# US 12,224,075 B2 · Method of improving the explosion safety of nuclear power plants

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- Number: US 12,224,075 B2
- Document ID: US12224075B2
- Status: Granted
- Kind: B2
- Application number: 17/770,589
- Filed: 2020-10-05
- Published: 2022-11-24
- Granted: 2025-02-11
- Earliest claimed: 2019-10-24
- Assignees: State Atomic Energy Corporation “Rosatom” Acts on Behalf of the Russian Federation
- Applicants: State Atomic Energy Corporation “ROSATOM” Acts on Behalf of the Russian Federation
- Inventors: Gennadij Leonidovich Agafonov; Sergej Pavlovich Medvedev; Viktor Nikolaevich Mikhalkin; Andrei Aleksandrovich Nekrasov; Vyacheslav Aleksandrovich Petukhov; Yurij Vasilevich Petrushevich; Andrej Nikonovich Starostin; Mikhail Dmitrievich Taran; Sergej Viktorovich Khomik
- Web page: https://patentgrep.com/patent/US12224075B2

## CPC

- G21D 1/02: Arrangements of auxiliary equipment
- F42D 5/045: Detonation-wave absorbing or damping means
- G21D: NUCLEAR POWER PLANT
- F42D: BLASTING (fuses, e.g. fuse cords, C06C5/00; {for obtaining fluid from wells E21B43/00; for mining or quarrying E21C37/00; for making tunnels or galleries E21D9/006}; cartridges F42B3/00)

## Abstract

The invention relates to methods of decreasing the effect of blast loads on industrial spaces relating to, inter alia, nuclear power plant and large chemical manufacturing facilities. A method of improving explosion safety in closed spaces by attenuating the effect of a combustion wave or shock wave on a protected surface consists in placing obstructions before the protected surface in the form of elastic membranes filled with a flame-retardant substance. A non-flammable gas is used as the substance filling the membranes; the membranes themselves are made of a material that disintegrates during, and under the action of, displacement of the front of a combustion wave or shock wave along the surface of the membranes. The membranes are filled with a non-flammable gas immediately after flammable gas is detected at a dangerous concentration in the space in front of the protected object. The technical result consists in increasing explosion safety, decreasing the effect that an explosive wave formed in an accidental explosion of fuel-air mixtures has on the walls and floors of protected spaces.

## Claims

### Claim 1

The invention method of improving explosion safety in closed spaces by attenuating the effect of a combustion wave or shock wave on a protected surface, comprising placing obstructions before the protected surface in the form of elastic membranes filled with a flame-retardant substance, characterized in that a non-flammable gas is used as the substance filling the membranes; the membranes themselves are made of a material that disintegrates during, and under the action of, displacement of the front of a combustion wave or shock wave along the surface of the membranes, wherein the membranes are filled with a non-flammable gas immediately after flammable gas is detected at a dangerous concentration in the space in front of the protected object.

### Claim 2 (depends on 1)

The method of claim 1, wherein helium is used as the non-flammable substance filling the elastic membranes.

### Claim 3 (depends on 1)

The method of claim 1, wherein the elastic membranes are placed before the protected surface in at least two layers.

### Claim 4 (depends on 3)

The method of claim 3, wherein each subsequent layer of the elastic membranes is located in depressions of the previous one.

### Claim 5 (depends on 1)

The method of claim 1, wherein an air/helium mixture with a helium content of at least 50 vol. % is used as the non-flammable substance filling the elastic membranes.

### Claim 6 (depends on 2)

The method of claim 2, wherein membranes filled with air are placed before the membranes filled with helium.

### Claim 7 (depends on 1)

The method of claim 1, wherein the total thickness of the elastic membranes filled with non-flammable substance along the normal to the protected surface exceeds two critical detonation diameters in the free space for the stoichiometric mixture.