ML20003A969
| ML20003A969 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/21/1981 |
| From: | Hukill H METROPOLITAN EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-18, LLL-004, NUDOCS 8102100135 | |
| Download: ML20003A969 (1) | |
Text
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Yb Metropolitan Edison Company gh Post Office Box 480 Middletown, Pennsylvania 17057 717 944-4041 Writer's Direct Dial Number January 21, 1981 L1L 004 Office of Inspection & Enforcement g
Attn:
B. H. Grier, Director p
Region I g
U. S. Nuclear Regulatory Commission 8{L, 3
l 631 Park Avenue King of Prussia, Pa.
19406 3 M S O 19 8 1 ".g e.q%[N k
Dear Sir:
s Three Mile Island Nuclear Station, Unit 1 (TMI-1) C> 4
/f Operating License No. DPR-50
~
Docket No. 50-289 IE Bulletin 80-18 Our previous response (October 16, 1980, TLL 481) to the subject bulletin concerning " Maintenance of Adequate Minimum, Flow Through Centrifical Charging Pumps Following Secondary Side High Energy Line Rupture" indicated an assumed DP of 50 psi across the core.
A letter from Babcock & Wilcox on this subject stated the assumed DP was incorrect for flows of 109%
to 110% of design Reactor Coolant System flow. The revised DP should be 94.4 psi. Therefore, paragraph e of our previous letter should be revised to indicate a 300' " cushion" vice the 400' " cushion".
This change does not affect the conclusions determined previously.
Sincerely, a
.t H. D.
' kill Director, TMI-l HDH:DGM: hah cc:
R. W. Reid H. Silver D. DiIanni L. Barrett B. Snyder 8102100 Metrges& tan Edison Comssm is a Memberof the General Public Utilities Sgern