ML20072F381
| ML20072F381 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 06/21/1983 |
| From: | Bradley E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8306270365 | |
| Download: ML20072F381 (6) | |
Text
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a PHILADELPHIA ELECTRIC COMPANY 23O1 M ARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 EDW ARD G. DAUER. JR.
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veCE PREseOEMT ano asumma6 counsa6 EUGENE J. 3R ADLEY assoctava ennemaL counsmL CON ALD SLANKEN CUDOLPH A. CHILLEMI E. C. KIR K H A LL T. H. M AMER CO RNELL PAUL AUERSACH assesTan? samana6 counssk June 21, 1983 EDW ARD J. CULLEN J R.
THOM AS H. MILLER, J R.
IR EN E A. McKENN A assesTaNT CoWNsEk Mr.
A.
Schwencer, Chief Licensing Branch No. 2 Division o f Licensing U.
S.
Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Limerick Generating Station, Units 1 & 2 Information Request from the Power Systems Branch File:
GOVT l-1 (FSAR)
Dear Mr. Schwencer:
Attached is a revised draft response to FSAR Question 410.70.
This draft change will be formally incorporated into the FSAR revision scheduled for July, 1983.
Sincerely, Euge J.
r 1 y JJH/gra/34 Copy to:
See Attached Service List I {
8306270365 830621 DR ADOCK 05000352 PDR
4 cc:
Judge Lawrence Brenner (w/o enclosure)
Judge Richard F. Cole Judge Peter A. Morris Troy B. Conner, Jr., Esq.
y Ann P. Hodgdon, Esq.
Mr. ' Frank R. Romano Mr. Robert L. Anthony Mr. Marvin I. Lewis Judith A. Dorsey, Esq.
Jacqueline I. Ruttenberg Thomas Y. Au, Esq.
Mr. Thomas Gerusky Director, Pennsylvania Emergency Nbnagement Agency Steven P. Hershey Charles W. Elliott, Esq.
Donald S. Bronstein, Esq.
Mr. Joseph H. White, III David Wersan, Esq.
Robert J. Sugarman, Esq.
M'rtha W. Bush, Esq.
a Atomic Safety and Licensing Appeal Board Atomic Safety and Licensing Board Panel Docket and Service Section l
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OUESTION 410.70 (Section 9.2.6)
Provide the basis for concluding that the design temperature for the ESW and RHRSW will not be. exceeded using only tornado and tornado missile protected structures, systems and components.
RESPONSE
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As described in Section.9.2.6, the ultimate heat sink at Limerick is an excavated spray pond with a surface area of 9.9 acrec.
Four spray networks, each having 50% capacity for shutdown of two units, are provided.
Details of the spray pond excavation and finished grading are shown in Figures 3.8-55,-3.8-56, and 3.8-57.
The general arrangement of the spray pond, spray networks, and spray pond pump structure is shown in Figure 9.2-6.
The layout of the spray networks is shown in Figure 9.2-7.
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uo.
As discussed in Section 3.5.1.4, all essential structures,
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i systems, and components related to the ESW system, RHRSW system,/
and the UHS are protected from the effects of tornadp;e and j
Protection of the spray networks Ws provided by location of the network piping and sprays below the surrounding grade and by physical separation of the networks:
a.
In all but the spillway area, the surrounding grade is in excess of El. 260 ft. while the top of the sprays are I
at El. 258 ft and the spray network piping is between El. 253 ft 05 in, and El. 256 ft 8 in, b.
The closest branches of adjacent spray networks are separated by 65 ft.
c.
The supply piping to adjacent networks is separated by 215 ft.
d.
The networks are located at a minimum distance of 72 ft
.from the edge of the pond.
The use of elevational differences and physical separation to provide protection of the spray pond networks from tornado missiles is justified by the following considerations:
a.
Only two spray networks are required for the safe shutdown of both units.
l b.
The only active failure that can compromise the j
operability,of a spray network is failure of its supply l
j 410.70-1 Rev. 20, 05/83 i
valve (HV-57-032A,: B, C, or D).
These valves may be manually operated to isolate damaged networks or to initiate the use of undamaged networks if their controls
-or motors are inoperable.
V c.
The physical arrangement of the spray networks precludes the possibility that large missiles can damage more than one spray network due to trajectory considerations.
tosubstantiallydamagemultiplenetworksareunlikely.hjnsdI Multiple missiles of sufficient energy and distribution
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' d.
The loss of some sprays in a network does not result in substantial loss of heat removal capability for the entire network-(each network contains 240 spray nozzles).
e.
The~ design thermal performance of the spray pond is based on conservative design values of initial pond temperature and meteorology as described in Section
~
9.2.6'.4.
For all expected conditions, the margin in thermal performance.would be considerably greater than the 10% margin demonstrated under design conditions.
I f.
Interconnections are provided that allow the use of the cooling towers as a heat sink for ESW and RHRSW systems.
Such operation-may be initiated from the control room or g
locally by manual operation.
%,'nsur1(p g.
The loss of more than two spray networks and the coincident loss of the cooling towers due to tornado missiles is unlikely due to physical separation of the 7
cooling towers-and the spray pond.
The cooling towers are located approximately 600 feet from the nearest I
portio of a spray network.
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h.
Torna o missiles are an insignificant contributor to plant risk because of the low frequency of occurrance of
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i tornadoes in this region (EROL Section 2.3.1.'2.2) and the low' likelihood of damaging missiles if one were to occur. -
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Plant procedures will address the various contingent actions available to the oper.ators to deal with degraded UHS conditions s
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ubstantial time is available for corrective operator actions.
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Rev. 20, 05/83 410.70-2
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