Haneul Nuclear Reactor in MW4 DMZ: an atom sculpture in front of two cooling towers in radioactive fog — Screenshot: Call of Duty: Modern Warfare 4 © Activision (enhanced)

MW4 DMZ key · Haneul Nuclear Reactor

Reactor DRC Locker Key Location in MW4 DMZ

The Reactor DRC Locker Key opens the DRC Weapons Locker inside Reactor 02's irradiated pool. Its description names grid H4, at Haneul Nuclear Reactor. A reward for the Operation Fallen Ember Story Mission, which takes you into the same reactor.

Last updated October 23, 2026Game version: DMZ Early Access, day 2

◆ Fortress · ■ Compound · L Lieutenant Tower · U UAV Tower · A Ammo Armor Cache · G Gas Station · M Marine Gas Station. Rings show the highest threat level (Low, Medium, High, Critical, Extreme); the white ring is Haneul Nuclear Reactor. Smaller markers from Activision's official Hajin Tac Map. Screenshot: Call of Duty: Modern Warfare 4 © Activision (enhanced)

Where the Reactor DRC Locker is

Location	Haneul Nuclear Reactor
Tac-Map grid	H4
Rarity	Ultra
Highest threat at Haneul Nuclear Reactor	High

The Tac-Map grid runs letters from west to east and numbers from north to south, so H4 is column H, row 4. See Haneul Nuclear Reactor on the interactive Hajin map, and its threat level by area in our Haneul Nuclear Reactor location guide.

What the Reactor DRC Locker Key opens

The DRC Weapons Locker inside Reactor 02's irradiated pool. The key card is Ultra.

Confirmed by 4 sources, including video 1 at 7:26, video 2 at 26:25. Checked 2026-10-21 (DMZ Early Access, day 2).

How to get the Reactor DRC Locker Key

A reward for the Operation Fallen Ember Story Mission, which takes you into the same reactor. The steps are in our Operation Fallen Ember walkthrough.

Keys can go in your Stash between deployments, but anything outside a Secure Slot is lost if your exfil fails. Tick the keys you have in the MW4 DMZ key finder; the list stays in your browser.

Other keys at Haneul Nuclear Reactor

The Chemist's Secure Armory (grid I4): The secured bunker near the boat house at Haneul Nuclear Reactor.
Reactor 02 Control Room (grid H4): The control room inside the Reactor 02 building.
Hazard Storehouse (grid I5): The material storage warehouse south of the reactor's cooling towers.
Utility Maintenance Storage: A maintenance storeroom at the reactor. One source so far, not yet verified.

Questions

Where is the Reactor DRC Locker Key used in MW4 DMZ?

At Haneul Nuclear Reactor, grid H4 on the Tac-Map. It opens the DRC Weapons Locker inside Reactor 02's irradiated pool.

How do you get the Reactor DRC Locker Key?

A reward for the Operation Fallen Ember Story Mission, which takes you into the same reactor.

What rarity is the Reactor DRC Locker Key?

Ultra, as its key card shows.

Every confirmed MW4 DMZ key with its own page

Sources

Checked against the official posts on October 21, 2026. The key itself comes from players’ videos, linked above at the moment they show it; we only give a key its own page once two different sources agree.