ML20039F667

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Forwards List of Estimated Quantities of Organic Matl in Facility Containment,Per Chemical Engineering Branch Request Re Potential Hydrogen Generation & Debris Quantities Resulting from LOCA
ML20039F667
Person / Time
Site: Clinton Constellation icon.png
Issue date: 01/06/1982
From: Geier J
ILLINOIS POWER CO.
To: John Miller
Office of Nuclear Reactor Regulation
References
U-0382, U-382, NUDOCS 8201130202
Download: ML20039F667 (4)


Text

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, a U-0382

/LLINOIS POWER COMPANY L30-82(01-06)-6 ff) 500 SOUTH 27TH STR:ET, DECATUR, ILUNOIS 62525 January 6, 1982 S

Mr. James R. Miller, Chief & HECENED Standardization & Special Projects Branch Division of Licensing  ! JANl'11982* t-Office of Nuclear Reactor Regulation 7/ s uusumunn snau U. S. Nuclear Regulatory Commission namn gsman n Washington, D. C. 20555 g f,

Dear Mr. Miller:

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Clinton Power Station Unit 1 Docket No. 50 - 461 Attached is the list of estimated quantities of organic materiala in the Clinton Containment, and related information, requested by F. Witt, Chemical Engineering Branch, for use in determining the potential hydrogen generation and debris quan-tities resulting from a LOCA event, and potential effects.

This information was developed to the criteria specified by F. Witt and IP considers this item closed for licensing purposes.

Sincerely',

(( M w Ji D. Geier Manager Nuclear Station Engineering cc: J. H. Williams, (NRC Clinton Project)

H. H. Livermore, (NRC Resident Inspector)

F. Witt, (Chemical Engineering Branch) cw'b me lY B201130202 820106 PDR ADOCK 05000461 PDR A I ,

'- CPS f

281.2 Indicate the total amount of protective coatings

. (6.1.2)~ and organic materials (including conduit covered

_ _ _an.d . uncovered cable unsulation) .used 'inside the '

containment that do not meet the requirements of ANSI N101.2 (1972) - and Regulatory Guide 1.54.

Evaluate the generation rates vs. time of combustible i gases that can be formed from these unqualified organic materialsLunder DBA conditions. . Also

' evaluate the amount (volume) of solid debris that can be formed from these unqualified organic

  • materials under DBA CO;.ditions that can reach the containment sump. Provide the technical basis and assumptions used for this evaluation.

REVISED RESPONSE I

The amount of unqualified organic plant in containment is esti-f mated below:

Outside Drywell,

~

Inside Drywell 2.05 ft .-36 ft The total amount of cable insulation and jacket material-

> (chlorosulfinated polyethylen?, ethlene propylene rubber, and polyolefins) in containment is given below:

f Outside Drywell Inside Drywell 225,000 lbs. 25,000 lbs .-

The total hydrogen generation rate is being investigated with

i. ' the BWR Owner's Group. It is expected that the hydrogen generation in containment study will demonstrate that the contribution to hydrogen generation from unqualified organic.

materials 1under DBA conditions will be negligible compared to other sources. The amount of corrodible materials inside the drywell'and containment is given in Table 6.2-49.

281.1-1

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u CPS It is also expected that the volume of solid debris that can be formed from unqualified organic materials in contain-ment under DBA conditions that can reach the containment sump will be minimal, since, as stated in Subsection 6.1.2.1, the only exemptions to using organic protective coatings in accordance with ANSI standards are limited to small zie equipment Celectrical/ electronic trim, covers, face plates, and valve handles) where, in case of LOCA, the paint debris would in no way be a safety hazard.

4 Solid debris form within the drywell would not reach the containment ECCS suction lines in the suppression pool but j would remain in the drywell. The only part of the suppression pool within the drywell is the annular region enclosed by the weir wall. Transport of debris to the suppression pool can be accomplished only through the vents during blowdown which occurs very early in the DBA sequence before significant formation of debris.

Solid debris formed in containment outside the drywell would not present a problem to the ECCS suction lines even if the unlikely event that all debris reached the suppression pool because of the following factors:

281.1-2

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. CPS-

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(1) the large volume of the pool (135,700 ft at low water level) .

(2) the low design inlet velocity of the suction strainers (1.9ft/sec).

(3) the location of the suction strainers at elevation 720'0" feet which is 8 feet above the floor of the pool at elevation 712'0".

(4) the suction lines are designed such that adequate NPSH and flow are available for the ECCS pumps even if the strainers are 50%

clogged.

I m a* g - e 4