ML20206U677
| ML20206U677 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 09/29/1986 |
| From: | Miosi A COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 2185K, NUDOCS 8610080099 | |
| Download: ML20206U677 (8) | |
Text
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~~s N Commonwealth Edison Z,
72 West Adarns Street, Chicago, Illinois
) Address Reply to: Post Office Box 767 g
Nd Chicago, Illinois 60690 0767 September 29, 1986 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC. 20555
Subject:
Braidwood Station Unit 1 Fire Protection August 1986 Audit - Resolution of Issues NRC Docket No. 50-456 i
Reference:
September 22, 1986 A.D. Miosi letter to H.R. Denton
Dear Mr. Denton:
The purpose of this letter is to provide you with the other half of data on obstructed sprinkler heads in the Unit 1 Auxiliary Building at Braidwood Station.
The first half of data was provided per the referenced letter for your review.
The data which your staff requested consists of:
1.
A technical justification for leaving the sprinkler head located as is, or 2.
Indicate how the sprinkler head will be moved to avoid the obstructions.
Marsh and McLennon personnel have completed the review of the remaining system in the Auxiliary Building and have provided their report which is attached to this letter.
The M&M letter provides technical justification for leaving some obstructed heads in their present locations and also provides recommendations for the relocation of 9 sprinkler heads.
The M&M review letter only provides comments on the sprinkler heads which they found to be obstructed.
All other sprinkler heads on this system were found to be unobstructed and hence were not mentioned in the review letter.
CECO has reviewed the M&M data and agrees with the technical justifications and recommendations for action proposed by M&M.
CECO will implement these sprinkler head relocations prior to exceeding 5% power pending agreement by the NRC.
8610090099 860929 PDR ADOCK 05000456 b
F PDR go t\\t
. Should you have any questions concerning this matter, please contact this office.
One signed original and fifteen copies of this letter and the enclostiros are provided for your review.
Very truly yours, hLa A. D. Miosi Nuclear Licensing Administrator
/klj encl.
cc:
J.
Stevens 2185K
f*
I M&M Protection Consultants A Resource of Marsh & McLennan September 29, 1986 Mr. D. Elias Project Engineer Commonwealth Edison Company P.O. Box 767 Chicago, Illinois 60690 RE:
BRAIDWOOD NUCLEAR STATION FIRE PROTECTION PROGRAM REVIEW AUXILIARY BUILDING SPRINKLER SYSTEMS
Dear Mr. Elias:
As a result of the NRC Fire Protection Audit of the Braidwood Nuclear Station, on August 18 through August 22, 1986, and subsequent tele-conferences, concerns have been raised regarding obstruction of sprinklers on the sprinkler systems installed in the Auxiliary Building.
Enclosed is our review of the remaining sprinkler system in the Auxiliary Building.
We have re-reviewed this system in accordance with the requirements of Chapter 4 of NFPA 13,
" Standard for the Installation of Sprinkler Systems".
The results of this re-review is contained in the attached document.
222 South Riverside Plaza + Chicago,llhnois 60606
- 312-648-6000
[
t M&M Protection Consultants September 29, 1986 Page 2 If you have any questions or comments concerning our review, please contact us.
Sincerely, S.
. Chingo Fire Protection Consultant lA86
~
4T James B. Biggins Fire Protection Associate SJC/JBB/smn Enclosure 1
cc:
J. Deress J. Bruciak G. Jones M. Pietraszewski C. Tomashek B. Treece C. Diaz R. Williams R. Salsbury E. Fitzpatrick R. Rakowski M. Rybak T. Meyer R. Smith, Jr.
E. Crass D. Shamblin M. Balster M. Smith l
(JB5-14) l l
i i
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- M&M Protection Consultants BRAIDWOOD NUCLEAR STATION FIRE PROTECTION PROGRAM REVIEW SYSTEM:
Protection Area 1-JJ, Component Cooling Pumps; elevation 364'-0",
Auxiliary Building.
DESCRIPTION:
This is an automatic wet-pipe sprinkler system designed using the ordinary-hazard pipe schedule for pipe sizing and spacing, with a maximum spacing of 130 sq. ft. per sprinkler.
Fourty (40) 212*F rated sprinklers are utilized in this system as shown on Viking design drawing 93.
Construction changes, especially those in regard to permanent seismic supports, have occurred since our original review of i
this sprinkler system of December 31, 1985, and as a result, additional obstructions have occured other thatn those which were noted at that time.
