ML20112D164

Forwards Rev 1 to 841221 Application for Amend to Licenses DPR-42 & DPR-60,requiring That Fuel Being Stored in Small Pool Be Discharged from Reactor for Min of 5 Yrs,When Cask Inserted or Withdrawn from Pool

ML20112D164
Person / Time
Site:	Prairie Island
Issue date:	03/14/1985
From:	Musolf D NORTHERN STATES POWER CO.
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20112D173	List: ML20112D164 ML20112D178 ML20112D188
References
TAC-56614, TAC-56615, NUDOCS 8503220254
Download: ML20112D164 (3)

Text

, . - a Northem States Power Company s

V) 414 Nicollet Mall Minneapolis, Minnesota 55401 March 14, 1985 W ephone 612) 330-55 %

Director Office of Nuclear Reactor Regulation U S Nuclear Regulatory Commission Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 l 50-306 DPR-60 1

( Revision 1 to the License Amendment Request dated December 21, 1984, Removal of Restriction on Use of l 266 Existing Spent Fuel Storage Spaces

Reference:

(a) Letter from D M Musolf to the Director, Office of i

Nuclear Reactor Regulation dated December 21, 1984 entitled " License Amendment Request dated December l

21, 1984, Removal of restriction on Use of 266 Existing Spent Fuel Storage Spaces".

Attached are three originals and 37 conformed copies of Revision 1 to the hV request for a change of Technical Specifications, Appendix A, of the Operating Licenses DPR-42 and DPR-60 which was submitted under Reference (a). A check in the amount of $150.00 was submitted in accordance with 10 CFR Part 170 as the required application fee as part of Reference (a).

This revision will require fuel being stored in the small pool (Pool No.

1) to be discharged from the reactor a minimum of 5 yeare when the cask is being inserted or withdrawn form the pool. This change is being made in response to a suggestion from the State of Minnesota to maximize the decay time of the fuel discharged from reactor to lessen the fission gas release in the unlikely event of a cask drop onto the spent fuel and to minimize the fuel movements required when loading the cask.

Also included under this revis' ton is wording in the basis which details ~

tha need for the requirement to have no more than 45 recently discharged assemblies located in the small pool. This limit was established in the License Amendment issued on May 13, 1981 concerning the high density spent fuel rack modifications. This wording is being added so that the basis for each of the time limitations dealing with spent fuel discharged from the reactor to the small pool is understood for future reference.

Exhibit A contains Revision 1 of the Exhibit A contained in Reference (a).

Exhibit B contains Revision 1 of the Exhibit B contained in Reference (a).

Exhibit A and B of this letter should replace, in their entirety, Exhibit A and B of reference (a). Exhibit C of Reference (a) is not affected by O this change and is still applicable in its entirety.

o\o 8503220254 850314 PDR ADOCK 05000282 L

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V Dir, NRR March 14, 1985 Page 2 Northem States Power Company O The changes in Revision 1 are summarized below:

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Exhibit A

1) . On page 1 under " Fuel Handling Operations", proposed changes, line 13, change "... for at least 50 days" to "... for at least 5 years".

2) on page 2 under "Significant Hazards Evaluation", the second paragraph, item 2, line 2, change "... a minimum of 50 days to be stored in Pool No.

1, the radiation dose resulting from fission products release will not

-exceed 25% ..." to "a minimum of 5 years to be stored in Pool No. 1, the radiation dose resulting from fission products release will be minimized and not exceed 25% ...".

Exhibit B

1) On TS.3.8-2, Item B.I.d change "... for at least 50 days." to "... for at least 5 years".

2) On TS.3.8-4, under " Basis" the fifth paragraph, line 2, change "...

minimum.of 50 days. The 50 days will allow sufficient decay of the fission products such that their release would result in offsite doses less than 25% of the 10 CFR Part 100 guidelines. The cask ..." to "...

a minimum of 5 years. Supporting analysis indicated that fuel stored O. in the pool for a period as short as 50 days would allow sufficient decay of the fission products such that their release would result in off-site doses less than 25% of the 10 CFR Part 100 guidelines. The five year decay period was selected in following the general principle that spent fuel with the longest decay time would result in the least off-site doses in the event of an accident, while 7roviding the plant operational flexibility. The Cask ...".

3) On TS.3.8-5, under " Basis" after the first paragraph, insert a new paragraph, "The number of recently discharged assemblies in Pool No. I has been limited to 45 to provide assurance that in the event of loss of pool cooling capability, at least eight hours are available under worst case conditions to make repatra until the onset of boiling." -

4) On TS.5.6-2, under "C. Fuel Handling", the fourth paragraph, after l the words "... criticality considerations." in line 11, insert the sentence, "While 50 days was determined adequate, a minimum decay s

)

.Dir, NRR March 14, 1985 l Page 3 Northem States Power Company l period of 5 years has been incorporated into these technical specifi-cations to provide additional margin in meeting the criteria specified in NUREG-0612 for fission gas releases, while not restricting the --

plant's operational ficxibility."

Please contact us if you have any questions related to this request.

b ws David Musolf Manager-Nuclear Support ervices DMM/ TAP / dab c: Regional Administrator-III, NRC NRR Project Manager, NRC Resident Inspector, NRC G Charnoff MPCA Attn: J W Ferman Attachments O -

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