ML19319B112

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Technical Assistance Request ORB-2-383 Re Investigation of Potential Lamellar Tearing & Low Fracture Toughness of PWR Steam Generator & Reactor Coolant Pump Supports
ML19319B112
Person / Time
Site: Beaver Valley, Millstone, Calvert Cliffs, Davis Besse, Salem, Oconee, Palisades, Indian Point, Kewaunee, Saint Lucie, Point Beach, Arkansas Nuclear, Prairie Island, Surry, Turkey Point, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Robinson, San Onofre, Cook, Yankee Rowe, Maine Yankee, Rancho Seco, Zion, Fort Calhoun, Trojan, Crane
Issue date: 07/07/1977
From: Eisenhut D, Snaider R
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
References
TASK-03-09, TASK-05-08, TASK-3-9, TASK-5-8, TASK-RR 770701, ORB-2-383, NUDOCS 8001070773
Download: ML19319B112 (9)
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g s_ - q 3,+ . -,7_ wy t..u a .h. y i < gy m [ p; X q. p q E-x PTAC/080gl 20im-2-3S3; EAJ/Ar Cont'd: 1During the course of the licensing action for-!! orth Anna Power Station Unitl!!os.- 10cnd 2,Ca' nu:ior of questions were raised as to the potential for,lamellar. tearing and low fracture tcuphness of the.stccm cencrator - and reactor coolout peap support materials for those units. -Two 1different steel specificationsL(ASTM A36-70s and ASTM AS72-70a) covered -most'of tha1 material used;for these supports. Toughness tests, not

origilially spbcified and not inlthe relevant ASTM specifications, were made on those heats for which excess natorial uas available.

The toughness;o_f the A33 steal was found to be adequate, but the toughness _4 .~of the A572 steel uas relatively poor at an operating temperature of g EC0 F. In-thescase of i: orth Anna Unit i:os.1 and 2 the applicant ins ~ agreed to raise theitemperature of the AST:' A572 imams in the steta generator; supports to a mininum tenperature of.225"F crior to pressurization toLlevels ebove'1000psig. Tw iliaiy.clectrical-htet ,p j. uill be caployed to supplcmnt the heat derived frca the reactor ccolant j~ cloop as necessaryy to obtain the rcquired operating temperature nf the p structurcs.- dk ?Accordingly, the iallouing tashs for DOR /ED have been subnitted as j-part 'of. the !!pa Category A Tcsk Action Plan on this subject: p. 1.= Send cencric letter to cll.PPR licensees stating our concerns J and:ren,uesting inforr.ction on the desiqn, notoriels, fabrication and inspection of the' steam pencrator and reactor ecolant ps:p 1; supportsAfor.each plant. 4 -2.. Obtcin a-consultcnt to provide er.pertise in evalontino the potential ei for lamellar: tearing and lue fracture tone: mess of the support ..r.hterials. >It is the intent that.the consultant uill assist in

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{ the revieufuork ~aini perfora a literature secrch for fracture h .tcughness data on the caterials in question. a. 3. !!cshd onlinforetien supplied by the licensces. cotocori7e the i 1 support dasipn rnd mtericls as f ar as ornctical and select tynical ~~dasinns for further study. 4-4. Co plete preliitint'ry revicw of typical: designs and inforn each - applicablo:Pim licensee of.the cencarns on t'icir particular support-system-there.;au probica exists. thel licensee should ! e required to i provido additional infonhation to deconstrate that the safety cargins-4 1' '!d lforJ their supports.are not. lower than anticipated. - If this cannett .beid')ne, the licensee should propose afsoluticn to the problen.: For- ~ J (thosellcuts identified asinot.having aLproblen.g a Safety Evaluation f, 'should -be-conple ted; s a r -h 3 4 1 L " + y '? L r

d[f N f . TAC 6M?- .i O! We 303 1 M/AK Cont'd: / 9, s l 5. Dased on additional infomation provided by the licensee, couplete evaluation of fracture toughness of steam generator and reactor coolant pump support materials for each picnt havinq patcntial problem (s) as identified under Iten 4. 6. If the final evalcation based on the edditional intomation or proposed solution provided by tie licensee identifies cd.iitional concerns, a specific action plan for the plant (s) in question will be developed. DSS / lieu and' DSS /P.TEB should folic. the activitics of the task orcanization and determine -if action on CP/0L reviews will be necessary. Substantial interaction with cutside organizations (licensecs and j successful bidder per subparagraph P.. above) is c::per.ted. ] l DISTRIBUTION bekts 50-213/244/305/@z82/306/335/346/275/285/336/266/ 270/287/255/206/344/029/2:5/304/313/368/317/3:d/315/ o ORB //2 iteading 50-316/ I RMDiggs 50-247/286/309/312/261/280/281/289/320 i RPSnaider MConner MFletcher L01shan i EReeves MFai rtile MGrotenhuis .GZwetzig BRussell TWambach DNeighbors GZech j FBurger CTrammell 3 Wagner. i SNowicki i -DE11iott DJaffe [ I DVerrelli-JSiegel .C4elson. PErick jf I 0 Drib 5B $2 '_ $0IQ6},P#2 ,,m,.. t._..- m 7.. _ sae ss a me t 9 - j *,- 7/ /p7 7/.f/77 ~., .._,m....,_._ m.._....,.._.._............. L'. j}}

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