ML19206A920
| ML19206A920 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/25/1970 |
| From: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| To: | John Miller METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7904210616 | |
| Download: ML19206A920 (3) | |
Text
.
+
~
~
June 25, 1970 Dis t rib u tic:' :
- cc'.e t.;o. 50-32] /
Attorney OGC
.CRS (IS)
".s. '. ;te r ( 2 )
Seismic Design Censultar-Orig: DFEcss Metropolitan Edison Cor:pany
'est C.# fica 3e'- 54 2
'.e2 ding. Pennsylvania 19603
- tention: ':. J. G. :: iller 71;e Frasident and Chief Dngineer Gen tlemen :
Pe ha're co cleted the firs t phase of cur review of the pos t-tensicnine anchorage syste to be used in the contain:ent structure of Three ':ile Island ;uclear ' station Ut.it '?o.
2 as described in a 3 urns & .ce, Inc.
recorc dated February 1970.
'ie are encicsing requests for additional information. Adequate rescenses to these requests will enable us to co
.ete our revie'7.
'.le will be pleased to discuss these :stters further at your convenience.
Sincerely,
.Ud51 S* ed M s
g.
DtXlh OS{.
Peter A. Morris, Director Divisien of Reactor Licensing Zaclosure:
Additional Infor=ation Requirements cc:
D.s trib u tion :
G_orge F. ".rewb ridge, Esq.
Decket R.
S.
3:yd Shaw, Pittnan, Po tts,
C. DeYc ung Trowbridge 5 !adden DR Reading D.
Skcvhcit 010 17th Street, :;. 'a'.
DRL Reading T. R.
illson Washingten, D.C.
2000c P'.iR-2 Re a din g I.
G. Case C. K.
Beck R.
R. ':ac:a rr
- 1 'i. Mann R.
.4. 7.le nke r S. F.anauer DRS /DRL 3 r C'
?.
S ch roe de r F.
Kar2s f
j
]m.,
j emcr > ii....2.":
f, ^-.
f.-
r --,,, r
,,S.
/.s g'-
-..,,,.s.,r
- r ' %,,f.g/
^L N_..
, - 4. 2.. _ _..
r.
/
('
\\
~*r
/
g f'.y91 i
ge \\
l 3
I SURuME >.
S 3 I P E..
CC 5:3~
AE.ON OFM...
F_S h f:e d_e_ _,P)7prpij 7
O. e. 3 I
a
, - i.
',U-9 5. -.,;, p;---......-.._o_./ _ v./ p. q
- s d <a 9..
....e..---.--5 ', 9,
-g>'
nJ....
F arm AEC-ils an 9 53 AEC31 0:40 a s m e...s =,.=i r.s ha w,,..n.M.A, F
790421c6 6
/1
o ENCLOSURE THREE MILE ISLA'iD NUCLEAR STarI05, U'il! NO. 2 (Docke t No. 50-320)
STRESSTEEL S/H A'iCHORAGE SYSTEM (Bu rns & Rce, Inc. Report Dated February 1970)
ADDITIONAL INFOR".ATION PICUIREMENTS 1.
List ACI, PCI, ASCE and ASTM standards, specifications, codes, and other supplemental requirements which will be applied in the proposed S/H anchorage system.
For elecents of tne S/H syste= not covered by these specifications and codes, identify the specifications which apply to the design, f abrication and erection.
If test results support the suitability of the S/H anchorage system, correlate test results and methods with the applicable requirerents of specifications, ccdes, and criteria.
2.
List references of other applications of S/H syste=s with slotted wedges similar to the one proposed for this f acility, and include a descriptien and typical drawings of the S/H system including location of grouting pipes and vents.
3.
Specify, for the principal elecents of the S/H system, the manufac-turing processes, heat treatments, fla:e cutting, and welding pre-cautions (to preclude notch effects), ncndes tructive tes ting and acceptance s tandards, sampling procedures, and applicable s tandards which will be used to qualify =aterials, and centrol the quality of the f abricated cc=penents.
4 Discuss the capability of S/H system to maintain lcng-tern loads (over the service lifetime), without potential failure of component parts and wedges, or withcut excessive relaxation.
If test data are available to support system performance, provide such data including descrip tien of tested assembly, test procedures, and conditions of the Three-Mile Island S/H system application.
5.
Evaluate the potential ef fects that erection and service conditiens may have en the structural degradation of the system when considering:
a.
Condition at erection of f aying surf aces of wedges and bearing blocks (dry, lub ricated, dus ty, gritty) '
b.
Variability of hardness properties of wedges ;
c.
Corrosion of wedges (especially in slots), wedge-s trand, and wedge bearing-block interf ace ;
d.
Hydrogen embrittlement; e.
tracking of concrete under the bearing plates ;
f.
Stability of wedge anchors, and nonslippage of strands under sudden tendon load reduction, or tendon vibratien.
63~102
-ti) 5 6.
Discuss and evaluate the strand arrangement and twist in curved tendons with respect to the potential weakening ef fects that this arrangement and curvature may have on the performance of the system, especially under dynamic loading.
7.
With regard to the proposed corrosion protection grouting specify:
a.
The experience available with grouting of long vertical tendons; b.
The grout capability to penetrate between the wires and provide protection for the wedges and the wedge-grip-strand and wedge-bearing-block interf aces ;
c.
The provisions that will be made to acco==odate grout volume variations and prevent the for=ation of voids, or blockages in ducts.
8.
List anchorage efficiency perfor ance data en the basis of actual ultimate strength of wire and strand.
Clarify the ter=, " Percent of Guaranteed Ultimate Strength."
9.
Describe the quality assurance organization and program which will be used in the manuf acture and erection of the S/H system, including specifically the quality control measures that will be applied to wedge threads, taper angle, splay plates, wedge plates, bearing plates,
and ducts; duct placecent, tendon tensioning, bearing plate centering, and all interf ace surface ccnditions.
e G3--103