ML20205B804
| ML20205B804 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 08/04/1986 |
| From: | Bailey J GEORGIA POWER CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| GN-1028, NUDOCS 8608120153 | |
| Download: ML20205B804 (15) | |
Text
.
Georgia Fbwer Company Pbst Offic3 Box 282 Waynesbora Georgia 30830 Telephone 404 554-9961 404 7244114 Southem Company Services, Inc.
Post Office Box 2625 Birmingham, Alabama 35202 Telephone 205 8704011 Vogtle Proj,ect August 4, 1986 Director of Nuclear Reactor Regulation File: X7BC35 Attention:
Mr. B. J. Youngblood Log:
GN-1028 PWR Project Directorate #4 Division of PWR Licensing A U. S. Nuclear Regulatory Commission Washington, D.C.
20555 i
REF: LETTER GN-910 DATED MAY 16, 1986 NRC DOCKET NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 V0GTLE ELECTRIC GENERATING PIANT - UNITS 1 AND 2 FIRE DAMPER INSTALLATION DEVIATIONS 4
Dear Mr. Denton:
Enclosed are the illustrations of the Wall Test Report that were missing in the above referenced transmittal. In addition, enclosed are pages of the UL Test Reports that UL revised and resubmitted. The corrected lines are denoted with asterisks.
If your staff requires any additional information, please contact me.
Sincerely, h.f J. A. Bailey Project Licensing Manager JAB /sm xc:
R. E. Conway NRC Regional Administrator R. A. Thomas NRC Resident Inspector J. E. Joiner, Esquire D. C. Teper B. W. Churchill, Esquire W. C. Ramsey M. A. Miller (2)
L. T. Gucwa B. Jones, Esquire Vogtle Project File G. Bockhold, Jr.
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Mr. B. E. Gregory III PO Box 282
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Waynesboro, GA 30830 I'
Product:
y Service The following material resulting from the investigatie under the above numbers is enclosed:
Additional Volume of Follow-Up ServiceProcedure.
AdditionalSection for Volume of Follow-Up Service Procedure.
O nevised or new pages and illustration for Follow 41p Service Procedure:
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vt Please file revised pages and illustrations in phee of material of like identity. New material should be filed in its proper numerical order.
O complete revision te replace Volume ofFollow-UpService Procedure issued O neport.
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see Addenden E Fi ueron f
Please review this material and report any inaccuracies to referring to the above project number.
JI sf Bao. E se:K.Walrekar-ryt (4)-emo Semans Immesten ansktal Power omrp.,
UNDERWRITERS LABORATORIES INC.
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4 File NC976 Page 3 Issued:
4-14-86 Revised:
6-23-86 l
The ready-mixed concrete obtained from a local source consisted of one part Portland Cement, 2.15 part sand, and 3.2 parts gravel, by bulk volume, mixed with approximately 6 gal of
- water per bag of cement.
The compressive strength and density of the concrete at 28 days, as determined from standard 6 in. diameter by 12 in. cylinders, averaged 4096 psi and 143.pcf, respectively.
The average slump during placement was 5 in.
After curing at ambient conditions for approximately 24 days, the concrete floor was placed into the steel test frame and
('N) 75 percent maximum) for fire exposure.
When the curing was force cured to obtain an acceptable moisture content (i.e, s,
completed, a cementitious mixture was applied to the fire side of the floor along the sides to protect the structural steel angles and steel test frame.
1 SAMPLE INSTALLATION i
The samples of sleeved fire dampers were installed in the floor openings by employees of the Zack Co.
The installation was witnessed by the technical and engineering staff of Underwriters Laboratories Inc.
The two dampers were shimmed into the openings using 3 in.
deep by 1/4'in. thick steel plates.
The width of the plates was cut to fit the opening.
The plates were welded to the damper sleeves with a 1-1/4 to 1-1/2 in. long weld on each side.
The 4
j dampers were slid into the floor openings after attaching the shim plates.
Clearances of 1/8 to 1/4 in. existed between the shim plates and the floor opening in some places.
