ML20137J996
| ML20137J996 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/21/1985 |
| From: | Alan Anderson SOUTHWEST RESEARCH INSTITUTE |
| To: | |
| Shared Package | |
| ML17198A292 | List:
|
| References | |
| FOIA-85-59 NUDOCS 8512030090 | |
| Download: ML20137J996 (8) | |
Text
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SOUTHWEST RESEARCH INSTITUTE X-FE-108-1 NUCLEAR PROJECTS Janua n 1985 I
OPERATING PROCEDURE Page 1 of 8 SCIDiIDT HAMMER TEST ON CONCRETE. AT THE COMANCHE PEAK STEAn gECTRIC STATION i
EFFECTIVITY AND APPROVAL 1
of this procedure became effective on 21 Jan 1985. This procedure consists of the pages and Revision chanps listed below.
Page No Change Date Effective 1-8 21 Jan 1985 I
cj3s3 0512030090 851106 PDR FOIA SA G AR DE8 5-59 PDR 6
Aporovals Written By Date Technical Review Date gf gjQ$
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D/te Manager of Q.A.
Date n: Director YA
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x-FE-to8-1 SOUTHWEST RESEARCH INSTITUTE January 1985 NUCLEAR PROJECTS OPERATING PROCEDURE Page 2 of 8 SCHMIDT HAMMER TEST ON CONCRETE AT THE
.l COMANCHE PEAK STEAM ELECTRIC STATION i
1.
PURPOSE This procedure provides the technical information and detailed ' steps to ensure complete and accurate hanner testing on selected concrete areas.
2.
SCOPE AND APPLICATION I
Concrete members to be tested shall be at least 4 inches or 100 milli-meters thick and fixed within a structure. Smaller specimens must be rigidly supported. Areas exhibiting honeycombing, scaling, rough texture, or high porosity should be avoided.
3 Test areas shall be at least 6 inches or 150 millimeters in diameter.
r Examination shall be conducted in accordance with American Standard for Testing Materials C805-79.
3 RESPONSIBILITY.
The Director of the Department of Engineering Services, Quality (1)
Assurance Systems and Engineering Division, shall be responsible for the preparation, review, approval, and control of this procedure.
The Project Manager shall be responsible for the implementation of l
(2) this procedure in accordance with the applicable SwRI Project Plan.
(3)
The examiner shall be responsible for implementing the requirements of this procedure.
The Manager of the Support and Administration Section of the Quality (4)
Assurance Systems and Engineering Division, shall be responsible for storage of records generated in accordance with this procedure.
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Swm Form OA 3.. ~
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SOUTHWEST RESEARCH INSTITUTE x-rE-tos-t January 1985 NUCLEA A PROJECTS OPERATING PROCEDURE Page 3 of 8 l
4.
PERSONNEL AND EQUIPMENT 4.1 Personnel Certification Personnel performing examinations shall be qualified and certified in accordance with SwRI's Nuclear Projects Operating Procedure (NPOP) X-FE-107-0, " Qualification and Certification of Personnel involved in Nuclear Inspection / Testing Projects."
4.2 Concrete Test Hanuner A concrete test hammer (Type N) shall be used when conducting exam-
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inations in accordance with this procedure.
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4.3 Test Anvil A test anvil vill be used to verify the rebound of the concrete test hammer.
NOTE The test anvil is an encased steel block with a core of drill steel. The rebound number is directly related to the hardness of the test anvil which will not change.
ANSI N45.2-1971, Section 13 is not intended to imply a need for a special. calibration and control measures on rulers, tape measures, levels, and such other devices, if normal cousserical practices provide adequate accuracy.
Forney's operating instructions state, "The testing any11 serves to check the proper operation of the test hanumer."
Therefore, the test anvil is not required to be traceable or calibrated to a known standard.
4.4 Thermometer Therscaeters shall be calibrated and certified in accordance with the applicable revision of SwRI Nuclear Project Operating Procedure XII-FM-104.
4.5 Abrasive Stone Abrasive stones shall be used to remove any sof t surfaces or loose mortar.
SwMt Form QA 3 2
SOUTHWEST RESEARCH INSTITUTE x-FE-tos-1 January 1985 NUCLEAR PROJECTS OPERATING PROCEDURE Page 4 of 8 5
O_PERATIONAL INSTRUCTIONS FOR CONCRETE TEST HAMMER Press on' the head of the impact plunger to release plunger out of housing.
l For verification using the test anvil, place the anvil on a solid support j
such as a concrete floor. Place the hammer into the anvil's collar in a vertical down position and push until the hammer is released.
(Note:
Make sure you do not hit the bottom of the collar, instead of the standard metal, since an erroneous reading may be obtained.) Do not touch the push-button before the hammer is released.
For testing on concrete surfaces, place the hammer perpendicular to the surf ace to be tested.
Push until the hammer is released. Do not touch i
the pushbutton before the hammer is released.
After the impact, the hammer mass rebounds by a certain amount which is 4
indicated on the scale.
(1)
Rebound value must be noted before hammer is removed from the test anvil, or concrete surf ace, because by removal the hammer is reset and rebound values will indicate approximately zero. Record the rebound number to two significant figures.
