L-84-160, Forwards Responses to Structural Engineering Branch Questions Re Pressurizer Heater Transformer Barrier

Forwards Responses to Structural Engineering Branch Questions Re Pressurizer Heater Transformer Barrier

ML17215A460
Person / Time
Site:	Saint Lucie
Issue date:	06/27/1984
From:	Williams J FLORIDA POWER & LIGHT CO.
To:	John Miller Office of Nuclear Reactor Regulation
References
L-84-160, NUDOCS 8407020338
Download: ML17215A460 (8)

Text

REGULATORY INFORMATION DISTRIBUTION 6)

TEM (RIDS)

ACCESSION NBR;8407020338

'DOC ~ DATE: 84/06/27 NOTARIZED; NO FACIL:50<<389 St ~ Lucie Plantg Unit 2< Florida Power L Light Co ~

AUTH~ NAME AUTHOR AFFILIATION HILLIAMSiJiN,

-Flor ida Power 8 Light Co,

.RECIP,NAME, RECIPIENT AFFILIATION MILLERg J R e Opel ating Reactors Branch 3

SUBJECT:

Forwards responses to Structural Engineering Branch questions re pressurizer heater transformer barrier.

DISTRIBUTION CODE:

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~4lly FLORIDAPOWER & LIGHTCOMPANY June 27, 1984 L-84-160 Office of Nuclear Reactor Regulation Attention: Mr. James

.R. Miller, Chief Operating Reactors Branch 83 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Dear Mr. Miller:

Re: St. Lucie Unit 2 Docket No. 50-389 Condition of License 2.C.9 Barrier For Hi h Ener E ui ment The referenced license condition requires Florida Power

& Light Company to install a missile barrier around the pressurizer heater transformer located in the cable spreading area prior to startup following the first refueling outage.

Design of the barrier is required to be reviewed and approved by NRC prior to installation.

FPL submitted a conceptual design for the subject barrier by Letter L-84-44 dated February 27, 1984.

Recently, during NRC's Structural Engineering Branch's (SEB) review of the

design, questions were asked concerning the barrier design by the reviewer.

The attachment to this letter provides the formal response to NRC's questions.

This information has previously been transmitted informally to NRC via mail and telephone conversations.

Should you have any questions regarding this submittal, please contact us.

Very truly yours, J.W. Williams, Jr.

Vice President Nuclear Energy Department JWW/RJS/DCB/mp cc: J.P. O'Reilly, Director Region II Harold F. Reis, Esquire 8407020338 840627 PDR ADOCX 05000389 P

PDR PEOPLE... SERVING PEOPLE

Page 1 of 2

,ST LUCIE UNIT 2 PRESSURIZER HEATER TRANSFORHER BARRIER USNRC - SEB REQUEST FOR

'ADDITIONAL I NFORHATI ON QUESTION: What was the Ballistic Research Laboratory (BRL) formula used for7 ANSWER:

BRL formula was used to check for local penetration of the grating.

Adjustments were made to the formula to account for reduction in contact area and Poisson's ratio.

These adjustments were

required, due to differences in the characteristics of plates versus grating.

QUESTION: What were the load combinations used in evaluating the barrier2 ANSWER:

The following load combinations were considered in the design:

1)

Dead Load + Hi>sile Load 2)

Dead Load + Seismic Load QUESTION:

How was the barrier analyzed from a seismic standpoint2 ANSWER:

The seismic design of the barrier was performed as outlined below:

A frequency check of the over al I structure was performed.

The barrier was modeled as a planar portal frame with the majority of its mass concentrated at the top girder level and the balance as a distributed mass along each column.

The grating was modeled as a simple beam with a lumped mass.

The Stardyne computer program was used for the frequency check.

Results of.the frequency check:

~ 4.386 hertz for structure

~

21 hertz for grating Used "g" values from appropriate floor response spectra using 24 damping (RAB - 43.0'levation)

"g" value for 4.386 hertz is 0.70g.

