ML20210C077
| ML20210C077 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/17/1986 |
| From: | Rivard J TELEDYNE ENGINEERING SERVICES |
| To: | TELEDYNE ENGINEERING SERVICES |
| Shared Package | |
| ML20209E570 | List:
|
| References | |
| FOIA-86-657 6410-49, NUDOCS 8602250142 | |
| Download: ML20210C077 (3) | |
Text
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l-M TELEDffE.
NSENICES TRIP REPORT NO. 2200 PROJECT 6410T HVAC HANGER PROGRAM AUDIT COMANCHE PEAK FRIDAY, JANUARY 17,1986 Atttendees:
L. Shao - NRC R. Camp - TUGC0
- 0. Jeng - NRC J. J. Rivard - TES T. Westerman - NRC S. F. Superson - TES C. Hoffman - Brookhaven V. Ferrarint - EAS J. Streeter - TUGC0 The' purpose of this audit was to determine the status of the HVAC sup-ports at Comanche Peak. Mr. John Streeter of TUGC0 gave an overview of the current status of the Unit I HVAC supports.
The following is a brief history of events in this area.
The.NRC Construction Assessment Team (CAT) performed field inspections of the Comanche Peak HVAC supports during January, February and March of 1983.
During this inspection, welds were inspected on fourteen supports, and nine additional supports were inspected for proper location, configura-tion, conformance to drawing.. design and procedural requirements.
At this time deviations were noted in 45 percent of the welds inspected, while five of the nine supports reviewed for dimensions had deviations.
Due to the findings of the CAT audit of the HVAC supports TUGC0 issued a stop-work notice for all Bahnsan Service Company's (Bahnsan installed the HVAC supports) structural welding on March 3,1983.
TUGC0 also began what resulted in a four-phase review of'the HVAC supports.
Phase ! (3/83) consisted of a walkdown by Bahnsan of 104 random supports.
Welds and member dimensions were looked at.
Bahnsan reported a number of deviations with both welds and dimensions.
This as-built infor-mation was transmitted to Corporate Consulting Limited (CCL).
(CCL analyzed the HVAC. ducts and supports.)
CCL found that all the deviations were not safety significant.
CCL did coment that all the supports Fb.EN -S G - & f l N
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No. 2200 NSBMCES reviewed had relatively low weld and member stresses and suggested that the review be expanded to include supp' orts with larger stresses.
This resulted in Phase !!.
Phase !! (3/83) consisted of a review (no field walkdown) of all I
supports with weld stresses greater than one-half the SSE allowable (14.000 psi).
A total of 240 duct su'pports were identified.
It was assumed that the welds of these supports were one-half 'the size and three-quarters the length of that shown on the design drawings.
These reduced weld sizes were based on weld deviations found in Phase !.
An analysis based en the assumed welds indicated that three of the supports had stresses above the appropriate allowables.
However, an analysis of the as-butit condition of these three supports indicated stresses below the allowables.
Due to the results of Phase I and !!, the stop-work order was lifted at the end of April 1983 and work continued.
Phase !!! was conducted in June 1983.
This phase consisted of a com-plete field review of 285 supports.
Included in this group were the 180 accessible supports in Phase !! and 100 additional supports with weld stresses between 9,000 psi and 14,000 psi.
This revie'w consisted of Bahnsan performing the as-builts of the supports and sending this as-built information to CCL for an as-boilt analysis.
All supports were found to be acceptable by CCL.
1 Phase IV performed in July 1983 consisted of a detailed review by CCL j
of the analysis of the Phase !! supports noted as being inaccessible.
Since these supports were inaccessible CCL used a statistical approach for their evaluation and found these supports to be acceptable.
In addition to the four-phase review by TUGC0 (Bahnsan and CCL),
Evaluation Research Corportion (ERC) is inspecting HVAC supports as part of the Construction Adequacy Plan.
ERC has reviewed 68 supports on Unit I i
noting 202 deviations.
The deviations include welding, support configura-tion, and duct-to-support attachment.
There were no details of these attribute deviations.
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In order to complete the Setsmic Qualification Report for the HVAC ducts and supports, Bahnsan is required to send CCL an as-built of the HVAC supports to be analyzed by CCL.
Preliminary results of the as-built anal-ysts for approximately 500 supports include the following deviations.
I Based on analysts, between 50 and 60 of the supports reviewed should have the HVAC duct attached to the suppqrt.
However, the design drawing contains no detail for the attachment.
Of the 50 to 60 supports requiring duct-to-support attachments, 10 have no attachments.
The remaining 40 plus do have an attach-ment in the field.
There is no design detail for the attachment of the duct to sup-port which is required by analysis.
There is no analysis for four supports in the Reactor Building.
Five supports have member-dimension deviations.
CCL did not receive all of the Bahnsan design changes.
This as-butit support analysts began in January 1985, and the project j
has not yet determined the full. impact of these deviations.
However, due to these findings, the status of CPSES Seismic Qualtf tcation Report of l
Seismic Category I Duct Work and Hangers was previously changed from
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" Approved" to "Not Approved" on January 21, 1986.
GJ D f James 4. M vard Y Y.
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j 1 - S. F. Superson (TES l
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