ML20062L570
| ML20062L570 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/16/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Miraglia F Office of Nuclear Reactor Regulation |
| References | |
| SBN-309, NUDOCS 8208190155 | |
| Download: ML20062L570 (5) | |
Text
PUBLIC SERVICE SEABER STATION Engineedng Office:
Companyof New Hamph 1671 Worcester Road Framingham, Massachusetts 01701 (617) - 872-8100 August 16, 1982 SBN-309 T.F. B 7.1.2 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Mr. Frank J. Miraglia, Chief Licensing Eranch No. 3 Division of Licensing
References:
(a ) Construction Permit CFPR-135 and CPFR-136, Docket Nos. 50-443 and 50-444 Sulject:
Electrical Raceway Systems; FSAR Revisions
Dear Sir:
The NRC Region I Of fice of Inspection and Enforcement has noted an ambiguity in the FSAR discussion of the seismic design basis of the Electrical Raceway (cable tray) System. We have attached revised FSAR pages which serve to clarify the actual design basis for this system.
This information will be incorporated into the FSAR in Amendment 46 which will be issued in the near future.
Please contact this of fice if additional information is required.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY w
J. DeVincentis Project Manager dad 000l cc:
Mr. R. W. Starostecki, Director D
Division of Resident and Project Inspection United States Nuclear Regulatory Commission Of fice of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, PA 19406 8208190155 820816 PDR ADOCK 05000443 A
~
SB 1 6 2 Amendmen't 45 FSAR June 1982 TABLE 3.2-1 (Sheet 4 of 5) l 49 System and Component Reference Section 2.
Onsite Power Systems a.
A.C. Power Systems 8.3.1 4160-V Switchgear (ESF Buses) 4160-V Non-segregated bus duct between ESF buses and diesel generators 4000-V and 460-V Motors (associated with ESF)
Diesel Generators Diesel Generators Control Panels 480-V Motor Control Centers (associated with ESF) 480-V Unit Substations (ESF buses) 4160-V to 480-V Trans formers (associated with ESF) 120-V Vital Panel Boards Containment Penetration Assemblies Power Cables, 5-kV and 600-V (associated with ESF)
Instrumentation and Control Cables (nuclear-safe ty-rela ted )
Emergency Power Sequencing System Electrical Supports, Fittings and Accessories (nuclear-safety-related)
Conduit and Cable Tray Raceway (see Note S )
System (nu c lea r-s a fe ty-rela te d) b.
D.C. Power Systems 8.3.2 fS' 125-V Batteries (nuc lea r-s a fe ty-rela te d)
Battery Chargers (nuc le ar-s a fe ty-rela ted) 125-VDC Switchgear (nuclear-safety-related) 125-VDC Pane 1 boards (nuclear-safety-related)
Vital Instrument Bus Pane 1 boards Inverters (vital instrument buses)
Electrical Supports, Fittings and Accessories (nuclear-s afe ty-rela ted)
NOTES 1.
These items not required as mechanical supports for CRDM housings, but are required to ensure functioning of the control rods.
2.
Any reactor vessel internal, the single failure of which could cause release of a mechanical piece having potential for direct damage (as to the vessel cladding) or flow blockage, shall be classified to a minimum of Safety Class 2 (see Subsection 3.2.2.1 for definition),
seismic Category I.
3.
Failure could cause a los s-of-coolant accident, but less than a Condition III l o s s-o f-c'oo la n t.
SB 1 & --2 Amendmsnt 45 FSAR June 1982 TABLE 3.2-1 (Sheet 5 of 5) 4.
All seismic Category I structures are founded either on sound bedrock or on engineered backfill extending to sound bedrock. The type of en-gineered backfill used beneath the foundations of all seismic Category I structures was fill concrete, except for safety-related electrical duct banks, electrical manholes and service water pipes which were founded on offsite borrow or tunnel cuttings, as shown in Table 2.5-19.
49 h Con luNb 2n/ ca)/e Slem 5 /nclullj rgeegg g(
+4eir supports, wAen used to car <g safeh re/akdcacait cables, are se/outea/& angzecias accestb/ks.7[e itens-d&
Inske air-fle suffati and cable trays are freafed as non-Safeb' relatec) s+rach<<a/ members but are parcAased as con,pne,rt wibf spec 17/lperFoemance regua-emeds-g L
& manefacturer provides substanMfinj -test data 2nd calculadions, as weEas a corEU/eate of comf ance to h4 manafacfurj sCandards 7Ne Sufforts
/i are assemflecl insta//ec/and'inspecte<;l In acconl0nce with the applicable crtherd of.40 CFR So Appendu B.
The ceb/e irays are desi ned, in sta//e/ s,,d ikispected' in accordence wat gu/etory Rsiz4,t c.7 a,,dc.f of dyulato'y Gwk f.37, /Cevision 3.
Qualificabbn of Ue condui% andcable -t for+Ae C/ ass.Le safbe relatedcacuits Sa
$eenrace g s c onfirmed by analys4, and ca/ca/abbos, ver,9iny He adeyacy of Ue syslen. base / on depryertn>s
(
of ibe receuuys (ac/udp tray a>Aere am/kshk) an</ suppet componerrts.
