ML19256D195
| ML19256D195 | |
| Person / Time | |
|---|---|
| Site: | Crystal River, 05000303, Crane  |
| Issue date: | 10/17/1967 |
| From: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Boyd R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7910170693 | |
| Download: ML19256D195 (2) | |
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- G 7 Roger S. Boyd, Assis* mt Director for Raaetor Projects, Division of Eaaetor Licensing THEU: Saul Levine, Assistant Director for Reactor Technology
- 1. C. DaToung, Chief Containment & t'a=panent Technology Branch, DRL CILBERT AS50r'T Am, INC., DESIGN OF CONTAINMENT YESSELS TOR THE THREE MILE ISLAND AND CETSTAL RIVER UNITS USING GROUIED PRESTRESSED TENDONS C&CZ3: DEL:1CDeY IT-189 P00RORGNAL The Ctystal River Enit is included in this mano because this applicant (Florida Feuer Corporation) expressed a desire to pattern their application en the review of Metropolitan Edison's Three Mile Isisad Unit. However, thls may not be possible wtten eensidering the esatsin= ant vessel because ground water at the Crystal River sits is =1ine as compared to fresh vatar at the Three Mile Islartd sita.
Based om as tattial review of the information provided by the applicant, Mr. N. Davison does not believe sufficient evidence has been presented to justify the ese of concrete grouting to provida cerrosion protection for their prest:eesing tendens. The ability of the grout to prevent corrosion is sempletely dependent en the quality of the installed grosting, which is He very difficalt to accomplish in curved tandan prestressing systems.
kasus of as needestructive test te verify the quality of installed grout.
At present, there is no vessel of this size and duty cycle which has installad greeted t==Aa== useing 1/4 inch dia=ater wire in a curved conduit.
He feels the ese of grouted tanda== is premature in that the corrosion pretsetion provided by grouting mest be balanced against the loss of in-earvice taspectism and the ability te verify the proper individual tensioning and allow re*==4=4a= of the tendous during the lifetime of the structure.
As the understanding of these vessels natures a possible acceptabla prograci te monitor the effectiveness of the prestressing tendons during the entira lifetime of the vessel would involve the following two requirements, (1)
ImaYa g a representative portion of the installed tendoes angroutad in order to monitor for loss of tensioning and (2) instruenting the vessel for critical strees levels and for di====4amm1 stability combined with relatively frequent design pressure tests. The established lifeti'ac cf instrument sensors te nemitar stresses within concreta is less ths.n the expected life-time of a containne.at vessel. Until the long ters reliabiliry of stress-strain sensors is established and there is better understanding of detailed stress levels within the vessel, he would not reen==end approval of such a program.
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Roger.S. Boyd...
Currently, the principle proponents of grooted tendons are the Prench, and they are not grouting some 50 of the installed tendons in their recent PCRV in order that they can monitor the possible loss of pre-stressing. In some ways, the duty cycle of a PCRY is less severs and more predictable than that of a cournir=ent vessel.
This probism must be resolved before the granting of a construction permit as little or nothing can be done to influence the design and use of the vessel during the operating permit stage.
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C. C. Long, DRL N. H. Davison bec:
- 2. C. DeYoung S. Levine Distribution:
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