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SA-AA-111 — Heat Stress Control

⚠️ DRAFT

SA-AA-111 — Heat Stress Control

DRAFT — Reconstructed from exam materials

Purpose

Provides guidance for evaluating and controlling heat stress exposure for personnel performing work activities in elevated temperature environments, including containment entries. Includes stay time determination, work rate classification, clothing adjustment factors, extended stay time calculations, and recovery time formulas.

Key Actions / Information

Work Environment Classification

WBGT RangeClassificationSource
Elevated temperaturesHigh TemperatureSA-AA-111 step 4.1

Work Rate Classification (Attachment 2)

Work rate determines metabolic heat generation. Classification based on most frequent workload activity (>50% of work time):

Work RateDescriptionSource
LowSedentary activities: sitting, standing still, inspections, operating instruments and powered equipmentSA-AA-111 step 4.2
ModerateEasily accomplished in thermally comfortable environment: pump and valve rebuilds, sorting materials. Heavy exertion broken by periods of light activity or rest (without negative pressure respirators)SA-AA-111 step 4.2
HighSustained heavy physical exertion: climbing, heavy manual valve operation, continuous physical effort. Also: Low activities with negative pressure air-purifying respirators classify as Moderate; Moderate activities with negative pressure air-purifying respirators classify as HighSA-AA-111 step 4.2

Clothing Ensemble Adjustment Factors (Step 4.3)

Clothing EnsembleWBGT AdjustmentSource
Double Cloth Coveralls (Double PCs)+9 FSA-AA-111 step 4.3

Stay Time Determination (Attachment 3)

Effective WBGT = measured WBGT + clothing adjustment factor. Use Attachment 3 with effective WBGT and work rate to determine Stay Time.

Maximum Extended Stay Time (Step 4.6)

Maximum Extended Stay Time = 1.5 x Stay Time. Check Times cannot extend beyond 1.5 times the established Stay Time.

Recovery Time (Step 4.8)

Recovery Time = (Actual Work Time / Stay Time) x 60 minutes

JPM — 2018 SRO-A2
Containment entry for PZR spray valve isolation (2PS28 in dog house): WBGT = 89 F, double PCs (+9 F adjustment) = 98 F effective WBGT. Work rate = High (sustained heavy physical exertion — valve wrench, climbing ladders, two operators required). Using Attachment 3: Stay Time = 20 min. Maximum Extended Stay Time = 1.5 x 20 = 30 min. Recovery Time using max extended stay time: (30/20) x 60 = 90 min. Key difference from the 2019 JPM: the 2018 cue says "assume the task required the use of the maximum extended stay time" so Actual Work Time = 30 min (not 20), yielding 90 min recovery (not 60).
JPM — 2019 SRO-A2
Same scenario (PZR spray valve 2PS28 containment entry) but with different recovery time question: "Assume the task will NOT use the Maximum Extended Stay Time." Stay Time = 20 min. Max Extended Stay Time = 30 min. Recovery Time = (20/20) x 60 = 60 min.

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