The shims were
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located on the upstream and downstream faces of each damper, on each of its four sides, approximately 1/4 in. in from the face of the floor on both sides.
t The damper in opening No. 7 was retained in position using i
No. 10 gauge steel cover plates welded to the damper sleeve only
- on both faces of the opening, as shown on ILLS. 4 and the horizontal support plan on the nonfire (top) side of the opening i
as shown on ILLS. 4 and 5.
Each cover plate was formed from four l
pieces of 3-1/2 in, wide steel plates which were continuously 4
welded to each other at the four corners.
The cover plates were i
welded to the damper sleeves with 2 in, long welds spaced 5 in.
on center, with one weld at each corner.
The damper in opening No. 8 was retained in position using a j,
No. 10 gauge steel cover plate on the nonfire side and a Type 84 support on the fire side.
The cover plate war. same as described j
above.
The Type 84 support consisted of structural steel angles, 3/8 in. thick, welded to the damper sleeve and embedded angles
- along four sides with 1 in. long welds spaced 5 in. OC, with one weld at each corner as shown on ILL. 6.
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File NC976 Page 6 Issued:
4-14-86 Revised:
6-23-86 HOSE STREAM TEST:
METHOD Immediately after the 180 min fire exposure, the test assembly was withdrawn from the furnace and subjected to the impact, erosion and cooling effects of the 45 psi hose stream for 4 min, 22 s as specified in the test standard for a 3 h fire exposure.
At approximately 2 min into the hose stream test, it was observed that a momentary pressure surge caused the pressure
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at the base of the nozzle to increase above the 45 psi required.
( j While immediately attempting to adjust the pressure down, the hose stream was inadvertently stopped.
The pressure was readjusted to 45 psi at the base of the nozzle and the hose stream was continued to complete the remaining 2 min, 22 s.
RESULTS During application of the hose stream, the bottom blades in both dampers became unlatched and the blade packages opened up to
- result in visible through opening between the leading edge of the bottom blades and the top edge of the frame guide channel.
The damper frames had buckled to result in clearances of approximately 1/8 in. maximum between the frames and sleeves although no visible through openings were apparent.
The blades in the 35 by 35 in. damper had opened to leave a visible through opening along the entire blade length between the bottom blade and frame guide flange of 1-1/8 in. at one end to 1 in. at the other end.
Similarly, in the 44 by 48 in. damper, the blades had opened to leave visible through openings of 1-1/2 to 1-3/4 in. at one end to 3/4 in, at the other end.
The spring ramp in the north bottom corner of the 44 by 48 in, damper was twisted out toward the center of the damper by
/N approximately 1/4 in. maximum.
The negator spring had partially
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slipped off of the arbor post due to the twisting.
s Warping of the cover plates on the nonfire side of the floor assembly was minimal.
t On the fire side, some of the concrete around opening No. 7 for the 44 by 48 in damper had chipped away and the cover plate had buckled to result in clearances between the cover plate and floor of approximately 3-1/2 in. maximum.
The welds on the Type 84 support for the 35 by 35 in. damper were all intact and warping of the embedded angles was minimal.
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Jamargia Power Company, Plant Vogtle Mr. R. B. Gregory III O wnne t i. N v mc O m 1.mp. E.s',enve is m mim.n u PO Box 282 1.... ri. 33es Waynesboro, GA 30830 Atta:
L Product:
Type Service lA f e The following material resulting from the investigation under the above numbers is enclosed:
O AdditionalVolume of Follow-Up Service Procedure.
AdditionalSection for Volume of Follow-Up Service Procedure.
O Revised oyes and iiimtration ror rollow-up Service Procedure:
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N Please file revised pages and illustrations in place of material of like identity. New material should be filed in its proper numerical order.
Complete revision to replace Volume of Follow-UpSersice Procedure issued Report.
@ Reportrevisions:
see made Please review this material and report any inaecuracies to Margaret Figueroa referring to the above project number.
.7 Lied eso. mapart Keanne Landstan ec:
Mr. Eris Walrekar mocktal Powsm omrp., see UNDERWRITERS LABORATORIES INC.
