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NEBOSH

NEBOSH INTERNATIONAL DIPLOMAIN OCCUPATIONAL HEALTH AND SAFETY

Unit IC: International workplace and workequipment safety

THURSDAY 5 JULY 20123 hours, 0930 to 1230

10 minutes reading time is allowed before the start of this examination. You may not write anything during this period.

Answer both Section A and Section B

SECTION A

This section contains six questions. Answer ALL SIX questions.

All questions carry equal marks.

The maximum marks for each question, or part of a question, are shown in brackets.

You are advised to spend about 15 minutes on each question.

Start each answer on a new page.

1 A sewer has collapsed and it is necessary to inspect the damage prior to itsrepair. The inspection requires entry into a confined space 10 metres deep.

Outline risks to those entering the sewer. (10)

2 (a) Outline the principles of a Boiling Liquid Expanding Vapour Explosion(BLEVE) AND give examples of actual incidents to support your answer. (8)

(b) Outline the effects of a BLEVE. (2)

3 Outline the issues that should be included in a fire safety training session forworkers. (10)

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4 Outline the characteristic features of, and factors that promote, the followingtypes of materials failure:

(a) brittle fracture; (5)

(b) ductile failure. (5)

5 Direct contact with live parts of an electrical supply within a workplace can resultin serious injury or death.

Outline a range of control measures that may prevent or reduce the effect of suchcontact. (10)

6 Outline factors that a competent person would need to take into account whendeciding the frequency of examination of lifting equipment. (10)

SECTION B

This section contains five questions. Answer THREE questions only.

All questions carry equal marks.

The maximum marks for each question, or part of a question, are shown in brackets.

You are advised to spend about 30 minutes on each question.

Start each answer on a new page.

7 Outline the advantages and limitations of the following types of fall protectiondevices AND give an example where EACH could be used:

(a) safety harnesses; (5)

(b) safety belts; (5)

(c) safety nets; (5)

(d) air bags. (5)

8 As part of a water treatment system, a manufacturer is to install a plant suitablefor the reception and storage of sulphuric acid and caustic soda, both of which willbe delivered in road tankers. These substances are highly corrosive and can reactviolently together.

Outline the safety provisions required for:

(a) the design; (10)

(b) the operation; (6)

(c) the maintenance of the proposed storage facility. (4)

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9 (a) Outline the features of industrial robots that may have particularimplications for safety. (6)

(b) Outline how the risk of injury to personnel working with, or in the vicinityof, industrial robots might be minimised. (14)

10 In relation to dust explosions:

(a) outline the conditions that must be present for a primary dust explosion tooccur; (4)

(b) outline the additional conditions necessary for secondary explosions tooccur; (4)

(c) identify FOUR key features of a nitrogen inerting system used in achemical process; (4)

(d) other than a nitrogen inerting system outline design features that wouldminimise the risk of a dust explosion. (8)

11 (a) Outline the causes of instability in forklift trucks (FLTs). (8)

(b) Outline the content of a training programme for FLT operators who are tooperate a variety of forklift trucks. (9)

(c) Identify THREE situations in which refresher training for forklift truckdrivers would be appropriate. (3)