ML19210B148
| ML19210B148 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/27/1975 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | Lear G Office of Nuclear Reactor Regulation |
| References | |
| GQL-1094, NUDOCS 7911040079 | |
| Download: ML19210B148 (4) | |
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NRL- 'STRIGUTION FOR PART 50 000
.T MATERI AL (TEMPORARY FORM)
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- D CONTROL NO: 6993 Jw3
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FROM: Metropolitan Edison co DATE OF COC DATE REC'D LTR TWX RPT OTHER Reading, Pa R C Arnold 5-27-75 6-2-75 XXX TO:
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_ SENT AEC POR YY y one signed SENT t.OCAL PDR XX Mr Lear CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:
XXXXXX 1
50-289 DESCRIPTION:
ENCLOSURES:
Ltr re their 4-19-75 ler.... furnish'ng,
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pQNOT REMOVE mission of material conc.erning alternate flow path so as to assure that boron precipitation would not compromise IDCA
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.JUN2 1975 ds!
Mr. George Lear, Chief j-Operating Reactors Branch 3 it
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Division of Reactor Licensing Rc.: '. )-
U. S. Nuclear Regulatory Cor: mission g[ Q h Washington, D. C.
20555 j'
Dear Mr. Lear:
Three Mile Island Nuclear Station Unit I (TMI-1)
Docket No. 50-289 Operating License No. DPR-50 In our letter (GQL 0954) of April 19, 1975, we stated that we would submit (1) A schedule for the completion of equipment modifications necessary to provide an/ alternate flow path so as to assure that boron pre-cipitation would not compromise long-tern core cooling capability following a loss-of-coolant accident (IDCA), and (2) Appropriate abstracts of associated procedures or procedure re-visions.
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With regard to Item Number (1), the schedule given belov vill be instit g N
upon receipt of NRC approval, g
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Time Action 6
393 21975P p,
M Approval of proposed actions u.5. %L,se, 7 N q.
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2 months Final detailed equipment design and associated procedur'
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review and modification m g \\ o' 1 month Final design review by Corporate Technical Support Staff and Station Operating Staff 9-12 months Equipment procurement 1-2 months Equipment installation. As installation of some equipment could be outage-dependent, this action vill depend heavily on early re-ceipt of required materials so that preliminary work may be accom-plished during scheduled outages.
1506 345 Ec33
Mr. G. Lear 2
NRC
- Date contingent upon NRC review / approval of our proposed actions as out-lined in our letter of April 19, 1975 With regard to Item Nu=ber (2), the TMI-1 operating and emergency procedures were reviewed and changes are being made to Operating Procedure 110h h - Decay Heat Removal System, and Emergency Procedure 1202 Loss of Reactor / Reactor Coolant Pressure. An abstract of these procedure revisions is given as Attach-
=ent 1.
The procedure revisions have been approved by the TMI-1 Plant Operations Review Committee and have been signed by the Station Superintendent. A copy of the revisions is available at the TMI-1 site.
We trust that we have adequately addressed any of the concerns that you may have had regarding the subject areas; however, should there be any additional questions or concerns, please contact me.
Sincerely,
/2?
L R. C.
old Vice President RCA:RSB:eg File T.T.h.1.1/20.1.1 i 536 346 O
ATTACHMENT I Metropolitan Edison Company Three Mile Island Nuclear Station Unit I (TMI-1)
R. C. Arnold to G. Lear May 27, 1975 ABSTRACT OF REVISION TO OPERATING PROCEDURE 110h h A new section-h.3.5, Long-Term Core Circulation Modes to Prevent Boron Concentration Effects -has been added. The procedure describes the necessary actions to implement each of the following modes of circula-tion.
Mode 1 Forced Circulation Using Decay Heat Drop Line Mode 2 - Gravity Draining Reactor Coolant Hot Leg to the Reactor Building Sump Via the Decay Heat Drop Line Mode 3 - Hot Leg Injection Using Pressurizer Auxiliary Spray Line (Not yet available, pending system design change)
Mode 4 - Reverse Flow Through the Decay Heat Drop Line into "B" Reactor Coolant Loop Hot Leg ABSTRACT OF REVISION TO EMERGENCY PROCEDURE 1202-6 A new requirement has been added requiring that a long-term cooling cir-culation mode be established per OP 110h-h.
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