ML20024G207
| ML20024G207 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 09/30/1977 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | Stello V Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20024G208 | List: |
| References | |
| NUDOCS 9102080328 | |
| Download: ML20024G207 (3) | |
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NORTHERN STATES POWER C0MPANY MIN N E MQt 8 8. MIN N E SOM 8 8401
-6 September 30, 1977 g M Ik!)JQ
( nr t Mr Victor Stello, Director g
Division of Operating Reactors CCf3 b77A.
c/o Distribution Services Branch, DDC, ADM 9
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U S Nuclear Regulatory Commission J
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Washington, DC 20555
Dear Mr Stello:
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MONTICELLO NUCLEAR GENERATING PIAN""
Docket No. 50-263 License No. DPR-22 License Amendment Request Dated September 30, 1977 Attached are three originals and 37 conformed copies of a request for a change to the Provisional Operating License and Appendix A Technical Specifications for the Monticello Nuclear Generating Plant. This change incorporates the September 15, 1977 ECCS re-analysis submitted to you pursuant to the March 11, 1977 NRC Order.
The proposed revised limits affect the fuel types that have been used at Monticello in the past and will continue to b: used in the future. The proposed limits are in general less restrictive than the existing technical specification limits. There are two cases discussed below, however, where the newly calcula-ted limits are slightly more ' restrictive than those in the technical specifications.
As has been the practice in similar situations in the past, we are administrative 1y adherhg to the most restrictive of the existing and proposed technical specifi-cation limits. We request that the amendment be reviewed and approved expeditiously tc resolve this situa tion.
One point where the proposed limits become more restrictive is between 25,000 and 30,000 mwd /t for the 8D219 fuel. The MAPLEGR limit at 30,000 mwd /t is reduced from 10.5 to 10.2 kv/ft. The MAPLHGR c'trve presented is a composite of both the planar average LHGR (based on the 2200 F PCT limit of Appendix K) and the local LHGR (limited by 13.4 kw/f t).
A re-calculation of local peaking factors for the 8D219 fuel results in LHGR limitations at a lower power than PCT limi-tations. The subject is quite academic, however, since fuel at that high an exposure is not reactive enough to approach either limit. None of the 8D219 fuel at Monticello has reached the exposure level where the limit change occurs.
l Smaller restrictions were added to the 8D250 and 8D262 fuel types because of PCT limitations. The most noticeable of these is at 15,000 mwd /t for 8D250 fuel where the MAPLHGR limit. drops from 10.8 to 10.7 kv/ft. The change in the last significant figure is 1.ess than one percent, which is approximately the 20 F 9102000328 770930 g[O FDR ADUCK 0500 3
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NORTHh GTATE'3 POWER COM Y
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Mr Victor Stello
.y Page 2 September 30, 1977 i
'I PCT difference threshold which 10 CFR 50 Appendix K defines as a significant change, below which documentation is not necessary.
f Please note that a typing error has been corrected from the September 15, 1977
{I report. The lowest exposure at which the BD250 MAPLHGR is evaluated is 200 mwd /t i
4 (as shown on Page 189K of attached Exhibit C) rather than 300 (as stated on
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Page 4-8 of the report suhciitted on September 15, 1977).
4-Yours very truly, f
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L 0 Mayer, PE Manager of Nuclear Support Services LOM/MHV/deh i
cc: J G Kep'pler G Charnoff MPCA Attn: J W Ferman MECCA Attn: R J Hatling S J Cadler Attachments l
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