TNU Sets New Thesis in Topic 317, Requiring PPP to Expressly Cite NHO-01 (Fundacentro) or NR-15 for Recognition of Special Activity Based on Noise Exposure

This page is a translation of the original Portuguese text, provided for convenience. It deals with Brazilian law. If there is any discrepancy, the Portuguese version prevails. Read the original in Portuguese

Brazil’s National Uniformization Panel of the Federal Special Courts (TNU) has set a new thesis in Topic 317. It now requires the Social Security Occupational Profile (PPP) to expressly state the method used to measure noise, either NHO-01 from Fundacentro (Brazil’s federal occupational safety and health foundation) or NR-15, as a condition for recognizing the period as special activity time due to exposure to the harmful agent.

The new guidance set in Topic 317

The decision settles an issue that had been dividing the appellate panels of the Federal Special Courts. Under the thesis, it is not enough for the PPP to record the noise level the worker was exposed to. The document must clearly state which measurement technique the technical professional in charge used to measure that physical agent.

In practice, recognition of special activity based on noise now depends on the form itself citing Occupational Hygiene Standard 01 (NHO-01) from Fundacentro or Regulatory Standard 15 (NR-15) of the Ministry of Labor. Without that information, the technical evidence is weakened, and as a rule the period cannot be converted into special time.

This uniform standard matters because it guides federal judges across the country to decide identical cases in a similar way. Pending cases that dispute special time based on noise are likely to follow this standard, which makes it even more important for insured workers to submit a technically complete PPP from the time of the administrative request.

It is worth remembering that the thesis does not create an entirely new requirement. It makes explicit a demand that already followed from the need for reliable technical evidence. The immediate effect is to narrow the room for interpretation in the trial courts and to standardize how noise exposure must be documented to have social security effects.

Why the noise measurement method matters

Noise is the harmful agent most often disputed in special retirement and time conversion cases. Unlike other agents, the way the sound level is measured directly affects the result. A spot measurement taken at one specific moment can show a different value from the average over the entire workday.

NHO-01 from Fundacentro uses the normalized exposure level, which considers the noise dose over the whole workday. This method aims to reflect the worker’s actual exposure rather than an isolated peak. For that reason, it has become the preferred technical reference for more recent periods.

NR-15, on the other hand, uses the sound pressure level measured in decibels, with tolerance limits that vary according to daily exposure time. For older periods, when NHO-01 was not yet applicable, measurement under NR-15 is generally accepted, as long as it is properly stated in the technical report and in the PPP.

The TNU’s requirement rests on the premise that the judge needs to know which technique produced the figure presented. Without that information, it is impossible to assess whether the measurement met the technical standard required for the period and whether the result can truly prove the exposure was harmful.

Without the measurement method stated in the PPP, noise exposure no longer proves special activity.

The consequence is straightforward. A PPP that reports only the noise level but says nothing about the measurement technique fails to meet the evidentiary requirement. Even if the work was in fact harmful, the corresponding period risks being counted as ordinary time, which affects both the retirement date and the amount of the benefit.

Practical effects for insured workers and employers

The first impact falls on workers who plan to apply for special retirement or convert special time into ordinary time. Before filing the application, it is prudent to check whether the PPP provided by the employer expressly cites NHO-01 or NR-15 in the field for noise measurement.

The second impact affects employers and the technical professionals who prepare the forms. The PPP must be completed based on the Technical Report on Workplace Environmental Conditions (LTCAT) and must faithfully reflect the method used in the measurements. An incomplete document can lead to disputes and force a former employee to seek a correction years later.

There is also an effect on cases already underway. In many cases, the judge may suspend the ruling to gather more evidence and order the PPP to be completed or the technical report that supported the document to be submitted. When the company no longer exists, the evidence may be replaced by a similar report or by an indirect expert examination, which makes the path longer and less certain.

The appeals stage is affected as well. Administrative decisions and judgments that deny special activity solely because the method is not stated tend to be reversed when the insured worker later manages to supplement the technical evidence. That is why having the right documents organized from the start avoids wasted time on appeals and additional proceedings that could have been unnecessary.

For periods in which the noise level exceeds the legal limit in force at the time, correctly stating the method is the key to recognition. The difference between having special activity recognized or not can mean retiring several years earlier and a significantly higher initial monthly benefit amount.

How insured workers should prepare

The core recommendation is to organize your documents before filing any application. You should ask your employer, or previous employers, to issue an updated PPP that expressly refers to the technical measurement standard used in each period of noise exposure.

It is equally important to keep the corresponding LTCAT, because it is the technical basis for the PPP and may be requested to confirm the method. Documents that are consistent with one another reduce the risk of additional requests and speed up the review, both in administrative proceedings and in court.

When an older PPP does not state the required information, the usual solution is to ask the issuer to correct it. If the issuer will not cooperate, you can gather alternative evidence, such as expert reports from labor lawsuits and technical documents from the work activity itself, to show which method was actually used.

It is also advisable to collect employment contracts, registration records, and any internal communications that confirm the position held and the work environment. Together, these reinforce the account of continuous noise exposure and help put the technical evidence in context, especially when the original form has gaps.

Working with a qualified professional makes a difference in this scenario. A prior review of the evidence makes it possible to identify gaps, anticipate requirements, and structure the request to fit the thesis that has been set, avoiding denials based on a merely formal flaw in the document.

Frequently Asked Questions

What changes with the TNU’s new thesis on noise?

The PPP must now expressly state the noise measurement method, NHO-01 or NR-15. Without that information, the period of exposure to the agent, even if real, is unlikely to be recognized as special activity time by INSS (Brazil’s National Social Security Institute) or by the federal courts.

My PPP does not mention NHO-01 or NR-15. Do I lose my right?

Not necessarily. The way forward is to request a correction of the PPP from whoever issued it, based on the LTCAT. If that is not possible, you can present alternative evidence, such as technical reports and expert examinations from other cases, to show which method was actually used to measure the noise.

Does the requirement apply to older periods of work?

The method must be stated whenever noise is the agent at issue. For more recent periods, NHO-01 usually prevails. For earlier periods, measurement under NR-15 is likely to be accepted, as long as the technique is clearly stated in the document and is supported by the technical report from that time.

As informações deste artigo são de caráter informativo e não substituem consulta jurídica individualizada. Cada caso possui particularidades que exigem análise específica.