TXX-4729, Discusses Procedures Implemented Per 821203 Commitment to IE Bulletin 79-14,requiring Insps of safety-related Piping Sys to Verify That Drawings for Seismic Analysis Accurately Reflect as-built Condition
| ML20155G131 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 04/03/1986 |
| From: | Council W, Counsil W, Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-79-14, TXX-4729, TXX-47294, NUDOCS 8604300149 | |
| Download: ML20155G131 (2) | |
Text
3 Log i TXX-4729 File # 10115.
TEXAS UTILITIES GENERATING COMPANY
' SKYWAY TOWER e 400 NORTH OLIVE STREET, L.B. S1. DALLAS. TEXA8 75301
~ April-3, 1986' T) EI @ F 0*#D, M
.== a.y;,e,
(:
APR -.91986 b J'
Mr. Robert D. Martin J
Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION DOCKET NOS. 50-445 AND 50-446 STATUS OF AS-BUILT-VERIFICATION PROGRAM Ref: TXX-3597 of December 3, 1982
Dear Mr. Martin:
Texas Utilities Letter TXX-3597 dated December 3, 1982 describ'ed the CPSES As-Built-Verification Program initiated in response to~IE Bulletin 79-14.
Specifically, items 2 and 3 of'the bulletin required inspections of safety related piping systems to verify that drawings relied on for seismic analy- )
ses' accurately reflected the as-built condition.
Construction permit holders were required to report the results of these inspections within 120 days. This reporting requirement appeared to be directed toward plants where piping systems were substantially complete.
Since the CPSES piping systems of concern were still under construction at the time the bulletin was issued, the reporting requirement was deemed to be inappropriate.-
Rather, the inspection and verification requirements of the bulletin were incorporated into the appropriate'CPSES' design and construction procedures.
Based on these procedures the reference' letter closed our response to the bulletin.
Implementation of these procedures has been ongoing throughout construction.
of Units 1 and 2.
The Unit 1 program is now complete; the Unit 2 program is continuing. As a result of design verification requirements arising from the CPSES licensing proceedings, TUGCo commissioned Stone and Webster Engineering' Corporation (SWEC) to perform stress requalifications of code piping and pipe supports._ To establish sufficient confidence in the ade-quacy of_ dimensions and functions shown on drawings used in their analyses, SWEC sampled Unit 1_as-built documentation to verify the following attri-butes:
0 Valve location 0 Pipe support location 0 Pipe support function 0 Valve and support orientation
- y 4 ornarou or rsras urrr.rrras srecrmrc couramr 8604300149 860403 1
50
$R ADOCK 0500 5
0 -
4 Withithe exception of discrepanciesHin'the tolerance of.so;e valve.and sup-port. orientations, the review determined that the' remaining attributes were adequate.
TUGCo initiated an inspection of all valve and support-orien-tations, issuing _non-conformances where conditions were f.ound to be outside tolerance limits. Any modifications resulting from the non-conformances or from the SWEC requalification effort will be performed in accordance with.
the CPSES as-built program, which requires tiaat any modifications to piping systems or supports be reconciled with. seismic analyses.
- Very'truly yours,-
AVY
~
W. G. Counsil BSD/ arm c - U.S. Nuclear Regulatory Commission Document Control Desk-j Washington, D.C.
20503 Mr. Vince Noonan 4
i
+
' l
-s-.
m 2
pww 3
c
+
q e--g
-