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  Radiator Micro-Meteoroid and Orbital Debris Protection
  (Rad MMOD Protection)

Problem: With the increase of Orbital debris due to space craft events, the risk of puncture of an Orbiter radiator has increased. Previously, the Shuttle Program has reduced this risk by flying attitudes that provide the maximum protection from this debris. In evaluation of International Space Station (ISS) assembly and support, the Orbiter attitude is driven by ISS and cannot adjust attitude to protect the radiator.
Solution: The Space Shuttle Program has implemented both radiator protection and isolation capability to reduce the risk of puncture to the radiator and reduce the risk of entry on a single Freon loop. The radiator protection is the addition of strips of aluminum tape over each of the freon loops in the radiator. The isolation is the addition of a check valve, an isolation valve and the associated software change to detect a leaking radiator and isolate automatically.
Initial Operation Date: Phase II Upgrade
OV-102 STS-103 (12/2/99)
OV-103 isolation STS- 97(4/8/99), shielding STS-116(5/10/01)
OV-104 STS-92(1/14/99)
OV-105 isolation STS-96(12/9/98), shielding STS-105(2/10/00)
Technology Goal: No technologies involved in this modification.
Goals Supported: 1) Fly Safely

Curator: Kim Dismukes | Responsible NASA Official: John Ira Petty | Updated: 04/07/2002
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