ML19262A081
| ML19262A081 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 10/19/1979 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Rubenstein L Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910260313 | |
| Download: ML19262A081 (2) | |
Text
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TINNESSIE VALLEY AUTuC.:rY cs u o.ccoa. rr w.rssrs r :ct 400 Chestnut Street Tower II October 19, 1979 Director of Nuclear Reactor Regulation Attention:
Mr. L. S. Rubenstein, Acting Chief Light Water Reactors Branch No. 4 Division of Project Management U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Rubenstein:
In the Matter of t'e Application of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 Enclosed is TVA's response to the Reactor Systems Branch question (item 212.116) on containment sump penetrations transmitted by your letter to H. G. Parris dated August 21, 1979.
This response will be incorporated into the Sequoyah Nuclear Plant Final Safety Analysis Report by Amendment 63.
Titis response, in conjunction with the responses submitted by our letters dated October 2, 1979 (LOCA Analysis), and October 12, 1979 (Check Valve Leak Testing), constitute a complete response to your August 21, 1979, letter.
If you have any questions, please get in touch with D. L. Lambert at FTS 854-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY Y?
L. M. Mills, Manager Nuclear Regulation and Safety Enclosure
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ENCLOSURE
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RESPONSE TO ITEM 212.116 0F L. S. RUBESSTEIN'S LETTER 10 H. G. PARRIS DATED \\UGUST 21, 1979 6.66 Reactor Systems Branch The applicant has based his demonstration of adequate containment sump performance on a 13-foot minimum water level inside contain-ment following a postulated LOCA.
A=endment 61 of the FSAR states that all crane wall penetrations up to elevation 693 will be scaled prior to plant operation and provided properties of the sealing material which would be used.
The staff will require assurance that all crane wall penetrations below elevation 693 have been provided with a watertight seal.
The applicant will propose a method (e.g., a test) to determine that each penetra-tion is watertight; these tests will be considered as part of the startup test program.
If the applicant does not wish to water test each penetration, the staff may accept air tests if the applicant shows them to be adequate.
If air tests arc used, the applicant will be required to perform laboratory tests of a typical penetration, showing that the sealing method is suf-ficient for the expected water temperatures and pressure differentials.
Response
Hydrostatic leakage tests using water are being performed in a test facility on representative " worst condition" penetrations.
Test models were constructed with sleeves, process lines, and seal materials identical to those installed in the plant.
(Our response to question 6.61 describes these seal materials.) The seals tested are those designed for penetrations having the largest sleeve diameter and smallest process line.
The inspection of the installed seals and the hydrostatic tests will be completed and the results documented before startup of unit 1.
Results of the inspection and tests will be available for review by the NRC.
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