ML19340A370

Requests Info to Supplement Util 720410 Response to Second Round Questions

ML19340A370
Person / Time
Site:	Crystal River
Issue date:	06/14/1972
From:	US ATOMIC ENERGY COMMISSION (AEC)
To:
Shared Package
ML19340A368	List: ML19340A366 ML19340A370
References
NUDOCS 8003250666
Download: ML19340A370 (4)

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.m FLORIDA POWER CORPORATION CRYSTAL RIVER UNIT No. 3

. Docket No. ' 50-302

- REOUEST FOR ADDITIONAL INF010dATION FOR FSAR REVI1N 5.1 Discuss-the manner in which the specified general shell analvses and finite element analyses recognize and address' the cracked state of concrete, and the influence of the prestressing tendon holes on the surrounding concrete for the containnent structure

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Since the analyses did not recognize the cracked s tate of

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concrete for determining the discontinuity nonents and forces, provide' an approximation of the magnitude of the channe in internal forces at the sections of reductions in stiffness resulting from cracking.

In addition, provide an z.pproxination of the nagnitude of internal force chanves induced in sections removed from these areas as redis tribution of internal forces takes' place. Provide assurance that all sections can resis t these redis tributed forces, b.. Distress in the dome of another pres tressed concrete contain-led investigators to evaluate the effect of the loss of ment J

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2-l gross section resulting from the presence of 'the tendons. The

-conclusion as a result of laboratory tes ts was that for the particular arrangement of tendons the nenbrane stresses would increase by approximately 33%. Provide information regarding the effect of this magnitude of change on the nargins of safety and computed stresses for this facility.

5A Describe in detail the procedures used to desim the roof struc-tural steel for the auxiliary building so that it cannot damage the Class I portions of the building under the inposed loads, a.

Provide sketches to illustrate the framing concepts of the s tructural s teel.

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Provide the various loads and loading conhinations fo* the s tructural s teel.

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Indicate unether the protection afforded to the Class I itens from-the collopse of the roof structural s teel will be provideA by littiting the stresses or by. controlling-and predicting the

. collapse techanism(s).

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Provide a eucmary o'f the methods and procedures used to determine member internal forces.

Provide an exar,ple for ene iloading. case to.: illustrate the application of the methods and (procedures..

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e. : Provide' the method ofdetermingl.the internal force envelopes

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- for ;the various merbers and ' design procedure used to proportion meub ers. -

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Provide theidetails.of se reral of the typical joints and 7

connections and the supporting calculations.

5.5 Present additional details regarding the deficient concrete that

. was noted on page 5-15 of the MAR.

Include the rep: son for Con-cluding shere was~ a~-deficiency, how the 'deficiene was dis covered,

- the program used-for correcting the deficiency, and the verfication procedure used to' finally assure that the orieinal reauirerents

..have _ not been comprecis:d.

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Provide the criteria used to evaluate the adecuacy of. in-nlace

!L concretc and the methods used to obtain infornation on the' in-J 4 '

place concrete.

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' b'. ' Recent experiences have indicated t,ignificant cons truction pro-l

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blems relating to steel placement and detailing, and concrete placerent in critical areas of the containment. Describe the 1

provisiens,being made for this facility '.nat will nearly L.

eliminate the occurrence of such proolems.

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4-5.8. For.the Cadweld splice tes t program that was utilized as described-'

l on page 5-17,-' present the following infornation:

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5.8... Justify-the inclusion of 21 specially selected pilot splice l tests samples with 30 production splice. test samples as a l

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group re determine whether the sampling frenuncv can be reauce..

l 5.8.2 Describe what has been done as a result of the outlined test

= progran and indicate whether sanpling freouencies were-reduced.,

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' 5'8.3 Ccepare the - tes t program to A?.C Safetv-Guide No. 10, entitled " Mechanical ~(Cadweld) Splices in Reinforcinst Bars l.

of Concrete Containments."

- 5.8.4 - Present the results of-the Cadweld. tes ting completed to date..

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