ML20204G646
| ML20204G646 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 05/18/1984 |
| From: | Benaroya V Office of Nuclear Reactor Regulation |
| To: | Butler W, Sheron B Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17325B782 | List:
|
| References | |
| FOIA-84-741, FOIA-84-742 NUDOCS 8405290424 | |
| Download: ML20204G646 (2) | |
Text
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UNITED STATES
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IM NUCLEAR REGULATORY COMMISSION Jffg/Y< g W ASHINGTON, D. C. 20555
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l MAY f 81984 MEMORANDUM FOR:
Walter R. Butler, Chief
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l Containment Systems Branch
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l Division of Systems Integration F
Brian Sheron, Chief Reactor Systems Branch Division of Systems Integration FROM:
Victor Benaroya, Chief Chemical Engineering Branch Division of Engineering
SUBJECT:
ESTIMATE OF SOLID DEBRIS FORMATION FROM UNQUALIFIED PAINTS INSIDE CONTAINMENT UNDER DBA CONDITIONS FOR DIABLO CANYON, UNITS 1 AND 2
Reference:
Memo, Victor Benaroya to Walter Butler, February 27, 1984 We have reevaluated our estimate of solid debris formation from unqual'ified paints inside containment on the basis of the licensee's response, by letter dated May 9, 1984.
The amount of debris which can be generated from unqualified paint is estimated at 500 pounds with a volume of about 3 cubic feet.
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 (aune 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.
Our initial estimate (see reference memo), concluded that the debris from unqualified paint may total 6400 pounds with a volume of 34 cubic feet.
In the licensee's letter, dated May 9, 1984, additional paints were identified which have been tested in accordance with and meet the requirements of ANSI N101.2, Protective Coatings (Paints) for Light Water Nuclear Reactor Containment Facilities' (1972).
Some additional unqualified paints have been removed from the estimate because they are covered with thermal insulation and will be trapped behind the insulation, thus, preventing transport to the sump.
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Walter Butler /Orian Sheron The quality assurance control program instituted by the licensee for the qualified paints inside containment are comparable to the guidance provided by Regulatory Guide 1.54, Quality Assurance Requirements for Protective Coatings Applied to Water-Cooled Nuclear Power Plants.
About 90% of the coatings have been in place since early 1977.
The plant layup environment could be more severe than an operating environment due to condensation.
However, the qualified paints on the containment surfaces shows no evidence of chiping, flaking, holidays, bubbling or other indications of defective materials or improper application.
The consequence of solid debris that can potentially be formed from unqualified paints are reviewed in SRP Section 6.2.2.
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Victor Benaroya, Chilef Chemical Engineering Branch Division of Engineering
Contact:
F. Witt x28360 cc:
R. Vollmer W. Johnston L. Rubenstein J. Shapaker C. McCracken H. Schierling TKnightonw A. Serkiz J. Pulsipher F. Witt E. Sullivan S. Pawlicki e
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