4.1 HACCP Principles 1 to 3: Hazard Analysis, CCPs, & Critical Limits

4.1 HACCP Principles 1 to 3: Hazard Analysis, CCPs, & Critical Limits

Exam Key: HACCP was originally developed in the 1960s by the Pillsbury Company, NASA, and the U.S. Army Natick Laboratories to guarantee 100% sterile food for space travel. Standardized by the National Advisory Committee on Microbiological Criteria for Foods (NACMCF) in 1997 and Codex Alimentarius, HACCP is a systematic, preventive approach to food safety.

The 5 Preliminary Tasks of HACCP

Before applying the seven principles of HACCP, a food facility must complete five mandatory preliminary organizational steps:

1. Assemble the Multidisciplinary HACCP Team: Include individuals from quality assurance, plant operations, sanitation, equipment maintenance, and food microbiology. External experts may supplement internal knowledge.
2. Describe the Food Product and Distribution: Document raw ingredients, processing methods, packaging (e.g., MAP, vacuum, glass), storage conditions (ambient, refrigerated, frozen), and distribution channels.
3. Identify Intended Use and Target Consumers: Define how the consumer will prepare the food (e.g., ready-to-eat vs. cook-and-serve) and specify if the product targets highly susceptible populations (vulnerable groups: elderly, infants, pregnant women, immunocompromised individuals).
4. Construct the Process Flow Diagram: Map every step in the operation from raw material receiving, storage, preparation, processing, packaging, and holding to final shipping.
5. Conduct On-Site Verification of the Flow Diagram: The HACCP team must physically walk through the facility during active operations across all work shifts to verify that the flow diagram accurately reflects real-world processing steps.

---

Principle 1: Conduct a Hazard Analysis

Hazard Analysis is the process of collecting and evaluating information on hazards associated with the food under consideration to decide which are significant and must be addressed in the HACCP plan.

The Three Hazard Categories

• Biological Hazards: Pathogenic bacteria (Salmonella spp., Escherichia coli O157:H7, Listeria monocytogenes, Clostridium botulinum), viruses (Norovirus, Hepatitis A), parasites (Cryptosporidium, Giardia, Trichinella spiralis), and toxin-producing molds.
• Chemical Hazards: Naturally occurring toxins (mycotoxins, histamine/scombroid toxin, ciguatoxin), intentional chemical additions (unapproved colors/preservatives), unintentional contaminants (cleaning chemicals, sanitizers, pest control compounds, heavy metals), and mandatory food allergens (the Big 9 U.S. allergens).
• Physical Hazards: Foreign materials capable of causing physical trauma, choked airways, or internal lacerations. FDA Compliance Policy Guide 555.425 identifies hard or sharp objects measuring 7 mm to 25 mm in length as significant hazards.

Risk Assessment: Likelihood vs. Severity

A hazard is classified as a significant hazard requiring control in the HACCP plan based on a two-dimensional matrix:

$\text{Risk Level} = \text{Likelihood of Occurrence} \times \text{Severity of Consequences}$

---

Principle 2: Determine Critical Control Points (CCPs)

A Critical Control Point (CCP) is defined as a step at which control can be applied and is essential to prevent or eliminate a food safety hazard or reduce it to an acceptable level.

Distinguishing CCPs, CPs, and PRPs

• Critical Control Point (CCP): Focuses specifically on significant safety hazards (e.g., cooking chicken to $165^{°}F$ to kill Salmonella).
• Control Point (CP): Any step where biological, chemical, or physical factors can be controlled, but control is not essential to prevent a safety hazard (e.g., chilling cut lettuce to maintain crispness and quality).
• Prerequisite Program (PRP): Controls general environment and baseline operational hygiene (e.g., employee handwashing or master sanitation schedules).

The Codex/NACMCF CCP Decision Tree

To determine objectively whether a step is a CCP, the HACCP team applies the standard 4-question decision tree logic to each identified significant hazard:

[ Question 1: Do preventive control measures exist? ]
       |                                      |
      Yes                                     No --> [ Modify step or process ]
       v
[ Question 2: Is the step specifically designed to eliminate ]
[ or reduce the hazard to an acceptable level?             ]
       |                                      |
      Yes --> ( IT IS A CCP! )               No
                                              v
[ Question 3: Could contamination occur in excess of acceptable levels? ]
       |                                      |
      Yes                                     No --> ( NOT A CCP )
       v
[ Question 4: Will a subsequent step eliminate or reduce the hazard? ]
       |                                      |
      Yes --> ( NOT A CCP )                  No --> ( IT IS A CCP! )

---

Principle 3: Establish Critical Limits

A Critical Limit (CL) is a maximum and/or minimum value to which a biological, chemical, or physical parameter must be controlled at a CCP to prevent, eliminate, or reduce to an acceptable level the occurrence of a food safety hazard.

Characteristics of Critical Limits

• Measurable & Observable: Critical limits must be quantifiable in real time on the processing line. Parameters include temperature, time, physical dimensions, flow rate, pH, water activity ($A_w$), moisture content, and available chlorine concentration (ppm).
• Boundaries of Safety: Critical limits mark the exact line between safe and unsafe product. They must never be based on subjective guesswork.
• Scientific Validation: Critical limits must be backed by published regulatory standards (e.g., FDA Food Code, USDA FSIS Performance Standards), peer-reviewed scientific literature, or experimental validation studies conducted by recognized Processing Authorities.

Common Critical Limit Examples

Critical Limits vs. Operating Limits

Facilities often establish stricter internal targets called Operating Limits to prevent accidental critical limit breaches. For example, if the Critical Limit for cooking chicken is $165^{°}F$, an facility might set an Operating Limit of $170^{°}F$. If the temperature drops to $168^{°}F$, operators adjust the oven heat without causing a regulatory HACCP deviation.