ML20033C500
| ML20033C500 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 11/25/1981 |
| From: | ROBERT L. CLOUD ASSOCIATES, INC. |
| To: | |
| Shared Package | |
| ML16340C120 | List: |
| References | |
| NUDOCS 8112030326 | |
| Download: ML20033C500 (9) | |
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PROGRESS REPORT
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OF SEISMIC RE-VERIFICATION PROGRAM DIABLO CANYON NUCL'AR POWER PLANT E
4 Project 105-4 Progress Report No. 2 Work Period from 11/11 to'11/23/81 Report of work performed for Pacific Gas &
Electric Co. by R. L. Cloud Associates, Inc.
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Robert L. Cloud Associates, Inc.
j 125 University Ave.
P.O. Box 687 Berkeley, CA 94710 West Falmouth, MA 02574
.(415) 841-9296 (617) 540-5381 l
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9112030326 811 25 PDR ADOCK 050 75 R
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_1 PROGRESS REPORT OF 5
SEISMIC RE-VERIFICATION PROGRAM P
DIABLO CANYON NUCLEAR POWER PLANT 4
Work Period from 11/11 to 11/23/81.
Progress Report No. 2 1.
Summary:
The entire seismic design chain for the Diablo Canyon Nuclear Power Plant was mapped to determine the names, work scope, and status of subcontractors who have been involved with the seismic safety-related work.
A judgment sample has been chosen which consists of more than 90% of the total seismic design work performed by subcontractors in the seismic design chain.
The plan and section drawings developed from as-built auxiliary building drawings are almost completo.
They have been compared with the plan and section drawings used by URS/
Blume to develop the building dynamic model.
Minor differences were disclosed but no conclusion regarding the significance of these differences has been reached.
The dynamic model of one piping run is nearly complete, and a second piping model is being developed.
A total of six systems have been determined from which piping runs will be chosen.
Although efforts have been spent on selecting piping supports for independent requalification, the actual selec-a tion has'not been completed.
The requalification of the selected Boric Acid Tank and the Component Cooling Water Heat Exchanger has begun.
The selection of HVAC ducc supports.is complete, and nineteen of the twenty selected conduit supports have been identified.
A major portion of the conduit and cadle tray-
.I weights based on as-built conditions were computed pnd compared well with the weights used by PGandE. Some re-analysis of work fd'r determining stresses in the conduit also has begun.
The sample for independent requalification of HVAC components has been selecte'd.
However, the selection of small bore piping runs is not complete.
No field trip was taken in this work period to ensure that the as-built configurations of equipment are the'same as were qualified.
This was because of the necessary time required to assemble the design information before a field trip can be taken.
The QA/QC procedures have been enforced.
An internal document control audit was conducted to check the correct implementation of the QA/QC procedures.
2.
Work Accomplished:
There are four tasks of the subject re-verification The work accomplished for each task in the reported program.
work period is described below:
2.1 Task 1 - Review of Sesmic Design Chain for Applicability The entire seismic design chain for the Diablo Canyon i
Nuclear Power Plant was mapped to determine:
names of PGandE's subcontractors involved in seismic l
safety-related work work scope of each subcontractor 4
commencement date and status (closed or.open)_of each.
subcontractor's work ht departments __within PGandE which'were/are responskble for t-
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the subcontracts
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A judgment. sample of the seismic design. chain has been selected and is described below:
EDS (all seismic related work)
EES (piping only)
URS/Blume (piping only)
Wyle Laboratories (sample examination of test
.results)
Westinghouse (electrical equipment, crane only)
Harding-Lawson (soil investigation)
.Anamet (Post Accident Monitor Panel seismic analysis only) 2.2 Task 2 - Independent Re-qualificatior.
The work accomplished for each item in this work period is given below.
2.2.1 Auxiliary Building The dynamic models of the auxiliary building used by URS/Blume for the pre-Hosgri and Hosgri analyses were re-viewed.
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...... _.....,. _ _.. _. _. _ _.-. _.. _ _ _ _,_._.-.._.~.. _._.~.. _ _.__ _.- _..-...__. _.
e The plan and section drawings developed from as-built auxiliary building drawings are almost complete.
