NUCLEAR POWER CORPORATION OF INDIA LIMITED TARAPUR ATOMIC POWER STATION 1&2

TECHNICAL SPECIFICATION FOR FABRICATION AND TESTING OF COMBINED HEPA AND CHARCOAL FILTER (CH & CF)

SPECIFICATION NO: NPCIL/CH&CF/PB-E-594 (I), R-1

REF: USI NO: 73140

DATE OF REVISION: SEPTEMBER, 2010

TOTAL NO. OF PAGES: 26

( Including cover sheet and Drawings)

Note: This specification has been prepared on the basis of BARC Specification No.

CPIF/WMD/1101/718 and revised based on NPCIL experience.

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This Technical Specification contains following five Divisions

1. Division – I: Technical specification for High Efficiency Particulate Air Filters ( HEPA ) Category-1 and testing procedure.

2. Division – II: Technical Specification for Charcoal Filter and Testing Procedure

3. Division – III: Assembly of HEPA with Charcoal Filter and Testing Procedure

4. Division – IV: Quality Assurance Plan ( QAP )

5. Division – V: All Five Sketches

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Division – I

TECHNICAL SPECIFICATION FOR HIGH EFFICIENCY PARTICULATE AIR FILTERS (HEPA) CATEGORY-1 REQUIRED FOR COMBINED HEPA AND

CHARCOAL FILTER (CH & CF) AND TESTING PROCEDURE

1.0 SCOPE: The scope of this specification covers manufacture, testing at works, packing and delivery to TAPS 1&2, TMS, NPCIL of High Efficiency Particulate Air Filters ( HEPA ) as specified below:

2.0 SPECIFIC RATING AND PERFORMANCE:

2.1 Capacity:

1700 Cubic meter per hour ( Rated air flow at ambient temperature and pressure)

2.2 Overall Dimensions:

Face : 602 mm X 602 mm ( + 0 mm, - 3.0 mm ) Depth : 292 mm ( + 1.5 mm, - 0 mm ) No gasket is required for these HEPA Filters which will be assembled with charcoal filter. 2.3 Initial Pressure Drop:

Not more than 25 mm of water gauge at the rated capacity of 1700 CMH

2.4 Collection Efficiency:

Not less than 99.97% for submission aerosol of 0.3 micron size as per BARC HEM’ 99 at the rated air flow of 1700 CMH. 2.5 Temperature Resistance:

Upto 120 degree C

2.6 Humidity Resistance:

100% RH

3.0 MATERIAL OF CONSTRUCTION:

3.1 Filter Frame/casing: Epoxy painted, Fire retardant/resistant good quality plywood as per IS 5509/1980 of

19mm thickness as supplied by M/s. Western India Plywood Ltd., Cannanore, Keralaorequivalent. A sample of 150 mm 150 mm must accompany the offer.

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3.2 HEPA Filter Medium:

Water repellent 100% micro glass fibre ( Borosilicate ) filter medium having the following characteristics:

Sr. No. Required tests Acceptance criteria a) Basic weight Not less than 78 gms/Sq.m b) Thickness Not less than 0.4 mm c) Airflow resistance at 2.5

cms/sec. Not less than 25 mm w.g.

d) Particulars removal efficiency

Not less than 99.98% for submicron aerosol

e) Water repellency Zero penetration through the medium upto 762 mm of water head.

f) Tensile strength Not less than 450 gms/cm. width in both machine and cross directions.

g) Combustible content Not more than 8% h) Folding strength Medium shall show no tears break or cracks when a

specimen is bent 180 degree around a 1.6 mm dia mandrel.

i) Uniformity The medium should have uniform properties all over its length

3.3 HEPA Filter Separator:

Corrugated aluminium foil of minimum 0.038 mm thickness.

3.4 Sealant:

Sealant used for sealing the filter pack with the filter frame shall be oil resistant and shall be adequate to meet the temperature and humidity conditions specified. When set. The set sealant shall not show cracks or tendency to peal off from the filter frame.

4.0 FILTER ASSEMBLY:

4.1 The filter shall not have splices and shall not be spot patched to repair holes or cracks.

4.2 The filter shall consist of 140 +/- 5 nos. of pleats (total number of separators counted from both faces) accommodating around 21.5 sq.m. (230 sq.ft.) of filter medium.

