ML20086T270
| ML20086T270 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/20/1991 |
| From: | Hutchinson J, Hutchison J C-E OPERATING PLANTS OWNERS GROUP |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20086T268 | List: |
| References | |
| CEOG-91-741, IEB-88-011, IEB-88-11, NUDOCS 9201060196 | |
| Download: ML20086T270 (2) | |
Text
- Ic m acaa wta corvotecr5 cgryte wrw'yr we q
l-l t L
COMBUSTION ENGINEERING OWNERS GROUP 5-a c~.
, c.7 u
. 4F.~.Ta G c-
..m
- $ c h =
- <=a[h)*h a
'*-* = $ h a* "
P c*
=a s
l John J. liutchinson, Chainnan c/o Florida Power & Lightn00 Universe Boulevard / Juno Beach, FL 33408 December 20, 1991 CEOG-91-741 Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.c.
20555 8UBJECT Combustion Engineering owners Group Response to NRC Bulletin 88-11 HPressuriser Surge Line Flow Stratification,se CEN-387-P, Rev. 1-P
Enclosures:
CEN-387-P, Rev. 1-P, copies 001 through 023 CEN-387-Np, Rev. 1-Np, ten copies Gentlemen:
In response to NRC Bulletin _88-11, the Combustion Engineering owners Group (CEOG) initiated a program to address the issue of surge line thermal stratification including thermal striping.
The results of this program demonstrate that the structural integrity of all CEOG plant's surge lines are maintained for the forty. rear design life of these piping systems.
The enclosed report, CEN-307-P, Rev.
1-P, provides a description of the analytical approaches used and a summary of'the results.
The CEOG understands that review of the attached report is not subject to any review fee? - If this is_not the case, please contact myself prior to commencing any review.
The CEOG program consisted of collecting and reducing data (outside pipe wall temperatures and displacements), developing thermal hydraulic models, developing new generic-thermal load definitions, performing a stress and fatigue analysis and detcrmining the fatigue life of the surge line.
Conservative gS thermal hydraulic assumptions were used for the thermal. striping, U$
stress and. fatigue evaluations in-a manner that was consistent 28 with the test data.
,w All of the sttrge lines exceeded the 3Sm elastic stress limit of ASME Code Section III Equations 10 or 12 and, therefore,.an y!,
elastic-plastic analysis was performed.
This analysis ad demonstrated that the surge-lines do shakedown _and that S
progressive distortion does not exist.
The results_of this y
analysis were used to calculate the fatigue life of the surge sao line.. The resultant usage factor-for all CEOG surge lines including the noz::les is less than one, hence a 40 year fatigue life of all CEOG surge lines is demonstrated.
All_ pressurizer l
and piping surge. nozzle loadings are also acceptable.
L
1 e
2032954044 PL44T COf1POEtiT5 061 P03 IEC 20 '91 15:42 E
The onclosed report contains information proprietary to combustion Engincoring, Inc. and is supported by an affidavit signed by combustion Engineering.
Accordingly, that the information which in proprietary to Combustionit is requested Engineering be withheld from public disclosure in accordance with 10 CFR Section 2.790 CEN-387-NP, Rev. 1 are also provided. Ten copies of the non-proprietary version, g
&i If there are any questions or comments, please do not hesitate to contact me.
Sinceroly, g
WW
- ~
ohn J. Hutchinson Chairman, C-E Ownern Group C-E Owners Group xc3 Mr. James Pfeifer.
C-E Mr. Terrence Chan, USNRC i
l 6