The regen process will be terminated before sleeptime, at ~5:15pm EDT. Regeneration of bed #2 follows tomorrow. (Regeneration of each of the two cartridges takes about 12 hours and is conducted only during crew awake periods. In order to assist in atmosphere scrubbing after the Freon-218 (Khladon) spill from the SKV-2 air conditioner on 4/24, the BMP's regeneration cycle was moded to 5 days instead of the regular 20 days.)
Volkov & Kononenko spent another 2 hrs working jointly on cargo transfers & stowage from Progress 29P, tracking the moves in the IMS (Inventory Management System).
Reisman meanwhile performed the periodic checkup on active U.S. payloads, i.e., cleaning the ANITA (Analyzing Interferometer for Ambient Air) inlet plus inspecting and filter cleaning of the CGBA-5 (Commercial Generic Bioprocessing Apparatus 5) incubator payload. (The CGBA incubator is controlled from the ground, with automatic video downlinked to Earth. ANITA is now back up again and running in support of the on-going Freon-218 scrubbing from the cabin air, collecting data every six seconds and downlinking the data daily to the ground team. ANITA monitors low levels of potential gaseous contaminants in the ISS cabin atmosphere with a capability of simultaneously monitoring 32 gaseous contaminants. The experiment is testing the accuracy and reliability of this technology as a potential next-generation atmosphere trace-gas monitoring system for ISS and future spacecraft. This is a cooperative investigation with ESA.)
Afterwards, the FE-2 worked in the Node-2 reconfiguring the food container stowage in 'Harmony'.
Volkov upgraded the Russian RSK1 laptop with new software and ran a test on the fresh load.
Afterwards, Sergey performed monthly maintenance on the deactivated Russian IK0501 GA (Gas Analyzer) of the SOGS Pressure Control & Atmospheric Monitoring System by replacing its CO2 filter assembly (BF) with a new unit from FGB stowage (done last: 4/11), then reactivating the unit.
FE-1 Kononenko completed another routine radiation data monitoring & logging session for flow & dose power data with the MATRYOSHKA-R and AST spectrometer radiation payload. (Data were downloaded via OCA and the memory storage card was replaced.)
Continuing the extended leak checking of the spare BZh Liquid Unit (#056) for the Elektron O2 generator, Kononenko charged the unit once again with pressurized N2 from the BPA Nitrogen Purge Unit (#23) to 1 atm (1 kg/cm2). The last test pressurization was on 4/13. (During Elektron operation, the inert gas locked up in the BZh has the purpose to prevent dangerous O2/H2 mixing. A leaking BZh cannot be used.)
In the Airlock (A/L), the crew connected EMUs (Extravehicular Mobility Units) #3003 & #3004 to their SCUs (Service & Cooling Umbilicals) and initiated the standard 1-hr scrubbing process on the spacesuit's cooling water loops, filtering ionic and particulate matter (via a 3-micron filter). The cooling loops were afterwards reconfigured and the EMU water processing kit disassembled and stowed.
Volkov serviced the MSG (Microgravity Science Glovebox), conducting the periodic performance test on the 7SD MOK pressure sensor.
The FE-1 set up the pumping equipment and initiated (later closed out) the periodic 3-hr transfer of urine from EDV-U containers in the SM to the Rodnik BV tanks of Progress M-64/29P (emptied of potable water yesterday).
Garrett Reisman conducted the weekly 10-min. CWC audit as part of on-going WDS (Water Delivery System) assessment of onboard water supplies. (Updated 'cue cards' based on the crew's water calldowns are sent up every other week. The current cue card (17-0002E) lists 39 CWCs (~1378.8.1 L total) for the four types of water identified on board: technical water (756.7 L, for Elektron, flushing, hygiene, including470.3 L non-usable water because of Wautersia bacteria), potable water (534.8 L, incl. 88.7 L currently on hold), condensate water (81.5 L), waste/EMU dump and other (5.8 L). Wautersia bacteria are typical water-borne microorganisms that have been seen previously in ISS water sources. These isolates pose no threat to human health.)
Later, the FE-2 filled out the regular FFQ (Food Frequency Questionnaire), his ninth, on the MEC (Medical Equipment Computer). (On the FFQs, NASA/ESA astronauts keep a personalized log of their nutritional intake over time on special MEC software. Recorded are the amounts consumed during the past week of such food items as beverages, cereals, grains, eggs, breads, snacks, sweets, fruit, beans, soup, vegetables, dairy, fish, meat, chicken, sauces & spreads, and vitamins. The FFQ is performed once a week to estimate nutrient intake from the previous week and to give recommendations to ground specialists that help maintain optimal crew health. Weekly estimation has been verified to be reliable enough that nutrients do not need to be tracked daily.)
Sergey and Garrett reviewed the 400mm & 800mm training videos for photographing the Shuttle RPM (R-bar Pitch Maneuver), then, at 11:15am EDT, linked up with ground specialists at MCC-H for a 15-min debrief to discuss the images downlinked from their recent (5/16) Shuttle RPM skill training. (The skill training prepares the crew for the bottom side mapping of the Discovery upon its arrival on 6/2. During the RPM at ~600 ft from the station, the ISS crew will have only ~90 seconds for taking high-resolution digital photographs of all tile areas and door seals on the Orbiter, to be downlinked for launch debris assessment. Thus, time available for the shooting will be very limited, requiring great coordination between the two headset-equipped photographers and the Shuttle.)
Reisman had another hour for his departure preparations and prepacking.
Volkov completed the routine maintenance of the SM's SOZh/ECLSS system, including ASU toilet facilities systems/replaceables. (Regular daily SOZh maintenance consists of replacement of the KTO & KBO solid waste containers, replacement of an EDV-SV waste water and EDV-U urine container, and processing U.S. condensate water as it becomes available in a filled CWC from the Lab humidifier.)
Kononenko performed the daily IMS (Inventory Management System) maintenance, updating/editing its standard 'delta file' including stowage locations, for the regular weekly automated export/import to its three databases on the ground (Houston, Moscow, Baikonur).
The crew conducted their regular 2.5-hr. physical workout program (about half of which is used for setup & post-exercise personal hygiene) on the TVIS treadmill (CDR, FE-1, FE-2), RED resistive exercise device (CDR, FE-1, FE-2), and VELO bike with bungee cord load trainer (CDR, FE-1).
Afterwards, Oleg transferred the crew's exercise data file to the MEC for downlink, as well as the daily wristband HRM (Heart Rate Monitor) data of the workouts on RED, followed by their erasure on the HRM storage medium (done six times a week).
Garrett conducted the periodic atmospheric sampling in the center of the Lab, SM and JLP with the GSC (Grab Sample Container, #1052, #1095, plus one new from 29P). The three GSCs were then prepacked for return on STS-124/1J.
At ~12:50am, Reisman supported a PAO event downlink for the "G Word" program on the Discovery Home Network which focused on the crew's thoughts on the environment and the planet from orbit.