198-P for zircaloy growth analyses must either provide for confirmatory measurements in thir suryeillance programs for zir-caloy growth at fluences greater than 4x10 fn/cn or cite similar data.
Should our criteria or regulations change such that our conclusions concerning CENPD-198-P are invalidated, you will be notified and given an cpportunity to revise and resubmit ycur topical report shocid you so desire.
7 909 240 [g 8 (
Mr. A. E. Scherer
- AUG 2 ! 97g 1
It is' requested that CENPD-198-P be resubmitted as an approved report and that the follcwing letters be incorporated as part of the document:
(1) this approval letter and evaluation, (2) the approval letter and evaluation issued on June 22, 1976, (3) CE's letter to the NRC on CENPD-198-P dated August 16, 1976 and (4) NRC's letter to CE dated November 4,1976. When CENPD-198-P is referenced in a license application, the non-proprietary version should also be referenced. We do not intend to repeat our re"iew of this report when it appears as a reference in a particular license application.
Sincerely, 4
Robert L. Baer, Chief j
Light Water Reactors Branch No. 2 Division of Project Management
Enclosure:
Evaluation of CENPD-198-P 9
e 999 336 6
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