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l File NC976 Page 2 Issued:
3-13-86 Revised:
6-19-86 IgSI ggcggg g g.
1 FIRE ENDURANCE AND HOSE STREAM TEST (WALL A) :
SAMPLES The three samples of fire damper submitted for testing in Wall A were as indicated above under " Fire Damper Test Samples".
At the submittor's request, (1) all of the dampers were in the closed position for the start of the test, and (2) all dampers were mounted with the latch side toward the fire (see ILLS. 3 through 6).
TEST WALL A 12 in. thick concrete wall was prepared for the test.
Three openings were located in the wall as specified by the submittor and as shown on ILL.
1.
The sizes of openings provided for the dampers are shown below.
Construction of the test wall was witnessed by members of the technical and engineering staff of Underwriters Laboratories Inc. and the Zack Co.
1 Overall Damper Damper Size Wall Opening Size Opening No.
Tag No.
WxH, in.
WxH, in.
1 A-1500-57-001 66 x 30 70 x 34 l
2 A-1500-57-001 36 x 60 40 x 64 l
5 A-1500-57-007 36 by 36 40 by 40 i
The overall dimensions of the concrete wall were 178 in.
i wide by.143 in, high.
The wall was cast in sections on the floor of the construction area using wooden forms.
The mating edges of the individual sections were keyed using male and female slots as shown on ILL. 8.
Steel rods were placed on chairs to provide the l
required reinforcement as shown on ILL. 8.
The dimensions of the individual concrete sections were as shown on ILL. 1.
i t
l The ready-mixed concrete obtained from a local source 1
consisted of one part Portland Cement, 2.15 part sand, and 3.2 parts gravel, by bulk volume, mixed with approximately 6 gal of i
- water per bag of cement.
The compressive strength and density
)
of the concrete at 28 days, as determined from standard 6 in.
i diameter by 12 in, cylinders, averaged 4399 psi and 141.2 pcf, respectively.
The average slump during placement was 5.1 in.
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a File NC976 Page 10 Issued:
3-13-86 Revised:
6-19-86 After curing at ambient conditions for 12 days, the concrete sections were placed in the steel vertical test frame in the same manner as described in Test Record No.
1.
The 69 by 79 in, j
section of concrete with no opening was cut in two pieces to ease placement into the test frame, i
SAMPLE INSTALLATION l
l The samples of sleeved fire dampers were installed in the s
wall openings by employees of the Zack Co.
The installation was
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witnessed by the technical and engineering staff of Underwriters
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Laboratories Inc.
As indicated previously, at the request of the submittor, all dampers were mounted with the latch side toward the fire.
The three dampers were shimmed into the openings using 3 in, deep by 1/4 in. thick steel plates in the same manner as described in Test Record No. 1 and as shown on ILLS. 6 and 7.
The location of the shim plates on the fire side of the opening was as shown on ILLS. 6 and 7.
The dampers in opening Nos. 3 and 4 were retained in position using No. 10 gauge steel cover plates on the nonfire side and Type 84 supports on the fire side.
The cover plates were constructed and attached in the same manner as described in Test Record No.
1, and as shown on ILLS. 4 through 7.
The Type 84 support consisted of steel angles, 3/8 or 1/2 in. thick, l
welded to the damper sleeves and embedded angles along all four sides with 1 in. long welds spaced 5 in. OC, with one weld at each corner, as shown in ILLS. 5 and 6.
l METHOD The fire endurance and hose stream test was conducted in accordance with the Standard of Underwriters Laboratories Inc.
for Fire Dampers and Ceiling Dampers, UL 555.
Prior to the test,
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each damper was cycled at least three times by the submittor to verify proper operation of the dampers.
The fire damper assemblies, previously described, were subjected to the test with all dampers in the closed position at the start of the test as indicated previously in this Report.
The appearance of the unexposed and exposed faces of the test assembly prior to the test are shown on ILLS. 15 and
- 16, respectively and after the test on ILLS. 10, and 20 and 21
- (unexposed) and 22 (exposed).
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