ML20034D585
| ML20034D585 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/06/1992 |
| From: | Murphy M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Collins S NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML082410566 | List: |
| References | |
| NUDOCS 9302170346 | |
| Download: ML20034D585 (3) | |
Text
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- g gk NUCLEAR REGULATORY COMMISSION ENCLOSURE 10
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NT -6 IEE MEMORANDUM FOR:
Samuel J. Collins, Director Division of Reactor Safety
" ' I THROUGH:
J. E. Gagliardo, Chief
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Test Programs Section
^V Division of Reactor Safety (
i FROM:
M. E. Murphy, Reactor Inspector Test Programs Section Division'of Reactor Safety
SUBJECT:
Observation of Thermo-Lag Fire Test Assembly Construction at Omega Point Laboratories for TU Electric Fire Tests As requested by Mr. Gagliardo and to provide the oversight requested by Mr. Conrad McCracken in his September 21 memo to Dwight Chamberlain, I visited the Omega Point Laboratories in San Antonio, Texas, on September 29-30, 1992, to observe the in process construction of the fire test assemblies that TU Electric plans to test beginning the last week of October. During the visit, I also discussed with the Task Manager, Mr. Cal Banning, and the Licensing Engineer, Mr. Obade Bhatty, ongoing CPSES site activity and the affect the test assembly construction was having or would have on actual installation practices.
I reviewed the organizational structure and personnel assignments for the fire test project. Mr. Cal Banning, of. IMPEL, is the Task Manager / Coordinator for the project. Mr. Melvin Quick, of Stone and Webster, is a mechanical engineer and provides the engineering support, specifically he is ensuring that inprocess, as built sketches, with information and technique notes are always available. Mr. Chester Pruett, of Fluor Daniel, is providing onsite Quality Assurance for the licensee. Brown and Root personnel from CPSES had already completed the assembly of the cable trays, conduits and supports. They had departed the site. Omega Point Laboratories personnel were installing the cables and thermocouple instrumentation. The Thermo-Lag installation was being accomplished by Peak Seals employees. They had been trained by the licensee, to the licensee's procedures.
Peak Seals is the contractor of record for all Thermo-Lag installations at the CPSES site.
The licensee had identified thirteen fire test assembly configurations for the fire tests. Eleven of these assemblies were confirmed test candidates and two of the configurations were on hold. The eleven active assemblies are identified as follows:
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9302170346 930210 PDR COMMS NRCC CORRESPONDENCE PDR
Samuel J. Collins f-1.
9-1 5, 3, and 3/4 inch conduit w/Jboxes, LBDs and radius bends i
2.
10-1 2 and 3 inch conduit w/Jboxes and LBDs 3.
10-2 2 and 3 inch conduit w/Jboxes and LBDs 4.
13-1 12 inch cable tray 5.
12-2 24 inch cable tray 6.
12-1 30 inch cable tray 7.
14-1 30 inch cable tray w/ tee 8.
11-1 24 inch cable tray w/ airdrop 9.
11-2 24 inch cable tray w/ airdrop
- 10. 11-3 24 inch cable tray w/ airdrop
- 11. 9-3 2, 1 1/2, and 3/4 inch conduits The two assemblies that are on hold are:
9-2 5, 3, and 3/4 inch conduit 10-3 2 and 3 inch conduit w/Jboxes Present plans are to test items 1, 2, and 3 the week of October 26 with the remaining items to be tested in the order of their numerical priority, in groups that comply with the required 30 day cure time requirement.
Item I is a full upgrade of the 3/4 inch conduit with a basic construction and an added 1/4 inch overlay of preformed thermo-lag. All three sizes of Jboxes and LBDs have been upgraded to reinforce the previously identified weak areas of assembly. This will also be the first test of conduit radius bends.
Item 2 will test an upgraded configuration of the J/ boxes and LBDs that adds 1/2 inch of thermo-lag overlay with stress skin reinforced seams.
Item 3 will test the Jboxes and LBDs with stress skin upgrade but without the added thickness of thermo-lag.
Item 4 is an upgrade with selected joint wire stitching and stress skin reinforcing of all joints.
Items 5, 6, and 7 are the same as item 4 but with an added stress skin wraparound at the stitched joints.
Items 8, 9, and 10 will test the protection of the cables in the three air drops from the cable tray to three conduits. The scheme is to provide various numbers of layers of the flexiblanket to the cables in the air drops.
Item 8 will use the scheme of 3, 3, and 2 layers for the respective conduit sizes.
Item 9 will use 4, 4, and 3 layers respectively.
Item 10 will use 3M wrap in piece of the thermo-lag flexiblanket.
Item 11 will test a Unit I upgrade technique.
e 1
Samuel J. Collins At CPSES, installation is continuing in Unit 2 on an "at risk" basis. Changes and/or improvements in installation techniques are passed on to the site from the field project and DCN's are being issued to update the installation procedures. At the time of this review, there was no upgrade work being done on Unit 1.
The licensee is considering limited upgrading in selected areas, based on the results of the tests, during this refueling outage. The planned upgrades would use only the techniques identified as applicable to Unit I and proven satisfactory by the tests. We will be advised of this action should it be initiated.
The basic assembly fabrication was complete for the identified test items.
i Installation of the cables and instrumentation wiring was in process and being conducted under the supervision of the Task Manager and observation of the QA representative. Application of the thermo-lag elements was being performed in accordance with approved procedures that were being continuosly updated to l
insure capture of any technique changes or configuration modifications. The installation was being recorded by in process engineering sketches, still photographs, and video camens. Those fabrications.that-I observed, appeared to be accomplished in a skilled and professional manner.
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. E. Mu ph, eactor Inspector Test Programs Section cc:
i R. Architzel A. Beach S. Black B. Holian P. Madden C. McCracken J. Milhoan J. Montgomery A. Thadani M. Virgilio L. Yandell
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