ML19324B852
| ML19324B852 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/01/1989 |
| From: | Hernan R Office of Nuclear Reactor Regulation |
| To: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| References | |
| TAC-75103, NUDOCS 8911080413 | |
| Download: ML19324B852 (3) | |
Text
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~ v November i,1989
,0bcket No. 50-289 r
Mr, Henry D. Hukill, Vice President.
and Director TMI-1 GPU Nuclear Corporation P. 0. Box 480 Middletown, Pennsylvania 17057
Dear Mr. Hukill:
[
SUBJECT:
. REQUEST FOR ADDITIONAL INFORMATION (TAC NO. 75103)
The staff is reviewing your Technical Specification Cnange Request (TSCR) No.
196 and requires the following information to complete this review:
1 s
.1
- 1. s Oneoftheproposedchangeswouldincreasetheposjgivelimitofthemode-( j.
rator temperature coefficient (MTC) from +0.5 X 10 to +0.9 x 10 delta-e
'k/k/*F.
Although the existing FSAR Chapter 14 accident analysis accep,t-
~
ance criteria and margins of safety would still be maintained with the proposed MTC increase, the staff has.previously expressed'its concerns
,'4 regarding trends in current reload designs that may lead to initial:MTCs F
g, that may be less conservative than were assumed for ATWS analyses.
Ins ii view of this, discuss the impact of the proposed MTC increase,on the B&_W/;
z y'
n.
BWOG generic ATWS assumptions.
i
..;2.
Although thermal-hydraulic stability has not been considered a serious g
3..
p
- 4 problem in PWRs in the past, a more positive MTC is in the direction of instabilities and may become a concern.
Discuss any adverse impact of the larger positive MTC on the hydraulic stability of the TMI-1 core.
.q 1,
).
3.
How does the larger positive MTC affect the neutronic stability of the core?
Please contact me if you have any questions.
i 1
The reporting and/or recordkeeping requirements contained in this letter affect fewer than 10 respondents; therefore, OMB clearance is not required under P.L.96-511.
I Sincerely
/s/
Ronald W. Hernan, Senior Project 8
Manager h050891201 Project Directorate I-4 P
P 9
ogol Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
, c 1
cc:
See next page l
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.3.---------.------------.-g///89 DATE$l0/
.0///89
/ /89 0FFICIAL RECORD COPY Document Name:
LETTER FOR DOCKET NO. 50289 1
c Mr. Henry O. Hukill Three Mile Island Nucleer Station, GPU Nuclear Corporation Unit No. 1 l
cc:
G. Broughton Francis I. Young i
08M Director, TMl-1 SeniorResidentInspector(TMI-1)
GPU Nuclear Corporation U.S.N.R.C.
Post Office Box 480 Post Office Box 311 Middletown, Pennsylvania 17057 Middletown, Pennsylvania 17057 Richard J. McGocy i
Manager, PWR Licensing Regional Administrator, Region I GPU l'uclear Corporation U.S. Nuclear Regulatory Commission 100 Intcrpace Parkway 475 Allendale Road Parsippany, New Jersey 07054 King of Prussia, Pernsylvania 19406 C. W. Smyth Robert B. Borsum TM1-1 Licensing Manager Babcock & Wilcox GPU Nuclear Corporation Nuclear Power Generation Division Post Office Box 480 Suite 525 Middletown, Pennsylvania 17057 1700 Rockville Pike Rockville, Maryland 20852 Ernest L. Blake, Jr., Esq.
Governor's Office of State Planning Shaw, Pittman, Potts & Trowbridge and Development 2300 H Street, N.W.
ATTN: Coordinator, Pennsylvania Washington, D.C.
20037 State Clearinghcuse Post Office Box 1323 Harrisburg, Pennsylvenia 17120 Sally S. Klein, Ctsirman Thonias M. Gerusky, Director 1
Dauphin County Comissioner Bureau of Radiation Protection 3
Dauphin County Courthouse Pennsylvania Department of Front and l'arket Streets Environrental Resources Harrisburg, Pennsylvania 17120 Post Office Box 2063 Harrisburg, Pennsylvania 17120 Kenneth E. Witmer, Chairman Coard of Supervisors c
of Londonderry Township 25 Roslyn Road Eilzabethtown, PA 17022
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