ML20058K705

Forwards Errata Sheets for Monticello & Prairie Island Statements.W/O Errata Sheet for Prairie Island

ML20058K705
Person / Time
Site:	Monticello, Prairie Island
Issue date:	01/29/1971
From:	Dienhart A NORTHERN STATES POWER CO.
To:	Muntzing L US ATOMIC ENERGY COMMISSION (AEC)
References
4778, NUDOCS 9102130518
Download: ML20058K705 (3)

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Sd-806 NORTHERN 5TATES POWER COMPANY M IN N E A PO LI S. Pil N N E S OTA 5 540%

N0gU!Ii"7 fije Cy, October 29, 1971 ff

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Mr L Manning Muntzing g,

Director of Regulation

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N U S Atomic Energy Comission Washington, DC 20545

Dear Mr Munt:

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MONTICELLO NUCLEAR ENERATING PIANT E-5979 l

Operating License DPR-22 PRAIRIE ISLAND NUCLEAR ENERATING PLAIC E-6197 Construction Permits CPPR-45 and CPPR-46 Dar letters of October 15 for the above projects furnished information pursuant to Section E.3 of Appendix D to 10 CFR Part 50.

Inadveri,ently ve failed to have these two letters notarized. We therefore are enclosing substitute letters that have been appropriately notarized.

Unfortunately, several minor typographical errors occurred in the Prairie Island Nuclear Generating Plant " statement" and to correct for this we are enclosing 50 copies of an Errata sheet.

We are also furnishing an errata sheet, in 50 copies, for the Monticello " statement" which includes supplemental infornation requested by your Mr Victor Benaroya.

Yours very truly, b*

A V Dienhart

1. F Vice President - Engineering e\\/P NY "j,g* e h; '

N Subscribed and sworn to before ne S

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A LNotary Publici Hennepin County, Minnesota My Corrission Expires March 3, 1976 O(.b Notarial Seal 9102130518 710129 CF ADOCK 05000263 CF i

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Reference:

DPR-22

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re ERRATA POR A

A M3NTICELIO NUCLEAR ENERATING PLANT g

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STATDENT k s.,

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C ENERGY COMMISSION Page 3, Line 12 - following word " reactor" change "of" to "at" Page 3, Line 13 - following word "in" delete "the" Page 5, Line 14 - change " vise" to " wide" Page 9, substitute replacement Page 9 and add Page 9a (dated 10/29/71)

Page 15, Line 7 - change "is" to "it" l

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2.

Operatinc Ernerience For the operating period ending June 30, 1971 the radioactive releases from the plant were a snall fraction of 1% of the Technical Specifications-allowed During the period liquid releases amounted to 4.5 x 10-6 percent.

releases.

-3 Related gaseous releases were 28 x 10 percent for noble gases and 12 x 10~

percent for iodines and particulates. Soli' wastes generated during the period had a total activity of 7.6 curies and all of this material was shipped off-site to an AEC approved disposal facility. Further data can be found in the Six-Month Operating Report No. 1 submitted to the AEC Division of heactor Licensing on August 30, 1971.

On July 11., 1971 a series of events occurred, initiated by an equipment cal-function, that resulted in an unexpected gaseous release at a rate of about 35,000 micro curies per second (pci/sec) through the nain stack and about 20,000 pei/see through the reactor building vent, which persisted for a period of about 30 minutes. This release was well within the Technical Specification limit and vus promptly reported to AEC.

Subsequent analysis of this release has shown the maxima integrated off-site dose to be about 0.033 millire: at the cite boundary. Such a dose is insignificant ;ompared to a natural background 4

radiation of about 120 tillires per year in the Monticello area.

With the plant now operating for longer periods of time near maxi =u

load, the amount of radioactivity released has increased slightly bat still is less f

than a few percent of the Technical Specification linits. During the reviev 1

period it is expected that the radvaste releases vill be less than 5% of the l

Technical Specification limits.

l The nearest public water supply using Fississippi River water is the i

Minneapolis-St Paul syster about 35 niles downstream from the plant. As a l

result, liquid releases beforc discharge to the river cust confort to the f,

4 Technical Specification linits on en instantaneous batch-by-batch basis without

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