Document: NRC Regulatory Guide
Document ID: c0dbb594-6262-4b83-96b1-366758ad9676
Document Type: regulatory_guide
Title: Interim Licensing policy on as low as Practicable for Gaseous Radiodine Releases from Light-Water-Cooled Nuclear Power Reactors (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1229/ML12298A137.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.42
CFR Part: 
CFR Title: 

Content:
onstruct an LWR has proposed baseline in-plant control measures-4/ to reduce the possible sources of radioactive iodine releases and the calculated annual quantities,taking into account such con- trol measuresexceed the design objective quantities set forth in C.l.a and C.l.b, the requirements for design objectives for radioactive iodine in gaseous effluents may be deemed to have been met provided the calculated annual total quantity of all radioactive iodine that may be released in gaseous effluents does not exceed four times the quantity calculated pursuant to C.l.a. (See C.2 for limiting conditions for operation.) 2. Guidance on Technical Specifications for Limiting Conditions of Operation. The guidance on limiting conditions of operation for light-water-cooled nuclear power reactors (LWRs) set forth below may be used by an applicant for a license to operate an LWR as guidance in developing technical specifications under §50.36a(a) to keep levels of radioactive iodine in gaseous effluents to unrestricted areas as low as practicable. Paragraph 50.36a(b) provides that licensees be guided by certain considerations in establishing and implementing operating procedures specified in technical specifications that take into account the need for opera- ting flexibility and at the same time assure that the licensee --/Such in-plant control measures may include treatment of steam generator blowdown tank exhaust, clean steam supplies for turbine gland seals, condenser vacuum systems, containment purging exhaust and ventilation exhaust systems, and special design features to reduce contaminated steam and liquid leakage from valves and other sources such as sumps and tanks, as appropriate for the type of reactor. " O 1.42-4 will exert his best effort to keep levels of radioactive iodine in gaseous effluents as low as practicable. The following paragraphs provide additional specific guidance to licensees in this respect. In using the guidance provided in this section, it is