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4.3 The edges of the separators shall extend atleast 3 mm beyond the pleats but not closer than 3 mm to the filter frame. The pleats and separators shall not be, as far as possible kinked from a straight like drawn end to end of the pleat and shall be perpendicular to the frame.

4.4 The filter shall have adequate corner strength to avoid racking or skewing during handling, transportation and installation. The core of the assembly shall be tight.

4.5 The sealant shall be uniformly supplied and the sealant shall be perfectly dry and set.

4.6 The painting and the overall finish and look shall be neat and clean.

5.0 ASSEMBLY AND TOLERENCES:

5.1 Face dimensions : 0, 3.0 mm

within 3.0 mm

5.2 Depth : + 1.5, - 0 mm

5.3 Squareness : Face diagonals of both faces shall be equal

5.4 Faces : The gasket seating surfaces shall be square with the sides of the frame and shall be flat and parallel within 1.5 mm total allowances, when measured with one face of the filter on a surface plate. Sides of the assembled filter shall not bow inward or outward more than 1.5 mm in 300 mm, as measured on the outside of the frame.

6.0 TESTING AND INSPECTION:

The following testing and inspection works shall be carried out at the manufacturer’s site in the presence of the indenter or his representative or QA Engineer.

6.1 Flow pressure drop and collection efficiency:

Each filter shall be individually tested for its initial pressure drop and collection efficiency at the rated flow at 1700 CMH, as per the approved test procedure, at the manufacturer’s site. The test results (airflow, pressure drop and collection

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efficiency) the airflow direction and the date of testing shall be marked on the filter, after approval and acceptance. Only filters assembled and completed in all respects with totally cured and dried sealant and of specified dimensions shall be taken up for this performance evaluation.

7.0 QUALIFICATION TESTS:

One out of every 50 filters or part at the discretion of the indenture shall be tested for the following tests at manufacturer’s works, on a randomly selected filter.

7.1 Core tightness test:

The core tightness test of the filter shall be tested as per the following procedure:

Lay filter face down on a flat surface. Place a 100 X 150 mm block of wood covered with a neoprene pad glued to one surface at the centre of the filter face. Place a 2.0 Kg. weight on the block in a direction parallel to the face of the filter and perpendicular to the pleats shall cause the block to move no more than 1.5 mm from its original position in eight direction.

8.0 ENCLOSURE TO BE PROVIDED WITH OFFER:

The following shall be positively enclosed with the offer without which the offer shall not be considered.

8.1 Details of filter testing facilities:

The details shall be indicate the schematic (flow sheet) of the test rig available with the manufacturer for evaluation of flow, pressure drop and collection efficiency of the filter the type of test method employed with reference numbers of standards, if any adopted the characteristics of test aerosol, the equipment used for measurement of aerosol concentrations, flow and pressure drop etc.

8.2 Details of filter medium:

A copy of manufacturer’s specification/data sheet and two sample pieces of filter medium proposed to be used in the assembly of filters, in 292 X 292 mm size each packed between rigid supports to avoid damage shall be enclosed. (Once the order

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is placed after approving the enclosed sample the complete lot of filters against the order shall be assembled by the manufacturer using the same quality of filter medium.

9.0 APPROVAL OF MANUFACTURING AND TESTING FACILITIES:

A visit to the works of the filter manufacturer will be undertake, if considered necessary, to assess the manufacturing and testing capacities, if the offer of the firm is found, prime facie, acceptable on technical and cost considerations before final placement of the order.

10.0 QUOTATION:

10.1 The offer shall qualify all clauses of our specification and deviations, if any from our specifications shall clearly be brought in the offer.

10.2 The price quoted shall clearly indicate the basic unit price, taxes/excise duty applicable, packing and forwarding charges, if any for tests to be carried out at manufacturer’s site etc.

11.0 TESTING PROCEDURE: Testing procedure for HEPA filter is as per Annexure-I

12.0 SPECIAL NOTES:

12.1 HEPA filters of steel body is used in HEPA bank with a depth of 300 mm whereas fire retardant wooden body is used for HEPA filter with a depth of 292 mm in combined HEPA and Charcoal filter.

12.2 No gaskets are required for HEPA filters for combined HEPA and Charcoal filters. 12.3 Gaskets are required for Spare HEPA filters for the same purpose 12.4 Rough handling test is not required for wooden HEPA filters. 12.5 Spare HEPA filters as per indent shall be of same specification as assembled in

combined HEPA and Charcoal filters.

