ML20204G589

Comments on Gas & Solid Debris Formation from Zinc,Aluminum & Organic Matls Inside Containment Under DBA Conditions. Paints Not Meeting Provisions of Reg Guide 1.54 Can Be Sources of Hydrogen Generation & Debris Formation

ML20204G589
Person / Time
Site:	Diablo Canyon
Issue date:	02/27/1984
From:	Benaroya V Office of Nuclear Reactor Regulation
To:	Butler W, Sheron B Office of Nuclear Reactor Regulation
Shared Package
ML17325B782	List: IA-84-741, Forwards Inputs to Sser 24,including Staff Evaluation of 840202 Petition Filed by Govt Accountability Project Inst for Policy Studies & Updated Info on Allegations 39 & 45. SALP Input Encl ML20204G482 ML20204G589 ML20204G603 ML20204G606 ML20204G646 ML20204G660 ML20204G695 ML20204G701 ML20207S747 ML20207S758 ML20207S787 ML20207S803 ML20207S831 ML20207S840 ML20207S856 ML20207S871 ML20207S884 ML20244D033
References
FOIA-84-741, FOIA-84-742, RTR-NUREG-0588, RTR-NUREG-588, RTR-REGGD-01.054, RTR-REGGD-1.054 NUDOCS 8403050287
Download: ML20204G589 (4)

Text

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FEB 2 71984

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MEMORANDUM FOR: Walter R. Butler, Chief Containment Systems Branch Division of Systems Integration Brian Sheron, Chief Reactor Systems Branch Division of Systems Integration FROM: Victor Benaroya, Chief Chemical Engineering Branch Division of Engineering

SUBJECT:

ESTIMATE OF GAS AND SOLID DEBRIS FORMATION FROM ZINC, ALUMINUM, AND ORGANIC MATERIALS INSIDE CONTAINMENT UNDER DBA CONDITIONS FOR DIABLO CANYON, UNITS 1 AND 2 -

We have evaluated the Diablo Canyon Allegation 100, Diablo Canyon Painters Have No Quality Control Program, from the hydrogen generation and debris formation point of view.

We consider that inside containment, unqualified paints which do not meet the provisions of Regulatory Guide 1.54, Quality Assurance Requirements for Protective Coatings Applied to Water-Cooled Nuclear Power Plants (June 1973), and ANSI N 101.2, Protective Coatings (Paints) for Light Water Nuclear Reactor Containment Facilities (1972), can be a source of hydrogen generation and debris formation. This is a conservative assumption because all unqualified paints would not be affected.

In Table I, we listed the amount of hydrogen expected to be generated from the corrosion of zinc paints, galvanized steel, and aluminum. Table II lists the calculated volume of debris that could be formed.

In our evaluation, the calculation of combustible gas generation rates is consistent with the guidelines of NUREG-0588, with adjustments, to take into account the plant-specific parameters and the effects of post-accident recirculation of sump water inside the containment. We assumed that the cable insulation materials and unqualified paints (paints that do not meet the acceptance criteria of SRP Section 6.1.2) contribute to combustible gas generation,-whereas qualified organic paints (paints that meet the acceptance criteria of SRP .Section 6.1.2) and other organic materials (charcoal and oil) contribute negligible amounts of combustible gases.

For solid debris formation, we assumed that only unqualified paints form debris under DBA conditions, whereas the qualified paints, charcoal, oil, and cable insulation materials are not expected to form solid debris that can potentially reach the sumps under DBA conditions. With regards to the rate of formation and size distribution of the debris, we are unable to provide quantitative information due to uncertainty in the chemical composition and in the quality control of the application of the unqualified paints.

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s FEB 2 71984 Discussions with Carboline, one of the principal suppliers of containment protective coatings, indicated that debris from a failed unqualified coating is likely to be small in particle size. Inorganic and organic zinc coatings are predominately zinc particles and any debris released would be in the form of a white powder. Organic coatings will fail by blistering forming a flaky debris. The particle size of these flakes may range from one millimeter to 6 millimeters, and rarely up to 12 millimeters. The possibility of peeling or delamination of large sheets of protective coating is unlikely. Application of a protective coating on an oily surface could lead to delamination or peeling.

The amount of debris which can be generated from unqualified paint may total 6400 pounds with a volume of 34 cubic feet. Paint which has been qualified for suitability under design basis accident conditions (meets ANSI 101.2) is not expected to blister. Approximately 330,000 square feet of partially qualified paint has been applied inside containment without Regulatory Guide 1.54 quality control requirements. This paint may to some extent delaminate and separate from the containment surface.

The licensee provided information on the amount of qualified and unqualified protective coatings, but no information was provided on the amount of cable insulation. We used the estimated generation rates of hydrogen for the Grand Gulf plant, since Grand Gulf possesses the largest quantity of organic material that can produce gases under DBA conditions.

(

Victor Be Chemical Engineerirg Branch .

Division of Engineering

Enclosures:

As stated

Contact:

F. Witt x28360 cc: R. Vollmer W. Johnston L. Rubenstein J. Shapaker C. *1cCracken T 48TerJ1pgl8 G. Knighton A. Serkiz J. Pulsipher F. Witt E. Sullivan S. Pawlicki .

5

. Table I --

Estimated Combustible Gas Generation Rates Inside Containment Time ft.3(STP)/ min. Hydrogen Generation Radiolysis Corrosion Cable Unqualified Zinc Galvanized Aluminum Total Insulation Paints Paints Steel 1 hr 12.82 1.27 3.73 2.75 1.24 19.06 12 hr 2.65 0.56 0.62 0.46 0.21 4.50 1 day 1.52 0.40 0.37 0.27 0.13 2.69 4 day 0.58 0.20 0.23 0.16 0.08 1.25 10 day 0.32 0.13 0.23 0.16 0.08 0.92 30 day 0.10 0.07 0.23 0.16 0.08 0.64 Assumptions: (1) Source term of NUREG-0588 adjusted for plant-specific parameters and effects of post-accident recirculation of sump water.

(2) Cable insulation materials and unqualified paints received 100% airborne and plate-out gamma and 50% airborne and plate'out beta radiation.

(3) G value for cable insulation materials = 3.1 molecules /

100 e.v. absorbed. G value for unqualified paints

= 5.0 molecules /100 e.v. absorbed.

(4) All gases generated are combustible.

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, . .... Table II -

Debris Formation from Unqualified Paint 9 film thickness 1-6 mils E

debris density 1.2 - 2.1 gms/cc debris volume 34 cu. ft. Protective coatings which do not meet ANSI 101.2, Protective Coatings (Paints) for Light Water Nuclear Reactor Containment-Facilities and Reg. Guide 1.54. Quality Assurance Requirements for Protective Coatings Applied to Water - Cooled Nuclear Power Plants.

Assumptions: (1) Source term of NUREG-0588 adjusted for plant-specific parameters and effects of post-accident recirculation of sump water.

(2) Ratio of debris volume to original volume of unqualified paints = 2. i (3) :olid debris formation completed.when 90% of radiation

. energy is released.

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