ML20024G434

Application for Amend to License DPR-22,increasing Allowed U-235 Inventory to 3200 Kg

ML20024G434
Person / Time
Site:	Monticello
Issue date:	05/30/1975
From:	Wachter L NORTHERN STATES POWER CO.
To:
Shared Package
ML20024G433	List: ML20024G432 ML20024G434
References
A00L-750530, AL-750530, NUDOCS 9102120445
Download: ML20024G434 (4)

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UNITED STATES NUCLEAR REGUIXIVRY C01h1SSION NORulERN STATES POWER CGIPANY Docket No. 50-263 REQUEST POR AMENIEEST TO OTERATING LICENSE NO. DPR. 22 (License Amendment Request Dated May 30, 1975)

Norchern States Power Company, a Minnesota corporation, requests authorization for an amendment to the Operating License as shown on the attachment labeled Exhibit A. Exhibit A describes the proposed amendment along with the reason for the amendment.

This request contains no restricted or other defense information.

NORDIERN STATES POWER CCNPANY by 'c 0$YA h 4 J Wachter Vice President, Power Production

& System Operation On this 30th day of May , lo7s , before ne a notary public in and for said County, personally appeared L J Wachter Vice President, Power Production and System Operation, and being first duly sworn acknowledged that he is authorised to execute this document in behalf of Northern States Power Company, that he knows the contents thereof and that to the best of his knowledge, information and belief, the statements made in it are true and that it is not interposed for delay.

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I Exhibit A Monticello Nuclear Generating Plant Docket No. 50-263 License No. DPR-22 License Amendment Request tuted May 30, 1975 Pursuant to 10 CFR 50.90, the holder of Provisional Operation License DPR-22 requests that Section 2.B of this license be amended to read as follows:

"L. Pursuant to the Act and 10 CFR Part 70, "Special Nuclear Material," to receive, possess, and use at any one time up to 3200 kilograms of uranium 235 as reactor fuel assemblies, 50 grams of uranium 235 as fission chambers, and 16 grams of pluton-ium as contained Pu-Be neutron sorces in connection with operation of the facility."

The Monticello License presently allows the receipt, possessien and use of up to 2300 kilograms of uranium 235 as reactor fuel assemblics. The only change is that the proposed wording increases that limit to 3200 kilograms.

A change in the Monticello fuel management scheme is planned to reduce gaseous radioactive ef fluents from the plant. This change a f fects the basis of the present limit on uranium 235 as reactor fuel assemblies.

The initial fuel management scheme called for the replacement of highly exposed fuel by periodic reloads. At no tbme was the inventory of uranium expected to exceed that of the unexposed initial core. The license limit was thereby established at 2300 kg of uranium 235. Ob-served increases of effluent levels have been attributed to cladding perforations in the initial core fuel. In October of this year we are planning to replace all remaining initial core fuel with fuel designed and constructed similar to that which has demonstrated improved performance at Mont'. cello and elsewhere. The premature discharge involves an un-anticipa*ed residual inventory of un-fissioned uranium 235 in the dis-charged feal. The increase in the proposed limit of uranium 235 as fuel assemblies represents the impact of this residual inventory as well as " large reload batch required to replace it.

The proposed change in the allowable amount of uranium 235 as reactor fuel assemblies does not alter previous safety evaluations or raise r.ew saf ety concerns. Of interest here, is the amount of uranium 235 that can be accomodated at the Monticello facility in a criticality-safe manner. Tuel storage racks in the new fuel storage vault are designed such that an infinite array of stored fuel vill have a multiplication factor less than 0.90 dry and less than 0.95 flooded. Puel storage racks in the l

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spent fuel storage pool are designed such that an infinite array of stored fuel at its most reactive exposure will have a multiplication factor less than 0.90 dry or flooded. This criteria is met for all fuel types presently in use and is verified each time fuel of another type and/or enrichment is introduced into the facility. The amount of uranium 235 requested in the i proposed amenanent is substantially less than that amount allowed by this I I

criteria.

1he proposed license change, in no vay, involves a change in the technical specifications.

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FROM: Northern States Pvr. DATE OF DOC D ATE R E C'D LTR 'l WX RPT OTHER Minneapolis, Mn. 55401 L 0 Mayer 5-30,15 6-P "3 XXX TXXX TO:

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CLASS l UNCLASS PROPIIJFO INPUT f!O CYS PLC'D DOCKET ND:

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DESCHIPTID:;; ENCLOSURLS:

Ltr trans the following: Encl. notatrized 5-30-75, Requent for Amdt. to operating Liecnco No.

DPR-P2Nech Spee. , the requested /dt. vo"ld i inercru.e tne allowed urtniun 235 inventory 1Kvg. ' Top.u vs}yJ}]')'

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