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ANNEXURE-I

REFERENCE OF TEST PROCEDURE FOR HEPA FILTER

Sr. No.

PROCEDURE DESCRIPTION

REFERENCE DOCUMENT

ACCEPTABLE CRITERIA

1. a. EVALUATION OF

PERCENTAGE EFFICIENCY WITH DOP b. PRESSURE DROP OF HEPA FILTERS

BARC DOCUMENT HEM’99

a. EFFICIENCY: MORE THAN 99.97% AT 0.3 MICRONS PARTICAL SIZE

b. PRESSURE DROP: LESS THAN 25 MM W.C. AT 1700 CMH FLOW

c. 2. MESUREMENT OF CORE

TIGHTENESS ON A HEPA FILTER

BARC DOCUMENT HEM’99

LESS THA 1.5 MM

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DIVISION-II

Technical Specification NPCIL/CH&CF/PB-E-594 ( Charcoal ) R-1 dated August, 2010

TECHNICAL SPECIFICATION FOR CHARCOAL FILTER AND TESTING PROCEDURE

1.0 SCOPE:

The scope of this specification covers procurement of raw materials, assembly as per enclosed drawing, testing, packing and delivery of combined Particulate and Iodine Filters as per specified below:

2.0 SPECIFIC RATING AND PERFORMANCE: 2.1. Rated capacity :

1700 CMH ( Rated air flow at ambient temperature and pressure ) 2.2. Overall Dimensions: (Please refer Drawing No. NPC/M&OM/CHCF/SK-1 )

Face : 648 mm x 648 mm

Depth : 1372 mm ( excluding gaskets )

2.3. Dimensional tolerances : Face : + 0 mm, - 3 mm

Depth : = 3 mm, - 0 mm

Difference between diagonals should be within 3 mm.

3.0 MATERIAL OF CONSTRUCTION:

3.1 FILTER CASING:

The Filter Casing is made out of Fire Retardant/resistant plywood as per IS 5509/1980 of 19 mm thickness as manufactured by M/s. Western India Plywood Mfg. Co., Cannanore, Keral or equivalent.

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3.2 HEPA Filter Separator : Corrogated alluminium foil of minimum 0.038 mm thickness

3.3 Adsorbent Trays :

Perforated G.I. sheet trays as per enclosed drawing (Drawing No. NPCIL/Maint./CH&CF/SK-02) and specification given in Annexure- II.

3.4 Adsorbent :

Impregnated activated charcoal as per enclosed specifications given in Annexure – 2

and tested and certified by NPCIL.

3.5 Packing of Activated Charcoal:

All Six Trays of each filter are to be packed with the selected and certified

imprtegnated activated charcoal as mentioned in Annexure-III to its packing density,

so that no voids are left for channelling of air to occur.

3.6 Tissue Paper :

Glass fibre phenolic tissue paper RP “O” manufactured and supplied by M/s. Fibre Glass Pilkington, Mumbai or equivalent.

3.7 Sealant : Fevicol-SH as manufactured by M/s. Pidilite Industries, Mumbai.

3.8 Pt-100 RTD:

Pt-100, two core, MI insulated, SS sheated, 6 mm OD RTD with connecting cable length of 1.25 M, as manufactured by M/s. Altop Controls, Mumbai or equivalent.

3.9 RTD Clamps :

RTD clamps as per enclosed drawing NPC/M&OM/CHCF/SK-3

3.10 Face Guard :

Face guards as per enclosed drawing ( Drawing No. NPCIL/Maint./CH&CF/SK-02

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3.11 Gaskets:

Soft, closed-pore neoprene gasket strips having shore ‘A’ hardness less than 10 of size 648 mm length, 19 mm width and 6 mm thick with cuts for dove tail joints at corners. To be supplied loose for fixing to the filters before use.

3.12 Paint:

Chemical resistant epoxy primer and epoxy grey paint.

