ML20236N552
| ML20236N552 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/21/1987 |
| From: | Zill R EVALUATION RESEARCH CORP. |
| To: | |
| Shared Package | |
| ML20236N530 | List:
|
| References | |
| CPP-006, CPP-6, NUDOCS 8708120011 | |
| Download: ML20236N552 (11) | |
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CDMANCHE PEAK P.ESPONSE TEAM PROJECT PROCEDURE FOR.QA/QC ISSUE-SPECIFIC ACTION PLANS
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PROCEDURE NO: CPP-006 REVISION: 3 ISSUE DATE: 01-21-87 SAMPLE SELECTION 7
PREPARED BY:
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APPROVED BY: DATE: /-20-77 ON-SITE QA RF{$ESENTATIVE APPROVED BY: DATE: / .72)
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kh QA/QR REVIEW TEAM LEADER /
t 8708120011 870731 .
'CPP-006 Revision: 3 l
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1.0 PURPOSE This procedure describes the method used to randomly select items and related documentation for reinspection / review utilizing established statistica1' techniques required by applicable
-Issue-Specific Action Plans.
2.0 APPLICABILITY
- This procedure is applicable to purchased safety-related equipment and material, as well as safety-related hardware constructed and final QC accepted at Comanche Peak Units 1, 2, and areas common to both units.
3.0 REFERENCES
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L 3.1 CPP-005, " Establishing Populations" (Not applicable to VII.a.9) l 3.2 CPRT Program Plan, Appendix D. "CPRT Sampling Approach, Applications, and Guidelines."
3.3 CPP-012, "QA/QC Interface with Constructor and TUGCO."
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\ 3.4 CPP-008, " Preparation of Verification Packages" (Not applicable to VII.a.9) 3.5 CPP-027, " Reinspection / Documentation Review of Purchased Safety-Related Material and Equipment" (Applicable to VII.a 9 only) 4.0 GENERAL Random samples of complete safety-related construction activities and/or QC documentation will'be reinspected and/or reviewed in order to establish, at a minimum, a 95 percent confidence level that 95 percent of.the population complies with the acceptance criteria.
The first sample provides'information about the total population.
As required by Issue Specific Action Plan (ISAP) VII.c, a second sample provides additional information about a portion of the total population that is required for safe shutdown.
NOTE: A second random sample, as defined in this procedure, is'not required by ISAPs VII.a'and VII.b.
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CPP-006 Revisien: 3 4.1 responsibilities 4.1.1 All ISAPs Except VII.a.9 4.1.1.1 QA/QC Discipline Engineers / Issue Coordinators The QA/QC Discipline Engineers / Issue Coordinators select the random samples and prepare the Random Sample Identification List.
4.1.1.2 QA/QC Lead Discipline Engineers / Hardware Issues Supervisor
' The QA/QC Lead Discipline Engineers / Hardware Issues Supervisor review and approve Random Sample Identification Liets.
Moreover, the QA/QC Lead Discipline Enginears/ Hardware Issues Coc.rdinator ensure the distribution of approved Random Sample Identification Lists to the required personnel.
4.1.1.3 QA/QC Inspectore, QA/QC Inspectors assist in the process of j
determining the (in) accessibility of the randomly selected items and initiate Requests for Equipment / Services as required.
4.1.2 ITAP VII.a.9 4.1.2.1 QOC Deputy Program Manage;r_
The QOC Deputy Program Manager establishes criteria for use of random sampling and approves sampling plans for identified i
homogeneous populations, 4.1.2.2 Issue coordinator I
" The Issue Coordinator reviews proposed random sampling plans and their implementation.
4.1.2.3 QA/QC Discipline Engir.eers propose and implement random sampling plans for homogeneous population inspections.
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CPP-006 e
Revision: 3 4.2 Policy
't,_) . Activities performed under this procedure shall conform to the policies contained in the latest Comanche Peak Response Team Program Plan, ERC Management Program Plan, and the applicable Issue-Specific Action Plan (s).
Where ar vity is designated as the responsibility of a QA/QC Lead Discipline Engineer / Hardware Issue Supervisor / Issue Coordinator /QOC Deputy Program Manager, or higher, it may be delegated by that individual to an individual under his or her supe rvision.
4.3 Conflicts In the case of a conflict between this procedure and the-documents referenced in Section 4.2, the latter shall govern. ;
4.4 Definitions 4.4.1 .First Random Sample - A selection of population items or work activities in which each item in the population has an equal chance of being selected.
