ML19210B148

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Submits Schedule for Equipment Mods to Provide Alternate Flow Path to Prevent Boron Precipation from Compromise of long-term Core Cooling Following Loca.Also Forwards Abstracts of Associated Procedures or Procedure Revisions
ML19210B148
Person / Time
Site: Three Mile Island Constellation icon.png
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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~~ l NRL- 'STRIGUTION FOR PART 50 000 .T MATERI AL (TEMPORARY FORM)

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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: - l ORIG CC OTHER _ SENT AEC POR YY Mr Lear y one signed XX SENT t.OCAL PDR CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

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1 50-289 DESCRIPTION: ENCLOSURES: ~ '

Ltr re their 4-19-75 ler.... furnish'ng, i info with regard to the scheduled sub- '

mission of material conc.erning alternate flow path so as to assure that boron -

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precipitation would not compromise IDCA -

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May 27, 1975

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Mr. George Lear, Chief Operating Reactors Branch 3 ETPizE C0g 'd it

.JUN2 1975

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Division of Reactor Licensing -

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U. S. Nuclear Regulatory Cor: mission Washington, D. C. 20555 g[ Q he'N/

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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 ,

  • Approval of proposed actions -

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2 months Final detailed equipment design and associated procedur' **'5""**

<q review and modification

'g,/i m g \M,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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