4.0 Test procedure for activated charcoal is enclosed as Annexure-III

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ANNEXURE-II

SPECIFICATIONS OF PERFORATED GI TRAYS

1. Arrangement of Perforated GI Sheet: Galvanized steel trays of size 915 mm X 597 mm (36” X 23.5” X 2.25” ) are assembled using perforated face sheets enclosed in a steel frame on three sides. The forth side frame is welded after filling of adsorbent. The assembly and dimensions as per enclosed drawing and specifications given below:

2. Perforated face Sheet: Mild sheet, 16 gauge thick perforated with 3 mm dia holes at 6 mm triangular pitch with perforated free of overlapping, slippings and any other defect.

3. Sheet Steel Frame: Mild Steel Sheet, 16g thick, bent into U section as per drawing. Fresh quality, free from pitting, corrosion etc.

4. Assembly: The perforated face sheets after insertion in the steel sheet frame are tack welded 100 mm c/c spacing on three sides of frame as shown in the drawing.

5. 8 mm dia holes: After assembly, three nos. of 8 mm holes are drilled in the perforated sheet faces in line at equal distances for inserting 6 mm dia pin.

6. Galvanizing: The assembled tray with top cover frame is coated with zinc 600 g/Sq.m preferably after complete fabrication, otherwise galvanized sheets having 600 g/Sq.m zinc coating are used before assembly.

7. Painting: One coat of epoxy primer and two coats of epoxy grey paint are applied by spray on both sides and inside of tray and on the top cover.

8. Dimensional Tolerances:

i) Tray length : 915 mm (+ 3 mm, - 0 mm)

ii) Tray Width : 597 mm (+ 0 mm, - 3 mm)

iii) Tray Thickness : 57 mm (+ 2 mm, - 0 mm)

iv) Tray Squareness : Difference between diagonals do not exceed 3 mm.

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ANNEXURE-III

SPECIFICATIONS OF ACTIVATED CHARCOAL WITH TEST PROCEDURE

BASE MATERIAL : COCONUT SHELL

ACTIVATION AGENT : STEAM AIR

Sr.

No.

PROCEDURE

DESCRIPTION

REFERENCE

DOCUMENT

ACCEPTANCE

CRITERIA

1. SAMPLING OF ACTIVATED CARBON

IS-877

2. DETERMINATION OF MOISTURE CONTENT IN ACTIVATED CARBON

IS-877 LESS THAN 5%

3. DETERMINATION OF ASH CONTENT ACTIVATED CARBON

IS-877 LESS THAN 5%

4. DETERMINATION OF PARTICLE SIZE IN ACTIVATED CARBON

IS-877 95% MATERIAL SHOULD BE PASSING THROUGH 8 MESH BSS AND RETAINED ON 16 MESH BSS

5. DETERMINATION OF HARDNESS NUMBER IN ACTIVATED CARBON

IS-877 MORE THAN 90

6. DETERMINATION OF CARBON TETRACHLORIDE ADSORBTION IN ACTIVATED CARBON

IS-877 62% (+/- 2%)

7. DETERMINATION OF Ph of ACTIVATED CARBON

IS-877 9 +/- 1

8. DETERMINATION OF IODINE ADSORBTION VALUE OF ACTIVATED CARBON

IS-2752 MORE THAN 10000 mg/gm

9. DETERMINATION OF SURFACE AREA OF ACTIVATED CARBON

IS-2752 1000 Square m/g

10. DETERMINATION OF IGNITION TEMPERATURE OF ACTIVATED CARBON

ASTM-3466 MORE THAN 480 deg. C

11. DETERMINATION OF BULK DENSITY OF ACTIVATED CARBON

IS-1353 0.50 gm/CC (+/- 0.05 gm/CC)

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12. OPTIMISATION OF IMPREGNATION PERCENTAGE IN ACTIVATED CARBON

PROCEDURE No. IF/ CPIF/ 09-10/12/ Rev-0

TO BE OPTIMISED AS PER APPROVED PROCEDURE BUT MAXIMUM IMPREGNATION FOR KI IS 3% AND KOH IS 2%

13. DETERMINATION OF KI IMPREGNATION PERCENTAGE IN ACTIVATED CARBON

PROCEDURE No. IF/ CPIF/ 09-10/13/ Rev-1

OPTIMISED KI % (+/- 0.5%)

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DIVISION-III

ASSEMBLY OF HEPA FILTER WITH CHARCOAL FILTER AND TESTING

PROCEDURE

1.1. The filter assembled as per sketch is to be effectively sealed as all possible junctions of plywood supports, trays, HEPA filter and the filter casing so that no clear passage is available for air to go unfiltered

1.2 All the six trays of each filter are to be packed with the selected and certified impregnated activated charcoal (Ref.: Division-II) to its packing density, so that no voids are left for channelling of air to occur.

