ML20215N223
| ML20215N223 | |
| Person / Time | |
|---|---|
| Issue date: | 10/29/1986 |
| From: | Rossi C Office of Nuclear Reactor Regulation |
| To: | Ward G SIEMENS POWER CORP. (FORMERLY SIEMENS NUCLEAR POWER |
| References | |
| NUDOCS 8611050025 | |
| Download: ML20215N223 (3) | |
Text
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Mr. G. N. Ward, Manager Reload Licensing Exxon Nuclear Company, Inc.
2101 Horn Rapids Road P. 0. Box 130 Richland, WA 99352 00T 2 9 W
Dear Mr. Ward:
During the review of ENC's extended burnup topical report XN-NF-82-06, Revision 1, several ENC letters and supplements were.provided which contained additional information requested by the staff. These were referenced in the staff's safety evaluation report (C. E. Rossi letter to G. N. Ward, July 18,1986). Not all of this information was used in our SER.
Per your request to Mr. R. Lobel of my staff, we are providing additional information regarding which sections of each supplement to XN-NF-82-06, Revision I are acceptable.
Due to different criteria and analy$1s methods for evaluating end-of-life (E0L) rod internal pressures presented by ENC in several references, only two references were found to be acceptable for this damage mechanism. The criteria and analytical methods presented in References 4 and 10 of the SER (i.e., Supplements 4 and 5 to XN-NF-82-06, Rev. 1) were found to be acceptable for evaluating rod internal pressures for PWR and BWR fuel designs, respectively. The remaining references in the SER (References 2-8) that discussed rod internal pressures were not found to be acceptable for this damage mechanism; however, many of these references did contain acceptable criteria and analytical approaches for other fuel damage mechanisms, i.e., for cladding corrosion, rod bowing, fretting wear, etc. Consequently, these references were used in the SER discussion of these damage mechanisms.
In order to clarify which references are acceptable for which damage mechanism, a t'able is attached that lists the damage mechanisms and their acceptable references.
If you have any questions on the above or tha attached table, please call Mr.
S. Wu at 301-492-7876.
Sincerely, Orisbal cipciby Charles E. Rossi, Assistant Director Division of PWR Licensing-A
Attachment:
DISTRIBUTION:
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9 Mr. G. N. Ward, Manager Reload Licensing Exxon Nuclear. Company, Inc.
2101 florn Rapids Road P. O. Box 130 Richland, WA 99352
Dear Mr. Ward:
During the review of ENC's extended burnup topical report XN-NF-82-06, Revision 1, several ENC letters and supplements were provided which contained additional information requested by the staff. These were referenced in the staff's safety evaluation report (C. E. Rossi letter to G. N. Ward, July 18, 1986). Not all of this information was used in our SER.
Per your request to Mr. R. Lobel of my staff, we are providing additional information regarding which sections of each supplement to XN-NF-82-06, Revision 1 are acceptable.
Due to different criteria and analyais methods for evaluating end-of,Mfe (E0L) rod internal pressures presented by ENC in several references, on 'two references were found to be acceptable for this damage mechanis The criteria and analytical methods presented in Reference 9 and 1 of the SER (i.e., Supplements 4 and 5 to XN-NF-82-06, Rev.1) were found' to be acceptable for evaluating rod internal pressures for PWR and BWR fueJ/' designs, respectively. The remaining references in the SER (Refprences 2-8) that discussed rod internal pressures were not found to be, acceptable for this damage mechanism; however, many of these references,did contain acceptable criteria and analytical approaches for other fueljfamage mechanisms, i.e., for cladding corrosion, rod bowing, fretting wear, e,tt.
Consequently, these references were used in the SER discussion of hese damage mechanisms.
In order to clarify which references are ac eptable for which damage mechanism, a table is attached that lists he damage mechanisms and their acceptable references.
If you have any questions on the abo 4 or the attached table, please call Mr.
S. Wu at 301-492-7876.
Sincerely, Charles E. Rossi, Assistant Director Division of PWR Licensing-A R-A h RSB PW -A R
P RSR PWR-A:AD SWu:s1 RLobel CBerlinger CERossi j
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List of Puel Damage Mechani ms and Approved References frcrn SER of XN-NF-82-06. Revision 1 roved References Fuel Damage Mechanims in SER FUEL SYSTEM DAMAGE (a) Design Stress 12 (b) Cladding Design Strain 2
(c) Strain Fatigue 2
(d) Fretting Wear 2,3,6 (e) Oxidation and Crud Buildup 3,6 (f) Rod Bowing 2,3,6,22 (g) Axial Growth 3
(h) Rod Internal Pressure 9,10 (i) Assembly Liftoff 2
(j) Control Material 2
NEL PCD FAIIURE (a) Hydriding 2
(b) Cladding Collapse 2,3,4,5 (c) Overheating of Cladding 2
(d) Overheating of Fuel Pellets 2
(e) Pellet / Cladding Interaction 2
(f) Cladding Rupture 2
(g) Fuel Rod Mechanical Fracturing 2,35 WEL QJOLABILITY (a) Fragmentation of Drbrittled Cladding 2,29,30 (b) Violent ExpJlsion of Fuel 2
(c) Cladding Ballooning 2,31 (d) Fuel Asserbly Structural Damage from External Forces 2,35 l