ML20003H821
| ML20003H821 | |
| Person / Time | |
|---|---|
| Issue date: | 01/10/1978 |
| From: | Clark R Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17209B280 | List: |
| References | |
| RTR-REGGD-05.012, RTR-REGGD-5.012 NUDOCS 8105070496 | |
| Download: ML20003H821 (1) | |
Text
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UNITED STATES
,7 > 1 NUCLEAR REGULATORY COMMISslON 1
WASWNGTON D. C. 20555
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MEMORANDUM FOR: Reactor Safeguards Licensing Branch FROM:
Robert A. Clark, Chief Reactor Safeguards Licensing Branch COMPENSATORY MEASURES FOR VITAL AREAS LACKING
SUBJECT:
THE "TWO BARRIER PROTECTION" - REVIEW GUIDELINE NUMBER 13 10 CFR 73.55 requires that vital'equioment be protected by a minimum of two tarriers i.e., Protected and Vital, which are defined in The barriers coupled with the defense in depth concept, 10 CFR 73.2.
isolation zones, continuous monitoring and periodic surveillance result in high assurance detection and resistance to penetration.
In some cases barrier separation is impossible to achieve due to l'
operaticnal design needs, as exemplified most often by the positioning of the service water intake structures on borders of bodies of water.
In other cases location of vital equipment was instituted prior to the issuance of 73.55, making it impractical to require relocation.
In both cases other measures must be implemented to compensate for the loss of the basic criteria.
The following represent some acceptable compensatory (or equivalent) measures that may be used together or separately (depending upon site specifics) in achieving the objective:
1.
Hardening of common barriers.
2.
Additional "early warning" monitoring devices.
More frequent surveillance.
3.
Positive response posture to common barrier locations.
4.
positioning of security post in close proximity of cor:rnon 5.
barriers.
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Robert A. Clark, Chief Reactor Safeguards Licensing Branch 8105070
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