1.3 Two nos. of Pt- 100 RTDs ( Ref.: 3.8 above ) are to be incorporated in the middle trays with the help of RTD clamps ( Ref.: 3.9 above ) so that the hot junctions of the RTDs get embedded 25 mm deep in the adsorbent bed and the connecting cables can be taken out easily from the back end.

1.4 The HEPA filter shall not have splices of filter medium and shall not be spot patches to repair holes or cracks.

1.5 The HEPA filter pack shall have a minimum of 140 +/- 5 numbers of pleats, accommodating around 21.5 sq. m ( 230 sq. ft ) of filter medium, as above. The core of the assembled filter pack shall be tight.

1.6 After assembly of Iodine filter, a pretest and qualified HEPA filter is to be integrated with the iodine filter. The pleats and the separators of HEPA filter should be at right angles to the adsorbent trays. The HEPA is to be effectively sealed using adhesive in such a manner that no air passes unfiltered. (Drawing No. NPCIL/Maint./CH&CF/SK-01 )

1.7 Traceability of HEPA filter during integration with Combined HEPA and Charcoal filter shall be established by vendor and reported.

1.8 The sealant shall be uniformly applied and perfectly dry and set at all places.

1.9 Care must be taken during the assembly and handling of the filter that the corners and edges of plywood casing are not damaged. The edges must remain smooth for gasket fixing at site.

1.10 The filter is painted from outside with one coat of epoxy primer and two coats of chemical resistant epoxy grey paint.

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1.11 Two nos. of Face Guards ( Ref.: 3.10 above ) are to be provided on both ends for protection to the filter, properly secured with the help of 12 mm wood screws.

1.12 Both filter faces shall be properly covered with 4-6 mm thick plywood/ hard board pieces of size 648 mm X 648 mm before it is packed in a wooden packing box, as per enclosed drawing no. NPCIL/Maint./CH&CF/SK-05.

1.13 Each filter shall be packed ( with top side up ) tightly in the wooden box, with

25mm thick thermocol sheets all around, for safe delivery. The boxes shall have necessary strapping.

1.14 The serial/ Identification number of the filter packed inside each box shall be clearly indicated on top and sides of the packing box. (Preferably on a sticker). The boxes shall have necessary marking for transporting/ storing the filter horizontally.

2.0 INSPECTIION The inspection and acceptance procedure of the adsorbent shall involve the

following steps: 2.1 Sampling of base charcoal for evaluation of specified properties at suppliers

laboratory to be done as per Procedure No. IF/CPIF/09-10/01 2.2 Determination of exact percentage of impregnation of KI & KOH on the

particular batch is done the supplier as per Procedure No. IF/CPIF/09-10/12 2.3 Inspection of impregnated charcoal for uniform impregnation at suppliers

laboratory is done as per Procedure No. IF/CPIF/09-10/13 3.0 PERFORMANCE EVALUATION :

3.1. Each assembled filter unit shall be individually tested for its performance i.e. pressure drop and removal efficiencies for particulate using DOP ( Di Octyl Pthaphlate ). Iodine-131 and Methyl Iodide respectively in approved test rig, employing test methods as standardized by NPCIL at the rated capacity of 1700 CMH at the supplier works. Test Procedure for combined HEPA and Charcoal filter is given in Annexure-IV. The test results, date of testing, air flow direction and the serial no. of the filter, batch no., month of impregnation of the adsorbent used in the assembly of the filters etc. are to be marked on top side of each filter by marker pen. A copy of sample sticker is attached as Annexure-V.

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3.2 Initial Pressure drop :

Not more than 52 mm WC at the rated capacity of 1700 CMH

3.3 Removal Efficiency :

a) For submicron particulates up 0.3 micron size particle: Not less than 99.97%

b) For Molecular Iodine : Not less than 99.95%

c) For Methyl Iodide : Not less than 99.90%

Notes: Methyle Iodide test is done only for one filter selected from each lot. Above three tests shall be carried out as per procedures approved by NPCIL/BARC

4.0 TERMS AND CONDITIONS:

4.1 Prior inspection and approval of all the materials of construction, procured by the supplier strictly as per our specifications, shall be carried out by the indenter at supplier’s premises before starting the assembly work.

