ML19256F544
| ML19256F544 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 12/17/1979 |
| From: | Broehl D PORTLAND GENERAL ELECTRIC CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19256F545 | List: |
| References | |
| TAC-07551, TAC-11299, TAC-7551, NUDOCS 7912190379 | |
| Download: ML19256F544 (16) | |
Text
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Portland General ElectricCompany Ev. : n E m es we,,ce Pe:x-December 17, 1979 Trojan Nuclear Plant Docket 50-344 License NPF-1 Director of Nuclear Reactor Regulation ATTN:
Mr.
A.
Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors U.
S.
Nuclear Regulat'ory Commission Washington, D.
C.
20555
Dear Sir:
Attached are 40 copies of Licensee's response to several of the NRC Staff questions of September 14, September 20, September 28 and October 2, 1979.
Sincerely,
$/
Attachments c:
Mr.
R.
H.
Engelken, Director U.
S. Nuclear Regulatory Commission Region V Mr. Lynn Frank, Director State of Oregon 1620 289 i21 S W Sa mon 5:'eet Pot at C egcn 97204
NRC Questions (9/14/79)
Q. 3 Page 1 of 4 Provide a listing of all areas containing safety-related cables or equipment in which wood framing will be used during the modification work.
Answer:
Though the question addresses only the use of wood framing, this response identifies each instance during the modification work when wood will be used in the vicinity of safety-related cables and/or equipment.
Wood forms will be used in the following areas during the modi-fication program for placing of concrete and grout for the new walls along column lines N,
N' and R,
and along column line Q:
a)
At the new N line wall up to approximately el.
95'-3".
b)
At the new R line wall to place concrete up to approximate-ly el. 77'; and to place grout behind the steel plate from approximately el. 77' to approximately el.
97'-3".
c)
At the new N' line wall to place concrete up to el.
65'.
d)
At the new locker room doorway at el. 45' along column line Q.
i
'l 620i s?90
NRC Ouestions (9/14/79)
Q.
3 Page 2 of 4 Within these areas, wood framing for forms will be used in the following locations which contain safety-related cables and/or equipment:
1)
In the Electrical Auxiliaries Room along column Line N around the equipment hatch and around the columns at the intersection of column lines R and 41.
2)
On the east (outside) side of the N line wall, at ap-proximately el.
72', around the Battery Room exhausts.
3)
On the west side of R line wall between el. 69' and el.
93', both around the openings in the steel plates where cables penetrate the walls, and around the outside edges of the steel plates.
4)
Wood form work may be required below grade (el. 45') in the railroad bay for the grade beams supporting the new R, N'
and N line walls.
If needed, this form work will be located in the vicinity of the service water piping, diesel fuel oil lines and the electrical duct bank.
Those items will be separated from any necessary wood form work by a minimum of 3 inches of sand.
Figures 3-1 through 3-4 show locations of the above described wood form work, as well as safety-related equipment and cables in its vicinity.
(These figures are substantially the same
[620291
NRC Questions (9/14/79)
Q. 3 Page 3 of 4 as attached to Licensee Response dated August 13, 1979 to NRC Question No. 7.)
Wood cribbing will be used as Plate 8 is being lowered into place.
The wood cribbing will be described in detail in re-sponce to NRC Staff Question No.
6, dated September 14, 1979.
The figures attached to that response will show the location of the wood cribbing, as well as the location of the safety-related cables which penetrate the R line wall in the vicinity of the wood cribbing.
Wood planking will be used to protect cables in the Cable Spreading Room from a drop of plate washers.
The wood plank-ing is described in detail in Licensee's response dated November 21, 1979 to NRC Staf f Question No.
4, dated September 14, 1979.
Some lightweight wood 2x4 's will be used as framework for a plastic enclosure to be utilized in the vicinity of column 41R encasement removal at el.
65'.
This enclosure and its location will be described in detail in Licensee's Response to NRC Staff Question No.
7, dated September 28, 1979.
The wood cribbing, the wood planking, and the wood for the plastic enclosure framework will be treated with "Flamort-WC,"
a fire retardant.
This fire retardant can be applied on
~
lh2i}~ 292
NRC Questions (9/14/79)
Q. 3 Page 4 of 4 site and has been approved for such use by the Plant's Insur-ers, American Nuclear Insurers.
In order to avoid any pos-sibility that the fire retardant could adversely af fect the new concrete, no wood to be used as concrete formwork will be treated with the fire retardant.
