W3P83-3180, Advises of Installation of Removable Section of 3BS Diesel Generator Room in South Wall.Installation of Wall Will Be Documented in Amend 34 to FSAR

Advises of Installation of Removable Section of 3BS Diesel Generator Room in South Wall.Installation of Wall Will Be Documented in Amend 34 to FSAR

ML20080P571
Person / Time
Site:	Waterford
Issue date:	10/03/1983
From:	Drummond F LOUISIANA POWER & LIGHT CO.
To:	Knighton G Office of Nuclear Reactor Regulation
References
W3P83-3180, NUDOCS 8310070235
Download: ML20080P571 (12)

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o eox eoOe 70174-8008 9 (504)366-2345 MIDDLE SOUTH UTIUTIES SYSTEM October 3, 1983 W3P83-3180 3-A1.01.04 3-P43 3-Al.10 Director of Nuclear Reactor Regulation Attention:

Mr. G.W. Knighton, Chief Licensing Branch No. 3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.

20555

SUBJECT:

Waterford SES Unit 3 Docket No. 50-382 Removable Section in South Wall of Diesel Generator 3BS Room

Dear Mr. Knighton:

The purpose of this letter is to inform you of the installation of a removable section in the south wall of the 3BS Diesel Generator Room (Note Attachment 1, Figure X-5 showing the subject wall separating RAB 15 and RAB 23). This subject was previously discussed with Mr. D. Kubicki, of the NRC staff, during a telephone conversation on September 14, 1983 with LP&L's Mr. E. Senac.

The south wall of the 3BS Emergency Diesel Generator Room has now been fitted with a thirty by nineteen foot, twelve inch thick section consisting of re-movable, acoustical, fire rated panel assemblies. These assemblies, known as

" Fire-Noise-Lock Panels", and manufactured by Industrial Acoustics Company replace the previous block wall configuration. The individual panels are four inches thick and have been tested and fire rated by UL for 90 minutes with fire facing the sound absorptive surfaces (i.e., from the 3BS EDG Room side), and 45 minutes from the solid surface (i.e., from the south corridor side, RAB 23).

The wall actually consists of two layers of these panels separated by four inches of air; each layer has the sound absorptive side facing the EDG Room.

Please note that the appropriate vendor documents have been attached for your review (Attachment 2).

This arrangement is a change from that currently described in the FSAR, which states that the two fire areas interfacing at this wall (RAB 15/3BS-EDG Room and RAB 23/ Corridor Area and Common Passageway) are separated by a three hour barrier. As construction proceeded it was apparent to LP&L that it was es-sential for the subject wall to be removable in order to allow maintainability of the 3BS EDG.

The removal of the 30' x 19' section will provide access for the passage of maintenance equipment and large parts associated with the diesel.

8310070235 831003 I l PDR ADOCK 05000382 i

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Page 2 W3P83-3180 3-A1.01.04 3-P43 3-A1.10 When the removable wall is viewed in conjunction with other fire protection measures provided at these two adjacent areas, as described below, one should be assured that adequate fire prote tion is being provided.

The removable panels are rated at 90 minutes each from the 3BS EDG Room side and 45 minutes each from the corridor side, with automatic suppression and detection provided on each side.

In addition, there are four manual hose stations located in the area, several fire extinguishers and a fire locker (the locker contains extra hose, additional extinguishers, a portable foam unit, a smoke ejector and self contained breathing equipment).

Furthermore, excellent access is provided for a fire brigade and equipment via the large double doors on the west side of the RAB and by way of the corridors leading to the area.

It should also be pointed out that the combustible loading in the RAB 23 is very low (0.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />).

In fact, the ratio of cosbustible load to barrier rating here would compare favorably to that of many other plant areas. LP&L therefore believes that the substantial defense-in-depth protection, which includes administrative controls as well as the hardware described, provides adequate protection to the plant equipment throughout this area.

LP&L intends to revise the FSAR to document the installation of this wall in Amendment No. 34.

If there are any questions please call Mr. E. Senac at (504) 467-2791 or Fk. K. Curley at (504) 363-8950.

Yours very truly, p=_=

F.J. Drummond Nuclear Services Manager FJD/EJS/ch Attachments cc:

J. Wilson (NRC)

D. Kubicki (NRC), L. Constable (NRC, Resident Inspector),

W.M. Stevenson, E.L. Blake, K.N. Curley, Central Records, Nuclear Records (4),

Licensing Library Note: All original attachments to D. Kubicki; all others, Attachments 1 & 2 only

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.I I'i PREPARATION FOR INSTAL.t.ATION f'

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Read and understand all instructions before proceeding. Contact

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5.

Check that holes for eyebolts are present in 4' long edges of larger panels and that holes are clear and thrieads usable.

