ML20058K757
| ML20058K757 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 11/05/1973 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 9102140360 | |
| Download: ML20058K757 (1) | |
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NSF NORTHERN STATES POWER COMPANY MIN N E A PO LI S, MIN N E SOTA 55409 Ragulatory File Cy.
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November 5,1973
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Mr. D J Skovholt b
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Washington, D C 20545
Dear Mr. Skovholt:
MOSTICELLO NUCLEAR GENERATING PlAIU Docket No. 50-263 License No. DPR-22 Additional Calculations of the Fuel Densification Gamma Curve Your October 26, 1973 letter requested that we provide calculations beyond 15,000 5'D/T exposure for Figures 4-9C1 and 4-9C2 of General Electric Topical Report NEDM-10735, supplemento 6, 7, and 8.
Calculations were initially done for segment exposures of 15,000 m'D/T and extrapolated to higher exposures. Canfirmatory calculations were recently done for segment exposures of 25,000 m'D/T. The MAPLHGR for gamma curve conditions of initial core fuel is calculated at,25,000 E'D/T segment expo-sure to be 11.5 kw/ft as shown in Figure 4-9C2.
For the 20 Monticello Generic B Reload I assemblies considered in Figure 4-9C1, the MAPLHGR gamma curve decreased from 11.5 kw/f t at 15,000 MWD /T to 11.4 kv/f t at 25,000 MWD /T segment exposure.
'Ihere is no change in either curve in question prior to 15,000 MWD /T.
We do not expect any fuel segment to reach that exposure during cycle 2 which terminates in the spring of 1974. The Reload 1 fuel will have significantly less exposure in the peak segment at that time.
We understand that General Electric has transmitted answers on this subject along with replacement figures in a November 2,1973, letter from Mr. IF Stuart to Mr. V A Moore.
Please reference this information in our docket.
Yours very truly, 6.
L 0 Mayer, PE Director of Nuclear Support Services 9102140360 731105 8083 cc: J G Keppler CF ADDCK 05000263 G Charnoff CF Minnesota Pollution Control Agency Attn. K Dzugan