The fire retardant will have no deleterious effect in the areas in which it is used.
As discussed in more detail in Licensee's response dated November 21, 1979 to NRC Staff Question No.
4, dated September 28, 1979, Licensee will have a fire watch inspect, on an hourly basis, any area where a fire could af fect safety-related cables or equipment whenever wood (whether or not treated with fire retardant) for the modification work is present in that area.
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NRC Questions (9/14/79)
Q. 5 Page 1 of 5 Your response regarding the use of grout for installa-tion of rebar into the existing walls and rock does not adequately justify its acceptability in these applications.
Therefore, provide the following:
a)
Verification that inactive carbon, sand and cement are the only constituents of the grout and that con-tains no other materials.
b)
Substantiation that the expansion of the grout in only the plastic stage is sufficient considering the effects of any shrinkage which may occur beyond that in the plastic stage.
If there is any expansion be-yond the plastic range, substantiate that it's effects are negligible with regard to splitting of the exist-ing materials (block, concrete, etc.)
c)
Test data which substantiate that the use of this grout (1) in holes of dimensions similar to those which will be used at Trojan, (2) in materials similar to those in which the rebar will be grouted (i.e.,
concrete grouted masonry block and rock), and (3) using the same type rebar as that to be used at Trojan that the full rebar strength will be deve-loped in every case.
In addition to the tests men-tioned in the specification CRD-C588-78, the follou-ing test should be performed:
- 1) tensile tests on the grout in accordance with ASTM Specification C190-77, and 2) strength tests of full-scale specimens 9,
NRC Questions (9/14/79)
Q. 5 Page 2 of 5 representing the proposed anchorages in accordance with the spirit of ASTM Specification E-488-76.
Answer:
(a) The attached letter (Attachment 5-1) from U.
S.
Grout Corporation verifies that Five Star Grout, the grout to be used for installation of rebar, consists of three components:
1) a high early strength Type 3 cement 2) a fine silica sand 3) a non-reactive chemically inert aggregate called Pernanent Life Aggregate (PLA).
Permanent Life Aggregate, as specified in the attached letter, is a chemically inert form of activated carbon.*
Activated carbon is porous carbon which has affinity for water.
When the activated carbon contained in the grout comes in contact with the mixing water, it absorbs water which displaces the air contained in its pores.
The air thus released into the grout paste expands due to the heat of hydration.
This mechanism gives the expansive characteristic to the grout during the setting process.
The percentage of the constituents by dry weight of total
- Licensee's response dated September 5, 1979 to URC Structural Branch Question 7 incorrectly characterized PLA as inactive carbon.
162'O 299
NRC Questions (9/14/79)
O.
5 Page 3 of 5 grout mix are: 42% Type III cement, 51% silica sand, and 7% PLA.
The water / cement ratio will be up to. 50 by weight.
Thus, the water added to the grout will be up to 21% of the dry weight of the mix.
(b) Testing of the grout to ASTM C-827 has established that expansion will occur while the material is in the plastic stage.
(See Attachment 5-1).
Testing to CRD-C588-78*
shows that Five Star Grout does not exhibit either sig-nificant expansion or shrinkage after hardening.
(See -2).
(c) Within the Complex, rebar will be grouted only into core concrete.
Connection details are being revised to obviate the need for grouting rebar into masonry.
The rebar grouted in rock for the rail stop anchorage will each be pull tested after installation to verify that they can develop the design loads. -3,
" Pullout Resistance of Reinforcing Bars Embedded in Hardened Concrete" by R.
L.
- Stowe, U.S.
Army Engineer Waterways Ex pe rimen t Station C-74-12, 1974",
discusses the 92neral subject of grouted rebar tests and provides results of extensive testing by this laboratory.
Data on tests performed by West Penn Testing Laboratories established that under conditions very similar to those at Trojan, rebar grouted into concrete developed their full The referenced tests were performed to CRD-C588-76 specifications; however, with respect to the applicability to these tests there is essentially no dif ference between CRD-C588-76 and CRD-C588-78.
1620 300
NRC Ouestions (9/14/79)
Q. 5 Page 4 of 5 strength without failure of the grout. (See attachment 5-4).
The following comparison establishes that the tests referenced above sufficiently reflect the way in which rebars will be grouted at the Trojan Plant, such that the results of the tests are directly applicable:
1.
