ML12298A118
| ML12298A118 | |
| Person / Time | |
|---|---|
| Issue date: | 02/17/1972 |
| From: | Office of Nuclear Regulatory Research, US Atomic Energy Commission (AEC) |
| To: | |
| References | |
| SG 0011 | |
| Download: ML12298A118 (1) | |
Text
2/17/72 SUPPLEMENT TO SAFETY GUIDE 11 INSTRUMENT LINES PENETRATING PRIMARY REACTOR CONTAINMENT BACKFITTING CONSIDERATIONS D. Introduction loss are within the capability of the reactor coolant makeup Safety Guide 11 describes the regulatory system, position concerning instrument lines penetrating (3) the integrity and functional primary reactor containment for present and performance of secondary future reactors. The purpose of this supplement containment, if provided, and is to provide guidance to applicants and licensees associated safety systems (e.g.,
concerning possible backfitting with regard to filters, standby gas treatment these instrument lines. This supplement does not system) will be maintained, represent a requirement for backfitting; such and requirements will be formulated on an individual (4) the potential offsite exposure case basis pursuant to § 50.109, "Backfitting," will be substantially below the of CFR Part 50. guidelines of 10 CFR Part 100.
E. Regulatory Position b. For each instrument line penetrating containment, including
- 1. Plants for which a notice of hearing on those connected to the application for construction permit was containment atmosphere, some published on or after January 5, 1970, method of verifying during should conform to the regulatory operation the status (open or position in the safety guide. closed) of each isolation valve
- 2. Plants for which a notice of hearing on should be provided.
application for construction permit was 3. Licensees of plants for which a notice published between January 5, 1967, of hearing on application for and December 30, 1969, should meet construction permit was published on.
the following criteria as soon as or before December 30, 1966, should practicable: furnish to the regulatory staff a suitable
- a. Each instrument line connected to analysis of the effects on the secondary the reactor coolant pressure containment, if provided, and boundary and penetrating associated safety systems of a containment should be sized or postulated failure of the piping or of include an orifice such that if a any component in an instrument line postulated failure of the piping or outside primary reactor containment.
of any component (including the With respect to plants for which the postulated rupture of any valve integrity and functional performance of body) in the line outside primary the secondary containment building reactor containment occurs during and associated safety systems cannot be normal reactor operation: maintained under these postulated (1) the leakage is reduced to the conditions, the licensee should provide maximum extent practical protection equivalent to that described consistent with other safety in regulatory position 2.a.(3) above as requirements, soon as practicable consistent with the (2) the rate and extent of coolant reactor shutdown schedule.
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