4.2 Stage-wise inspection will be carried out, at the desecration of the department during the progress of the assembly work at supplier’s premises.

4.3 Inspection and testing of individual HEPA filter, as specified above, shall be witnessed by the purchaser’s representative, before integration.

4.4 Rejections, if any, on account of (a) poor workmanship (b) dimensional defects and (c) non-qualifying of functional tests shall be done by the supplier.

4.5 Time is the essence of this contract. Filters delivered after the due date may or may not be acceptance. Even in case of acceptance after the due date, Liquidating Damages as per rules shall be levied.

5.0 SUPPLY OF VARIOUS SAMPLES AND TECHNICAL DETAILS ALONGWITH OFFER

5.1 Supply of Samples with the offer The following samples of the materials of construction must accompany the

offer:

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a) 19 mm thick fire retardant/ resistant plywood sample in 150 mm X 150 mm size.

b) Two sheets of HEPA filter medium in size 300 mm X 300 mm c) Two sheets of Phenolic tissue in size 300 mm X 300 mm d) One sample each of Pt-100 RTD, RTD clamps and gasket strip e) One Kg sample of impregnated activated charcoal

5.2 Supply of Technical Details with the offer :

The following technical details must accompany the offer:

Offer received without the samples of materials of construction and technical details of the facilities available with the supplier shall be ignored.

a) Sketch of the HEPA filter test rig and test procedure.

b) Laboratory facilities available for evaluation of physical and filtration properties of HEPA filter medium.

c) Sketch of the combined HEPA and Charcoal filter test rig and test procedure.

d) Laboratory facilities available for evaluation of physical properties of impregnated

activated charcoal.

6.0 Standard Procedure for packing of combined HEPA and Charcoal filter as mentioned

in Annexure-VI

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ANNEXURE-IV

TEST PROCEDURE FOR COMBINED HEPA AND

CHARCOAL FILTER

Sr.

No.

PROCEDURE

DESCRIPTION

REFERENCE

DOCUMENTS

ALLOWABLE PARAMETERS

1. EVALUATION OF

PERCENTAGE

EFFICIENCY OF

COMBINED HEPA

AND CHARCOAL

FILTER

TECHNOLOGIES

TRANSFERRED

FROM BARC

a. DOP: MINIMUM 99.97%

b. MOLECULAR IODINE:

MINIMUM 99.97%

c. METHYLE IODIDE:

MINIMUM 99.95% ( To be

performed on only one filter

from each lot )

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Sticker for labelling on filter

COMBINED PARTICULATE AND IODINE FILTER

COMPANY NAME:

1. SERIAL NO. CPI/1000/----------------------------------

2. BATCH NO. OF IMPREGNATED ACTIVATED CHARCOAL-------------------

3. MONTH AND YEAR OF IMPREGNATION------------------------------------------

4. PARTICULATE REMOVAL EFFICIENCY ( at 0.3 micron, >99.97)-----------%

5. IODINE REMOVAL EFFICIENCY (>99.95) ---------------------------------------%

6. METHYLE IODIDE REMOVAL EFFICIENCY(>99.90) -------------------------%

7. RATED CAPACITY 1000 CFM ( 1700 CMH )

8. PRESSURE DROP ( <22 mm of WC )----------------------------------- mm of W.C.

9. TESTED ON ( date ) --------------------------,------------

10. TESTED BY ( Name & Sign. ) ----------------------------------------------------------

11. DATE OF INSTALLATION ---------------------------------

12. DUE DATE OF REPLACEMENT ---------------------------------

AIR FLOW

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ANNEXURE-VI

STANDARD PROCEDURE FOR PACKING

Sr.

No.

PROCEDURE DESCRIPTION

REFERENCE DOCUMENT

ALLOWABLE PARAMETERS

1. EVALUATION OF

PERCENTAGE

EFFICIENCY OF

COMBINED HEPA

AND CHARCOAL

FILTER

Procedure No.

IF/CPIF/09-10/19/

Rev-1

TO BE FOLLOWED AS PER

PROCEDURE No. IF/CPIF/09-

10/19/ Rev-1 OR PRIOR

CONSENT TO BE

OBTAINED FROM

INDENTOR/ QA IN CASE OF

VARIATIONS.

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