Hole dimensions:
2.75 in, dia. at test, 2.5 to 3 in.
dia. a t Troj an.
2.
Materials in which rebar will be grouted:
5000 psi design strength concrete in both cases.
3.
Types of rebar:
60 ksi deformed bars #6 and #7 tested; 60 ksi deformed bars #5, #7, and #9 at Trojan.
4.
Type of grout material:
Five Star in both cases.
5.
Water / dry grout mix ratio: 23% in test; up to 21%
for use in modifications.
6.
Embedment Length:
The major difference between the tests and the Trojan condition will be the embedment length.
Trojan will use embedment lengths as required by the AC1 Code.
The tests were performed with only only 10 in.
embedment length, which is shorter than that required by the ACI Code.
Consequently, the test results relied upon are conserva-tive with respect to their applicability to the intended 9
i620.501
NRC Questions (9/14/79)
O.
5 Page 5 of 5 installations at Trojan.
Furthermore, the tests were performed in accordance with the spirit of ASTM Specifica-tion E488-76.
Test data which substantiates compliance with CRD-C588-78*
is attached (Attachment 5-2).
Tests performed in accor-dance with ASTM C190-77 indicated that the tensile strength of the Five Star Grout is 722 psi (Attachment 5-1).
Prior to the start of construction, installation procedures and techniques will be developed for grouting rebars in the horizontal, vertical upward, and vertical downward positions.
The techniques will be demonstrated by actual field pullout tests to verify that the grout can be adequately placed.
Although it is not presently planned, once construction com-mences, the need may arise to grout rebar into masonry.
Confirmatory tests will be performed on actual Trojan block walls to verify the adequacy of such anchorage prior to use.
See note p.3.
4 p
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ATTACHMENT 5-1 U.S. G RO UT CO R PO R ATIO N ENGINEERING AND TECHNICAL CENTER 1154 56 E AST PUTNAM AVENUE e RN'ERS'DE CONNECT: CUT C6978 m (203' 637-4'R5 September 19, 1979 Messrs. Ted Bushnell & Don Broehl:
PORTLAND GENERAL ELECTRIC 121 S. W. Salmon Street Portland, OR 97204
Dear Messrs. Bushnell & Broehl:
This is to certify that Five Star Grout consists of three compcnents: A high-early strength type 3 cement, a fine silica sand, and a non-reactive chemically inert aggregate called PLA (Permanent Life Aggregate). PLA is a chemically inert form of activated carbon.
Expansion will occur while the material is in the plastic state when tested by ASTM C-827 and will exhibit no shrinkage or expansion after hardening.
Five Star Grout conforms to the specified criteria in CRD-C-588 and may ex-hibit a minute amount of expansion by this test.
Five Star Grout has a tensile strength of 722 psi when tested by ASTM C-190-77.
All additional data on pull-out test and volume change are being forwarded
,under separate cover.
Very tr,uly yours,
/ l O'1'~
John Reilly
/
Asst. Mgr. Industrial Division JR:jg
Enclosure:
cc:
Mr. Everett L. Thompson 14806 Bothell Way N.
h.., Apt. 326 Seattle, WA 98155 (206)363-8829 i620 3D3 MAIN OFFCE OLD GREEN'MCH CONNECTCUT 06870 (203) 637 4r3 m TELEX. 9M541 s CABLE. FNE S
I ATTACHMENT 5-2 Qp]
i CO N ST R U CTI O N PRODUCTS R E S E AR C H, I N C.
+ Cable CPA The Beacock Bw loing.o.d Greenw ch.Cc.nnect. cut o687o. Phone (2o3) 637 2002 r
CE RTIFICATION Date:
May 11, 1978 Product:
Five Star Grout Water Added for Test:
23% by weight Lot Number:
C780322 04 Volume Change, ASTM C-827 Max, %
+1.9%
3 Day _
7 Day 14 Day 28 Day Expansion, CRD-C-588-76
+.03%
+.03%
+.03%
+.03%
CoIpressive Strength ASTM C-109 9200 1 Day 9300 2330 psi 9500 7 Day l0bb 5280 psi 21200 Oime of Set ASTM C-191 Final 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> 20 minutes This is to certify that the above tests were performed on a sample of material taken from the above lot and that the above results were obtained.
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fia$a D.
Vice President e.
1/i20 3d4
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