Sprinkler Obstruction Comment / Resolution
- 2 This sprinkler is located This sprinkler may be left 7" laterally from a 3" angle as is based upon iron support and 18" above sufficient overlapping a cable tray located 5" spray patterns from away.
adjacent sprinklers.
Sprinkler #1 is located 7'-10" laterally from sprinkler #2, sprinkler #3 is located 7'-10" laterally from sprinkler #2, and sprinkler #7 is located 7'-3" laterally from sprinkler #2, therefore, repositioning this sprinkler is not necessary.
- 7 This sprinkler is Reposition this sprinkler obstructed by an electrical to a position below the junction box (1JB559A).
electrical junction box.
f an.
I M&M Protection Consultants Sprinkler Obstruction Comment / Resolution j
- 8 This sprinkler is located This sprinkler may be left 6" laterally from a 5" pipe, as is based upon sufficient overlapping spray patterns from adjacent sprinklers.
Sprinkler #7 is located 6'-1" laterally sway from sprinkler #8, sprinkler #9 is located 8'-8" laterally away from sprinkler #8, and sprinkler #13 is located 12' laterally from sprinkler #8, therefore, repositioning of this sprinkler is not necessary.
- 10 This sprinkler is located Reposition this sprinkler 2" laterally from a 2" to a location l' laterally seismic support.
from the support.
- '14 This sprinkler is located This sprinkler may be left 3" away from a 11" x 31" as is based upon cable tray support.
sufficient overlapping spray patterns of adjacent sprinklers. Sprinkler #9 is located 12' away laterally, sprinkler #15 is located 7'-4" away laterally, sprinkler #13 is located 9'-11" away laterally, and sprinkler
- 19 is located 10'-21" away laterally from spinkler
- 14; and therefore, repositioning of this sprinkler is not necessary.
- 19 This sprinkler is located Reposition the sprinkler 5" away from a 11" to a position where it is diameter conduit and l' l' away from both the 4" away from a 4" angle iron angle iron and the support.
conduit.
an f
M&M Protection Consultants Sprinkler Obstruction Comment / Resolution
- 24 This sprinkler is located Reposition the sprinkler 8" away laterally from a
. to a Icoation where it is ll" by 34" conduit l' away laterally from the support.
conduit support.
- 25 This sprinkler is located Reposition the sprinkler 4" from a 4" pipe flange.
to a position l' away from the pipe flange.
- 29 This sprinkler is located This sprinkler may be left 7" from a 11" by 31" as is based upon conduit support.
sufficient overlapping spray patterns of adjacent sprinklers. Sprinkler #26 is located 9'-8" away, sprinkler #28 is located 7'-10" away, and sprinkler
- 30 is located 9' away from sprinkler 29, and therefore, reposition of this sprinkler is not necessary.
- 30 This sprinkler is located Reposition the sprinkler 8" away from a 4" seismic to a location where it is support.
l' away from the seismic support.
- 34 This sprinkler is located This sprinkler may be 1" away from a 11" angle left as is based upon iron, 3" laterally from a sufficient overlapping Il" by 31" conduit spray patterns of adjacent i
support, and 15" from a sprinklers.
Sprinkler #33 l
second conduit support.
is located 7' laterally, j
sprinkler #35 is located I
7'-7" laterally, and sprinkler #29 is located 101' laterally away from sprinkler #4, and therefore, repositioning of this sprinkler is not necessary.
- 36 This sprinkler is located Reposition this sprinkler 2" above an 18" cable tray to a position where it is located 2" away.
located either 18" above the top of the cable tray or l' away laterally from the cable tray. m
M&M Protection Consultants Sprinkler Obstruction Comment / Resolution
- 37 This sprinkler is located This sprinkler may be left 15" above a 36" by 48" as is based upon cable tray.
sufficient overlapping spray patterns of adjacent sprinklers. Sprinkler #32 is located 12'-3" away, sprinkler #36 is located 9' away, and sprinkler #40 is located 7'-7" away laterally from sprinkler
- 37, and therefore, repositioning on this sprinkler is not necessary.
- 39 This sprinkler is located Reposition this sprinkler 1" from the 4' by 4' in a manner such as #38 seismic support.
is installed, that being dropping the sprinkler down to a position below the obstructions.
- 40 This sprinkler is located Reposition this sprinkler 6" from a 11" by 61" cable to a location below the tray support, and 8" from cable tray where a 4" pipe.
obstructions will not occur.
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(JB1/1) m