ML18052A803
| ML18052A803 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 12/05/1986 |
| From: | Thadani A Office of Nuclear Reactor Regulation |
| To: | Berry K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| REF-GTECI-A-49, REF-GTECI-RV, TASK-A-49, TASK-OR NUDOCS 8612100524 | |
| Download: ML18052A803 (3) | |
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Docket No. 50-255 Mr. Kenneth W. Berry Director, Nuclear Licensing Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201
Dear Mr. Berry:
December 5, 1986 1
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SUBJECT:
PALISADES PLANT - FRACTURE TOUGHNESS REQUIREMENT FOR PROTECTION AGAINST PRESSURIZED THERMAL SHOCK EVENTS, 10 CFR 50.61 By letters dated January 23 and August 7, 1986, Consumers Power Company submitted information on the material properties and the fast ne.utron fluence (E > 1.0 MeV) of the reactor pressure vessel in compliance with the requirements of 10 CFR 50.61.
We h~ve reviewed the pressure vessel material properties and the estimation of the fluence to the pressure vessel for 32 effective full power years of operation and the corresponding value of the RTPTS" The controlling material has been properly identified as one of the beltline plates.
Bounding values of.copper and nickel contents and the initial RTNDT.
were used, because the data are not complete.
Considering that the August 7 submittal represents a second effort to locate the supporting information.
and the remaining uncertaintie~ are minor, the justifi~ation given for the copper
The m~rgin has been derived from consideration of the bases for these values, following the PTS Rule, Section 50.61 of 10 CFR Part 50.
The inethodo logy for the fl uence ca lcul at ion was based on the discrete ordinates code DOT using 11Sailor 11 an ENDF-B/IV based cross section set.
The scattering i~ treated with~ P3 approximation,.plant specific sources were used and the code has been benchmarked by Westinghouse.
The peak fluence
- is the applicable value for the estimation of RT The comparison of the ca1cu1ated to survei11ance capsule measured eI~ues showed them to be conservative by up to 10%.
The methodology, the cross sections and the approximations used are acceptable.
However, the projected values ;for 32 effective full power years of operation assume the implementation of.low leakage loadings for Cycle 8 and subsequent cycles.
Consumers Power Company committed to a factor of 2 flux reduction to the pressure vessel for an eventual peak fluence of 4.lxl019 n/cm2.
Therefore, this approval is subject to fuel loading with such flux reductions.
Consumers Power Company committed to provide a report to the staff by September 30, 1987 de~cribing the engineering design and demonstrating the
- nux reduct-ion for Cycle 8 ahd future cycles:
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,- \\ -**--'Mr. Kenneth W. Berry
- The equation specified in 10 CFR 50.61, as applitable for the Palisades plant.is:
RTPTS
= I+M(-10+470xCu+350xCuxNi)xf0. 27 where:
Therefore:
I = Initial RTNDI M = Uncertainty ~argin Cu = w/ o Copper in 1 ower she 11 plate Ni = w/o Nickel in lower shell plate f = peak azimuthal fluence for 32 effective full power years 19 (E > 1.0 MeV) in units of 10
= -5°F
= 48°F
= 0.25
= 0.54 n/cm = 4.10 RTPTS = -5+48+(-10+470x0.25+350x0.25x0.54)x4.l0. 27
= 43+154.8xl.464 = 269.5°F which is lower than 270°F, the applicable 10 CFR 50.61 screening criteria and is acceptable.
In view of:
- (a) The Pressure-Temperature updating requirements for the fracture toughness of the beltine material in 10 CFR Part 50 Appendix G, and (b) the fact that the RTPTS value is readily available from the calculation of the Pressure Temperature limits,, and (c) the ~taff desire to be informed on the cur.rent value of the RTPTS for all PWRs~
we request that Consumers Power Company submit a re-evaluation of the RT and a comparison to the prediction along with the future Pressure-Temper~l~re operating limits which are required by 10 CFR Part 50, Appendix G.
It should be noted that this reevaluation is a requirement by 10 CFR 50.61, whenever core loadings, surveillance measurements, or other information indicate a significant change in projected values.
In addition, we accept your commitment to provide by September 30, 1987 the fluence reduction report.
This request for information was approved by OMB under clearance number 3150-0011 which expires December 30, 1986.
Comments on burden and duplication may be directed to the Office of Management and Budget, Reports Management, Room 3208, New Executive Office Building, Washington, D.C.
20503.
cc:
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PBD#8;/ '1f W TWambk'ch ;cf 12/8/86 Sincer:ely,_
/sf Ashok C. Thadani, Director PWR Project Directorate #8 Division of PWR Licensing-8 If(
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Mr. Kenneth W. Berry Consumers Power Company cc:
M. I. Miller, Esquire Isham, Lincoln & Beale 51st Floor Three First National Plaza Chicago, Illinois 60602 Mr. Thomas A. McNish, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Jerry Sarno Township Supervisor Covert Township 36197 M-140 Highway Covert, Michigan 49043 Office of the Governor Room 1 - Capitol Building*
Lansing, Michigan 48913 Palisades Plant ATTN:
Mr. Joseph F. Firlit Plant General M~nager 27780 Blue *Star Memorial Hwy.
Covert, Michi~an 4~043 Resident Inspecto~
c/o U.S. NRC Palisades Plant
. 27782 Biue Star Memorial Hwy.
Covert, Michigan 49043 Palisades Plant Nuclear Facilities and Environmental Monitoring Section Office Division of Radiological Health P.O. Box 30035 Lansing, Michigan 48909