4.4.2 Second Random Sample - A selection of population items or work activities from the safe shutdown systems or, for populations such as concrete whien do not directly
' contain items in the safe shutdown systems, a selection of items or work activities which support those systems, or are in locations where their failure could adversely impact those systems.
4.4.3 Accessible Sample' Item - An item which can be reinspected without. invalidating any previously installed.and accepted work. Accessible items may include those items for which scaffolding must be erected. It does not include those items which must be disassembled, such as valve and piping internals and items embedded in concrete. j l
5.0 PROCEDURE 5.1 Random Sample Selection Upon completion of the Population Items List in accordance with Reference 3.1 (not applicable for ISAP VII.a.9), the QA/QC Discipline Enginee.rs select random samples as follows. l In addition Issue Coordinators select random samples, as required, in accordance with this procedure.
5.1.1 Assign a sequer.tial number, beginning with one, to each f'~ item in the population. (This may be accomplished by
( vriting the numbers on a copy of the approved Population Item List.)
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a CPP-006 Revision: 3 5.1.2 Discount the number of items in the population which
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(_/ are unrelated to safety, incomplete, and/or unaccepted by QC, The r. umber of remaining items is the estimated population size.
5.1.3 Use Table 5.1-1 to determine the minimum sample size for a 95/5 screen. Reference 3.2 establishes minimum sample sizes for other screens (e.g. , 95/2.5 and 95/1).
NOTE: Select more than the minimum number of sample items in the event some are determined later to be inaccessible.
TABLE 5.1-1 SAMPLE SIZE FOR POPULATIONS (95/5 Screen) l MINIMUM RANDOM POPULATION SIZE SAMPLE SIZE
- 01-45 all 46-100 45
,~7s 101-or more 60 I ")
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5.1.4 Select the particular table of random digits in accordance with instructions in "A Million Random Digits,"** then place a decimal point in front of each set of random digits and multiply it by the population size. Use 5 random digits for populations comprised of 10,000 items or less. Otherwise, use 10 random digits.
5.1.5 Drop the ' decimal portion of the product and add one.
The resultant random number will be the same as the previously assigned sequential number of an item (refer to Paragraph 5.1.1), thereby randomly selecting the item.
Example: Generate a sample of 60 items from a population of size 900.
If a second random sample is required (refer to Section 5.2), l include those items from the first randomly selected sample that l are required for safe shutdown.
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CPP-006-Revision: 3 Sample? Random ' Population Random Number Digits Size Number 1' = . 04146- xL 900 = 37.314 =- '37 + 1 = 38 2- = .23432 x' '900 = 210.888 =:210-+ 1 =- 211 3 = .74381' x 900 - 669.429 = 669 + 1'= 670 75 = .65339 x 900 =
588.051 = 588 + 1 = 589 5.1.6 Confirm that each randomly selected item is complete.
1.e. , incorporates all changes, is- QC accepted, and is accessible.
NOTE: QA/QC. Inspectors assist in the process to determine the (in) accessibility of the randomly selected items.- When equipment and/or services are required, e.g.,
O- scaffolds, lights, etc., in order to perform reinspection, Inspectors initiate Requests
.for Equipment / Services in accordance with Reference 3.3 5.1.7 Should an item not meet the criteria in Paragraph 5.1.6, the next random number is generated and another item is selected.
5.2 Second Random' Sample As required by ISAP VII.c, a second random sample will'be selected from that portion of the population characterized as being required for safe shutdown.
- "A Million Random Digits," Rand Corporation, page 355.
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CPP-006 Revision: 3 a- Items identified in the first random sample that are required
-g< for safe shutdown shall be included in the second random y sample.
The QA/QC Discipline Engineers / Issue Coordinators select the l
second random sample according to the procedure in Section 5.1, except they also determine whether the randomly selected item is or is not within any system identified in the Final Safety Analysis Report (Section 7.4) as being required for safe' shutdown and identified in Table 5.2-1.
l TABLE 5.2-1 f-l- SYSTEMS REQUIRED FOR SAFE SHUTDOWN 1
Auxiliary Feedwater System (AFWS)
Atmospheric Steam Relief Valves (PORV's)
Chemical and Volume Control System (CVCS) l Reridual Heat Removal System (RHRS)
Pressurizer Pressure Control During RCS Depressurization Station Service Water System (SSWS)
Component Cooling Water System (CCWS)
Onsite Power . Systems (Diesels, D. C.)
