ML20070H883
| ML20070H883 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 12/21/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| SBN-408, NUDOCS 8212270270 | |
| Download: ML20070H883 (2) | |
Text
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1 l
PUEBLIC BERVICE sua sum M.:i.,, Offke:
Companyof New Hempehre 1671 Worcester Road f
Framinoham Massachusetts 01731 (617) - 872 8100 I
l December 21, 1982 SBN-408 T.F. B7.1.2 I
i United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Mr. George W. Knighton, Chief Licensing Branch No. 3 l
Division of Licensing i
References:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) PSNH Letter, dated December 8,1982, "Open Item Response; (SRP 4.2; Containment Systems Branch)," J. DeVincentis to C. W. Knighton f
Subject:
Revised Open Item Response; (SRP 4.2; Core Performance Branch)
Dear Sir:
Tn response to an open item identified by Mr. Dale Powers of the NRC Core Performance Branch, we submitted, in Reference (b), a revised FSAR Section 3.2.2.3.a.
We have again revised FSAR Section 4.2.2.3.a as delineated on the attached annotated page (P4.2 '4).
The enclosed revision to FSAR Section 4.2.2.3.a vill be included in OL Application Amendment 48.
Very truly yours, j
YANKEE ATOMIC ELECTRIC COMFANY
[J.DeVincentis l
i Project Mannzer ALL/fsf
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cc: Atomic Safety Licensing Board I
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~8212270270 8212P1 PDR ADOCK 05000443
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Fuel depletion and fission product buildup.
l a.
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b.
Cold to hot, zero power reactivity change.
c.
Reactivity change produced by intermediate term fission products such as xenon and samarium.
d.
Burnable poison depletion.
The chemical and volume control system is discussed in Chapter 9.
The rod cluster control assemblies provide reactivity control for:
a.
Shutdown.
b.
Reactivity changes resulting from coolant temperatore changes in the power range.
Reactivity changes associated with the power coefficient of c.
reactivity.
d.
Reactivity changes resulting from void formation.
Figure 4.2-8 illustrates the rod cluster control and control rod drive mechanism assembly, in addition to the arrangement of these components in
(
the reactor relative to the interfacing fuel assembly and guide tubes.
In the following paragraphs, each reactivity control component is described in detail. The control rod drive mechanism assembly is described in Subsection 3.9(N).4.
The neutron source assemblies provide a means of monitoring the core during periods of low neutron level. The thimble plug assemblies limit bypass flow through those fuel assembly thimbles which do not contain control rods, burnable poison rods, or neutron source rods.
a.
Rod Cluster Control Assembly The rod cluster control assemblies are divided into two categories:
control and shutdown. The contral groups compensate for reactivity changes associated witn variations in operating conditions of the reactor, i.e.,
power and temperature variations. Two nuclear design criteria have been empisjed for selection of the control group.
First the total reactivity worth must be 9dequate to meet the nuclear requirements of the reactor. Seccad, in view of the fact that these rods me.y be prtictly insert ed at power operation, the total power peaking factor should be lou enough to ensure that the power capability is met.
The control and snutdown group provides adequate shutdown margin as verified by performkg rd word measurement) at 4he Rrst resiset after wch tepue/kg.
p
__t 4.2-14 s
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