Y[o
- SB 162 Amendment 45 s
FSAR June 1982
[
electrical equipment will perform its function when subjected to the stipulated seismic loading conditions of the SSE.
All test reports and calculations were certified by a registered professional engineer, skilled in the applicable specialty, and by a responsible officer of the manuf acturer or vendor.
Equipment anchor loadings and details, such as size and spacing of anchor bolts or welds, were obtained from the equipment manufacturers for use in designing foundations or supporting floors for compatibility with the seismic anchor loading of the equipment.
3.10(B).3 Methods and Procedures of Analysis or Testing of Supports of Electrical Equipment and Instrumentation 3.10(B).3.1 Electrical Equipment and Instrument Supports The qualification of supports for main control boards, cabinets, panels and instrument racks, as well as supports for electrical equipment such as battery racks, was accomplished using one of the methods discussed in Subsection 3.10(B).l.
The methods used in evaluating the supports were testing under simulated conditions and analytical approaches. Analytical methods were employed for the anchorage of the supports. Amplified floor response spectra for the locations where the equipment is mounted are provided to the equipment supplier who is responsible for qualifying the equipment.
Supports for instru-ments and electric equipment are attached by bolting or welding to anchor plates fabricated of ASTM A36 steel, either embedded in the concrete with stud anchors or surface-mounted to the concrete using bolt anchors.
In either case, they were designed to prevent uplift or overturning effects due to seismic forces.
uden useUo carry safety related Scud cghS he 3.10(B).3.2 Cp le Tray Supports J
y
[aceway systems g designed to withstand the seismic forces which would be experienced during a SSE due to the weight of 6 Cable tray load-deflection curves were used to formulate a l
simplified analytical model of the tray which was then coupled to the analytical l
model of the supports. The response spectra method was used to analyze the overall analytical model and to design the support structures, while complying with the tray support system functional requirement.
The cable tray support system was analyzed for dead load combined with the OBE loads, with the stress criteria based on the allowable stresses of the AISC Specification on Structural Steel for Buildings and the engineering i
i information for strut members published by Unistrut, Powerstrut or Superstrut.
l For dead loads combined with SSE loads, the stresses are limited to 90 percent I
of yield stress for the material involved.
For the seismic loads, the actual natural frequency response of each support system was calculated and the appropriate seismic acceleration factor was selected f rom the amplified floor response spectra (see Section 3.7).
The cable tray supports consist of structural shapes and strut members.
l 3.10(B)-3 1
i
-n v
.[
Q TABLE 3.10(B)-1
(
SEISMIC QUALIFICATION METHOD
SUMMARY
OF INSTRUMENTATION AND ELECTRICAL EQUIPMENT CONTRACT NO.
EQUIPMENT DESCRIPTION VENDOR QUALIFICATION METHOD
- REMARKS 109-1 Cable Trays Metal Products Static Test and Analysis **
118-1 Penetrations Westinghouse Randon Frequency Test and Analysis 119-3 Emergency Power Sequencers Vitro Lab Randon Frequency Test Acton Lab 119-5 D.C. Switchboards Gould-Brown Boveri (Later) 120-1 Power Distribution Panels Gould-Brown Boveri.
(Later) 120-9 R.C.P. Fuse Cabinets (Later)
(Later) 129-1 Misc. Control Panel (Later)
(Later) 137-1 Storage Batteries Gould Randon Frequency Test 137-2 Battery Charger Power Conversion Products Random Frequency Test Wyle Lab 143-1 480V Motor Control Center Gould-Brown Boveri Random Frequency Test 144-1 SKV Non-Seg. Phase Bus Duct Gould-Brown Boveri Static and Dynamic Analysis 145-2 5KV Switchgear Gould-Brown Boveri Random Frequency Test Wyle Lab 145-3 480V Unit Substation Gould-Brown Boveri Random Frequency Test Wyle Lab y
170-1 Main Control Board & Accessories York Dynamic Analysis & Test Analytical Eng./
y Wyle Lab 170-4 Recorders Foxboro Random Frequency Test Southwest Research N
Inst.
170-5 Panel Mounted Indicators Sigma Random Frequency Test Acton Lab 170-6 Thermocouples & Wells Thermoelectric / Dravo (Later) 171-1 Instrumentation Racks Mercury Dynamic Analysis & Test Acton Lab 172-1 Radiation monitors General Atomic (Later) 173-1 Main Steam Atm. Relief Valve B&W Control Components Static Analysis 173-4 Soi..oid Valves (Later)
(Later) 173-5 Nuclear control valves Masoneilan (Later) 174-2 Electronic Controllers and West / Industry System Div.
(Later)
Accessories 174-8 Electronic Transmitters
' West /VeriTrak (Later) 252-3 Flow Elements BIF (Later) 252-6 Rotameters Schutte & Koerting (Later) 252-8 Thermal Elements & Wells Thermoelectric / Dravo (Later) 252-16 Differential Pressure Switches ITT Barton (Later) 252-19 Seismic Monitoring System Kinemetrics (Later) 252-30 Loose Parts Monitoring (Later)
(Later) 301-1 Hydrogen Analyzer Consip/ Delhi (Later)
- Methods shown were used to qualify equipment. Equipment qualified by analysis and testing meet criteria of Section 3.10(B).1.
- See Section 3.10(B,).3.
and Dh/t J. 2 d