Theyhave beencomparedwiththeplanandsectiondrawingsuspdbyURS/
Blume to develop the building dynamic model.
Some dinor dif-
.ferences were disclosed from this comparison.
Although it is beiieved that these minor differences may not affect the overall building dynamic response, the significance can be established only after the mass and stiffness of the dynamic models are compared.
2.2.2 Piping Runs and Pipe Supports A total of six safety-related systems from which some piping runs will be chosen for independent reverification have been determined.
They are:
Safety Injection System Chemical Volume Control System Residual Heat Removal System Containment Spray System Auxiliary Feed Water System Component Cooling Water System The dynamic model of one piping run is nearly complete and a second piping model is being developed.
Because the models are developed from the as-built drawings, a field trip will be necessary to ensure that the as-built configurations are the same as were qualified.
The actual selection of piping cupports is not complete.
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2.2.3 Equipment Some of the relevant design drawings have been reviewed and relevant test reports prepared by the Wyle Laboratories i
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have been obtained.
The requalification of the selected Boric Acid Tank andtheComponentCoolingWaterHeatExchangerhavhbegun smoothly.
2.f.4 Conduit and HVAC Duct Supports The selection of HVAC ducts supports is complete and nineteen of the twenty selected conduit supports have been identified.- A major portion of the conduit and cable tray weights based on as-built conditions were computed and compared
-well with the weights used by PGandE.
Some re-analysis of work for determining stresses in the conduit also has begun.
2.2.5 Small Bore Piping Runs and HVAC Components 1
The sample for independent requalification of HVAC Components has been selected.
However, the selection of small bore piping runs has not been completed.
2.3 Field Verification No field trip took place during this work period.
2.4 QA/QC Procedures The QA/QC procedures have been enforced.
An internal document control audit was conducted to check the correct implementation of the QA/QC procedures.
In only one instance.
was a document removed from the controlled area without be-ing signed out.
This situation has been remedied by circulat-ing a memorandum to all engineers on this project.
3.
Significant Results or Findings No significant results or findings can be reported for the tasks perfoimed in this work period.
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4.
Scheduled Work for Next Work Period 4.1 Task 1-Review of Seismic Design Chain for Applycability i
The review of seismic design chain for the chosen sample
' oE. subcontractors will begin.
4.2 Independent Requalification 4.2.1 Auxiliary Building It is anticipated that the following will be accomplish-ed in the next work period:
Independently developed dynamic models for the auxiliary building Some calculations of mass and stiffness of the dynande models.
Possible field trip to inspect the as-built building configuration 4.2.2 Piping Runs and Pipe Supports The following are planned for the next work period:
A field trip to inspect the as-built piping configura-tions and piping supports.
Development of more dynamic models from chosen systems.
Begin seismic stress analysis of the developed piping dynamic models.
4.2.3 Equipment The following are expected for the next work period:
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Continue to compile and examine information required for re-analyses.
-r-Possible field trip to site to inspect equipmend.and support configurations and compare them with the! drawings.
Some analysis results of equipment requalification.
4.2.4 Conduit and HVAC Duct Supports An independent calculation of the as-built conduit and HVAC duct supports will. continue.
4.2.5 Small Bore Piping Runs And HVAC Components It is anticipated that the following will be accomplished in the next work period:
Review the drawings of selected HVAC Components Make a field trip to inspect the as-built configurations of HVAC components and small bore piping runs.
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Begin independent analysis of HVAC components Select small bore piping runs for independent calculations.
i 4.3 Field Verification i
A field trip is planned to the plant to inspect the auxiliary building and to verify the as-built support condi-tions for the various equipment and piping runs.
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8-4.4 QA/QC Procedures 5
The established QA/QC procedures will-continuddsly be enforced to ensure the quality of engineering wayk.
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Conclusions:==
The emphasis of this w'ork period was on reviewing the gathered design information in order to proceed with the independent requalification of buildings and equipment.
The independent requalification has begun and some analysis results will be reported in the next progress report.
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