Document: NUREG-0800
Document ID: 2a17c8b4-9af9-4741-8f80-b8bd35fd9fc3
Document Type: srp
Title: PROTECTIVE COATING SYSTEMS (PAINTS) - ORGANIC MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600399.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.1.2
CFR Part: 
CFR Title: 

Content:
est data on specific coating systems and organic materials, the data in Reference 5 may be used to estimate the rates of hydrogen formation from zinc primers and from zinc primers plus topcoats. Cable insulation is assumed to generate hydrogen by radiolysis with a yield comparable to that of polyethylene. Unqualified paints (organic or inorganic), those that do not meet the acceptance criteria of this Standard Review Plan section, are assumed to form solid debris under DBA conditions. Unqualified paints that contain only organic materials and that do not meet the acceptance criteria of this Standard Review Plan section, are assumed to generate hydrogen by radiolytic decomposition with a yield comparable to that of organic polymers. If combustible gases such as hydrogen and methane can be generated, the reviewer notifies the appropriate reviewer if this source is not included in Section 6.2.5 of the SAR. If a system to control combustible vapors is not provided, then the release of volatile alkanes to form organic iodides is of additional concern. The yield of organic iodides relative to the total iodine released after a DBA is estimated using the data of Reference 7 and any applicable experimental results submitted by the applicant. The appropriate interfacing reviewer should be notified of the estimated organic iodide formation. 6.1.2-5 Revision 3 - March 2007 If solid debris can be produced, the interfacing reviewer responsible for solid debris should be notified of the quantity of debris that can result from decomposition of unqualified materials. The interfacing reviews should determine the effects of the debris on operation of post accident fluid systems. Any exception to Regulatory Guide 1.54 involving quality assurance and quality control requirements should be referred to the appropriate interfacing reviewer for review and resolution. Adverse interactions, if any, under DBA conditions, between the potential decomposition products, namely hydrogen and solid