(2)'
Rebound value can be maintained, if necessary, af ter the test, by pressing the pushbutton before the hammer is removed from the test anvil, or concrete surface. Hammer is reset by pressing impact plunger part way into housing and releasing without touching push-button.
Caution: Never touch pushbutton when moving plunger into housing.
6.
ACCURACY VERIFICATION FOR CONCRETE TEST HAMMER l
For accuracy verification of the concrete test hammer, the test anvil shall be used. As a minimum,. the test hammer shall be verified before j
each days use, at lunch time, and af ter each days use.
6.1 verification Test' (1)
Visually inspect the test anvil for any sign of damage.
l (2)
One verification test shall consist of ten (10) rebound values.
I (3)
Using the middle eight readings, determine the average rebound value.
i SwRI Form QA 3 2 j
SOUTHWEST RESEARCH INSTITUTE X-FE-108-1 January 1985 NUCLEAR PROJECTS OPERATING PROCEDURE Page 5 of 8 nw NOTE The rebound value must fall between 78 and 82 inclusive for the Type "N" Hammer.
If rebound values outside these ranges are obtained, the test hammer shall be cleaned and/or adjusted in accordance with Forney's Operating Instructions and then reveri-fied on the test anvil.
Also, the client shall be informed of this occurrence at the earliest opportunity.
6.2 Special Considerations (1)
The temperatures of the rebound hammer itself may affect the rebound number.
(2)
Different hammers of the same nominal design may give rebound numbers differing from 1 to 3 units and, therefore, tests should be made with the same hammer in order to compare results.
If more than one hammer is to be used, a sufficient number of tests must be made on typical concrete surfaces so as to determine the magnitude of the differences -to be expected.
7.
EXAMINATION 7.1 Surface condition Heavily textured, soft, or surfaces with loose mortar shall be ground smoo'th with an abrasive stone. All surfaces will be prepared by first removing a surface layer to a depth of approximately 1/4 inch.
Concrete at 32*F'(0*C) or less may exhibit very high rebound values.
Concrete should be tested only after it has thawed. The concrete must be dry when performing the impact test.
The surface condition of each test area shall be evaluated prior to testing.
If the surface condition of an area is not acceptable, the client shall be notified as soon as possible.
l 7.2 Test One test shall consist of ten (10) rebound values within a test area of at least 6 inches in diameter.
No two impact tests shall be closer together than 1 inch or 25 mm.
Examine the impression made on the surf ace af ter impact and disregard the reading if the impact crushes or breaks through a near-surface ~ air void.
Swm Form OA12
SOUTHWEST RESEARCH INSTITUTE X-FE-108-1 January 1985 NUCLEAR PROJECTS OPERATING PROCEDURE Page 6 of 8
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RECORDING CRITERIA The results of verification tests shall be recorded on the Verification of Concrete Test Hammer on Test Anvil sheet (see Attachment 1).
The results of tests on concrete areas shall be recorded on the Concrete Hammer Test Results sheet (see Attachment 2). All rebound readings shall be recorded.
All verification sheets and test results sheets shall be reviewed by a qualified SwRI representative prior to submittal to the client.
Copies of these sheets shall be provided to the client on a regular basis during the course.of the work.
Discard readings differing from the average of 10 readings by more than 7 units and determine the average of the remaining readings. Remaining rebound values shall be used to determine the mean rebound value to an accuracy of 1/2 scale unit.
If more than 2 readings differ from the aver-age by 7 units discard the entire set of readings.
9.
RECORDS The customer shall receive copies of documents generated in accordance with this procedure.
Original documents generated in accordance with this procedure shall be stored and retained by the Manager of'the Support and Administration Sec-tion, Quality Assurance Systems and Engineering Division.
Swal Form QA 3-2
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X-FE-108-1 January 1985 Page 7 of 8
. ATTACHMENT 1 i
SOUTHWEST RESEARCH INSTITUTE l
VERIFICATION OF CONCRETE TEST HAMMER ON TEST ANVIL Sheet No.
Texas Utilities Generating Co.
Date Comanche Peak Steam Electric Station
-Hammer Serial No.
Data and Time Last Verified Anvil Manufacturer Serial No.
Verification Data Temp. of Hammer Thermometer No.
Time Rebound Values:*
1.
2.
3.
4.
5 6.
7.
- 8. >
9.
10.
Avg. Value With g_Rgnge Yes/No Tes/No Yes/No Yes/No Yes/No
- Circle discarded readings Remarks:
4 Tested by:
Date Revie'wed by:
Date
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X-FE-108-1 January 1985 Page 8 of 8 ATTACHMENT 2 SOUTHWEST RESEARCH INSTITUTE CONCRETE HAMMER TEST RESULTS Sheet No.
Texas Utilities Cenerating Co.
Date Comanche Peak Steam Electric Station Start Time Finish Time Test Hammer Serial No.
Verification Sheet No.
Concrete Pour Package No.
Test Location / Area Identification Direction of Impact:
Horizontal Upward Downward Other Moisture Condition-of Concrete Dry Wet Temperature of Concrete Temperature of Test Hammer Thermometer No.
Rebound Values:*
1.-
2.
3.
4.
5.
6.
Mean Rebound Value 7.
8.
9.
10.
- Circle discarded readings Remarks:
)
Tested by:
Date Reviewed by:
Date
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