ML20141J504
| ML20141J504 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Prairie Island |
| Issue date: | 03/12/1968 |
| From: | Zabel C Advisory Committee on Reactor Safeguards |
| To: | Seaborg G US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML17342B389 | List: |
| References | |
| FOIA-85-665 NUDOCS 8602270005 | |
| Download: ML20141J504 (3) | |
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k ADVISORY COMMITTEE ON REACTOR SAFEGUARDS y:
UNITED STATES ATOMIC ENERGY COMMISSION
,f-WASHINGTON, D.C. 20545 MAR 121968 m
' Honorable Glenn-T. Seaborg Chairman r
U. S. Atomic Energy Commission.
'I Washington, D. C.
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- 7 REPORT ON PRAIRIE ISLAND NUCLEAR GENERATING PIANT[l f
Subject:
UNITS 1 AND 2 s
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Dear Dr. Seaborg:
ll 7-9, 1968, the Advisory Committee
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At its ninety-fifth meeting, on Marchon Reactor Safeguards comp
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Northern States Power Company for authorization to construct nucicar l(
generating plants Units 1 and 2 at its Prairie Island site, in G f
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l County, Minnesota.
27, 1967 and in Washington, committee meetings at the site on OctoberDuring its review,.the Committee ha l
D. C. on March 1, 1968.
fit of discussions with representativos of the Northern -States Power.
j Company and their consultants, the Westinghouse Elcetric Corporation, l.
The Committee also and the AEC Regulatory Staff and their consultants.
had the benefit of the documents listed.
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The Prairie Island site comprises approximately 560 acres located six miles northwest of the city of Red Wing, Minnesota, on the Mississippi g
d Wing has a population of 10,500 while the Twin Citics metro-i politan area, 28 miles northwest of the site, has a populatio River..Re
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1,700,000.
i The soils _at the site consist of sandy alluvium, ranging in thicknessSe from approximately 160 to 185 ieet.The soil will be dewatered, excavated, stone bedrock underlie the site.
v classified and replaced to a depth of approximately 30 feet and compacted to a relative density of 857..
r The Prairie Island units are to be identical, two-loop, pressurized water With respect to reactors operated at maximum power levels of 1650 MWt.
core design and other features of the nuclear steam supply system, the The units units are essentially duplicate.s of the Point Beach reactor.
- have a power level and average heat flux about 187, higher than the Point Beach rea'ctor with a power density nearly that of the Diablo Canyon reactor.
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t Each reactor and its steam generators are enclosed in a structure which cons.ists of a steci primary containment shell and a reinforced concrete vertical shield cylinder with a shallow dome. The applicant stated that the vacuum relief valves for the containment will be sized to accommodate simultaneous operation of the two spray subsystems and the four finned coolers.
The applicant has stated that protection will be afforded against the maximum probabic flood.
Ihe applicant has proposed using sign.als from protection instruments for control purposes. The Committee continues to believe that control and protection instrumentation should be separated to the fullest extent practicable. The Committee believes that the proposed protection system i
can and should be modified to eliminate or reduce to a minimum the inter-connection of control ' nd protection instrumentation. The modified system a
should be reviewed by the AEC Regulatory Staff.
The Committee continues to call attention to matters that warrant careful consideration with regard to recent reactors of high power density and i
other matters of significance for all large water-cooled power reactors.
These matters, stated in our report to you of December 20, 1967 on Diablo Canyon, apply similarly to Prairie Island Units 1 and 2.
The Committee believes that, if due consideration is given to the foregoing items, and in view of the favorable site location, the nuclear units pro-posed for the Prairie Island site can be constructed with reasonable assur-
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ance that they can be operated without undue risk to the health and safety of the public.
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Sincerely yours, i-fA k Carroll W.
d :1 Chairman References Attached.
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References - Prairie Island 1.
Volumes 1, 2, and 3 - Prairic' Island Nuclear Generating Plant, Facility
. Description and Safety Analysis Report, received September 1,1967.
2.
Supplement No. I to Application for Licenses, Prairie Island Nucicar
- Generating Plant, Facility Description and Safety Analysis Report, received September 1, 1967.
3.
Northern States Power Company letter, dated August 24, 1967, transmitting
' Amendment No. I to the Construction Permit and Operating License Applica-tion.
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4.
Northern States Power company Ictter, dated December 15, 1967, transmitting Amendment No. 2 to the Construction Permit and Operating License Applica-tion.
5.. Volume 4, Prairie Island Nuclear Cencrating Plant, Facility Descriptica and Safety Analysis Report, Appendices J, K and L, received December 28, 1967.
6.
Northern States Power Company letter, dated January 12, 1968, transmitting Amendment No. 3 to the Construction Permit and Operating License Applica-tion.
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7.
Northern States Power Company letter, dated February 15, 1968, transmitting Amendment No. 4,to the Construction Permit and Operating License Applica-tion.
8.
Northern States Power Company letter, dated February 27, 1968, transmitting Amendment No. S to tha Construction Permit and Operating License Applica-l tion.
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9.
Northern States Power Company letter, dated March 6',
1968, transmitting
. Amendment No. 6 to the Construction Permit and Operating License Applica-tion.
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