1.0 g

used for design.

Page 2 of 2 Performed static equivalent analysis of structure using "g" valve noted above.

Analysis was performed by hand.

QUESTION: What missiles were assumed when designing the barrier2 ANSWER:

The attached table provides a list of missiles that were evaluated during the design of the barrier.

TABLE I POI'EÃFlAL MISSIIZS Page 1 of 2 VBKOR H%H 83 (2998"429)

WEIGHF (lbs)

VEIDCITY (fps)

IMPACT MTACIRENI'OIENPIAL

~(in )

(A~2A3)

(B 2B3)

CROlP 1 OBJECIS WI'IH TlVQECIORIES WEST KMQU) CABLE SPREADING AREA)

Airtest Valve 13 0.5 28

0. 785 Treaded A) Reactor Trip SNR (

15 feet)

B)

CEDMCS Chbinet (Non-Safety) annot escape transformer -without in@acting transformer cooling fan enclosure.

4 1/2" Flange Not Listed 0.85 390 0.85 4 Bolts (4-1/2 X 3/16 edge)

A) Reactor Trip SWGR (

15 feet)

B) CHNCS Cabinet (Non-Safety)

Cannot escape transformer without iapacting transformer cooling fan enclsoure.

GROUP 2 OBJECIS WIDOW 'IIVQECIORIES UHIRD Manhole Cbver 14 17 135 240 22 Bolts A) Tray L2321 (Non-Safety)

B) Cbnduits Near Ceiling Barrier distance chosen to prevent twisting of projectile.

Plug 0.5 141 1.23

'Ihreaded A) 'Tray L2321 (Non-Safety)

B) Cbnduits Near Ceiling Relief Valve-17 Sudden Pressure 27 Relay 20 35 10 43 43 68 28 50 24 6 Bolts 8 Bolts A) Tray L2321 (Non-Safety) or Ceiling B) Cbnduits Near Chiling A) Cbnduit Near Ceiling

')

Tray Support or Conduits Near Chiling Cbnduit attached to device.

QQUP 3 OBIECIS WI'IW 'HVQECIORIES EASF (AWAY FKM CABLE SPREADING AREA)

Drain Valve 5

23 34 13

. Ihreaded A) Cbnduit B) Electrical Box 2352

~rname ter 60 10

'Ihreaded A) PRHIR SCR Cbntroller (Non-Safety)

B) Electrical Box 2354 Conduit attached to device.

VKRXR I%M Sl (2998-429)

NEIGH1'lbs)

(fps)

NPACP (in2)

TASLE.I 87I%ÃHALNISSIMS ATIICMM'OSTERIAL

%@@El'A 2A3)

(B 283)

Page 2 o,f 2 Liquid level 8

Gage Pressure Gaqe 9

318 225 28

'Ihrceded

'Ihrceded A) Omnunication Box (Non~fety)

Chnduit attached to device Electrical Box 2875 B) Electrical Box 2851 A) PBNIR SCR Cbntroller (Non-Safety)

B) Electrical Box 2851 Tap Changer 15 10 20 75 53 Hultiple Welds A) Oxsaunications Box (Non-Safety) and/or Bolts or Electrical Box 2875 B) Electrical Box 2851 or 2354

'iheraaneter 25 130 24 4 Bolts A) PRIER SCR Cbntroller (Nm-Safety)

B) Electrical Box 2851 or 2354 2 Chnduits. attached to deVtce Brass Pitting Not Listed 1

aCap (1) 0.785

'Ihreaded A) PBBIR RR Cbntroller (Non-Safety)

B) Electrical Box 2354 Device behind cooling tubes I finsI lao probability of escape Plug (1/2')

Not Listed 0.34 (Part of Sudden Pressure Belay) 70 0.2

'Ihreaded A) PRHR SCR Controller (Rn-Safety)

B) Electrical'Box 2354