LOutclANA POWER A LIGHT COMPANY The edge having these holes is tne top of the panel. These holes are WATERFORO S E.S. UNIT NO. 3 lif ting eyebolt attachment points.

CONTnACT NO. g. oM srv,cwro wiinour couuu rs.

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6.

Refer to anchor bolt layout and to hole location drawings which f.

A nrvnwto wirw comtetsas worco-will be provided hen the order is shipped. Install all anchor qlno cm,%y.

m bolts and provide required tapped holes in existing 12" channels a

ururs worneur nerunwo 4

which fra ne top and sides of opening.

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Q;5 7.

A movable scaffcid having a floor height of about 14' will be vo?.ec n nu v,,en

'[lb m nir required for nanual installation of the top row of panels. Other P' Proucints o',

c panels may be lifted into place using a crane capable of lif ting

. I"'"'oivenite 4

a 400 lb. load to a height of about 16'.

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Before any panel is installed the panel edges all around must be pe orectum o filled with roll insulation, item AA shown in section A.A. (Dwy B-1)

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' INDUSTRIAL AcouST!cs COMPANY w

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.J 1160 COMMERCE AVENtJE RAONY N v 10462 4-FM

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INSTALLATION PROCEDURE (Refer:nces,to right and left hand r;fer t3 el:vation cn sheet 1) 1.

Locate and install floor channels (R) and gaskets (5 6

Holes are prepunched in channels onattached to anchor studs (TI) installed in existing c)oncrete ficor(T) using nuts 16" centers, Attach to floor using bolted angle clips which attach to every thirdErect an' d 2.

anchor stud used to secure the floor channels. These angles nest in the floor channeh.

angle's which bolt into tapped holes to be providedAttach channels to ceilin9 by using clip in roof channel.

EDASCO FitiLD 3.

(A) threaded into tapped holes to be pmvided in reaf and sideInstall horizontal (MI) an VENDOR DOCUMENT v.(g,g'3,gggg. 5 R- 0 channels of opening.

LOUISANA POWER & LIGliT COMPANY 4

Select a 4' x B' panel.

Locate the top 4' long edge, provided with WATEnrOND S E.S UNIT NO. 3 2 tapped holes in the channel,<eb for installation of lif ting eyes coNinACT No. i,g3 0M-}g Install It(ting eyes. Lif t the panel in place in g,osition 1 on in va m o wnnuur cmm un-elevation, sheet 1.

Bottom of panel shall rest in floor channel, i

d in,m o wa n ccw.na:, as wo rto-and sides should rest against plate F1 on the lef t lide and G1 on Ak a

the right side. Remove eyebolts..(See sections A A g po) i no t areucmu -

3 Place approximately 4' long joiner section (V) ove'

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5.

ua,un rea umoouciuts top of panel

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just installed.

procedure of step 4. Install another pan'el in position i following

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.p c,! 'E'"^'E'P Install 16' long section of C4 x 5.4 (BB) per section D-D.

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6.

retain lef t edges of panels 1 and 2.

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Repeat steps 4 and 5 to install panels in positions 2 end 3.

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8.

Install 16' long batten plate (H) to retain right edues of panels 1 and 2 and to retain lef t hand edges of panels 3 and 4.

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9.

Repeat' steps 4, 5, and 8 for the next 5 vertical rows of (2) 8' high panels.

10.

Repeat steps 4. 5, and 6 for the last vertical row OT (2) 8' high panels.

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Install joiners (b) over the tops of all second level panels.

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11.

12,.

Working fr$m lef t to.right install upper level panely.

A scaffold must be used and the panels manually positioned usihg the handles p rovi ded..

(H) to columns (G). Secure upper panels by attaching 2' long sections of batten A 3'51RJ)

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INDUSTRIAL acoustics COMPANY w

JOB

• DWG.

1160 COMMERCE AVENUE BRONX, N.Y.104G2

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INSTALLATION PROCEDURES - CONTINUED I

Af ter all upper panels are installed the spacer channel Z is bolted I !

13.

into the esisting roof channel and through bolts are threaded into the welded nuts of batten Ml. Installation of inner wall is now complete.

14. Move scaffold out of the way and install the outer wall using the same procedure as for the inner wall. Ensure that all M2 and F2 batten plates are installed.

EllASCO FIELD i

15. ReL*Jval is in the reverse orders of installation. The battens are VENDOR DOCUMENT removed in sections and the work must be perforined in correct order to prevent any panels other than the one being removed from becoming V - 6.13-t oo C\\ -

6 R-O I

capable of falling.

LOUISIANA POWER & UGHT COMPANY WA1ERFORD S E S. UNIT NO. 3 CONTRACT NO. \\jjp3. % ;g

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