ML19312D169

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Forwards Request for Changes to Tech Specs Re drywell- Suppression Chamber Differential Pressure.Refueling Outage to Be Concluded 800515.Tech Spec Changes Requested Prior to 800501
ML19312D169
Person / Time
Site: Cooper Entergy icon.png
Issue date: 03/17/1980
From: Pilant J
NEBRASKA PUBLIC POWER DISTRICT
To: Ippolito T
Office of Nuclear Reactor Regulation
Shared Package
ML19312D170 List:
References
NUDOCS 8003210380
Download: ML19312D169 (3)


Text

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gg .-d LQA8000203 GENERAL OFrtCE

. Nebraska Public Power District

--- . m

"" MA'SUMUA"^ ""'

_. m _ _ m _ ._ _ _ ._ w March 17,1980

-Director, Nuclear Reactor Regulation Attn: Mr. Thomas A. Ippolito, Chief Operating Reactors Branch No. 3 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Drywell-Suppression Chamber Differential Pressure Technical Specification Change Request Cooper Nuclear Station NRC Docket No. 50-298, DPR-46

Reference:

1) Letter from J. Pilant to T. Ippolito Dated February 8,1980, " Reload Licensing Submittal, Reload 5, Cycle 6"

Dear Mr. Ippolito:

Reference 1 transmitted a request for various Technical Specification changes resulting from work being performed during

- the present refueling outage at Cooper Nuclear Station. A summary of the major Mark I Containment Program modifications which were being planned at that time was also submitted for NRC information. It has been determined .that Item 2.g of this summary,_ truncation of the downcomers, will require a change in the Technical Specification value for Drywell-Suppression Chamber Differential Pressure. Accordingly, this request to amend the-Technical Specification changes'of Reference 1 is submitted.

The current maximum downcomer submergence at torus high water level is 4'-4'3". With the current Technical Specification pressure differential of 1.47 psi, the resulting slug of water remaining in the downcomer is 0.91 feet of water (at torus high water level).

After truncation of the downcomer during the arcsent refueling outage, the maximum downcomer submergence wl;l be 3'-4". If the current pressure differential of_1.47 psi is maintained after the outage,L constant bubbling of nitrogen / oxygen into the suppression pool will result since a pressure _ differential of 1.47 psi will displace' 3'-5'3" _ of water. Since such a condition cannot be accepted for ~ operation, _ the Technical Specification pressure differential of 1.47 psi must be reduced; therefore, Nebraska Public Power District requests that Technical Specification 3.7.E.1

~

.be revised to a value of 1.1 psi as reflected in the modified pages

- attached . . This reduced pressure differential will prevent venting.

to the suppression pool and result in a downcomer water slug

-length at high water level after the modification of 0.79 feet. This length is slightly less _ than that which currently exists

-(0.79 .vs. 0.91 ft.) and will result in a greater factor. of. safety for this. type of loading. fl ge4 t

~

u -8003210'3 90 b

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Mr. Thomas A. 'Ippolito.

March 17,1980

~. Page 2 The - presen't . refueling ' outage . is . currently. expected to be' concluded approximately ;May 15, 1980; therefore, as stated in.

Reference 1 approval of all outage related' Technical Specification changes are respectfully requested prior to May 1,1980.

Should you have any questions or require additional information, please do not hesitate to contact me.

In addition to three signed originals, 37 copies are also submitted.

Sincerely yours, M

Jay . Pflant Director of Licensing

-and Quality Assurance

. IMP /JDW: bas 17/1 Enclosure l

h.6

Mr'.~ Thomas A. Ippolito March .17, .1980 ~

- Page 3

~ STATE OF NEBRASKA )

).ss PLATTE COUNTY ).

Jay ~M. Pilant,. being first duly sworn, deposes and says that he is an authorized representat_ive ~ of the - Nebraska Public Power District, a public _ corporation and political subdivision of the State of Nebraska; that he is duly authorized to submit this information on behalf of Nebraska. Public Power ~ District; and that the statements in said application are true to the best of his knowledge

. and belief. -

Je ~ b Subscribed in my presence and sworn to before me this /[ay of

~

March , 1980.-

~

L My Commission expires b / /((d .

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