ML20125A571
| ML20125A571 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 06/16/1970 |
| From: | Price H US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Bauser E CONGRESS, JOINT COMMITTEE ON ATOMIC ENERGY |
| References | |
| NUDOCS 9212080398 | |
| Download: ML20125A571 (1) | |
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ye Mr.'Rdward J. Bauser-Executive Director
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Joint Committee on Atomic Energy
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Dear Mr. Bauser:
A report of the Advisory Committee on Reactor Safeguards, dated June 15, 1970, concerning the Monticello Nuclear Generating Plant, Unit 1, is enclosed for the information of the Joint Committee.
Sincerely,
.l dW kold L. Price Director of Regulation
Enclosure:
As stated bec:
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.d ADVISORY COMMITTEE ON REACTOR SAFEGUARDS UNITED STATES ATOMIC ENERGY COMMISSION WASHINGTON,0.C. 20545 June 15,1970 hennroble Citnn T. Senhorg Choirean
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20545 Subjec t : T.!UO:(T Oil IMTIICELLO ITJCUAP. GEUETATII:G PIMIT UliIT 1
Dear Dr. Seaborg:
At its 121st rectirc, May 7-9,1970, and (to 127nd raceting, June 11-13, 1SiO, the Adeirory Cox7!ttcc on Recctor Snfcguarda met with !!orthctn Statec Tower CL;isny to rcview proposcJ chno3cs to the rcactor vercel nor.:.le "t,fe 'enW (ntainicos eteci entensions of the nornles) of the Ib:.ticello 1;oc10 r Ccarratin; Plant Unit 1.
During its revie.1 of the chany r, the Comittee hid the benefit of discussion: uith the appli-the Concral I:1cetric Ccapany, the ATC Regulatory Sta ff, cad titcir
- cent, concoltants.
The Ccnittec nico had the bcuefit of the do:amcats lintcJ.
The Comittco rcportc3 to yau on oport: tion of the Ibaticello Flant on January 10, 1970.
1: orc,1 proccJurco for nost reactor pressure venscic have been to join the oustcaitic ctninleca steel cnic ends to the no:: les prior to the ctrera relievina heat trecta:nt.
This heat treat,cnt r.ensitires the c dc ends, uhich c:hes the ttect ices resistent to certcin types of carrosion.
Senniti cd auctcaitic ctetnicas steelt, in this condition have given reasonably saticfcetory service over many reactor ycars of operation.
Recently, lecho developed in cencitized cafe en.!c of tuo operating renetors.
The cauces of the leahs have been ntudied exhaustively, cnd it is concluded by the liccnocen that they ucre enused by unusual circumstances that need not have existed.
In view of thin experience, however, !;orthern Stntco Pouer Company is cahin', nodifications to Uait 1.
In the 1:onticello veccol, cicht enfo endo ucrc censitired.
The modificc-tio:.c coacitt of repinin; six censiticed rafo ends with unceacitired matcrici cnd overleying the other two with wcld metal cladding of a com. position that is resistant sc strcen corrosion. So :e other compon-ents cud ctroch.cnts in the vescol cro also being overicid or replaced.
The Co mittee.c;rc a uith the cpplicent that these chan3cs, properly enceuted, should ira recre asruronec of troubic-free operation. The Cormittco viches to cr.11 ottention to other fcetors that would furthcr
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lion. Glenn T. Scebers June 15,1970 j
W tend to dirainish the probability of a failure in a ssfo end or other i
piping cc::ponent. The Co::aittco believen en independent check chould i
i be tude of stresscc in the os-tuilt_ piping of the priciary systen,' end-l thct displecc= ente chould be obcerved in the hot condition. A revica should be c:de of hich points in non-flowing pc:ts of the cyotem and j
tacano chould bo provided, uhore neccosary, to vcat or otherwiso re-novo cecca that could becomo trcpped at such pointo.
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J The Co:mittee airo beltcves that the Regulatory Staff chould assuro itccif that the biologien1 rhield currounding the reactor vescci can-i uithstand the pressuro that could be developed by loca of integrity of i
o caro end or notele, or that failure of the shield would-have no
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intolerahlo concoquences.
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The Coraittee has en ccverni occasions strccced the importance of in-cervice incroction and Icak detection.
It recorncuds that the Mc;ula-tory Staff develop a schedulo of incpections for safe endo.. - The operr. tion of the leck detcetion cad location cyctcms should be reviewed end todifica es cppropristo to obtrin the moxina.n speed and renaltivity for detection of leaks..In.cddition, the opplicant should ctudy other j
techniques of detecting lcnha.
Subject to thoco ccm:nents, and if duo ottention 10 paid to the items j
discucced in the Committee report of January 10, 1970, the Conaitteo j
reaffirms its belief that thoro ic roeconabic onsurcace that the l
Monticello !!ucicar Gcncratins plant Uait 1 can bo operetc3 at power Icycla up to 1670 C(t) uithout unduc risk to. the health and safety
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of the public.
Mr. Hill did not participate in~the revica of this proje,ct.
4 Sincerely.yours, Loriginni Signed SY Joseph L Hendrio Joseph 11. llendrio
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Chairman-e
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P.cfortm e en :-
Amendaent'26 to the License Application, deced.5/7/70 -- Proposed 9'.
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codifientionc to. the furnace r.cnsiti;:cd etainlesc stent componcuts ettcched; to the.renctor prescuro vecoci.
2.
Amen &acnt 27 to the Licenso Application, dated 5/19/70 y--
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