Control Room Ventilation System i])
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ESF Ventilation System
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Safety Chilled Water System UPS Ventilation System Monitoring Indicators in the St. Gen., RCS, Cond. Stor.
Tank, Soric Acid Tank 5.? Random Sample Idetitification List (Not applicable for ISAP VII.a.9) l 5.3.1 Preparati'n,o Review, and Approva1, The QA/QC Discipline Engineers / Issue Coordinators document the selection of the random samples by ccmpleting the Random Sample Identification List in accordance with Attachment 6.1.
Subsequently, the QA/QC Lead Discipline Engineer / Hardware Issues Supervisor reviews and approves complete Random Sample Identification Lists in accordance with Attachment 6.1.
5.3.2 Distribution and Control The QA/QC Lead Discipline Engineer / Hardware Issues Supervisor ensures that approved Random Sample Identification Lists are distributed to the:
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'CPP-006-Revision: 3 O
QA/QC Records Administrator (File Location-
[ISAP Number]-4).
QA/QC Reinspection Engineering Supervisor.
5.4 Random Sampling Documentation (ISAP VII.a.9 only) 5.4.1 Where homogeneous populations greater than 500 are identified within a. verification package, the QA/QC Discipline Engineer may. propose a random sampling plan in-lieu of complete reinspection of the entire population.
5.4.2 Approved sampling plans are documented by inclusion in the verification package exceptions memorandum.
5.4.3 Random sampling data sheets and selection records are filed in the VII.a.9 Project File according to verification package number.
6.0 ATTACHMENTS 6.1 Random Sample Identification List Form (Sample and Instruction) (Not applicable for ISAP VII.a.9)- l O
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3 Attechment 6.1
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V RANDOM SAMPLE IDENTIFICATION LIST COMANCHE PEAK RESPONSE TEN 1 (1) RANDOM SAMPLE IDENTIFICATION POPULATION NAME: _
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PREPARED BY: (3) _ DATE: (3) r}A/0C DISCIPLINE ENGINEER n DESCRIPTION EM ACCESS
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(4) (5) (6) (7) (8) (9) (10)
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I AFPROVED Bi: (11) DATE: (11)
QA/QC LEAD DISCIPLINE ENGlhEER l O CPP-006.1, Revision 1
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Attachmant 6.1 CPP-006 Revision: 3
- ' INSTRUCTIONS TO COMPLETE FORM CPP-006.1
" RANDOM SAMPLE IDENTIFICATION LIST" The Preparer enters:
(1) "First" or "Second" as applicable.
(2) The population name.
(3) Name as preparer and date.
(4) The sample number of the item, e.g., 1,2,3, etc.
(5) The corresponding random number of each item which comprises the sample as established in Section 5.1.
NOTE: For second random samples, determine whether the !
randomly selected. item is or is not required for safe shutdown (refer to Section 5.2). Include each item which is required for safe shutdown and determined to be in the first randomly selected sample. In order to attain the required sample size (refer to Table 5.1-1), list additional items i
,s i in the same population required for safe shutdown
'# and discount any other item. Continue to list /
discount items until the necessary sample size is established.
(6) The appropriate description of each randomly selected item.
(7) "Y" (Yes) or "N" (No) to indicate wh' ether the randomly selected item is safety related, constructed, and QC. accepted. 4 (8) "Y" (Yes) or "N" (No) after verifying, by examination, that the randomly selected item is (in) accessible.
NOTE: When verification of accessibility is not performed, enter "N/A" (not applicable) and provide justification for not performing the verification in the comments portion of the form. -
(9) As applicable, the Verification Package number (refer to Reference 3.4). Otherwise enter "N/A" to indicate not applicable.
(10) Justification when "N" or "N/A" is indicated, e.g., the item is embedded in...., etc. In addition, summarize the basis and the results of the accessibility review.
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- c1 Attachment 6.1 u, .CPP-006 i' Revision: 3-The QA/QC Lead Discipline Engineer / Hardware Issues Supervisor reviews
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Random Sample Identification Lists to ensure that'they are complete,
',\ accurate, provide clear and' reasonable justification as required,' and are'otherwise consistent'with the requirements of-this procedure. Upon the completion of a satisfactory review, the reviewer:
(11) Signs and dates the form.
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